20-F

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 20-F

(Mark One)

☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2021

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of event requiring this shell company report                     

For the transition period from                      to                     

Commission file number 001-15128

United Microelectronics Corporation

(Exact name of Registrant as specified in its charter)

N/A

(Translation of Registrant’s name into English)

Taiwan, Republic of China

(Jurisdiction of incorporation or organization)

No. 3 Li-Hsin Road II, Hsinchu Science Park,

Hsinchu City, Taiwan, Republic of China

(Address of principal executive offices)

Chitung Liu, Senior Vice President & Chief Financial Officer

Telephone: +886-2-2658-9168 / Email: ir@umc.com

8F, No. 68, Section 1, Neihu Road., Taipei 11493, Taiwan R.O.C.

(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)

Securities registered or to be registered pursuant to Section 12(b) of the Act.

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
American Depositary Shares, each representing 5 Common Shares	UMC	New York Stock Exchange

Securities registered or to be registered pursuant to Section 12(g) of the Act.

None

(Title of Class)

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act.

None

(Title of Class)

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report.

12,483,247,566 Common Shares of Registrant issued and outstanding as of December 31, 2021

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.     Yes  ☒    No  ☐

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.     Yes  ☐     No  ☒

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes  ☒     No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or an emerging growth company. See definition of “large accelerated filer, ” “accelerated filer,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Emerging growth company	☐

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act.  ☐

† The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.  ☒

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

U.S. GAAP  ☐ International Financial Reporting Standards as issued by the International Accounting Standards Board  ☒ Other  ☐

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.     Item 17  ☐     Item 18  ☐

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Securities Exchange Act of 1934).     Yes  ☐     No  ☒

UNITED MICROELECTRONICS CORPORATION

FORM 20-F ANNUAL REPORT

FISCAL YEAR ENDED DECEMBER 31, 2021

Table of Contents

		Page
SUPPLEMENTAL INFORMATION			1
FORWARD-LOOKING STATEMENTS IN THIS ANNUAL REPORT MAY NOT BE REALIZED			1
PART I.			4
ITEM 1	IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS		4
ITEM 2	OFFER STATISTICS AND EXPECTED TIMETABLE		4
ITEM 3	KEY INFORMATION		4
ITEM 4	INFORMATION ON THE COMPANY		19
ITEM 4A.	UNRESOLVED STAFF COMMENTS		37
ITEM 5	OPERATING AND FINANCIAL REVIEW AND PROSPECTS		38
ITEM 6	DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES		47
ITEM 7	MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS		51
ITEM 8	FINANCIAL INFORMATION		51
ITEM 9	THE OFFER AND LISTING		53
ITEM 10	ADDITIONAL INFORMATION		54
ITEM 11	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK		72
ITEM 12	DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES		75
PART II.			77
ITEM 13	DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES		77
ITEM 14	MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS		77
ITEM 15	CONTROLS AND PROCEDURES		77
ITEM 16A.	AUDIT COMMITTEE FINANCIAL EXPERT		80
ITEM 16B.	CODE OF ETHICS		80
ITEM 16C.	PRINCIPAL ACCOUNTANT FEES AND SERVICES		80
ITEM 16D.	EXEMPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES		81
ITEM 16E.	PURCHASE OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED PURCHASERS		81
ITEM 16F.	CHANGE IN REGISTRANT’S CERTIFYING ACCOUNTANT		81
ITEM 16G.	CORPORATE GOVERNANCE		81
ITEM 16H.	MINE SAFETY DISCLOSURE		82
PART III.			83
ITEM 17	FINANCIAL STATEMENTS		83
ITEM 18	FINANCIAL STATEMENTS		83
ITEM 19	EXHIBITS		84

i

SUPPLEMENTAL INFORMATION

The references to “United Microelectronics”, “we”, “us”, “our”, “our company” and “the Company” in this Annual Report refer to United Microelectronics Corporation and its consolidated subsidiaries, unless the context suggests otherwise. The references to “Taiwan” and “R.O.C.” refer to Taiwan, Republic of China. The references to “China” and “PRC” refer to People’s Republic of China. The references to “shares” and “common shares” refer to our common shares, par value NT$10 per share, and “ADSs” refer to our American Depositary Shares, each representing five common shares. The ADSs are issued under the Deposit Agreement, dated as of October 21, 2009, as amended, supplemented or modified from time to time, among United Microelectronics, JPMorgan Chase Bank, N.A. and the holders and beneficial owners from time to time of American Depositary Receipts issued thereunder. The references to “TIFRSs” refer to the Taiwan International Financial Reporting Standards as issued by the Financial Supervisory Commission in the Republic of China, “IFRSs” refer to International Financial Reporting Standards as issued by the International Accounting Standards Board, or IASB, and “U.S. GAAP” refer to the generally accepted accounting principles in the United States. Any discrepancies in any table between totals and sums of the amounts listed are due to rounding.

We publish our financial statements in New Taiwan dollars, the lawful currency of the R.O.C. In this Annual Report, “NT$” and “NT dollars” mean New Taiwan dollars, “$”, “US$” and “U.S. dollars” mean United States dollars, “¥” means Japanese Yen, “RMB¥” means Renminbi, “SGD” means Singapore Dollar and “€” means EURO.

FORWARD-LOOKING STATEMENTS IN THIS ANNUAL REPORT MAY NOT BE REALIZED

Our disclosure and analysis in this Annual Report contain or incorporate by reference some forward-looking statements. We have based these forward-looking statements on our current expectations and projections about future events. Although we believe that these expectations and projections are reasonable, such forward-looking statements are inherently subject to risks, uncertainties and assumptions about us, including, among other things:

• our dependence on frequent introduction of new product services and technologies based on the latest developments;

• the intensely competitive semiconductor, communications, consumer electronics and computer industries and markets;

• risks associated with our international business activities;

• our dependence on key personnel;

• general economic and political conditions, including those related to the semiconductor, communications, consumer electronics and computer industries;

• natural disasters, such as earthquakes and droughts, which are beyond our control;

• possible disruptions in commercial activities caused by natural and human-induced disasters, and outbreaks of contagious diseases such as the COVID-19 pandemic;

• fluctuations in foreign currency exchange rates;

• additional disclosures we make in our previous and future Form 20-F annual reports and Form 6-K periodic reports to the U.S. Securities and Exchange Commission, or the U.S. SEC; and

• those other risks identified in the “Item 3. Key Information—D. Risk Factors” section of this Annual Report.

You can identify forward looking statements by the fact that they do not relate strictly to historical or current facts. The words “may”, “will”, “is/are likely to”, “anticipate”, “believe”, “estimate”, “expect”, “intend”, “plan” and similar expressions are intended to identify a number of these forward-looking statements. Forward-looking statements in this Form 20-F include, but are not limited to, statements regarding our business strategies and future plans, anticipated business condition and financial results, our capital expenditure plans, our capacity management plans, expectations as to the capabilities of our technologies and manufacturing process, technological upgrades, investment in research and development, future market demand, regulatory or other developments in our industry, business expansion plans or new investments as well as business acquisitions and financing plans. Please see “Item 3. Key Information—D. Risk Factors” for a further discussion of certain factors that may cause actual results to differ materially from those indicated by our forward-looking statements. We do not and will not undertake the obligation to update or revise any forward-looking statements contained in this Annual Report whether as a result of new information, future events or otherwise. In light of these risks, uncertainties and assumptions, the forward-looking events discussed in this Annual Report might not occur and our actual results could differ materially from those anticipated in these forward-looking statements.

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GLOSSARY

AMS	Analog/mixed-signal.
ASIC	Application Specific Integrated Circuit. A custom-designed integrated circuit that performs specific functions which would otherwise require a number of off-the-shelf integrated circuits to perform.
BCD	Bipolar-Complementary Metal Oxide Semiconductor (“CMOS”)-Double Diffused Metal Oxide Semiconductor (“DMOS”). An integrated circuit and one of the most important components for power management integration circuits.
BSI-CSI	Back-Side Illuminated CMOS Image Sensor, which is recently used for mobile product image sensor with better performance and thinner chip.
Cell	Semiconductor structure in an electrical state, which can store a bit of information, mainly used as the building block of memory array.
Die	A piece of a semiconductor wafer containing the circuitry of an unpackaged single chip.
DRAM	Dynamic Random Access Memory. A type of volatile memory product that is used in electronic systems to store data and program instructions. It is the most common type of RAM and must be refreshed with electricity hundreds of times per second or else it will fade away.
eFlash	Embedded Flash Nonvolatile Memory. Used for most SoC (“System-on-Chip”) applications and has faster speed and enhanced security.
eHV	Embedded High Voltage Device. Used for Liquid Crystal Display (“LCD”) driver circuit to drive LCD devices.
FinFET	Fin Field-Effect Transistor.
FPGA	Field Programmable Gate Array. A programmable integrated circuit.
Integrated Circuit	Entire electronic circuit built on a single piece of solid substrate and enclosed in a small package. The package is equipped with leads needed to electrically integrate the integrated circuit with a larger electronic system. Monolithic and hybrid integrated circuits are distinguished by the type of substrate used.
Interconnect	The conductive path made from copper or aluminum that is required to achieve connection from one circuit element to the other circuit elements within a circuit.
Mask or Photomask	A piece of glass on which an integrated circuit circuitry design is laid out.
MCU	Microcontroller unit, a small computer on a single integrated circuit, containing one or more central processing units along with memory and programmable input/output peripherals.
Memory	A group of integrated circuits that a computer uses to store data and programs, such as ROM, RAM, DRAM and SRAM.
Micron	A unit of spatial measurement that is one-millionth of a meter.
MRAM	Magnetic Random Access Memory.
Nanometer	A unit of spatial measurement that is one-billionth of a meter.
PC	Personal computer.
RAM	Random Access Memory. A type of volatile memory forming the main memory of a computer where applications and files are run.
ReRAM	Resistive Random Access Memory.
RF-SOI	Radio Frequency Silicon on Insulator.
ROM	Read-Only Memory. Memory that is programmed by the manufacturer and cannot be changed. Typically, ROM is used to provide start-up data when a computer is first turned on.
Scanner	A photolithography tool used in the production of semiconductor devices. This camera-like step-and-scan tool projects the image of a circuit from a master image onto a photosensitized silicon wafer.

2

Semiconductor	A material with electrical conducting properties in between those of metals and insulators. Essentially, semiconductors transmit electricity only under certain circumstances, such as when given a positive or negative electric charge. Therefore, a semiconductor’s ability to conduct can be turned on or off by manipulating those charges and this allows the semiconductor to act as an electric switch. The most common semiconductor material is silicon, used as the base of most semiconductor chips today because it is relatively inexpensive and easy to create.
SoC	System-on-Chip. A chip that incorporates functions currently performed by several chips on a cost effective basis.
SOI	Silicon-On-Insulator. Silicon wafer consisting of a thin layer of oxide, on top of which semiconductor devices are built.
SRAM	Static Random Access Memory. A type of volatile memory product that is used in electronic systems to store data and program instructions. Unlike the more common DRAM, it does not need to be refreshed.
Transistor	Tri-terminal semiconductor device in which input signal (voltage or current depending on the type of transistor) controls output current. An individual circuit that can amplify or switch electric current. This is the building block of all integrated circuits.
Volatile memory	Memory products which lose their data content when the power supply is switched off.
Wafer	Thin, round, flat piece of silicon that is the base of most integrated circuits.
8-inch wafer equivalents	Standard unit describing the equivalent amount of 8-inch wafers produced after conversion, used to quantify levels of wafer production for purposes of comparison. Figures of 8-inch wafer equivalents are derived by converting the number of wafers of all dimensions (e.g., 6-inch, 8-inch and 12-inch) into their equivalent figures for 8-inch wafers. 100 6-inch wafers are equivalent to 56.25 8-inch wafers. 100 12-inch wafers are equivalent to 225 8-inch wafers.

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PART I.

ITEM 1 IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS

Not applicable.

ITEM 2 OFFER STATISTICS AND EXPECTED TIMETABLE

Not applicable.

ITEM 3 KEY INFORMATION

A. [RESERVED]

B. Capitalization and Indebtedness

Not applicable.

C. Reasons for the Offer and Use of Proceeds

Not applicable.

D. Risk Factors

Our business and operations are subject to various risks, many of which are beyond our control. If any of the risks described below actually occurs, our business, financial condition or results of operations could be seriously harmed.

Risks Related to Our Business and Financial Condition

Any global systemic political, economic and financial crisis could negatively affect our business, results of operations, and financial condition.

In recent times, several major systemic economic and financial crises negatively affected global business, banking and financial sectors, including the semiconductor industry and markets. These types of crises cause turmoil in global markets that often result in declines in electronic products sales from which we generate our income through our goods and services. In addition, these crises may cause a number of indirect effects such as undermining the ability of our customers to remain competitive when faced with the financial and economic challenges created by adverse political and macro-economic conditions and companies struggling to survive in the wake of these crises. For example, there could be in the future knock-on effects from these types of crises on our business, including significant reduction in orders from our customers; insolvency of key suppliers resulting in product delays; inability of customers to obtain credit to finance purchases of our products; customer insolvencies and bankruptcies; and counterparty failures negatively impacting our treasury operations. Any future systemic political, economic or financial crises could cause revenues for the semiconductor industry as a whole to decline dramatically, and if the economic conditions or financial condition of our customers were to deteriorate, additional accounting related allowances may be required in the future and such additional allowances could increase our operating expenses and therefore reduce our operating income and net income. Any disruption in global trade conditions such as the increase in tariffs or the escalation of regional trade tension will indirectly impact global business environment which may adversely impact our business, results of operations and financial condition.

The seasonality and cyclical nature of the semiconductor industry and periodic overcapacity make us particularly vulnerable to significant and sometimes prolonged economic downturns.

The semiconductor industry has historically been highly cyclical and, at various times, has experienced significant downturns. Since most of our customers operate in semiconductor-related industries, variations in order levels from our customers can result in volatility in our revenues and earnings. Because our business is, and will continue to be, largely dependent on the requirements of semiconductor companies for our services, downturns in the semiconductor industry will lead to reduced demand for our services.

Our operating revenues are also typically affected by seasonal variations in market conditions that contribute to the fluctuations of the average selling price of semiconductor services and products. The seasonal sales trends for semiconductor services and products closely mirror those for consumer electronics, communication and computer sales. We generally experience seasonal lows in the demand for semiconductor services and products during the first half of the year, primarily as a result of inventory correction by our customers. Any change in the general seasonal variations, which we cannot anticipate, may result in materially adverse effects on our revenues, operations and businesses.

4

Our operating results fluctuate from quarter to quarter, which makes it difficult to predict our future performance.

Our revenues, expenses and results of operations have varied significantly in the past and may fluctuate significantly from quarter to quarter in the future due to a number of factors, many of which are beyond our control. Our business and operations have at times in the past been negatively affected by, and are expected to continue to be subject to the risk of the following factors:

• the seasonality and cyclical nature of both the semiconductor industry and the markets served by our customers;

• our customers’ adjustments in their inventory;

• the loss of a key customer or the postponement of orders from a key customer;

• the rescheduling and cancellation of large orders;

• our ability to obtain equipment, raw materials, electricity, water and other required utilities on a timely and economic basis;

• COVID-19 pandemic and outbreaks of other contagious diseases, including but not limited to severe acute respiratory syndrome, avian flu, swine flu and Zika virus;

• regulatory development and changes affecting our business operations globally;

• global and regional geopolitical conditions, including arms conflicts and wars;

• environmental events, such as fires and earthquakes, or industrial accidents; and

• technological changes.

Due to the factors noted above and other risks discussed in this section, many of which are beyond our control, you should not rely on quarter-to-quarter comparisons to predict our future performance. Unfavorable changes in any of the above factors may seriously harm our business, financial condition and results of operations. In addition, our operating results may be below the expectations of public market analysts and investors in some future periods. In this event, the price of the common shares or ADSs may underperform or fall.

A decrease in demand for or selling prices of communication devices, consumer electronics and computer goods may decrease the demand for our services and reduce our margins.

Our customers generally use the semiconductors produced in our fabs in a wide variety of applications. We derive a significant percentage of our operating revenues from customers who use our manufacturing services to make semiconductors for communication devices, consumer electronics, PCs and other computers. The semiconductor industry experienced several downturns due to recent major financial crises and natural disasters. These downturns resulted in a reduced demand for our services and hence decreased our revenues and earnings. Any significant decrease in the demand for communication devices, consumer electronics, PCs or other computers may further decrease the demand for our services. In addition, if the average selling price of communication devices, consumer electronics, PCs or other computers decline significantly, we will be pressured to further reduce our selling prices, which may reduce our revenues and, therefore, reduce our margins significantly. As demonstrated by downturns in demand for high technology products in the past, market conditions can change rapidly, without apparent warning or advance notice. In such instances, our customers will experience inventory buildup and/or difficulties in selling their products and, in turn, will reduce or cancel orders for wafers from us. The timing, severity and recovery of these downturns cannot be predicted accurately or at all. When they occur, our business, profitability and price of the common shares and ADSs are likely to suffer. In addition, we may not be able to verify or guarantee the creditworthiness of some of our customers. If customers fail to make payments on a timely basis and accumulate substantial accounts receivable, we may not be able to collect payments or may incur substantial costs and expenses to pursue legal remedies to recover such losses, which may have an adverse effect on our financial conditions and results of operations.

5

Overcapacity in the semiconductor industry may reduce our revenues, earnings and margins.

The prices that we can charge our customers for our services are significantly related to the overall worldwide supply of integrated circuits and semiconductor products. The overall supply of semiconductor products is based in part on the capacity of other companies, which is outside of our control. For example, in light of the current market conditions, some companies, including our largest competitors, have announced plans to increase capacity expenditures significantly. We believe such plans, if carried out as planned, will increase the industry-wide capacity and are likely to result in overcapacity in the future. In periods of overcapacity, if we are unable to offset the adverse effects of overcapacity through, among other things, our technology and product mix, we may have to lower the prices we charge our customers for our services and/or we may have to operate at significantly less than full capacity. Such actions could reduce our margin and profitability and weaken our financial condition and results of operations. We cannot give any assurance that an increase in the demand for foundry services in the future will not lead to overcapacity in the near future, which could materially adversely affect our revenues, earnings and margins.

Any problem in the semiconductor outsourcing infrastructure can adversely affect our operating revenues and profitability.

Many of our customers depend on third parties to provide mask tooling, assembly and test services, and we and our customers may not be able to control or direct such third parties to provide these services timely or at costs reasonable to our customers. If these customers cannot timely obtain these services on reasonable terms, they may not order any foundry services from us. This may significantly reduce our operating revenues and negatively affect our profitability.

We may be unable to implement new technologies as they become available, which may result in the decrease of our profitability and the loss of customers and market share.

The semiconductor industry is characterized by rapidly evolving and constantly changing technology. If we do not anticipate the technology evolution and rapidly adopt new and innovative technology, we may not be able to produce sufficiently advanced services at competitive prices. Our competitors may adopt new technology before we do and reduce our ability to compete effectively in the market. If we are unable to begin offering advanced services and processes on a competitive and timely basis, we may lose customers to our competitors providing similar technologies, which may cause our operating revenues to decline unless we can replace lost customers with new customers. In addition, the market prices for advanced technology and services tend to fall over time. As a result, if we are unable to offer new advanced services and processes on a competitive and timely basis, we may need to reduce prices that we set for our existing services and processes, which would have a negative effect on our profitability. We also depend upon the introduction of new technologies on a timely basis in order to benefit from the relatively higher prices such new technologies offer in the earlier stages of their life cycles. If we are unable to introduce new technologies on a timely and competitive basis, we may not be able to benefit from the relatively higher prices for new technologies, and our average selling price and profits would decrease accordingly.

We may be unable to provide leading technology to our customers if we lose the support of our technology partners.

Enhancing our manufacturing process technologies is critical to our ability to provide services for our customers. We intend to continue to advance our process technologies through internal research and development and alliances with other companies. In addition to our internal research and development team focused on developing new and improved semiconductor manufacturing process technologies, we are also dependent on some of our technology partners to advance certain process technology portfolios. In addition, we currently have patent cross-licensing agreements with several companies, including International Business Machines Corporation, or IBM. Some mask and equipment vendors also supply our technology development teams with masks and equipment needed to develop more advanced processing technologies. If we are unable to continue any of our joint development arrangements, patent cross-licensing agreements and other agreements, on mutually beneficial economic terms, if we re-evaluate the technological and economic benefits of such relationships, if we are unable to enter into new technology alliances and arrangements with other leading and specialty semiconductor companies, or if we fail to secure masks and equipment from our vendors in a timely manner sufficient to support our ongoing technology development, we may be unable to continue providing our customers with leading edge mass-producible process technologies and may, as a result, lose important customers, which would have a materially adverse effect on our businesses, results of operations and financial condition.

In addition, some of our customers rely upon third-party vendors, or intellectual property (IP) vendors, for the IP they embed into their designs. Although we work and collaborate with IP vendors with respect to such matters, there can be no guarantee that we will be successful or that the vendors will deliver according to our requirements or the needs of our customers. Failures to meet the targets or to deliver on a timely basis could cause customers to cancel orders and/or shift capacity to other suppliers.

6

The COVID-19 pandemic may materially and adversely affect our business and operations, as well as our financial condition and results of operations.

Our business and results of operations may be adversely affected by the global COVID-19 pandemic and related events and we expect its impact to continue. The ongoing COVID-19 pandemic may materially adversely affect our business and results of operations in several ways, including but not limited to: (i) interruption and disruptions of our supply chains for equipment, parts and materials in terms of manufacturing, logistics, and manpower arrangements for tool installation; (ii) significant fluctuation in customer demands for certain products, leading to uncertainties for our capacity planning and our ability to meet such demands; (iii) strict border control measures and travel restrictions, which may delay or limit our employees or vendors from completing necessary training programs or providing services; and (iv) potential production delays for our products due to forced factory or office closures or partial operation.

We have implemented various measures to address the abovementioned risks, including but not limited to, health management of our employees, management of production inventory and supply chain risk management. However, there is no certainty that the measures we have taken will be sufficient to mitigate the risks posed by COVID-19 pandemic, and our ability to perform critical functions and to meet customers’ needs could be materially adversely affected. In addition, there is also a risk that any post-pandemic downward changes in consumers’ demand for electronic products may in turn, lead to reduced demand for our products and services.

In addition, if any of our employees is suspected of having contracted COVID-19 or any contagious disease, we may under certain circumstances be required to quarantine such employees and the affected areas of our premises. Therefore, we may have to temporarily suspend part of or all of our operations. Furthermore, government actions to contain the outbreak may restrict the level of economic activities in affected regions, including Taiwan and China, and affect the willingness and ability of our employees and customers to travel, which may also adversely affect our business and prospects. Moreover, any lockdown or limitation on economic activities imposed by the governments may prevent us from operating our fabs effectively and cause disruption to our customers. As a result, we cannot assure you that any future outbreak of contagious diseases would not have a material adverse effect on our financial condition and results of operations.

The full extent of the future impact of the COVID-19 pandemic on our operational and financial performance is uncertain and will depend on many factors beyond our control, including, without limitation, the timing, extent, trajectory and duration of the pandemic; the availability, distribution and effectiveness of vaccines; the spread of new variants of COVID-19; the continued and renewed imposition of protective public safety measures; the continuing global disruption in supply chains in our industries and the impact of the pandemic on the global economy, inflation and demand for consumer products. Even after the pandemic has subsided and economic activities gradually increase, we may continue to experience material and adverse impacts to our business, operating results, and financial condition as a result of the pandemic’s lasting global economic impact, including any recession that has occurred or may occur in the future in our industries or continuing inflationary impacts.

Our business may suffer if we cannot compete successfully in our industry.

The worldwide semiconductor foundry industry is highly competitive. We compete with dedicated foundry service providers such as Taiwan Semiconductor Manufacturing Company Limited, Semiconductor Manufacturing International (Shanghai) Corporation, Globalfoundries Inc., as well as the foundry operation services of some integrated device manufacturers, such as Intel, Samsung Electronics, or Samsung, SK Hynix and Toshiba Corporation, or Toshiba. Integrated device manufacturers principally manufacture and sell their own proprietary semiconductor products, but may also offer foundry services. Other competitors such as Dongbu Anam Semiconductor, Hua Hong, Powerchip, TowerJazz, Vanguard and XMC have initiated efforts to expand and develop substantial additional foundry capacity. New entrants and consolidations in the foundry business are likely to initiate a trend of competitive pricing and create potential overcapacity in legacy technology. Some of our competitors have greater access to capital and substantially greater production, research and development, marketing and other resources than we do. As a result, these companies may be able to compete more aggressively over a longer period of time than we can.

The principal elements of competition in the wafer foundry market include:

• technical competence;

• time-to-volume production and cycle time;

• time-to-market;

• research and development quality;

• available capacity;

• manufacturing yields;

• customer service and design support;

• price;

• management expertise; and

• strategic alliances.

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Our ability to compete successfully also depends on factors partially outside of our control, including product availability, IP, including cell libraries that our customers embed in their product designs, and industry and general economic trends.

We may not be able to implement our planned growth if we are unable to obtain the financing necessary to fund the substantial capital expenditures we expect to incur.

Our business and the nature of our industry require us to make substantial capital expenditures leading to a high level of fixed costs. The costs of facilities, tools and equipment to make semiconductors with advanced technology continue to rise, with each generation typically significantly more expensive than the larger-in-size more mature technologies which preceded. We expect to incur significant capital expenditures in connection with our growth plans. These capital expenditures will be made in advance of any additional sales to be generated by new or upgraded fabs as a result of these expenditures. Given the fixed-cost nature of our business, we have in the past incurred, and may in the future incur, operating losses if our revenues do not adequately offset our capital expenditures. Additionally, our actual expenditures may exceed our planned expenditures for a variety of reasons, including changes in:

• our growth plan;

• our process technology;

• our research and development efforts and patent license arrangements;

• market conditions;

• interest rates;

• exchange rate fluctuations; and

• prices of equipment.

We cannot assure you that additional financing will be available on satisfactory terms, if at all. If adequate funds are not available on satisfactory terms, we may be forced to curtail our expansion plans or delay the deployment of our services, which could result in a loss of customers and limit the growth of our business.

We depend on a small number of customers for a significant portion of our operating revenues and any loss of these customers would result in significant declines in our operating revenues.

We have been largely dependent on a small number of customers for a substantial portion of our business. In 2021, our top ten customers accounted for 54.5% of our operating revenues and a customer from our wafer fabrication segment accounted for at least 10% of operating revenues for the years ended December 31, 2019, 2020 and 2021. We expect that we will continue to depend upon a relatively limited number of customers for a significant portion of our operating revenues. We cannot assure you that our operating revenues generated from these customers, individually or in the aggregate, will reach or exceed historical levels in any future period. Loss or cancellation of business from significant changes in scheduled deliveries to, or decreases in the prices of services sold to any of these customers could significantly reduce our operating revenues.

Our customers generally do not place purchase orders far in advance, which makes it difficult for us to predict our future revenues, adjust production costs and allocate capacity efficiently on a timely basis. In addition, due to the cyclical nature of the semiconductor industry, our customers’ purchase orders have varied significantly from period to period. As a result, we do not typically operate with any significant backlog, except in periods of extreme capacity shortage. The lack of significant backlog and the unpredictable length and timing of semiconductor cycles make it difficult for us to forecast our revenues in future periods. Moreover, our expense levels are based in part on our expectations of future revenues, and we may be unable to adjust costs in a timely manner to compensate for revenue shortfalls. We expect that in the future our operating revenues in any quarter will continue to be substantially dependent upon purchase orders received in that quarter.

Moreover, the increasing trend in mergers and acquisitions activities in the semiconductor industry could reduce total available customer base, which could potentially result in a loss of customers.

Our operations and business will suffer if we lose one or more of our key personnel without adequate replacements.

Our future success to a large extent depends on the continued services of our Chairman and key executive officers. We do not carry key person insurance on any of our personnel. If we lose the services of any of our Chairman or key executive officers, it could be difficult to find and integrate replacement personnel in a short period of time, which could harm our operations and the growth of our business.

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We may have difficulty attracting and retaining skilled employees, who are critical to our future success.

The success of our business depends upon attracting and retaining experienced executives, engineers and other employees to implement our strategy. The competition for skilled employees is intense in our industry, which is exacerbated by the shortage of qualified personnel with appropriate experiences and expertise. We expect demand for personnel in Taiwan to increase in the future as new wafer fabrication facilities and other businesses are established in Taiwan. We also expect demand for experienced personnel in other locations to increase significantly as our competitors establish and expand their operations. Some of our competitors are willing to offer better compensation than what we do to our executives, engineers and other employees. We do not have long-term employment contracts with any of our employees. If we were unable to retain our existing personnel or attract, assimilate and recruit new experienced personnel in the future, it could seriously disrupt our operations and delay or restrict the growth of our business.

Our transactions with affiliates and shareholders may hurt our profitability and competitive position.

We have provided foundry services to several of our affiliates and shareholders. We currently do not provide any preferential treatment to any of these affiliates and shareholders. However, we may in the future reserve or allocate our production capacity to these companies if there is a shortage of foundry services in the market to enable these companies to maintain their operations and/or to protect our investments in them. This reservation or allocation may reduce our capacity available for our other customers, which may damage our relationships with other customers and discourage them from using our services. This may hurt our profitability and competitive position.

If we fail to maintain an effective system of internal control over financial reporting, we may be unable to accurately report our financial results or prevent fraud, and investor confidence in our company may be adversely affected.

We are required to comply with the R.O.C. and the U.S. securities laws and regulations in connection with internal controls. As a public company in the United States, our management is required to assess the effectiveness of our internal control over financial reporting using the criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), or the COSO criteria, as required by Section 404 of the Sarbanes-Oxley Act of 2002. Moreover, even if our management concludes that our internal control over financial reporting is effective, our independent registered public accounting firm may decline to issue an opinion as to the effectiveness of our internal control over financial reporting, or may issue a report that is qualified or adverse. During the course of the evaluation of internal control over financial reporting, we or our independent registered public accounting firm may identify control deficiencies that we may not be able to remediate prior to the date of our first assessment of internal control over financial reporting. Our failure to achieve and maintain effective internal control over financial reporting could result in the loss of investor confidence in the reliability of our financial statements or prevent fraud, which in turn could harm our business and negatively impact the trading price of our securities.

Although effective internal controls can provide reasonable assurance with respect to the preparation and fair presentation of financial statements, they may not prevent or detect misstatements because of their inherent limitations, including the possibility of human error, the circumvention or overriding of controls, fraud or corruption. If we fail to maintain the adequacy of our internal controls, our business and operating results could be harmed, we could fail to meet our reporting obligations, and there could be a material adverse effect on the market price of our common shares and ADSs.

The trend of adopting protectionist measures in certain countries, including the United States, could have a material adverse impact on our results of operations and financial condition.

Governments in the United States, PRC and certain other countries have implemented fiscal and monetary programs to stimulate economic growth as a result of the recent economic downturn, and many of these programs include protectionist measures that encourage the use of domestic products and labor. Recent policy developments by the governments in US, China and elsewhere also suggest an increased unwillingness to allow international companies to invest in or acquire local businesses. Since many of our direct customers and other downstream customers in the supply chain are located in or have operations in the countries where protectionist measures were adopted, such protectionist measures may have a material adverse effect on demand for our manufacturing services.

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We may decide to make strategic acquisitions of other companies, assets or businesses and such acquisitions may introduce significant risks and uncertainties, including risks related to integrating the acquired assets or businesses.

In order to position ourselves to take advantage of growth opportunities, we have made, and may continue to make, certain strategic acquisitions, mergers and alliances that involve significant risks and uncertainties. Even if we have identified a suitable target or partner for a strategic transaction, there is no guarantee that we will be able to negotiate a successful agreement at pricing favorable to us or to consummate the transaction in a timely manner, or at all. Furthermore, we may incur significant costs in pursuing such strategic transaction and invest in a substantial amount of time and effort without a guarantee that such transaction will be completed. Successful acquisitions and alliances in the semiconductor industry are difficult to accomplish because they require efficient integration and aligning of product offerings and manufacturing operations and coordination of sales and marketing and research and development efforts. The difficulties of integration and alignment may be increased by the necessity of coordinating geographically separated organizations, the complexity of the technologies being integrated and aligned and the necessity of integrating personnel with disparate business backgrounds and combining different corporate cultures. Furthermore, there is no guarantee that we will be able to identify a viable target for strategic acquisition, and we may incur significant costs and resources in such effort that may not result in a successful acquisition. In addition, we may also issue equity securities to pay for future acquisitions or alliances, which could be dilutive to existing shareholders. We may also incur debt or assume contingent liabilities in connection with acquisitions and alliances, which could impose restrictions on our business operations and harm our operating results.

We may not be able to fully realize the expected benefits from the acquisition of USJC and the operation of USJC may subject us to additional risks.

In October 2019, we closed a transaction to acquire Fujitsu’s interest in Mie Fujitsu Semiconductor Limited, or MIFS. Upon the closure of such transaction, MIFS was later renamed United Semiconductor Japan Corporation LTD., or USJC, and became one of our wholly-owned subsidiaries. There is a large number of processes, policies, procedures, operations, technologies and systems at USJC and UMC that must be integrated, including accounting and finance, payroll, revenue management, commercial operations, risk management and employee benefits. We expect to incur significant expenses and costs to complete the integration process which may adversely affect our financial performance. The integration of newly acquired businesses will also require a significant amount of time and attention from management. Moreover, even if we were able to fully integrate the business operations of USJC successfully, there can be no assurance that this integration will result in the realization of the full benefits of synergies, cost savings, innovation and operational efficiencies that may be possible from this integration or that these benefits will be achieved within a reasonable period of time. Delays in integrating USJC, which could be caused by factors outside of our control, could adversely affect the intended benefits of our business, financial results, financial condition and stock price. In addition, the acquisition may subject us to additional operational and financial risks, including the following:

• uncertainties in the business relationships with our collaborators and suppliers;

• loss of customers and uncertainties with continuation of customer relationships previously held by MIFS;

• additional capital expenditures required to upgrade and operate the new fab;

• additional costs relating to compliance with rules and regulations in Japan;

• failure to achieve appropriate manufacturing yields or products to meet our or our customers’ specifications;

• problems in ramping production and installing new equipment; and

• loss of employees or labor issue.

Any of these risks may prevent us from realizing the benefits of the acquisition or reduce our ability to achieve profitability at the fab, which may have an adverse effect on our financial condition and results of operations.

Currency fluctuations could increase our costs relative to our revenues, which could adversely affect our profitability.

More than half of our operating revenues are denominated in currencies other than New Taiwan dollars, primarily in U.S. dollars. On the other hand, more than half of our costs of direct labor, raw materials and overhead are incurred in New Taiwan dollars. Although historically we hedged a portion of the resulting net foreign exchange position through the use of foreign exchange spot transactions, or currency forward contracts, we are still affected by fluctuations in foreign exchange rates among the U.S. dollar, the New Taiwan dollar and other currencies. Any significant fluctuation in exchange rates may impact on our financial condition and the U.S. dollar value of the ADSs and the U.S. dollar value of any cash dividends we distributed, which could have an adverse effect on the market price of the ADSs.

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Risks Relating to Manufacturing

Our manufacturing processes are highly complex, costly and potentially vulnerable to impurities and other disruptions that can significantly increase our costs and delay product shipments to our customers.

Our manufacturing processes are highly complex, require advanced and costly equipment and are continuously being modified to improve manufacturing yields and product performance. Impurities or other difficulties in the manufacturing process or defects with respect to equipment or supporting facilities can lower manufacturing yields, interrupt production or result in losses of products in process. As system complexity has increased and process technology has become more advanced, manufacturing tolerances have been reduced and requirements for precision have become even more demanding. Although we have been enhancing our manufacturing capabilities and efficiency, from time to time we have experienced production difficulties that have caused delivery delays and quality control problems, as is common in the semiconductor industry. In the past we have encountered the following problems:

• capacity constraints due to changes in product mix or the delayed delivery of equipment critical to our production, including scanners, steppers and chemical stations;

• construction delays during expansions of our clean rooms and other facilities;

• difficulties in upgrading or expanding existing facilities;

• manufacturing execution system or automatic transportation system failure;

• unexpected breakdowns in our manufacturing equipment and/or related facilities;

• changing or upgrading our process technologies;

• raw materials shortages and impurities; and

• delays in delivery and shortages of spare parts and in maintenance for our equipment and tools.

Should these problems persist or repeat, we may suffer delays in delivery and/or loss of business and revenues. In addition, we cannot guarantee that we will be able to increase our manufacturing capacity and efficiency in the future to the same extent as in the past.

Our profit margin may substantially decline if we are unable to continuously improve our manufacturing yields, maintain high capacity utilization and optimize the technology mix of our silicon wafer production.

Our ability to maintain our profitability depends, in part, on our ability to:

• maintain high capacity utilization, which is defined as the ratio of the wafer-out quantity of 8-inch wafer equivalents divided by our estimated total 8-inch equivalent capacity in a specified period. The estimated capacity figures may vary depending upon equipment delivery schedules, pace of migration to more advanced processing technologies and other factors affecting production ramp-ups;

• maintain or improve our manufacturing yields, which is defined as the percentage of usable devices manufactured on a wafer; and

• optimize the technology mix of our production by increasing the number of wafers manufactured by utilizing different processing technologies.

Our manufacturing yields directly affect our ability to attract and retain customers, as well as the price of our services. Our capacity utilization affects our operating results because a large percentage of our operating costs are fixed. Our technology mix affects utilization of our equipment and process technologies, as well as the prices we can charge, either of which can affect our margins. If we are unable to continuously improve our manufacturing yields, maintain high capacity utilization or optimize the technology mix of our wafer production, our profit margin may substantially decline.

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We may have difficulty in ramping up production in accordance with our schedule, which could cause delays in product deliveries and decreases in manufacturing yields.

As is common in the semiconductor industry, we have from time to time experienced difficulties in ramping up production at new or existing facilities or effecting transitions to new manufacturing processes. As a result, we have suffered delays in product deliveries or reduced manufacturing yields. We may encounter similar difficulties in connection with:

• the migration to more advanced process technologies, such as 45/40 and 28-nanometer and more advanced process technology;

• the joint development with vendors for more powerful tools (both in production and inspection) needed in the future to meet advanced process technology requirements; and

• the adoption of new materials in our manufacturing processes.

We may face construction delays, interruptions, infrastructure failure and delays in upgrading or expanding existing facilities, or changing our process technologies, any of which might adversely affect our production schedule. Our failure to achieve our production schedule could delay the time required to recover our investments and seriously affect our profitability.

Our production schedules could be delayed and we may lose customers if we are unable to obtain raw materials and equipment in a timely manner.

We depend on our suppliers for raw materials. To maintain competitive manufacturing operations, we must obtain from our suppliers, in a timely manner, sufficient quantities of quality materials at acceptable prices. Although we source our raw materials from several suppliers, a small number of these suppliers account for a substantial amount of our supply of raw materials because of the consistent quality of their products. For example, in 2019, 2020 and 2021, we purchased a majority of our silicon wafers from five makers, Shin-Etsu Handotai Corporation, or Shin-Etsu, GlobalWafers, Siltronic and Sumco Group (including Sumco Corporation and Formosa Sumco Technology Corporation) and Soitec. From time to time, our suppliers have extended lead time or limited the supply of required materials to us because of capacity constraints. Consequently, from time to time, we have experienced difficulty in obtaining the quantities of raw materials we need on a timely basis.

In addition, from time to time we may reject materials that do not meet our specifications and quality standards, resulting in declines in output or manufacturing yields. We cannot assure you that we will be able to obtain sufficient quantities of raw materials and other supplies in a timely manner. Furthermore, the recent global supply chain disruption may adversely affect our ability to acquire and purchase raw materials in sufficient quantities or at all, or in a timely manner. Furthermore, the recent global supply chain disruption may adversely affect our ability to acquire and purchase raw materials in sufficient quantities or at all, or in a timely manner. If the supply of materials is substantially diminished or if there are significant increases in the costs of raw materials, we may be forced to incur additional costs to acquire sufficient quantities of raw materials to sustain our operations, which may increase our marginal costs and reduce profitability.

We also depend on a limited number of manufacturers and vendors that make and maintain the complex equipment we use in our manufacturing processes. We also rely on these manufacturers and vendors to improve our technology to meet our customers’ demands as technology improves. In periods of unpredictable and highly diversified market demand, the lead time from order to delivery of this equipment can be as long as fourteen to forty-two months. If there are delays in the delivery of equipment or in the availability or performance of necessary maintenance, or if there are increases in the cost of equipment, it could cause us to delay our introduction of new manufacturing capacity or technologies and delay product deliveries, which may result in the loss of customers and revenues.

We may be subject to the risk of loss due to fire because the materials we use in our manufacturing processes are highly flammable.

We use highly flammable materials such as silane and hydrogen in our manufacturing processes and may therefore be subject to the risk of loss arising from fires. The risk of fire associated with these materials cannot be completely eliminated. We maintain insurance policies to reduce losses caused by fire, including business interruption insurance. However, our insurance coverage is subject to deductibles and self-insured retention and may not be sufficient to cover all of our potential losses. If any of our fabs were to be damaged or cease operations as a result of a fire, it would temporarily reduce manufacturing capacity and reduce revenues.

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We and many of our customers and suppliers are vulnerable to natural disasters and other events outside of our control, which may seriously disrupt our operations.

Most of our assets and many of our customers and suppliers are located in certain parts of Taiwan. Our operations and the operations of our customers and suppliers are vulnerable to earthquakes, floods, droughts, power losses and similar events that affect the locations of our operations. The occurrence of any of these events could interrupt our services and cause severe damages to wafers in process, or cause significant business disruptions. For example, given the prolonged period in the lack of rainfall particularly acute in southern Taiwan which may impact our manufacturing capacity and may cause us to lose important customers, therefore may have a potentially adverse and material impact on our operational and financial performance. Besides the potential risks that may be caused by water shortage, we have in the past experienced severe earthquakes which adversely affected our wafer manufacturing operations in Taiwan. Although we had adopted practices in compliance with ISO 22301 business continuity standards which ensured the safety of our employees and minimized supply disruptions resulting from the earthquake and we recovered partially the losses resulting for this earthquake from our insurance policy, there is no guarantee that our business continuity practices will always be effective. There is also no guarantee that any future damages or business loss from severe natural disasters will be covered by such insurance, that we will be able to collect from our insurance carriers, should we choose to claim under our insurance policies, or that such coverage will be sufficient. Furthermore, the cost of insurance policies may increase in the future that will make it more expensive for us to obtain and maintain adequate insurance policies. In addition, our manufacturing facilities have occasionally experienced insufficient power supplies, and our operations have been disrupted.

Our operations may be delayed or interrupted and our business could suffer if we violate environmental, safety and health, or ESH, regulations.

The semiconductor manufacturing process requires the use of various gases, chemicals, hazardous materials and other substances such as solvents and sulfuric acid which may have an impact on the environment. We are always subject to ESH regulations, and a failure to manage the use, storage, transportation, emission, discharge, recycling or disposal of raw materials or to comply with these ESH regulations could result in (i) regulatory penalties, fines and other legal liabilities, (ii) suspension of production or delays in operation and capacity expansion, (iii) a decrease in our sales, (iv) an increase in pollution cleaning fees and other operation costs, or (v) damage to our public image, any of which could harm our business. In addition, as ESH regulations are becoming more comprehensive and stringent, we may incur a greater amount of capital expenditures in technology innovation and materials substitution in order to comply with such regulations, which may adversely affect our results of operations.

Climate change may negatively affect our business.

There is increasing concern that climate change is occurring and may have dramatic effects on human activity without aggressive remediation steps. The change in temperature would result in increased severity and frequency of extreme weather events such as cyclones, floods, water stress, high temperature and increasing risk of extinction for the world’s species. Public expectations for reductions in greenhouse gas emissions and climate-related risks could result in increased energy, water, transportation and raw material costs, which raised shareholder’s concern and caused several international standards and questionnaires being revised to request enterprises disclosing their risks and financial impacts. Consequently, our climate change risk assessment tool was developed and related departments participated in the identification work.

As climate change continues to be severe, the international community not only pays attention to the energy transition, but also successively establishes mechanisms for monetizing the impact of carbon emissions on society and the environment, such as carbon pricing mechanism, carbon border adjustment mechanism, etc. For example, we have an advanced 12-inch wafer fab in Singapore. The Singapore government introduced a carbon tax from 2019 onwards, making it the first country in Southeast Asia to promote this measure. In Taiwan, the Environmental Protection Administration proposed a draft revision to the GHG Management Act with an amendment of its name to “Climate Change Response Act” in 2021. There are additional stringent regulations including a carbon-fee charging to promote GHG reduction and low-carbon economy development.

In addition, government’s energy policy may cause power shortage and affect our business operation. For example, “Dual control” to reduce energy intensity and to limit total energy consumption is a key measure that the Chinese government implements to help meet its energy and climate goals. In 2021, some provinces started to employ power rationing for high-energy-consuming industries. Although UMC has not been affected yet, we will continue to pay attention to this risk.

We have developed climate change risk assessment tool and related departments participated in the identification work. Adaptation and mitigation measures are developed in response to the identified climate change risk. Furthermore, we also disclosed risk and opportunity of climate change according to the framework of TCFD (Task Forced on Climate-related Financial Disclosures) in UMC Sustainability Report and our official website. In May 2021, UMC meets the TCFD performance assessment at management level of “Pioneer” which verified by SGS Taiwan Ltd., endorsing that our climate change risk assessment system and associated financial disclosure data are highly credible and transparent.

Disruptions in the international trading environment may seriously decrease our international sales.

A substantial portion of our operating revenues is derived from sales to customers located in countries other than the countries where our fabs are located. We operated fabs in Taiwan, Singapore, China and Japan. For the years ended December 31, 2019, 2020 and 2021, we generated approximately 27.9%, 27.0% and 27.4% of our operating revenues, respectively, from countries other than those where our fabs are located. We expect sales to customers from countries outside of Taiwan, Singapore, China and Japan will continue to represent a significant portion of our operating revenues. The success and profitability of our international activities depend on certain factors beyond our control, such as general economic conditions, labor conditions, political stability, tariff, tax laws, import duties, export control and foreign exchange controls of the countries in which we sell our products, and the political and economic relationships between these countries. As a result, our manufacturing services will continue to be vulnerable to disruptions in the international trading environment, including adverse changes in foreign government regulations, political unrest and international economic downturns.

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These disruptions in the international trading environment affect the demand for our manufacturing services and change the terms upon which we provide our manufacturing services overseas, which could seriously decrease our international sales.

Political, Economic, Regulatory and Legal Risks

We face substantial political risks associated with doing business in Taiwan, particularly due to the tense relationship between the R.O.C. and the People’s Republic of China, or the PRC, that could negatively affect the value of your investment.

Our principal executive offices and most of our assets and operations are located in Taiwan. Accordingly, our business, financial condition and results of operations and the market price of our common shares and the ADSs may be affected by changes in R.O.C. governmental policies, taxation, inflation or interest rates and by social instability and diplomatic and social developments in or affecting Taiwan which are outside of our control. Taiwan has a unique international political status. Since 1949, Taiwan and the Chinese mainland have been separately governed. The PRC claims that it is the sole government in China and that Taiwan is part of China. Although significant economic and cultural relations have been established between the R.O.C. and the PRC in the past few years, such as the adoption of the Economic Cooperation Framework Agreement and memorandum regarding cross-strait financial supervision, we cannot assure you that relations between the R.O.C. and PRC will not become strained again, in particular, considering the increasingly tense relationship between the United States and the PRC. For example, the PRC government has refused to renounce the use of military force to gain control over Taiwan and, in March 2005, passed an Anti-Secession Law that authorized non-peaceful means and other necessary measures should Taiwan move to gain independence from the PRC. Past developments in relations between the R.O.C. and the PRC have on occasions depressed the market prices of the securities of companies in the R.O.C. Such initiatives and actions are commonly viewed as having a detrimental effect to reunification efforts between the R.O.C. and the PRC. Relations between the R.O.C. and the PRC and other factors affecting military, political or economic conditions in Taiwan could materially and adversely affect our financial condition and results of operations, as well as the market price and the liquidity of our securities.

Our business depends on the support of the R.O.C. government and other government authorities in countries and regions where we operate, and a decrease in these supports may reduce our net income.

We, like many R.O.C. technology companies, have benefited from substantial tax incentives provided by the R.O.C. government and other government authorities in countries and regions where we operate under various different tax incentive programs, which are subject to the review and approval by the relevant tax authorities on the case by case basis. Although we will make our best efforts to meet the requirements under different incentive schemes and make the relevant applications, we cannot assure you that the tax authorities will grant the approval as we apply. Our application may be denied for reasons outside of our control, including changes in tax incentive regulations and criteria for qualifications. Additionally, the tax incentives granted, taken as a whole, may not be as favorable to us as those currently in effect. If any of the above occurs, our net income may decrease.

Our future tax obligations may adversely affect our net income.

We operate in various jurisdictions, which involve different tax regimes and application of tax regulations. Applicable taxes for which we make provisions could increase significantly as a result of changes in applicable tax laws in the countries where we operate.

Some of the above-mentioned tax incentives maybe subject to the investment milestone and comply with the terms and conditions set forth in the agreements with the government. Failure to fulfill the investment milestone or the terms and conditions would result in termination or revocation of the incentives. The local authority may have the rights to revoke these incentive rewards even if the company received tax benefits that it had enjoyed during the applicable period by the applicable tax laws or regulations.

The Organization for Economic Cooperation and Development (OECD) and G20 countries worked together to create the OECD/G20 Inclusive Framework on Base Erosion and Profit Shifting (BEPS), which contemplates changes to numerous international tax principles. Over 135 members agreed to a two-pillar solution to address the tax challenges arising from the digitalization of the economy and Global Anti-Base Erosion Model Rules. Pillar 1 aims to ensure a better distribution of taxation of multinationals according to the countries in which they operate, and Pillar 2 aims to control tax competition on corporate profits by introducing a global minimum tax of 15%. The taxation of two-pillar solution is expected to implement as soon as Jan, 1 2023. In response to the domestic minimum corporate tax rate aimed by Pillar 2, Taiwan’s finance ministry planned to increase the Alternative

Minimum Tax from 12% to 15% effective from 2023. In addition, Taiwan finance ministry will endeavor to implement Pillar 1 and 2 as proposed by OECD and Inclusive Framework.

The R.O.C. income Tax Act was amended in 2016 to introduce controlled foreign company (CFC) provisions, and the implementation rules were announced in September 2017. The legislation has announced to effective on Jan, 1 2023.

The implementation of two-pillar solution and CFC rule may increase our income tax rate in future and cause adverse effect to our net income.

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Compliance with U.S. Conflict Minerals Law may affect our ability or the ability of our suppliers to purchase raw materials at an effective cost.

We are subject to U.S. disclosure rules on conflict minerals adopted by the SEC, pursuant to which we are required to conduct due diligence of our supply chain and file an annual report to disclose whether conflict minerals utilized by us originated in the Democratic Republic of the Congo (DRC) or an adjoining country. We have filed the conflict mineral disclosure report every year since 2014 in order to comply with such rules, we will continue to verify the relevant information with our vendors and suppliers and file the required report but we cannot assure you that we will be able to collect all the information required to comply with such regulations. If we are not able to confirm such information with vendors, or if we discover that some vendors are sourcing conflict minerals from prohibited countries, we may decide or be required to discontinue our relationship with such vendors, which may negatively impact our ability to obtain adequate supplies of materials needed for the manufacturing of our products and services. The failure to obtain necessary information or to maintain adequate supplies of materials from supply chains outside the DRC and adjoining countries may delay our production, increasing the risk of losing customers and business.

Similarly, many jurisdictions have promulgated regulations with the intention to deter human rights violations within supply chains. Possible violation by our suppliers may not be known to us and is beyond our control. While we believe our suppliers comply with applicable human rights requirements, there can be no guarantee that they will continue to do so, or that we will be able to obtain the necessary information on their activities to comply with whatever future requirements may be enacted.

Cyberattacks and data security breaches may adversely affect our operations and damage our reputation.

Our business and operations depend upon reliable and uninterrupted information technology services, including the integrity of our web-based and electronic customer service systems. Although we have implemented what we believe are reasonable precautions to prevent accidental and/or malicious disruption of these services, there can be no assurance that our preventive measures will preclude failure of the information technology, web-based and electronic customer service systems upon which our business depends. Our systems might also be damaged by natural or man-made events or by computer viruses, physical or electronics break-ins, cyber-attacks and similar disruptions affecting the global Internet. Disruption of these systems could adversely affect our ability to operate our business and to serve our customers, thereby negatively affecting our financial performance.

In addition, in the course of our operations, we receive confidential information from and about our customers, vendors, partners and employees. Although we take what we believe are reasonable precautions to protect such information from disclosure to or interruption, there are no guarantees our precautions will prevent accidental or malicious access to such information. In the event of such unauthorized access, our reputation could be adversely affected, customers and others may not entrust us with their confidential information, which would negatively affect our operations, and we may incur costs to remedy the breach. Furthermore, the loss of confidential information of third parties may result in legal claims against us, in which case we will incur additional costs and expenses to defend such litigation.

Moreover, many jurisdictions have proposed stringent regulations concerning data privacy, and such regulations may impose additional legal requirements that make our operations more expensive and/or less efficient. In addition, should we experience a breakdown in our systems or failure in our precautions that results in a violation of such regulations, we may suffer adverse customer reaction and face governmental penalties.

Intellectual property disputes could result in lengthy and costly arbitration, litigation or licensing expenses or prevent us from providing services to customers.

As is typical in the semiconductor industry, we or our customers may receive claims of infringement from time to time or otherwise become aware of potentially relevant patents or other intellectual property rights held by other parties that may cover some of our technology, products and services or those of our end customers. The semiconductor industry is characterized by vigorous protection and pursuit of intellectual property rights which has resulted in protracted and expensive arbitration and litigation for many companies.

Any litigation or arbitration regarding patents or other intellectual property could be costly and time consuming and could divert our management and key personnel from our business operations. We have in the past and may from time to time in the future become involved in litigation that requires our management to commit significant resources and time.

Because of the complexity of the technology involved and the uncertainty of litigation generally, any intellectual property arbitration or litigation involves significant risks. Any claim of intellectual property infringement against us may require us to:

• incur substantial legal and personnel expenses to defend the claims or to negotiate for a settlement of claims;

• pay substantial damages or settlement to the party claiming infringement;

• refrain from further development or sale of our products;

• enter into costly royalty or license agreements that might not be available on commercially reasonable terms or at all;

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• cross-license our technology with a competitor to resolve an infringement claim, which could weaken our ability to compete with that competitor;

• indemnify our distributors, end customers, licensees and others from the costs of and damages of infringement claims; and

• curtail or modify our operations in response to regulatory inquiries relating to the alleged infringement, which may result in additional costs and expenses.

In addition, because we have a global operation, we may be subject to intellectual property disputes and litigation in foreign jurisdictions with divergent laws and practices, which will make it more costly and time consuming for us to initiate or defend such litigations. Furthermore, if we are engaged or involved in a high profile intellectual property dispute or litigation in foreign countries with stringent national security regulations, such as the U.S. and China, we may be subject to heightened scrutiny by government agencies in such countries, which may lead to adverse actions taken by such government agencies, including prolonged investigation and litigation, which can negatively affect our operations and damage our reputation. Any intellectual property claim or litigation could harm our business, results of operations, financial condition and prospects.

Geopolitical and economic conflicts between the United States and China may adversely affect our business

Geopolitical conflicts and tensions between the United States and China have threatened and destabilized trading relationships and economic activities between the two countries. Because we have operations in both countries, such conflicts and tensions may negatively impact our business. At various times during recent years, the United States and China have had disagreements over political and economic issues, including but not limited to, the recent imposition of tariffs by the U.S. on goods imported from China and to the U.S. government’s efforts to restrict transfer and sharing of technologies, including semiconductor technologies, between the two countries. In addition, the U.S. government may enact new and more restrictive export control regulations that may reduce our ability to ship and sell products to certain customers in China and Asia and increase our cost to implement additional measures to comply with such new regulations. In addition, disagreements between the United States and China with respect to their political, military or economic policies toward Taiwan may contribute to further controversies. These controversies and trade frictions could have a material adverse effect on our business by, among other things, making it more difficult for us to coordinate our operations between the United States and China, causing a reduction in the demand for our products by customers in the United States or China and reducing our profitability due to increasing cost of compliance.

Risks Related to the Common Shares and ADSs and Our Trading Markets

Restrictions on the ability to deposit common shares into our ADS program may adversely affect the liquidity and price of the ADSs.

The ability to deposit common shares into our ADS program is restricted by R.O.C. law. Under current R.O.C. law, no person or entity, including you and us, may deposit common shares into our ADS program without specific approval of the R.O.C. FSC except for the deposit of the common shares into our ADS program and for the issuance of additional ADSs in connection with:

(A) distribution of share dividends or free distribution of our common shares;

(B) exercise of the preemptive rights of ADS holders applicable to the common shares evidenced by ADSs in the event of capital increases for cash; or

(C) delivery of our common shares which are purchased in the domestic market in Taiwan directly by the investor or through the depositary or are already in the possession of the investor to the custodian for deposit into our ADS program, subject to the following conditions: (a) the re-issuance is permitted under the deposit agreement and custody agreement, (b) the depositary may accept deposit of those common shares and issue the corresponding number of ADSs with regard to such deposit only if the total number of ADSs outstanding after the issuance does not exceed the number of ADSs previously approved by the R.O.C. FSC, plus any ADSs issued pursuant to the events described in (A) and (B) above and (c) this deposit may only be made to the extent previously issued ADSs have been withdrawn.

As a result of the limited ability to deposit common shares into our ADS program, the prevailing market price of our ADSs on the NYSE may differ from the prevailing market price of the equivalent number of our common shares on the Taiwan Stock Exchange.

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Holders of our ADSs will not have the same proposal or voting rights as the holders of our common shares, which may affect the value of your investment.

Except for treasury common shares and common shares held by our subsidiaries which meet certain criteria provided under the R.O.C. Company Act, each common share is generally entitled to one vote and no voting discount will be applied. However, except as described in this Annual Report and in the deposit agreement, holders of our ADSs will not be able to exercise voting rights attached to the common shares evidenced by our ADSs on an individual basis. Holders of our ADSs will appoint the depositary or its nominee as their representative to exercise the voting rights attached to the common shares represented by the ADSs. The voting rights attached to the common shares evidenced by our ADSs must be exercised as to all matters brought to a vote of shareholders collectively in the same manner.

Moreover, holders of the ADSs do not have individual rights to propose any matter for shareholders’ votes at our shareholders’ meetings. However, holders of at least 51% of the ADSs outstanding at the relevant record date may request the depositary to submit to us one proposal per year for consideration at our annual ordinary shareholders’ meeting, provided that such proposal meets certain submission criteria and limitations, including the language and the length of the proposal, the time of submission, the required certification or undertakings, and the attendance at the annual ordinary shareholders’ meeting. However, if the proposal submitted by the depositary does not qualify, we have no obligation to allow the depositary to modify such proposal.

Furthermore, if holders of at least 51% of the ADSs outstanding at the relevant record date instruct the depositary to vote in the same manner regarding a resolution, including election of directors, the depositary will appoint our Chairman, or his designee, to represent the ADS holders at the shareholders’ meetings and to vote the common shares represented by the ADSs outstanding in the manner so instructed. If by the relevant record date, the depositary has not received instructions from holders of ADSs holding at least 51% of the ADSs to vote in the same manner for any resolution, then the holders will be deemed to have instructed the depositary to authorize and appoint our Chairman, or his designee, to vote all the common shares represented by ADSs at his sole discretion, which may not be in your interest. As a result of these rules and restrictions, holders of ADSs have limited ability to vote or be represented with respect to any actions to be taken by shareholders of the Company.

The rights of holders of our ADSs to participate in our rights offerings may be limited, which may cause dilution to their holdings.

We may from time to time distribute rights to our shareholders, including rights to acquire our securities. Under the deposit agreement, the depositary will not offer those rights to ADS holders unless both the rights and the underlying securities to be distributed to ADS holders are either registered under the Securities Act of 1933, as amended (the “Securities Act”), or exempt from registration under the Securities Act. We are under no obligation to file a registration statement with respect to any such rights or underlying securities or to endeavor to cause such a registration statement to be declared effective. Accordingly, holders of our ADSs may be unable to participate in our rights offerings and may experience dilution in their holdings.

Changes in exchange controls that restrict your ability to convert proceeds received from your ownership of ADSs may have an adverse effect on the value of your investment.

Your ability to convert proceeds received from your ownership of ADSs depends on existing and future exchange control regulations of the Republic of China. Under the current laws of the Republic of China, an ADS holder or the depositary, without obtaining further approvals from the R.O.C. Central Bank of China, or the CBC, or any other governmental authority or agency of the Republic of China, may convert NT dollars into other currencies, including U.S. dollars, in respect of:

• the proceeds of the sale of common shares represented by ADSs or received as share dividends with respect to the common shares and deposited into the depositary receipt facility; and

• any cash dividends or distributions received from the common shares represented by ADSs.

In addition, the depositary may also convert into NT dollars incoming payments for purchases of common shares for deposit in the depositary receipt facility against the creation of additional ADSs. If you withdraw the common shares underlying your ADSs and become a holder of our common shares, you may convert into NT dollars subscription payments for rights offerings. The depositary may be required to obtain foreign exchange approval from the CBC on a payment-by-payment basis for conversion from NT dollars into foreign currencies of the proceeds from the sale of subscription rights of new common shares. Although it is expected that the CBC will grant approval as a routine matter, required approvals may not be obtained in a timely manner, or at all.

Under the Republic of China Foreign Exchange Control Law, the Executive Yuan of the Republic of China may, without prior notice but subject to subsequent legislative approval, impose foreign exchange controls or other restrictions in the event of, among other things, a material change in international economic conditions.

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Our public shareholders may have more difficulty protecting their interests than they would as shareholders of a U.S. corporation.

Our corporate affairs are governed by our articles of incorporation and bylaws governing R.O.C. corporations. The rights of our shareholders to bring shareholders’ suits against us or our board of directors under R.O.C. law are much more limited than those of the shareholders of U.S. corporations. Therefore, our public shareholders may have more difficulty protecting their interests in connection with actions taken by our management, members of our board of directors or controlling shareholders than they would as shareholders of a U.S. corporation. Please refer to “Item 10. Additional Information—B. Memorandum and Articles of Association—Rights to Bring Shareholders’ Suits” included elsewhere in this Annual Report for a detailed discussion of the rights of our shareholders to bring legal actions against us or our directors under R.O.C. law.

Holders of our ADSs will be required to appoint several local agents in Taiwan if they withdraw common shares from our ADS program and become our shareholders, which may make ownership burdensome.

Non-R.O.C. persons wishing to withdraw common shares represented by their ADSs from our ADS program and hold our common shares represented by those ADSs are required to, among other things, appoint a local agent or representative with qualifications set forth by the applicable R.O.C. laws and regulations to open a securities trading account with a local brokerage firm, pay R.O.C. taxes, remit funds and exercise shareholders’ rights. In addition, the withdrawing holders are also required to appoint a custodian bank or a securities firm with qualifications set forth by the R.O.C. FSC to hold the securities in safekeeping, make confirmations, settle trades and report all relevant information, in which the securities firm is appointed as the custodian, the payments shall be held in safekeeping in a special account opened in a bank approved by the R.O.C. FSC. Without making this appointment and opening of the accounts, the withdrawing holders would not be able to subsequently sell our common shares withdrawn from a depositary receipt facility on the Taiwan Stock Exchange. Under R.O.C. law and regulations, except under limited circumstances, PRC persons are not permitted to withdraw the common shares underlying the ADSs or to register as a shareholders of our company. Under the Regulations Governing Securities Investment and Futures Trading in Taiwan by Mainland Area Investors promulgated by the R.O.C. Executive Yuan on April 30, 2009, as amended, only qualified domestic institutional investors, or QDIIs and limited entities or individuals, are permitted to withdraw the common shares underlying the ADSs, subject to compliance with the withdrawal relevant requirements, and only QDIIs, and limited entities or individuals who meet the qualification requirements set forth therein are permitted to own common shares of an R.O.C. company listed for trading on the Taiwan Stock Exchange or the Taipei Exchange, provided that among other restrictions generally applicable to investments made by PRC persons, their shareholdings are subject to certain restrictions as set forth in the abovementioned regulations and that such mainland area investors shall apply for a separate approval if their investment, individually or in aggregate, amounts to or exceeds 10 percent of the common shares of any R.O.C. listed company.

You may not be able to enforce a judgment of a foreign court in the R.O.C.

We are a company limited by shares incorporated under the R.O.C. Company Act. Most of our assets and most of our directors, executive officers and experts named in the registration statement are located in Taiwan. As a result, it may be difficult for you to enforce judgments obtained outside Taiwan upon us or such persons in Taiwan. We have been advised by our R.O.C. counsel that any judgment obtained against us in any court outside the R.O.C. arising out of or relating to the ADSs will not be enforced by R.O.C. courts if any of the following situations shall apply to such final judgment:

• the court rendering the judgment does not have jurisdiction over the subject matter according to R.O.C. law;

• the judgment or the court procedure resulting in the judgment is contrary to the public order or good morals of the R.O.C.;

• the judgment was rendered by default, except where the summons or order necessary for the commencement of the action was legally served on us within the jurisdiction of the court rendering the judgment within a reasonable period of time or with judicial assistance of the R.O.C.; or

• judgments of the R.O.C. courts are not recognized in the jurisdiction of the court rendering the judgment on a reciprocal basis.

We may be considered a passive foreign investment company, which could result in adverse U.S. federal income tax consequences for U.S. investors.

We do not believe that we were a passive foreign investment company, or PFIC, for 2021 and we do not expect to become one in the future, although there can be no assurance in this regard. Characterization as a PFIC could result in adverse U.S. federal income tax consequences to you if you are a U.S. investor.

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For example, if we are a PFIC, our U.S. investors may become subject to increased tax liabilities under U.S. federal income tax laws and regulations and will become subject to burdensome reporting requirements. The determination of whether or not we are a PFIC is made on an annual basis and will depend on the composition of our income and assets from time to time. Specifically, for any taxable year we will be classified as a PFIC for U.S. federal income tax purposes if either (i) 75% or more of our gross income in a taxable year is passive income or (ii) the average percentage of our assets (which includes cash) by value in a taxable year which produce or are held for the production of passive income is at least 50%. The calculation of the value of our assets will be based, in part, on the quarterly market value of common shares and ADSs, which is subject to change. See “Taxation—U.S. Federal Income Tax Considerations For U.S. Persons—Passive Foreign Investment Company.”

The trading price of the common shares and ADSs may be adversely affected by the general activities of the Taiwan Stock Exchange and U.S. stock exchanges, the trading price of our common shares, increases in interest rates and the economic performance of Taiwan.

Our common shares are listed on the Taiwan Stock Exchange. The trading price of our ADSs may be affected by the trading price of our common shares on the Taiwan Stock Exchange and the economic performance of Taiwan. The Taiwan Stock Exchange is smaller and, as a market, more volatile than the securities markets in the United States and some European countries. The Taiwan Stock Exchange has experienced substantial fluctuations in the prices and volumes of sales of listed securities, and there are currently limits on the range of daily price movements on the Taiwan Stock Exchange. The Taiwan Stock Exchange is particularly volatile during times of political instability, such as when the relationship between Taiwan and the PRC becomes tense. Moreover, the Taiwan Stock Exchange has experienced disturbance caused by market manipulation, insider trading and payment defaults, and the government of Taiwan has from time to time intervened in the stock market by purchasing stocks listed on the Taiwan Stock Exchange. The recurrence of these or similar events could deteriorate the price and liquidity of our common shares and ADSs.

The market price of the ADSs may also be affected by general trading activities on the U.S. stock exchanges, which recently have experienced significant volatility with respect to trading prices of technology companies. Fluctuation in interest rates and other general economic conditions may also influence the market price of the ADSs.

ITEM 4 INFORMATION ON THE COMPANY

A. History and Development of the Company

Our legal and commercial name is United Microelectronics Corporation, commonly known as “UMC”. We were incorporated under the R.O.C. Company Law as a company limited by shares in May 1980 and our common shares are listed on the Taiwan Stock Exchange since 1985. Our principal executive office is located at No. 3 Li-Hsin Road II, Hsinchu Science Park, Hsinchu, Taiwan, Republic of China, and our telephone number is 886-3-578-2258. Our Internet website address is www.umc.com. The information on our website does not form part of this Annual Report. Our ADSs have been listed on the NYSE under the symbol “UMC” since September 19, 2000. In 2021, we were ranked among the top 5% of companies for a seventh consecutive year in the Corporate Governance Evaluation conducted by the Taiwan Stock Exchange and Taipei Exchange. The assessment was conducted across over 1,400 public companies in Taiwan.

We are one of the world’s largest independent semiconductor foundries and a leader in semiconductor manufacturing process technologies. Our primary business is the manufacture, or “fabrication”, of semiconductors, sometimes called “chips” or “integrated circuits”, for others. Using our own proprietary processes and techniques, we make chips to the design specifications of our many customers. Our company maintains a diversified customer base across industries, including communication devices, consumer electronics, computer, and others, while continuing to focus on manufacturing for high growth, large volume applications, including networking, telecommunications, internet, multimedia, PCs and graphics. We sell and market mainly wafers which in turn are used in a number of different applications by our customers. The following table presented the percentages of our wafer sales by application for the years ended December 31, 2019, 2020 and 2021.

	Years Ended December 31,
Application	2019		2020		2021
	%		%		%
Communication		52.2		52.1		46.2
Consumer		26.4		24.3		26.6
Computer		13.6		13.9		16.7
Others		7.8		9.7		10.5
Total		100.0		100.0		100.0

We focus on the development of leading manufacturing process technologies designed for mass production. We were among the first in the foundry industry to enter into commercial operation with such advanced capabilities as producing integrated circuits with line widths of 0.25, 0.18, 0.15, 0.13 micron and 90, 65/55, 45/40, 28, 22 and 14 nanometer. The arrival of 5G technologies have increased the penetration rate in smartphones, wearables, and other devices associated with the Internet of Things which will spur a new wave of semiconductor related applications driving long term silicon content and wafer demand. More powerful semiconductors are required to drive multimedia functions (e.g., processing visual data) and to resolve network bandwidth issues. At the same time, the trend towards portable personal electronic devices have resulted in products that are becoming physically smaller and consuming less power. Process technology must also have the ability to shrink form factors of products aggressively to cater to this trend. Such technology must demonstrate the ability to integrate multiple functions, reduce the size of components needed for operation and lower IC power consumption. Dedicated semiconductor foundries need to achieve this process improvement and at the same time develop multiple process technologies to satisfy varying needs of communication, consumer and computer products. We believe our proprietary process technologies will enable us to continue to offer our customers significant performance benefits for their products, faster time-to-market production, cost savings and other competitive advantages.

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We provide high quality service based on our performance. In today’s marketplace, we believe it is important to make available not only the most effective and flexible processes, but also the best solutions to enable customers to design integrated circuits capable of incorporating entire systems on a chip. Through these efforts, we intend to be the foundry solution for SoC customer needs. To achieve this goal, we believe it is necessary to timely develop and offer the IP and design support that customers need to ensure their specific design blocks function seamlessly with the other design blocks of the integrated circuit system in the manner intended. Accordingly, we have a dedicated IP and design support team that focuses on timely development of IP and processes specifically designed for our customers in order to ensure products that operate and perform as intended. Our design service team actively cooperates with our customers and vendors to identify, early in the product/market cycle, the offerings needed to ensure that our coordinated offerings are available in a streamlined and easy-to-use manner. This ensures the timely delivery of service offerings from the earliest time in the customer design cycle, resulting in a shorter time-to-volume production. We also provide our customers with real-time online access to production data and specifications, resulting in superior communication and efficiency. We further address our customers’ needs using our advanced technology and proven methodology to achieve fast cycle time, high yield, production flexibility and close customer communication. For example, we select and configure our clean rooms and equipment and develop our processes to maximize the flexibility in meeting and adapting to rapidly changing customer and industry needs. As a result, we believe that our cycle time, or the period from customer order to wafer delivery, and our responsiveness to customer request changes are among the fastest in the dedicated foundry industry. We believe our leading technology and high volume capability is a major competitive advantage.

Our technology and service have attracted two principal types of foundry industry customers: fabless design companies and integrated device manufacturers. Fabless design companies design, develop and distribute proprietary semiconductor products but do not maintain internal manufacturing capacity. Instead, these companies depend on third party manufacturing sources. Integrated device manufacturers, in contrast, generally have integrated internally some or all functions—manufacturing as well as design, development, sales and distribution.

Our primary customers, in terms of our sales revenues, include premier integrated device manufacturers, such as Texas Instruments and Intel Mobile, plus leading fabless design companies, such as MediaTek, Realtek, Qualcomm and Novatek. In 2021, our company’s top ten customers accounted for 54.5% of our operating revenues. We believe our success in attracting these customers is a direct result of our commitment to high quality service and our intense focus on customer needs and performance.

In 2014, we and Fujitsu Semiconductor Limited, or Fujitsu, announced a joint venture agreement where we invested ¥5 billion as an initial investment and received approximately 9.3% of the issued and outstanding share capital to become a minority shareholder of a newly formed subsidiary of Fujitsu named Mie Fujitsu Semiconductor Limited, or MIFS, which will operate a 300mm wafer manufacturing facility located in Kuwana, Mie, Japan. In 2015, we increased our ownership interest in MIFS to approximately 15.9% by making an additional capital investment of NT$1.36 billion. Through this relationship with us, MIFS was able to expand its business globally as a pure-play foundry company by strengthening its production and development capacity in a cost competitive manner. On June 29, 2018, our board approved the acquisition of the remaining 84.1% in MIFS from Fujitsu and the transaction was completed on October 1, 2019 at a consideration of JPY¥54.4 billion. Upon completion of the transaction, MIFS became one of our wholly-owned subsidiaries and was renamed “United Semiconductor Japan Corporation”, or USJC. We believe the acquisition of USJC aligns with our growth strategy which prioritizes on differentiating process technologies to fulfill the growing market demand across logic and specialty markets, and the acquisition provided us with an enhanced capability to gain market share in key geographical areas, including Japan. The 300mm fab based in Japan provides a capacity of approximately 36,500 per month, specializing in the manufacturing of 90nm, 65nm and 40nm products.

In 2014, we established United Semiconductor (Xiamen) Co., Ltd., or USCXM, based in Xiamen, Fujian Province, China that focuses on 12-inch wafer foundry services. USCXM manufactures 12-inch wafers and offer 28 nanometer, 40 nanometer and 55 nanometer process technologies. We obtained the initial investment approval from the R.O.C. government on December 31, 2014 with US$300 million invested by HJ (Hejian Technology Suzhou) and US$450 million by UMC. The initial groundbreaking event of USCXM took place in March 2015 and the grand opening ceremony took place in November 2016. In November 2017, we obtained approval from the R.O.C. government for a US$600 million capital investment in USCXM which was completed in September 2018. USCXM successfully commenced commercial mass production by the end of 2016 and has carried out production on both 40nm and 28nm technology nodes in 2017. On February 11, 2020, our subsidiary HeJian Technology’s board of directors approved an investment of US$500 million in USCXM over the next few years. Accordingly, in October 2020, HeJian Technology invested RMB¥1 billion (US$160 million) and RMB¥1 billion (US$143 million) in USCXM in October 2020 and in October 2021, respectively. Our participation in USCXM complies with R.O.C. rules and regulations and will be subject to the review and approval by the relevant R.O.C. authorities.

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On December 24, 2014, we transferred our 6-inch fabrication plant, or Fab 6A, including machinery equipment and building facilities to our subsidiary, Wavetek Microelectronics Corporation, or Wavetek, in order to further satisfy customer needs in the fast growing GaAs market and to improve the 6-inch fabrication operational efficiency among our group by fully utilizing the existing assets and resources. In April 2015, Wavetek had successfully entered into the silicon-based CMOS foundry business after it had fully acquired our 6-inch Fab 6A fixed assets and production lines. As of March 31, 2022, we held approximately 80.17% of issued and outstanding equity of Wavetek, making us its largest shareholder.

On December 31, 2018, we acquired the remaining equity interest in Best Elite International Limited, a British Virgin Islands corporation, or Best Elite, and our cumulative ownership in Best Elite became 100% as a result. Best Elite is a holding company that has 100% ownership of HeJian Technology.

Please refer to “Item 5. Operating and Financial Review and Prospects—B. Liquidity and Capital Resources” for a discussion of our capital expenditures in the past three years and the plan for the current year.

On April 25, 2018, to further integrate the resources pursuant to our investment strategy, our board and the board of our subsidiaries, Fortune Venture Capital Corp. or FORTUNE, and UMC New Business Investment Corp., or NBI, approved an organizational restructure plan, under which NBI will be merged into FORTUNE. FORTUNE is the surviving company and assumes all the assets and liabilities from NBI when the merger became effective on July 1, 2018.

On October 30, 2019, FORTUNE made a one-time private placement investment in Taiwan Semiconductor Company by paying a consideration of approximately NT$300 million for the purchase of 6,741,000 shares in Taiwan Semiconductor Company at a unit price of NT$44.50.

On January 15, 2021, we sold all 4,000,000 common shares of Hut 8 Mining Corporation with a total consideration of approximately NT$310 million at average unit price of NT$77.54. On April 28, 2021, our board approved the private placement investment in TGVest Asia Partners II(Taiwan), L.P. by paying no more than NT$1,200 million. According to Limited Partnership Agreement, capital contributions will be made by capital call notices.

On September 3, 2021, our board and the Boards of Directors of FORTUNE and Chipbond Technology Corporation, or Chipbond, approved the proposal of a share exchange transaction in accordance with Article 156-3 of the Company Law. Under this proposal, Chipbond’s capital increased by the issuance of 67,152,322 new ordinary shares in exchange for 61,107,841 new common shares issued by us and 16,078,737 common shares of UMC held by FORTUNE. The share exchange ratio was one UMC common share to 0.87 ordinary share of Chipbond. After the completion of the share exchange transaction, UMC and FORTUNE jointly hold approximately 9.09% of the equity in Chipbond, and Chipbond hold approximately 0.62% of the equity in UMC. Following the issuance and exchange of new shares, UMC and Chipbond will establish a long-term strategic partnership.

Our Strategy

To maintain and enhance our position as a market leader, we have adopted a business strategy with a focus on a partnership business model designed to accommodate our customers’ business needs and objectives and to promote their interests as our partners. We believe that our success and profitability are inseparable from the success of our customers. The goal in this business model is to create a network of partnerships and alliances among integrated device manufacturers, IP and design houses, as well as foundry companies. We believe that we and our partners will benefit from the synergy generated through such long-term partnerships or alliances and the added value to be shared among the partners. The key elements of our strategy are:

Operate as a Customer-Driven Foundry. We plan to operate as a customer-driven foundry. The increasing complexity of 40 nanometer, 28 nanometer, and more advanced technologies has impacted the entire semiconductor industry, as ICs can now be designed with greater gate density and higher performance while incorporating the functions of an entire system on a single chip. These designs have created a new market of 5G communications, AIoT, automotive as well as , the increase of silicon content per device. We collaborate closely with our customers as well as partners throughout the entire supply chain, including equipment, electronic design automation tool and IP vendors to work synergistically toward each customer’s SoC solution. We also possess experience and know-how in system design and architecture to integrate customer designs with advanced process technologies and IP. We believe the result is a higher rate of first-pass silicon success for our SoC solutions. Our customer-driven foundry solutions begin with a common logic-based platform, where designers can choose the process technologies and transistor options that best fit their specific application. From there, technologies such as radio frequency complementary metal-oxide-semiconductor, or RF CMOS, and embedded Flash memories can be used to further fine-tune the process for customers’ individual needs. Furthermore, as IP has become critical resources for SoCs, our portfolio includes basic design building blocks as well as more complex IP of optimized portability and cost, developed both internally and by third-party partners. With advanced technology, a broad IP portfolio, system knowledge and advanced 300-millimeter manufacturing, we offer comprehensive solutions that help customers deliver successful results in a timely fashion.

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Build up Customer-focused Partnership Business Model. We have focused on building partnership relationships with our customers, and we strive to help our customers achieve their objectives through close cooperation. Unlike the traditional buy-and-sell relationship between a foundry and its customers, we believe our partnership business model will help us understand our customers’ requirements and, accordingly, better accommodate our customers’ needs in a number of ways, such as customized processes and services that optimize the entire value chain (not just the foundry portion) and IP-related support. We believe that this business model will enable us to deliver our products to our customers at the earliest time our customers require for their design cycle, resulting in shorter time-to-market and time-to-volume production. Furthermore, we believe we will provide more cost-effective services by focusing our research and development expenditures on the specific requirements of our customers. We believe our partnership business model will help us not only survive a market downturn, but also achieve a better competitive position.

Continue to Focus on High Growth Applications and Customers and Actively Explore New Market Opportunities. We believe one measure of a successful foundry company is the quality of its customers. We focus our sales and marketing on customers who are established or emerging leaders in industries with high growth potential. Our customers include industry leaders such as Intel Mobile, MediaTek, Realtek, Texas Instruments and Qualcomm. We seek to maintain and expand our relationships with these companies. We strive to demonstrate to these customers the superiority and flexibility of our manufacturing, technology and service capabilities and to provide them with production and design assistance. We are also making efforts to further diversify our customer portfolio in order to maintain a balanced exposure to different applications and different customers. We believe these efforts strengthen our relationships with our customers and enhance our reputation in the semiconductor industry as a leading foundry service provider.

In addition to customer diversification, we have also been actively exploring new market opportunities in consumer electronics such as Internet of Things.

Maintain Our Leading Position in Mass-Producible Semiconductor Technology and Selectively Pursue Strategic Investments in New Technologies. We believe that maintaining and enhancing our leadership in mass-producible semiconductor manufacturing technology is critical to attract and retain customers. Our reputation for technological excellence has attracted both established and emerging leaders in semiconductor industries who work closely with us on technology development. In addition, we believe our superior processing expertise has enabled us to provide flexible production schedules to meet our customers’ particular needs. We plan to continue enhancing capital expenditures in research and development and building internal research and development expertise, to focus on logic and specialty process development to accelerate access to next-generation and specialized technologies. Our continuous technology development efforts and capital investment have allowed us to acquire new customers and opportunities, which enabled us to grow our business. We believe our progress in developing more advanced process technologies has benefited our customers in the fields of computers, communications, consumer electronics and others with special preferences in certain aspects of the products, such as the ultimate performance, density and power consumption.

Moreover, we expect to strengthen our leading position and increase our market share by licensing our technologies to several corporate partners. For example, in 2014, we licensed to MIFS, which is a pure-play foundry company, our advanced 40 nanometer technology under a technology transfer and license agreement. On October 1, 2019, MIFS, which was renamed as USJC, became one of our wholly-owned subsidiaries through the acquisition of equity interest. We will continue to explore licensing opportunities based on our comprehensive technology offerings to further drive our revenue. In addition, we also entered into an agreement with the Xiamen Municipal People’s Government and Fujian Electronics & Information Group in 2014 in connection with the newly established USCXM located in Xiamen, Fujian Province, China, which is focusing on the manufacturing of 12-inch wafers with initial offering of 40 nanometer and 55 nanometer process technologies. In April 2017, we entered into a license agreement with USCXM to provide 28 nanometer process technologies aimed to further strengthen the wafer manufacturing capabilities of our subsidiary company.

We also recognize that every company has limited resources and that the foundry industry is ever-evolving. Accordingly, we believe we should invest in new research and development technology intelligently and in a cost-effective manner to achieve the ultimate output of the resulting technology. In doing so, we balance the rate of return of our research and development with the importance of developing a technology at the right time to enhance our competitive edge without unduly diluting our profitability. We intend to avoid investments in technologies that do not present a commercial potential for volume production. We believe that to develop the earliest and most advanced semiconductor technology without regard to its potential for near term volume production may prove costly to our operations and would not strengthen our competitive position. We perceive a benefit to defer investment in the premature equipment needed to claim the earliest advanced technology and instead to purchase a more advanced and less expensive version of equipment from vendors who design such equipment based on pre-production lessons learned from the earliest technology.

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Maintain Scale and Capacity Capabilities to Meet Customer Requirements, with a Focus on 12-inch Wafer Facilities for Future Expansion. We believe that maintaining our foundry capacity with advanced technology and facilities is critical to the maintenance of our industry leadership. Our production capacity is currently among the largest of all semiconductor foundries in the world. We intend to increase our 12-inch wafer production capacity to meet the needs of our customers and to fully capitalize on the expected growth of our industry. We expect our future capacity expansion plans will focus on 12-inch wafer facilities in order to maintain our technology leadership. 12-inch wafers offer manufacturing advantages over 8-inch wafers due to, among other reasons, the greater number of chips on each wafer and the advantages only offered on newer 12-inch capable equipment. In addition, 12-inch wafer facilities present a more cost-effective solution in achieving an economic scale of production. We intend to carefully monitor current market conditions in order to optimize the timing of our capital spending. We also plan to continue to expand our capacity and capabilities to meet customer requirements in different markets and expand our global presence by making strategic investments in other companies. For example, in 2014, we invested in MIFS in Japan with Fujitsu Semiconductor Limited and in USCXM in China with the Xiamen Municipal People’s Government and Fujian Electronics & Information Group that focus on manufacturing semiconductors using 12-inch wafers. These investments enable us to achieve a greater economy of scale with respect to 300mm wafer operations for advanced node process technologies. We also licensed our advanced technologies to these invested companies in order to provide feasible technology solutions to fulfill their needs. On October 1, 2019, we acquired all the remaining equity interest in MIFS from Fujitsu Semiconductor Limited. As such, MIFS became one of our wholly-owned subsidiaries and was renamed as USJC.

B. Business Overview

Manufacturing Facilities

To maintain a leading position in the foundry business, we have placed great emphasis on achieving and maintaining a high standard of manufacturing quality. As a result, we seek to design and implement manufacturing processes that produce consistent, high manufacturing yields to enable our customers to estimate, with reasonable certainty, how many wafers they need to order from us. In addition, we continuously seek to enhance our production capacity and process technology, two important factors that characterize a foundry’s manufacturing capability. Our large production capacity and advanced process technologies enable us to provide our customers with volume production and flexible and quick-to-market manufacturing services. All of our fabs operate 24 hours per day, seven days per week. Substantially all maintenance at each of the fabs is performed concurrently with production.

The following table sets forth operational data of each of our manufacturing facilities as of December 31, 2021.

Wavetek

Fab 8A

Fab 8C

Fab 8D

Fab 8E

Fab 8F

Fab 8S

Fab 8N

Fab 12A

Fab 12i

Fab 12X

Fab 12M

Commencement of volume production

1989

1995

1998

2000

1998

2000

2000

2003

2002

2004

2016

2005

Estimated full capacity (1)(2)

27,113

63,200

38,400

31,800

38,200

45,500

34,100

77,200

90,372

54,807

26,000

36,500

wafers per month

wafers per month

wafers per month

wafers per month

wafers per month

wafers per month

wafers per month

wafers per month

wafers per month

wafers per month

wafers per month

wafers per month

Wafer size

6-inch

8-inch

8-inch

8-inch

8-inch

8-inch

8-inch

8-inch

12-inch

12-inch

12-inch

12-inch

(150mm)

(200mm)

(200mm)

(200mm)

(200mm)

(200mm)

(200mm)

(200mm)

(300mm)

(300mm)

(300mm)

(300mm)

(1) Measured in stated wafer size.

(2) The capacity of a fab is determined based on the capacity ratings given by manufacturers of the equipment used in the fab, adjusted for, among other factors, actual output during uninterrupted trial runs, expected down time due to set up for production runs and maintenance and expected product mix.

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Our fabs are located in the R.O.C., Singapore, PRC and Japan. The following table sets forth the size and primary use of our facilities and whether such facilities, including land and buildings, are owned or leased. The land in the Hsinchu and Tainan Science Parks is leased from the R.O.C. government. The land in the Pasir Ris is leased from statutory boards of the Singapore government. The land in the Suzhou Industrial Park and Xiang’an District is leased from the PRC government.

Location	Size (Land/Building)	Primary Use	Land (Owned or Leased)	Building (Owned or Leased)
	(in square meters)
Fab 8A, 3, 5 Li-Hsin 2nd Rd., Hsinchu Science Park, Hsinchu, Taiwan 30078, R.O.C.	43,130 / 83,699	8-inch wafer production	Leased (expires in December 2033)	Owned
Fab 8C & Fab 8D, 6, 8 Li-Hsin 3rd Rd., Hsinchu Science Park, Hsinchu, Taiwan 30078, R.O.C.	33,784/100,609	8-inch wafer production	Leased (expires in December 2033)	Owned
Fab 8E, 17 Li-Hsin Rd., Hsinchu Science Park, Hsinchu, Taiwan 30078, R.O.C.	35,779 / 76,315	8-inch wafer production	Leased (expires in February 2036)	Owned
Fab 8F, 3 Li-Hsin 6th Rd., Hsinchu Science Park, Hsinchu, Taiwan 30078, R.O.C.	23,774 / 65,736	8-inch wafer production	Leased (expires in February 2038)	Owned
Fab 8S, 16 Creation 1st Rd., Hsinchu Science Park, Hsinchu, Taiwan 30077, R.O.C.	20,365 / 65,614	8-inch wafer production	Leased (expires in December 2023)	Owned
Fab 8N, 333, Xinghua St., Suzhou Industrial Park, Suzhou, Jiangsu Province 215025, PRC	215,621 /100,908	8-inch wafer production	Leased (expires in December 2052)	Owned
Fab 12A, 18, 20 Nan-Ke 2nd Rd., & 57, Nan-ke 3rd Rd., Tainan Science Park, Sinshih Tainan, Taiwan 74147, R.O.C.	243,250 / 633,904	12-inch wafer production	Leased (expires in November 2034)	Owned
Fab 12i, 3 Pasir Ris Drive 12 Singapore 519528	86,007 / 146,509	12-inch wafer production	Leased (expires in March 2031)	Owned
Fab 12X, 899 Wan Jia Chun Road, Xiang’an District, Xiamen, Fujian Province, PRC	254,698 / 348,537	12-inch wafer production	Leased (expires in January 2065)	Owned
Fab 12M, 2000, Mizono, Tado-cho, Kuwana, Mie, 511-0118, Japan	307,293 / 151,753	12-inch wafer production	Owned	Owned
United Tower, 3 Li-Hsin 2nd Rd., Hsinchu Science Park, Hsinchu, Taiwan 30078, R.O.C.	8,985 / 85,224	Administration office	Leased (expires in December 2033)	Owned
Neihu Rd. office, 8F, 68. Sec. 1, Neihu Rd., Taipei, Taiwan 11493, R.O.C.	626 / 4,817	Administration office	Owned	Owned
Testing Building, 1, Chin-Shan, 7th St., Hsinchu, Taiwan 30080, R.O.C.	10,762 /41,318	Leased to several companies	Owned	Owned
R&D Building, 18 Nan-Ke 2nd Rd., Tainan Science Park, Sinshih, Tainan, Taiwan 74147, R.O.C.	42,000 / 47,396	Research and development	Leased (expires in December 2023)	Owned

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Location	Size (Land/Building)	Primary Use	Land (Owned or Leased)	Building (Owned or Leased)
	(in square meters)
Wavetek, 10, Chuangxin 1st Rd., Hsinchu Science Park, Baoshan Township, Hsinchu, Taiwan 30076, R.O.C.	27,898 / 34,609	6-inch wafer production	Leased (expires in December 2034)	Owned

Process Technology

Process technology is a set of specifications and parameters that we implement for manufacturing the critical dimensions of the patterned features of the circuitry of semiconductors. Our process technologies are currently among the most advanced in the foundry industry. These advanced technologies have enabled us to provide flexible production schedules to meet our customers’ particular needs.

We pioneered the production of numerous semiconductor products. Our continued enhancement of our process technologies has enabled us to manufacture semiconductor devices with smaller geometries. In 2013, we successfully developed and released into production 28nm Poly-SiON and High-k/metal gate technologies. In 2015, we provided a High-k/ metal gate with high performance compact, or HPC, solution and improved to a high performance compact plus, or HPC+, solution by the end of 2017 for speed-intensive and optimized power consumption products. We and Cadence Design Systems collaborate on certification of analog/mixed-signal flow for 28HPC+ process. Certification enables customers to leverage the integrated, comprehensive AMS solution to facilitate accelerated designs on our most advanced 28nm node. In 2018, we developed 22nm ULP (ultra-Low Power) and ULL (ultra-Low Leakage) technology to provide cost effective solutions and to obtain better chip performance for IoT applications. We also joined the IBM chip alliance, for advanced process development. With IBM’s know-how and support, we aim to continue to improve our internally developed 14nm FinFET technology, so as to offer a 14nm competitive low-power enhanced technology for mobile computing and communication products. In March 2017, we commenced the shipment of 14nm wafers to customers and have achieved production quality yields for the advanced process that is being utilized for consumer electronic applications. UMC’s 14nm FinFET technology features 55% higher speed and twice the gate density over 28nm process technology. The 14nm process also consumes approximately 50% less power than for 28nm. We also partnered with Avalanche for joint development and production of MRAM to replace embedded flash in 2018 for 22nm technologies.

Our 22nm technology readiness follows silicon validation on world’s smallest USB 2.0 test vehicle. The latest specialty process offering provides competitive performance and a seamless migration path from 28nm to 22nm. We are offering a 22uLP version that has compatible design rules and the same mask count at the foundry’s 28nm technology, and also a 22uLL version. UMC 22uLP and 22uLL form a super set to support a voltage domain from 1.0V to 0.6V, allowing customers to enjoy the benefits of both technologies on system-on-chip (SoC) designs. The 22nm platform is supported by our foundation IP and is ideal for a wide variety of semiconductor applications including consumer ICs for set top box, digital TV, surveillance, power or leakage sensitive IoT chips (with Bluetooth or WiFi) and wearable products that require longer battery life.

Furthermore, we have also successfully developed specialty technologies such as 55/40/28nm embedded memory used for MCU and automotive products, 55/40/28nm embedded high voltage device used for display drivers, 55nm BSI-CSI for image sensors and 110/55nm BCD for power management circuits. We also developed ReRAM for advanced node embedded solutions, and RF-SOI technologies of 110/90/55nm nodes covering both custom and platform for RF device applications. All of these specialty technologies can provide system on chip solutions.

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The table below sets forth our actual process technology range, categorized by line widths, or the minimum physical dimensions of the transistor gate of integrated circuits in production by each fab in 2021, and the estimated annual full capacity of each fab, actual total annual output and capacity utilization rates in 2019, 2020 and 2021:

		Year Ended December 31, 2021 Range of		Years Ended December 31,
	Years of	Process		2019			2020			2021
	Commencement of Operation	Technologies (in microns)		(in thousands of 8-inch wafer equivalents, except percentages)
Wavetek	1989		5 to 0.25		208			209			185
Fab 8A	1995		3 to 0.18		825			802			755
Fab 8C	1998		0.35 to 0.11		436			452			459
Fab 8D	2000		0.18 to 0.09		359			371			380
Fab 8E	1998		0.6 to 0.15		426			449			457
Fab 8F	2000		0.18 to 0.11		434			485			514
Fab 8S	2000		0.25 to 0.11		372			373			408
Fab 8N	2003		0.5 to 0.11		831			917			917
Fab 12A	2002		0.13 to 0.014		2,243			2,348			2,408
Fab 12i	2004		0.13 to 0.040		1,338			1,414			1,442
Fab 12X	2016		0.080 to 0.022		457			489			639
Fab 12M	2005		0.13 to 0.040		220			879			889
Total estimated capacity	—		—		8,148			9,188			9,453
Total output (actual)	—		—		7,227			8,902			9,871
Average capacity utilization	—		—		88.7	%		96.9	%		104.4	%

Capacity and Utilization

The fabs in Taiwan that we own directly are named Wavetek, Fab 8A, Fab 8C, Fab 8D, Fab 8E, Fab 8F, Fab 8S and Fab 12A. All of them are located in the Hsinchu Science Park except for Fab 12A located in the Tainan Science Park. The fab in Singapore is named Fab 12i. The fabs in China are named Fab 8N and Fab 12X, located in Suzhou and Xiamen, respectively. The fab in Japan is named Fab 12M located in Mie.

Our average capacity utilization rate was 88.7% in 2019, 96.9% in 2020 and 104.4% in 2021.

Equipment

Because the performance and productivity of our manufacturing capability depends substantially on the quality of our capital equipment, we generally purchase equipment that not only meet the demand of our existing process technology, but also have the capability to be upgraded to match our future needs. The principal equipment we use to manufacture semiconductor devices are scanners/steppers, cleaners and track equipment, inspection equipment, etchers, furnaces, wet stations, strippers, implanters, sputters, CVD equipment, probers, testers and so on. We own all of the production equipment except for a few demonstration tools.

Our policy is to purchase high-quality equipment that demonstrates stable performance from vendors with dominant market share to ensure our continued competitiveness in the semiconductor field.

Some of the equipment is available from a limited number of qualified vendors and/or is manufactured in relatively limited quantities, and some equipment has only recently been developed. We believe that our relationships with equipment suppliers are strong enough that we can leverage our position as a major purchaser to purchase equipment on competitive terms.

Although we face the challenge of procuring the right equipment in sufficient quantity necessary for ramp-up or expansion of our fabrication facilities under constraint of short lead times, we have not in the past experienced any material problems in procuring the latest generation equipment on a timely basis even in periods of unpredictably high market demand. We manage the risks in the procurement process through timely internal communications among different divisions, efficient market information collection, early reservation of appropriate delivery slots and constant communications with our suppliers as well as by utilizing our good relationships with the vendors.

Raw Materials

Our manufacturing processes use many raw materials, primarily silicon wafers, chemicals, gases and various types of precious sputtering targets. These raw materials are generally available from several suppliers. Our policy with respect to raw material purchases, similar to that for equipment purchases, is to select only a small number of qualified vendors who have demonstrated quality and reliability on delivery time of the raw materials. We may have long-term supply contracts with our vendors if necessary.

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Our general inventory policy is to maintain sufficient stock of each principal raw material for production and rolling forecasts of near-term requirements received from customers. In addition, we have agreements with several key material suppliers under which they hold similar levels of inventory in their warehouses for our use. However, we are not under any obligation to purchase raw material inventory that is held by our vendors for our benefit until we actually order it. We typically work with our vendors to plan our raw material requirements on a monthly basis, with indicative pricing generally set on a quarterly basis. The actual purchase price is generally determined based on the prevailing market conditions. In the past, prices of our principal raw materials have not been volatile to a significant degree. Although we have not experienced any shortage of raw materials that had a material effect on our operations, and supplies of raw materials we use currently are adequate, shortages could occur in various critical materials due to interruption of supply or an increase in industry demand.

The most important raw material used in our production processes is silicon wafer, which is the basic raw material from which integrated circuits are made. The principal makers for our wafers are Shin-Etsu, GlobalWafers, Siltronic, Sumco Group and Soitec. We have in the past obtained and believe that we will continue to be able to obtain a sufficient supply of silicon wafers. We believe that we have close working relationships with our wafer suppliers. Based on such long-term relationships, we believe that these major suppliers will use their best efforts to accommodate our demand.

We use a large amount of water in our manufacturing process. We obtain water supplies from government-owned entities. We also use substantial amounts of dual loop electricity supplied by Taiwan Power Company in the manufacturing process. We maintain back-up generators that are capable of providing adequate amounts of electricity to maintain the required air pressure in our clean rooms in case of power interruptions. We believe our back-up devices are reasonably adequate in preventing business interruptions caused by power outages and emergency situations.

Quality Management

We believe that our advanced process technologies and reputation for high quality and reliable services and products have been important factors in attracting and retaining leading international and domestic semiconductor companies as customers.

We structure our quality management system in accordance with the latest international quality standards and our customers’ strict quality and reliability requirements. Our quality management system incorporates comprehensive quality control programs into the entire business flow of foundry operation including, among others, new process development management, production release control, incoming raw material inspection, statistical process control and methodology development, process change management, technical documentation control, product final inspection, metrology tool calibration and measurement system analysis, quality audit program, nonconformity management, customer complaint disposition, eight-discipline problem solving and customer satisfaction monitoring.

We set a high quality goal to ensure consistent high yielding and reliable product performance. Our quality program is continually enhanced through top-down annual Business Policy Management and bottom-up Total Quality Management activities. In addition, our efforts to observe best practices among fabs in the foundry industry have also contributed to the improvement of our overall quality management system.

Many of our customers perform physical production site qualification process in the early development phase and routine quality conformance audits in the volume production phase. These audits include both quality system review and physical fabrication area inspection for verification of conformity with the international quality standard and customers’ quality requirement. Our quality management system and quality control programs have been qualified and routinely audited by numerous customers who are recognized as world-class semiconductor companies with best-in-class quality standards.

Our Quality Assurance Division and Reliability Technology and Assurance Division collaborate to provide quality and reliability performance to customers. With our wafer processing quality and reliability conformance monitoring program, we monitor the product quality and reliability at various stages of the entire manufacturing process before shipment to customers.

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All our fabs are certified in compliance with IATF 16949 and QC080000 IECQ HSPM standards. IATF 16949 sets the criteria for developing a fundamental quality management system emphasizing on customer satisfaction in quality management, continual improvement, defect prevention and variation and waste reduction. QC080000 IECQ HSPM sets the criteria for developing a process management system for hazardous substances and focuses on developing environmentally friendly manufacturing processes. We are committed to continuously improve our quality management system and to deliver high quality product to our customers.

Services and Products

We primarily engage in wafer fabrication for foundry customers. To optimize fabrication services for our customers, we work closely with them as they finalize circuit design and contract for the preparation of masks to be used in the manufacturing process. We also offer our customers turnkey solutions by providing subcontracted assembly and test services. We believe that this ability to deliver a variety of foundry services in addition to wafer fabrication enables us to accommodate the needs of a full array of integrated device manufacturers, system companies and fabless design customers with different in-house capabilities.

Wafer manufacturing requires many distinct and intricate steps. Each step in the manufacturing process must be completed with precision in order for finished semiconductor devices to work as intended. The processes require taking raw wafers and turning them into finished semiconductor devices generally through five steps: circuit design, mask tooling, wafer fabrication, assembly and test. The services we offer to our customers in each of these five steps are described below.

Circuit Design. At this initial design stage, our engineers generally work with our customers to ensure that their designs can be successfully and cost-effectively manufactured in our facilities. We have assisted an increasing number of our customers in the design process by providing them with access to our partners’ electronic design analysis tools, IP and design services, as well as by providing them with custom embedded memory macro-cells. In our Silicon Shuttle program, we offer customers and IP providers early access to actual silicon samples with their desired IP and content in order to enable early and rapid use of our advanced technologies. The Silicon Shuttle program is a multi-chip test wafer program that allows silicon verification of IP and design elements. In the Silicon Shuttle program, several different vendors can test their IP using a single mask set, greatly reducing the cost of silicon verification for us and the participating vendors. In our alliances with them, we coordinate with leading suppliers of IP, design and ASIC services to ensure their offerings are available to our customers in an integrated, easy to use manner which matches customers’ need to our technologies. With a view to lowering customer design barriers, we expanded our design support functions from conventional design support to adding IP development to complement third-party intellectual properties and to provide customers with the widest range of silicon-verified choices. Our offerings range from design libraries to basic analog mixed-mode intellectual properties which, together, have helped shorten our customer’s design cycle time.

Mask Tooling. Our engineers generally assist our customers to design and/or obtain masks that are optimized for our advanced process technologies and equipment. Actual mask production is usually provided by independent third parties specializing in mask tooling.

Wafer Fabrication. As described above, our manufacturing service provides all aspects of the wafer fabrication process by utilizing a full range of advanced process technologies. During the wafer fabrication process, we perform procedures in which a photosensitive material is deposited on the wafer and exposed to light through the mask to form transistors and other circuit elements comprising of a semiconductor. The unwanted material is then etched away, leaving only the desired circuit pattern on the wafer. As part of our wafer fabrication services, we also offer wafer probing services, which test, or probe, individual die on the processed wafers and identify dice that fail to meet required standards. We prefer to conduct wafer probing internally to obtain speedier and more accurate data on manufacturing yield rates.

Assembly and Testing. We offer our customers turnkey solutions by providing the option to purchase finished semiconductor products that have been assembled and tested. We outsource assembly and test services to leading assembly and test service providers, including Siliconware Precision Industries Co., Ltd., or Siliconware, and Advanced Semiconductor Engineering Inc. in Taiwan. After final testing, the semiconductors are shipped to our customers’ designated locations.

Customers and Markets

Our primary customers, in terms of our sales revenues, include premier integrated device manufacturers, such as Texas Instruments and Intel Mobile, plus leading fabless design companies, such as MediaTek, Realtek, Qualcomm and Novatek. Although we are not dependent on any single customer, a significant portion of our operating revenues has been generated from sales to a few customers. Our top ten customers accounted for approximately 54.5% of our operating revenues in 2021.

Set forth below is a geographic breakdown of our operating revenues in 2019, 2020 and 2021 by the location of our customers.

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	Years Ended December 31,
Region	2019		2020		2021
	%		%		%
Taiwan		36.4		36.8		37.9
Singapore		16.2		14.7		13.7
China (including Hong Kong)		12.9		12.8		14.6
Japan		6.6		8.7		6.4
USA		13.5		13.9		11.4
Europe		4.7		3.6		2.6
Others		9.7		9.5		13.4
Total		100.0		100.0		100.0

We believe our success in attracting these end customers is a direct result of our commitment to high quality service and our intense focus on customer needs and performance. As an independent semiconductor foundry, most of our operating revenue is generated by our sales of wafers. The following table presented the percentages of our wafer sales by types of customers for the years ended December 31, 2019, 2020 and 2021.

	Years Ended December 31,
Customer Type	2019		2020		2021
	%		%		%
Fabless design companies		91.3		87.8		85.4
Integrated device manufacturers		8.7		12.2		14.6
Total		100.0		100.0		100.0

We focus on providing a high level of customer service in order to attract customers and maintain their ongoing loyalty. Our culture emphasizes responsiveness to customer needs with a focus on flexibility, speed and accuracy throughout our manufacturing and delivery processes. Our customer-oriented approach is especially evident in two types of services: customer design development services and manufacturing services. We believe that our large production capacity and advanced process technology enable us to provide better customer service than many other foundries through shorter turn-around time, greater manufacturing flexibility and higher manufacturing yields.

We work closely with our customers throughout the design development and prototyping processes. Our design support team closely interacts with customers and IP vendors to facilitate the design process and to identify their specific requirements for IP offerings. We are responsive to our customers’ requirements in terms of overall turn-around time and production time-to-market by, for example, helping our customers streamline their IP offering processes and delivering prototypes in a timely and easy-to-use fashion. We also maintain flexibility and efficiency in our technical capability and respond quickly to our customers’ design changes.

For IP offerings, we work with several leading IP vendors from digital, memory and analog fields in the semiconductor industry to deliver quality IP blocks that have been silicon validated using our advanced processes. Our alliances with major electronic design automation vendors provide our customers with digital/analog reference design procedures and easy-to-use design solutions. By continuously enhancing our IP offerings, reference design procedures and design services through collaboration with major vendors, we aim to provide complete, accurate and user-friendly design solutions to our customers.

As a design moves into manufacturing production, we continue to provide ongoing customer support through all phases of the manufacturing process. The local account manager works with our customer service representative to ensure the quality of our services, drawing upon our marketing and customer engineering support teams as required.

We offer an online service, “MyUMC”, which gives our customers easy access to our foundry services by providing a total online supply chain solution. MyUMC offers 24-hour access to detailed account information such as manufacturing, engineering and design support documents through each customer’s own customized start page. The features that are available to customers through MyUMC include (i) viewing the status of orders from the start of production to the final shipping stages; (ii) designing layouts to shorten customers’ tape out time; (iii) collecting customer engineering requests; (iv) gathering and downloading documents for design purposes; and (v) accessing online in real-time the same manufacturing data used by our fab engineers.

We also have system-to-system connecting services to provide direct data exchange between our system and our customers’ systems. These services, which include our “UMC Design View Room Cloud Service”, facilitate our design collaborations with our customers to help reduce the cost of chip designs and reduce the time to market. In order to continue to improve our information security management, our Information Technology Division received the certification of ISO/IEC 27001:2005 in 2008 and renewed ISO/IEC 27001:2013 in 2015.

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In addition, we have established a data-driven advanced semiconductor smart manufacturing system to provide world-class quality production, ensure information security and service quality, as well as improve customer satisfaction, operational and R&D efficiency. We achieved this by integrating a spectrum of innovative digital technologies, including Internet of Things, big data, cloud, artificial intelligence and information technology, and our enterprise information and semiconductor expertise.

We price our products on a per die or per wafer basis, taking into account the complexity of the technology, the prevailing market conditions, the order size, the cycle time, the strength and history of our relationship with the customer and our capacity utilization. Our main sales office is located in Taiwan, which is in charge of our sales activities in Asia. United Microelectronics (Europe) BV, our wholly-owned subsidiary based in Amsterdam, assists our sales to customers in Europe. Our sales in North America are made through UMC Group (USA), our subsidiary located in Sunnyvale, California. We also have sales offices in China, Japan and Korea to support our customers in those regions.

We advertise in trade journals, organize technology seminars, hold a variety of regional and international sales conferences and attend a number of industry trade fairs to promote our products and services. We also publish a corporate newsletter for our customers.

Information Security Risk Management

We have made information security risk analysis and have taken the mitigating measures as described below:

(1) Risk Management Organization

We have established an Enterprise Risk Management Committee to coordinate with key internal departments for risk management and control, jointly reviewing and managing internal and external risks of the company. In addition, we established the “Corporate Security Division” in 2018, which is responsible for our information security and physical security planning and related audit matters, and work together with our Information Technology Division to further strengthen information security.

(2) Information Security Policy (Internal Control and Protocol)

Our information security policy is based on the guiding principle: “To establish Information Security Management rules in accordance to customer’s requirement, to reach a consensus that information security is everyone’s responsibility through full awareness, to protect information Confidentiality, Integrity, Availability for the Company and Customer, and to provide safe production environment to ensure sustainable operation of the Company’s business.” Our major information security objectives are aimed at antivirus, anti-intrusion and anti-leakage through the building of multiple internal controls such as firewall, intrusion detection and antivirus systems to enhance our ability to defend against external attacks. Also, through regular educational and training programs, security operation/awareness is embedded and seamlessly integrated into every employee’s daily work.

(3) Establish Enterprise Risk Management System

According to the Enterprise Risk Management Committee management procedure, UMC assesses the risk level of information security, takes the appropriate actions and regularly reviews the effectiveness of these actions. The committee regularly reviews the possibility of risk occurrence and the potential change of severity over time to understand and assess the effectiveness of risk management programs and related control operations. We comply with multiple ISO certification standards in the areas of quality, environment, water resources, carbon footprint and green energy. Related information security certification includes ISO15408, ISO22301 and ISO27001.

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(4) Assessment of Information Security and Cyber Risks

We place particular emphasis on preventing information security and cyber risks, and have built a comprehensive multi-layer defense mechanism including firewall, intrusion detection, antivirus system, vulnerability scanning, patch management procedure and penetration testing. Our company followed the National Institute of Standards and Technology to establish a corporate information security framework and created corresponding metrics to strengthen information security management including 1. aiming to further improve the detection of irregularities and elevate preventive capabilities including protocols such as Application Whitelisting and Endpoint Detection and Response, 2. optimize network security area of overall information systems and 3. increase the multi-factor authentication protection for host privileged account login.

(5) Information Security Management System (ISMS) Verification

Our ADRs have been listed on NYSE since 2000 and we had complied with the Sarbanes-Oxley Act (SOX 404) for internal control over financial reporting processes. We also strengthened our information security process by introducing ISO27001 information security management system certification to reduce security risk and production anomaly that may be caused by human error. Continuous improvement of PDCA is then carried out through annual recertification.

In 2014, a cross-division security committee was established. Based on the need to produce secure products like smart card ICs, we introduced ISO15408 (CC, Common Criteria) certification specifically designed for secure production procedures not only in data receiving, processing and destruction but also higher physical access control request for the purpose of securing entire production line. Continuous improvement of PDCA is then carried out through biennial recertification.

(6) Insurance against Information Security Risks

Based on a recent report, data leakage, virus infection, and hacking event in Taiwan and throughout the world, together with the ransomware incident of peer semiconductor manufacturer’s information system in August 2018, have caused significant operating loss in business interruption that reached NT$7.6 billion. There is no guarantee that enterprises will not become the target of attacks despite reasonable security protection in place. In view of this, we obtained cyber security insurance to mitigate and reduce this risk. Such insurance policy has been in effect since January 2019 with retroactive option which can trace back to undiscovered pre-existing threats. The annual insurance coverage is US$10 million for all our fabs in Taiwan, Singapore and Japan.

(7) The Impact of Occurred Major Asset Security Incidents and Response Measures

In response to potential cyber-attacks, we upgraded the antivirus software with behavior-based detection capability and implemented strict information device in/out management, as well as updated critical patches for production line computers to defend against such worm-type viruses that may attack system vulnerabilities. We also set Access Control List (ACL) in production line network to grant necessary access between equipment tools, which can block virus from spreading and minimize its impact. SEMICON TAIWAN subsequently formed a task force to study equipment information security standards, of which we are a member, to contribute as a local enterprise responsibility.

In short, new invasive techniques are constantly evolving but past defense achievements do not necessarily mean or guarantee that anomaly breach will not occur in the future. Enterprises must keep pace with the ever-changing and growing information security threat and requires continuous improvement. UMC will uphold to “Customer-orientation, Integrity, Innovation, Accountability, Efficiency” as corporate culture and will fulfill ‘due care/due diligence’ management responsibility to provide customers with a secure production environment to reduce operational risk and reward shareholders with highest investment value as possible.

Competition

The worldwide semiconductor foundry industry is highly competitive, particularly during periods of overcapacity and inventory correction. We compete internationally and domestically with dedicated foundry service providers as well as with integrated device manufacturers and final product manufacturers which have in-house manufacturing capacity or foundry operations. Some of our competitors have substantially greater production, financial, research and development and marketing resources than we have. As a result, these companies may be able to compete more aggressively over a longer period of time than we can. In addition, several new dedicated foundries have commenced operations and compete directly with us. Any significant increase in competition may erode our profit margins and weaken our earnings.

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We believe that our primary competitors in the foundry services market are Taiwan Semiconductor Manufacturing Company Limited, Semiconductor Manufacturing International (Shanghai) Corporation and Globalfoundries Inc., as well as the foundry operation services of some integrated device manufacturers such as Samsung, Intel and Toshiba. Other competitors such as Dongbu Anam Semiconductor, Hua Hong Semiconductor Manufacturing Corp., X-FAB Semiconductors Foundries AG and Silterra Malaysia Sdn. Bhd. have initiated efforts to develop substantial new foundry capacity, although much of such capacity involves less cost-effective production than the 12-inch fabs for which we possess technical know-how. New entrants in the foundry business are likely to initiate a trend of competitive pricing and create potential overcapacity in legacy technology. The principal elements of competition in the semiconductor foundry industry include technical competence, production speed and cycle time, time-to-market, research and development quality, available capacity, manufacturing yields, customer service and price. We believe that we compete favorably with the new competitors on each of these elements, particularly our technical competence and research and development capabilities.

Intellectual Property

Our success depends on our ability to obtain patents, licenses and other intellectual property (IP) rights covering our production processes and activities. To that end, we have developed and acquired certain patents and patent licenses and intend to continue to seek patents on our production processes. As of December 31, 2021, we held 6,501 U.S. issued patents and 7,922 patents issued outside of the United States.

Our ability to compete also depends on our ability to operate without infringing on the proprietary rights of others. The semiconductor industry is generally characterized by frequent claims and litigation regarding patent and other IP rights. As is the case with many companies in the semiconductor industry, we have from time to time received communications from third parties asserting patents that allegedly cover certain of our technologies and alleging infringement of certain IP rights of others. We expect that we will continue to receive similar communications in the future. Irrespective of the validity or the successful assertion of such claims, we could incur significant costs and devote significant management resources to the defense of these claims, which could seriously harm our company. See “Item 3. Key Information—D. Risk Factors—Our inability to obtain, preserve and defend IP rights could harm our competitive position.”

In order to minimize our risks from claims based on our manufacture of semiconductor devices or end-use products whose designs infringe on others’ IP rights, we in general accept orders only from companies that we believe have established satisfactory reputation and for products that are not identified as risky for potential infringement claims. Furthermore, we obtain indemnification rights from customers. We also generally obtain indemnification rights from equipment vendors to hold us harmless from any losses resulting from any suit or proceedings brought against our company involving allegation of infringement of IP rights on account of our use of the equipment supplied by them.

We have entered into various patent cross-licenses with major technology companies, including a number of leading international semiconductor companies, such as IBM and AVAGO. Our cross licenses may have different terms and expiry dates. Depending upon our competitive position and strategy, we may or may not renew our cross licenses and further, we may enter into different and/or additional technology and/or IP licenses in the future.

Research and Development

In 2019, 2020 and 2021, we spent NT$11,860 million, NT$12,896 million and NT$12,935 million (US$466 million), respectively, on research and development, which represented 8.0%, 7.3% and 6.1% respectively, of our operating revenues of such years. Our research and development efforts mainly focus on delivering comprehensive foundry solutions that consist of the key process technologies encompassing logic as well as specialty manufacturing technologies that address customers’ needs. These resources provide our foundry customers with improved opportunities to develop diverse product lines that supply the global semiconductor market. Our commitment to research and development can be illustrated by our 2021 research and development expenditures, which was approximately 6.1% of operating revenues.

As of December 31, 2021, we employed 1,499 professionals in our research and development activities. In addition, other management and operational personnel are also involved in research and development activities but are not separately identified as research and development professionals.

Our Investments

Our investment holdings consist of equity interest in certain company and reflect current market valuations as these assets may change in accordance with market conditions.

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The following table sets forth the sales of our investments in 2019:

Investees	Number of shares sold (in millions)				Proceeds from disposal (in NT$ millions)
Trilliant Holdings, Inc.		4				279
Dafeng TV Ltd.		2				178
Holtek Semiconductor Inc.		3				168
CTBC Hua Win Money Market Fund		9				100
The following table sets forth the sales of our investments in 2020:
Investees	Number of shares sold (in millions)				Proceeds from disposal (in NT$ millions)
Solar Applied Materials Technology Corp.		8				293
All-Stars XMI Ltd.		0				255
Action Electronics Co., Ltd.		18				241
Playnitride Inc.		1				203
Excellence Optoelectronics Inc.		5				188
The following table sets forth the sales of our investments in 2021:
	Number of shares sold		Proceeds from disposal
Investees	(in millions)		(in NT$ millions)		(in US$ millions)
Octtasia Investment Holding Inc.		4		425		15
Phison Electronics Corp.		1		219		8
CNEX Labs, Inc.		0		170		6
Hut 8 Mining Corp.		1		159		6
Clientron Corp.		8		156		6

Environmental, Safety and Health Matters

UMC implemented extensive ESH management systems since 1996. These systems enable our operations to identify applicable ESH regulations, assist in evaluating compliance status and timely establish loss preventive and control measures. The systems we implemented in all our fabs have been certified as meeting the ISO 14001 and ISO 45001 standards. ISO 14001 consists of a set of standards that provide guidance to the management of organizations to achieve an effective environmental management system. Procedures are established at manufacturing locations to ensure that all accidental spills and discharges are properly addressed. ISO 45001 is an international occupational health and safety management system standard, which may be applied to assess and certify our management systems. Our goal in implementing ISO 14001 and ISO 45001 systems is to continually improve our ESH management, comply with ESH regulations and to be a sustainable green foundry. UMC’s major ESH policies include:

Environmental Protection Aspects:

• We strive to be a sustainable green corporation by complying with or exceed the requirements of environmental laws and international conventions.

• Implement and integrate an environmental management system into the overall organizational management system. Commit to ongoing improvement of environmental performance.

• Take the initiative to introduce and develop environmentally friendly technologies and apply them to R&D, procurement, production operations, business facilities, distribution and logistics, products and services to reduce the environmental load at each stage of the life cycle, achieving the goal of green design, production and operation.

• Focus on the development of environmental trends around the world, assess the involved opportunities and risks, properly carry out waste management and make good use of energy/resources, and promote circular economy.

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• Fulfill corporate social responsibility, and cooperate with the government, the public and global business partners in ecological improvement and rehabilitation.

• Promote environmental education and protection, and improve environmental protection awareness as well as the training of enterprises (employees), subsidiaries (employees), staff from relevant upstream/downstream suppliers, and the general public in order to carry out actions and fulfill their duties.

• Exercise due diligence to encourage subsidiaries, joint venture partners, mergers and acquisitions, outsourcing partners, suppliers, customers and other key business partners to jointly promote environmental sustainability, and consult with shareholders on environmental issues to disclose environmental information.

Safety and Health Aspects:

• Meet or exceed the requirements of industry safety and health laws, aiming for zero disaster. The company is committed to steady development while making safety a priority.

• Continue to promote safety and health management system and risk improvement processes to achieve and maintain world-class safety/health and risk management performance.

• Use advanced safety and health technologies as well as risk and disaster rescue techniques to aggressively enhance all safety aspects in a pioneering manner.

• Implement prevention management and auditing systems to ensure the safety of the work environment and operations, maintaining the physical and mental health of employees.

• Through communication, consultation and participation in decision-making with workers or their representatives, make it a responsibility for personnel of all levels to exercise influence, eliminate hazard factors, prevent occurrence of accidents and work-related illnesses, and promote effective safety and health interactions through cooperation and sharing.

• Continue conducting safety and health education and advocacy; encourage active participation in safety and health activities, allow for health and safety to be a habit and a way of life for all employees.

As a member of the global community and a semiconductor industry leader, we have implemented measures to deal with environmental problems and mitigate climate change. We have introduced green concepts in our operations, including green commitment, management, procurement, production, products, recycling, office, education and marketing.

With respect to safety and health management, we realized that lowering the risks in equipment and processes can reduce accidents, but cannot guarantee the safety of all employees. In order to achieve the goal of “zero-accident”, we intend to promote the concept of “safety is my responsibility”. We have educated employees with the concepts of “be aware of your own safety as well as the safety of others” and “safety is everyone’s responsibility, and my personal accountability.”

Furthermore, we have implemented the FMEA method to foster employees’ capabilities in risk analysis. Therefore, we established a channel for communication to encourage and ensure the employees to fully express their opinions for professional response and assistance. By doing so, we hope to establish a culture of “Safety and health first” to further improve the quality of our working environment, and eventually to become a good example of global safety and health management.

The following list sets forth some of the important awards that we received in environmental protection, safety and health:

• Selected as a member of Dow Jones Sustainability Indices (DJSI) World Index for the fourteenth straight year since 2008 and also named a constituent of Emerging Markets Index in 2021;

• Achieved a Leadership band with ‘A’ score in CDP Water Security assessment and a Management band with score ‘B’ in Climate Change assessment;

• Awarded “Top 10 Taiwanese Companies Sustainability Model Award” 5th place (2021) and “Corporate Sustainability Report Award” (2008-2021) for fourteenth consecutive year by Taiwan Institute for Sustainable Energy;

• Awarded “Excellence in Corporate Social Responsibility” 7th place in large enterprise category by CommonWealth Magazine (2021);

• Awarded “National Enterprise Environmental Protection Award” by the Environmental Protection Administration of Executive Yuan, R.O.C. (2003-2021) for nineteenth consecutive year;

• Awarded “The Best Participation of Green Procurement for Enterprises” by the Environmental Protection Administration of Executive Yuan, R.O.C. (2011-2021);

• Awarded “Excellent Occupational Safety and Health Executive Organization of Hsinchu Science Park” by the Science Park Administration (1998-2021).

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Climate Change

Our climate change policies include: (i) achieving carbon neutral status via carbon management, (ii) becoming a comprehensive low-carbon emissions solution provider, and (iii) leveraging corporate resources to cultivate a low-carbon emissions economy. In order to implement these policies, we set greenhouse gas reduction goals as to various phases. In 2021, we initiated resource and energy productivity improvement plan named “Green 2025” project which target to reduce the usage of water, electricity and waste per unit of product by 15%, 15% and 25%, respectively, compared to 2015. We also set the goal of reducing the F-GHG emissions per unit of product by 65% in 2025 compared to 2010.

In June 2021, we announced our pledge to reach net zero carbon emissions by 2050 and to take concrete steps to Net Zero Action as the first semiconductor foundry globally. UMC is vigorously responding to the Paris Climate Agreement goal and pursuing efforts to limit the global warming not exceeding 1.5°C. In addition, UMC was admitted into RE100, becoming the second semiconductor wafer foundry in this initiative, and committed to use 100% renewable energy by 2050. To reach net zero carbon emissions by 2050, UMC has three resolutions to cover direct emissions from fab operations, indirect emissions from energy consumption, and indirect emissions from value chain. The three resolutions are:

• Persistent and proactive carbon emission reduction: Through continually developing advanced foundry process technologies, enhancing productivity and improving energy efficiency, UMC is able to minimize carbon emissions in both manufacturing stage of wafers and using stage of IC end products.

• 100% renewable energy: A 3-stage objective of 15% by 2025, 30% by 2030, and 100% by 2050 is set to substantially increase the proportion of consuming renewable energy, and UMC will also invite its value chain to support the low-carbon energy transition.

• Investment in net-zero technologies: UMC commits to invest in net zero emissions technologies and participate in Carbon Offset Projects to remove and offset carbon emissions that are inevitable or still subject to technical restrictions.

Since 1999, we have been a pioneer in the foundry industry to implement measures to reduce per-fluorinated compounds, and we completed the replacement of C3F8 with C4F8 in 2011. We have made a significant achievement by reducing F-GHG emissions, which is one of the major greenhouse gas reduction objectives of the World Semiconductor Council. From 2013 to 2014, UMC participated in the Environmental Protection Administration, or the EPA, early reduction project and acquired a carbon reduction allowance of 3.02 million tons. We subsequently executed a contract with Dragon Steel Corporation to trade 2 million tons of carbon emission credits. It was the first trade of carbon emissions credits that was reviewed and recorded by the EPA, indicating a significant milestone in Taiwan’s carbon emission credits trading market. Proceeds derived from the carbon trading transaction was wholly used by us to enforce environmental protection and promote environmental protection measures and to continue contributing towards environmental sustainability. Our GHG Offset Project has passed the Taiwan EPA review in 2020, and through this project, we can build ten years of carbon assets according to our GHG reduction efforts in Taiwan fabs.

We also support timely disclosure of carbon information and ensuring data quality. Since 2006, we have participated in the Carbon Disclosure Project formed by global institutional investors and disclosed our annual greenhouse gas emission volume, reduction goals and results. Moreover, we engage third-party verifiers to ensure the quality of the data. We completed the verification on greenhouse gas emission and reduction records for all of our fabs on an annual basis.

Climate change will not only bring about negative impacts but also drive opportunities for semiconductor simultaneously. Consequently, we have been proactively searching for our own climate related opportunities by considering of market demand for energy-saving and our technique advantages. Our climate change opportunities were identified as green technologies of RF & Power and Logic Related which could reduce the power consumption and carbon emission, and bring double digit percent CAGR (Compound Annual Growth Rate) of revenue in 2023.

Risk Management

Risk and safety matters are administered by our Risk Management and Environmental Safety Health Division, or the GRM & ESH, established in 1998. We are pursuing the goal of a highly protected risk status in the semiconductor industry through the implementation of strict engineering safety procedures, regular enforcement of safety codes and standards, and compliance of detailed industry safety guidelines.

Our risk control strategy has been implemented in many ways, including strengthening physical protection standards, enhancing emergency response abilities, constructing natural hazard early warning systems, and developing business continuity plan and crisis response exercise to achieve our continuous operation promise. The achievements of 2021 are as follows:

• Developed and completed compound disasters emergency response and business continuity exercise.

• Conducted a management team (MT) crisis and strategy workshop to lean from relevant experience.

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• Inherent safety design and rescue skill develop for emerging risk in UMC, including but not limit to: solar power generation system on the roof-top, lithium battery inside collaborative robot, and high fire load near tool buffer (NTB)…etc.

• Design-in the latest loss control guidelines in expansion projects.

• Maintain in house diesel oil inventory level to cope with the suddenly power disruption event.

• Fixed-term contract for private water source and water trucks to overcome water shortage risk in the drought season.

Furthermore, we have adopted the Triple Star Ranking System from AIG Insurance, a global leader in risk management and insurance, since 1999 to evaluate our risk management performance from third party’s point of view. All fabs have been ranked as top-class following AIG’s risk evaluation and risk improvement recommendations. We have also implemented proactive efforts in earthquake risk prevention. We believe our efforts contributed to our quick and exemplary recovery from three major earthquakes in Taiwan on September 21, 1999, March 4, 2010, and February 6, 2016, respectively. In order to reduce potential damages to our production facilities from earthquakes and similar incidents in the future, we continue to import the latest anti-seismic technologies, a seismic isolation platform for newly installed reticle stocker and furnace. Furthermore, we implemented an earthquake warning system in Tainan production base that will provide us with enhanced response time in the event of an earthquake.

Nowadays, extreme weather has become a risk to various business operations. In order to understand the potential impact to us, we implemented a flood risk simulation project in 2014. Since Hsinchu Science-Based Industrial Park is located in higher terrain; we believe there is no potential flood risk. However, for Fab12A in Tainan, we had conducted a physical improvement plan by installing floodgates in specific entrances to upgrade the protection level to a 500-year flood. Moreover, Taiwan suffered its worst drought in 56 years in 2021, as the Hsinchu and Tainan Science Park were up to 17% and 13%, respectively. In the face of climate change and a more severe water shortage conditions in the future, we have implemented actions based on different water restriction stages, including formulating various water-saving measures and production scheduling adjustments. We also continue to hire water trucks and increase the capacity of contracted private water sources as a contingency plan. In the future, various options such as the use of reclaimed water and recycled water will be continuously evaluated to reduce water risks.

In addition, we are fully aware of the impact presented by business interruption. We are also devoted in the pursuit of corporate resilience and continuity by committing non-interrupted services to satisfy our valued customers and important shareholders. In 2013, Fab 12A was the first foundry in the world to receive ISO 22301 Business Continuity Management certification. Following our certification roadmap, BCMs framework will continuously import to others production sites. It demonstrates our commitment to carry out disaster response abilities and ensure continuous production objective.

Insurance

We maintain industrial all risk insurance for our buildings, facilities, equipment and inventories as well as third-party properties. The insurance for fabs and their equipment covers losses from physical damage and business interruption up to their respective policy limits except for policy exclusions, including damages and interruptions caused by natural disasters such as earthquake or typhoons. In addition, we purchase directors and officers liability insurance for our board directors and executive officers, covering the liabilities incurred in relation to his/her/its operation of business and legally responsible for. We also maintain public liability insurance for losses to third parties arising from our business operations. We believe that our insurance arrangement is adequate to cover all major types of losses relevant to the semiconductor industry practice. However, significant damage to any of our production facilities, whether as a result of fire or other causes, could seriously harm our business and we may not be able to recover all of our losses through insurance policy coverage.

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C. Organizational Structure

The following list shows our corporate structure as of December 31, 2021:

Company	Jurisdiction of Incorporation	Percentage of Ownership as of December 31, 2021
UMC Group (USA)	U.S.A.		100.00	%
United Microelectronics (Europe) B.V.	The Netherlands		100.00	%
UMC Capital Corp.	Cayman Islands		100.00	%
TLC Capital Co., Ltd.	Taiwan, R.O.C.		100.00	%
Green Earth Limited	Samoa		100.00	%
Fortune Venture Capital Corp.	Taiwan, R.O.C.		100.00	%
UMC Investment (Samoa) Limited	Samoa		100.00	%
ECP Vita Pte. Ltd.	Singapore		100.00	%
Soaring Capital Corp.	Samoa		100.00	%
Unitruth Advisor (Shanghai) Co., Ltd.	China		100.00	%
Tera Energy Development Co., Ltd.	Taiwan, R.O.C.		100.00	%
United Microchip Corporation	Cayman Islands		100.00	%
Wavetek Microelectronics Corporation	Taiwan, R.O.C.		80.37	%
Everrich Energy Investment (HK) Limited	China		100.00	%
Everrich (Shandong) Energy Co., Ltd.	China		100.00	%
Wavetek Microelectronics Investment (Samoa) Limited	Samoa		80.37	%
Wavetek Microelectronics Corporation (USA)	U.S.A.		80.37	%
Best Elite International Limited	British Virgin Islands		100.00	%
Infoshine Technology Limited	British Virgin Islands		100.00	%
Oakwood Associates Limited	British Virgin Islands		100.00	%
Hejian Technology (Suzhou) Co., Ltd.	China		99.9985	%
UnitedDS Semiconductor (Shandong) Co., Ltd.	China		99.9985	%
United Semiconductor (Xiamen) Co., Ltd.	China		69.95	%
UMC Korea Co., Ltd.	Korea		100.00	%
Omni Global Limited	Samoa		100.00	%
United Microtechnology Corporation (California)	U.S.A.		100.00	%
Sino Paragon Limited	Samoa		100.00	%
United Semiconductor Japan Co., Ltd.	Japan		100.00	%

D. Property, Plants and Equipment

Please refer to “—B. Business Overview—Manufacturing Facilities” for a discussion of our property, plants and equipment.

ITEM 4A. UNRESOLVED STAFF COMMENTS

None

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ITEM 5 OPERATING AND FINANCIAL REVIEW AND PROSPECTS

Unless stated otherwise, the discussion and analysis of our financial condition and results of operations in this section apply to our financial information as prepared in accordance with IFRSs. You should read the following discussion of our financial condition and results of operations together with the consolidated financial statements and the notes to such statements included in this Annual Report. This discussion may contain forward-looking statements based upon current expectations that involve risks and uncertainties. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of various factors, including those set forth under “Item 3. Key Information—D. Risk Factors” or in other parts of this Annual Report on Form 20-F.

For the convenience of readers, NT dollar amounts used in this section for, and as of, the year ended December 31, 2021 have been converted into U.S. dollar amounts using US$1.00 = NT$27.74, the foreign currency exchange rate on December 30, 2021 as released by the Board of Governors of the Federal Reserve System. The U.S. dollar conversion appears in parentheses next to the relevant NT dollar amount.

Overview

We are one of the world’s leading independent semiconductor foundries, providing comprehensive wafer fabrication services and technologies to our customers based on their designs.

Cyclicality of the Semiconductor Industry

As the semiconductor industry is highly cyclical, revenues varied significantly over this period. Recently, the semiconductor industry has undergone a shift in demand in response to several prevalent trends, including the widespread implementation of 5G communications, proliferation of Internet of Things, advancement and adoption of electrical vehicles and EV related technologies, all of which caused an increase in unit shipment and silicon content that positively impacted our sales and revenue. In addition, the Covid-19 pandemic, which has accelerated the transformation of digital and electronic devices, also partially contributed to the global shortage of semiconductor manufacturing capacity. Given the significant increase of demands for semiconductor products, we recently experienced substantial growth of our business that contributed to higher utilization rate at our fabs. Our average capacity utilization rate was 88.7%, 96.9% and 104.4% for the years ended December 31, 2019, 2020 and 2021, respectively. We believe that our operating results in 2019, 2020 and 2021 continue to reflect the ongoing uncertainty in the global economy.

Pricing

We price our products on either a per die or a per wafer basis, taking into account a variety of factors, including the complexity of the technology, the prevailing market conditions, the order size, the cycle time, the strength and history of our relationship with the customer and our capacity utilization. Because semiconductor wafer prices tend to fluctuate frequently, we conduct a regular review our pricing on a quarterly basis. As a majority of our costs and expenses are fixed or semi-fixed in nature, fluctuations in our products’ average selling price historically have had a substantial impact on our margins and profitability. Our average selling price declined slightly by 0.5% from 2019 to 2020 and increased by 14.6% from 2020 to 2021, which reflects the optimization in overall product mix as well as the strong market demand primarily due to the recent trends in the semiconductor industry.

We believe that our current level of pricing is comparable to that of other leading foundries in each respective geometry. We believe that our ability to provide a wide range of advanced foundry services and process technologies as well as large manufacturing capacity will enable us to provide competitive pricing with other leading foundries at a comparable price level.

Capacity Utilization Rates

Our operating results are characterized by relatively high fixed costs. In 2019, 2020 and 2021, approximately 67.5%, 66.4% and 66.3%, respectively, of our manufacturing costs consisted of depreciation, a portion of indirect material costs, amortization of license fees and indirect labor costs.

If our utilization rates increase, our costs would be allocated over a larger number of units, which generally leads to lower unit costs. As a result, our capacity utilization rates can significantly affect our margins. Our utilization rates have varied from period to period to reflect our production capacity and market demand. Our average capacity utilization rate was 88.7%, 96.9% and 104.4% for the years ended December 31, 2019, 2020 and 2021, respectively. Utilization rates were primarily affected by global macroeconomic factors. Other factors affecting utilization rates are efficiency in production facilities, product flow management, the complexity and mix of the wafers produced, overall industry conditions, the level of customer orders, mechanical failure, disruption of operations due to expansion of operations, relocation of equipment or disruption of power supply, acquisition and disposition of foundry assets, and fire or natural disaster.

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Our production capacity is determined based on the capacity ratings of the equipment in the fab, provided by engineers, adjusted for, among other factors, actual output during uninterrupted trial runs, expected down time due to set up for production runs and maintenance, expected product mix and research and development. Because these factors include subjective elements, our measurement of capacity utilization rates may not be comparable to those of our competitors.

Change in Product Mix and Technology Migration

Because the price of wafers processed with different technologies varies significantly, the mix of wafers that we produce is among the primary factors that affect our revenues and profitability. The value of a wafer is determined principally by the complexity and performance of the processing technology used to produce the wafer, as well as by the yield and defect density. Production of devices with higher levels of functionality and performance, with better yields and lower defect density as well as with greater system-level integration requires better manufacturing expertise and generally commands higher wafer prices. The increase in price generally has more than offset associated increases in production cost once an appropriate economy of scale is reached.

Prices for wafers of a given level of technology generally decline over the processing technology life cycle. As a result, we have continuously been migrating to increasingly sophisticated technologies to maintain the same level of profitability. We introduced our 28-nanometer technology to customers in 2011 and commenced large-scale commercial production in 2014. The development of 22nm started in 2018 and entered into volume production in 2021. The logic and specialty process technology offerings from 22nm as well as 28nm specialty technologies satisfy new market demand as customers adopt UMC’s latest 12” process solutions. Our 28nm and below technologies contributed approximately 11.3%, 13.6% and 19.9% of our foundry revenue in 2019, 2020 and 2021 respectively.

The table below sets forth a breakdown of percentage of our wafer sales by process technologies in 2019, 2020 and 2021.

	Years Ended December 31,
Process Technologies	2019		2020		2021
	%		%		%
14 nanometers and under		0.0		0.0		0.1
28 nanometers		11.3		13.6		19.8
40 nanometers		23.1		23.3		18.8
65 nanometers		14.7		17.4		18.8
90 nanometers		13.6		11.5		8.2
0.11/0.13 micron		12.6		11.1		11.5
0.15/0.18 micron		13.1		12.8		12.5
0.25/0.35 micron		8.7		7.8		7.8
0.50 micron or higher		2.9		2.5		2.5
Total		100.0		100.0		100.0

Manufacturing Yields

Manufacturing yield per wafer is measured by the number of functional dice on that wafer over the maximum number of dice that can be produced on that wafer. A small portion of our products is priced on a per die basis, and our high manufacturing yields have allowed us to achieve higher margins. In addition, with respect to products that are priced on a per wafer basis, we believe that our ability to deliver high manufacturing yields generally has allowed us to either charge higher prices per wafer or attract higher order volumes, resulting in higher margins.

We continually upgrade our process technologies. At the beginning of each technological upgrade, the manufacturing yield utilizing the new technology is generally lower, sometimes substantially lower, than the yield under the current technology. The yield is generally improved through the expertise and cooperation of our research and development personnel and process engineers, as well as equipment and at times raw material suppliers. Our policy is to offer customers new process technologies as soon as the new technologies have passed our internal reliability tests.

Investments

Most of our investments were made to improve our market position and for strategy considerations, a significant portion of which are in foundry-related companies including fabless design customers, raw material suppliers and IP vendors.

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We have, from time to time, disposed of investments for financial, strategic or other purposes in recent years. See “Item 4. Information on the Company—B. Business Overview—Our Investments” for a description of our investments.

Treasury Share and Repurchase Programs

We have from time to time announced plans, none of which were binding on us, to repurchase up to a fixed amount of our common shares on the Taiwan Stock Exchange at the price range set forth in the plans. On November 5, 2018, our board of directors resolved to purchase up to 300 million common shares on the Taiwan Stock Exchange at a price between NT$7.55 and NT$20.80 per share during the period from November 6, 2018 to January 5, 2019 for cancellation. On April 24, 2019, our board of directors resolved to purchase up to 200 million common shares on the Taiwan Stock Exchange at a price between NT$8.40 and NT$18.10 per share during the period from April 25, 2019 to June 24, 2019 for cancellation. Our board of directors further resolved to repurchase up to 200 million common shares on the Taiwan Stock Exchange during a two-month period from June 8, 2020 to transfer to employees. We repurchased the total of 105 million common shares from June 8, 2020 through August 7, 2020 at a price between NT$11.55 and NT$23.25, with an average price of NT$15.98 per share. During 2021, we did not implement any plan to repurchase our common shares.

During 2019, 2020 and 2021, we purchased an aggregate of 220 million, 105 million and nil, common shares, respectively, and transferred nil million, 105 million and nil of such common shares that we repurchased under these plans to our employees as employee compensation in 2019, 2020 and 2021, respectively.

A. Operating Results

Operating Revenues

We generate our operating revenues primarily from the manufacture and sales of wafers that are fabricated at our foundries. We also derive a small portion of our operating revenues from wafer probe services that we perform internally as well as mask tooling services and assembly and test services that we subcontract to other companies.

Operating Costs

Our operating costs consist principally of:

• overhead, including depreciation and maintenance of production equipment, indirect labor costs, indirect material costs, supplies, utilities and royalties;

• wafer costs;

• direct labor costs; and

• service charges paid to subcontractors for mask tooling, assembly and test services.

Our total depreciation expenses were NT$47,173 million, NT$46,164 million and NT$44,180 million (US$1,593 million) in 2019, 2020 and 2021, respectively.

Operating Expenses

Our operating expenses consist of the following:

• Sales and marketing expenses, which consist primarily of intellectual property development expenses, salaries and related personnel expenses, wafer sample expenses and mask expenses. Wafer samples are actual silicon samples of our customers’ early design ideas made with our most advanced processes and provided to those customers;

• General and administrative expenses, which consist primarily of salaries for our administrative, finance and human resource personnel, fees for professional services, and cost of computer and communication systems to support our operations;

• Research and development expenses, which consist primarily of salaries and related personnel expenses, research testing related expenses and depreciation on the equipment used for our research and development; and

• Expected credit losses. For notes, accounts receivable and contract assets, we apply a simplified approach in calculating expected credit losses (ECLs) and recognize a loss allowance based on lifetime ECLs at each reporting date. ECLs are measured based on our historical credit loss experience and customers’ current financial condition, adjusted for forward-looking factors, such as customers’ economic environment.

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Net Other Operating Income and Expenses

Net other operating income and expenses consist primarily of:

• amortization of deferred government grants related to machinery and equipment;

• gains or losses arising from disposal of property, plant and equipment; and

• net rental income or loss from property.

Non-operating Income and Expenses

Our non-operating income and expenses primarily consist of the following:

1. Other income, which consists of:

• interest income, which is primarily derived from time deposits; and

• dividend income, which is primarily derived from financial assets at fair value through profit or loss and financial assets at fair value through other comprehensive income.

2. Other gains and losses, which principally consist of:

• gains or losses on valuation of financial assets and liabilities, which are primarily derived from disposal of and changes in the values of financial assets and liabilities classified as fair value through profit or loss;

• impairment loss, which is primarily derived from the loss recognized in investments accounted for under the equity method; and

• gains or losses on disposal of investments, which are primarily derived from our disposal of investments accounted for under the equity method.

3. Finance costs, which principally consist of:

• interest expenses, which are primarily derived from bonds payable and bank loans; and

• financial expenses, which are primarily derived from shareholder services proxy fee.

4. Share of profit or loss of associates and joint ventures, which is primarily derived from the recognition of investee companies’ net profit based on the ownership percentage we hold.

5. Bargain purchase gain, which is derived from the acquisition of United Semiconductor Japan Co., Ltd. (USJC). The fair value of the net identifiable assets acquired and liabilities assumed was in excess of the aggregate consideration transferred and the previously held ownership interest of 15.9% in USJC at the acquisition date, and the difference was recognized as bargain purchase gain.

The previously held ownership interest of 15.9% in USJC was previously accounted for as financial assets at fair value through other comprehensive income, non-current. It was subsequently remeasured at fair value with the consideration for a minority interest discount on the acquisition date resulting in the bargain purchase gain.

Taxation

In R.O.C., the corporate income tax rate and unappropriated earnings tax rate are 20% and 5%, respectively. Based on our status as a company engaged in the semiconductor business in Taiwan, we have been granted exemptions from income taxes in Taiwan with respect to income attributable to capital increases for the purpose of purchasing equipment related to the semiconductor business for a period of five years following each such capital increase. In addition, our branch in Singapore enjoys tax exemption for income derived from tax-exempted activities under Singapore’s Income Tax Act and Economic Expansion Incentive (Relief from Income Tax) Act. These tax exemptions resulted in tax savings of approximately NT$1,716 million, NT$2,383 million and NT$2,995 million (US$108 million) in 2019, 2020 and 2021, respectively. Under the amendment to the R.O.C. Statute of Industrial Innovation in 2019, the amounts of unappropriated earnings from 2018 and thereafter used for constructing or purchasing buildings, qualified equipment and technology can qualify for deduction when computing the income tax on unappropriated earnings. We also benefit from other tax incentives generally available to technology companies in Taiwan, such as tax credits applicable against corporate income tax that range from 10% to 15% of qualified research and development expenditures and 3% to 5% of the amount of investment in certain qualified equipment and technology. These tax incentives resulted in tax savings of approximately NT$448 million, NT$692 million and NT$958 million (US$35 million) in 2019, 2020 and 2021, respectively.

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The R.O.C. government enacted the R.O.C. Income Basic Tax Act, also known as the “Alternative Minimum Tax Act”, or the AMT Act, to impose an alternative minimum tax. AMT is a supplemental tax which is payable if the income tax payable pursuant to the R.O.C. Income Tax Act is below the minimum amount prescribed under the AMT Act. Most tax-exempt income under the R.O.C. Income Tax Act is considered to be taxable under the AMT Act, such as eligible income generated during tax holidays and capital gain from selling domestic securities, and tax credits are not allowed to deduct AMT. The tax rate for business entities is 12%.

After taking into account the tax exemptions and tax incentives discussed above, we recorded NT$230 million, NT$1,691 million and NT$7,918 million (US$285 million) of income tax expenses in 2019, 2020 and 2021, respectively. Our effective income tax rate in 2021 was 13.54%.

Comparisons of Results of Operations

The following table sets forth some of our results of operations data as a percentage of our operating revenues for the periods indicated.

	Years Ended December 31,
	2019			2020			2021
	%			%			%
Operating revenues		100.0			100.0			100.0
Operating costs		(85.6	)		(77.9	)		(66.2	)
Gross profit		14.4			22.1			33.8
Operating expenses
Sales and marketing		(2.6	)		(2.3	)		(2.2	)
General and administrative		(3.6	)		(3.8	)		(3.7	)
Research and development		(8.0	)		(7.3	)		(6.1	)
Expected credit impairment gains (losses)		(0.4	)		0.2			0.0
Subtotal		(14.6	)		(13.2	)		(12.0	)
Net other operating income and expenses		3.5			3.5			2.5
Operating income		3.3			12.4			24.3
Non-operating income and expenses		(0.1	)		0.3			3.2
Income from continuing operations before income tax		3.2			12.7			27.5
Income tax expense		(0.1	)		(0.9	)		(3.8	)
Net income		3.1			11.8			23.7
Total other comprehensive income, net of tax		1.9			1.4			1.7
Total comprehensive income		5.0			13.2			25.4
Net income attributable to:
Shareholders of the parent		5.5			12.9			24.0
Non-controlling interests		(2.4	)		(1.1	)		(0.3	)
Total comprehensive income attributable to:
Shareholders of the parent		7.4			14.3			25.7
Non-controlling interests		(2.4	)		(1.1	)		(0.3	)

Year Ended December 31, 2021 Compared to Year Ended December 31, 2020

Operating revenues. Operating revenues increased by 20.5% from NT$176,821 million in 2020 to NT$213,011 million (US$7,679 million) in 2021, primarily due to a 10.6% increase in foundry wafer shipment due to increased customer demand from 8,913 thousand 8-inch equivalent wafers in 2020 to 9,862 thousand 8-inch equivalent wafers in 2021, while partially offset by a 5.3% appreciation of the NTD against the USD in 2021.

Operating costs. Operating costs increased by 2.3% from NT$137,824 million in 2020 to NT$140,961 million (US$5,082 million) in 2021, primarily due to an increase in shipments in response to customer demand.

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Gross profit and gross margin. Gross profit increased from NT$38,997 million in 2020 to NT$72,050 million (US$2,597 million) in 2021. Our gross margin increased from 22.1% in 2020 to 33.8% in 2021, primarily due to the increase in capacity utilization resulting from the strong market demand.

Operating income and operating margin. Operating income increased from NT$21,931 million in 2020 to NT$51,686 million (US$1,863 million) in 2021. Our operating margin increased from 12.4% in 2020 to 24.3% in 2021. The increase in operating margin was largely due to the increase in gross profit as described above. Operating expenses increased by 9.7% from NT$23,320 million in 2020 to NT$25,590 million (US$923 million) in 2021.

Sales and marketing expenses. Our sales and marketing expenses increased by 12.5% from NT$4,152 million in 2020 to NT$4,671 million (US$168 million) in 2021, mainly due to increase of NT$517 million (US$19 million) in IP and IP royalty expenses. Our sales and marketing expenses as a percentage of our operating revenues decreased from 2.3% in 2020 to 2.2% in 2021.

General and administrative expenses. Our general and administrative expenses increased by 19.9% from NT$6,664 million in 2020 to NT$7,990 million (US$288 million) in 2021, mainly due to an increase of NT$1,557 million (US$56 million) in personnel expenses. Our general and administrative expenses as a percentage of our operating revenues decreased from 3.8% in 2020 to 3.7% in 2021.

Research and development expenses. Our research and development expenses increased by 0.3% from NT$12,896 million in 2020 to NT$12,935 million (US$466 million) in 2021. The increase in research and development expenses was mainly due to increase of NT$664 million (US$24 million) in personnel expenses, which was partially offset by the decrease of NT$434 million (US$16 million) in research and development expenses of wafers, NT$83 million (US$3 million) in other research expenses and NT$74 million (US$3 million) in mask expenses. Our research and development expenses as a percentage of our operating revenues decreased from 7.3% in 2020 to 6.1% in 2021.

Expected credit impairment gains. Our expected credit impairment gains decreased from NT$392 million in 2020 to NT$6 million (US$0 million) in 2021. The decrease in expected credit impairment gains was mainly due to the loss allowance on accounts receivable assessed by us primarily at an amount equal to the assets’ lifetime expected credit losses. Our expected credit impairment gains as a percentage of our operating revenues decreased from 0.2% in 2020 to 0.0% in 2021.

Net other operating income and expenses. Net other operating income decreased by 16.4% from NT$6,254 million in 2020 to NT$5,227 million (US$188 million) in 2021, mainly due to a disposal gain on buildings of NT$1,081 million from new business segment in 2020. Net other operating income and expenses as a percentage of our operating revenues decreased from 3.5% in 2020 to 2.5% in 2021.

Non-operating income and expenses. Non-operating income and expenses increase by 1,012.7% from a gain of NT$612 million in 2020 to a gain of NT$6,810 million (US$245 million) in 2021, mainly due to the increase in share of profit or loss of associates and joint ventures from a gain of NT$1,300 million in 2020 to a gain of NT$5,193 million (US$187 million) in 2021, an increase in other income from NT$698 million in 2020 to NT$1,653 million (US$60 million) in 2021, and an increase in other gains and losses from NT$49 million in 2020 to NT$866 million (US$31 million) in 2021.

Other comprehensive income (loss), net of tax. Our other comprehensive income, net of tax, increased from an income of NT$2,480 million in 2020 to an income of NT$3,420 million (US$123 million) in 2021. We attributed this change primarily to an increase in share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss from a gain of NT$768 million in 2020 to a gain of NT$2,863 million (US$103 million) in 2021, the increase in unrealized gain (loss) from equity instruments investments measured at fair value through other comprehensive income from a gain of NT$4,680 million in 2020 to a gain of NT$5,451 million (US$197 million) in 2021, partially offset by the increase in the loss of exchange differences on translation of foreign operations from a loss of NT$2,882 million in 2020 to a loss of NT$4,718 million (US$170 million) in 2021.

Net income attributable to the shareholders of the parent. Due to the factors described above, our net income increased by 124.2% from NT$22,861 million in 2020 to NT$51,246 million (US$1,847 million) in 2021.

Total comprehensive income attributable to the shareholders of the parent. Due to the factors described above, our comprehensive income increased by 116.8% from NT$25,215 million in 2020 to NT$54,667 million (US$1,971 million) in 2021.

Year Ended December 31, 2020 Compared to Year Ended December 31, 2019

For the comparison of our operating results for the year ended December 31, 2020 to the year ended December 31, 2019, please refer to “Item 5. Operating and Financial Review and Prospects—Operating Results—Comparisons of Results of Operations—Year Ended December 31, 2020 Compared to Year Ended December 31, 2019” of our annual report on Form 20-F filed with the Securities and Exchange Commission on April 29, 2021.

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B. Liquidity and Capital Resources

The foundry business is highly capital intensive. Our development over the past three years has required significant investments. Additional expansion for the future generally will continue to require significant cash for acquisition of plant and equipment to support increased capacities, particularly for the production of 12-inch wafers, although our expansion program will be adjusted from time to time in response to market conditions and customer demand. In addition, the semiconductor industry has historically experienced rapid changes in technology. To maintain competitiveness at the same capacity, we are required to make adequate investments in plant and equipment. In addition to our need for liquidity to support the substantial fixed costs of capacity expansion and the upgrading of our existing plants and equipment for new technologies, as we ramp up production of new plant capacity, we require significant working capital to support purchases of raw materials for our production and to cover variable operating costs such as labor costs until production yields provide sufficiently positive margins for a fabrication facility to produce operating cash flows.

Resource for Liquidity

We have financed our capital expenditure requirements in recent years from operating cash inflows, bank borrowings, as well as the issuance of corporate bonds and equity-linked securities denominated in NT dollars and U.S. dollars. Operating cash inflows significantly exceed operating income, reflecting the significant non-cash depreciation expense.

As of December 31, 2021, we had NT$132,622 million (US$4,781 million) of cash and cash equivalents and NT$945 million (US$34 million) of financial assets at fair value through profit or loss. Cash equivalents included time deposits with original maturities of three months or less and repurchase agreements collateralized by government bonds and corporate notes. These agreements bore interest rates ranging from 0.26% to 0.46%, 0.16% to 0.24% and 0.14% to 0.21%, in 2019, 2020 and 2021, respectively. The terms of these agreements were typically less than one month. As of December 31, 2019, 2020 and 2021, we held repurchase agreements in the amount of NT$9,135 million, NT$6,940 million and NT$10,001 million (US$361 million), respectively.

In early June 2012, we issued five-year and seven-year domestic unsecured corporate bonds totaling NT$10,000 million, with a face value of NT$1 million per unit. The five-year domestic unsecured corporate bond was issued in the amount of NT$7,500 million. Interest will be paid annually at 1.43%. The seven-year domestic unsecured corporate bond was issued in the amount of NT$2,500 million. Interest will be paid annually at 1.63%. All the principal has been fully repaid. The proceeds of this offering were used for purchasing machinery and equipment.

In mid-March 2013, we issued another five-year and seven-year domestic unsecured corporate bonds totaling NT$10,000 million, with a face value of NT$1 million per unit. The five-year domestic unsecured corporate bond was issued in the amount of NT$7,500 million. Interest will be paid annually at 1.35%. The seven-year domestic unsecured corporate bond was issued in the amount of NT$2,500 million. Interest will be paid annually at 1.50%. All the principal has been fully repaid. The proceeds of this offering were used for purchasing machinery and equipment.

In mid-June 2014, we issued an aggregate principal amount of NT$5,000 million of seven-year and ten-year domestic unsecured corporate bonds, with a denomination of NT$1 million per bond. The seven-year domestic unsecured corporate bond was issued with an aggregate principal amount of NT$2,000 million with an annual coupon bearing an interest rate of 1.7%. The ten-year domestic unsecured corporate bond was issued with an aggregate principal amount of NT$3,000 million with an annual coupon bearing an interest rate of 1.95%. The proceeds of this offering were used for repay debts. As of December 31, 2021, NT$3,000 million aggregate principal amount of these bonds were outstanding.

In mid-May 2015, we issued five-year US$600 million aggregate principal amount of currency linked zero coupon convertible bonds due 2020. The proceeds of this offering were used for purchasing machinery and equipment. In 2019 and 2020, certain bondholders had converted the outstanding principal amount of the convertible bonds totaling US$231 million into 498 million common shares. Upon the maturity date on May 18, 2020, we fully redeemed the remaining unconverted bonds at 98.76% of the principal amount totaling US$369 million.

In late March 2017, we issued another five-year and seven-year domestic unsecured corporate bonds totaling NT$8,300 million, with a face value of NT$1 million per unit. The five-year domestic unsecured corporate bond was issued in the amount of NT$6,200 million. Interest is due and payable annually at 1.15%, and the principal was repaid in March 2022. The seven-year domestic unsecured corporate bond was issued in the amount of NT$2,100 million. Interest will be paid annually at 1.43%, and the principal will be repayable in March 2024 upon maturity. The proceeds of this offering were used for repay debts. As of December 31, 2021, NT$8,300 million aggregate principal amount of these bonds were outstanding.

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In early October 2017, we issued another five-year and seven-year domestic unsecured corporate bonds totaling NT$5,400 million, with a face value of NT$1 million per unit. The five-year domestic unsecured corporate bond was issued in the amount of NT$2,000 million. Interest will be paid annually at 0.94%, and the principal will be repayable in October 2022 upon maturity. The seven-year domestic unsecured corporate bond was issued in the amount of NT$3,400 million. Interest will be paid annually at 1.13%, and the principal will be repayable in October 2024 upon maturity. The proceeds of this offering were used for repay debts. As of December 31, 2021, NT$5,400 million aggregate principal amount of these bonds were outstanding.

In late April 2021, we issued another five-year, seven-year and ten-year domestic unsecured corporate bonds totaling NT$9,600 million, with a face value of NT$1 million per unit. The five-year domestic unsecured corporate bond was issued in the amount of NT$5,500 million. Interest will be paid annually at 0.57%, and the principal will be repayable in April 2026 upon maturity. The seven-year domestic unsecured corporate bond was issued in the amount of NT$2,000 million. Interest will be paid annually at 0.63%, and the principal will be repayable in April 2028 upon maturity. The ten-year domestic unsecured corporate bond was issued in the amount of NT$2,100 million. Interest will be paid annually at 0.68%, and the principal will be repayable in April 2031 upon maturity. The proceeds of this offering were used for purchasing machinery and equipment and environmental protection related expenditures. As of December 31, 2021, NT$9,600 million aggregate principal amount of these bonds were outstanding.

In early July 2021, we issued zero coupon exchangeable bonds due 2026. The exchangeable bond offerings consist of US$400 million bonds exchangeable into common shares of Novatek Microelectronics Corp., Ltd., or Novatek. As of December 31, 2021, no bonds had been exchanged into common shares of Novatek.

In mid-December 2021, we issued another five-year domestic unsecured corporate bonds totaling NT$5,000 million, with a face value of NT$1 million per unit. Interest will be paid annually at 0.63%, and the principal will be repayable in December 2026 upon maturity. The proceeds of this offering were used for purchasing machinery and equipment. As of December 31, 2021, NT$5,000 million aggregate principal amount of these bonds were outstanding.

Operating Activities

In 2021, net cash provided by operating activities was NT$90,352 million (US$3,257 million), primarily due to net income before income tax of NT$58,496 million (US$2,109 million) and the add-back of non-cash items, such as depreciation and amortization in the amount of NT$47,075 million (US$1,697 million).

In 2020, net cash provided by operating activities was NT$65,745 million, primarily due to net income before income tax of NT$22,543 million and the add-back of non-cash items, such as depreciation and amortization in the amount of NT$48,908 million.

In 2019, net cash provided by operating activities was NT$54,904 million, primarily due to net income before income tax of NT$4,806 million and the add-back of non-cash items, such as depreciation and amortization in the amount of NT$49,390 million.

Investing Activities

In 2021, net cash used in investing activities was NT$62,163 million (US$2,241 million), primarily due to cash used to purchase equipment at our fabs amounting to NT$48,035 million (US$1,732 million) and net increase in other financial assets amounting to NT$14,989 million (US$540 million).

In 2020, net cash used in investing activities was NT$40,112 million, primarily due to cash used to purchase equipment at our fabs amounting to NT$26,345 million and net increase in other financial assets amounting to NT$12,438 million.

In 2019, net cash used in investing activities was NT$31,682 million, primarily due to cash used to purchase equipment at our fabs amounting to NT$16,518 million and acquisition of subsidiary (net of cash acquired) amounting to NT$12,801 million.

Financing Activities

In 2021, net cash provided in financing activities was NT$12,490 million (US$450 million), primarily due to bonds issued of NT$25,704 million (US$927 million) and net increase in guarantee deposits NT$14,219 million (US$513 million), partially offset by NT$19,871 million (US$716 million) for cash dividend payment.

In 2020, net cash used in financing activities was NT$25,601 million, primarily due to bonds redemption of NT$13,703 million and NT$9,766 million for cash dividend payment.

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In 2019, net cash used in financing activities was NT$9,867 million, primarily due to bonds redemption of NT$2,500 million, NT$6,911 million for cash dividend payment, and treasury stock acquired of NT$2,972 million, partially offset by NT$2,883 million due to the increase in bank loans.

We had bonds payable of NT$40,537 million (US$1,461 million) in the aggregate as of December 31, 2021.

We had NT$1,924 million (US$69 million) in outstanding short-term loans as of December 31, 2021. We had total availability under existing short-term lines of credit of NT$72,743 million (US$2,622 million) as of December 31, 2021. The following table sets forth our outstanding long-term bank loans as of December 31, 2021:

	Unsecured long-term bank loans				Secured long-term bank loans
	(in NT$ millions)		(in US$ millions)		(in NT$ millions)		(in US$ millions)
Due in 2022		1,653		60		18,220		657
Due in 2023		615		22		172		6
Due in 2024		513		19		233		8
Due in 2025		592		21		3,790		137
Due in 2026		2,546		92		3,129		113
Due in 2027 & thereafter		—		—		5,162		186

The interest rates of our long-term bank loans range from 0.85% to 4.66%. As of December 31, 2021, we were in full compliance with our loan covenants, except that USCXM, a subsidiary of UMC, failed to comply with the loan covenant to maintain its financial ratio at certain level and therefore the loan was reclassified to current liabilities. USCXM has notified the bank and commenced the process to apply for a waiver. The waiver has been obtained as of February 7, 2022. For more information, please refer to Note 6(14) to our audited consolidated financial statements included elsewhere in this Annual Report.

As of December 31, 2021, the current or exchangeable portion of bonds due within one year was NT$17,459 million (US$629 million), and the current portion of long-term bank loans due within one year was NT$19,873 million (US$717 million).

Capital Expenditures

We will continue to employ a ROI-driven approach in our capital expenditure planning as our expansion projects will be supported by customers who have signed multi-year supply agreements with us. As of December 31, 2021, our construction contracts amounted to NT$19,613 million (US$707 million) and the portion of the contracts not yet recognized was approximately NT$14,394 million (US$519 million). In 2019, 2020 and 2021, we incurred capital expenditures of approximately NT$17,760 million, NT$28,104 million and NT$50,120 million (US$1,807 million), respectively, primarily to purchase equipment for research and development and production at our fabs.

Wafer demand outlook continues to significantly outpace supply, driven by several prevalent industry trends, including widespread implementation of 5G communications, advancement and adoption in electrical vehicles and other EV related technologies, proliferation of IoT, all of which contributed to our rising customer demand and increase in silicon content in electronic products. Accordingly, we will continue to pursue expansion projects under our customers’ multi-year supply agreements, which enable us to mitigate the uncertainties and risks in the markets. During April 2021, we announced an expansion of 300mm Fab 12A Phase 6 (P6) in Taiwan’s Tainan Science Park through a collaboration model where the program is supported by customers’ multi-year product alignment. As part of the agreement, these customers will provide us with a loading protection mechanism to ensure that P6 fab utilization rates will be maintained at healthy levels. In addition, on February 24, 2022 the company’s board of directors has approved a plan to build a new advanced manufacturing facility next to its existing 300mm fab (Fab12i) in Singapore. The first phase of this greenfield fab will have a monthly capacity of 30,000 wafers with production expected to commence in late 2024. The new fab (Fab12i P3) will provide 28nm and 22nm process technologies.

Contractual Obligations

Our material cash requirement for known contractual obligation came from bonds, loans, lease obligation, commitment for purchase obligations, the guarantee deposits and financial liability for the repurchase of other investors’ investment. As of December 31, 2021, the total contractual cash obligations, including the amounts which has yet been recorded on our balance sheet as of December 31, 2021, are NT$178,927 million, among which NT$94,763 million will be due within 1 year and NT$ 84,164 million will be due after 1 year.

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Transactions with Related Parties

See “Item 7. Major Shareholders and Related Party Transactions—B. Related Party Transactions” and Note 7 to our audited consolidated financial statements included in this Annual Report.

C. Research, Development, Patents and Licenses, Etc.

The semiconductor industry is characterized by rapid changes in technology, frequently resulting in obsolescence of process technologies and products. As a result, effective research and development is essential to our success. We invested approximately NT$11,860 million, NT$12,896 million and NT$12,935 million (US$466 million) in 2019, 2020 and 2021, respectively, in research and development, which represented 8.0%, 7.3% and 6.1%, respectively, of operating revenues for such years. We believe that our continuous spending on research and development will help us achieve positive results in the development of advanced and specialty technologies.

Our current research and development activities seek to optimize the use of available capacity by developing new process platforms into existing technology nodes. Although we emphasize firm-wide participation in the research and development process, we maintain central research and development teams primarily responsible for developing cost-effective technologies that can serve the manufacturing needs of our customers. Monetary incentives are provided to our employees if projects result in successful patents. We believe we have a strong foundation in research and development and intend to continue our efforts on technology developments. Our management believes in the value of continued support of research and development efforts and intends to continue our foundry position by providing customers with comprehensive technology and SoC solutions in the industry.

D. Trend Information

Please refer to “Item 5. Operating and Financial Review and Prospects—Overview” for a discussion of the most significant recent trends in our production, sales, costs and selling prices. In addition, please refer to discussions included in this Item for a discussion of known trends, uncertainties, demands, commitments and events that we believe are reasonably likely to have a material effect on our operating revenues, income from continuing operations, profitability, liquidity or capital resources, or that would cause reported financial information not necessarily to be indicative of future operating results or financial condition.

E. Critical Accounting Estimates

Please refer to Note 5 to our audited consolidated financial statements included elsewhere in this Annual Report.

ITEM 6 DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES

A. Directors and Senior Management

The following table sets forth the name, age, position, tenure and biography of each of our directors and executive officers as of March 31, 2022. There is no family relationship among any of these persons.

The business address of our directors and executive officers is the same as our registered address.

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Name	Age		Position	Year(s) with Us
Stan Hung		61	Chairman, Director and Chief Strategic Officer		30
SC Chien		64	Co-president and Director (Representative of Hsun Chieh Investment Co., Ltd.)		33
Jason Wang		59	Co-president and Director (Representative of Silicon Integrated Systems Corp.)		14
Lih J. Chen (1)		75	Independent Director		4
Jyuo-Min Shyu (1)		68	Independent Director		4
Wenyi Chu (1)		55	Independent Director		7
Kuang-Si Shiu (1)		70	Independent Director		1
Wen-Shin Hsu (1)		45	Independent Director		1
Ting-Yu Lin		60	Director		16
Chitung Liu		56	Chief Financial Officer, Senior Vice President and Head of Corporate Governance		21

(1) Member of the Audit Committee and Remuneration Committee.

Stan Hung is a director, Chief Strategic Officer and the Chairman of our company. Mr. Hung was our chief financial officer and senior vice president from 2000 to 2007. He was also the Chairman of ITE TECH. INC. from 2007 to 2008 and a director of EPISTAR Corporation from 2007 to 2016. Prior to re-joining United Microelectronics Corporation in 1991, Mr. Hung was a financial manager at Optoelectronics Corporation. He is also the chairman of Fortune Venture Capital Corp., TLC Capital Co. Ltd., Faraday Technology Corporation, UMC Capital Corp., a director of Triknight Capital Corporation, United Microelectronics (Europe) B.V. and an executive director of UnitedDS Semiconductor (Shandong) Co., Ltd. Mr. Hung received a bachelor’s degree in accounting from Tam Kang University in 1982.

SC Chien is a director and the President of our company. Mr. Chien joined UMC in 1989 and has been responsible for overseeing departments involved in advanced technology development, specialty technology development and customer engineering. Mr. Chien is a representative of institutional director, Hsun Chieh Investment Co., Ltd. and he is also a director of Fortune Venture Capital Corp., TLC Capital Co., Ltd., Unimicron Technology Corp. and UMC Capital Corp. Mr. Chien received a bachelor’s degree in chemical engineering from National Taiwan University.

Jason Wang is a director and the President of our company. Mr. Wang is a representative of institutional director, Silicon Integrated Systems Corp. and also serves on the board of directors of UMC GROUP (USA) since 2004. Mr. Wang joined UMC as Vice President of Corporate Marketing in 2008, and from 2009 to 2014, served as President of UMC GROUP (USA) responsible for business operation efficiency enhancement and UMC North America strategic business development. Mr. Wang is also a director of Fortune Venture Capital Corp., TLC Capital Co., Ltd., United Microelectronics (Europe) B.V., UMC Capital Corp.and United Microtechnology Corporation (California). Mr. Wang did his undergraduate study in Business Administration at San Jose State University.

Lih J. Chen is an independent director of our company. Professor Chen is the Distinguished Chair Professor of National Tsing Hua University and an Academician at Academia Sinica. He was also the President of National Tsing Hua University and the Deputy Ministers of National Science Council. Professor Chen received a Ph.D. degree in physics from University of California, Berkeley in 1974.

Jyuo-Min Shyu is an independent director of our company. Dr. Shyu is an Emeritus Professor at National Tsing Hua University. He was also the Minister of Ministry of Science and Technology and the President of Industrial Technology Research Institute. Dr.Shyu is also an independent director of Qisda Corporation and Far EasTone Telecommunications Co., Ltd., as well as a director of Iridium Medical Technology Co., Ltd, GeoThings, Inc. and Alpha Ring Asia Inc. Professor Shyu received a Ph.D. degree in Electrical Engineering and Computer Science from University of California, Berkeley in 1988.

Wenyi Chu is an independent director of our company. Professor Chu is a professor at the Department of Business Administration at National Taiwan University. Professor Chu was the chairwoman of Graduate Institute of Business Administration and the Dean of Department of Business Administration in National Taiwan University from 2012 to 2014. Professor Chu received a Ph.D. degree in Strategy and International Management from London Business School, United Kingdom in 1997.

Kuang-Si Shiu is an independent director of our company. Mr. Shiu is also an independent director of Yuanta Financial Holdings Co., Ltd. and Yuanta Commercial Bank Co., Ltd. Mr. Shiu served in financial institutions for over 30 years, he was also formerly chairman & president of Mega Financial Holding Co., Ltd. and Mega International Commercial Bank Co., Ltd., chairman of Hua Nan Financial Holdings Co., Ltd., Hua Nan Commercial Bank Ltd. and Land Bank of Taiwan Co., Ltd. Mr. Shiu received a MBA degree in Indiana University in 1978.

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Wen-Shin Hsu is an independent director of our company. Professor Hsu is a professor at the Department of Accounting at National Taiwan University. Professor Hsu is the Director of Global MBA in National Taiwan University from 2019, Associate Dean of International affairs of College of Management School in National Taiwan University from 2020. Professor Hsu is also an independent director of Unitech Printed Circuit Board Corp., and ANT Precision Industry Co., Ltd., director of Universal Venture Capital Investment Corporation and Taiwan Insurance Guaranty Fund. Professor Hsu received a Ph.D. degree in Accounting &Finance from Lancaster University in 2006.

Ting-Yu Lin is a director of our company. Mr. Lin is also the chairperson of Sunrox International Inc. and the director of Unimicron Technology Corp. Mr. Lin received a master’s degree in international finance from Meiji University in 1993.

Chitung Liu is the Chief Financial Officer and the Senior Vice President of our company. On March 6, 2019, Mr. Chitung Liu was appointed as our Head of Corporate Governance. Prior to joining our company in 2001, Mr. Liu was a managing director of UBS. Mr. Liu is a director of Fortune Venture Capital Corp., TLC Capital Co., Ltd., Unimicron Technology Corp., Novatek Microelectronic Corp., Hejian Technology (Suzhou) Co., Ltd., UMC Group (USA), Green Earth Limited, ECP Vita Pte. Ltd., UMC Capital Corp., United Microchip Corporation, Sino Paragon Limited and United Semiconductor Japan Co., Ltd. Mr. Liu received an executive MBA degree from National Taiwan University in 2009.

B. Compensation

The aggregate compensation paid and benefits in kind granted to our directors in 2021 were approximately NT$31.3 million (US$1.1 million). The remuneration was out of our 2021 earnings distribution plan, and the distribution percentage for directors is 0.06%. See “Item 10. Additional Information—B. Memorandum and Articles of Association—Dividends and Distributions”. Some of the remuneration was paid to the legal entities that certain directors represent. The aggregate compensation paid and benefits in kind granted to our executive officers in 2021 were approximately NT$1,366.6 million (US$49.26 million), which include NT$197.1 million (US$7.1 million) as bonus. The aggregate compensation paid and benefits in kind granted to our directors and senior management in 2021 were approximately NT$473 million (US$17.05 million), which include NT$46.1 million (US$1.66 million) as bonus.

C. Board Practices

All of our directors were elected in June 2021 for a term of three years at our annual general meeting of shareholders. Neither we nor any of our subsidiaries has entered into a contract with any of our directors by which our directors are expected to receive benefits upon termination of their services.

Audit Committee

Our board of directors established an audit committee in March 2005. In the annual general meeting held on June 13, 2008, we amended our articles of incorporation to introduce the mechanism of an Audit Committee. See “Item 10. Additional Information—B. Memorandum and Articles of Association—Directors”. After the re-election of directors in the annual general meeting on July 7, 2021, our board of directors appointed Lih J. Chen, Jyuo-Min Shyu, Wenyi Chu, Kuang-Si Shiu and Wen-Shin Hsu to be members of the audit committee. Each audit committee member is an independent director who is financially literate with accounting or related financial management expertise. The audit committee meets as often as it deems necessary to carry out its responsibilities. Pursuant to an audit committee charter, the audit committee has responsibility for, among other things, overseeing the qualifications, independence and performance of our internal audit function and independent auditors, and overseeing the accounting policies and financial reporting and disclosure practices of our company. The audit committee also has the authority to engage special legal, accounting or other consultants it deems necessary in the performance of its duties.

Remuneration Committee

The R.O.C. Securities and Exchange Act, as amended on November 24, 2010, further introduced the mechanism of a “Remuneration Committee”, which requires publicly listed companies in the R.O.C., including our company, to adopt a remuneration committee. Pursuant to the Regulations Governing the Establishment and Exercise of Powers by Compensation Committees of Public Companies, the remuneration committee shall be composed of no less than three members commissioned by the board of directors. In addition, for a company with independent directors, such as us, at least one of the remuneration committee members shall be an independent director. We established a remuneration committee in accordance with Article 14-6 of the R.O.C. Securities and Exchange Act on April 27, 2011. We amended our articles of incorporation to implement the mechanism of our remuneration committee during the annual general meeting held on June 15, 2011. After the re-election of directors in the annual general meeting on July 7, 2021, our board of directors appointed Lih J. Chen, Jyuo-Min Shyu, Wenyi Chu, Kuang-Si Shiu and Wen-Shin Hsu to serve as members of the remuneration committee.

Pursuant to applicable SEC rules and NYSE listing standards, we as a foreign private issuer are required to disclose any significant ways in which our corporate governance practices differ from those followed by NYSE-listed U.S. domestic companies under the NYSE’s listing standards. A copy of the significant differences between our corporate governance practices and NYSE corporate governance rules applicable to U.S. companies is available on our website https://www.umc.com/upload/media/08_Investors/Corporate_Governance/Corporate_Governance/The_differences_between_the_UMCs_corporate_

governance_practices_and_those_required_of_domestic_companies_under_NYSE_listing_standards_20190306.pdf.

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Nominating Committee

Our board of directors established a nominating committee in December 2017. Our nominating committee initially consists of Lih J. Chen, Jyuo-Min Shyu, Wenyi Chu, Kuang-Si Shiu and Wen-Shin Hsu each of whom is an independent director. The nominating committee is to assist the board to enhance the management mechanism and improve corporate governance for our sustainable development. The objectives of our nominating committee include: (i) to constitute the nomination policy and succession plans of the directors and the executives, and to review and propose the candidate list of the directors and the executives accordingly; (ii) to construct and to develop the operation of our board and the board committees, as well as to plan and assess the performance of the board, the board committees and the executives, and (iii) to enhance the corporate governance system and practices in order to protect the interests of our shareholders.

D. Employees

As of December 31, 2021, we had 19,741 employees, which included 11,606 engineers, 7,318 technicians and 817 administrative staff performing administrative functions on a consolidated basis, where a majority of the employees work from our Taiwan R.O.C. offices and facilities. We have in the past implemented, and may in the future evaluate the need to implement, labor redundancy plans based on the work performance of our employees.

	As of December 31,
	2019		2020		2021
Employees
Engineers		11,328		11,377		11,606
Technicians		7,416		7,211		7,318
Administrative Staff		833		798		817
Total		19,577		19,386		19,741

Employee salaries are reviewed annually. Salaries are adjusted based on industry standards, inflation and individual performance. As an incentive, additional bonuses in cash may be paid at the discretion of management based on the performance of individuals. In addition, except under certain circumstances, R.O.C. law requires us to reserve from 10% to 15% of any offerings of our new common shares for employees’ subscription.

Our employees participate in our profit distribution pursuant to our articles of incorporation. Employees are entitled to receive additional bonuses based on a certain percentage of our allocable surplus income. On February 24, 2022, our board of directors proposed an employee bonus in cash in the aggregate amount of NT$4,771 million (US$172 million) in relation to retained earnings in 2020.

Our employees are not covered by any collective bargaining agreements. We believe we have a good relationship with our employees.

E. Share Ownership

As of March 31, 2022, each of our directors and executive officers held common shares and/or ADSs of UMC, either directly for their own account or indirectly as the representative of another legal entity on our board of directors, except for Lih J. Chen, Jyuo-Min Shyu, Wenyi Chu, Kuang-Si Shiu and Wen-Shin Hsu our independent directors. As of April 10, 2022, our most recent record date, Hsun Chieh Investment Co. held approximately 441 million of our common shares, representing approximately 3.55% of our issued and outstanding share capital; Silicon Integrated Systems Corp. held approximately 285 million of our common shares, representing approximately 2.3% of our issued and outstanding share capital; Chairman Mr. Hung held approximately 49 million of our common shares, representing approximately 0.4% of our issued and outstanding share capital; and Ting-Yu Lin held approximately 13 million of our common shares, representing approximately 0.1% of our issued and outstanding share capital.

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ITEM 7 MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS

A. Major Shareholders

The following table sets forth information known to us with respect to the beneficial ownership of our common shares as of (i) March 29, 2022, our most recent record date, and (ii) as of certain record dates in each of the preceding three years, for (1) the shareholders known by us to beneficially own more than 2% of our common shares and (2) all directors and executive officers as a group. Beneficial ownership is determined in accordance with SEC rules.

	As of April 14, 2020			As of April 10, 2021			As of March 29, 2022
	Number of common shares beneficially owned			Number of common shares beneficially owned			Number of common shares beneficially owned		Number of common shares beneficially owned
Name of Beneficial Owner
Hsun Chieh Investment Co., Ltd. (1)		3.75	%		3.55	%		441,371,000		3.54	%
Silicon Integrated Systems Corp.		2.42	%		2.30	%		285,380,424		2.29	%
Directors and executive officers as a group		7.07	%		7.07	%		853,071,669		6.83	%

(1) 36.49% owned by United Microelectronics Corporation as of March 29, 2022.

None of our major shareholders have different voting rights from those of our other shareholders. To the best of our knowledge, we are not directly or indirectly controlled by another corporation, by any foreign government or by any other natural or legal person severally or jointly.

For information regarding our common shares held or beneficially owned by persons in the United States, see “Item 9. The Offer and Listing—A. Offer and Listing Details—Market Price Information for Our American Depositary Shares” in this Annual Report.

B. Related Party Transactions

From time to time we have engaged in certain transactions with our affiliates. The sales and purchase prices with related parties are determined through mutual agreement in reference to market conditions.

The following table shows our aggregate equity ownership interest, on a consolidated basis, in major related fabless design companies that we enter into transactions from time to time as of March 29, 2022.

Name	Ownership %
Silicon Integrated Systems Corp.		19.02
Faraday Technology Corp.		13.78

We provide foundry services to these fabless design companies and the sales price was determined through arms-length negotiation and mutual agreement in reference to market conditions. We generated total of NT$1,563 million, NT$2,110 million and NT$2,816 million (US$102 million) of our operating revenues in 2019, 2020 and 2021, respectively, from the provision of our foundry services to these two companies. For more information, please refer to Note 7 to our audited consolidated financial statements included in this Annual Report.

C. Interests of Experts and Counsel

Not applicable.

ITEM 8 FINANCIAL INFORMATION

A. Consolidated Statements and Other Financial Information

Please refer to Item 18 for a list of all financial statements filed as part of this Annual Report on Form 20-F.

Legal and Administrative Proceedings

We may, from time to time, become a party to various legal or administrative proceedings arising in the ordinary course of our business.

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On August 31, 2017, the Taichung District Prosecutors Office indicted us based on the Trade Secret Act of R.O.C., alleging that our employees misappropriated the trade secrets of Micron Technology, Inc., or Micron. On June 12, 2020, an adverse ruling issued by the District Court of Taichung in a suit alleged that UMC, two of its current employees and a former employee engaged in the misappropriation of trade secrets. UMC appealed against the sentence. On November 26, 2021, UMC and Micron announced a settlement agreement between the two companies for all legal proceedings worldwide (the “Settlement Agreement”). Accordingly, Micron submitted a motion to withdraw the case. On January 27, 2022, the Intellectual Property and Commercial Court announced its ruling of this case and UMC was sentenced to a fine of NT$20 million, subject to a two-year term of probation.

On December 5, 2017, Micron filed a civil action with similar cause against us with the United States District Court, Northern District of California. Micron claimed entitlement to the actual damages, treble damages and relevant fees and requested the court to issue an order that enjoins us from using its trade secrets in question. In accordance with the Settlement Agreement, the court issued a dismissal of the case with prejudice in January 2022.

On January 12, 2018, we filed three patent infringement actions with the Fuzhou Intermediate People’s Court against, among others, Micron (Xi’an) Co., Ltd. and Micron (Shanghai) Trading Co., Ltd., requesting the court to order the defendants to stop manufacturing, processing, importing, selling, and committing to sell the products deploying the infringing patents in question, and also to destroy all inventories and related molds and tools. On July 3, 2018, the Fuzhou Intermediate People’s Court granted preliminary injunction against the aforementioned two defendants, holding that the two defendants must immediately cease to manufacture, sell, and import products that infringe our patent rights. The court approved withdrawal of one of the patent infringement actions on our motion while the other two actions are still on trial. In accordance with the Settlement Agreement, UMC submitted a motion to withdraw the case, and the motion is currently pending.

The amounts of aforementioned fine from ruling of the Intellectual Property and Commercial Court and the worldwide settlement between UMC and MICRON have no material financial and operational effect on UMC’s business for the years presented.

On March 14, 2019, a putative class action complaint was filed in the United States District Court for the Southern District of New York against the Company and certain of its officers and/or directors, alleging violations of Section 10(b) of the Securities Exchange Act and Rule 10b-5 thereunder, arising out of an alleged scheme to misappropriate trade secrets. On May 3, 2021, the court approved the settlement reached between the plaintiffs and the defendants and UMC paid a settlement amount of US$3 million to be allocated to the class plaintiffs and reimbursement of legal fees of class plaintiffs. The settlement has no material financial and operational effect on UMC’s business.

Other than the abovementioned legal proceedings, we are not currently involved in any litigation or other proceedings that may have, or have had in the recent past, significant effects on our financial position or profitability.

Dividend Policy

As for our policy on dividend distributions, see “Item 10. Additional Information—B. Memorandum and Articles of Association—Dividends and Distributions”. On June 12, 2018, our shareholders approved a cash dividend of NT$0.7 per common share for an aggregate of NT$8,557,023,101. On June 12, 2018, our board of directors resolved to adjust the cash dividend ratio to NT$0.71164307 per common share because the number of outstanding common shares had changed as a result of our repurchase of treasury common shares. On June 12, 2019, our shareholders approved a cash dividend of NT$0.58 per common share for an aggregate of NT$6,916,104,855. On June 19, 2019, our board of directors resolved to adjust the cash dividend ratio to NT$0.58989396 per common share because the number of outstanding common shares had changed as a result of our repurchase of treasury common shares. On June 10, 2020, our shareholders approved a cash dividend of NT$0.75 per common share for an aggregate of NT$9,765,154,720. On June 29, 2020, our board of directors resolved to adjust the cash dividend ratio to NT$0.80395653 per common share because the number of outstanding common shares had changed as a result of our repurchase of treasury common share and the conversion of convertible bonds. On July 7, 2021, our shareholders approved a cash dividend of NT$1.60 per common share for an aggregate of NT$19,875,842,389. On July 7, 2021, our board of directors resolved to adjust the cash dividend ratio to NT$1.59988820 per common share because the number of outstanding common shares had changed as a result of cancellation and issuance of Restricted Stock Awards. On February 24, 2022, our board of directors proposed to distribute cash from capital surplus of NT$37,446,370,452 (approximately NT$3 per common share), which are expected to be approved at our annual general meeting on May 27, 2022.

The following table sets forth the cash dividends per share and stock dividends per share as a percentage of common shares outstanding paid during each of the years indicated in respect of common shares outstanding at the end of each such year, except as otherwise noted.

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	Cash Dividend per Share		Stock Dividend per Share		Total Number of Common Shares Issued as Stock Dividend		Number of Outstanding Common Shares at Year End
	NT$		NT$
2016		0.56501906		—		—		12,624,318,715
2017		0.50		—		—		12,624,318,715
2018		0.71164307		—		—		12,424,318,715
2019		0.58989396		—		—		11,724,318,715
2020		0.80395653		—		—		12,422,401,493
2021		1.59988820		—		—		12,483,247,566

(1) We declare stock dividends in an NT dollar amount per share, but we pay the stock dividends to our shareholders in the form of common shares. The amount of common shares distributed to each shareholders is calculated by multiplying the dividend declared by the number of common shares held by the given shareholders, divided by the par value of NT$10 per share. Fractional common shares are not issued but are paid in cash.

B. Significant Changes

For the significant subsequent events following the close of the last financial year up to the date of this Annual Report on Form 20-F, please refer to Note 10 to our audited consolidated financial statements included elsewhere in this Annual Report.

ITEM 9 THE OFFER AND LISTING

A. Offer and Listing Details

Market Information for Our Common Shares

Our common shares have been listed on the Taiwan Stock Exchange under the symbol “2303” since July 1985. There is no public market outside Taiwan for our common shares.

Market Information for Our American Depositary Shares

Our ADSs have been listed on the NYSE under the symbol “UMC” since September 19, 2000. The outstanding ADSs are identified by the CUSIP number 910873405. Each of our ADSs represents the right to receive five common shares.

As of March 31, 2022, there were a total of 122,461,277 ADSs listed on the NYSE. With certain limited exceptions, holders of common shares who are not R.O.C. persons are required to hold these common shares through a brokerage or custodial account in the R.O.C. As of March 31, 2022, 612,306,385 common shares were registered in the name of a nominee of JPMorgan Chase & Co., the depositary under the deposit agreement. JPMorgan Chase & Co. has advised us that, as of March 31, 2022, 122,461,277 ADSs representing these 612,239,735 common shares were held of record by Cede & Co., and 13,330 ADSs were held by U.S. registered shareholders. We have no further information as to common shares held or beneficially owned by U.S. persons.

B. Plan of Distribution

Not applicable.

C. Markets

The principal trading markets for our common shares are the Taiwan Stock Exchange and the New York Stock Exchange, on which our common shares trade in the form of ADSs.

D. Selling Shareholders

Not applicable.

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E. Dilution

Not applicable.

F. Expenses of the Issue

Not applicable.

ITEM 10 ADDITIONAL INFORMATION

A. Share Capital

Not applicable.

B. Memorandum and Articles of Association

The following statements summarize the material elements of our capital structure and the more important rights and privileges of shareholders conferred by the R.O.C. law and our articles of incorporation.

Objects and Purpose

The scope of business of UMC as set forth in Article 2 of our articles of incorporation, includes, among others, (i) integrated circuits; (ii) semiconductor parts and components; (iii) parts and components of microcomputers, microprocessors, peripheral support and system products; (iv) parts and components of semiconductor memory systems products; (v) semiconductor parts and components for digital transceiver product and system products; (vi) semiconductor parts and components for telecom system and system products; (vii) testing and packaging of integrated circuits; (viii) mask production; (ix) metals, derived fuels and chemical products generated simultaneously from our manufacturing process; (x) management consulting service in regard to sustainable development, energy/resources conservation technologies and semiconductor fab related affairs; (xi) clearance, recycle and disposal of waste and manufacturing outputs; research and development, design, production, sales, promotion and after-sale services related to our business; and (xii) export/import trade related to our business.

Directors

The R.O.C. Company Act and our articles of incorporation provide that our board of directors is elected by shareholders and is responsible for the management of our business. As of March 31, 2022, our board of directors consisted of nine directors, out of which five are independent directors. In the annual general meeting held on June 11, 2007, we amended our articles of incorporation to abolish the managing director mechanism. In the annual general meeting held on June 13, 2008, we amended our articles of incorporation to introduce the mechanism of an Audit Committee. The Chairman presides at all meetings of our board of directors, and also has the authority to represent our company. The term of office for our directors is three years, and our directors are elected by our shareholders by means of cumulative voting. The amendment to our articles of incorporation on June 11, 2007 also adopts a nomination system which provides that holders of one percent or more of the issued and outstanding shares of our company would be entitled to submit a roster of candidates to be considered for nomination to our company’s board of directors at an annual general meeting involving the election of directors. Pursuant to the R.O.C. Company Act, entity that owns our common shares may be elected as a director, in which case a natural person must be designated to act as the legal entity’s representative. A legal entity that is our shareholder may designate its representative to be elected as our director on its behalf. In the event several representatives are designated by the same legal entity, any or all of them may be elected. A director who serves as the representative of a legal entity may be removed or replaced at any time at the discretion of such legal entity, and the replacement director may serve the remainder of the term of office of the replaced director. As of March 31, 2022, two of our nine directors are representatives of other legal entities, as shown in “Item 6. Directors, Senior Management and Employees—A. Directors and Senior Management.”

According to the R.O.C. Company Act and the rules promulgated under the R.O.C. Securities and Exchange Act, a director who has a personal interest in a matter to be discussed at the meeting of the board of directors, shall explain the essential contents of such personal interest in the meeting of the board of directors. Moreover, where the spouse, a blood relative within the second degree of kinship of a director, or any company which has a controlling or subordinate relation with a director has interests in a matter to be discussed at the meeting of the board of directors, such director shall be deemed to have a personal interest in the matter. In case that such personal interest may impair the interests of us, such director shall abstain from joining the discussion and voting on such matter. In case that such director is the representative designated by a legal entity shareholder to be elected as our director and such legal entity shareholder has personal interest in the matter to be discussed at the meeting of the board of directors, the rules above mentioned shall also apply. Our articles of incorporation provide that our board of directors is authorized, by taking into account of the extent of his/her/its involvement of our operation activities and the value of his/her/its contribution, to determine the compensation for each director at a comparable rate adopted by other companies of the same industry regardless of the profit received by our company. In addition, according to our articles of incorporation, we may distribute a maximum of 0.2% of the annual profits before tax as remuneration to directors. Please refer to “—Dividends and Distributions” in this item below for more details. Our articles of incorporation do not impose a mandatory retirement age limit for our directors. Furthermore, our articles of incorporation do not impose a shareholding qualification for each director, while the laws and regulations require the aggregate shareholding of all directors, excluding independent directors, to meet certain thresholds considering the paid-in capital and the numbers of the independent directors. According to our current internal Loan Procedures, we shall not extend any loan to our directors.

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In order to strengthen corporate governance of companies in Taiwan, effective from January 1, 2007, the amended R.O.C. Securities and Exchange Act authorizes the R.O.C. FSC, after considering certain factors, including the scale, shareholding structure and business nature of a public company, to require that a public company, such as our company, meet certain criteria, including having at least two independent directors but not less than one fifth of the total number of directors.

In addition, pursuant to the R.O.C. Securities and Exchange Act, a public company is required to either establish an Audit Committee, or retain supervisors, provided that the R.O.C. FSC may, after considering the scale and business nature of a public company and other necessary situation, require the company to establish an Audit Committee in place of its supervisors. We have amended our articles of incorporation in the annual general meeting held on June 13, 2008, introducing the mechanism of an Audit Committee. On February 20, 2013, the R.O.C. FSC has ruled that a public company with certain scale or of certain business nature, including us, shall establish an Audit Committee instead of the supervisors. According to our articles of incorporation and audit committee charter, our Audit Committee is composed of all independent directors and performs the power and duties provided by applicable laws and regulations, including without limitation the powers and the duties of supervisors provided under the R.O.C. Company Act. A company is not allowed to maintain both supervisors and an Audit Committee, so we chose to eliminate our supervisors when we established our Audit Committee in 2009.

According to our current articles of incorporation, we may purchase directors and officers liability insurance for our directors, covering the liabilities incurred in relation to his/her/its operation of business and legally responsible for.

Common Shares

As of December 31, 2021, our authorized share capital was NT$260 billion, divided into 26 billion common shares, of which 12,483,247,566 common shares were issued and outstanding. All common shares presently issued are fully paid and in registered form, and existing shareholders are not subject to any capital calls. We do not have any outstanding warrants or option to purchase our common shares.

Preferred Shares

We amended our articles of incorporation in the annual general meeting held on June 10, 2020, adding Article 5-1, which provides the terms, and will serve as the basis of issuance, of Class A preferred shares. According to Article 5-1, the Class A preferred shares are, among others, convertible, redeemable, cumulative and with fixed duration and annual cash dividend rate. None of Class A preferred shares has been issued as of March 31, 2022.

Restricted Share Awards & Employee Compensation Program

To retain our employees, we issue equity-based compensation to the selected employees and management. The restricted shares will be awarded to if the financial performance meets 1) return on equity (ROE%) and 2) operating margin (OM%) criteria set forth in the Restricted Stock Awards Program.

The return on equity % (ROE%) and operating margin % (OM%) are used as performance indicators for the operational goals of the Company. The performance target for the two indicators are listed below, which shall be simultaneously fulfilled. Determination of fulfillment of the indicators will be based on the consolidated financial statements, audited by a certified public accountant, for the last fiscal year prior to the end of each vesting period.

Effective Date of Equity Based Compensation: July 9, 2020

Effective Date of Share Distribution: September 1, 2020

Equity Based Compensation Shares: 200.030 million shares

Effective Date of Share Distribution: June 9, 2021

Equity Based Compensation Shares: 1.268 million shares

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Indicator	Return on equity (ROE%)	Operating margin (OM%)
2 years after	6% or above	6% or above granting
3 years after	8% or above	8% or above granting
4 years after	10% or above	10% or above granting

New Shares and Preemptive Rights

New shares may only be issued with the prior approval of our board of directors. If our issuance of any new shares will result in any change in our authorized share capital, we are required under R.O.C. Company Act to amend our articles of incorporation and obtain approval of our shareholders in a shareholders’ meeting. We must also obtain the approval of, or submit a registration with, the R.O.C. FSC and the Science Park Administration. According to the R.O.C. Company Act, when a company issues capital stock for cash, 10% to 15% of the issue must be offered to its employees. In addition, if a listed company intends to offer new shares for cash, at least 10% of the issue must also be offered to the public. This percentage can be increased by a resolution passed at a shareholders’ meeting, which will reduce the number of new shares in which existing shareholders may have preemptive rights. Unless the percentage of the common shares offered to the public is increased by a resolution, existing shareholders of the company have a preemptive right to acquire the remaining 75% to 80% of the issue in proportion to their existing shareholdings. According to the Corporate Merger and Acquisition Act of the R.O.C., as effective on February 8, 2002 and amended on May 5, 2004 and July 8, 2015 which took effect on January 8, 2016, if new shares issued by our company are solely for the purpose of merger, acquisition, share swap or spin-off, the above-mentioned restrictions, including the employee stock ownership plan, the preemptive rights of the existing shareholders and the publicity requirement of a listed company, to such issuance of new common shares may not be applied.

Shareholder

We only recognize persons registered in our register as our shareholders. We may set a record date and close our register of shareholders for specified periods to determine which shareholders are entitled to various rights pertaining to our common shares.

Transfer of Common Shares

Under the R.O.C. Company Act, a company may issue individual share certificates or no certificate at all, to evidence common shares. Our articles of incorporation, provide that we may deliver common shares in book-entry form instead of by means of issuing physical share certificates. We have issued our common shares in uncertificated/scripless form since 2007. Therefore, the transfer of our common shares is carried out on the book-entry system. The settlement of trading of our common shares is normally carried out on the book-entry system maintained by the Taiwan Depository and Clearing Corporation. Transferees must have their names and addresses registered on our register in order to assert shareholder’s rights against us. Our shareholders are required to file their respective specimen seals with our share registrar, Horizon Securities Co., Ltd.

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Shareholders’ Meetings

We are required to hold an annual ordinary shareholders’ meeting once every calendar year within six months from the end of each fiscal year. Our board of directors may convene an extraordinary meeting whenever the directors deem necessary, and they may do so if requested in writing by shareholders holding no less than 3% of our issued shares who have held these common shares for more than a year. At least 15 days’ advance written notice must be given of every extraordinary shareholders’ meeting and at least 30 days’ advance written notice must be given of every annual ordinary shareholders’ meeting. In addition, shareholder(s) who have continuously held more than 50% of our issued common shares for a period of three months or longer may convene an extraordinary shareholders’ meeting without any approval of our board of directors. The period during which a shareholder holds the shares and the number of shares held by a shareholder shall be determined based on our register of shareholders as of the book close date of the relevant extraordinary shareholders’ meeting. Unless otherwise required by law or by our articles of incorporation, voting for an ordinary resolution requires an affirmative vote of a simple majority of those present. A distribution of cash dividends would be an example of an ordinary resolution. The R.O.C. Company Act and, in the case of certain merger and acquisition deals, the Corporate Merger and Acquisition Act, also provides that in order to approve certain major corporate actions, including any amendment of our articles of incorporation, dissolution, merger or spin-off, share swap, entering into, amendment, or termination of any contract for lease of the company’s business in whole, or for entrusted business, or for joint operation with others, on regular basis, the transfer of all or an essential part of the business or assets, accept all of the business or assets of any other company which would have a significant impact on our operations, removing directors or the distribution of dividend in stock form, a special resolution shall be adopted by the holders of the majority of our common shares represented at a shareholders’ meeting at which holders of at least two-thirds of our issued and outstanding common shares are present; provided that, in the case of a public company, such as our company, such resolution may be adopted by the holders of at least two-thirds of the common shares represented at a shareholders’ meeting at which holders of at least a majority of our issued and outstanding common shares are present; provided, further, that in the case of merger, spin-off, transfer of all or essential part of business or asset, or share swap which meets the specific criteria provided under the Corporate Merger and Acquisition Act, such as short-form merger/spin-off/share swap or whale-minnow merger/spin-off/share-swap (as defined therein), such corporate action can be approved by a board resolution adopted by majority consent at a meeting with at least two-thirds of our directors present without shareholders’ approval. Notwithstanding the foregoing, in the event such transaction will result in our delisting, the approval from holders of at least two-thirds of our issued and outstanding common shares is required.

Voting Rights

Each common share and Class A preferred share, if issued, is generally entitled to one vote and no voting discount will be applied. However, treasury shares and our shares held by (i) an entity in which we own more than 50% of the voting shares or paid-in capital, or (ii) a third party in which we and an entity controlled by us jointly own, directly or indirectly, more than 50% of the voting shares or paid-in capital are not entitled to any vote. Except as otherwise provided by law or our articles of incorporation, a resolution can be adopted by the holders of a simple majority of the issued and outstanding shares represented at a shareholders’ meeting. The quorum for a shareholders’ meeting to discuss the ordinary resolutions is a majority of the issued and outstanding shares. Pursuant to the R.O.C. Company Act amended on December 28, 2011, the election of directors by our shareholders shall be conducted by means of cumulative voting rather than other voting mechanisms adopted in our articles of incorporation. Except as otherwise provided under applicable laws and regulations, in all other matters, a shareholder must cast all his or her votes in the same manner when voting on any of these matters.

Our shareholders may be represented at an ordinary or extraordinary shareholders’ meeting by proxy if a valid proxy form is delivered to us five days before the commencement of the ordinary or extraordinary shareholders’ meeting, unless such proxy has been revoked no later than two days before the date of the shareholders’ meeting. Voting rights attached to our common shares exercised by our shareholders’ proxy are subject to the proxy regulation promulgated by the R.O.C. FSC.

Authorized by the R.O.C. Company Act, the R.O.C. FSC has issued an administrative order on February 20, 2012 to require Taiwan Stock Exchange-listed companies, such as our company, and Taipei Exchange (previously known as “GreTai Securities Market”)-listed companies in the R.O.C. with NT$10 billion or more of paid-in share capital and with 10,000 or more shareholders as of the first date of the close period applicable to the shareholders’ meeting to adopt an e-voting system for the shareholders’ meeting. According to the administrative order by the R.O.C. FSC, commencing from January 1, 2018, all listed companies shall adopt the e-voting system for the shareholders’ meeting. The e-voting system provides a new platform for shareholders to exercise their voting rights online. As a company that meets the foregoing criteria, we have successfully adopted the e-voting system in the 2012 shareholders’ meeting and voted by poll on each agenda item for discussion.

Any shareholder who has a personal interest in a matter to be discussed at our shareholders’ meeting, the outcome of which may impair our interests, shall not vote or exercise voting rights on behalf of another shareholder on such matter.

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According to the R.O.C. Company Act amended on January 4, 2012, a shareholder of a public company who holds common shares for others, such as a depositary, may choose to exercise his/her/its voting power separately. On April 13, 2012, R.O.C. FSC promulgated the Regulations Governing the Split Voting of the Shareholders and Compliance Matters for Public Companies, the implementation rules of such split voting method, which stipulates that the depository of the overseas depositary receipts may exercise its voting power separately in accordance with the instructions of the respective holders of the ADS. Notwithstanding the foregoing, before any amendment to the currently effective Deposit Agreement is made, holders of our ADSs generally will not be able to exercise voting rights on the common shares underlying their ADSs on an individual basis.

Dividends and Distributions

We are not allowed under R.O.C. law to pay dividends on our treasury shares. We may distribute dividends on our issued and outstanding shares if we have earnings. Before distributing a dividend to shareholders, among other things, we must recover any past losses, pay all outstanding taxes and set aside a legal reserve equivalent to 10% of our net income and other profit (or loss) items adjusted to the current year’s undistributed earnings other than net income until our legal reserve equals our paid-in capital, and a special reserve, if any.

At an annual ordinary shareholders’ meeting, our board of directors submits to the shareholders for their approval proposals for the distribution of dividends or the making of any other distribution to shareholders from our net income or reserves for the preceding fiscal year. Dividends are paid to shareholders proportionately. Dividends may be distributed either in cash or in common shares or a combination of cash and shares, as determined by the shareholders at such meeting. Previously, the employee bonus and directors’ remuneration were categorized as “profit sharing” items and were calculated and distributed based on earnings after tax basis. However, according to Articles 235 and 235-1 of the R.O.C. Company Act, both amended and added on May 20, 2015, employee bonus and directors’ remuneration shall no longer be a profit sharing item but shall be calculated based on earnings before tax and distributed as “expenses.” Our articles of incorporation currently in effect, provide that where we make profits before tax for the annual financial year, subject to a board resolution adopted by majority consent at a meeting with at least two-thirds of our directors present, we shall appropriate (i) no less than 5% of such annual profits before tax as employee bonus, and (ii) a maximum of 0.2% as directors’ remunerations. The employees eligible for the distribution include our employees and employees of our subsidiaries and the form of employee bonus may be made in stock or cash. The qualification of such employees is to be determined by our board of directors. Notwithstanding the foregoing, if we have accumulated losses of the previous years, we shall set aside the amount of such accumulated losses prior to the allocation of the employee bonus and the above directors’ remuneration. For the purpose of calculation of the above employee bonus and the directors’ remunerations, such “annual profits before tax” shall be without giving effect of the deduction and distribution of such employee bonus and the directors’ remunerations.

The remaining amount may be distributed according to the distribution plan proposed by our board of directors based on our dividend policy, and submitted to the shareholders’ meeting for approval. Our articles of incorporation also specify that the amount distributable as dividend shall be the sum of (x) the balance of our earnings deducted by (i) payment of all taxes and dues, (ii) deduction of any past losses, (iii) allocation of 10% of our net income as a statutory reserve (which may be exempted if the accumulated amount of legal reserve has amounted to our paid-in capital); and (iv) special reserve, if any, plus (y) the retained earnings of previous years; provided, however, that the cash dividend to Class A preferred shares, if issued, shall be distributed in priority to the distribution of dividend to the common shares. In the annual general meeting held in June 2005, our shareholders approved a change of the percentage of stock dividend issued to our shareholders, if any, to no more than 80% and cash dividend, if any, to no less than 20%.

In addition to permitting dividends to be paid out of net income, we are permitted under the R.O.C. Company Act to make distributions to our shareholders of additional common shares by capitalizing reserves, including the legal reserve and capital surplus of premiums from issuing stock and earnings from gifts received, or make such distributions by cash, if we do not have losses. However, where legal reserve is distributed by capitalization or in cash, only the portion of legal reserve which exceeds 25 percent of the paid-in capital may be distributed.

For information as to R.O.C. taxes on dividends and distributions, see “—R.O.C. Tax Considerations” in this Item.

Repurchase of Our Common Shares

An R.O.C. company may not acquire its own common shares, except under certain exceptions provided in the R.O.C. Company Act or the R.O.C. Securities and Exchange Act. Under the R.O.C. Company Act, a company may purchase up to 5% of its issued common shares for transfer to employees as employee compensation in accordance with a resolution of its board of directors, passed by a majority vote, at a meeting with at least two-thirds of the directors present.

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Under Article 28-2 of the R.O.C. Securities and Exchange Act, we may, by a board resolution adopted by majority consent at a meeting with two-thirds or more of our directors present, purchase up to 10% of our issued common shares on the Taiwan Stock Exchange or by a tender offer, in accordance with the procedures prescribed by the R.O.C. FSC, for any of the following purposes:

• to transfer our common shares to our employees as employee compensation;

• to transfer upon conversion of bonds with warrants, preferred shares with warrants, convertible bonds, convertible preferred shares or certificates of warrants issued by us; or

• if necessary, to maintain our credit and our shareholders’ equity; provided that the common shares so purchased shall be canceled thereafter.

We have from time to time announced plans, none of which was binding on us, to buy back up to a fixed amount of our common shares on the Taiwan Stock Exchange at the price range set forth in the plans disclosed in “Item 16E—Purchase Of Equity Securities By The Issuer And Affiliated Purchasers.” We may not spend more than the aggregate amount of the retained earnings, the premium from issuing stock and the realized portion of the capital reserve to purchase our common shares. Historically, we have cancelled some of the repurchased common shares and transferred some of the repurchased common shares to our employees as employee compensation. In 2010, 2013 and 2015, we purchased an aggregate of 300 million, 200 million and 200 million, respectively, of our common shares under these plans. From February 3, 2010 to April 2, 2010, we purchased 300 million of our common shares on the Taiwan Stock Exchange at an average price of NT$16.15 per share to transfer to our employees as employee compensation. From March 14, 2013 to May 13, 2013, we purchased 200 million of our common shares on the Taiwan Stock Exchange at an average price of NT$11.23 per share to transfer to our employees as employee compensation. From July 30, 2015 to September 29, 2015, we purchased 200 million of our common shares on the Taiwan Stock Exchange at an average price of NT$11.02 per share to transfer to our employees as employee compensation. From May 12, 2016 to July 11, 2016, we purchased 200 million of our common shares on the Taiwan Stock Exchange at an average price of NT$11.98 per share to transfer to our employees as employee compensation. From June 8, 2020 through August 7, 2020, we purchased 105 million of our common shares on the Taiwan Stock Exchange at an average price of NT$ 15.98 per share to transfer to our employees as employee compensation. During 2019, 2020 and 2021, we purchased an aggregate of 220 million, 105 million and nil, common shares, respectively, and transferred nil, 105 million and nil of such common shares that we repurchased under these plans to our employees as employee compensation in 2019, 2020 and 2021, respectively.

We may not pledge or hypothecate any purchased common shares. In addition, we may not exercise any shareholders’ rights attached to such common shares. In the event that we purchase our common shares on the Taiwan Stock Exchange, our affiliates, directors, managers and their respective spouses and minor children and/or nominees are prohibited from selling any of our common shares during the period in which we purchase our common shares.

In addition to the share purchase restriction, the R.O.C. Company Act provides that our subsidiaries may not acquire our common shares or the equity securities of our majority-owned subsidiaries if the majority of the outstanding voting equity securities or paid-in capital of such subsidiary is directly or indirectly held by us.

Liquidation Rights

In the event of a liquidation, shareholders will be entitled to participate in any surplus assets after payment of all debts, liquidation expenses and taxes proportionately.

Rights to Bring Shareholders’ Suits

Under the R.O.C. Company Act, a shareholder may bring suit against us in the following events:

• within 30 days from the date on which a shareholders’ resolution is adopted, a shareholder may file a lawsuit to annul a shareholders’ resolution if the procedure for convening a shareholders’ meeting or the method of resolution violates any law or regulation or our articles of incorporation. However, if the court is of the opinion that such violation is not material and does not affect the result of the resolution, the court may reject the shareholder’s claim.

• if the substance of a resolution adopted at a shareholders’ meeting contradicts any applicable law or regulation or our articles of incorporation, a shareholder may bring a suit to determine the validity of such resolution.

Shareholders may bring suit against our directors under the following circumstances:

• Shareholder(s) who have continuously held 1% or more of our issued common shares for a period of six months or longer may request in writing that the Audit Committee institutes an action against a director on our behalf. In case the Audit Committee fails to institute an action within 30 days after receiving such request, the shareholder (s) may institute an action on our behalf. In the event shareholder(s) institute an action, a court may, upon the defendant’s motion, order such shareholder (s) to furnish appropriate security.

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• Shareholder (s) who hold more than 3% or more of our total issued common shares may institute an action with a court to remove a director of ours who has materially violated the applicable laws or our articles of incorporation or has materially damaged the interests of our company if a resolution for removal on such grounds has first been voted on and rejected by our shareholders and such suit is filed within 30 days of such shareholders’ vote.

• In the event that any director, manager or shareholder holding more than 10% of our common shares or any respective spouses or minor children and/or nominees of any of them sells common shares within six months after acquisition of such common shares, or repurchases the common shares within six months after the sale, we may claim for recovery of any profits realized from the sale and purchase. If our board of directors or Audit Committee fail to claim for recovery, any shareholder may set forth a 30-day period for our board of directors or Audit Committee to exercise the right. In the event our directors or audit committee fail to exercise the right during such 30-day period, such requesting shareholder shall have the right to claim such recovery on our behalf. Our directors shall be jointly and severally liable for damages suffered by us as a result of their failure to exercise the right of claim.

Other Rights of Shareholders

Under the R.O.C. Company Act and the Corporate Merger and Acquisition Act, dissenting shareholders are entitled to appraisal rights in the event of a spin-off or a merger and various other major corporate actions. Dissenting shareholders may request us to redeem all their common shares at a then fair market price to be determined by mutual agreement. If no agreement can be reached, the valuation will be determined by a court. Subject to applicable law, dissenting shareholders may, among other things, exercise their appraisal rights by notifying us in writing before the related shareholders’ meeting and/or by raising and registering their dissent at the shareholders’ meeting and also waive their voting rights.

One or more shareholders who have held 3% or more of the issued and outstanding shares one year or longer may require our board of directors to call an extraordinary shareholders’ meeting by sending a written request to our board of directors. In addition, shareholder(s) who have continuously held more than 50% of our issued shares for a period of three months or longer may convene an extraordinary shareholders’ meeting without any approval of our board of directors. The period during which a shareholder holds the shares and the number of shares held by a shareholder shall be determined based on our register of shareholders as of the book close date of the relevant extraordinary shareholders’ meeting.

Moreover, the R.O.C. Company Law allows shareholder(s) holding 1% or more of the total issued shares of a company to, during the period of ten days or more prescribed by the company, submit one proposal in writing or by way of electronic transmission containing no more than three hundred words (in terms of Chinese characters) for discussion at the annual ordinary shareholders’ meeting.

Financial Statements

For a period of at least 10 days before our annual ordinary shareholders’ meeting, we must make available our annual financial statements at our principal offices in Hsinchu, Taiwan, and our share registrar in Taipei for our shareholders’ inspection.

Transfer Restrictions

Our directors, managers and shareholders holding more than 10% of our shares are required to report any changes in their shareholding to us on a monthly basis. In addition, the number of common shares that they can sell or transfer on the Taiwan Stock Exchange on a daily basis is limited by R.O.C. law. Further, they may sell or transfer our common shares on the Taiwan Stock Exchange only after reporting to the R.O.C. FSC at least three days before the transfer, provided that such reporting is not required if the number of common shares transferred does not exceed 10,000 in one business day.

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C. Material Contracts

Supply and Marketing

The Company has signed sales and service contracts with the following companies to grasp the current situation of the global market. In addition, UMC maintains long-term business relationships with major wafer material suppliers. The main supply and sales contracts are as follows:

Contract Type	Contracted Party	Contract Period	Key Content	Restrictive Clause
Sales	UMC Group (USA)	Jan. 1, 2019~ Dec. 31, 2024	Sales and related services for semiconductor products	None
Service	United Microelectronics (Europe) B.V.	Jan. 1,2018~ Dec. 31, 2022	Marketing support service for semiconductor products	None
Service	UMC Korea Co., Ltd.	Jan. 1, 2021~ Dec. 31, 2025	Marketing support service for semiconductor products	None
Service	HeJian Technology (Suzhou) Co., Ltd.	Jan. 1, 2020~ Dec. 31, 2024	Marketing support service for semiconductor products	None
Service	United Semiconductor Japan Co., Ltd.	Jan. 1, 2020~ Dec. 31, 2024	Marketing support service for semiconductor products	None
Purchase	Shin-Etsu Handotai Taiwan Co., Ltd.	Indefinite	Wafer material supply	None

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Patent and Technology Licenses

UMC values and protects intellectual property rights. With over 40 years dedication in earning semiconductor patents, UMC has achieved a predominant position in the semiconductor industry. UMC also enters into patent or technology license contracts with major semiconductor or technology patent holders to ensure that UMC’s customers are not subject to the risk of wafer process infringement. The following are patent licensing contracts received and given by UMC:

Contract Type	Contracted Party	Contract Period	Key Content	Restrictive Clause
Patent cross-license	International Business Machines Corporation	Jun. 25, 2009~ Jun. 30, 2029	Patent cross-licensing for semiconductor process, semiconductor device and semiconductor design.	None
Technology license	International Business Machines Corporation	From Jun. 29, 2012	IBM licensed its 20nm CMOS and FinFET technology to UMC.	None
Patent license	Conversant Intellectual Property Management Inc. & Conversant IP (Taiwan) Inc.	From Feb. 8, 2018	License for specific patents.	None
Patent cross-license	International Business Machines Corporation	Jun. 13, 2013~ Dec. 30, 2035	Patent cross-license for semiconductor process, semiconductor device and semiconductor design.	None
Technology license	HeJian Technology (Suzhou) Co., Ltd.	Jul. 11, 2013~ Jul. 10, 2028	UMC licensed its 0.13um process technology to HeJian Technology (Suzhou) Co., Ltd.	UMC signed and implemented the contract in accordance with the scope approved by the Investment Commission, Ministry of Economic Affairs.
Technology license	Mie Fujitsu Semiconductor Limited	From Aug. 29, 2014	UMC licensed its 40nm process technology to Mie Fujitsu Semiconductor Limited.	None
Patent cross-license	Avago Technologies International Sales Pte. Limited	Sep. 29, 2018 ~ Dec. 31, 2023	Patent cross-license for semiconductor device related patents.	None
Patent cross-license	Katana Silicon Technologies, LLC	From Nov. 5, 2019	License for specific patents.	None
Technology license	United Semiconductor (Xiamen) Co., Ltd	Apr. 1, 2017~ Mar. 31, 2022	UMC licensed its 28nm process technology to United Semiconductor (Xiamen) Co., Ltd.	UMC signed and implemented the contract in accordance with the scope approved by the Investment Commission, Ministry of Economic Affairs.
Technology license	United Semiconductor (Xiamen) Co., Ltd	Nov. 23, 2018~ Nov. 22, 2028	UMC licensed its 80/90nm process technology to United Semiconductor (Xiamen) Co., Ltd.	UMC signed and implemented the contract in accordance with the scope approved by the Investment Commission, Ministry of Economic Affairs.
Patent cross-license	Polaris Innovation Limited	From Mar. 20, 2020	License for specific patents.	None

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Construction

Contract Type	Contracted Party	Contract Date	Key Content	Restrictive Clause
Construction	Wholetech System Hitech Limited, Organo Technology Co., Ltd., ECO Technical Services Co., Ltd., Asia IC Mic-process Inc., Nova Technology Corp., Allis Electric Co. Ltd., L&K Engineering Co. Ltd. and others.	From Jan., 2021	For building the facilities of Fab 12A in the Southern Taiwan Science Park, UMC signed construction contracts with the vendors including but not limited to those major vendors listed in the second column. The total contracted amount exceeded NTD12.6 billion.	None
Construction	Xiamen Dobest Trading Co.,Ltd., L&K Engineering (Suzhou) Co., Ltd., Hengyuan Allis Electric Co., Ltd., Top Chemical (Shenzhen) Co., Ltd., and others.	Jan. 1,2021~ Dec. 31,2022	United Semiconductor (Xiamen) Co., Ltd entered into construction contracts with the vendors including but not limited to those major vendors listed in the second column for building fab facilities. The total contracted amount exceeded USD630.92 million.	None
Construction	Suzhou Topco Construction Ltd.	August 1, 2011 ~ Jun. 30, 2022	HeJian Technology (Suzhou) Co., Ltd. entered into construction contracts with the vendors listed in the second column for HeJian New Phosphorus Wastewater Treatment System. The total contracted amount exceeded RMB12.87 million (excluding tax).	None
Construction	L&K Engineering (Suzhou) Co., Ltd.	May 01, 2021 ~ March 31, 2022	HeJian Technology (Suzhou) Co., Ltd. entered into construction contracts with the vendors listed in the second column for expanding HeJian’s 85K manufacture capacity. The total contracted amount exceeded RMB108.8 million (excluding tax).	None
Construction	China Construction First Building (Group) Corporation Limited	Feb. 01, 2021~ Dec. 31, 2021	HeJian Technology (Suzhou) Co., Ltd. entered into construction contracts with the vendors listed in the second column for HeJian new ammonia nitrogen & nitrogen total wastewater treatment room construction. The total contracted amount exceeded RMB13.87 million (excluding tax).	None

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D. Exchange Controls

Foreign Investment and Exchange Controls in Taiwan

We have extracted from publicly available documents the information presented in this section. Please note that citizens of the People’s Republic of China and entities organized in the People’s Republic of China are subject to special R.O.C. laws, rules and regulations, which are not discussed in this section.

General

Historically, foreign investments in the securities market of Taiwan were restricted. However, commencing in 1983, the Taiwan government has from time to time enacted legislation and adopted regulations to make foreign investment in the Taiwan securities market possible. Initially, only overseas investment trust funds of authorized securities investment trust enterprises established in Taiwan were permitted to invest in the Taiwan securities market. Since January 1, 1991, qualified foreign institutional investors are allowed to make investments in the Taiwan public securities market. Since March 1, 1996, non-resident foreign institutional and individual investors, called “general foreign investors”, are permitted to make direct investments in the Taiwan public securities market. On September 30, 2003, the Executive Yuan amended the Regulations Governing Investment in Securities by Overseas Chinese and Foreign Nationals, or the Investment Regulations, under which the “Qualified Foreign Institutional Investors”, or QFII, designations have been abolished and the restrictions on foreign portfolio investors have been revised. According to the Investment Regulations, “Foreign Institutional Investor”, or FINI, means an entity which is incorporated under the laws of countries other than the R.O.C. or the branch of a foreign entity that is established within the territory of the R.O.C., and “Foreign Individual Investor”, or FIDI, means an overseas Chinese or a foreign natural person. In addition, the Investment Regulations also lifted some restrictions and simplified procedures of investment application.

On April 30, 2009, the R.O.C. FSC promulgated regulations allowing QDIIs under PRC regulations and certain other PRC persons to invest in the securities of R.O.C. companies. However, prior approval from the Investment Commission of the R.O.C. Ministry of Economic Affairs is required for QDIIs or certain other PRC persons to own 10% or more of the issued and outstanding share capital of a listed R.O.C. company.

Foreign Ownership Limitations

Foreign ownership of the issued share capital in a Taiwan Stock Exchange-listed company or a Taipei Exchange-listed company has been limited to 50% in the past. Since December 30, 2000, the 50% limit has been lifted. Foreign investors can now hold such investments without any foreign ownership percentage limitations, unless the law has imposed restrictions otherwise.

Foreign Investors

Each FINI who wishes to invest directly in the R.O.C. securities market is required to register with the Taiwan Stock Exchange and obtain an investment identification number if the FINI is a non-resident and has no sub-investment accounts in the R.O.C. Each FIDI who wishes to invest directly in the R.O.C. securities market is also required to register with the Taiwan Stock Exchange and obtain an investment identification number. The R.O.C. FSC has lifted the limitation on the amount of investment in the R.O.C. securities market for a non-resident FIDI Except for some restrictions imposed by specific laws and regulations, the individual and aggregate foreign ownership of the issued share capital in a Taiwan Stock Exchange-listed company or a Taipei Exchange-listed company is not restricted. An R.O.C. custodian for a non-resident FINI or FIDI is required to submit to the CBC, and the Taiwan Stock Exchange a report of trading activities, inward and outward remittance of capital and status of assets under custody and other matters every month. Foreign institutional investors are not subject to any ceiling for investment in the R.O.C. securities market.

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Foreign Investment Approval

Foreign investors (both institutional and individual) who wish to make direct investments in the common shares of R.O.C. companies are required to submit a “foreign investment approval” application to the Investment Commission of the R.O.C. MOEA, or other government authority and enjoy benefits granted under the Statute for Foreigner’s Investment and the Statute for Overseas Chinese’s Investment. The Investment Commission of the R.O.C. MOEA or other government authority reviews each foreign investment approval application and approves or disapproves the application after consultation with other governmental agencies, if necessary. Any non-R.O.C. person possessing a foreign investment approval may repatriate annual net profits and interests attributable to an approved investment. Investment capital and capital gains attributable to the investment may be repatriated with approval of the Investment Commission of the R.O.C. MOEA or other government authority.

In addition to the general restrictions against direct investments by foreign investors in R.O.C. companies, foreign investors are currently prohibited from investing in certain prohibited industries in Taiwan under the “Negative List”. The prohibition on direct foreign investment in the prohibited industries in the Negative List is absolute in the absence of a specific exemption from the application of the Negative List. Under the Negative List, some other industries are restricted so that foreign investors may directly invest only up to a specified level and with the specific approval of the relevant authority responsible for enforcing the legislation that the Negative List is intended to implement. Our business does not operate in a restricted industry under the Negative List.

In June 2009, the R.O.C. MOEA further allowed PRC persons to make direct investments in Taiwan. However, such direct investment is still subject to various restrictions, such as that that only the industries listed in the Positive List, as promulgated by the Executive Yuan, are legally permitted targets and that all the PRC persons who wish to make direct investments in R.O.C. are required to submit an “investment approval” application to the Investment Commission of the R.O.C. MOEA.

Exchange Controls

Taiwan’s Foreign Exchange Control Statute and regulations provide that all foreign exchange transactions must be executed by banks designated to handle foreign exchange transactions by the Ministry of Finance and the CBC. Current regulations favor trade-related foreign exchange transactions. Consequently, foreign currency earned from exports of merchandise and services may now be retained and used freely by exporters. All foreign currency needed for the importation of merchandise and services may be purchased from the designated foreign exchange banks.

Aside from trade-related foreign exchange transactions, R.O.C. companies and residents may remit to and from Taiwan foreign currencies of up to US$50 million (or its equivalent) and US$5 million, (or its equivalent) respectively in each calendar year; provided, however, that depending on the economic and financial situation as well as the need to maintain the order of foreign exchange market, the CBC may, at its discretion, to adjust such limits. These limits apply to remittances involving a conversion between NT dollars and U.S. dollars or other foreign currencies. A requirement is also imposed on all private enterprises to register all medium- and long-term foreign debt with the CBC.

In addition, foreign currency earned from or needed to be paid for direct investment or portfolio investments, which are approved by the competent authorities, may be retained or sold by the investors or purchased freely from the designated bank.

Aside from the transactions discussed above, a foreign person without an alien resident card (or who has relevant resident card with a validity of less than one year) or an unrecognized foreign entity may remit to and from Taiwan foreign currencies of up to US$100,000 per remittance without obtaining prior approval or permit if required documentation is provided to Taiwan authorities. This limit applies to remittances involving a conversion between NT dollars and U.S. dollars or other foreign currencies.

Depositary Receipts

In April 1992, the R.O.C. SFB (the predecessor of the R.O.C. FSC) began allowing R.O.C. companies listed on the Taiwan Stock Exchange to sponsor the issuance and sale of depositary receipts evidencing depositary shares. Notifications for these issuances are still required. In December 1994, the Ministry of Finance began allowing companies whose shares are traded on the Taipei Exchange to sponsor the issuance and sale of depositary receipts evidencing depositary shares. On October 24, 2002, the R.O.C. SFB began allowing public companies that are not listed on the Taiwan Stock Exchange or the Taipei Exchange to sponsor the issuance and sale of depositary receipts by way of private placements outside the R.O.C.

A holder of depositary shares wishing to withdraw common shares underlying depositary shares is required to appoint a local agent or representative with qualifications set forth by the R.O.C. FSC to, among other things, open a securities trading account with a local brokerage firm, pay R.O.C. taxes, remit funds, and exercise shareholders’ right. In addition, the withdrawing holder is also required to appoint a custodian bank or a securities firm with qualifications set forth by the R.O.C. FSC to hold payments and the securities in safekeeping, make confirmations, settle trades and report all relevant information in which the securities firm is appointed as the custodian, and the payments be held in safekeeping in a special account opened in a bank approved by the R.O.C. FSC. Without making this appointment and the opening of accounts, the withdrawing holder would be unable to subsequently sell the common shares withdrawn from a depositary receipt facility on either the Taiwan Stock Exchange or the Taipei Exchange.

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After the issuance of a depositary share, a holder of the depositary share may immediately, comparing to a three-month waiting period restriction which was lifted in 2003, request the depositary issuing the depositary share to cause the underlying common shares to be sold in the R.O.C. or to withdraw the common shares represented by the depositary receipt and deliver the common shares to the holder. On April 30, 2009 and July 3, 2009, the R.O.C. Executive Yuan approved the Regulations Governing Securities Investment and Futures Trading in Taiwan by Mainland Area Investors and the Regulations Governing Investment in Taiwan by Mainland Area Persons, respectively, under which qualified PRC persons are permitted to invest in Taiwan companies under limited circumstances, including purchase of the depositary receipts issued by a Taiwan company. However, prior approval from the Investment Commission of the R.O.C. Ministry of Economic Affairs is required for a qualified PRC person’s ownership of 10% or more of the issued and outstanding share capital of a listed R.O.C. company or certain other manners of investment by a qualified PRC person.

No deposits of common shares may be made in a depositary receipt facility and no depositary receipts may be issued against deposits without specific R.O.C. FSC approval, unless they are:

(A) stock dividends;

(B) free distributions of common shares;

(C) due to the exercise by a holder of his or her preemptive rights in the event of capital increases for cash; or

(D) permitted under the deposit agreement and the custody agreement, due to the direct purchase of common shares or purchase through the depositary in the domestic market or the surrender of common shares under the possession of investors and then delivery of such common shares to the custodian for deposit in the depositary receipt facility, provided that the total number of depositary receipts outstanding after an issuance cannot exceed the number of issued depositary shares previously approved by the R.O.C. FSC in connection with the offering plus any depositary shares issued pursuant to the events described in (A), (B) and (C) above. These issuances may only be made to the extent previously issued depositary shares have been withdrawn.

A depositary may convert New Taiwan dollars from the proceeds of the sale of common shares or cash distributions received into other currencies, including U.S. dollars. A depositary may be required to obtain foreign exchange approval from the CBC on a payment-by-payment basis for conversion into New Taiwan dollars of subscription payments for rights offerings or conversion into foreign currencies from the proceeds from the sale of subscription rights for new common shares. It is expected that the CBC will grant this approval as a routine matter.

A holder of depositary shares may convert NT dollars into other currencies from proceeds from the sale of any underlying common shares. Proceeds from the sale of the underlying common shares withdrawn from the depositary receipt facility may be used for reinvestment in securities listed on both the Taiwan Stock Exchange and the Taipei Exchange, provided that the investor designates a local securities firm or financial institution as agent to open an NT dollar bank account in advance.

E. Taxation

R.O.C. Tax Considerations

The following summarizes the principal R.O.C. tax consequences of owning and disposing of the ADSs or common shares to a holder of ADSs or common shares that is not a resident of the R.O.C. A foreign individual holder will be considered as not a resident of the R.O.C., or a non-R.O.C. resident, for the purposes of this section if he or she is not physically present in Taiwan for 183 days or more during any calendar year. An entity holder will be considered as not a resident of the R.O.C., or a non-R.O.C. resident, if it is organized under the laws of a jurisdiction other than Taiwan for profit making purpose and has no fixed place of business or other permanent establishment or business agent in the R.O.C. Prospective purchasers of ADSs or common shares should consult their own tax advisors concerning the tax consequences of owning ADSs or common shares in the R.O.C. and any other relevant taxing jurisdiction to which they are subject.

Dividends

Dividends, whether in cash or common shares, declared by us out of retained earnings and paid out to a holder that is not an R.O.C. resident in respect of common shares represented by ADSs are subject to R.O.C. withholding tax at the time of distribution. The rate of withholding is currently 21% of the amount of the distribution in the case of cash dividends or of the par value of the common shares distributed in the case of stock dividends. Under current practice adopted by tax authorities, a 21% withholding rate is applied to a non-R.O.C. resident ADS holder without requiring the holder to apply for or obtain foreign investment approval. As discussed in the section “—Tax Reform” below, certain of our retained earnings will be subject to a certain percentage of undistributed retained earnings tax. There is no withholding tax with respect to stock dividends declared out of our capital surplus of premiums from issuing stock resulting from the capital paid by the shareholders.

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Capital Gains

In 2015, an amendment to the R.O.C. Income Tax Act then in effect, which deleted the provisions regarding the capital gain from securities transaction. was adopted and took effect from January 1, 2016, Accordingly, under the R.O.C. law currently in effect, gains realized on R.O.C. securities transactions are primarily exempt from income tax.

Subject to the AMT Act, gains realized from various securities transactions by an R.O.C.-resident entity shall be calculated as taxable income for the purpose of the AMT Act and may further be subject to income tax. If the above entity has held common shares for more than three (3) years, 50% of capital gain may be exempted from AMT. In addition, gains realized from transfers of ADSs by non-R.O.C. resident holders are not regarded as income from sources in the R.O.C. and, as a result, any gains derived therefrom are currently not subject to R.O.C. income tax.

Securities Transaction Tax

The R.O.C. government imposes a securities transaction tax that will apply to sales of common shares, but not to sales of ADSs. The securities transaction tax, which is payable by the seller, is generally levied on sales of common shares at the rate of 0.3% of the sales proceeds. Withdrawals of our common shares from our depositary facility are not subject to the R.O.C. securities transaction tax.

Preemptive Rights

Distribution of statutory preemptive rights for common shares by us in compliance with the R.O.C. Company Act is not subject to R.O.C. tax. Proceeds derived from sales of statutory preemptive rights evidenced by securities are subject to the R.O.C. securities transaction tax, currently at the rate of 0.3% of the gross amount received, as well as the R.O.C. securities income tax. Proceeds derived from sales of statutory preemptive rights that are not evidenced by securities are subject to capital gains tax at the rate of 20% of the gains realized for non-R.O.C. resident entities and non-R.O.C. resident individuals. Subject to compliance with the R.O.C. law, we have sole discretion to determine whether statutory preemptive rights are evidenced by securities or not.

Estate Taxation and Gift Tax

R.O.C. estate tax is payable on any property within the R.O.C. of a deceased individual who is a non-resident individual or a non-R.O.C. citizen and R.O.C. gift tax is payable on any property located within the R.O.C. donated by any such person. Under the Articles 13 and 19 of the R.O.C. Estate and Gift Tax Act, which became effective on May 12, 2017, tax brackets and rates of estate tax are as follows: (1) if the net taxable estate is no more than NT$50,000,000, the tax rate shall be 10%; (2) if the net taxable estate is more than NT$50,000,000 but no more than NT$100,000,000, the estate tax payable shall be NT$5,000,000 plus 15% for the amount in excess of NT$50,000,000; and (3) if the net taxable estate is more than NT$100,000,000, the estate tax payable shall be NT$12,500,000 plus 20% for the amount in excess of NT$100,000,000; tax brackets and rates of gift tax are as follows: (1) if the net taxable gifts are no more than NT$25,000,000, the tax rate shall be 10%; (2) if the net taxable gifts are more than NT$25,000,000 but no more than NT$50,000,000, the gift tax payable shall be NT$2,500,000 plus 15% for the amount in excess of NT$25,000,000; and (3) if the net taxable gifts are more than NT$50,000,000, the gift tax payable shall be NT$6,250,000 plus 20% for the amount in excess of NT$50,000,000. Under R.O.C. estate and gift tax laws, the common shares will be deemed located in the R.O.C. irrespective of the location of the owner. It is unclear whether a holder of ADSs will be considered to own common shares for this purpose.

Tax Treaties

The Republic of China does not have an income tax treaty with the United States. On the other hand, the Republic of China has income tax treaties with Indonesia, Singapore, South Africa, Australia, Vietnam, New Zealand, Malaysia, North Macedonia, Eswatini, the Netherlands, the United Kingdom, Gambia, Senegal, Sweden, Belgium, Denmark, Israel, Paraguay, Hungary, France, India, Slovakia, Switzerland, Germany, Thailand, Kiribati, Luxembourg, Italy, Japan, Canada, Poland, Austria, Czech Republic and Saudi Arabia which may limit the rate of Republic of China withholding tax on dividends paid with respect to common shares in Taiwan companies. It is unclear whether a non-R.O.C. holder of ADSs will be considered to own common shares for the purposes of such treaties. Accordingly, a holder of ADSs who is otherwise entitled to the benefit of a treaty should consult its own tax advisors concerning eligibility for benefits under the treaty with respect to the ADSs.

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Tax Reform

An amendment to the R.O.C. Income Tax Act was enacted on January 1, 1998, to integrate the corporate income tax and the shareholder dividend tax with the aim of eliminating the double taxation effect for resident shareholders of Taiwanese corporations. In order to improve Taiwan’s tax system and to keep up with the trend of international tax reform, the R.O.C. Income Tax Act was further amended in 2018 to replace the old tax system which integrated the corporate income tax and the shareholder dividend tax. Except for limited exceptions, the amendment shall take effect retroactively from January 1, 2018.

Under this amendment, a 10% retained earnings tax will be imposed on a company for its after-tax earnings generated after January 1, 1998 that are not distributed in the following year; while a 5% retained earning tax will be imposed for after-tax earnings generated from January 2018. The retained earnings tax so paid will further reduce the retained earnings available for future distribution. Under the old tax system, when we declared dividends out of those retained earnings, up to a maximum amount of half of the amount of such tax of the declared dividends was credited against the withholding tax imposed on the non-R.O.C. resident holders of our ADSs or common shares; while from January 1, 2019, the benefit no longer exists and no retained earnings tax is credited.

U.S. Federal Income Tax Considerations for U.S. Persons

The following is a summary of certain U.S. federal income tax consequences for beneficial owners of our common shares or ADSs that hold the common shares or ADSs as capital assets and that are U.S. holders that are not citizens of the R.O.C., do not have a permanent establishment in the R.O.C. and are not physically present in the R.O.C. for 183 days or more within a calendar year. You are a U.S. holder if you are, for U.S. federal income tax purposes, any of the following:

• an individual citizen or resident of the United States;

• a corporation (or other entity or arrangement treated as a corporation for U.S. federal income tax purposes) created or organized in or under the laws of the United States, any state thereof or the District of Columbia;

• an estate the income of which is subject to U.S. federal income taxation regardless of its source;

• a trust that is subject to the primary supervision of a court within the United States and that has one or more U.S. persons with the authority to control all substantial decisions of the trust; or

• a trust that has a valid election in effect under applicable U.S. Treasury regulations to be treated as a U.S. person.

This summary is based on the provisions of the Internal Revenue Code of 1986, as amended, or the Code, and regulations, rulings and judicial decisions thereunder as of the date hereof, and such authorities may be replaced, revoked or modified so as to result in U.S. federal income tax consequences different from those discussed below. It is for general purposes only and you should not consider it to be tax advice. In addition, it is based in part on representations by the depositary and assumes that each obligation under the deposit agreement and any related agreement will be performed in accordance with its terms. This summary does not represent a detailed description of all the U.S. federal income tax consequences to you in light of your particular circumstances and does not address the Medicare tax on net investment income or the effects of any state, local or non-U.S. tax laws (or other U.S. federal tax consequences, such as U.S. federal estate or gift tax consequences). In addition, it does not represent a detailed description of the U.S. federal income tax consequences applicable to you if you are subject to special treatment under the U.S. federal income tax laws, including if you are:

• a dealer in securities or currencies;

• a trader in securities if you elect to use a mark-to-market method of accounting for your securities holdings;

• a financial institution or an insurance company;

• a tax-exempt organization;

• a regulated investment company;

• a real estate investment trust;

• a person liable for alternative minimum tax;

• a person holding common shares or ADSs as part of a hedging, integrated or conversion transaction, constructive sale or straddle;

• a partnership or other pass-through entity for U.S. federal income tax purposes;

• a person owning, actually or constructively, 10% or more of our stock (by vote or value);

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• a person required to accelerate the recognition of any item of gross income with respect to our common shares or ADSs as a result of such income being recognized on an applicable financial statement; or

• a U.S. holder whose “functional currency” is not the U.S. dollar.

We cannot assure you that a later change in law will not alter significantly the tax considerations that we describe in this summary.

If a partnership (or other entity or arrangement treated as a partnership for U.S. federal income tax purposes) holds our common shares or ADSs, the tax treatment of a partner will generally depend upon the status of the partner and the activities of the partnership. If you are a partner of a partnership holding our common shares or ADSs, you should consult your tax advisor.

You should consult your own tax advisor concerning the particular U.S. federal income tax consequences to you of the ownership and disposition of the common shares or ADSs, as well as the consequences to you arising under the laws of any other taxing jurisdiction.

In general, for U.S. federal income tax purposes, a U.S. person who is the beneficial owner of an ADS will be treated as the owner of the common shares underlying its ADS. Accordingly, deposits or withdrawals of common shares by U.S. holders for ADSs generally will not be subject to U.S. federal income tax.

Taxation of Dividends

Except as discussed below with respect to the passive foreign investment company rules, the amount of distributions (including amounts withheld in respect of R.O.C. withholding taxes) you receive on your common shares or ADSs (other than certain pro rata distributions of common shares to all shareholders) will generally be treated as dividend income to you if the distributions are made from our current and accumulated earnings and profits as calculated according to U.S. federal income tax principles. Such income (including withheld taxes) will be includible in your gross income as ordinary income on the day you actually or constructively receive it, which in the case of an ADS will be the date actually or constructively received by the depositary. The amount of any distribution of property other than cash will be the fair market value of such property on the date it is distributed. You will not be entitled to claim a dividend received deduction with respect to distributions you receive from us.

With respect to non-corporate U.S. holders (including individuals), certain dividends received from a qualified foreign corporation may be subject to reduced rates of taxation. A foreign corporation is treated as a qualified foreign corporation with respect to dividends paid by that corporation on common shares (or ADSs backed by such common shares) that are readily tradable on an established securities market in the United States. U.S. Treasury Department guidance indicates that our ADSs (which are listed on the NYSE), but not our common shares, are readily tradable on an established securities market in the United States. Thus, subject to the discussion below with respect to the passive foreign investment company rules, we believe that dividends we pay on our ADSs will meet the conditions required for these reduced tax rates. Since we do not expect that our common shares will be listed on an established securities market in the United States, we do not believe that dividends we pay on our common shares that are not represented by ADSs currently meet the conditions required for these reduced tax rates. Moreover, there can be no assurance that our ADSs will continue to be readily tradable on an established securities market in later years. Non-corporate U.S. holders that do not meet a minimum holding period requirement during which they are not protected from the risk of loss or that elect to treat the dividend income as “investment income” pursuant to Section 163(d) (4) of the Code will not be eligible for the reduced rates of taxation regardless of our status as a qualified foreign corporation. In addition, the rate reduction will not apply to dividends if the recipient of a dividend is obligated to make related payments with respect to positions in substantially similar or related property. This disallowance applies even if the minimum holding period has been met. Non-corporate U.S. holders will also not be eligible for the reduced rates of taxation on dividends if we are a passive foreign investment company in the taxable year in which such dividends are paid or in the preceding taxable year. U.S. holders should consult their own tax advisors regarding the application of these rules given their particular circumstances.

The amount of any dividend paid in NT dollars will equal the U.S. dollar value of the NT dollars you receive (calculated by reference to the exchange rate in effect on the date you actually or constructively receive the dividend, which in the case of an ADS will be the date actually or constructively received by the depositary), regardless of whether the NT dollars are actually converted into U.S. dollars. If the NT dollars received as a dividend are converted into U.S. dollars on the date they are actually or constructively received, you generally will not be required to recognize foreign currency gain or loss in respect of the dividend income. If the NT dollars received as a dividend are not converted into U.S. dollars on the date of receipt, you will have a basis in the NT dollars equal to their U.S. dollar value on the date of receipt. Any gain or loss you realize if you subsequently sell or otherwise dispose of the NT dollars will be ordinary income or loss from sources within the United States for foreign tax credit limitation purposes.

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Subject to certain limitations under the Code, you may be entitled to a credit or deduction against your U.S. federal income taxes for any R.O.C. taxes that are withheld from dividend distributions made to you. The election to receive a credit or deduction must be made annually, and applies to all foreign taxes for the applicable tax year. The limitation on foreign taxes eligible for credit is calculated separately with respect to specific classes of income. For this purpose, dividends we pay with respect to common shares or ADS will generally be considered passive category income from sources outside the United States. Furthermore, you will not be allowed a foreign tax credit for foreign taxes imposed on dividends paid on common shares or ADSs if you (1) have held the common shares or ADSs for less than a specified minimum period during which you are not protected from risk of loss, or (2) are obligated to make payments related to the dividends. The rules governing the foreign tax credit are complex. We therefore urge you to consult your tax advisors regarding the availability of the foreign tax credit under your particular circumstances.

To the extent that the amount of any distribution you receive exceeds our current and accumulated earnings and profits for a taxable year, as determined under U.S. federal income tax principles, the distribution will first be treated as a tax-free return of capital, causing a reduction in your adjusted basis in the common shares or ADSs and thereby increasing the amount of gain, or decreasing the amount of loss, you will recognize on a subsequent disposition of the common shares or ADSs. The balance in excess of adjusted basis, if any, will be taxable to you as capital gain recognized on a sale or exchange. However, we do not expect to keep earnings and profits in accordance with U.S. federal income tax principles. Therefore, you should expect that a distribution will generally be treated as a dividend (as discussed above).

It is possible that pro rata distributions of common shares or ADSs to all shareholders may be made in a manner that is not subject to U.S. federal income tax. In the event that such distributions are tax-free, the basis of any new common shares or ADSs so received will generally be determined by allocating the U.S. holder’s basis in the old common shares or ADSs between the old common shares or ADSs and the new common shares or ADSs, based on their relative fair market values on the date of distribution. For U.S. federal income tax purposes, any such tax-free share or ADS distribution generally would not result in foreign source income to you. Consequently, you may not be able to use the foreign tax credit associated with any R.O.C. withholding tax imposed on such distributions unless you can use the credit against U.S. federal income tax due on other foreign source income in the appropriate category for foreign tax credit purposes. You should consult your own tax advisors regarding all aspects of the foreign tax credit.

Taxation of Capital Gains

Except as discussed below with respect to the passive foreign investment company rules, when you sell or otherwise dispose of your common shares or ADSs, you will generally recognize capital gain or loss in an amount equal to the difference between the U.S. dollar value of the amount realized for the common shares or ADSs and your basis in the common shares or ADSs, determined in U.S. dollars. If you are an individual or other non-corporate holder, and the common shares or ADSs being sold or otherwise disposed of are capital assets that you have held for more than one year, your gain recognized will be eligible for reduced rates of taxation. Your ability to deduct capital losses is subject to limitations. Any gain or loss you recognize will generally be treated as U.S. source gain or loss for foreign tax credit limitation purposes. Consequently, you may not be able to use the foreign tax credit arising from any R.O.C. tax imposed on the disposition of common shares or ADSs unless such credit can be applied (subject to applicable limitations) against tax due on other income treated as derived from foreign sources.

If you pay any R.O.C. securities transaction tax, such tax is not treated as an income tax for U.S. federal income tax purposes, and therefore will not be a creditable foreign tax for U.S. federal income tax purposes. However, subject to limitations under the Code, such tax may be deductible. You are urged to consult your tax advisors regarding the U.S. federal income tax consequences of these taxes.

Passive Foreign Investment Company

Based on the composition of our income and assets, and the valuation of our assets, we do not believe that we are currently (or that we were in 2021) a passive foreign investment company, or PFIC, and we do not expect to become one in the future, although there can be no assurance in this regard.

In general, a company is considered a PFIC for any taxable year if either:

• at least 75% of its gross income is passive income, which generally includes income derived from certain dividends, interest, royalties and rents (other than royalties and rents derived in the active conduct of a trade or business and not derived from a related person), annuities or property transactions; or

• at least 50% of the value of its assets is attributable to assets that produce or are held for the production of passive income.

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The 50% of value test is based on the average of the value of our assets for each quarter during the taxable year. If we own at least 25% by value of another company’s stock, we will be treated, for purposes of the PFIC rules, as owning our proportionate share of the assets and receiving our proportionate share of the income of that company.

In addition, the determination of whether we are a PFIC is made annually. Accordingly, it is possible that we may become a PFIC in the current or any future taxable year due to changes in our asset or income composition. A decrease in the price of our common shares and ADSs may also result in our becoming a PFIC. If we are a PFIC for any taxable year during which you hold common shares or ADSs, you will be subject to special tax rules discussed below.

If we are a PFIC for any taxable year during which you hold common shares or ADSs and you do not make a timely mark-to market election as described below, you will be subject to special tax rules with respect to any “excess distribution” that you receive and any gain you realize from a sale or other disposition (including a pledge) of common shares or ADSs. Distributions you receive in a taxable year that are greater than 125% of the average annual distributions you received during the shorter of the three preceding taxable years or your holding period for the common shares or ADSs will be treated as excess distributions. Under these special tax rules:

• the excess distribution or gain will be allocated ratably over your holding period for the common shares or ADSs;

• the amount allocated to the current taxable year, and any taxable year prior to the first taxable year in which we were a PFIC, will be treated as ordinary income; and

• the amount allocated to each other year will be subject to tax at the highest tax rate in effect for that year and the interest charge generally applicable to underpayments of tax will be imposed on the resulting tax attributable to each such year.

If you hold common shares or ADSs in any year in which we are a PFIC, you are generally required to file Internal Revenue Service Form 8621.

If we are a PFIC for any taxable year and any of our non-U.S. subsidiaries is also a PFIC, you would be treated as owning a proportionate amount (by value) of the common shares of the lower-tier PFIC for purposes of the application of these rules. You are urged to consult your tax advisors about the application of the PFIC rules to any of our subsidiaries.

Under certain circumstances, a U.S. holder, in lieu of being subject to the rules discussed above with respect to excess distributions and recognized gains, may make an election to include gain on the stock of a PFIC as ordinary income under a mark-to-market method provided that such stock is regularly traded on a qualified exchange (within the meaning of the applicable Treasury regulations). Under this method, any difference between the stock’s fair market value and its adjusted basis at the end of the year is accounted for by either an inclusion in income or, subject to limitations, a deduction from income, as described below. Under current U.S. Treasury Department guidance, the mark-to-market election may be available to holders of ADSs because the ADSs are listed on the NYSE, which constitutes a qualified exchange, although there can be no assurance that the ADSs will be “regularly traded” for purposes of the mark-to-market election. You should also note that only the ADSs and not the common shares are listed on the NYSE. Our common shares are listed on the Taiwan Stock Exchange, which must meet certain trading, listing, financial disclosure and other requirements to be treated as a qualified exchange under applicable U.S. Treasury regulations for purposes of the mark-to-market election, and no assurance can be given that the common shares will be “regularly traded” for purposes of the mark-to-market election.

If you make an effective mark-to-market election, you will include in income each year that we are a PFIC as ordinary income the excess of the fair market value of your common shares or ADSs at the end of the year over your adjusted tax basis in the common shares or ADSs. You will be entitled to deduct as an ordinary loss in each such year the excess of your adjusted tax basis in the common shares or ADSs over their fair market value at the end of the year, but only to the extent of the net amount previously included in income as a result of the mark-to-market election. If you make an effective mark-to-market election, in each year that we are a PFIC any gain you recognize upon the sale or other disposition of your common shares or ADSs will be treated as ordinary income and any loss will be treated as ordinary loss, but only to the extent of the net amount of previously included income as a result of the mark-to-market election.

Your adjusted tax basis in common shares or ADSs will be increased by the amount of any income inclusion and decreased by the amount of any deductions under the mark-to-market rules. If you make a mark-to-market election it will be effective for the taxable year for which the election is made and all subsequent taxable years unless the common shares or ADSs are no longer regularly traded on a qualified exchange or the Internal Revenue Service consents to the revocation of the election. You should consult your tax advisors about the availability of the mark-to-market election, and whether making the election would be advisable under your particular circumstances.

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Alternatively, a U.S. holder of common shares or ADSs in a PFIC can sometimes avoid the rules described above by electing to treat the PFIC as a “qualified electing fund” under Section 1295 of the Code. This option is not available to you because we do not intend to comply with the requirements necessary to permit you to make this election.

Non-corporate U.S. holders will not be eligible for reduced rates of taxation on any dividends received from us if we are a PFIC in the taxable year in which such dividends are paid or in the preceding taxable year. You should consult your own tax advisors concerning the U.S. federal income tax consequences of holding common shares or ADSs if we are considered a PFIC in any taxable year.

Information Reporting and Backup Withholding

In general, unless you are an exempt recipient such as a corporation, information reporting will apply to dividends in respect of the common shares or ADSs and to the proceeds from the sale, exchange or other disposition of your common shares or ADSs that are paid to you within the United States (and in some cases, outside of the United States). Additionally, if you fail to provide your taxpayer identification number, or fail either to report in full dividend and interest income or to make the necessary certifications of your exempt status, you may be subject to backup withholding.

Backup withholding is not an additional tax and any amounts withheld under the backup withholding rules will be allowed as a refund or a credit against your U.S. federal income tax liability, provided you furnish the required information to the Internal Revenue Service.

F. Dividends and Paying Agents

Not applicable.

G. Statement by Experts

Not applicable.

H. Documents on Display

We have filed this Annual Report on Form 20-F, including exhibits, with the SEC. As allowed by the SEC, in Item 19 of this Annual Report, we incorporate by reference certain information we filed with the U.S. SEC. This means that we can disclose important information to you by referring you to another document filed separately with the U.S. SEC. The information incorporated by reference is considered to be part of this Annual Report.

The SEC also maintains a website at www.sec.gov that contains reports, proxy statements and other information regarding registrants that file electronically with the SEC. Our Annual Report and some of the other information submitted by us to the SEC may be accessed through this web site.

I. Subsidiary Information

Not applicable.

ITEM 11 QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market risk is the risk of loss related to adverse changes in market prices, including interest rates and foreign exchange rates, of financial instruments. We are exposed to various types of market risks, including changes in interest rates and foreign currency exchange rates, in the normal course of business.

We use financial instruments, including variable rate debt and swaps and foreign exchange spot transactions, to manage risks associated with our interest rate and foreign currency exposures through a controlled program of risk management in accordance with established policies. These policies are reviewed and approved by our board of directors and shareholders’ meeting. Our treasury operations are subject to internal audit on a regular basis. We do not hold or issue derivative financial instruments for speculatively purposes.

Our primary market risk exposures relate to interest rate movements on borrowings and exchange rate movements on foreign currency-denominated accounts receivable, capital expenditures relating to equipment used in manufacturing processes (including lithography, etching and chemical vapor deposition) and purchased primarily from Europe, Japan and the United States.

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The following table provides information as of December 31, 2021 on our market risk sensitive financial instruments.

	As of December 31, 2021
	Carrying Amount		Fair Amount
	(in NT$ millions)
Time Deposits: Non-Trading Purpose		117,720		117,720
Accounts Receivable		27,346		27,346
Accounts Payable		3,977		3,977
Short-term Loans: Non-Trading Purpose		1,924		1,924
Bonds: Non-Trading Purpose		40,537		41,947
Long-term Loans: Non-Trading Purpose		36,625		36,625

Interest Rate Risk

Our major market risk exposure is changing interest rates. Our exposure to market risk for changes in interest rates relates primarily to our long-term debt obligations. We primarily enter into debt obligations to support general corporate purposes including capital expenditures and working capital needs.

The tables below provide information of UMC as of December 31, 2021 about our financial instruments that are sensitive to changes in interest rates, including debt obligations and certain assets. For debt obligations, the table presents principal cash flows and related weighted average interest rates by expected maturity dates. The information is presented in the currencies in which the instruments are denominated.

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	Expected Maturity Dates															As of December 31, 2021
	2022			2023			2024			2025			2026 and thereunder			Total			Fair Value
	(in millions, except percentages)
Time Deposits:
Fixed Rate (US$)		2,105															2,105			2,105
Average Interest Rate		0.19	%														0.19	%		0.19	%
Fixed Rate (SGD)		31															31			31
Average Interest Rate		0.29	%														0.29	%		0.29	%
Fixed Rate (RMB¥)
Average Interest Rate
Fixed Rate (NT$)		38,017															38,017			38,017
Average Interest Rate		0.24	%														0.24	%		0.24	%
Short-term Loans:
Variable Rate (US$)		31															31			31
Average Interest Rate		0.60	%														0.60	%		0.60	%
Variable Rate ((NT$)
Average Interest Rate
Variable Rate (€)
Average Interest Rate
Variable Rate (¥ JPY)
Average Interest Rate
Variable Rate (RMB¥)		244															244			244
Average Interest Rate		3.26	%														3.26	%		3.26	%
Unsecured Long-term Loans:
Variable Rate (NT$)		1,217			517			316			150			2,300			4,500			4,500
Average Interest Rate		1.03	%		1.03	%		1.03	%		1.03	%		1.03	%		1.03	%		1.03	%
Variable Rate (US$)					3			6			14			8			31			31
Average Interest Rate					1.11	%		1.11	%		1.11	%		1.11	%		1.11	%		1.11	%
Variable Rate (RMB¥)		100			3			5			11			6			1258			125
Average Interest Rate		3.90	%		3.95	%		3.95	%		3.95	%		3.95	%		3.95	%		3.91	%
Secured Long-term Loans:
Variable Rate (NT$)		61			78			78			67			27			311			311
Average Interest Rate		1.72	%		1.72	%		1.72	%		1.72	%		1.72	%		1.72	%		1.72	%
Variable Rate (US$)		520															520			520
Average Interest Rate		2.87	%														2.87	%		2.87	%
Variable Rate (RMB¥)		840			21			36			852			1,891			3,640			3,640
Average Interest Rate		4.43	%		4.43	%		4.43	%		4.43	%		4.43	%		4.43	%		4.43	%
Bonds:
Unsecured (NT$)		6,200															6,200			6212
Fixed Rate		1.15	%														1.15	%		1.15	%
Unsecured (NT$)		2,000															2,000			2,009
Fixed Rate		0.94	%														0.94	%		0.94	%
Unsecured (NT$)								3,000									3,000			3,034
Fixed Rate								1.95	%								1.95	%		1.95	%
Unsecured (NT$)								2,100									2,100			2,121
Fixed Rate								1.43	%								1.43	%		1.43	%
Unsecured (NT$)								3,400									3,400			3,463
Fixed Rate								1.13	%								1.13	%		1.13	%
Unsecured (NT$)														5,500			5,500			5,502
Fixed Rate														0.57	%		0.57	%		0.57	%
Unsecured (NT$)														5,000			5,000			5,000
Fixed Rate														0.63	%		0.63	%		0.63	%
Unsecured (NT$)														2,000			2,000			2,000
Fixed Rate														0.63	%		0.63	%		0.63	%
Unsecured (NT$)														2,100			2,100			2,100
Fixed Rate														0.68	%		0.68	%		0.68	%

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Foreign Currency Risk

Although the majority of our transactions are in NT dollars, some transactions are based in other currencies. The primary foreign currency to which we are exposed is the U.S. dollar. We have in the past, and may in the future, enter into short-term, foreign currency forward contracts to hedge the impact of foreign currency fluctuations on certain underlying assets, liabilities, and firm commitments for operating expenses and capital expenditures denominated in U.S. dollars and other foreign currencies. The purpose of entering into these hedges is to minimize the impact of foreign currency fluctuations on the results of operations. We use the policy of natural hedging to reduce our foreign exchange exposure arising out of changes in the rates of exchange among the U.S. dollar and other foreign currencies. As a general matter, our natural hedging strategy relies on matching revenues and costs for the same currency or offsetting losses in one currency with gains in another.

As of December 31, 2021, we had no outstanding in foreign currency forward contracts to sell U.S. dollars against NT dollars. We believe we do not have material market risk as of December 31, 2021

ITEM 12 DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES

A. Debt Securities

Not applicable.

B. Warrants and Rights

Not applicable.

C. Other Securities

Not applicable.

D. American Depositary Shares

Depositary Fees and Charges

Under the terms of the deposit agreement for our ADSs, an ADS holder may have to pay the following service fees to the depositary:

Service	Fees
Issuance of ADSs	Up to US$0.05 per ADS issued
Cancellation of ADSs	Up to US$0.05 per ADS canceled
Distribution of cash dividends or other cash distributions	Up to US$0.05 per ADS held
Distribution of ADSs pursuant to stock dividends, free stock distributions or exercises of rights	Up to US$0.05 per ADS held
Distribution of securities other than ADSs or rights to purchase additional ADSs	Up to US$0.05 per ADS held

In addition, an ADS holder shall be responsible for the following charges:

• taxes (including applicable interest and penalties) and other governmental charges;

• such registration fees as may from time to time be in effect for the registration of common shares or other deposited securities on the share register and applicable to transfers of common shares or other deposited securities to or from the name of the custodian, the depositary or any nominees upon the making of deposits and withdrawals, respectively;

• such cable, telex and facsimile transmission and delivery expenses as are expressly provided in the deposit agreement to be at the expense of ADS holders and beneficial owners of ADSs;

• the expenses and charges incurred by the depositary in the conversion of foreign currency;

75

• such fees and expenses as are incurred by the depositary in connection with compliance with exchange control regulations and other regulatory requirements applicable to common shares, deposited securities, ADSs and ADRs;

• the fees and expenses incurred by the depositary, the custodian or any nominee in connection with the servicing or delivery of deposited securities; and

• Depositary fees payable upon the issuance and cancellation of ADSs are typically paid to the depositary by the brokers (on behalf of their clients) receiving the newly-issued ADSs from the depositary and by the brokers (on behalf of their clients) delivering the ADSs to the depositary for cancellation. The brokers in turn charge these transaction fees to their clients.

Depositary fees payable in connection with distributions of cash or securities to ADS holders and the depositary services fee are charged by the depositary to the holders of record of ADSs as of the applicable ADS record date. The depositary fees payable for cash distributions are generally deducted from the cash being distributed. In the case of distributions other than cash (i.e., stock dividends, rights offerings), the depositary charges the applicable fee to the ADS record date holders concurrent with the distribution. In the case of ADSs registered in the name of the investor (whether certificated or un-certificated in direct registration), the depositary sends invoices to the applicable record date ADS holders. In the case of ADSs held in brokerage and custodian accounts via the central clearing and settlement system, The Depository Trust Company, or DTC, the depositary generally collects its fees through the systems provided by DTC (whose nominee is the registered holder of the ADSs held in DTC) from the brokers and custodians holding ADSs in their DTC accounts. The brokers and custodians who hold their clients’ ADSs in DTC accounts in turn charge their clients’ accounts the amount of the fees paid to the depositary.

In the event of refusal to pay the depositary fees, the depositary may, under the terms of the deposit agreement, refuse the requested service until payment is received or may set off the amount of the depositary fees from any distribution to be made to the ADS holder.

The fees and charges ADS holders may be required to pay may vary over time and may be changed by us and by the depositary. ADS holders will receive prior notice of such changes.

Depositary Payments

In 2021, pursuant to the terms of the deposit agreement, we received reimbursement of US$2.1 million from JPMorgan Chase & Co., the depositary for our ADR program through December 31, 2021. The reimbursement was to cover our expense related to ADR program, including:

• investor relations efforts

• NYSE listing fees, SEC filing fees and accounting supporting fees for FASB & PCAOB

• fees in connection with annual financial and Sarbanes-Oxley Act of 2002 audit

• other ADR program-related expenses

76

PART II.

ITEM 13 DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES

None.

ITEM 14 MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS

None.

ITEM 15 CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

For the period ended on December 31, 2021, an evaluation has been performed under the supervision and with the participation of our management, including our Co-presidents and our Chief Financial Officer, regarding the effectiveness of our disclosure controls and procedures, as such term is defined under Rules 13a-15(e) and 15d-15(e) promulgated under the Securities Exchange Act of 1934, as amended. Based on that evaluation, our Co-presidents and Chief Financial Officer have concluded that our disclosure controls and procedures were effective as of December 31, 2021.

Management’s Annual Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rule 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended, for our company. A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements in accordance with International Financial Reporting Standards as issued by International Accounting Standards Board.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

As required by Section 404 of the Sarbanes-Oxley Act of 2002 and related rules as promulgated by the Securities and Exchange Commission, our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2021 using the criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), or the COSO criteria, as amended regularly. Based on this assessment, our management concluded that our internal control over financial reporting was effective as of December 31, 2021 based on the COSO criteria. Our independent registered public accounting firm, Ernst & Young has issued an attestation report with unqualified opinion on the effectiveness of our internal control over financial reporting as of December 31, 2021, which is included immediately following this report.

77

Attestation Report of the Independent Registered Public Accounting Firm

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and the Board of Directors of United Microelectronics Corporation:

Opinion on Internal Control Over Financial Reporting

We have audited United Microelectronics Corporation and subsidiaries’ internal control over financial reporting as of December 31, 2021, based on criteria established in Internal Control— Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, United Microelectronics Corporation and subsidiaries (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2021, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2020 and 2021, the related consolidated statements of comprehensive income, changes in equity and cash flows for each of the three years in the period ended December 31, 2021, and the related notes (collectively referred to as the “consolidated financial statements”) and our report dated April 28, 2022 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

78

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Ernst & Young

Taipei, Taiwan

Republic of China

April 28, 2022

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ITEM 16A. AUDIT COMMITTEE FINANCIAL EXPERT

Our board of directors has determined that Wenyi Chu, Wen-Hsin Hsu and Kuang Si Shiu, three of our independent directors and members of the audit committee, qualify as audit committee financial experts as defined in Item 16A of Form 20-F and are independent in accordance with the applicable requirements of Rule 10A-3 of the Securities Exchange Act of 1934, as amended.

The SEC has indicated that the designation of Dr. Chu, Dr. Hsu and Mr. Shiu as the audit committee financial experts does not: (i) make Dr. Chu, Dr. Hsu or Mr. Shiu an “expert” for any purpose, including without limitation for purposes of Section 11 of the Securities Act as a result of this designation; (ii) impose any duties, obligations or liability on Dr. Chu, Dr. Hsu or Mr. Shiu that are greater than those imposed on them as a member of the audit committee and our board of directors in the absence of such designation; or (iii) affect the duties, obligations or liability of any other member of the audit committee or our board of directors.

ITEM 16B. CODE OF ETHICS

We amended the Code of Ethics for Directors and Officers in November 2017, and the Employee Code of Conduct in February 2020. The Employee Code of Conduct, which is applicable to all employees, replaced the code of ethics filed with the SEC in our 2003 annual report on Form 20-F. We have also created a separate code of ethics applicable to our directors and officers. A copy of each of the Code of Ethics for Directors and Officers and the Employee Code of Conduct are displayed on our website at http://www.umc.com/english/pdf/Code of Ethics.pdf and http://www.umc.com/english/pdf/Code of Conduct.pdf, respectively. Shareholders may request a hard copy of the Code of Ethics for Directors and Officers and the Employee Code of Conduct free of charge. Please contact the investor relations department of our company at ir@umc.com.

ITEM 16C. PRINCIPAL ACCOUNTANT FEES AND SERVICES

The following table sets forth the aggregate fees by categories specified below in connection with certain professional services rendered by Ernst & Young, our principal external auditors, for the years indicated.

	Years ended December 31,
	2020		2021
	NT$		NT$		US$
	(in thousands)
Audit Fees (1)		61,508		56,226		2,027
Audit-related Fees (2)		11,538		7,577		273
Tax Fees (3)		3,977		3,719		134
Total		77,023		67,522		2,434

(1) Audit fees consist of fees associated with the annual audit, review of our quarterly financial statements, statutory audits and internal control review. They also include fees billed for those services that are normally provided by the independent accountants in connection with statutory and regulatory filings.

(2) Audit-related fees consist of fees billed for assurance and services related to the performance of the audit or review of our financial statements but not described in footnote (1) above. These services include certification of our Singapore Branch to Singapore authorities and application for corporation registration.

(3) Tax fees include fees billed for professional services rendered by Ernst & Young, primarily in connection with our tax compliance activities.

All audit and non-audit services performed by Ernst & Young were pre-approved by our audit committee. In certain circumstances, the audit committee delegates to a designated member to pre-approve such audit and non-audit services. Pre-approval by a designated member should be reported to the audit committee at its upcoming meeting.

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ITEM 16D. EXEMPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES

None.

ITEM 16E. PURCHASE OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED PURCHASERS

We have from time to time announced plans, which were not binding on us, to buy back our common shares up to a certain amount on the Taiwan Stock Exchange. On May 11, 2016, we announced our 17th share buy-back plan after our board of directors resolved to purchase up to 200 million shares on the Taiwan Stock Exchange at a price between NT$7.90 and NT$18.70 per share during the period from May 12, 2016 to July 11, 2016. On March 7, 2018, we announced our 18th share buy-back plan after our board of directors resolved to purchase up to 200 million shares on the Taiwan Stock Exchange at a price between NT$9.85 and NT$21.30 per share during the period from March 8, 2018 to May 7, 2018. On November 5, 2018, we announced our 19th share buy-back plan after our board of directors resolved to purchase up to 300 million shares on the Taiwan Stock Exchange at a price between NT$7.55 and NT$20.80 per share during the period from November 6, 2018 to January 5, 2019. On April 24, 2019, we announced our 20th share buy-back plan since our board of directors resolved to purchase up to 200 million shares on the Taiwan Stock Exchange at a price between NT$8.40 and NT$18.10 per share during the period from April 25, 2019 to June 24, 2019. On June 5, 2020, we announced our 21st share buy-back plan after our board of directors resolved to purchase up to 200 million shares on the Taiwan Stock Exchange at a price between NT$11.55 and NT$23.25 per share during the period from June 8, 2020 to August 7, 2020.

The table below sets forth the repurchases we made in the periods indicated.

Month	Total Number of Common Shares Purchased		Average Price Paid per Common Share (NT$)		Total Number of Common Shares Purchased as Part of Publicly Announced Plans or Program		Maximum Number of Shares that May Yet be Purchased Under the Plans or Program
March 2018 (from March 8, 2018)		39,607,000		15.19		39,607,000		160,393,000
April 2018		117,923,000		15.58		157,530,000		42,470,000
May 2018 (till May 7, 2018)		42,470,000		16.26		200,000,000		—
November 2018 (from November 6, 2018)		141,000,000		11.01		141,000,000		159,000,000
December 2018		139,000,000		11.36		280,000,000		20,000,000
January 2019 (till January 5, 2019)		20,000,000		10.91		300,000,000		—
April 2019 (from April 26, 2018)		19,000,000		13.37		19,000,000		181,000,000
May 2019		126,000,000		13.10		145,000,000		55,000,000
June 2019 (till June 13, 2019)		55,000,000		13.39		200,000,000		—
June 2020 (from June 8, 2020)		76,000,000		15.80		76,000,000		124,000,000
July 2020 (till July 20, 2020)		29,000,000		16.47		105,000,000		95,000,000

ITEM 16F. CHANGE IN REGISTRANT’S CERTIFYING ACCOUNTANT

Not applicable.

ITEM 16G. CORPORATE GOVERNANCE

As a R.O.C. company listed on the New York Stock Exchange, or NYSE, we are subject to the U.S. corporate governance rules to the extent that these rules are applicable to foreign private issuers as defined under SEC rules. The following summary details the significant differences between our corporate governance practices and corporate governance standards for U.S. companies (i.e. non-foreign private issuers) under the NYSE listing standards.

The Legal Framework. In general, corporate governance principles for Taiwanese companies are set forth in the Company Act of the Republic of China, or the R.O.C. Company Act, the R.O.C. Securities Exchange Act and, to the extent they are listed on the Taiwan Stock Exchange, under listing rules of the Taiwan Stock Exchange. Corporate governance principles under provisions of R.O.C. law may differ in significant ways to corporate governance standards for U.S. companies listed on the NYSE. Committed to high standards of corporate governance, we have generally brought our corporate governance in line with U.S. regulations, including the formation and independence of an audit committee. However, we have not adopted certain recommended NYSE corporate governance standards where such standards are contrary to R.O.C. laws or regulations or generally prevailing business practices in Taiwan, as discussed in more detail below.

81

Independent Board Members. Under the NYSE listing standards applicable to U.S. companies, independent directors must comprise a majority of the board of directors. We currently have five independent directors out of a total of nine directors on our board of directors. Our standards for determining director independence substantially comply with the NYSE listing standards, which include detailed tests for determining director independence. In addition, even though our independent directors meet in committee meetings of which they are committee members, we do not hold executive sessions of non-management directors. Such requirement is contrary to the R.O.C. Company Act.

Board Committees. Under the NYSE listing standards, companies are required to have a nominating/corporate governance committee, composed entirely of independent directors. In addition to identifying individuals qualified to become board members, the nominating/corporate committee must develop and recommend to the board a set of corporate governance principles. Our nominating committee currently consists of five of our independent directors. The nominating committee is expected to assist our board to constitute a nomination policy and succession plans of the directors and the executives. We currently do not have a corporate governance committee, as such committee is not required under R.O.C. requirements. Our board of directors is responsible for regularly reviewing our corporate governance standards and practices.

Under the NYSE listing standards, companies are required to have a compensation committee, composed entirely of independent directors. Under the R.O.C. Company Act, however, companies incorporated in the R.O.C. are not required to have a compensation committee with the same standards as the NYSE listing standards, but publicly listed companies in the R.O.C. must have a remuneration committee in accordance with the applicable laws and rules in the R.O.C. We have established a remuneration committee composed of all the independent directors and convened meetings accordance with the applicable laws and rules in the R.O.C. The remuneration committee is responsible for determining the form and amount of compensation for each of our directors and executive officers under our articles of incorporation and the remuneration committee charter. In addition to the compensation approved at the annual general meeting, in the event we have net income in any fiscal year, we will distribute 0.1% of our earnings after payment of all income taxes, deduction of any past losses and allocation of 10% of our net income for legal reserves, as remuneration to our directors pursuant to our articles of incorporation.

Equity Compensation Plans. The NYSE listing standards also require that a company’s shareholders must approve equity compensation plans. Under the corresponding requirements in the R.O.C. Company Act and the R.O.C. Securities Exchange Act, shareholders’ approval is required for the distribution of employee bonuses in the form of stock, while the board of directors has authority, subject to the approval of the R.O.C. Securities and Futures Bureau, to approve employee stock option plans and to grant options to employees pursuant to such plans and also has authority to approve share buy-back programs for the purpose of selling common shares so purchased to employees and the sale of such common shares to employees pursuant to such programs. We intend to continue to follow only the R.O.C. requirements.

ITEM 16H. MINE SAFETY DISCLOSURE

Not applicable.

82

PART III.

ITEM 17 FINANCIAL STATEMENTS

Not applicable.

ITEM 18 FINANCIAL STATEMENTS

The following is a list of the audited consolidated financial statements and report of independent registered public accounting firm included in this Annual Report beginning on page F-1.

	Page
Consolidated Financial Statements of United Microelectronics Corporation and Subsidiaries		F-1
Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)		F-2
Consolidated Balance Sheets as of December 31, 2020 and 2021		F-4
Consolidated Statements of Comprehensive Income for the years ended December 31, 2019, 2020 and 2021		F-5
Consolidated Statements of Changes in Equity for the years ended December 31, 2019, 2020 and 2021		F-6
Consolidated Statements of Cash Flows for the years ended December 31, 2019, 2020 and 2021		F-9
Notes to the Consolidated Financial Statements		F-11

83

ITEM 19 EXHIBITS

Exhibit Number	Description of Exhibits
1.1	Articles of Incorporation of the Company as last amended on June 10, 2020(1)
2.1	Amended and Restated Deposit Agreement by and among the Company, JPMorgan Chase Bank, N.A., as depositary, and the Holders and Beneficial Owners of American Depositary Shares evidenced by American Depositary Receipts issued thereunder dated as of October 21, 2009(2)
2.2	Form of Amendment No. 1 to the Amended and Restated Deposit Agreement among the Company, JPMorgan Chase Bank, N.A., as depositary, and the Holders and Beneficial Owners of American Depositary Shares evidenced by American Depositary Receipts issued thereunder (3)
4.1	Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, Ko-Kuan Section, No. 20-22, Hsinchu, Taiwan, R.O.C., the site of Fab 6A (in Chinese with English summary translation)(4)(P)
4.2	Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of first phase, Hsinchu, Taiwan, R.O.C., the site of Fab 8A and United Tower (in Chinese with English summary translation)(5)(P)
4.3	Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of first phase, Hsinchu, Taiwan, R.O.C., the site of Fab 8C (in Chinese with English summary translation)(6)(P)
4.4	Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of first phase, Hsinchu, Taiwan, R.O.C., the site of Fab 8D (in Chinese with English summary translation)(7)(P)
4.5	Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of second phase, Hsinchu, Taiwan, R.O.C., the site of Fab 8E (in Chinese with English summary translation)(8)(P)
4.6	Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, Gin-Shan section, Hsinchu, Taiwan, R.O.C., the site of Fab 8F (in Chinese with English summary translation)(9)(P)
4.7	Lease Agreement with Southern Taiwan Science Park Administration in relation to government-owned land located at Tainan Science Park, Tainan, Taiwan, R.O.C., the site of Fab 12A (in Chinese with English summary translation)(10)(P)
4.8	Merger Agreement, entered into as of February 26, 2004, between United Microelectronics Corporation and SiS Microelectronics Corporation (English Translation)(11)

84

Exhibit Number	Description of Exhibits
4.9	Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, Ko-Kuan section, Hsinchu, Taiwan, R.O.C., the site of Fab 8S (in Chinese with English summary translation)(12)
4.10	Lease Agreement with JTC Corporation in relation to land located at Pasir Ris Wafer Fab Park, Singapore, the site of Fab12i (summary)(13)
4.11	Merger Agreement, entered into as of April 29, 2009, among United Microelectronics Corporation, Infoshine Technology Limited and Best Elite International Limited(14)
*8.1	List of Significant Subsidiaries of United Microelectronics Corporation
11.1	Code of Ethics for Directors and Officers(15)
11.2	Employee Code of Conduct(16)
*12.1	Certification of our Co-president pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
*12.2	Certification of our Co-president pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
*12.3	Certification of our Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
*13.1	Certification of our Co-president pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
*13.2	Certification of our Co-president pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
*13.3	Certification of our Chief Financial Officer pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
*101.INS	XBRL Instance Document
*101.SCH	XBRL Taxonomy Extension Schema Document
*101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
*101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
*101.LAB	XBRL Taxonomy Extension Label Linkbase Document
*101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

* Filed herewith.

(1) Incorporated by reference to Exhibit 1.1 to Registrant’s Annual Report on Form 20-F for the fiscal year ended December 31, 2013 (File No. 001-15128) filed with the Commission on April 18, 2014.

(2) Incorporated by reference to Exhibit (a) to the Registrant’s Registration Statement on Form F-6 (File No. 333- 162437) filed with the Commission on October 13, 2009.

(3) Incorporated by reference to Exhibit (a)(2) to the Registrant’s Registration Statement on Form F-6 (File No. 333- 172990) filed with the Commission on April 12, 2017.

(4) Incorporated by reference to Exhibit 4.1 to Registrant’s Annual Report on Form 20-F for the fiscal year ended December 31, 2006 (File No. 001-15128) filed with the Commission on May 9, 2007.

(5) Incorporated by reference to Exhibit 10.7 to the Registrant’s Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.

(6) Incorporated by reference to Exhibit 10.8 to the Registrant’s Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.

(7) Incorporated by reference to Exhibit 10.9 to the Registrant’s Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.

(8) Incorporated by reference to Exhibit 10.10 to the Registrant’s Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.

(9) Incorporated by reference to Exhibit 10.11 to the Registrant’s Registration Statement on F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.

(10) Incorporated by reference to Exhibit 10.12 to the Registrant’s Registration Statement on F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.

85

(11) Incorporated by reference to Exhibit 4.8 to the Registrant’s Annual Report on Form 20-F for the fiscal year ended December 31, 2003 (File No. 1-15128) filed with the Commission on June 17, 2004.

(12) Incorporated by reference to Exhibit 4.9 to Registrant’s Annual Report on Form 20-F for the fiscal year ended December 31, 2006 (File No. 001-15128) filed with the Commission on May 9, 2007.

(13) Incorporated by reference to Exhibit 4.10 to Registrant’s Annual Report on Form 20-F for the fiscal year ended December 31, 2006 (File No. 001-15128) filed with the Commission on May 9, 2007.

(14) Incorporated by reference to Exhibit 99.1 to the Form 6-K furnished to the Commission on May 8, 2009.

(15) Incorporated by reference to Exhibit 99.1 to the Form 6-K furnished to the Commission on March 25, 2005.

(16) Incorporated by reference to Exhibit 99.2 to the Form 6-K furnished to the Commission on May 26, 2006.

(17) Incorporated by reference to Item 12.D. in the Registrant’s Annual Report on Form 20-F for the fiscal year ended December 31, 2020 (File No. 001-15128) filed with the Commission on April 29, 2021.

(P) Paper exhibits

86

SIGNATURES

The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this Annual Report on its behalf.

UNITED MICROELECTRONICS CORPORATION
By:	/s/ CHITUNG LIU
	Name:	Chitung Liu
	Title:	Director, Chief Financial Officer and Senior Vice President

Date: April 28, 2022

87

United Microelectronics Corporation and Subsidiaries

Consolidated Financial Statements for years ended December 31, 2019, 2020 and 2021

Together with Report of Independent Registered Public Accounting Firm

F-1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and the Board of Directors of United Microelectronics Corporation

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of United Microelectronics Corporation and subsidiaries (the Company) as of December 31, 2020 and 2021, the related consolidated statements of comprehensive income, changes in equity and cash flows for each of the three years in the period ended December 31, 2021, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2020 and 2021, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2021, in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2021, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated April 28, 2022 expressed an unqualified opinion thereon.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

F-2

	Valuation for Slow-Moving Inventories
Description of the Matter	As of December 31, 2021, the Company’s net inventories amounted to NT$23,011 million. As the semiconductor industry is characterized by rapid changes in technology, management had to evaluate and estimate a reserve for slow-moving inventories that are expected to be written-off or otherwise disposed of at a future date. Auditing the valuation for slow-moving inventories was complex due to the judgmental nature of the Company’s estimation of the appropriate amount of the slow-moving inventories reserve, utilizing key inputs including historical usage, write-off activities and inventory aging.
How We Addressed the Matter in Our Audit	We obtained an understanding, evaluated the design and tested the operating effectiveness of internal controls over the Company’s slow-moving inventories reserve process. For example, we tested the control over management’s review of the reserve method and the key inputs used in the valuation process. To test the slow-moving inventories reserve, our audit procedures included, amongst others, evaluate the appropriateness of management’s methodology to determine inventory aging and inventory reserve percentages, compare slow-moving inventories reserve to historical usage and write-off activities and test the accuracy and completeness of the underlying data used in such determination. We also recalculated inventory reserve for the application of the reserve percentages to the inventory aging categories. In addition, we evaluated the adequacy of disclosures of inventories. Please refer to Notes 5 and 6 to the Company’s consolidated financial statements.

/s/ Ernst & Young

We have served as the Company’s auditor since 2000.

Taipei, Taiwan

Republic of China

April 28, 2022

F-3

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

As of December 31, 2020 and 2021

(Expressed in Thousands, Except for Par Value)

			As of December 31,
	Notes		2020			2021
			NT$			NT$			US$
Assets
Current assets
Cash and cash equivalents		4, 6(1)		94,048,036			132,622,131			4,780,899
Financial assets at fair value through profit or loss, current		4, 5, 6(2)		1,216,634			945,021			34,067
Financial assets at fair value through other comprehensive income, current		4, 5, 6(3)		—			8,482,334			305,780
Financial assets measured at amortized cost, current		4		—			20,000			721
Contract assets, current		4, 6(20)		257,841			319,621			11,522
Accounts receivable, net		4, 6(4)		27,094,355			34,624,109			1,248,165
Accounts receivable-related parties, net		4, 7		178,918			566,338			20,416
Other receivables		4		1,668,874			857,233			30,902
Current tax assets		4		37,598			2,597			94
Inventories, net		4, 5, 6(5)		22,552,486			23,011,183			829,531
Other current assets		6(7), 6(20)		17,251,169			31,822,866			1,147,183
Total current assets				164,305,911			233,273,433			8,409,280
Non-current assets
Financial assets at fair value through profit or loss, noncurrent		4, 5, 6(2), 7		14,826,087			19,501,274			703,002
Financial assets at fair value through other comprehensive income, noncurrent		4, 5, 6(3)		10,526,144			11,353,331			409,277
Investments accounted for under the equity method		4, 6(6), 7		20,330,138			28,138,378			1,014,361
Property, plant and equipment		4, 6(8), 8		132,774,663			129,941,703			4,684,272
Right-of-use assets		4, 6(9), 8		7,748,042			7,126,845			256,916
Intangible assets		4, 6(10), 7		4,877,913			3,644,933			131,396
Deferred tax assets		4, 5, 6(25)		6,665,976			5,478,269			197,486
Prepayment for equipment				586,333			8,322,874			300,032
Refundable deposits		8		2,310,961			2,358,549			85,023
Other noncurrent assets				1,501,933			1,815,752			65,456
Total non-current assets				202,148,190			217,681,908			7,847,221
Total assets				366,454,101			450,955,341			16,256,501
Liabilities and Equity
Current liabilities
Short-term loans		6(11), 6(27)		11,057,132			1,924,124			69,363
Financial liabilities at fair value through profit or loss, current		4, 6(12)		2,326			2,380,599			85,818
Contract liabilities, current		4, 6(20)		2,040,989			3,441,754			124,072
Notes and accounts payable				7,862,137			8,364,158			301,520
Other payables		6(19), 7		17,877,736			21,417,215			772,070
Payables on equipment				5,448,921			7,875,927			283,919
Current tax liabilities		4		2,288,582			7,049,691			254,134
Lease liabilities, current		4, 6(9), 6(27)		550,147			557,873			20,111
Other financial liabilities, current		4, 6(27), 9(6)		—			12,718,616			458,494
Current portion of long-term liabilities		4, 6(13), 6(14), 6(27)		26,985,078			37,331,970			1,345,781
Other current liabilities		4, 6(16), 6(17), 6(27), 7		5,368,095			5,187,451			187,003
Total current liabilities				79,481,143			108,249,378			3,902,285
Non-current liabilities
Contract liabilities, noncurrent		4, 6(20)		456,480			641,386			23,121
Bonds payable		4, 6(13), 6(27)		16,690,474			23,077,699			831,929
Long-term loans		6(14), 6(27)		8,080,938			16,751,896			603,889
Deferred tax liabilities		4, 5, 6(25)		1,965,108			2,323,917			83,775
Lease liabilities, noncurrent		4, 6(9), 6(27)		5,026,717			4,510,881			162,613
Net defined benefit liabilities, noncurrent		4, 6(15)		4,162,654			3,877,321			139,774
Guarantee deposits		6(27)		235,199			14,261,029			514,096
Other noncurrent liabilities		4, 6(16), 6(19), 6(27), 9(6)		27,215,826			12,886,787			464,556
Total non-current liabilities				63,833,396			78,330,916			2,823,753
Total liabilities				143,314,539			186,580,294			6,726,038
Commitments and contingencies		9
Equity attributable to the parent company
Capital		4, 6(18)
Common stock - NT$10 par value				124,224,015			124,832,476			4,500,089
Authorized: 26,000,000 thousand shares
Issued: 12,422,402 thousand shares as of December 31, 2020
Issued: 12,483,248 thousand shares as of December 31, 2021
Additional paid-in capital		4, 6(18), 6(19)
Premiums				36,809,962			39,889,798			1,437,988
Treasury stock transactions				4,663,538			6,790,108			244,777
Transactions with noncontrolling interests				479,236			478,696			17,257
Share-based payment				2,259,170			2,238,128			80,682
Other				241,081			683,866			24,653
Retained earnings		6(18)
Legal reserve				12,536,526			15,734,416			567,210
Special reserve				11,022,314			8,164,648			294,328
Unappropriated earnings				53,429,442			83,155,758			2,997,684
Other components of equity		4, 6(19)
Exchange differences on translation of foreign operations				(11,877,253	)		(16,612,724	)		(598,873	)
Unrealized gains or losses on financial assets measured at fair value through other comprehensive income				1,327,344			9,201,181			331,694
Unearned employee compensation				(3,667,395	)		(2,212,441	)		(79,756	)
Treasury stock		4, 6(18), 6(19)		(8,421,774	)		(8,192,044	)		(295,315	)
Total equity attributable to the parent company				223,026,206			264,151,866			9,522,418
Non-controlling interests		6(18)		113,356			223,181			8,045
Total equity				223,139,562			264,375,047			9,530,463
Total liabilities and equity				366,454,101			450,955,341			16,256,501

The accompanying notes are an integral part of the consolidated financial statements.

F-4

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

For the years ended December 31, 2019, 2020 and 2021

(Expressed in Thousands, Except for Earnings per Share)

			For the years ended December 31,
	Notes		2019			2020			2021
			NT$			NT$			NT$			US$
Operating revenues		4, 6(20), 7		148,201,641			176,820,914			213,011,018			7,678,840
Operating costs		4, 6(5), 6(10), 6(15), 6(19), 6(20), 6(21), 7		(126,886,669	)		(137,823,813	)		(140,961,389	)		(5,081,521	)
Gross profit				21,314,972			38,997,101			72,049,629			2,597,319
Operating expenses		4, 6(4), 6(10), 6(15), 6(19), 6(21), 7
Sales and marketing expenses				(3,807,610	)		(4,152,242	)		(4,671,599	)		(168,407	)
General and administrative expenses				(5,318,576	)		(6,664,166	)		(7,989,860	)		(288,027	)
Research and development expenses				(11,860,244	)		(12,895,501	)		(12,934,836	)		(466,288	)
Expected credit impairment (losses) gains				(627,159	)		392,145			6,121			221
Subtotal				(21,613,589	)		(23,319,764	)		(25,590,174	)		(922,501	)
Net other operating income and expenses		4, 6(8), 6(16), 6(22)		5,182,162			6,253,890			5,226,831			188,422
Operating income				4,883,545			21,931,227			51,686,286			1,863,240
Non-operating income and expenses
Interest income		4		994,061			737,913			575,719			20,754
Other income		4		711,614			698,155			1,653,006			59,589
Other gains and losses		4, 6(23), 6(29)		1,166,729			48,766			866,130			31,223
Finance costs		6(23)		(2,997,643	)		(2,073,433	)		(1,962,930	)		(70,762	)
Share of profit or loss of associates and joint ventures		4, 6(6)		115,329			1,300,263			5,193,495			187,221
Bargain purchase gain		4, 6(28)		171,585			—			—			—
Exchange gain, net		4		—			—			484,726			17,474
Exchange loss, net		4		(238,624	)		(100,141	)		—			—
Subtotal				(76,949	)		611,523			6,810,146			245,499
Income from continuing operations before income tax				4,806,596			22,542,750			58,496,432			2,108,739
Income tax expense		4, 5, 6(25)		(230,346	)		(1,691,083	)		(7,918,252	)		(285,445	)
Net income				4,576,250			20,851,667			50,578,180			1,823,294
Other comprehensive income (loss)		6(24)
Items that will not be reclassified subsequently to profit or loss
Remeasurements of defined benefit pension plans		4, 6(15)		106,403			(192,581	)		(197,477	)		(7,119	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income				5,486,209			4,815,361			5,811,342			209,493
Share of other comprehensive income of associates and joint ventures which will not be reclassified subsequently to profit or loss				899,025			883,508			2,959,130			106,674
Income tax related to items that will not be reclassified subsequently		4, 5, 6(25)		(457,619	)		(211,419	)		(417,076	)		(15,035	)
Subtotal				6,034,018			5,294,869			8,155,919			294,013
Items that may be reclassified subsequently to profit or loss
Exchange differences on translation of foreign operations				(3,277,938	)		(2,920,280	)		(4,741,016	)		(170,909	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss				15,393			60,317			(24,412	)		(880	)
Income tax related to items that may be reclassified subsequently		4, 5, 6(25)		6,106			45,913			29,938			1,079
Subtotal				(3,256,439	)		(2,814,050	)		(4,735,490	)		(170,710	)
Total other comprehensive income, net of tax				2,777,579			2,480,819			3,420,429			123,303
Total comprehensive income				7,353,829			23,332,486			53,998,609			1,946,597
Net income (loss) attributable to:
Shareholders of the parent				8,155,097			22,860,744			51,246,425			1,847,384
Non-controlling interests				(3,578,847	)		(2,009,077	)		(668,245	)		(24,090	)
				4,576,250			20,851,667			50,578,180			1,823,294
Total comprehensive income (loss) attributable to:
Shareholders of the parent				10,947,889			25,214,910			54,666,873			1,970,687
Non-controlling interests				(3,594,060	)		(1,882,424	)		(668,264	)		(24,090	)
				7,353,829			23,332,486			53,998,609			1,946,597
Earnings per share (NTD)		4, 6(26)
Earnings per share-basic				0.71			1.93			4.27			0.15
Earnings per share-diluted				0.65			1.87			4.19			0.15

The accompanying notes are an integral part of the consolidated financial statements.

F-5

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

For the year ended December 31, 2019

(Expressed in Thousands)

	Equity Attributable to the Parent Company
	Capital								Retained Earnings							Other Components of Equity
	Common Stock			Collected in Advance		Additional Paid-in Capital			Legal Reserve		Special Reserve		Unappropriated Earnings			Exchange Differences on Translation of Foreign Operations			Unrealized Gains or Losses on Financial Assets Measured at Fair Value through Other Comprehensive Income			Gains or Losses on Hedging Instruments			Treasury Stock			Total			Non-Controlling Interests			Total Equity
	NT$			NT$		NT$			NT$		NT$		NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
Balance as of January 1, 2019		124,243,187			—		41,302,035			10,865,280		—		55,416,447			(5,681,389	)		(8,379,834	)		(2,058	)		(13,832,953	)		203,930,715			466,768			204,397,483
Impact of retroactive applications		—			—		(10,427	)		—		—		—			(13,935	)		—			—			—			(24,362	)		—			(24,362	)
Adjusted balance as of January 1, 2019		124,243,187			—		41,291,608			10,865,280		—		55,416,447			(5,695,324	)		(8,379,834	)		(2,058	)		(13,832,953	)		203,906,353			466,768			204,373,121
Appropriation and distribution of 2018 retained earnings
Legal reserve		—			—		—			707,299		—		(707,299	)		—			—			—			—			—			—			—
Special reserve		—			—		—			—		14,513,940		(14,513,940	)		—			—			—			—			—			—			—
Cash dividends		—			—		—			—		—		(6,916,105	)		—			—			—			—			(6,916,105	)		—			(6,916,105	)
Net income (loss) for the year ended December 31, 2019		—			—		—			—		—		8,155,097			—			—			—			—			8,155,097			(3,578,847	)		4,576,250
Other comprehensive income (loss), net of tax for the year ended December 31, 2019		—			—		—			—		—		84,744			(3,241,226	)		5,949,274			—			—			2,792,792			(15,213	)		2,777,579
Total comprehensive income (loss)		—			—		—			—		—		8,239,841			(3,241,226	)		5,949,274			—			—			10,947,889			(3,594,060	)		7,353,829
Share-based payment transaction		—			—		377,004			—		—		—			—			—			—			—			377,004			—			377,004
Conversion of convertible bonds		—			332,611		130,804			—		—		—			—			—			—			—			463,415			—			463,415
Treasury stock acquired		—			—		—			—		—		—			—			—			—			(2,859,498	)		(2,859,498	)		—			(2,859,498	)
Treasury stock cancelled		(7,000,000	)		—		(1,387,127	)		—		—		—			—			—			—			8,387,127			—			—			—
Share of changes in net assets of associates and joint ventures accounted for using equity method		—			—		14,123			—		—		387,654			—			(387,654	)		—			—			14,123			—			14,123
Changes in subsidiaries’ ownership		—			—		1,179			—		—		(22,280	)		—			—			—			—			(21,101	)		24,740			3,639
Adjustments due to reciprocal stockholdings held by subsidiaries and associates		—			—		140,909			—		—		—			—			—			—			(108,668	)		32,241			—			32,241
Disposal of equity instruments investments measured at fair value through other comprehensive income		—			—		—			—		—		(551,903	)		—			551,903			—			—			—			—			—
Others		—			—		15,458			—		—		(3,457,987	)		—			—			2,058			—			(3,440,471	)		3,512,617			72,146
Balance as of December 31, 2019		117,243,187			332,611		40,583,958			11,572,579		14,513,940		37,874,428			(8,936,550	)		(2,266,311	)		—			(8,413,992	)		202,503,850			410,065			202,913,915

The accompanying notes are an integral part of the consolidated financial statements.

F-6

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

For the year ended December 31, 2020

(Expressed in Thousands)

	Equity Attributable to the Parent Company
	Capital								Retained Earnings								Other Components of Equity
	Common Stock		Collected in Advance			Additional Paid-in Capital			Legal Reserve		Special Reserve			Unappropriated Earnings			Exchange Differences on Translation of Foreign Operations			Unrealized Gains or Losses on Financial Assets Measured at Fair Value through Other Comprehensive Income			Unearned Employee Compensation			Treasury Stock			Total			Non-Controlling Interests			Total Equity
	NT$		NT$			NT$			NT$		NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
Balance as of January 1, 2020		117,243,187		332,611			40,583,958			11,572,579		14,513,940			37,874,428			(8,936,550	)		(2,266,311	)		—			(8,413,992	)		202,503,850			410,065			202,913,915
Appropriation and distribution of 2019 retained earnings
Legal reserve		—		—			—			963,947		—			(963,947	)		—			—			—			—			—			—			—
Cash dividends		—		—			—			—		—			(9,765,155	)		—			—			—			—			(9,765,155	)		—			(9,765,155	)
Special reserve reversed		—		—			—			—		(3,491,626	)		3,491,626			—			—			—			—			—			—			—
Net income (loss) for the year ended December 31, 2020		—		—			—			—		—			22,860,744			—			—			—			—			22,860,744			(2,009,077	)		20,851,667
Other comprehensive income (loss), net of tax for the year ended December 31, 2020		—		—			—			—		—			(157,529	)		(2,940,703	)		5,452,398			—			—			2,354,166			126,653			2,480,819
Total comprehensive income (loss)		—		—			—			—		—			22,703,215			(2,940,703	)		5,452,398			—			—			25,214,910			(1,882,424	)		23,332,486
Share-based payment transaction		2,000,300		—			2,628,061			—		—			—			—			—			(3,667,395	)		1,678,272			2,639,238			—			2,639,238
Conversion of convertible bonds		4,980,528		(332,611	)		1,862,366			—		—			—			—			—			—			—			6,510,283			—			6,510,283
Treasury stock acquired		—		—			—			—		—			—			—			—			—			(1,678,272	)		(1,678,272	)		—			(1,678,272	)
Share of changes in net assets of associates and joint ventures accounted for using equity method		—		—			(294	)		—		—			33,378			—			(33,378	)		—			—			(294	)		—			(294	)
Disposal of subsidiaries		—		—			—			—		—			—			—			—			—			—			—			(51,565	)		(51,565	)
The differences between the fair value of the consideration paid or received from acquiring or disposing subsidiaries and the carrying amounts of the subsidiaries		—		—			(106,879	)		—		—			—			—			—			—			—			(106,879	)		106,879			—
Changes in subsidiaries’ ownership		—		—			(1,218	)		—		—			(816,632	)		—			—			—			—			(817,850	)		(10,331	)		(828,181	)
Adjustments due to reciprocal stockholdings held by subsidiaries and associates		—		—			192,042			—		—			—			—			—			—			(7,782	)		184,260			—			184,260
Disposal of equity instruments investments measured at fair value through other comprehensive income		—		—			—			—		—			1,825,365			—			(1,825,365	)		—			—			—			—			—
Non-Controlling Interests		—		—			—			—		—			—			—			—			—			—			—			(551,608	)		(551,608	)
Others		—		—			(705,049	)		—		—			(952,836	)		—			—			—			—			(1,657,885	)		2,092,340			434,455
Balance as of December 31, 2020		124,224,015		—			44,452,987			12,536,526		11,022,314			53,429,442			(11,877,253	)		1,327,344			(3,667,395	)		(8,421,774	)		223,026,206			113,356			223,139,562

The accompanying notes are an integral part of the consolidated financial statements.

F-7

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

For the year ended December 31, 2021

(Expressed in Thousands)

	Equity Attributable to the Parent Company
	Capital						Retained Earnings								Other Components of Equity
	Common Stock			Additional Paid-in Capital			Legal Reserve		Special Reserve			Unappropriated Earnings			Exchange Differences on Translation of Foreign Operations			Unrealized Gains or Losses on Financial Assets Measured at Fair Value through Other Comprehensive Income			Unearned Employee Compensation			Treasury Stock			Total			Non-Controlling Interests			Total Equity
	NT$			NT$			NT$		NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
Balance as of January 1, 2021		124,224,015			44,452,987			12,536,526		11,022,314			53,429,442			(11,877,253	)		1,327,344			(3,667,395	)		(8,421,774	)		223,026,206			113,356			223,139,562
Appropriation and distribution of 2020 retained earnings
Legal reserve		—			—			3,197,890		—			(3,197,890	)		—			—			—			—			—			—			—
Cash dividends		—			—			—		—			(19,875,842	)		—			—			—			—			(19,875,842	)		—			(19,875,842	)
Special reserve reversed		—			—			—		(2,857,666	)		2,857,666			—			—			—			—			—			—			—
Net income (loss) for the year ended December 31, 2021		—			—			—		—			51,246,425			—			—			—			—			51,246,425			(668,245	)		50,578,180
Other comprehensive income (loss), net of tax for the year ended December 31, 2021		—			—			—		—			(148,768	)		(4,735,471	)		8,304,687			—			—			3,420,448			(19	)		3,420,429
Total comprehensive income (loss)		—			—			—		—			51,097,657			(4,735,471	)		8,304,687			—			—			54,666,873			(668,264	)		53,998,609
Share-based payment transaction		(2,617	)		293,374			—		—			—			—			—			1,454,954			—			1,745,711			—			1,745,711
Share of changes in net assets of associates and joint ventures accounted for using equity method		—			(540	)		—		—			430,850			—			(430,850	)		—			—			(540	)		—			(540	)
Changes in subsidiaries’ ownership		—			—			—		—			(1,009,440	)		—			—			—			—			(1,009,440	)		(11,126	)		(1,020,566	)
Adjustments due to reciprocal stockholdings held by subsidiaries and associates		—			961,003			—		—			—			—			—			—			109,929			1,070,932			—			1,070,932
Non-Controlling Interests		—			—			—		—			—			—			—			—			—			—			23,430			23,430
Share exchange		611,078			3,930,986			—		—			—			—			—			—			119,801			4,661,865			—			4,661,865
Others		—			442,786			—		—			(576,685	)		—			—			—			—			(133,899	)		765,785			631,886
Balance as of December 31, 2021		124,832,476			50,080,596			15,734,416		8,164,648			83,155,758			(16,612,724	)		9,201,181			(2,212,441	)		(8,192,044	)		264,151,866			223,181			264,375,047

The accompanying notes are an integral part of the consolidated financial statements.

F-8

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

For the years ended December 31, 2019, 2020 and 2021

(Expressed in Thousands)

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$			US$
Cash flows from operating activities:
Net income before tax		4,806,596			22,542,750			58,496,432			2,108,739
Adjustments to reconcile net income before tax to net cash provided by operating activities:
Depreciation		47,172,881			46,163,693			44,179,632			1,592,633
Amortization		2,216,654			2,744,383			2,894,942			104,360
Expected credit impairment losses (gains)		627,159			(392,145	)		(6,121	)		(221	)
Net gain of financial assets and liabilities at fair value through profit or loss		(1,279,931	)		(2,011,403	)		(2,892,470	)		(104,271	)
Interest expense		2,933,815			2,004,418			1,868,089			67,343
Interest income		(994,061	)		(737,913	)		(575,719	)		(20,754	)
Dividend income		(711,614	)		(698,155	)		(1,653,006	)		(59,589	)
Share-based payment		366,186			959,219			1,745,745			62,932
Share of profit of associates and joint ventures		(115,329	)		(1,300,263	)		(5,193,495	)		(187,221	)
Gain on disposal of property, plant and equipment		(43,036	)		(1,137,320	)		(143,735	)		(5,182	)
Loss on disposal of investments		16,293			91,070			16,388			591
Impairment loss on non-financial assets		118,134			—			—			—
Exchange loss (gain) on financial assets and liabilities		206,612			(1,386,657	)		(505,434	)		(18,220	)
Bargain purchase gain		(171,585	)		—			—			—
Loss (gain) on lease modification		—			(1,765	)		6			—
Amortization of deferred government grants		(4,062,148	)		(3,994,818	)		(4,069,055	)		(146,685	)
Others		—			—			243,447			8,776
Income and expense adjustments		46,280,030			40,302,344			35,909,214			1,294,492
Changes in operating assets and liabilities:
Financial assets and liabilities at fair value through profit or loss		(594,847	)		876,876			119,904			4,323
Contract assets		(126,340	)		(49,108	)		(81,887	)		(2,952	)
Notes receivable and accounts receivable		439,400			(1,501,100	)		(8,590,622	)		(309,683	)
Other receivables		67,347			(224,488	)		134,111			4,835
Inventories		(1,370,249	)		(1,014,039	)		(871,589	)		(31,420	)
Other current assets		5,769,041			2,981,984			(227,852	)		(8,214	)
Contract fulfillment costs		8,054			4,200			(71,828	)		(2,589	)
Contract liabilities		69,329			1,072,225			1,637,105			59,016
Notes and accounts payable		(739,066	)		(944,909	)		688,652			24,825
Other payables		511,244			2,247,473			4,092,040			147,514
Other current liabilities		796,243			(593,710	)		(506,837	)		(18,271	)
Net defined benefit liabilities		(35,398	)		(55,300	)		(482,809	)		(17,405	)
Other noncurrent liabilities		(3,240	)		53,743			71,430			2,575
Cash generated from operations		55,878,144			65,698,941			90,315,464			3,255,785
Interest received		973,241			758,235			505,379			18,218
Dividend received		818,691			1,041,972			3,006,829			108,393
Interest paid		(2,147,320	)		(1,735,327	)		(1,539,069	)		(55,482	)
Income tax paid		(618,608	)		(18,629	)		(1,936,712	)		(69,816	)
Net cash provided by operating activities		54,904,148			65,745,192			90,351,891			3,257,098
Cash flows from investing activities:
Acquisition of financial assets at fair value through profit or loss		(354,249	)		(1,118,572	)		(921,916	)		(33,234	)
Proceeds from disposal of financial assets at fair value through profit or loss		229,553			326,127			439,145			15,831
Proceeds from disposal of financial assets at fair value through other comprehensive income or loss		44,466			—			—			—
Acquisition of financial assets measured at amortised cost		—			—			(20,000	)		(721	)
Acquisition of investments accounted for under the equity method		(730,000	)		(59,900	)		—			—
Proceeds from disposal of investments accounted for under the equity method		5,970			30,611			—			—
Increase in prepayment for investments		(17,974	)		—			(5,025	)		(181	)
Proceeds from capital reduction and liquidation of investments		32,214			27,200			42,150			1,519
Acquisition of subsidiary (net of cash acquired)		(12,800,981	)		—			—			—
Disposal of subsidiary		32,017			(785,772	)		714,358			25,752
Acquisition of property, plant and equipment		(16,518,483	)		(26,345,302	)		(48,034,633	)		(1,731,602	)
Proceeds from disposal of property, plant and equipment		45,042			1,737,125			216,314			7,798
Increase in refundable deposits		(257,909	)		(160,254	)		(274,015	)		(9,878	)
Decrease in refundable deposits		441,013			448,893			220,750			7,958
Acquisition of intangible assets		(2,443,593	)		(2,009,031	)		(1,924,924	)		(69,392	)
Government grants related to assets acquisition		617,685			242,264			2,498,984			90,086
Increase in other financial assets		—			(18,422,183	)		(37,121,310	)		(1,338,187	)
Decrease in other financial assets		—			5,984,342			22,132,639			797,860
Increase in other noncurrent assets		(15,074	)		(7,049	)		(125,917	)		(4,539	)
Decrease in other noncurrent assets		8,786			—			—			—
Net cash used in investing activities		(31,681,517	)		(40,111,501	)		(62,163,400	)		(2,240,930	)

The accompanying notes are an integral part of the consolidated financial statements.

F-9

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

For the years ended December 31, 2019, 2020 and 2021

(Expressed in Thousands)

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$			US$
Cash flows from financing activities:
Increase in short-term loans		25,732,933			16,271,732			7,205,015			259,734
Decrease in short-term loans		(26,726,656	)		(17,205,124	)		(16,179,231	)		(583,245	)
Cash payments for the principal portion of the lease liability		(633,488	)		(726,626	)		(699,680	)		(25,223	)
Proceeds from bonds issued		—			—			25,760,800			928,652
Bonds issuance costs		—			—			(57,108	)		(2,059	)
Redemption of bonds		(2,500,000	)		(13,702,875	)		(2,000,000	)		(72,098	)
Proceeds from long-term loans		11,449,930			13,528,900			15,560,661			560,947
Repayments of long-term loans		(7,572,939	)		(13,391,980	)		(11,472,124	)		(413,559	)
Increase in guarantee deposits		269,415			303,720			14,812,963			533,993
Decrease in guarantee deposits		(17,146	)		(363,539	)		(593,555	)		(21,397	)
Cash dividends		(6,911,058	)		(9,765,694	)		(19,871,129	)		(716,335	)
Treasury stock acquired		(2,972,243	)		(1,678,272	)		—			—
Treasury stock sold to employees		—			1,677,900			—			—
Change in non-controlling interests		3,388			(551,608	)		23,430			845
Others		10,818			2,120			65			2
Net cash provided by (used in) financing activities		(9,867,046	)		(25,601,346	)		12,490,107			450,257
Effect of exchange rate changes on cash and cash equivalents		(1,524,847	)		(1,476,786	)		(2,104,503	)		(75,866	)
Net increase (decrease) in cash and cash equivalents		11,830,738			(1,444,441	)		38,574,095			1,390,559
Cash and cash equivalents at beginning of year		83,661,739			95,492,477			94,048,036			3,390,340
Cash and cash equivalents at end of year		95,492,477			94,048,036			132,622,131			4,780,899

The accompanying notes are an integral part of the consolidated financial statements.

F-10

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in Thousands of New Taiwan Dollars unless Otherwise Specified)

1. HISTORY AND ORGANIZATION

United Microelectronics Corporation (UMC) was incorporated in Republic of China (R.O.C.) in May 1980 and commenced operations in April 1982. UMC is a full service semiconductor wafer foundry, and provides a variety of services to satisfy customer needs. UMC’s ordinary shares were publicly listed on the Taiwan Stock Exchange (TWSE) in July 1985 and its American Depositary Shares (ADSs) were listed on the New York Stock Exchange (NYSE) in September 2000.

The address of its registered office and principal place of business is No. 3, Li-Hsin Road II, Hsinchu Science Park, Hsinchu City, Taiwan. The principal operating activities of UMC and its subsidiaries (collectively as “the Company”) are described in Notes 4(3) and 12.

2. DATE AND PROCEDURES OF AUTHORIZATION OF FINANCIAL STATEMENTS FOR ISSUE

The consolidated financial statements of the Company were approved and authorized for issue by the audit committee of the Board of Directors on April 27, 2022.

3. NEW ACCOUNTING PRONOUNCEMENT UNDER INTERNATIONAL FINANCIAL REPORTING STANDARDS (IFRSs)

(1) The Company applied International Financial Reporting Standards, International Accounting Standards, and Interpretations issued, revised or amended which have been issued by the International Accounting Standards Board (IASB) and become effective for annual periods beginning on or after January 1, 2021. There were no newly adopted or revised standards and interpretations that have material impact on the Company’s financial position and performance.

F-11

(2) The Company has not adopted the following new, revised or amended IFRSs that have been issued by the IASB but not yet effective:

New, Revised or Amended Standards and Interpretations	Effective Date issued by IASB
Narrow-scope amendments of IFRS, including Amendments to IFRS 3, Amendments to IAS 16, Amendments to IAS 37	January 1, 2022
Annual Improvements to IFRS Standards 2018 - 2020:	January 1, 2022
Amendments to IFRS 1 “First-time Adoption of International Financial Reporting Standards”
Amendments to IFRS 9 “Financial Instruments”
Amendments to IFRS 16 “Leases”
IFRS 10 “Consolidated Financial Statements” and IAS 28 “Investments in Associates and Joint Ventures” – Sale or Contribution of Assets between an Investor and its Associate or Joint Venture	To be determined by IASB
IFRS 17 “Insurance Contracts”	January 1, 2023
Amendments to IAS 1 “Presentation of Financial Statements” – Classification of Liabilities as Current or Non-current	January 1, 2023
Amendments to IAS 1 “Presentation of Financial Statements” - Disclosure Initiative - Accounting Policies	January 1, 2023
Amendments to IAS 8 “Accounting Policies, Changes in Accounting Estimates and Errors” - Definition of Accounting Estimates	January 1, 2023
Amendment to IAS 12 “Income Taxes” - Deferred Tax related to Assets and Liabilities arising from a Single Transaction	January 1, 2023

(3) The potential effects of adopting the standards or interpretations issued by IASB on the Company’s financial statements in future periods are summarized as below:

a. Narrow-scope amendments of IFRS, including Amendments to IFRS 3, Amendments to IAS 16, Amendments to IAS 37

i. Updating a Reference to the Conceptual Framework (Amendments to IFRS 3)

The amendments updated IFRS 3 by replacing a reference to an old version of the Conceptual Framework for Financial Reporting with a reference to the latest version, which was issued in March 2018. The amendments also added an exception to the recognition principle of IFRS 3 to avoid the issue of potential “day 2” gains or losses arising for liabilities and contingent liabilities. Besides, the amendments clarify existing guidance in IFRS 3 for contingent assets that would not be affected by replacing the reference to the Conceptual Framework.

F-12

ii. Property, Plant and Equipment: Proceeds before Intended Use (Amendments to IAS 16)

The amendments prohibit a company from deducting from the cost of property, plant and equipment amounts received from selling items produced while the company is preparing the asset for its intended use. Instead, a company will recognise such sales proceeds and related cost in profit or loss.

iii. Onerous Contracts - Cost of Fulfilling a Contract (Amendments to IAS 37)

The amendments clarify what costs a company should include as the cost of fulfilling a contract when assessing whether a contract is onerous.

b. Annual Improvements to IFRS Standards 2018 – 2020

i. Amendment to IFRS 1 First-time Adoption of International Financial Reporting Standards

The amendment simplifies the application of IFRS 1 by a subsidiary that becomes a first-time adopter after its parent in relation to the measurement of cumulative translation differences.

ii. Amendment to IFRS 9 Financial Instruments (IFRS 9)

The amendment clarifies the fees a company includes when assessing whether the terms of a new or modified financial liability are substantially different from the terms of the original financial liability.

iii. Amendment to Illustrative Examples Accompanying IFRS 16 Leases

The amendment to Illustrative Example 13 accompanying IFRS 16 modifies the treatment of lease incentives relating to lessee’s leasehold improvements.

c. IFRS 10 “Consolidated Financial Statements” (IFRS 10) and IAS 28 “Investments in Associates and Joint Ventures” (IAS 28) - Sale or Contribution of Assets between an Investor and its Associate or Joint Venture (Amendment)

The amendments address the inconsistency between the requirements in IFRS 10 and IAS 28, in dealing with the loss of control of a subsidiary that is contributed to an associate or a joint venture. IAS 28 restricts gains and losses arising from contributions of non-monetary assets to an associate or a joint venture to the extent of the interest attributable to the other equity holders in the associate or joint venture. IFRS 10 requires full profit or loss recognition on the loss of control of a subsidiary. IAS 28 was amended so that the gain or loss resulting from the sale or contribution of assets that constitute a business as defined in IFRS 3 “Business Combinations” (IFRS 3) between an investor and its associate or joint venture is recognized in full.

IFRS 10 was also amended so that the gain or loss resulting from the sale or contribution of a subsidiary that does not constitute a business as defined in IFRS 3 between an investor and its associate or joint venture is recognized only to the extent of the unrelated investors’ interests in the associate or joint venture. The effective date of this amendment has been deferred indefinitely, but early adoption is allowed.

F-13

d. IFRS 17 “Insurance Contracts” (IFRS 17)

IFRS 17 provides a comprehensive model for insurance contracts, covering all relevant accounting aspects (including recognition, measurement, presentation and disclosure requirements). The core of IFRS 17 is the General (building block) Model, under this model, on initial recognition, an entity shall measure a group of insurance contracts at the total of the fulfilment cash flows and the contractual service margin. The carrying amount of a group of insurance contracts at the end of each reporting period shall be the sum of the liability for remaining coverage and the liability for incurred claims.

Other than the General Model, the standard also provides a specific adaptation for contracts with direct participation features (the Variable Fee Approach) and a simplified approach (Premium Allocation Approach) mainly for short-duration contracts.

IFRS 17 was issued in May 2017 and it was amended in June 2020 and December 2021. The amendments include deferral of the date of initial application of IFRS 17 by two years to annual beginning on or after 1 January 2023 (from the original effective date of 1 January 2021); provide additional transition reliefs; simplify some requirements to reduce the costs of applying IFRS 17 and revise some requirements to make the results easier to explain. IFRS 17 replaces an interim Standard – IFRS 4 Insurance Contracts – from annual reporting periods beginning on or after 1 January 2023.

e. IAS 1 “Presentation of Financial Statements” (IAS 1)—Classification of Liabilities as Current or Non-current (Amendment)

These are the amendments to paragraphs 69-76 of IAS 1 presentation of financial statements and the amended paragraphs related to the classification of liabilities as current or non-current.

F-14

f. IAS 1 “Presentation of Financial Statements” (IAS 1)—Disclosure Initiative—Accounting Policies (Amendment)

The amendments improve accounting policy disclosures that to provide more useful information to investors and other primary users of the financial statements.

g. IAS 8 “Accounting Policies, Changes in Accounting Estimates and Errors” (IAS 8) -Definition of Accounting Estimates (Amendment)

The amendments introduce the definition of accounting estimates and included other amendments to IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors to help companies distinguish changes in accounting estimates from changes in accounting policies.

h. IAS 12 “Income Taxes” (IAS 12)—Deferred Tax related to Assets and Liabilities arising from a Single Transaction (Amendment)

The amendments narrow the scope of the recognition exemption in paragraphs 15 and 24 of IAS 12 so that it no longer applies to transactions that, on initial recognition, give rise to equal taxable and deductible temporary differences.

F-15

The Company is currently evaluating the potential impact of the aforementioned standards and interpretations listed (d) - (h) to the Company’s financial position and performance, and the related impact will be disclosed when the evaluation is completed. The rest of the standards listed are not expected to have material impact on the Company’s financial position and performance, except for the following:

The Company expect to apply the amended IAS 37 to contracts which it has not yet fulfilled all its obligation at the beginning of the annual reporting period since 2022 (the date of initial application). The adoption of the amendments has no material impact on the Company. The cumulative effect of initially applying the amendments will be recognized as adjustments to the provisions (classified under other current liabilities), retained earnings and non-controlling interests, respectively at the date of initial application.

4. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

(1) Statement of Compliance

The Company’s consolidated financial statements were prepared in accordance with IFRSs, including International Financial Reporting Standards, International Accounting Standards, IFRIC Interpretations and SIC Interpretations, as issued by IASB.

(2) Basis of Preparation

The consolidated financial statements have been prepared on a historical cost basis, except for financial instruments measured at fair value.

(3) General Description of Reporting Entity

a. Principles of consolidation

Subsidiaries are fully consolidated from the date of acquisition (the date on which the Company obtains control), and continue to be consolidated until the date that such control ceases. The Company controls an entity when the Company is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of the subsidiaries are prepared for the same reporting period as the parent company, using consistent accounting policies. All intra-group balances, transactions, unrealized gains and losses and dividends resulting from intra-group transactions are eliminated in full.

A change in the ownership interest of a subsidiary, without a change of control, is accounted for as an equity transaction. Total comprehensive income of subsidiaries is attributed to the shareholders of the parent and to the non-controlling interests even if this results in the non-controlling interests having a deficit balance.

F-16

If the Company loses control over a subsidiary, the Company derecognizes the assets and liabilities of the subsidiary, as well as any non-controlling interests previously recorded by the Company. A gain or loss is recognized in profit or loss and is calculated as the difference between: (a) the aggregate of the fair value of consideration received and the fair value of any retained interest at the date when control is lost; and (b) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling interests. Any gain or loss previously recognized in the other comprehensive income would be reclassified to profit or loss or transferred directly to retained earnings if required by other IFRSs. The fair value of any investment retained in the former subsidiary at the date when control is lost is regarded as the cost on initial recognition of an investment.

b. The consolidated entities as of December 31, 2020 and 2021 were as follows:

			Percentage of ownership (%) as of December 31,
Investor	Subsidiary	Business nature	2020		2021
UMC	UMC GROUP (USA)	IC Sales		100.00		100.00
UMC	UNITED MICROELECTRONICS (EUROPE) B.V.	Marketing support activities		100.00		100.00
UMC	UMC CAPITAL CORP.	Investment holding		100.00		100.00
UMC	GREEN EARTH LIMITED (GE)	Investment holding		100.00		100.00
UMC	TLC CAPITAL CO., LTD. (TLC)	Venture capital		100.00		100.00
UMC	UMC INVESTMENT (SAMOA) LIMITED	Investment holding		100.00		100.00
UMC	FORTUNE VENTURE CAPITAL CORP. (FORTUNE)	Consulting and planning for venture capital		100.00		100.00
UMC	UMC KOREA CO., LTD.	Marketing support activities		100.00		100.00
UMC	OMNI GLOBAL LIMITED (OMNI)	Investment holding		100.00		100.00
UMC	SINO PARAGON LIMITED	Investment holding		100.00		100.00
UMC	BEST ELITE INTERNATIONAL LIMITED (BE)	Investment holding		100.00		100.00
UMC	UNITED SEMICONDUCTOR JAPAN CO., LTD.	Sales and manufacturing of integrated circuits		100.00		100.00
UMC and FORTUNE	WAVETEK MICROELECTRONICS CORPORATION (WAVETEK)	Sales and manufacturing of integrated circuits		81.40		80.37
TLC	SOARING CAPITAL CORP.	Investment holding		100.00		100.00

F-17

			Percentage of ownership (%) as of December 31,
Investor	Subsidiary	Business nature	2020		2021
SOARING CAPITAL CORP.	UNITRUTH ADVISOR (SHANGHAI) CO., LTD.	Investment holding and advisory		100.00		100.00
GE	UNITED MICROCHIP CORPORATION	Investment holding		100.00		100.00
FORTUNE	TERA ENERGY DEVELOPMENT CO., LTD. (TERA ENERGY)	Energy technical services		100.00		100.00
TERA ENERGY	EVERRICH ENERGY INVESTMENT (HK) LIMITED (EVERRICH-HK)	Investment holding		100.00		100.00
EVERRICH-HK	EVERRICH (SHANDONG) ENERGY CO., LTD.	Solar engineering integrated design services		100.00		100.00
OMNI	UNITED MICROTECHNOLOGY CORPORATION (CALIFORNIA)	Research and development		100.00		100.00
OMNI	ECP VITA PTE. LTD.	Insurance		100.00		100.00
OMNI	UMC TECHNOLOGY JAPAN CO., LTD.	Semiconductor manufacturing technology development and consulting services		100.00		—
WAVETEK	WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA)	Investment holding		100.00		100.00
WAVETEK-SAMOA	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		100.00		100.00
BE	INFOSHINE TECHNOLOGY LIMITED (INFOSHINE)	Investment holding		100.00		100.00
INFOSHINE	OAKWOOD ASSOCIATES LIMITED (OAKWOOD)	Investment holding		100.00		100.00
OAKWOOD	HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ)	Sales and manufacturing of integrated circuits		99.9985		99.9985
HJ	UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS)	Integrated circuits design services		100.00		100.00
UNITED MICROCHIP CORPORATION and HJ	UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM)	Sales and manufacturing of integrated circuits		67.76		69.95

F-18

(4) Business Combinations and Goodwill

Business combinations are accounted for using the acquisition method. The consideration transferred, the identifiable assets acquired and liabilities assumed are measured at the acquisition date fair value. For the components of non-controlling interests in the acquiree that are present ownership interests and entitle their holders to a proportionate share of the entity’s net assets in the event of liquidation, the acquirer measures at either fair value or at the non-controlling interest’s proportionate share of the acquiree’s identifiable net assets. Acquisition-related costs are expensed as incurred and are classified under administrative expenses.

When the Company acquires a business, it assesses the assets acquired and liabilities assumed for appropriate classification and designation in accordance with the contractual terms, economic circumstances and pertinent conditions as at the acquisition date.

If the business combination is achieved in stages, the acquisition date fair value of the acquirer’s previously held equity interest in the acquiree is remeasured at fair value as at the acquisition date through profit or loss.

Any contingent consideration to be transferred by the acquirer will be recognized at fair value at the acquisition date. Subsequent changes to the fair value of the contingent consideration which is deemed to be an asset or liability, will be recognized in accordance with IFRS 9, either in profit or loss or other comprehensive income. If the contingent consideration is classified as equity, it should not be remeasured until it is finally settled within equity.

Goodwill is initially measured at cost, being the excess of the aggregate of the consideration transferred, the acquisition date fair value of the acquirer’s previously held equity interest in the acquiree and the amount recognized for non-controlling interest over the net identifiable assets acquired and liabilities assumed. If the fair value of the net assets acquired is in excess of the aggregate consideration transferred and non-controlling interests, the difference is recognized as a gain on bargain purchase.

After initial recognition, goodwill is measured at cost less any accumulated impairment losses. For the purpose of impairment testing, goodwill acquired in a business combination is, from the acquisition date, allocated to each cash-generating unit (CGU) that is expected to benefit from the combination, irrespective of whether other assets or liabilities of the acquiree are assigned to those units. Each unit or groups of units to which the goodwill is so allocated represents the lowest level within the Company at which the goodwill is monitored for internal management purposes and cannot be larger than an operating segment before aggregation.

F-19

Where goodwill forms part of a CGU and part of the operation within that unit is disposed, the goodwill associated with the operation disposed is included in the carrying amount of the operation. Goodwill disposed in this circumstance is measured based on the relative values of the operation disposed and the portion of the CGU retained.

(5) Foreign Currency Transactions

The Company’s consolidated financial statements are presented in New Taiwan Dollars (NTD), which is also the parent company’s functional currency. Each entity in the Company determines its own functional currency and items included in the financial statements of each entity are measured using that functional currency.

Transactions in foreign currencies are initially recorded by the Company’s entities at their respective functional currency rates prevailing at the transaction date. Monetary assets and liabilities denominated in foreign currencies are translated into functional currency at the closing rates of exchange at the reporting date. Non-monetary items measured at fair value in foreign currencies are translated using the exchange rates at the date when the fair value is determined. Non-monetary items that are measured at historical cost in foreign currencies are translated using the exchange rates as at the dates of the initial transactions.

All exchange differences arising on the settlement of monetary items or on translating monetary items are taken to profit or loss in the period in which they arise except for the following:

a. Exchange differences arising from foreign currency borrowings for an acquisition of a qualifying asset to the extent that they are regarded as an adjustment to interest costs are included in the borrowing costs that are eligible for capitalization.

b. Foreign currency derivatives within the scope of IFRS 9 are accounted for based on the accounting policy for financial instruments.

c. Exchange differences arising on a monetary item that is part of a reporting entity’s net investment in a foreign operation are recognized initially in other comprehensive income and reclassified from equity to profit or loss upon disposal of such investment.

F-20

When a gain or loss on a non-monetary item is recognized in other comprehensive income, any exchange component of that gain or loss is recognized in other comprehensive income. When a gain or loss on a non-monetary item is recognized in profit or loss, any exchange component of that gain or loss is recognized in profit or loss.

(6) Translation of Foreign Currency Financial Statements

The assets and liabilities of foreign operations are translated into NTD at the closing rate of exchange prevailing at the reporting date and their income and expenses are translated at an average exchange rate for the period. The exchange differences arising on the translation are recognized in other comprehensive income. On disposal of a foreign operation, the cumulative amount of the exchange differences relating to that foreign operation, recognized in other comprehensive income and accumulated in the separate component of equity, is reclassified from equity to profit or loss when the gain or loss on disposal is recognized.

On partial disposal of a subsidiary that includes a foreign operation that does not result in a loss of control, the proportionate share of the cumulative amount of the exchange differences recognized in other comprehensive income is re-attributed to the non-controlling interests in that foreign operation. On partial disposal of an associate or a joint venture that includes a foreign operation that does not result in a loss of significant influence or joint control, only the proportionate share of the cumulative amount of the exchange differences recognized in other comprehensive income is reclassified to profit or loss.

Any goodwill and any fair value adjustments to the carrying amounts of assets and liabilities arising from the acquisition of a foreign operation are treated as assets and liabilities of the foreign operation and expressed in its functional currency.

(7) Convenience Translation into U.S. Dollars

Translations of amounts from NTD into U.S. dollars (USD) for the reader’s convenience were calculated at the rate of USD1.00 to NTD27.74 on December 30, 2021 released by Board of Governors of the Federal Reserve System. No representation is made that the NTD amounts could have been, or could be, converted into USD at this rate.

F-21

(8) Current and Non-Current Distinction

An asset is classified as current when:

a. the Company expects to realize the asset, or intends to sell or consume it, in its normal operating cycle;

b. the Company holds the asset primarily for the purpose of trading;

c. the Company expects to realize the asset within twelve months after the reporting period; or

d. the asset is cash or a cash equivalent unless the asset is restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period.

All other assets are classified as non-current.

A liability is classified as current when:

a. the Company expects to settle the liability in normal operating cycle;

b. the Company holds the liability primarily for the purpose of trading;

c. the liability is due to be settled within twelve months after the reporting period; or

d. the Company does not have an unconditional right to defer settlement of the liability for at least twelve months after the reporting date. Terms of a liability that could, at the option of the counterparty, result in its settlement by the issue of equity instruments do not affect its classification.

All other liabilities are classified as non-current.

(9) Cash Equivalents

Cash equivalents are short-term, highly liquid investments that are readily convertible to known amounts of cash and with maturity dates that do not present significant risks of changes in value resulting from changes in interest rates, including time deposits with original maturities of three months or less and repurchase agreements collateralized by government bonds and corporate bonds.

(10) Financial Instruments

Financial assets and financial liabilities are recognized when the Company becomes a party to the contractual provisions of the instrument. Purchase or sale of financial assets and liabilities are recognized using trade date accounting. All financial assets are recognized initially at fair value plus, in the case of investments not at fair value through profit or loss, directly attributable costs. Financial assets at fair value through profit or loss are initially recognized at fair value, and transaction costs are expensed in the statement of comprehensive income.

F-22

Financial Assets

a. Classification and subsequent measurement

The Company determines the classification of its financial assets at initial recognition. In accordance with IFRS 9, financial assets of the Company are classified as financial assets at fair value through profit or loss, financial assets at fair value through other comprehensive income, and financial assets measured at amortized cost.

i. Financial assets at fair value through profit or loss

Financial assets that are not measured at amortized cost or at fair value through other comprehensive income are recognized initially at fair value and subsequently measured at fair value with changes in fair value recognized in profit or loss.

ii. Financial assets at fair value through other comprehensive income

At initial recognition, the Company may make an irrevocable election to present in other comprehensive income subsequent changes in the fair value of an investment in an equity instrument that is not held for trading. When there is a disposal of such equity instrument, accumulated amounts presented in other comprehensive income are not subsequently transferred to profit or loss but are transferred directly to the retained earnings.

The debt instruments are measured at fair value through other comprehensive income if both of the following conditions are met:

(i) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and

(ii) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding.

F-23

Subsequent changes in the fair value of such financial assets at fair value through other comprehensive income are recognized in other comprehensive income. Before derecognition, impairment gains or losses, interest revenue and foreign exchange gains and losses are recognized in profit or loss. When the financial assets are derecognized the cumulative gain or loss previously recognized in other comprehensive income is reclassified from other comprehensive income to profit or loss as a reclassification adjustment.

iii. Financial assets measured at amortized cost

The financial assets are measured at amortized cost (including cash and cash equivalent, notes, accounts and other receivables and other financial assets) if both of the following conditions are met.

(i) the financial asset is held within a business model whose objective is to hold financial assets in order to collect contractual cash flows; and

(ii) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding.

Subsequent to initial recognition for financial assets measured at amortized cost, interest income, measured by the effective interest method amortization process, and impairment losses are recognized during circulation period. Gains and losses are recognized in profit or loss when the financial assets are derecognized.

b. Derecognition of financial assets

A financial asset is derecognized when:

i. the contractual rights to receive cash flows from the asset have expired;

ii. the Company has transferred assets and substantially all the risks and rewards of the asset have been transferred; or

iii. the Company has neither transferred nor retained substantially all the risks and rewards of the asset, but has transferred control of the asset.

F-24

On derecognition of a financial asset in its entirety, the difference between the carrying amount and the consideration received or to be received including any cumulative gain or loss that had been recognized in other comprehensive income is recognized in profit or loss (for debt instruments) or directly in retained earnings (for equity instruments).

If the transferred asset is part of a larger financial asset and the part transferred qualifies for derecognition in its entirety, the Company allocates the previous carrying amount of the larger financial asset between the part that continues to be recognized and the part that is derecognized, based on the relative fair values of those parts on the date of the transfer. Any cumulative gain or loss that had been recognized in other comprehensive income is allocated between the part that continues to be recognized and the part that is derecognized, based on the relative fair values of those parts. The difference between the carrying amount allocated to the part derecognized and the sum of the consideration received for the part derecognized and any cumulative gain or loss allocated that had been recognized in other comprehensive income, is recognized in profit or loss or directly in retained earnings.

c. Impairment policy

The Company measures, at each reporting date, an allowance for expected credit losses (ECLs) for debt instrument investments measured at fair value through other comprehensive income and financial assets measured at amortized cost by assessing reasonable and supportable information including forward-looking information. Where the credit risk on a financial asset has not increased significantly since initial recognition, the loss allowance is measured at an amount equal to 12-month ECLs. Where the credit risk on a financial asset has increased significantly since initial recognition, the loss allowance is measured at an amount equal to the lifetime ECLs.

For notes, accounts receivable and contract assets, the Company applies a simplified approach in calculating ECLs. Therefore, the Company does not track changes in credit risk, but instead recognizes a loss allowance based on lifetime ECLs at each reporting date. ECLs are measured based on the Company’s historical credit loss experience and customers’ current financial condition, adjusted for forward-looking factors, such as customers’ economic environment.

F-25

Financial Liabilities

a. Classification and subsequent measurement

The Company classifies the instrument issued as a financial liability or an equity instrument in accordance with the substance of the contractual arrangement and the definitions of a financial liability and an equity instrument.

i. Financial liabilities at fair value through profit or loss

Financial liabilities at fair value through profit or loss include financial liabilities held for trading and financial liabilities designated upon initial recognition as at fair value through profit or loss. Excluding changes in own credit risk, gains or losses on the subsequent measurement including interest paid are recognized in profit or loss.

ii. Financial liabilities measured at amortized cost

Financial liabilities measured at amortized cost include interest bearing loans and borrowings that are subsequently measured using the effective interest method after initial recognition. Gains and losses are recognized in profit or loss when the liabilities are derecognized as well as through the effective interest method amortization process.

Amortized cost is calculated by taking into account any discount or premium on acquisition and fees or transaction costs.

b. Derecognition of financial liabilities

A financial liability is derecognized when the obligation under the liability is discharged, cancelled or expires.

When an existing financial liability is replaced by another from the same lender on substantially different terms, or the terms of an existing liability are substantially modified (whether or not attributable to the financial difficulty of the debtor), such an exchange or modification is treated as a derecognition of the original liability and the recognition of a new liability, and the difference in the respective carrying amounts and the consideration paid, including any non-cash assets transferred or liabilities assumed, is recognized in profit or loss.

F-26

(11) Hedge Accounting

Cash flow hedges

The Company manages exposures arising from foreign currency exchange risk. With the adoption of IFRS 9, the Company designates a hedging relationship between the hedging instrument and the hedged item with the existence of an economic relationship and determines the hedge ratio to meet the hedge effectiveness. The Company designates certain hedging instruments to partially hedge the foreign currency exchange rate risks associated with certain highly probable forecast transactions. The separate component of equity associated with the hedged item is adjusted to the lower of the following (in absolute amounts):

a. the cumulative gain or loss on the hedging instrument from inception of the hedge; and

b. the cumulative change in fair value (present value) of the expected future cash flows on the hedged item from inception of the hedge.

The portion of the gain or loss on the hedging instrument that is determined to be an effective hedge is recognized in other comprehensive income, whereas the ineffective portion of the change in the fair value of the hedging instrument is recognized directly in profit or loss. If a hedge of a forecast transaction subsequently results in the recognition of a non-financial asset or a non-financial liability, the associated gains or losses that were recognized in other comprehensive income are included in the initial cost of the asset or liability.

The Company prospectively discontinues hedge accounting only when the hedging relationship ceases to meet the qualifying criteria; for instance when the hedging instrument expires or is sold, terminated or exercised.

(12) Inventories

Inventories are accounted for on a perpetual basis. Raw materials are stated at actual purchase costs, while the work in process and finished goods are stated at standard costs and subsequently adjusted to weighted-average costs at the end of each month. The cost of work in progress and finished goods comprises raw materials, direct labor, other direct costs and related production overheads. Allocation of fixed production overheads to the costs of conversion is based on the normal capacity of the production facilities. Cost associated with underutilized capacity is expensed as incurred. Inventories are valued at the lower of cost and net realizable value item by item. Net realizable value is the estimated selling price in the ordinary course of business less the estimated costs of completion and the estimated costs necessary to make the sale.

F-27

(13) Investments Accounted for Under the Equity Method

The Company’s investments in associates and joint ventures are accounted for using the equity method other than those that meet the criteria to be classified as non-current assets held for sale.

An associate is an entity over which the Company has significant influence and that is neither a subsidiary nor a joint venture. Significant influence is the power to participate in the financial and operating policy decisions of an entity, but is not control or joint control over those policies.

A joint venture is a type of joint arrangement whereby the Company that has joint control of the arrangement has rights to the net assets of the joint venture. Joint control is the contractually agreed sharing of control of an arrangement where no single party controls the arrangement on its own, which exists only when decisions about the relevant activities require unanimous consent of the parties sharing control.

Any difference between the acquisition cost and the Company’s share of the net fair value of the identifiable assets and liabilities of associates and joint ventures is accounted for as follows:

a. Any excess of the acquisition cost over the Company’s share of the net fair value of the identifiable assets and liabilities of an associate or a joint venture at the date of acquisition is recognized as goodwill and is included in the carrying amount of the investment. Amortization of goodwill is not permitted.

b. Any excess of the Company’s share of the net fair value of the identifiable assets and liabilities of an associate or a joint venture over the acquisition cost, after reassessing the fair value, is recognized as a gain in profit or loss on the acquisition date.

Under the equity method, the investments in associates and joint ventures are carried on the balance sheet at cost plus post acquisition changes in the Company’s share of profit or loss and other comprehensive income of associates and joint ventures. The Company’s share of changes in associates’ and joint ventures’ profit or loss and other comprehensive income are recognized directly in profit or loss and other comprehensive income, respectively. Distributions received from an associate or a joint venture reduce the carrying amount of the investment. Any unrealized gains and losses resulting from transactions between the Company and the associate or the joint venture are eliminated to the extent of the Company’s interest in the associate or the joint venture.

F-28

Financial statements of associates and joint ventures are prepared for the same reporting period as the Company. Where necessary, adjustments are made to bring the accounting policies in line with those of the Company.

Upon an associate’s issuance of new shares, if the Company takes up more shares than its original proportionate holding while maintaining its significant influence over that associate, such increase would be accounted for as an acquisition of an additional equity interest in the associate. Upon an associate’s issuance of new shares, if the Company does not take up proportionate shares resulting in decrease in its stockholding percentage while maintaining its significant influence over that associate, the Company treats the transaction as deemed disposal and reclassifies to profit or loss or other appropriate account(s) the proportion of the gain or loss previously recognized in other comprehensive income relating to that reduction in ownership interest.

The Company ceases to use the equity method upon loss of significant influence over an associate. Any difference between the carrying amount of the investment in an associate upon loss of significant influence and the fair value of the retained investment plus proceeds from disposal will be recognized in profit or loss. If an investment in an associate becomes an investment in a joint venture or an investment in a joint venture becomes an investment in an associate, the Company continues to apply the equity method and does not remeasure the retained interest.

The Company determines at each reporting date whether there is any objective evidence that the investments in associates and joint ventures are impaired. An impairment loss, being the difference between the recoverable amount of the associate or joint venture and its carrying amount, is recognized in profit or loss in the statement of comprehensive income and forms part of the carrying amount of the investments.

(14) Property, Plant and Equipment

Property, plant and equipment are stated at cost, net of accumulated depreciation and accumulated impairment losses, if any, and any borrowing costs incurred for long-term construction projects are capitalized if the recognition criteria are met. Significant renewals, improvements and major inspections meeting the recognition criteria are treated as capital expenditures, and the carrying amounts of those replaced parts are derecognized. Maintenance and repairs are recognized in expenses as incurred. Any gain or loss arising from derecognition of the assets is recognized in other operating income and expenses.

F-29

Depreciation is calculated on a straight-line basis over the estimated useful lives. A significant part of an item of property, plant and equipment which has a different useful life from the remainder of the item is depreciated separately.

The depreciation methods, useful lives and residual values for the assets are reviewed at each fiscal year end, and the changes from the previous estimation are recorded as changes in accounting estimates.

Except for land, which is not depreciated, the estimated useful lives of the assets are as follows:

Buildings	7-56 years
Machinery and equipment	6-7 years
Transportation equipment	6-7 years
Furniture and fixtures	3-7 years
Leasehold improvement	The shorter of lease terms or useful lives

(15) Lease

A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange of consideration, and to obtain substantially all economic benefits from use of the identified asset. The Company accounts for a lease contract as a single lease and separates the lease and non-lease components included in the contract.

The Company as a lessor

The Company recognizes lease payments from operating leases as rental income on a straight-line basis over the term of the lease.

The Company as a lessee

At the commencement date of a lease, a lessee is required to recognize right-of-use assets and lease liabilities, except for short-term leases and low-value asset leases.

F-30

a. At the commencement date, lease liabilities should be recognized and measured at the present value of the lease payments that have not been paid at that date, using the Company’s incremental borrowing rate. The payments comprise:

i. fixed payments less any lease incentives receivable;

ii. variable lease payments that depend on an index or rate;

iii. amounts expected to be payable by the Company under residual value guarantees;

iv. the exercise price of a purchase option if the Company is reasonably certain to exercise; and

v. payments for terminating the lease unless it is reasonably certain that early termination will not occur.

Lease liabilities are measured in subsequent periods using the effective interest method, and the interest expenses are recognized over the lease terms. In addition, the carrying amount of lease liabilities is remeasured if there is a modification which is not accounted as a separate lease, a change in the lease term, a change in the lease payments (e.g., changes to future payments resulting from a change in an index or rate used to determine such lease payments) or a change in the assessment of an option to purchase the underlying asset.

b. At the commencement date, the right-of-use assets should be measured at cost, which comprise of:

i. the amount of the initial measurement of the lease liabilities;

ii. any lease payments made at or before the commencement date; and

iii. any initial direct costs incurred.

Subsequent to initial recognition, the right-of-use assets are measured using cost model. Right-of-use assets measured under the cost model are depreciated from the commencement date to the earlier of the end of the useful life of the right-of-use assets or the end of the lease terms. Any remeasurement of the lease liabilities results in a corresponding adjustment of the right-of-use assets.

The Company presents right-of-use assets and lease liabilities on the balance sheets, and depreciation expenses and interest expenses are separately presented in the statements of comprehensive income. The Company recognizes the lease payments associated with short-term leases and low-value asset leases as expenses on a straight-line basis over the lease terms.

F-31

(16) Intangible Assets

Intangible assets acquired separately are measured on initial recognition at cost. The cost of intangible assets acquired in a business combination is its fair value as at the date of acquisition. Following initial recognition, intangible assets are carried at cost less any accumulated amortization and accumulated impairment losses, if any. Internally generated intangible assets which fail to meet the recognition criteria are not capitalized and the expenditures are reflected in profit or loss in the period incurred.

The useful lives of intangible assets are assessed as either finite or indefinite.

Intangible assets with finite useful lives are amortized over the useful lives and assessed for impairment whenever there is an indication that the intangible assets may be impaired. The amortization period and the amortization method for an intangible asset with a finite useful life are reviewed at least at the end of each fiscal year. Changes in the expected useful life or the expected pattern of consumption of future economic benefits embodied in the asset is accounted for by changing the amortization period or method, as appropriate, and is treated as changes in accounting estimates.

Intangible assets with indefinite useful lives are not amortized, but are tested for impairment annually, either individually or at the CGU level. The assessment of indefinite useful life is reviewed annually to determine whether the indefinite useful life continues to be supportable. If not, the change in useful life from indefinite to finite is made on a prospective basis.

Gains or losses arising from derecognition of an intangible asset are recognized in other operating income and expenses.

Accounting policies of the Company’s intangible assets are summarized as follows:

a. Goodwill arising from business combinations is not amortized, and is tested for impairment annually or more frequently if events or changes in circumstances suggest that the carrying amount may not be recoverable. If an event occurs or circumstances change which indicates that the goodwill is impaired, an impairment loss is recognized. Goodwill impairment losses cannot be reversed once recognized.

b. Software is amortized over the contract term or estimated useful life (3-6 years) on a straight-line basis.

F-32

c. Patent and technology license fee: Upon signing of contract and obtaining the right to intellectual property, any portion attributable to non-cancellable and mutually agreed future fixed license fees for patent and technology is discounted and recognized as an intangible asset and related liability. The cost of the intangible asset is not revalued once determined on initial recognition, and is amortized over the useful life (5-10 years) on a straight-line basis. Interest expenses from the related liability are recognized and calculated based on the effective interest method. Based on the timing of payments, the liability is classified as current and non-current.

d. Others are mainly the intellectual property license fees, amortized over the shorter of the contract term or estimated useful life (3 years) of the related technology on a straight-line basis.

(17) Impairment of Non-Financial Assets

The Company assesses at each reporting date whether there is an indication that an asset in the scope of IAS 36 “Impairment of Assets” may be impaired. If any indication exists, the Company completes impairment testing for the CGU to which the individual assets belong. Where the carrying amount of an asset or CGU exceeds its recoverable amount, the asset is considered impaired and is written down to its recoverable amount. The recoverable amount of an individual asset or a CGU is the higher of its fair value less costs of disposal and its value in use. If circumstances indicate that previously recognized impairment losses may no longer exist or may have decreased at each reporting date, the Company re-assesses the asset’s or CGU’s recoverable amount. A previously recognized impairment loss is reversed only if there has been an increase in the estimated service potential of an asset which in turn increases the recoverable amount since the last impairment loss was recognized. The reversal is limited so that the carrying amount of the asset does not exceed its recoverable amount, nor exceed the carrying amount that would have been determined, net of depreciation or amortization, had no impairment loss been recognized for the asset in prior years.

A CGU, or group of CGUs, to which goodwill has been allocated is tested for impairment annually at the same time every year, irrespective of whether there is any indication of impairment. Where the carrying amount of a CGU (including the carrying amount of goodwill) exceeds its recoverable amount, the CGU is considered impaired. If an impairment loss is to be recognized, it is first allocated to reduce the carrying amount of any goodwill allocated to the CGU (group of units), then to the other assets of the unit (group of units) pro rata on the basis of the carrying amount of each asset in the unit (group of units). Impairment losses relating to goodwill cannot be reversed in future periods.

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The recognition or reversal of impairment losses is classified as other operating income and expenses.

(18) Bonds

Convertible bonds

UMC evaluates the terms of the convertible bonds issued to determine whether it contains both a liability and an equity component. Furthermore, UMC assesses if the economic characteristics and risks of the put and call options embedded in the convertible bonds are closely related to the economic characteristics and risk of the host contract before separating the equity element.

For the liability component excluding the derivatives, its fair value is determined based on the effective interest rate applied at that time by the market to instruments of comparable credit status. The liability component is classified as a financial liability measured at amortized cost using the effective interest method before the instrument is converted or settled. For the embedded derivative that is not closely related to the host contract, it is classified as a liability component and subsequently measured at fair value through profit or loss unless it qualifies as an equity component. The equity component is recognized initially at the difference between the fair value of the compound financial instrument as a whole and the fair value of the liability component. Its carrying amount is not remeasured in the subsequent accounting periods. If the convertible bond issued does not have an equity component, it is accounted for as a hybrid instrument in accordance with the requirements under IFRS 9.

If the convertible bondholders exercise their conversion right before maturity, UMC shall adjust the carrying amount of the liability component. The adjusted carrying amount of the liability component at conversion and the carrying amount of equity component are credited to common stock and additional paid-in capital-premiums. No gain or loss is recognized upon bond conversion.

In addition, the liability component of convertible bonds is classified as a current liability if within 12 months the bondholders may exercise the put right. After the put right expires, the liability component of the convertible bonds should be reclassified as a non-current liability if it meets the definition of a non-current liability in all other respects.

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Exchangeable bonds

In accordance with IFRS 9, if the economic characteristics and risks of the embedded derivative are not closely related to the economic characteristics and risks of the host, the derivative financial instruments embedded in exchangeable bonds would be separated from the host and accounted for as financial assets or liabilities at fair value through profit or loss.

UMC has issued exchangeable bonds where the bondholders may exchange the bonds into ordinary shares of certain public entities which UMC holds as financial assets (“reference shares”). When exchangeable bondholders exercise their right to exchange their bonds for reference shares, the carrying amount of the bonds and the related assets or liabilities accounts will be derecognized, and the difference will be recognized in profit or loss.

Both the host and embedded derivative financial instrument in exchangeable bonds are classified as current liabilities as the bondholders have the right to demand settlement by exercising the exchange option of the bonds within 12 months.

(19) Post-Employment Benefits

Under defined contribution pension plans, the contribution payable to the plan in exchange for the service rendered by an employee during a period shall be recognized as an expense. The contribution payable, after deducting any amount already paid, is recognized as a liability.

Under defined benefit pension plans, the net defined benefit liability (asset) shall be recognized as the amount of the present value of the defined benefit obligation, deducting the fair value of any plan assets and adjusting for any effect of the asset ceiling. Service cost and net interest on the net defined benefit liability (asset) are recognized as expenses in the period of service. Remeasurement of the net defined benefit liability (asset), which comprises actuarial gains and losses, the return on plan assets and any change in the effect of the asset ceiling, excluding any amounts included in net interest, is recognized in other comprehensive income in the period in which they occur. Remeasurement recognized in other comprehensive income is reflected immediately in retained earnings and shall not be reclassified to profit or loss in a subsequent period.

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(20) Government Grants

In accordance with IAS 20 “Accounting for Government Grants and Disclosure of Government Assistance”, the Company recognizes the government grants when there is reasonable assurance that such grants will be received and the conditions attaching to them will be complied with.

An asset related government grant is recorded as deferred income and recognized in profit or loss on a straight-line basis over the useful lives of the assets. An expense related government grant is recognized in profit or loss on a systematic basis over the periods in which the Company recognizes as expenses the related costs for which the grant is intended to compensate. A government grant that compensates for expenses or losses already incurred or for the purpose of giving immediate financial support to the Company with no future related costs is recognized in profit or loss when it becomes receivable.

(21) Treasury Stock

UMC’s own equity instruments repurchased (treasury stocks) are recognized at repurchase cost and deducted from equity. No gain or loss shall be recognized in profit or loss on the purchase, sale, issue or cancellation of UMC’s own equity instruments. Any difference between the carrying amount and the consideration is recognized in equity.

(22) Share-Based Payment Transactions

Equity-settled share-based payment transactions

The compensation cost of equity-settled transactions between the Company and its employees is measured at the fair value of the equity instruments on the grant date, and is recognized as expense, together with a corresponding increase in equity, over the vesting period. When issuing restricted stocks for employees, the unvested restricted stocks issued on the grant date for employees are recognized in unearned employee compensation as a transitional contra equity account and such account shall be amortized as compensation expense over the vesting period. The cumulative expense recognized for equity-settled transactions at each reporting date until the vesting date reflects the extent to which the vesting period has passed and the Company’s best estimate of the quantity of equity instruments that will ultimately vest. The movement in cumulative cost recognized at the beginning and end of the period is recognized through profit or loss for the period.

F-36

No expense is recognized for awards that do not ultimately vest, except for equity-settled transactions where vesting is conditional upon a market or non-vesting condition. The Company shall recognize the services received in expense irrespective of whether or not the market or non-vesting condition is satisfied, provided that all other performance and/or service conditions are satisfied.

Where the terms of an equity-settled transaction award are modified, the minimum expense recognized is the expense as if the terms had not been modified, if the original terms of the award are met. An additional expense is recognized for any modification that increases the total fair value of the share-based payment transaction, or is otherwise beneficial to the employee as measured at the date of modification.

Where an equity-settled award is cancelled, it is treated as if it fully vests on the date of cancellation, and any expense not yet recognized for the award is recognized immediately. This includes any award where non-vesting conditions within the control of either the entity or the employee are not met. However, if a new award substitutes for the cancelled award and is designated as a replacement award on the date that it is granted, the cancelled and new awards are treated as if they were a modification of the original award.

Cash-settled share-based payment transactions

The compensation cost of cash-settled share-based payment transactions between the Company and its employees is measured at the fair value of the liability incurred and recognized as expense with corresponding liability over the vesting period. The fair value of the liability is remeasured at the end of each reporting period and at the settlement date with the movement in fair value recognized through profit or loss for the period until the liability is settled.

(23) Revenue Recognition

Revenue from Contracts with Customers

The Company recognizes revenue from contracts with customers by applying the following steps of IFRS 15 “Revenue from Contracts with Customers”:

a. identify the contract with a customer;

b. identify the performance obligations in the contract;

c. determine the transaction price;

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d. allocate the transaction price to the performance obligations in the contract; and

e. recognize revenue when (or as) the entity satisfies its performance obligations.

Revenues on the Company’s contracts with customers for the sales of wafers and joint technology development are recognized as the Company satisfies its performance obligations to customers upon transfer of control of promised goods and services. The Company recognizes revenue at transaction price that are determined using contractual prices reduced by sales returns and allowances which the Company estimates based on historical experience having determined that a significant reversal in the amount of cumulative revenue recognized are not probable to occur. The Company recognizes refund liabilities for estimated sales return and allowances based on the customer complaints, historical experience, and other known factors.

The Company recognizes accounts receivable when the Company transfers control of the goods or services to customers and has a right to an amount of consideration that is unconditional. Such accounts receivable are short term and do not contain a significant financing component. For certain contracts that do not provide the Company unconditional rights to the consideration, and the transfer of control of the goods or services has been satisfied, the Company recognizes contract assets and revenues.

Consideration received from customers prior to the Company having satisfied its performance obligations are accounted for as contract liabilities which are transferred to revenue after the performance obligations are satisfied. The Company recognizes costs to fulfill a contract when the costs relate directly to the contract, generate or enhance resources to be used to satisfy performance obligations in the future, and are expected to be recovered. The costs and revenues are recognized when the Company satisfies its performance obligations to customers upon transfer of control of promised goods and services.

Interest income

For financial assets measured at amortized cost and financial assets at fair value through other comprehensive income, interest income is recorded using the effective interest method and recognized in profit or loss.

Dividends

Revenue is recognized when the Company’s right to receive the dividends is established, which is generally when shareholders approve the dividend.

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(24) Income Tax

Income tax expense (benefit) is the aggregate amount of current income tax and deferred income tax included in the determination of profit or loss for the period.

Current income tax

Current income tax assets and liabilities for the current period and prior periods are measured using the tax rates and tax laws that have been enacted or substantively enacted by the end of the reporting period. Current income tax relating to items recognized directly in other comprehensive income or equity is recognized in other comprehensive income or equity rather than profit or loss.

Undistributed earnings, calculated based on Business Entity Accounting Act are subject to a tax in accordance with the Income Tax Law of the R.O.C. Accordingly, the undistributed tax impact is provided in the period the income is earned, assuming that no earnings are distributed. Any reduction in the liability will be recognized when the income is distributed upon the shareholders’ approval in the subsequent year. Tax on undistributed earnings may be offset by the Company’s available tax credits carried forward, where applicable. As such, the incremental tax accrued on undistributed earnings may be offset by a corresponding reduction in deferred income tax assets, where applicable.

Deferred income tax

Deferred income tax is determined using the liability method on temporary differences between the tax bases of assets and liabilities and their carrying amounts in financial statements at the reporting date.

Deferred tax liabilities are recognized for all taxable temporary differences, except:

a. When the deferred tax liability arises from the initial recognition of goodwill or of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss;

b. In respect of taxable temporary differences associated with investments in subsidiaries, associates and joint ventures, when the timing of the reversal of the temporary differences can be controlled and it is probable that the temporary differences will not reverse in the foreseeable future.

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Deferred tax assets are recognized for all deductible temporary differences, the carryforward of unused tax losses and unused tax credits, to the extent that it is probable that future taxable profit will be available against which the deductible temporary differences and the carryforward of unused tax losses and unused tax credits can be utilized, except:

a. Where the deferred tax asset relating to the deductible temporary difference arises from the initial recognition of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss;

b. In respect of deductible temporary differences associated with investments in subsidiaries, associates and joint ventures, deferred tax assets are recognized only to the extent that it is probable that the temporary differences will reverse in the foreseeable future and taxable profit will be available against which the temporary differences can be utilized.

Deferred tax assets and liabilities are measured at the tax rates that are expected to apply in the year when the asset is realized or the liability is settled, based on tax rates and tax laws that have been enacted or substantively enacted at the reporting date. The measurement of deferred tax assets and liabilities reflects the tax consequences that would follow the manner in which the Company expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred tax relating to items recognized outside profit or loss is not recognized in profit or loss but rather in other comprehensive income or directly in equity. Deferred tax assets are reassessed and recognized at each reporting date. Unrecognized deferred tax assets are reassessed at each reporting date and are recognized to the extent that it has become probable that future taxable profits will allow the deferred tax assets to be recovered.

Deferred tax assets and liabilities offset each other, if a legally enforceable right exists to set off current income tax assets against current income tax liabilities, and the deferred taxes relate to the same taxable entity and the same taxation authority.

Tax benefits acquired as part of a business combination, but not satisfying the criteria for separate recognition at the acquisition date, might be realized and recognized subsequently as follows:

a. Acquired deferred tax benefits recognized within the measurement period that result from new information about facts and circumstances that existed at the acquisition date shall be applied to reduce the carrying amount of any goodwill related to that acquisition. If the carrying amount of that goodwill is nil, any remaining deferred tax benefits shall be recognized in profit or loss;

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b. All other acquired deferred tax benefits realized shall be recognized in profit or loss, other comprehensive income or equity.

The Company has considered whether it is probable that a taxation authority will accept the uncertain tax treatments used in its income tax filings. If the Company concludes that it is probable that the taxation authority will accept an uncertain tax treatment, the Company determines the taxable profit, tax bases, unused tax losses, unused tax credits or tax rates consistently with the tax treatments used or planned to be used in its income tax filings. If it is not probable that the taxation authority will accept an uncertain tax treatment, the Company makes estimates using either the most likely amount or the expected value of the tax treatment, depending on which method the Company expects to better predict the resolution of the uncertainty. The Company reassesses a judgement or estimate if the facts and circumstance change.

(25) Earnings per Share

Earnings per share is computed according to IAS 33 “Earnings per Share”. Basic earnings per share is computed by dividing net income by the weighted-average number of ordinary shares outstanding during the current reporting period. Diluted earnings per share is computed by taking basic earnings per share into consideration plus additional ordinary shares that would have been outstanding if the dilutive share equivalents had been issued. Net income is also adjusted for interest and other income or expenses derived from any underlying dilutive share equivalents. The weighted-average of outstanding shares is adjusted retroactively for stock dividends and employee stock compensation issues.

5. SIGNIFICANT ACCOUNTING JUDGMENTS, ESTIMATES AND ASSUMPTIONS

The preparation of the Company’s consolidated financial statements requires management to make judgments, estimates and assumptions that affect the reported amounts of revenues, expenses, assets, liabilities, the accompanying disclosures and the disclosure of contingent liabilities. However, uncertainty about these assumptions and estimates could result in outcomes that require a material adjustment to the carrying amount of assets or liabilities affected in future periods.

F-41

The key assumptions concerning the future and other key sources of estimating uncertainty at the reporting date that would have a significant risk for a material adjustment to the carrying amounts of assets or liabilities within the next fiscal year are discussed below.

The Company bases its assumptions and estimates on information available when the consolidated financial statements were prepared. Existing circumstances and assumptions about future developments, however, may change due to market changes or circumstances arising beyond the control of the Company. Such changes are reflected in the assumptions when they occur. Given the global economic climate and unforeseen effects from COVID-19 pandemic, the process of estimation has become more challenging. Actual results could differ from those estimates, and as such, differences may be material to the consolidated financial statements.

(1) The Fair Value of Level 3 Financial Instruments

Where the fair values of the level 3 financial assets recorded on the balance sheet cannot be derived from active markets, they are determined by the application of an appropriate valuation method which was mainly the market approach. The valuation of these financial assets involves significant judgments such as the selection of comparable companies or equity transaction prices and the application of assumptions such as discounts for lack of marketability, valuation multiples, etc. Changes in assumptions about these factors could affect the reported fair value of the financial assets. Please refer to Note 11 for more details.

(2) Inventories

Inventories are valued at the lower of cost and net realizable value item by item. Net realizable value is the estimated selling price in the ordinary course of business less the estimated costs of completion and the estimated costs necessary to make the sale. Please refer to Note 6(5). Costs of completion include direct labor and overhead, including depreciation and maintenance of production equipment, indirect labor costs, indirect material costs, supplies, utilities and royalties that is expected to be incurred at normal production level. The Company estimates normal production level taking into account loss of capacity resulting from planned maintenance, based on historical experience and current production capacity.

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(3) Income Tax

Uncertainties exist with respect to the interpretation of complex tax regulations, changes in tax laws, and the amount and timing of future taxable income. The Company establishes provisions, based on reasonable estimates, for possible consequences of audits by the tax authorities of the respective countries in which it operates. The amount of such provisions is based on various factors, such as experience of previous tax audits and different interpretations of tax regulations made by the taxable entity and the responsible tax authority. Such differences of interpretation may arise on a wide variety of issues depending on the conditions prevailing in the respective domicile of the Company.

Deferred tax assets are recognized for all carryforward of unused tax losses, tax credits and deductible temporary differences to the extent that it is probable that future taxable profit will be available or there are sufficient taxable temporary differences against which the unused tax losses, unused tax credits or deductible temporary differences can be utilized. The amount of deferred tax assets determined to be recognized is based upon the likely timing and the level of future taxable profits and taxable temporary differences. Please refer to Note 6(25) for more details on unrecognized deferred tax assets.

6. CONTENTS OF SIGNIFICANT ACCOUNTS

(1) Cash and Cash Equivalents

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Cash on hand and petty cash	$	5,765	$	5,684
Checking and savings accounts		20,163,007		33,738,883
Time deposits		66,939,601		88,876,572
Repurchase agreements collateralized by government bonds and corporate notes		6,939,663		10,000,992
Total	$	94,048,036	$	132,622,131

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(2) Financial Assets at Fair Value through Profit or Loss

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets mandatorily measured at fair value through profit or loss
Common stocks	$	9,654,682	$	13,289,438
Preferred stocks		3,299,004		2,602,622
Funds		2,674,476		3,862,932
Convertible bonds		412,175		691,303
Forward contracts		2,384		—
Total	$	16,042,721	$	20,446,295
Current	$	1,216,634	$	945,021
Non-current		14,826,087		19,501,274
Total	$	16,042,721	$	20,446,295

UMC’s subsidiary, FORTUNE VENTURE CAPITAL CORP., exchanged shares with CHIPBOND TECHNOLOGY CORPORATION (CHIPBOND) on November 5, 2021, and obtained 14 million common shares newly issued by CHIPBOND. Please refer to Note 6(18) for further information.

(3) Financial Assets at Fair Value through Other Comprehensive Income

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Equity instruments
Common stocks	$	10,355,999	$	19,683,806
Preferred stocks		170,145		151,859
Total	$	10,526,144	$	19,835,665
Current	$	—	$	8,482,334
Non-current		10,526,144		11,353,331
Total	$	10,526,144	$	19,835,665

The fair value of each investment in equity instrument to be measured at fair value through other comprehensive income is as follows:

		As of December 31,
Type of securities	Name of securities	2020		2021
		NT$		NT$
		(In Thousands)		(In Thousands)
Common stock	SILICON INTEGRATED SYSTEMS CORP.		2,039,645		3,407,886
Common stock	UNIMICRON HOLDING LIMITED		722,122		1,461,098
Common stock	ITE TECH. INC.		950,674		1,514,658
Common stock	CHIPBOND TECHNOLOGY CORPORATION		—		3,546,027
Common stock	NOVATEK MICROELECTRONICS CORP.		6,068,053		8,863,632
Common stock	SHIN-ETSU HANDOTAI TAIWAN CO., LTD.		575,505		890,505
Preferred stock	MTIC HOLDINGS PTE. LTD.		170,145		151,859

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a. These investments in equity instruments are held for medium to long-term purposes and therefore are accounted for as fair value through other comprehensive income. UMC exchanged shares with CHIPBOND on November 5, 2021, and obtained 53 million common shares newly issued by CHIPBOND for the strategic cooperation between the Company and CHIPBOND. Please refer to Note 6(18) for further information.

b. Dividend income recognized in profit or loss from equity instruments designated as fair value through other comprehensive income are listed below:

	For the years
	ended December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Held at end of period	$	286,795	$	465,679
Derecognized during the period		—		—
Total	$	286,795	$	465,679

c. In consideration of the Company’s investment strategy, the Company disposed and derecognized certain investments designated as fair value through other comprehensive income. Details on derecognition of such investments are listed below:

	For the years
	ended December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Fair value on the date of disposal	$	9,012,450	$	—
Cumulative gains (losses) reclassified to retained earnings due to derecognition	$	1,825,365	$	—

Please refer to UNIMICRON in Note 6(6) for further information of 2020.

d. UMC issued unsecured exchangeable bonds where the bondholders may exchange the bonds at any time on or after October 8, 2021 and prior to June 27, 2026 into Novatek common shares which UMC holds and accounts for as equity instruments investments measured at fair value through other comprehensive income. Please refer to Note 6(13) for the Company’s unsecured exchangeable bonds.

(4) Accounts Receivable, Net

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Accounts receivable	$	27,300,439		$	34,818,600
Less: loss allowance		(206,084	)		(194,491	)
Net	$	27,094,355		$	34,624,109

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Aging analysis of accounts receivable:

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Neither past due	$	23,801,905	$	30,758,397
Past due:
≤ 30 days		2,730,865		3,294,617
31 to 60 days		95,398		138,854
61 to 90 days		13,258		8,026
91 to 120 days		23,774		43,413
≥ 121 days		635,239		575,293
Subtotal		3,498,534		4,060,203
Total	$	27,300,439	$	34,818,600

Movement of loss allowance for accounts receivable:

	For the years ended December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Beginning balance	$	621,410		$	206,084
Net reversal for the period		(415,326	)		(11,593	)
Ending balance	$	206,084		$	194,491

The collection periods for third party domestic sales and third party overseas sales were month-end 30-60 days and net 30-60 days, respectively.

An impairment analysis is performed at each reporting date to measure expected credit losses (ECLs) of accounts receivable. For the receivables past due within 60 days, including not past due, the Company estimates an expected credit loss rate to calculate ECLs. For the years ended December 31, 2019, 2020 and 2021, the expected credit loss rates were not greater than 0.2%. The rate is determined based on the Company’s historical credit loss experience and customer’s current financial condition, adjusted for forward-looking factors such as customer’s economic environment. For the receivables past due over 60 days, the Company applies the aforementioned rate and assesses individually whether to recognize additional expected credit losses by considering customer’s operating condition and debt-paying ability.

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(5) Inventories, Net

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Raw materials	$	5,507,002	$	3,371,520
Supplies and spare parts		4,290,672		5,106,770
Work in process		11,872,971		14,043,143
Finished goods		881,841		489,750
Total	$	22,552,486	$	23,011,183

a. For the years ended December 31, 2019, 2020 and 2021, the Company recognized NT$122,999 million, NT$133,143 million and NT$135,856 million, respectively, in operating costs, of which NT$820 million in 2019 was related to write-down of inventories, and NT$272 million and NT$426 million in 2020 and 2021, respectively, were related to reversal of write-down of inventories.

b. None of the aforementioned inventories were pledged.

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(6) Investments Accounted for Under the Equity Method

a. Details of investments accounted for under the equity method are as follows:

	As of December 31,
	2020				2021
Investee companies	Amount		Percentage of ownership or voting rights		Amount		Percentage of ownership or voting rights
	NT$				NT$
	(In Thousands)				(In Thousands)
Listed companies
FARADAY TECHNOLOGY CORP. (FARADAY) (Note A)	$	1,583,971		13.78	$	1,767,821		13.78
UNIMICRON TECHNOLOGY CORP. (UNIMICRON) (Note B)		9,072,632		13.36		10,337,813		13.30
Unlisted companies
MTIC HOLDINGS PTE. LTD. (Note C)		26,966		45.44		—		45.44
PURIUMFIL INC.		6,206		44.45		7,253		44.45
UNITECH CAPITAL INC.		823,185		42.00		976,559		42.00
TRIKNIGHT CAPITAL CORPORATION		2,481,874		40.00		4,044,867		40.00
HSUN CHIEH CAPITAL CORP.		195,675		40.00		229,598		40.00
HSUN CHIEH INVESTMENT CO., LTD.		2,312,698		36.49		3,437,053		36.49
YANN YUAN INVESTMENT CO., LTD.		3,554,979		30.87		7,013,118		28.22
UNITED LED CORPORATION HONG KONG LIMITED		96,026		25.14		98,954		25.14
VSENSE CO., LTD. (Note C)		941		23.98		—		23.98
TRANSLINK CAPITAL PARTNERS I, L.P. (Note D)		174,985		10.38		225,342		10.38
Total	$	20,330,138			$	28,138,378

Note A: Beginning from June 2015, the Company accounts for its investment in FARADAY as an associate given the fact that the Company obtained the ability to exercise significant influence over FARADAY through representation on its Board of Directors.

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Note B: Beginning from June 2020, the Company accounts for its investment in UNIMICRON as an associate given the fact that the Company obtained the ability to exercise significant influence over UNIMICRON through representation on its Board of Directors. UNIMICRON was previously measured at fair value through other comprehensive income and reclassified as investments accounted for under the equity method. Cumulative fair value changes that was previously recognized in other comprehensive income up to reclassification date was reclassified to retained earnings in the current period.

Note C: When the Company’s share of losses of an associate equals or exceeds its interest in that associate, the Company discontinues recognizing its share of further losses. Additional losses and liabilities are recognized only to the extent that the Company has incurred legal or constructive obligations or made payments on behalf of that associate.

Note D: The Company follows international accounting practices in equity accounting for limited partnerships and uses the equity method to account for these investees.

The carrying amount of investments accounted for using the equity method for which there are published price quotations amounted to NT$10,657 million and NT$12,106 million, as of December 31, 2020 and 2021, respectively. The fair value of these investments were NT$18,885 million and NT$53,491 million, as of December 31, 2020 and 2021, respectively.

Although the Company is the largest shareholder of some associates; after comprehensive assessment, the Company does not own the major voting rights as the remaining voting rights holders are able to align and prevent the Company from ruling the relevant operation. Therefore, the Company does not control but owns significant influence over the aforementioned associates.

None of the aforementioned associates were pledged.

b. Financial information of associates :

There is no individually significant associate for the Company. For individually immaterial associates, the following tables summarize the amount recognized by the Company at its share of those associates separately. When an associate is a foreign operation, and the functional currency of the foreign entity is different from the Company, an exchange difference arising from translation of the foreign entity will be recognized in other comprehensive income (loss). Such exchange differences recognized in other comprehensive income (loss) in the financial statements for the years ended December 31, 2019, 2020 and 2021 were NT$(9) million, NT$(53) million and NT$(30) million, respectively, which were not included in the following table.

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The aggregate amount of the Company’s share of all its individually immaterial associates that are accounted for using the equity method were as follows:

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Profit from continuing operations	$	115,329	$	1,300,263	$	5,193,495
Other comprehensive income		873,308		973,946		2,965,202
Total comprehensive income	$	988,637	$	2,274,209	$	8,158,697

(7) Other current assets

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Time deposits with original maturities of over three months to a year	$	14,305,779	$	28,834,684
Others		2,945,390		2,988,182
Total	$	17,251,169	$	31,822,866

F-50

(8) Property, Plant and Equipment

2020

a. Assets Used by the Company:

Cost:

	Land			Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection			Total
	NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2020	$	1,692,123		$	38,437,588		$	865,547,572		$	65,909		$	6,842,124		$	65,883		$	5,583,516		$	918,234,715
Additions		—			—			—			—			—			—			26,420,747			26,420,747
Disposals		—			(1,316,833	)		(5,305,744	)		(10,856	)		(169,716	)		—			(12,938	)		(6,816,087	)
Transfers and reclassifications		—			109,586			17,142,065			—			246,622			62			(15,528,464	)		1,969,871
Exchange effect		(1,510	)		27,169			(5,814,568	)		(155	)		(10,252	)		(2,171	)		66,435			(5,735,052	)
As of December 31, 2020	$	1,690,613		$	37,257,510		$	871,569,325		$	54,898		$	6,908,778		$	63,774		$	16,529,296		$	934,074,194

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection		Total
	NT$		NT$			NT$			NT$			NT$			NT$			NT$		NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)
As of January 1, 2020	$	—	$	18,950,520		$	745,722,965		$	47,794		$	5,383,434		$	46,147		$	—	$	770,150,860
Depreciation		—		1,688,455			43,089,767			5,334			513,055			7,894			—		45,304,505
Disposals		—		(788,342	)		(5,301,373	)		(10,412	)		(169,680	)		—			—		(6,269,807	)
Transfers and reclassifications		—		—			—			—			1,082			(1,924	)		—		(842	)
Exchange effect		—		655			(5,824,014	)		16			(12,552	)		(2,154	)		—		(5,838,049	)
As of December 31, 2020	$	—	$	19,851,288		$	777,687,345		$	42,732		$	5,715,339		$	49,963		$	—	$	803,346,667
Net carrying amount:
As of December 31, 2020	$	1,690,613	$	17,406,222		$	93,881,980		$	12,166		$	1,193,439		$	13,811		$	16,529,296	$	130,727,527

F-51

b. Assets Subject to Operating Leases:

Cost:

	Land			Buildings			Machinery and equipment		Furniture and fixtures		Total
	NT$			NT$			NT$		NT$		NT$
	(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)		(In Thousands)
As of January 1, 2020	$	459,635		$	2,637,271		$	125,413	$	1,315,180	$	4,537,499
Disposals		—			(179,132	)		—		—		(179,132	)
Exchange effect		(13	)		(6,828	)		—		453		(6,388	)
As of December 31, 2020	$	459,622		$	2,451,311		$	125,413	$	1,315,633	$	4,351,979

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment		Furniture and fixtures			Total
	NT$		NT$			NT$		NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)		(In Thousands)			(In Thousands)
As of January 1, 2020	$	—	$	1,019,036		$	125,413	$	1,102,809		$	2,247,258
Depreciation		—		100,454			—		69,425			169,879
Disposals		—		(107,240	)		—		—			(107,240	)
Exchange effect		—		(4,705	)		—		(349	)		(5,054	)
As of December 31, 2020	$	—	$	1,007,545		$	125,413	$	1,171,885		$	2,304,843
Net carrying amount:
As of December 31, 2020	$	459,622	$	1,443,766		$	—	$	143,748		$	2,047,136

F-52

2021

a. Assets Used by the Company:

Cost:

	Land			Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection			Total
	NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	1,690,613		$	37,257,510		$	871,569,325		$	54,898		$	6,908,778		$	63,774		$	16,529,296		$	934,074,194
Additions		—			—			—			—			—			—			38,284,083			38,284,083
Disposals		—			(20,455	)		(3,587,695	)		(791	)		(5,010	)		—			(22,822	)		(3,636,773	)
Transfers and reclassifications		(96,439	)		114,081			35,718,256			2,158			433,504			204			(31,692,267	)		4,479,497
Exchange effect		(102,831	)		(523,656	)		(5,893,187	)		(306	)		(32,098	)		(2,696	)		(242,257	)		(6,797,031	)
As of December 31, 2021	$	1,491,343		$	36,827,480		$	897,806,699		$	55,959		$	7,305,174		$	61,282		$	22,856,033		$	966,403,970

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection		Total
	NT$		NT$			NT$			NT$			NT$			NT$			NT$		NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)
As of January 1, 2021	$	—	$	19,851,288		$	777,687,345		$	42,732		$	5,715,339		$	49,963		$	—	$	803,346,667
Depreciation		—		1,474,241			41,329,061			5,310			531,085			7,247			—		43,346,944
Disposals		—		(20,455	)		(3,580,477	)		(791	)		(5,003	)		—			—		(3,606,726	)
Transfers and reclassifications		—		1,645			125,413			—			—			—			—		127,058
Exchange effect		—		(121,750	)		(4,656,461	)		(143	)		(19,038	)		(2,085	)		—		(4,799,477	)
As of December 31, 2021	$	—	$	21,184,969		$	810,904,881		$	47,108		$	6,222,383		$	55,125		$	—	$	838,414,466
Net carrying amount:
As of December 31, 2021	$	1,491,343	$	15,642,511		$	86,901,818		$	8,851		$	1,082,791		$	6,157		$	22,856,033	$	127,989,504

F-53

b. Assets Subject to Operating Leases:

Cost:

	Land			Buildings			Machinery and equipment			Furniture and fixtures			Total
	NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	459,622		$	2,451,311		$	125,413		$	1,315,633		$	4,351,979
Transfers and reclassifications		96,439			(18,542	)		(125,413	)		—			(47,516	)
Exchange effect		(7,051	)		(10,380	)		—			(2,930	)		(20,361	)
As of December 31, 2021	$	549,010		$	2,422,389		$	—		$	1,312,703		$	4,284,102

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment			Furniture and fixtures			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	—	$	1,007,545		$	125,413		$	1,171,885		$	2,304,843
Depreciation		—		94,130			—			67,347			161,477
Transfers and reclassifications		—		(1,645	)		(125,413	)		—			(127,058	)
Exchange effect		—		(4,917	)		—			(2,442	)		(7,359	)
As of December 31, 2021	$	—	$	1,095,113		$	—		$	1,236,790		$	2,331,903
Net carrying amount:
As of December 31, 2021	$	549,010	$	1,327,276		$	—		$	75,913		$	1,952,199

In order to improve operations, reduce fixed costs and obtain the funds required for the company future operation, the subsidiary of new business segment (NEXPOWER) disposed of its building and facility equipment located in Taichung City in accordance with a resolution of the Board of Directors’ meeting. The Company completed the disposal in the third quarter of 2020 and recorded a gain on disposal of NT$1,081 million in the other operating income and expenses.

Please refer to Note 8 for property, plant and equipment pledged as collateral.

(9) Leases

The Company leases various properties, such as land (including land use right), buildings, machinery and equipment, transportation equipment and other equipment with lease terms of 1 to 30 years, except for the land use rights with lease term of 50 years. Most lease contracts of land located in R.O.C state that lease payments will be adjusted based on the announced land value. The Company does not have purchase options of leased land at the end of the lease terms.

F-54

a. The Company as a lessee

(a) Right-of-use Assets

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Land (including land use right)	$	5,146,342	$	4,877,702
Buildings		352,119		284,011
Machinery and equipment		2,227,035		1,940,084
Transportation equipment		12,252		18,704
Other equipment		10,294		6,344
Net	$	7,748,042	$	7,126,845

	For the years ended December 31,
	2020		2021
	NT$		NT$
Depreciation	(In Thousands)		(In Thousands)
Land (including land use right)	$	333,402	$	325,268
Buildings		120,111		121,373
Machinery and equipment		223,120		210,188
Transportation equipment		8,145		9,858
Other equipment		4,531		4,524
Total	$	689,309	$	671,211

i. For the years ended December 31, 2020 and 2021, the Company’s addition to right-of-use assets amounted to NT$567 million and NT$207 million, respectively.

ii. Please refer to Note 8 for right-of-use assets pledged as collateral.

F-55

(b) Lease Liabilities

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Current	$	550,147	$	557,873
Non-current		5,026,717		4,510,881
Total	$	5,576,864	$	5,068,754

Please refer to Note 6(23) for the interest expenses on the lease liabilities.

b. The Company as a lessor

The Company entered into leases on certain property, plant and equipment which are classified as operating leases as they did not transfer substantially all of the risks and rewards incidental to ownership of the underlying assets. The main contracts are to lease the dormitory to the employees with cancellation clauses. Please refer to Note 6(8) for relevant disclosure of property, plant and equipment for operating leases.

F-56

(10) Intangible Assets

2020

Cost:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2020	$	15,012	$	3,347,148		$	4,183,505		$	3,548,006		$	11,093,671
Additions		—		1,201,288			212,269			862,063			2,275,620
Write-off		—		(312,411	)		(11,023	)		(915,703	)		(1,239,137	)
Reclassifications		—		(3,808	)		—			—			(3,808	)
Exchange effect		—		32,341			145,714			2,886			180,941
As of December 31, 2020	$	15,012	$	4,264,558		$	4,530,465		$	3,497,252		$	12,307,287

Accumulated Amortization and Impairment:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2020	$	7,398	$	951,176		$	2,299,223		$	2,637,627		$	5,895,424
Amortization		—		1,363,607			536,953			810,225			2,710,785
Write-off		—		(312,411	)		(11,023	)		(915,703	)		(1,239,137	)
Reclassifications		—		841			—			—			841
Exchange effect		—		31,815			26,884			2,762			61,461
As of December 31, 2020	$	7,398	$	2,035,028		$	2,852,037		$	2,534,911		$	7,429,374
Net carrying amount: As of December 31, 2020	$	7,614	$	2,229,530		$	1,678,428		$	962,341		$	4,877,913

F-57

2021

Cost:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	15,012	$	4,264,558		$	4,530,465		$	3,497,252		$	12,307,287
Additions		—		1,333,882			56,331			330,976			1,721,189
Write-off		—		(587,102	)		—			(458,295	)		(1,045,397	)
Reclassifications		—		(758	)		—			—			(758	)
Exchange effect		—		(165,543	)		(95,632	)		(21,862	)		(283,037	)
As of December 31, 2021	$	15,012	$	4,845,037		$	4,491,164		$	3,348,071		$	12,699,284

Accumulated Amortization and Impairment:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	7,398	$	2,035,028		$	2,852,037		$	2,534,911		$	7,429,374
Amortization		—		1,566,948			538,874			747,617			2,853,439
Write-off		—		(587,102	)		—			(458,295	)		(1,045,397	)
Exchange effect		—		(101,050	)		(66,244	)		(15,771	)		(183,065	)
As of December 31, 2021	$	7,398	$	2,913,824		$	3,324,667		$	2,808,462		$	9,054,351
Net carrying amount: As of December 31, 2021	$	7,614	$	1,931,213		$	1,166,497		$	539,609		$	3,644,933

F-58

The amortization amounts of intangible assets were as follows:

	For the years ended December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Operating costs	$	866,497	$	798,011
Operating expenses	$	1,844,288	$	2,055,428

(11) Short-Term Loans

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Unsecured bank loans	$	11,057,132	$	1,924,124

	For the years ended December 31,
	2019	2020	2021
Interest rates applied	0.00%-4.55%	0.00%-4.05%	0.15%-3.60%

The Company’s unused short-term lines of credit amounted to NT$63,177 million and NT$72,743 million as of December 31, 2020 and 2021, respectively.

(12) Financial Liabilities at Fair Value through Profit or Loss, Current

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Embedded derivatives in exchangeable bonds	$	—	$	2,380,599
Forward contracts		2,326		—
Total	$	2,326	$	2,380,599

F-59

(13) Bonds Payable

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured domestic bonds payable	$	18,700,000		$	31,300,000
Unsecured exchangeable bonds payable		—			10,817,047
Less: Discounts on bonds payable		(9,616	)		(1,580,389	)
Total		18,690,384			40,536,658
Less: Current or exchangeable portion due within one year		(1,999,910	)		(17,458,959	)
Net	$	16,690,474		$	23,077,699

a. UMC issued domestic unsecured corporate bonds. The terms and conditions of the bonds are as follows:

Term	Issuance date	Issued amount	Coupon rate		Repayment
Seven-year	In mid-March 2013	NT$2,500 million		1.50%	Interest was paid annually and the principal was fully repaid in March 2020.
Seven-year	In mid-June 2014	NT$2,000 million		1.70%	Interest was paid annually and the principal was fully repaid in June 2021.
Ten-year	In mid-June 2014	NT$3,000 million		1.95%	Interest will be paid annually and the principal will be repayable in June 2024 upon maturity.
Five-year	In late March 2017	NT$6,200 million		1.15%	Interest will be paid annually and the principal will be repayable in March 2022 upon maturity.
Seven-year	In late March 2017	NT$2,100 million		1.43%	Interest will be paid annually and the principal will be repayable in March 2024 upon maturity.
Five-year	In early October 2017	NT$2,000 million		0.94%	Interest will be paid annually and the principal will be repayable in October 2022 upon maturity.

F-60

Term	Issuance date	Issued amount	Coupon rate		Repayment
Seven-year	In early October 2017	NT$3,400 million		1.13%	Interest will be paid annually and the principal will be repayable in October 2024 upon maturity.
Five-year	In late April 2021	NT$5,500 million		0.57%	Interest will be paid annually and the principal will be repayable in April 2026 upon maturity.
Seven-year	In late April 2021	NT$2,000 million		0.63%	Interest will be paid annually and the principal will be repayable in April 2028 upon maturity.
Ten-year (green bond)	In late April 2021	NT$2,100 million		0.68%	Interest will be paid annually and the principal will be repayable in April 2031 upon maturity.
Five-year	In mid-December 2021	NT$5,000 million		0.63%	Interest will be paid annually and the principal will be repayable in December 2026 upon maturity.

b. On May 18, 2015, UMC issued SGX-ST listed currency linked zero coupon convertible bonds. In accordance with IAS 32 “Financial Instruments Presentation”, the value of the conversion right of the convertible bonds was determined at issuance and recognized in additional paid-in capital-stock options amounting to NT$1,894 million, after reduction of issuance costs amounting to NT$9 million. The effective interest rate on the liability component of the convertible bonds was determined to be 2.03%. The terms and conditions of the bonds are as follows:

i. Issue Amount: US$600 million

ii. Period: May 18, 2015 - May 18, 2020 (Maturity date)

iii. Redemption:

(i) UMC may redeem the bonds, in whole or in part, after 3 years of the issuance and prior to the maturity date, at the principal amount of the bonds with an interest calculated at the rate of -0.25% per annum (the Early Redemption Amount) if the closing price of the ordinary shares of UMC on the TWSE, for a period of 20 out of 30 consecutive trading days, the last of which occurs not more than 5 days prior to the date upon which notice of such redemption is published, is at least 125% of the conversion price. The Early Redemption Price will be converted into NTD based on the Fixed Exchange Rate (NTD 30.708=USD 1.00), and this fixed NTD amount will be converted using the prevailing rate at the time of redemption for payment in USD.

F-61

(ii) UMC may redeem the bonds, in whole, but not in part, at the Early Redemption Amount if at least 90% in principal amount of the bonds has already been converted, redeemed or repurchased and cancelled.

(iii) UMC may redeem all, but not part, of the bonds, at the Early Redemption Amount at any time, in the event of certain changes in the R.O.C.’s tax rules which would require UMC to gross up for payments of principal, or to gross up for payments of interest or premium.

(iv) All or any portion of the bonds will be redeemable at Early Redemption Amount at the option of bondholders on May 18, 2018 at 99.25% of the principal amount.

(v) Bondholders have the right to require UMC to redeem all of the bonds at the Early Redemption Amount if UMC’s ordinary shares cease to be listed on the Taiwan Stock Exchange.

(vi) In the event that a change of control as defined in the indenture of the bonds occurs to UMC, the bondholders shall have the right to require UMC to redeem the bonds, in whole but not in part, at the Early Redemption Amount.

iv. Terms of Conversion:

(i) Underlying Securities: Ordinary shares of UMC

(ii) Conversion Period: The bonds are convertible at any time on or after June 28, 2015 and prior to May 8, 2020, into UMC ordinary shares; provided, however, that if the exercise date falls within 5 business days from the beginning of, and during, any closed period, the right of the converting holder of the bonds to vote with respect to the shares it receives will be subject to certain restrictions.

(iii) Conversion Price and Adjustment: The conversion price was originally NT$17.50 per share. The conversion price will be subject to adjustments upon the occurrence of certain events set out in the indenture.

v. Conversion of Bonds:

The last conversion date of the bonds was on March 31, 2020. For the years ended December 31, 2019 and 2020, the outstanding principal amount of the convertible bonds totaling US$15 million and US$215 million had been converted into 33 million shares and 465 million shares, respectively.

F-62

Upon the maturity date of May 18, 2020, UMC fully redeemed the remaining unconverted bonds at 98.76% of the principal amount. The principal amount of redemption amounted to US$369 million. UMC reclassified cancelled convertible rights of NT$1,166 million from additional paid in capital-stock options to additional paid in capital-others.

c. On July 7, 2021, UMC issued SGX-ST listed currency linked zero coupon exchangeable bonds. In accordance with IFRS 9, the value of the exchange right, call option and put option (together referred to as Option) of the exchangeable bonds was separated from the host and accounted for as “financial liabilities at fair value through profit or loss, current”. The effective rate of the host bond was 3.49%. The terms and conditions of the bonds are as follows:

i. Issue Amount: US$400 million

ii. Period: July 7, 2021 - July 7, 2026 (Maturity Date)

iii. Redemption:

UMC may, at its option, redeem in whole or in part at the principal amount of the bonds with an interest calculated at the rate of -0.625% per annum (the Early Redemption Amount) at any time after the third anniversary from the issue date and prior to the Maturity Date, if the closing price of the common shares of Novatek Microelectronics Corporation (“Novatek”) on the Taiwan Stock Exchange (the “TWSE”), converted into U.S. dollars at the prevailing exchange rate, for 20 out of 30 consecutive trading days prior to the publication of the redemption notice is at least 130% of the quotient of the Early Redemption Amount multiplied by the then exchange price (converted into U.S. dollars at the Fixed Exchange Rate), divided by the principal amount of the bonds.

(i) The Early Redemption Amount will be converted into NTD based on the Fixed Exchange Rate (NTD 27.902=USD 1.00), and this fixed NTD amount will then be converted using the prevailing exchange at the time of redemption for payment in USD.

(ii) UMC may redeem the outstanding bonds in whole, but not in part, at the Early Redemption Amount, in the event that over 90% of the bonds have been previously redeemed, repurchased and cancelled or exchanged.

(iii) In the event of any change in ROC taxation resulting in increase of tax obligation or the necessity to pay additional interest expense or increase of additional costs to UMC, UMC may redeem the outstanding bonds in whole, but not in part, at the Early Redemption Amount. Bondholders may elect not to have their bonds redeemed but with no entitlement to any additional amounts or reimbursement of additional taxes.

(iv) All or any portion of the bonds will be redeemable at put price at the option of bondholders on July 7, 2024 at 98.14% of the principal amount.

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(v) In the event that the common shares of Novatek cease to be listed or are suspended from trading for a period equal to or exceeding 30 consecutive trading days on the TWSE, each bondholder shall have the right to require UMC to redeem the bonds, in whole but not in part, at the Early Redemption Amount.

(vi) Upon the occurrence of a change of control (as defined in the indenture) of UMC, each bondholder shall have the right to require UMC to redeem the bonds, in whole but not in part, at the Early Redemption Amount.

iv. Terms of Exchange:

(i) Underlying Securities: Common Shares of Novatek

(ii) Exchange Period: The bonds are exchangeable at any time on or after October 8, 2021 and prior to June 27, 2026, into Novatek common shares. If for any reason UMC does not have sufficient Novatek common shares to deliver upon the exchange of any bond, then, UMC will pay to the exchanging bondholder an amount in U.S. dollars equal to the product of the volume-weighted average closing price per Novatek common share on the TWSE for five consecutive trading days starting from and including the applicable exercise date (as defined in the indenture) (or such fewer number of trading days as are available within ten days starting from and including the applicable exercise date) each converted into USD at the prevailing rate on the day preceding the applicable trading day and the number of Novatck common shares that UMC is unable to deliver. Provided, however, that if the exercise date falls within 5 business days from the beginning of, and during, any closed period, the right of the converting holder of the bonds to vote with respect to the shares it receives will be subject to certain restrictions.

(iii) Exchange Price and Adjustment: The exchange price was originally NT$731.25 per Novatek common share. The exchange price will be subject to adjustments upon the occurrence of certain events set out in the indenture. The exchange price was NT$709.2 per Novatek common share on December 31, 2021.

v. Redemption on the Maturity Date:

The bonds will be redeemed with 96.92% principal amount on the maturity date unless:

(i) UMC shall have redeemed the bonds at the option of UMC, or the bonds shall have been redeemed at option of the bondholder;

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(ii) The bondholders shall have exercised the exchange right before maturity; or

(iii) The bonds shall have been redeemed or repurchased by UMC and cancelled.

(14) Long-Term Loans

a. Details of long-term loans as of December 31, 2020 and 2021 were as follows:

	As of December 31,
Lenders	2020		2021		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Long-Term Loan from Mega International Commercial Bank (1)	$	1,640	$	—	Repayable quarterly from July 3, 2017 to July 5, 2021 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Mega International Commercial Bank (2)		19,464		14,598	Repayable quarterly from October 24, 2019 to October 24, 2024 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (1)		59,459		47,568	Repayable quarterly from October 19, 2015 to October 19, 2025 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (2)		21,146		13,125	Repayable monthly from May 31, 2019 to May 31, 2023 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (3)		56,000		44,000	Repayable monthly from August 13, 2020 to August 13, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (4)		28,965		22,759	Repayable monthly from October 29, 2020 to August 29, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (5)		—		101,000	Repayable monthly from April 15, 2021 to April 15, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Syndicated Loans from China Development Bank and 6 others (1) (Note A)		22,236,343		18,158,940	Repayable semi-annually from October 20, 2016 to October 20, 2024 with semi-annually interest payments. Interest-only payment for the first and the second year.

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	As of December 31,
Lenders	2020		2021		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Syndicated Loans from China Development Bank and 6 others (2)		—		12,236,000	Repayable semi-annually from March 19, 2021 to March 18, 2031 with semi-annually interest payments. Interest-only payment for the first and the second year.
Secured Long-Term Loan from First Commercial Bank		—		47,000	Repayable monthly from December 2, 2021 to December 2, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from KGI Bank		—		21,000	Repayable semi-annually from December 27, 2021 to December 27, 2026 with monthly interest payments. Interest-only payment for the first and the second year.
Unsecured Long-Term Loan from ICBC Bank		1,702,589		—	Repayable semi-annually from September 20, 2019 to September 9, 2021 with quarterly interest payments. Interest-only payment for the first semi-annually year.
Unsecured Long-Term Loan from Xiamen Bank		440,500		436,126	Repayable semi-annually from November 24, 2020 to May 24, 2022 of RMB 0.1 million with monthly interest payments and the remaining principal will be repaid once at maturity. Interest-only payment for the first semi-annually year.
Unsecured Long-Term Loan from Bank of China		—		982,791	Repayable semi-annually from June 24, 2023 to June 24, 2026 with quarterly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan (1)		2,000,000		500,000	Repayable quarterly from March 10, 2022 to December 10, 2024 with monthly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan (2)		—		450,000	Repayable quarterly from March 24, 2023 to March 24, 2025 with monthly interest payments.
Unsecured Long-Term Loan from Taiwan Cooperative Bank		2,000,000		—	Repayable quarterly from May 5, 2023 to May 5, 2025 with monthly interest payments.
Unsecured Revolving Loan from Mega International Commercial Bank (Note B)		1,500,000		500,000	Repayable semi-annually from October 16, 2020 to April 16, 2022 with monthly interest payments.
Unsecured Revolving Loan from Taipei Fubon Bank (Note C)		700,000		200,000	Repayable annually from August 9, 2020 to August 9, 2023 with monthly interest payments.
Unsecured Revolving Loan from Chang Hwa Commercial Bank (Note D)		1,000,000		550,000	Repayable quarterly from January 27, 2021 to October 27, 2022 with monthly interest payments.
Unsecured Revolving Loan from KGI Bank (1) (Note E)		1,000,000		—	Repayable annually from December 11, 2021 to December 11, 2023 with monthly interest payments.
Unsecured Revolving Loan from KGI Bank (2) (Note E )		—		500,000	Repayable annually from August 10, 2023 to August 10, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (1) (Note F)		300,000		—	Settlement due on May 15, 2025 with monthly interest payments.

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	As of December 31,
Lenders	2020			2021			Redemption
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured Revolving Loan from First Commercial Bank (2) (Note G)		—			300,000		Settlement due on February 25, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (3) (Note G)		—			300,000		Settlement due on March 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (4) (Note G)		—			200,000		Settlement due on June 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from Yuanta Commercial Bank (Note H)		—			1,000,000		Repayable annually from March 2, 2023 to March 2, 2026 with monthly interest payments.
Subtotal		33,066,106			36,624,907
Less: Current portion		(24,985,168	)		(19,873,011	)
Total	$	8,080,938		$	16,751,896

	For the years ended December 31,
	2019		2020		2021
Interest rates applied		0.55%-5.56%		0.84%-4.67%		0.85%-4.66%

Note A: USCXM, the subsidiary of UMC failed to comply with the loan covenant to maintain its financial ratio at certain level and therefore the loan is reclassified to current liabilities as of December 31, 2020 and 2021. The bank exemption of 2020 and 2021 have been obtained as of April 21, 2021 and February 7, 2022, respectively.

Note B: UMC entered into a 5-year loan agreement with Mega International Commercial Bank, effective from October 17, 2016. The agreement offered UMC a revolving line of credit of NT$3 billion. This line of credit will be reduced starting from the end of the two years and six months after the first use and every six months thereafter, with a total of six adjustments. The expiration date of the agreement is April 16, 2022. As of December 31, 2020 and 2021, the line of credit were fully utilized.

Note C: UMC entered into a 5-year loan agreement with Taipei Fubon Bank, effective from February 9, 2018. The agreement offered UMC a revolving line of credit of NT$2 billion. This line of credit will be reduced starting from the end of the two years after the first use and every twelve months thereafter, with a total of four adjustments. The expiration date of the agreement is August 9, 2023. As of December 31, 2020 and 2021, the unused line of credit were both NT$0.8 billion.

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Note D: UMC entered into a 5-year loan agreement with Chang Hwa Commercial Bank, effective from November 2, 2016. The agreement offered UMC a revolving line of credit of NT$3 billion. This line of credit will be reduced starting from the end of the third year after the first use and every three months thereafter, with a total of nine adjustments. The expiration date of the agreement is October 27, 2022. As of December 31, 2020 and 2021, the unused line of credit were NT$1.7 billion and NT$0.8 billion, respectively.

Note E: UMC entered into a 5-year loan agreement with KGI Commercial Bank, effective from September 11, 2018. The agreement offered UMC a revolving line of credit of NT$2.5 billion which has been modified into NT$3 billion as of May 10, 2021. This line of credit will be reduced starting from the end of the second year after the first use and every twelve months thereafter, with a total of four adjustments. The expiration date of the agreement is August 10, 2026. As of December 31, 2020 and 2021, the unused line of credit were NT$1 billion and NT$2.5 billion, respectively.

Note F: First Commercial Bank approved the 1-year credit loan on December 30, 2019, which has expired on December 30, 2020.

Note G: First Commercial Bank approved the 1-year credit loan on January 18, 2021, which offered UMC a revolving line of credit of NT$2 billion starting from the approval date to January 17, 2022. As of December 31, 2021, the unused line of credit was NT$1.2 billion.

Note H: UMC entered into a 5-year loan agreement with Yuanta Commercial Bank, effective from March 3, 2021. The agreement offered UMC a revolving line of credit of NT$4 billion. This line of credit will be reduced starting from the end of the second year after the contract date and every twelve months thereafter, with a total of four adjustments. The expiration date of the agreement is March 2, 2026. As of December 31, 2021, the unused line of credit was NT$3 billion.

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b. Please refer to Note 8 for property, plant and equipment and right-of-use assets pledged as collateral for long- term loans.

c. In 2016, HJ resolved to provide endorsement for USCXM’s syndicated loan from banks including China Development Bank. The maximum balance for the years ended December 31, 2020 and 2021 were NT$8,362 million and NT$7,450 million, respectively. As of December 31, 2020 and 2021, the actual amount provided were NT$4,564 million and NT$6,438 million, respectively.

d. In 2017, UMC resolved to provide endorsement for USCXM’s syndicated loan from banks including China Development Bank. The maximum balance for the years ended December 31, 2020 and 2021 were US$371 million/RMB¥1.97 billion and US$290 million/RMB¥2.05 billion, respectively. As of December 31, 2020 and 2021, the actual amount provided were NT$10,350 million and NT$14,566 million, respectively.

(15) Post-Employment Benefits

a. Defined contribution plan

The employee pension plan under the Labor Pension Act of the R.O.C. is a defined contribution plan. Pursuant to the plan, UMC and its domestic subsidiaries make monthly contributions of 6% based on each individual employee’s salary or wage to employees’ pension accounts. Pension benefits for employees of the Singapore branch and subsidiaries overseas are provided in accordance with the local regulations. Total pension expenses of NT$1,369 million, NT$1,478 million and NT$1,636 million were contributed by the Company for the years ended December 31, 2019, 2020 and 2021, respectively.

b. Defined benefit plan

The employee pension plan mandated by the Labor Standards Act of the R.O.C. is a defined benefit plan. The pension benefits are disbursed based on the units of service years and average monthly salary prior to retirement according to the Labor Standards Act. Two units per year are awarded for the first 15 years of services while one unit per year is awarded after the completion of the 15th year and the total units will not exceed 45 units. The Company contributes an amount equivalent to 2% of the employees’ total salaries and wages on a monthly basis to the pension fund deposited with the Bank of Taiwan under the name of a pension fund supervisory committee. The pension fund is managed by the government’s designated authorities and therefore is not included in the Company’s consolidated financial statements. For the years ended December 31, 2019, 2020 and 2021, total pension expenses of NT$59 million, NT$40 million and NT$23 million, respectively, were recognized by the Company.

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i. Movements in present value of defined benefit obligation during the year:

	For the years ended December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Defined benefit obligation at beginning of year	$	(5,411,069	)	$	(5,561,999	)
Items recognized as profit or loss:
Service cost		(13,090	)		(11,009	)
Interest cost		(36,254	)		(16,130	)
Subtotal		(49,344	)		(27,139	)
Remeasurements recognized in other comprehensive income (loss):
Arising from changes in demographic assumptions		—			(4,537	)
Arising from changes in financial assumptions		(173,615	)		(123,140	)
Experience adjustments		(70,461	)		(91,268	)
Subtotal		(244,076	)		(218,945	)
Benefits paid		142,490			349,750
Defined benefit obligation at end of year	$	(5,561,999	)	$	(5,458,333	)

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ii. Movements in fair value of plan assets during the year:

	For the years ended December 31,
	2020			2021
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance of fair value of plan assets	$	1,385,696		$	1,399,345
Items recognized as profit or loss:
Interest income on plan assets		9,284			4,059
Contribution by employer		95,360			505,890
Benefits paid		(142,490	)		(349,750	)
Remeasurements recognized in other comprehensive income (loss):
Return on plan assets, excluding amounts included in interest income		51,495			21,468
Fair value of plan assets at end of year	$	1,399,345		$	1,581,012

The actual returns on plan assets of the Company for the years ended December 31, 2020 and 2021 were NT$61 million and NT$26 million, respectively.

iii. The defined benefit plan recognized on the consolidated balance sheets were as follows:

	As of December 31,
	2020			2021
	NT$ (In Thousands)			NT$ (In Thousands)
Present value of the defined benefit obligation	$	(5,561,999	)	$	(5,458,333	)
Fair value of plan assets		1,399,345			1,581,012
Funded status		(4,162,654	)		(3,877,321	)
Net defined benefit liabilities, noncurrent recognized on the consolidated balance sheets	$	(4,162,654	)	$	(3,877,321	)

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iv. The major categories of plan assets as a percentage of the fair value of the total plan assets are as follows:

	As of December 31,
	2020			2021
Cash		16	%		24	%
Equity instruments		48	%		43	%
Debt instruments		25	%		23	%
Others		11	%		10	%

Employee pension fund is deposited under a trust administered by the Bank of Taiwan. The overall expected rate of return on assets is determined based on historical trend and actuaries’ expectations on the assets’ returns in the market over the obligation period. Furthermore, the utilization of the fund is determined by the labor pension fund supervisory committee, which also guarantees the minimum earnings to be no less than the earnings attainable from interest rates offered by local banks for two-year time deposits.

v. The principal underlying actuarial assumptions are as follows:

	As of December 31,
	2020			2021
Discount rate		0.29	%		0.62	%
Rate of future salary increase		3.50	%		4.25	%

vi. Expected future benefit payments are as follows:

Year	As of December 31, 2021
	NT$ (In Thousands)
2022	$	373,879
2023		373,406
2024		397,426
2025		432,167
2026		435,179
2027 and thereafter		3,721,746
Total	$	5,733,803

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The Company expects to make pension fund contribution of NT$697 million in 2022. The weighted-average durations of the defined benefit obligation were 9 years and 8 years as of December 31, 2020 and 2021, respectively.

vii. Sensitivity analysis:

	As of December 31, 2020
	Discount rate				Rate of future salary increase
	0.5% increase		0.5% decrease		0.5% increase			0.5% decrease
	NT$ (In Thousands)		NT$ (In Thousands)		NT$ (In Thousands)			NT$ (In Thousands)
Decrease (increase) in defined benefit obligation	$	226,798	$	—	$	(204,390	)	$	195,078

	As of December 31, 2021
	Discount rate					Rate of future salary increase
	0.5% increase		0.5% decrease			0.5% increase			0.5% decrease
	NT$ (In Thousands)		NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)
Decrease (increase) in defined benefit obligation	$	207,999	$	(220,561	)	$	(184,551	)	$	176,567

The sensitivity analyses above have been determined based on a method that extrapolates the impact on the net defined benefit obligation as a result of reasonable changes in key assumptions occurring at the end of the reporting period.

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(16) Deferred Government Grants

	As of December 31,
	2020			2021
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance	$	13,551,553		$	10,207,109
Arising during the period		578,844			2,498,990
Recorded in profit or loss:
Other operating income		(3,994,818	)		(4,069,055	)
Exchange effect		71,530			(93,246	)
Ending balance	$	10,207,109		$	8,543,798
Current (classified under other current liabilities)	$	3,836,211		$	4,096,742
Non-current (classified under other noncurrent liabilities)		6,370,898			4,447,056
Total	$	10,207,109		$	8,543,798

The significant government grants related to equipment acquisitions received by the Company are amortized as income over the useful lives of related equipment and recorded in the net other operating income and expenses.

(17) Refund Liabilities (classified under other current liabilities)

	As of December 31,
	2020		2021
	NT$ (In Thousands)		NT$ (In Thousands)
Refund liabilities	$	1,252,451	$	724,207

(18) Equity

a. Capital stock:

i. UMC had 26,000 million common shares authorized to be issued as of December 31, 2020 and 2021, of which 12,422 million shares and 12,483 million shares were issued as of December 31, 2020 and 2021, respectively, each at a par value of NT$10.

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ii. UMC had 127 million and 149 million ADSs, which were traded on the NYSE as of December 31, 2020 and 2021, respectively. The total number of common shares of UMC represented by all issued ADSs were 636 million shares and 746 million shares as of December 31, 2020 and 2021, respectively. One ADS represents five common shares.

iii. Please refer to Note 6(13) for the Company’s conversion of unsecured convertible bonds into ordinary shares of UMC for the year ended December 31, 2020.

iv. On September 1, 2020 and June 9, 2021, UMC issued restricted stocks for its employees in a total of 200 million shares and 1 million shares with a par value of NT$10 each, respectively. The aforementioned issuance of new shares was approved by the competent authority and the registration was completed. Please refer to Note 6(19) for the information of restricted stocks.

v. As of December 31, 2021, UMC has recalled and cancelled 2 million shares of restricted stocks issued for employees according to the issuance plan. The aforementioned reduction of capital was approved by the competent authority and the registration was completed.

vi. On September 3, 2021, the Board of Directors’ meeting approved the share exchange transaction with CHIPBOND. UMC issued 61 million common shares with a par value of NT$10 and obtained 53 million common shares newly issued by CHIPBOND. The aforementioned issuance of new shares was approved by the competent authority and the change in share registration was completed. The share exchanged date was November 5, 2021. Please refer to Note 6(3) for further information.

b. Treasury stock:

i. UMC carried out a treasury stock program and repurchased its shares from the centralized securities exchange market. The purpose for the repurchase and changes in treasury stock during the years ended December 31, 2020 and 2021 were as follows:

For the year ended December 31, 2020

(In thousands of shares)

Purpose	As of January 1, 2020		Increase		Decrease		As of December 31, 2020
For transfer to employees		—		105,000		105,000		—

For the year ended December 31, 2021: None.

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ii. According to the Securities and Exchange Law of the R.O.C., the total shares of treasury stock shall not exceed 10% of UMC’s issued stock, and the total purchase amount shall not exceed the sum of the retained earnings, additional paid-in capital-premiums and realized additional paid-in capital. As of December 31, 2020 and 2021, the treasury stock held by UMC did not exceed the threshold.

iii. In compliance with Securities and Exchange Law of the R.O.C., treasury stock held by the parent company should not be pledged, nor should it be entitled to voting rights or receiving dividends. Stock held by subsidiaries and associates is treated as treasury stock. According to the Company Act of R.O.C., these subsidiaries have the same rights as other shareholders except for subscription to new stock issuance and voting rights.

iv. As of December 31, 2020, UMC’s subsidiary, FORTUNE VENTURE CAPITAL CORP. (FORTUNE), held 16 million shares of UMC’s stock and FORTUNE measured UMC’s stock as financial assets at fair value through other comprehensive income. On September 3, 2021, the share exchange transaction with CHIPBOND was approved by FORTUNE’s Board of Directors’ meeting. The 16 million shares of UMC held by FORTUNE were exchanged for 14 million common shares newly issued by CHIPBOND. As of December 31, 2020 and 2021, UMC’s associate, HSUN CHIEH INVESTMENT CO., LTD. (HSUN CHIEH), held 441 million shares of UMC’s stock and UMC’s associate, YANN YUAN INVESTMENT CO., LTD. (YANN YUAN), held 201 million and 160 million shares of UMC’s stock, respectively. HSUN CHIEH measured UMC’s stock as financial assets at fair value through profit or loss while YANN YUAN measured UMC’s stock as financial assets at fair value through other comprehensive income. The closing prices of UMC’s stock on December 31, 2020 and 2021 were NT$47.15 and NT$65.00, respectively.

c. Retained earnings and dividend policies:

According to UMC’s Articles of Incorporation, current year’s earnings, if any, shall be distributed in the following order :

i. Payment of taxes.

ii. Making up loss for preceding years.

iii. Setting aside 10% for legal reserve, except for when accumulated legal reserve has reached UMC’s paid-in capital.

iv. Appropriating or reversing special reserve by government officials or other regulations.

v. The remaining, if applicable, may be distributed preferentially as preferred shares dividends for the current year, and if there is still a remaining balance, in addition to the previous year’s unappropriated earnings, UMC shall distribute it according to the distribution plan proposed by the Board of Directors according to the dividend policy and submitted to the shareholders’ meeting for approval.

 

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Because UMC conducts business in a capital intensive industry and continues to operate in its growth phase, the dividend policy of UMC shall be determined pursuant to factors such as the investment environment, its funding requirements, domestic and overseas competitive landscape and its capital expenditure forecast, as well as shareholders’ interest, balancing dividends and UMC’s long-term financial planning. The Board of Directors shall propose the distribution plan and submit it to the shareholders’ meeting every year. The distribution of shareholders’ dividend shall be allocated as cash dividend in the range of 20% to 100%, and stock dividend in the range of 0% to 80%.

According to the regulations of Taiwan Financial Supervisory Commission (FSC), UMC is required to appropriate a special reserve in the amount equal to the sum of debit elements under equity, such as unrealized loss on financial instruments and debit balance of exchange differences on translation of foreign operations, at every year-end. Such special reserve is prohibited from distribution. However, if any of the debit elements is reversed, the special reserve in the amount equal to the reversal may be released for earnings distribution or offsetting accumulated deficits.

The appropriation of earnings for 2020 was approved by the shareholders’ meeting held on July 7, 2021, while the appropriation of earnings for 2021 was proposed by the Board of Directors’ meeting on February 24, 2022. The details of appropriation were as follows:

	Appropriation of earnings (in thousand NT dollars)						Cash dividend per share (NT dollars)
	2020			2021			2020		2021
Legal reserve	$	3,197,890		$	5,832,570
Special reserve		(2,857,666	)		(3,250,434	)
Cash dividends		19,875,842			—		$	1.60	$	—

In addition, the Board of Directors’ meeting held on February 24, 2022 proposed to distribute cash from additional paid-in capital of NT$37,446 million, at approximately NT$3.00 per share.

The aforementioned 2020 appropriation approved by shareholders’ meeting was consistent with the resolutions of the Board of Directors’ meeting held on February 24, 2021.

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The cash dividend per share for 2020 was adjusted to NT$1.59988820 per share. The adjustment was due to the net increase of outstanding common shares from cancellation and issuance of the restricted stocks.

The appropriation of 2021 unappropriated retained earnings has not yet been approved by the shareholders’ meeting as of the reporting date. Information relevant to the Board of Directors’ meeting resolutions and shareholders’ meeting approval can be obtained from the “Market Observation Post System” on the website of the TWSE.

Please refer to Note 6(21) for information on the employees and directors’ compensation.

d. Non-controlling interests:

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Beginning balance	$	466,768		$	410,065		$	113,356
Attributable to non-controlling interests:
Net loss		(3,578,847	)		(2,009,077	)		(668,245	)
Other comprehensive income (loss)		(15,213	)		126,653			(19	)
Disposal of subsidiaries		—			(51,565	)		—
The differences between the fair value of the consideration paid or received from acquiring or disposing subsidiaries and the carrying amounts of the subsidiaries		—			106,879			—
Changes in subsidiaries’ ownership		24,740			(10,331	)		(11,126	)
Non-controlling interests		—			(551,608	)		23,430
Derecognition of the non-controlling interests		3,512,617			2,092,340			765,785
Ending balance	$	410,065		$	113,356		$	223,181

F-78

(19) Share-Based Payment

a. Treasury stock plan for employees

In August 2018, the Company executed a compensation plan to offer 200 million shares of treasury stock to qualified employees of UMC. The compensation cost for the share-based payment was measured at fair value, having recognized in expense the difference between the closing quoted market price of the shares at the grant date and the cash received from employees. The closing quoted market price of the Company’s shares on the grant date was NT$16.95 per share. For the stocks vested on the date of grant, the Company recognized the entire compensation cost once granted, whereas for the stocks with requisite service conditions to vest at the end of one or two years from the date of grant, the Company recognizes the compensation cost over the vesting period in which the services conditions are fulfilled, together with a corresponding increase in equity. The compensation plan had expired in September 2020. For the years ended December 31, 2019 and 2020, the compensation cost of NT$366 million and NT$107 million, respectively, were recognized in expenses by the Company.

In September 2020, the Company executed a compensation plan to offer 105 million shares of treasury stock to qualified employees of the Company. The compensation cost for the share-based payment was measured at fair value, having recognized in expense the difference between the closing quoted market price of the shares at the grant date and the cash received from employees. The closing quoted market price of the Company’s shares on the grant date was NT$21.45 per share. For the stocks vested on the date of grant, the Company recognized the entire compensation cost once granted, whereas for the stocks with requisite service conditions to vest at the end of one year from the date of grant, the Company recognizes the compensation cost over the period in which the services conditions are fulfilled, together with a corresponding increase in equity. The compensation plan had expired in September 2021. For the years ended December 31, 2020 and 2021, the compensation costs of NT$348 million and NT$226 million, respectively, were recognized in expenses by the Company.

b. Restricted stock plan for employees

On June 10, 2020, the shareholders approved a compensation plan in their meeting to issue restricted stocks to qualified employees of UMC without consideration. The maximum shares to be issued are 233 million common shares. The Company is authorized to issue restricted stocks in one tranche or in installments, under the custody of trust institution, within one year from the date of receiving the effective registration from the competent authority.

F-79

The issuance plan was authorized for effective registration by the Securities and Futures Bureau of the FSC and accordingly, 200 million shares and 1 million shares of restricted stock for employees were issued without consideration on September 1, 2020 and June 9, 2021, respectively. The life of the plan is four years. Beginning from the end of two years since the date of grant, those employees who fulfill both service period and performance conditions set by the Company are gradually eligible to the vested restricted stocks at certain percentage and time frame. For those employees who fail to fulfill the vesting conditions, the Company will recall and cancel their stocks without consideration. During the vesting period, the restricted stock holders are entitled the same rights as those of common stock holders including the right to receive dividends, but are restricted to sell, pledge, set guarantee, transfer, grant, or dispose the restricted stocks in any other ways. Related information can be obtained from the “Market Observation Post System” on the website of the TWSE.

The aforementioned compensation costs for the equity-settled share-based payment were measured at fair value based on the closing quoted market price of the shares on the grant date, NT$21.8 and NT$53.0 per share, respectively. The unvested restricted stocks issued on the grant date for employees are recognized in unearned employee compensation as a transitional contra equity account and such account shall be amortized as compensation expense over the vesting period. For the years ended December 31, 2020 and 2021, the compensation costs of NT$504 million and NT$1,520 million, respectively, were recognized in expenses by the Company.

c. Stock appreciation right plan for employees

In September 2020 and June 2021, the Company executed a compensation plan to grant 26 million units and 1 million units of cash-settled stock appreciation right to qualified employees of the Company without consideration, respectively. One unit of stock appreciation right to employees represents a right to the intrinsic value of one common share of UMC. The life of the plan is four years. Beginning from the end of two years since the date of grant, those employees who fulfill both service period and performance conditions set by the Company are gradually eligible to the vested stock appreciation right at certain percentage and time frame. For those employees who fail to fulfill the vesting conditions, the Company will withdraw their rights without consideration. During the vesting period, the holders of the stock appreciation right are not entitled the same rights as those of common stock holders of UMC.

F-80

The compensation cost for the cash-settled share-based payment was measured at fair value on the grant date by using Black-Scholes Option Pricing Model and will be remeasured at the end of each reporting period until settlement. As of December 31, 2021, the assumptions used are as below:

	Granted in September 2020		Granted in June 2021
Share price of measurement date (NT$/ per share)	$	65.00	$	65.00
Expected volatility		40.11%-42.88%		38.52%-47.75%
Expected life		0.67-2.67 years		1.44-3.44 years
Expected dividend yield		5.27%		5.27%
Risk-free interest rate		0.32%-0.46%		0.38%-0.50%

For the years ended December 31, 2020 and 2021, the compensation costs of NT$80 million and NT$271 million, respectively, were recognized in expenses by the Company. As of December 31, 2020 and 2021, the liabilities for stock appreciation right recognized which were classified under other payables and other noncurrent liabilities amounted to NT$81 million and NT$352 million, respectively. The intrinsic value for the liabilities of vested rights were both nil.

(20) Operating Revenues

a. Disaggregation of revenue

i. By product

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Wafer	$	142,625,019	$	169,885,201	$	204,594,399
Others		5,576,622		6,935,713		8,416,619
Total	$	148,201,641	$	176,820,914	$	213,011,018

F-81

ii. By geography 

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Taiwan	$	53,966,435	$	65,003,509	$	80,655,096
Singapore		23,979,343		26,054,856		29,068,748
China (includes Hong Kong)		19,115,188		22,629,388		31,176,136
Japan		9,855,772		15,363,352		13,705,192
USA		19,957,615		24,546,963		24,270,210
Europe		6,900,339		6,416,235		5,628,998
Others		14,426,949		16,806,611		28,506,638
Total	$	148,201,641	$	176,820,914	$	213,011,018

The geographic breakdown of the Company’s operating revenues was based on the location of the Company’s customers.

iii. By the timing of revenue recognition

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
At a point in time	$	147,057,035	$	174,492,036	$	211,074,982
Over time		1,144,606		2,328,878		1,936,036
Total	$	148,201,641	$	176,820,914	$	213,011,018

b. Contract balances

i. Contract assets, current

	As of January 1,			As of December 31,
	2020			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Sales of goods and services	$	599,491		$	625,222		$	677,326
Less: Loss allowance		(385,248	)		(367,381	)		(357,705	)
Net	$	214,243		$	257,841		$	319,621

F-82

The loss allowance was assessed by the Company primarily at an amount equal to lifetime expected credit losses. The loss allowance was mainly resulted from the suspension of the joint technology development agreement as disclosed in Note 9(7).

ii. Contract liabilities

	As of January 1,		As of December 31,
	2020		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Sales of goods and services	$	1,470,195	$	2,497,469	$	4,083,140
Current	$	988,115	$	2,040,989	$	3,441,754
Non-current		482,080		456,480		641,386
Total	$	1,470,195	$	2,497,469	$	4,083,140

The movement of contract liabilities is mainly caused by the timing difference of the satisfaction of a performance of obligation and the consideration received from customers.

The Company recognized NT$706 million and NT$1,416 million, respectively, in revenues from the contract liabilities balance at the beginning of the period as performance obligations were satisfied for the years ended December 31, 2020 and 2021.

c. The Company’s transaction price allocated to unsatisfied performance obligations amounted to NT$2,759 million and NT$167 million as of December 31, 2020 and 2021, respectively. The Company will recognize revenue as the Company satisfies its performance obligations over time that aligns with progress toward completion of a contract in the future. As of the report date, partial contract was due in May 2021. The estimate of the transaction price does not include any estimated amounts of variable consideration that are constrained.

d. Asset recognized from costs to fulfill a contract with customer

As of December 31, 2020 and 2021, the Company recognized costs to fulfill engineering service contracts eligible for capitalization as other current assets which amounted to NT$549 million and NT$612 million, respectively. Subsequently, the Company will expense from costs to fulfill a contract to operating costs when the related obligations are satisfied.

F-83

(21) Operating Costs and Expenses

The Company’s employee benefit, depreciation and amortization expenses are summarized as follows:

	For the years ended December 31,
	2019						2020						2021
	Operating costs		Operating expenses		Total		Operating costs		Operating expenses		Total		Operating costs		Operating expenses		Total
	NT$						NT$						NT$
	(In Thousands)						(In Thousands)						(In Thousands)
Employee benefit expenses
Salaries	$	17,109,432	$	7,712,792	$	24,822,224	$	20,367,325	$	9,412,151	$	29,779,476	$	23,388,888	$	11,806,207	$	35,195,095
Labor and health insurance		911,037		395,571		1,306,608		1,061,848		452,848		1,514,696		1,183,315		458,179		1,641,494
Pension		1,066,877		361,281		1,428,158		1,138,429		379,298		1,517,727		1,259,044		399,879		1,658,923
Other employee benefit expenses		303,358		124,631		427,989		274,838		121,858		396,696		335,829		144,668		480,497
Depreciation		45,068,673		1,841,954		46,910,627		43,969,732		1,926,226		45,895,958		42,002,745		1,908,719		43,911,464
Amortization		848,214		1,368,440		2,216,654		895,732		1,848,651		2,744,383		834,384		2,060,558		2,894,942

According to UMC’s Articles of Incorporation, the employees and directors’ compensation shall be distributed in the following order:

UMC shall allocate no less than 5% of profit as employees’ compensation and no more than 0.2% of profit as directors’ compensation for each profitable fiscal year after offsetting any cumulative losses. The aforementioned employees’ compensation will be distributed in shares or cash. The employees of UMC’s subsidiaries who fulfill specific requirements stipulated by the Board of Directors may be granted such compensation. Directors may only receive compensation in cash. UMC may, by a resolution adopted by a majority vote at a meeting of the Board of Directors attended by two-thirds of the total number of directors, distribute the aforementioned employees and directors’ compensation and report to the shareholders’ meeting for such distribution.

The Company recognizes the employees and directors’ compensation in the profit or loss during the periods when earned for the years ended December 31, 2019, 2020 and 2021. The Board of Directors estimates the amount by taking into consideration the Articles of Incorporation, government regulations and industry averages. If the Board of Directors resolves to distribute employee compensation through stock, the number of stock distributed is calculated based on total employee compensation divided by the closing price of the day before the Board of Directors’ meeting. If the Board of Directors subsequently modifies the estimates significantly, the Company will recognize the change as an adjustment in the profit or loss in the subsequent period.

F-84

The distributions of employees and directors’ compensation for 2019 and 2020 were reported to the shareholders’ meeting on June 10, 2020 and July 7, 2021, respectively, while the distributions of employees and directors’ compensation for 2021 were approved through the Board of Directors’ meeting on February 24, 2022. The details of distribution were as follows:

	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Employees’ compensation – Cash	$	1,132,952	$	2,581,675	$	4,770,909
Directors’ compensation		10,259		32,369		25,264

The aforementioned employees and directors’ compensation for 2019 and 2020 reported during the shareholders’ meeting were consistent with the resolutions of the Board of Directors’ meeting held on February 26, 2020 and February 24, 2021, respectively.

Information relevant to the aforementioned employees and directors’ compensation can be obtained from the “Market Observation Post System” on the website of the TWSE.

F-85

(22) Net Other Operating Income and Expenses

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Government grants	$	5,366,907		$	5,179,643		$	5,269,412
Rental income from property, plant and equipment		200,351			198,860			187,166
Gain on disposal of property, plant and equipment		43,036			1,137,320			143,735
Impairment loss
Property, plant and equipment		(84,974	)		—			—
Goodwill		(7,398	)		—			—
Others		(335,760	)		(261,933	)		(373,482	)
Total	$	5,182,162		$	6,253,890		$	5,226,831

(23) Non-Operating Income and Expenses

a. Other gains and losses

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Gain on valuation of financial assets and liabilities at fair value through profit or loss	$	1,279,931		$	2,011,403		$	2,892,470
Impairment loss
Investments accounted for under the equity method		(25,762	)		—			—
Loss on disposal of investments		(16,293	)		(91,070	)		(16,388	)
Others		(71,147	)		(1,871,567	)		(2,009,952	)
Total	$	1,166,729		$	48,766		$	866,130

F-86

Others included the one-time payment to MICRON TECHNOLOGY, INC. (MICRON) due to the worldwide settle agreement between UMC and MICRON (Please refer to Note 9(7)) and the losses of financial instrument transaction recognized in 2021, and the losses for the settlement approved by the U.S. Department of Justice regarding allegation of conspiracy to engage in theft of trade secrets recognized in 2020, respectively.

b. Finance costs

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Interest expenses
Bonds payable	$	672,902	$	377,193	$	437,055
Bank loans		1,808,633		1,417,028		1,285,708
Lease liabilities		178,112		154,730		145,187
Others		274,168		55,467		139
Financial expenses		63,828		69,015		94,841
Total	$	2,997,643	$	2,073,433	$	1,962,930

F-87

(24) Components of Other Comprehensive Income (Loss)

	For the year ended December 31, 2019
	Arising during the period			Reclassification adjustments during the period		Other comprehensive income (loss), before tax			Income tax effect			Other comprehensive income (loss), net of tax
	NT$			NT$		NT$			NT$			NT$
	(In Thousands)			(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit pension plans	$	106,403		$	—	$	106,403		$	(21,281	)	$	85,122
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		5,486,209			—		5,486,209			(394,695	)		5,091,514
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		899,025			—		899,025			(41,643	)		857,382
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(3,292,023	)		14,085		(3,277,938	)		14,949			(3,262,989	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		8,799			6,594		15,393			(8,843	)		6,550
Total other comprehensive income (loss)	$	3,208,413		$	20,679	$	3,229,092		$	(451,513	)	$	2,777,579

F-88

	For the year ended December 31, 2020
	Arising during the period			Reclassification adjustments during the period			Other comprehensive income (loss), before tax			Income tax effect			Other comprehensive income (loss), net of tax
	NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit pension plans	$	(192,581	)	$	—		$	(192,581	)	$	38,516		$	(154,065	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		4,815,361			—			4,815,361			(134,887	)		4,680,474
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		883,508			—			883,508			(115,048	)		768,460
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(2,917,361	)		(2,919	)		(2,920,280	)		38,541			(2,881,739	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		37,474			22,843			60,317			7,372			67,689
Total other comprehensive income (loss)	$	2,626,401		$	19,924		$	2,646,325		$	(165,506	)	$	2,480,819

F-89

	For the year ended December 31, 2021
	Arising during the period			Reclassification adjustments during the period			Other comprehensive income (loss), before tax			Income tax effect			Other comprehensive income (loss), net of tax
	NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit pension plans	$	(197,477	)	$	—		$	(197,477	)	$	39,495		$	(157,982	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		5,811,342			—			5,811,342			(360,061	)		5,451,281
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		2,959,130			—			2,959,130			(96,510	)		2,862,620
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(4,743,299	)		2,283			(4,741,016	)		23,175			(4,717,841	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		(24,018	)		(394	)		(24,412	)		6,763			(17,649	)
Total other comprehensive income (loss)	$	3,805,678		$	1,889		$	3,807,567		$	(387,138	)	$	3,420,429

F-90

(25) Income Tax

a. The major components of income tax expense (benefit) for the years ended December 31, 2019, 2020 and 2021 were as follows:

i. Income tax expense (benefit) recorded in profit or loss

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Current income tax expense (benefit):
Current income tax charge	$	772,795		$	2,346,937		$	7,088,975
Adjustments in respect of current income tax of prior periods		(1,033,780	)		(1,140,060	)		(150,260	)
Deferred income tax expense (benefit):
Deferred income tax related to origination and reversal of temporary differences		465,530			49,035			407,280
Deferred income tax related to recognition and derecognition of tax losses and unused tax credits		231,971			683,080			723,270
Adjustment of prior year’s deferred income tax		121,189			(246,173	)		(130,841	)
Deferred income tax arising from write-down or reversal of write-down of deferred tax assets		(327,359	)		(1,736	)		(20,172	)
Income tax expense recorded in profit or loss	$	230,346		$	1,691,083		$	7,918,252

F-91

ii. Deferred income tax related to components of other comprehensive income (loss)

(i) Items that will not be reclassified subsequently to profit or loss:

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Remeasurements of defined benefit pension plans	$	(21,281	)	$	38,516		$	39,495
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		(394,695	)		(134,887	)		(360,061	)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		(41,643	)		(115,048	)		(96,510	)
Income tax related to items that will not be reclassified subsequently to profit or loss	$	(457,619	)	$	(211,419	)	$	(417,076	)

F-92

(ii) Items that may be reclassified subsequently to profit or loss:

	For the years ended December 31,
	2019			2020		2021
	NT$			NT$		NT$
	(In Thousands)			(In Thousands)		(In Thousands)
Exchange differences on translation of foreign operations	$	14,949		$	38,541	$	23,175
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		(8,843	)		7,372		6,763
Income tax related to items that may be reclassified subsequently to profit or loss	$	6,106		$	45,913	$	29,938

iii.   Income tax charged directly to equity    

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Current income tax expense (benefit):
Disposal of parent company’s stock by subsidiary recognized as treasury stock transactions	$	—		$	—		$	(203	)
Deferred income tax expense (benefit):
Recognize (reversal) of temporary difference arising from initial recognition of the equity component of the compound financial instrument		(45	)		3,691			—
Adjustments of changes in net assets of associates and joint ventures accounted for using equity method		(532	)		(91	)		22
Gains or losses on hedging instruments which will not be reclassified subsequently to profit or loss		(514	)		—			—
Income tax charged directly to equity	$	(1,091	)	$	3,600		$	(181	)

F-93

b. A reconciliation between income tax expense (benefit) and income before tax at UMC’s applicable tax rate were as follows:

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Income before tax	$	4,806,596		$	22,542,750		$	58,496,432
At UMC’s statutory income tax rate		961,319			4,508,550			11,699,286
Adjustments in respect of current income tax of prior periods		(1,033,780	)		(1,140,060	)		(150,260	)
Net changes in loss carry-forward and investment tax credits		2,387,922			447,570			(845,267	)
Adjustment of deferred tax assets/liabilities for write-downs/reversals and different jurisdictional tax rates		(169,568	)		(505,537	)		183,123
Tax effect of non-taxable income and non-deductible expenses:
Tax exempt income		(1,778,820	)		(2,500,688	)		(3,258,695	)
Investment gain		(270,610	)		(431,501	)		(1,388,877	)
Dividend income		(139,093	)		(130,672	)		(171,725	)
Others		110,991			32,268			6,463
Basic tax		3,215			2,803			—
Estimated income tax on unappropriated earnings		150,401			1,087,216			1,558,031
Effect of different tax rates applicable to UMC and its subsidiaries		(102,608	)		(191,687	)		116,174
Taxes withheld in other jurisdictions		19,749			25,193			43,443
Others		91,228			487,628			126,556
Income tax expense recorded in profit or loss	$	230,346		$	1,691,083		$	7,918,252

F-94

c. Significant components of deferred income tax assets and liabilities were as follows:

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Deferred income tax assets
Depreciation	$	2,116,855		$	2,155,961
Loss carry-forward		685,531			62,367
Pension		828,410			770,847
Refund liabilities		240,165			140,861
Allowance for inventory valuation losses		595,910			433,630
Investment loss		389,743			349,794
Unrealized profit on intercompany sales		1,348,202			1,125,370
Others		461,160			439,439
Total deferred income tax assets		6,665,976			5,478,269
Deferred income tax liabilities
Unrealized exchange gain		(559,334	)		(580,191	)
Depreciation		(156,000	)		(78,792	)
Investment gain		(933,038	)		(1,354,740	)
Bonds		—			(6,353	)
Amortizable assets		(316,049	)		(303,841	)
Others		(687	)		—
Total deferred income tax liabilities		(1,965,108	)		(2,323,917	)
Net deferred income tax assets	$	4,700,868		$	3,154,352

F-95

d. Movement of deferred tax

	For the years ended December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Balance as of January 1	$	5,342,127		$	4,700,868
Amounts recognized in profit or loss during the period		(484,206	)		(979,537	)
Amounts recognized in other comprehensive income (loss)		(165,506	)		(387,138	)
Amounts recognized in equity		3,600			22
Exchange adjustments		4,853			(179,863	)
Balance as of December 31	$	4,700,868		$	3,154,352

e. The Company is subject to taxation in Taiwan and other foreign jurisdictions. As of December 31, 2021, income tax returns of UMC and its subsidiaries in Taiwan have been examined by the tax authorities through 2018, while in other foreign jurisdictions, relevant tax authorities have completed the examination through 2012. There is an uncertain tax position that the outcome of the income tax returns of certain companies within the Company may not be accepted by the tax authorities of the respective countries of operations. For the recognition and measurement of deferred income tax and current income tax which involved significant accounting judgments, estimates and assumptions, please refer to Note 5(3).

f. UMC was granted income tax exemption for several periods with respect to income derived from the expansion of operations. The income tax exemption had expired on December 31, 2020.

g. UMC’s branch in Singapore obtained two tax incentives granted by the Singapore government for a period of five years from August 2020. The qualifying incomes are either tax-exempt or taxed at concessionary tax rate. The incentive period will end in July 2025.

h. The information of the unused tax loss carry-forward for which no deferred income tax assets have been recognized were as follows:

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Expiry period
1-5 years	$	40,910,279	$	38,562,420
6-10 years		2,674,422		2,730,567
Total	$	43,584,701	$	41,292,987

F-96

i. As of December 31, 2020 and 2021, deductible temporary differences for which no deferred income tax assets have been recognized amounted to NT$2,942 million and NT$4,433 million, respectively.

j. As of December 31, 2020 and 2021, the taxable temporary differences of unrecognized deferred tax liabilities associated with investments in subsidiaries amounted to NT$11,463 million and NT$14,904 million, respectively.

(26) Earnings Per Share

a. Earnings per share-basic

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	8,155,097	$	22,860,744	$	51,246,425
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)		11,565,068		11,850,052		12,005,126
Earnings per share-basic (NTD)	$	0.71	$	1.93	$	4.27

F-97

b. Earnings per share-diluted

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	8,155,097	$	22,860,744	$	51,246,425
Effect of dilution
Unsecured convertible bonds		289,121		69,019		—
Income attributable to shareholders of the parent	$	8,444,218	$	22,929,763	$	51,246,425
Weighted—average number of ordinary shares for basic earnings per share (thousand shares)		11,565,068		11,850,052		12,005,126
Effect of dilution
Restricted stocks for employees		—		30,911		159,478
Employees’ compensation		90,047		65,657		80,243
Unsecured convertible bonds		1,295,729		303,630		—
Weighted—average number of ordinary shares after dilution (thousand shares)		12,950,844		12,250,250		12,244,847
Earnings per share-diluted (NTD)	$	0.65	$	1.87	$	4.19

F-98

(27) Reconciliation of Liabilities Arising from Financing Activities

For the year ended December 31, 2019

	As of December 31, 2018		Cash Flows			Non-cash changes						As of December 31, 2019
Items						Foreign exchange			Others (Note A)
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	13,103,808	$	(993,723	)	$	(368,507	)	$	273,628		$	12,015,206
Long-term loans (current portion included)		30,826,215		3,876,991			(802,975	)		1,843			33,902,074
Bonds payable (current portion included)		41,378,182		(2,500,000	)		—			(96,766	)		38,781,416
Guarantee deposits (current portion included)		665,793		252,269			(2,021	)		(619,347	)		296,694 (Note E	)
Lease liabilities		6,006,457		(633,488	)		(78,432	)		736,488 (Note C	)		6,031,025
Other financial liabilities-noncurrent (Note B)		20,410,355		—			(698,127	)		381,213			20,093,441

F-99

For the year ended December 31, 2020

						Non-cash changes
Items	As of December 31, 2019		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2020
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	12,015,206	$	(933,392	)	$	(75,751	)	$	51,069		$	11,057,132
Long-term loans (current portion included)		33,902,074		136,920			(972,888	)		—			33,066,106
Bonds payable (current portion included)		38,781,416		(13,702,875	)		—			(6,388,157 (Note D	)  )		18,690,384
Guarantee deposits (current portion included)		296,694		(59,819	)		(883	)		—			235,992 (Note E	)
Lease liabilities		6,031,025		(726,626	)		(10,036	)		282,501			5,576,864
Other financial liabilities-noncurrent (Note B)		20,093,441		—			281,219			371,964			20,746,624

For the year ended December 31, 2021

						Non-cash changes
Items	As of December 31, 2020		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2021
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	11,057,132	$	(8,974,216	)	$	(158,792	)	$	—		$	1,924,124
Long-term loans (current portion included)		33,066,106		4,088,537			(529,736	)		—			36,624,907
Bonds payable (current portion included)		18,690,384		23,703,692			—			(1,857,418 (Note F	)  )		40,536,658
Guarantee deposits (current portion included)		235,992		14,219,408			(85,631	)		—			14,369,769 (Note E	)
Lease liabilities		5,576,864		(699,680	)		(144,419	)		335,989			5,068,754
Other financial liabilities (Note B)		20,746,624		—			(163,387	)		382,972			20,966,209

F-100

Note A: Other non-cash changes mainly consisted of discount amortization measured by the effective interest method.

Note B: Please refer to Note 9(6) for more details on other financial liabilities.

Note C: Including the impact from acquisition of a subsidiary.

Note D: Please refer to Note 6(13) for the Company’s convertible bonds.

Note E: Guarantee deposits mainly consisted of deposits of capacity reservation.

Note F: Please refer to Note 6(13) for the Company’s exchangeable bonds.

(28) Business Combinations

UNITED SEMICONDUCTOR JAPAN CO., LTD. (USJC)

The Company exercised the call option of a joint venture agreement between FUJI SEMICONDUCTOR LIMITED (FSL) to acquire 84.1% ownership interest in MIE FUJITSU SEMICONDUCTOR LIMITED (MIFS) for JPY 54.4 billion on October 1, 2019. The Company previously held 15.9% of ownership interest in MIFS. MIFS became a wholly-owned subsidiary of the Company and was renamed as USJC upon completion of the acquisition. USJC is a 300mm fab in Japan that is currently manufacturing 90nm, 65nm and 40nm products. The fab fits the Company’s specialty technology focus and long-term growth projections. USJC will increase the Company’s foundry market share, provide business synergies and benefit from economies of scale while broadening the Company’s comprehensive specialty and logic technologies to serve Japanese and international customers.

The fair value of the net identifiable assets acquired and liabilities assumed was in excess of the aggregate consideration transferred and the previously held ownership interest of 15.9% in USJC at the acquisition date, and the difference was recognized as bargain purchase gain. The previously held ownership interest of 15.9% in USJC was previously accounted for as financial assets at fair value through other comprehensive income, non-current. It was subsequently remeasured at fair value with the consideration for a minority interest discount on the acquisition date resulting in the bargain purchase gain. Upon the acquisition, the Company recognized a loss on disposal of NT$375 million and the accumulated unrealized losses on the previously held ownership interest was reclassified from other comprehensive income to retained earnings for the year ended December 31, 2019.

Upon the acquisition, USJC contributed NT$4,277 million of operating revenues and NT$305 million to profit before tax from continuing operations of the Company, respectively, for the year ended December 31, 2019. If the combination had taken place at the beginning of the year, operating revenues from the continuing operations would have been NT$160,767 million and the profit before tax from continuing operations for the Company would have been NT$5,606 million, respectively, for the year ended December 31, 2019.

F-101

(29) Deconsolidation of Subsidiaries

NEXPOWER TECHNOLOGY CORP. (NEXPOWER)

NEXPOWER, the subsidiary of UMC, was resolved for dissolution and liquidation by the shareholders’ meeting on November 11, 2020 and the liquidator took control on the same day. According to IFRS 10, the Company has lost control over NEXPOWER and therefore derecognized its relevant assets and liabilities at the date when the control was lost.

a. Derecognized assets and liabilities mainly consisted of:

	NT$
	(In Thousands)
Assets
Cash and cash equivalents	$	776,586
Other current assets		18
		776,604
Liabilities
Other payables		(194	)
		(194	)
Net assets of the deconsolidation	$	776,410

b. Consideration received and gain recognized from the deconsolidation:

	NT$
	(In Thousands)
Cash received	$	722,559
Less: Net assets of the deconsolidation		(776,410	)
Add: Non-controlling interests		51,565
Other comprehensive income from equity reclassified to profit or loss due to derecognition		4,061
Gain on deconsolidation (Note A)	$	1,775

F-102

Note A: Gain on deconsolidation was recognized as other gains and losses in the consolidated statement of comprehensive income.

c. Analysis of net cash outflow arising from deconsolidation of the subsidiary:

	NT$
	(In Thousands)
Cash received	$	722,559
Net cash of subsidiary derecognized		(776,586	)
Net cash outflow from deconsolidation	$	(54,027	)

F-103

7. SIGNIFICANT RELATED PARTY TRANSACTIONS

a. Significant intercompany transactions between consolidated entities were as follows:

For the year ended December 31, 2019

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	47,736,335		Net 60 days
UMC	UMC-USA	Accounts receivable		5,937,706		—
UMC	UMC GROUP JAPAN	Sales		3,933,964		Net 60 days
UMC	UMC GROUP JAPAN	Accounts receivable		608,622		—
UMC	USCXM	Sales		1,209,310 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		31,334		—
UMC	USCXM	Loan receivable		1,201,200		—
USCXM	UMC-USA	Sales		745,226		Net 60 days
USCXM	UMC-USA	Accounts receivable		33,242		—
HJ	UMC-USA	Sales		152,012		Net 60 days
HJ	UMC-USA	Accounts receivable		21,138		—
HJ	UMC GROUP JAPAN	Sales		250,736		Net 60 days
HJ	UMC GROUP JAPAN	Accounts receivable		51,150		—

F-104

For the year ended December 31, 2020

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	49,357,981		Net 60 days
UMC	UMC-USA	Accounts receivable		5,388,172		—
UMC	UMC GROUP JAPAN	Sales		1,220,419		Net 60 days
UMC	USCXM	Sales		1,183,180 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		24,831		—
USCXM	UMC-USA	Sales		970,358		Net 60 days
USCXM	UMC-USA	Accounts receivable		250,092		—
HJ	UMC-USA	Sales		137,860		Net 60 days
HJ	UMC-USA	Accounts receivable		33,069		—
HJ	UMC GROUP JAPAN	Sales		106,077		Net 60 days
USJC	UMC-USA	Sales		1,395,094		Net 60 days
USJC	UMC-USA	Accounts receivable		456,860		—

F-105

For the year ended December 31, 2021

Entity	Counterparty	Transactions (Note D)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	48,440,369		Net 60 days
UMC	UMC-USA	Accounts receivable		6,286,428		—
UMC	USCXM	Sales		1,222,320 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		29,012		—
UMC	UDS	Sales		178,331		Net 30 days
UMC	UDS	Accounts receivable		18,818		—
USJC	UMC-USA	Sales		2,917,993		Net 60 days
USJC	UMC-USA	Accounts receivable		428,363		—
USCXM	UMC-USA	Sales		1,444,736		Net 60 days
USCXM	UMC-USA	Accounts receivable		221,375		—
WAVETEK	UMC-USA	Sales		545,785		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		126,580		—
WAVETEK	UMC	Sales		110,620		Month-end 30 days
HJ	UMC-USA	Sales		366,968		Net 60 days
HJ	UMC-USA	Accounts receivable		60,147		—

Note A: The significant intercompany transactions listed above include downstream transactions.

Note B: The sales price to the above related parties was determined through mutual agreement in reference to market conditions.

Note C: UMC authorized technology licenses to its subsidiary, USCXM, in the amount of US$0.35 billion, which was recognized as deferred revenue to be realized over time.

Note D: The significant intercompany transactions listed above include downstream and upstream transactions.

F-106

b. Significant transactions between the Company and other related parties were as follows:

(i) Name and Relationship of Related Parties

Name of related parties	Relationship with the Company
FARADAY TECHNOLOGY CORP. and its Subsidiaries	Associate
HSUN CHIEH INVESTMENT CO., LTD.	Associate
HSUN CHIEH CAPITAL CORP.	Associate
TRIKNIGHT CAPITAL CORPORATION	Associate
UNIMICRON TECHNOLOGY CORP.	Associate
SILICON INTEGRATED SYSTEMS CORP.	The Company’s director
PHOTRONICS DNP MASK CORPORATION	Other related parties
UNITEDVISION SEMICONDUCTOR CO., LTD.	Other related parties
UPI SEMICONDUCTOR CORP.	Other related parties
UNISTARS CORPORATION	Other related parties

(ii) Operating revenues

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	1,532,339	$	2,085,425	$	2,778,544
Others		45,523		26,856		38,797
Total	$	1,577,862	$	2,112,281	$	2,817,341

(iii) Accounts receivable, net

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	172,808	$	555,064
Others		6,110		11,274
Total	$	178,918	$	566,338

The sales price to the above related parties was determined through mutual agreement in reference to market conditions. The collection periods for domestic sales to related parties were month-end 30-60 days, while the collection periods for overseas sales were month-end or net 30-60 days.

F-107

(iv) Refund liabilities (classified under other current liabilities)

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	1,186	$	1,841
Others		36		27
Total	$	1,222	$	1,868

(v) Significant asset transactions

Acquisition of financial assets at fair value through profit or loss, noncurrent

					For the year ended December 31, 2019
	Trading Volume (In thousands of shares)		Transaction underlying		Purchase price
					NT$
					(In Thousands)
Associates		500		Stock of MATERIALS ANALYSIS TECHNOLOGY INC.	$	32,923
Associates		1,900		Stock of GEAR RADIO LTD.		37,211
Total					$	70,134

				For the year ended December 31, 2020
	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		1,000	Stock of WELLYSUN INC.	$	25,000

F-108

				For the year ended December 31, 2021
	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		82	Stock of ARTERY TECHNOLOGY CORPORATION	$	13,929

Acquisition of investments accounted for under the equity method

				For the year ended December 31, 2019
	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		72,000	Stock	$	720,000

For the years ended December 31, 2020 and 2021: None.

Acquisition of intangible assets

	Purchase price
	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	339,463	$	335,425	$	181,254

(vi)   Others
Mask expenditure
	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Others	$	2,346,263	$	1,811,827	$	1,861,438

F-109

Other payables of mask expenditure
	As of December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Others	$	683,892	$	532,810	$	560,042

c. Key management personnel compensation

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Short-term employee benefits	$	271,135	$	435,251	$	562,117
Post-employment benefits		2,406		2,458		2,322
Termination benefits		3,415		283		—
Share-based payment		62,203		365,666		1,035,401
Others		578		571		578
Total	$	339,737	$	804,229	$	1,600,418

8. ASSETS PLEDGED AS COLLATERAL

The following table lists assets of the Company pledged as collateral:

	As of December 31,
	2020		2021		Party to which asset(s) was pledged	Purpose of pledge
	NT$		NT$
	(In Thousands)		(In Thousands)
Refundable Deposits (Time deposit)	$	811,072	$	811,660	Customs	Customs duty guarantee
Refundable Deposits (Time deposit)		234,286		234,304	Science Park Bureau	Collateral for land lease
Refundable Deposits (Time deposit)		18,215		20,619	Science Park Bureau	Collateral for dormitory lease
Refundable Deposits (Time deposit)		41,785		26,600	Liquefied Natural Gas Business Division, CPC Corporation, Taiwan	Energy resources guarantee

F-110

	As of December 31,
	2020		2021		Party to which asset(s) was pledged	Purpose of pledge
	NT$		NT$
	(In Thousands)		(In Thousands)
Refundable Deposits (Time deposit)		1,000,000		1,151,200	Bank of China and Agricultural Bank of China	Bank performance guarantee
Refundable Deposits (Bank deposit)		—		6,711	Shanghai Commercial Bank	Collateral for letter of credit
Buildings		5,310,769		5,014,814	Taiwan Cooperative Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Machinery and equipment		21,370,450		25,189,533	Taiwan Cooperative Bank, Mega International Commercial Bank, KGI Bank, First Commercial Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Transportation equipment		3,174		1,802	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Furniture and fixtures		281,663		161,604	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Right-of-use assets		289,552		280,697	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Total	$	29,360,966	$	32,899,544

9. SIGNIFICANT CONTINGENCIES AND UNRECOGNIZED CONTRACT COMMITMENTS

(1) As of December 31, 2021, amounts available under unused letters of credit for importing machinery and equipment were NT$0.3 billion.

(2) As of December 31, 2021, the Company entrusted financial institutions to open performance guarantee, mainly related to the litigations and customs tax guarantee, amounting to NT$1.6 billion.

F-111

(3) The Company entered into several patent license agreements and development contracts of intellectual property for a total contract amount of approximately NT$2.8 billion. As of December 31, 2021, the portion of royalties and development fees not yet recognized was NT$0.9 billion.

(4) The Company entered into several construction contracts for the expansion of its operations. As of December 31, 2021, these construction contracts amounted to approximately NT$19.6 billion and the portion of the contracts not yet recognized was approximately NT$14.4 billion.

(5) The Company entered into several wafer-processing contracts with its customers. According to the contracts, the Company shall provide agreed production capacity with the customers.

(6) The Board of Directors of UMC resolved in October 2014 to participate in a 3-way agreement with Xiamen Municipal People’s Government and FUJIAN ELECTRONIC & INFORMATION GROUP to form a company which will focus on 12’’ wafer foundry services. The Company obtained R.O.C. government authority’s approval for the investment and invested RMB¥8.3 billion in USCXM in instalments from January 2015 to September 2018, according to the agreement that the Company obtained the ability to exercise control. Furthermore, based on the agreement, UMC recognized a financial liability in other financial liabilities, current and other noncurrent liabilities, respectively for the purchase from the other investors of their investments in USCXM at their original investment cost plus interest totally amounting to RMB¥4.9 billion, beginning from the seventh year (2022) following the last instalment payment made by the other investors. Accordingly, the Company recognizes non-controlling interests as required by IFRS 10 during the reporting period. At the end of each reporting period, the Company recognizes a financial liability for its commitment to the other investors in accordance with IFRS 9, at the same time derecognizing the non-controlling interests. Any difference between the financial liability and the non-controlling interests balance is recognized in equity.

(7) On August 31, 2017, the Taichung District Prosecutors Office indicted UMC based on the Trade Secret Act of R.O.C., alleging that employees of UMC misappropriated the trade secrets of MICRON TECHNOLOGY, INC. (“MICRON”). On June 12, 2020, an adverse ruling issued by the District Court of Taichung in a suit alleged that UMC, two of its current employees and a former employee engaged in the misappropriation of trade secrets. UMC appealed against the sentence. On November 26, 2021, UMC and MICRON announced a settlement agreement between the two companies for all legal proceedings worldwide (the “Settlement Agreement”). Accordingly, MICRON submitted a motion to withdraw the case. On January 27, 2022, the Intellectual Property and Commercial Court announced its ruling of this case and UMC was sentenced to a fine of NT$20 million, subject to a two-year term of probation.

 

F-112

On December 5, 2017, MICRON filed a civil action with similar cause against UMC with the United States District Court, Northern District of California. MICRON claimed entitlement to the actual damages, treble damages and relevant fees and requested the court to issue an order that enjoins UMC from using its trade secrets in question. In accordance with the Settlement Agreement, the court issued a dismissal of the case with prejudice in January 2022.

On January 12, 2018, UMC filed three patent infringement actions with the Fuzhou Intermediate People’s Court against, among others, MICRON (XI’AN) CO., LTD. and MICRON (SHANGHAI) TRADING CO., LTD., requesting the court to order the defendants to stop manufacturing, processing, importing, selling, and committing to sell the products deploying the infringing patents in question, and also to destroy all inventories and related molds and tools. On July 3, 2018, the Fuzhou Intermediate People’s Court granted preliminary injunction against the aforementioned two defendants, holding that the two defendants must immediately cease to manufacture, sell, and import products that infringe the patent rights of UMC. The court approved withdrawal of one of the patent infringement actions on our motion while the other two actions are still on trial. In accordance with the Settlement Agreement, UMC submitted a motion to withdraw the case, and the motion is currently pending.

The amounts of aforementioned fine from ruling of the Intellectual Property and Commercial Court and the worldwide settlement between UMC and MICRON were recorded in non-operating other losses and have no material financial and operational effect on UMC’s business for the years presented.

(8) On March 14, 2019, a putative class action complaint was filed in the United States District Court for the Southern District of New York against the Company and certain of its officers and/or directors, alleging violations of Section 10(b) of the Securities Exchange Act and Rule 10b-5 thereunder, arising out of an alleged scheme to misappropriate trade secrets. On May 3, 2021, the court approved the settlement reached between the plaintiffs and the defendants and UMC paid a settlement amount of US$3 million to be allocated to the class plaintiffs and reimbursement of legal fees of class plaintiffs. The settlement has been recorded in non-operating other losses and has no material financial and operational effect on UMC’s business.

10. SIGNIFICANT SUBSEQUENT EVENTS

(1) On January 27, 2022, Intellectual Property and Commercial Court issued a ruling for a suit alleging UMC misappropriated trade secrets. Please refer to Note 9(7) for further information.

(2) On April 27, 2022, the Board of Directors of UMC approved an investment to increase capital of RMB¥4.12 billion or equivalent US dollars (approximately US$0.66 billion) in its Cayman Islands subsidiary, UNITED MICROCHIP CORPORATION, for its Samoa subsidiary, GREEN EARTH LIMITED, to purchase the shares of UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (hereinafter referred to as USCXM) from XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.; in addition, the Company’s subsidiary, HEJIAN TECHNOLOGY (SUZHOU) CO., LTD., plans to purchase shares of USCXM with RMB¥0.74 billion or equivalent US dollars (approximately US$0.12 billion) from FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP. As a result, the total investment amount is RMB¥4.86 billion. The transaction will be completed in three years consecutively from 2022 at the ratio of 60%, 20% and 20%, respectively. Please refer to Note 9(6) for more details.

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11. FINANCIAL RISK AND FAIR VALUE DISCLOSURES

(1) Categories of financial instruments

	As of December 31,
Financial Assets	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets at fair value through profit or loss	$	16,042,721	$	20,446,295
Financial assets at fair value through other comprehensive income		10,526,144		19,835,665
Financial assets measured at amortized cost
Cash and cash equivalents (cash on hand excluded)		94,042,271		132,616,447
Receivables		28,942,147		36,047,680
Refundable deposits		2,310,961		2,358,549
Other financial assets		14,386,131		28,863,470
Total	$	166,250,375	$	240,168,106

	As of December 31,
Financial Liabilities	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial liabilities at fair value through profit or loss	$	2,326	$	2,380,599
Financial liabilities measured at amortized cost
Short-term loans		11,057,132		1,924,124
Payables		31,188,794		37,657,300
Guarantee deposits (current portion included)		235,992		14,369,769
Bonds payable (current portion included)		18,690,384		40,536,658
Long-term loans (current portion included)		33,066,106		36,624,907
Lease liabilities		5,576,864		5,068,754
Other financial liabilities		20,746,624		20,966,209
Total	$	120,564,222	$	159,528,320

(2) Financial risk management objectives and policies

The Company’s risk management objectives are to manage the market risk, credit risk and liquidity risk related to its operating activities. The Company identifies, measures and manages the aforementioned risks based on policy and risk preference.

The Company has established appropriate policies, procedures and internal controls for financial risk management. Before entering into significant financial activities, approval process by the Board of Directors and Audit Committee must be carried out based on related protocols and internal control procedures. The Company complies with its financial risk management policies at all times.

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(3) Market risk

Market risk is the risk that the fair value or future cash flows of a financial instrument will fluctuate because of changes in market prices. Market risks comprise currency risk, interest rate risk and other price risk (such as equity price risk).

Foreign currency risk

The Company’s exposure to the risk of changes in foreign exchange rates relates primarily to the Company’s operating activities (when revenue or expense is denominated in a different currency from the Company’s functional currency) and the Company’s net investments in foreign subsidiaries.

The Company applies natural hedges on the foreign currency risk arising from purchases or sales, and utilizes spot or forward exchange contracts to manage foreign currency risk and the net effect of the risks related to monetary financial assets and liabilities is minor. The notional amounts of the foreign currency contracts are the same as the amount of the hedged items. In principle, the Company does not carry out any forward exchange contracts for uncertain commitments. Furthermore, as net investments in foreign subsidiaries are for strategic purposes, they are not hedged by the Company.

Certain forward exchange contracts designated by the Company to hedge foreign currency exchange rate risks associated with the purchase of additional shares of USJC in JPY, amounting to JPY 23 billion, expired prior to December 31, 2018. The cash flow hedge reserve in other components of equity, amounting to NT$(3) million, was recognized as consideration for the ownership interest of 84.1% in USJC on October 1, 2019. Please refer to Note 6(28).

F-115

The foreign currency sensitivity analysis of the possible change in foreign exchange rates on the Company’s profit is performed on significant monetary items denominated in foreign currencies as of the end of the reporting period. When NTD strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2019, 2020 and 2021 decreases/increases by NT$1,009 million, NT$1,336 million and NT$1,104 million, respectively. When RMB strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2019, 2020 and 2021 increases/decreases by NT$2,200 million, NT$1,625 million and NT$375 million, respectively. When JPY strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2019, 2020 and 2021 decreases/increases by NT$430 million, NT$473 million and NT$434 million, respectively.

Interest rate risk

The Company is exposed to interest rate risk arising from borrowing at floating interest rates. All of the Company’s bonds have fixed interest rates and are measured at amortized cost. As such, changes in interest rates would not affect the future cash flows. On the other hand, as the interest rates of the Company’s short-term and long-term bank loans are floating, changes in interest rates would affect the future cash flows but not the fair value. Please refer to Note 6(11), 6(13) and 6(14) for the range of interest rates of the Company’s bonds and bank loans.

At the reporting dates, a change of 10 basis points of interest rate in a reporting period could cause the profit for the years ended December 31, 2019, 2020 and 2021 to decrease/increase by NT$46 million, NT$44 million and NT$39 million, respectively.

Equity price risk

The Company’s listed and unlisted equity securities and exchange right of the exchangeable bonds issued are susceptible to market price risk arising from uncertainties about future performance of equity markets. The Company’s equity investments are classified as financial assets at fair value through profit or loss and financial assets at fair value through other comprehensive income, while exchange right of the exchangeable bonds issued is classified as financial liabilities at fair value through profit or loss as it does not satisfy the definition of an equity component.

The sensitivity analysis for the equity instruments is based on the change in fair value as of the reporting date. A change of 5% in the price of the aforementioned financial assets at fair value through profit or loss of listed companies could increase/decrease the Company’s profit for the years ended December 31, 2019, 2020 and 2021 by NT$252 million, NT$263 million and NT$393 million, respectively. A change of 5% in the price of the aforementioned financial assets at fair value through other comprehensive income of listed companies could increase/decrease the Company’s other comprehensive income for the years ended December 31, 2019, 2020 and 2021 by NT$671 million, NT$453 million and NT$867 million, respectively.

F-116

Please refer to Note 11(7) for sensitivity analysis information of other equity instruments or derivatives that are linked to such equity instruments whose fair value measurement is categorized under Level 3.

(4) Credit risk management

The Company only trades with approved and creditworthy third parties. Where the Company trades with third parties which have less credit, it will request collateral from them. It is the Company’s policy that all customers who wish to trade on credit terms are subject to credit verification procedures. In addition, notes and accounts receivable balances are monitored on an ongoing basis to decrease the Company’s exposure to credit risk.

The Company mitigates the credit risks from financial institutions by limiting its counter parties to only reputable domestic or international financial institutions with good credit standing and spreading its holdings among various financial institutions. The Company’s exposure to credit risk arising from the default of counter-parties is limited to the carrying amount of these instruments.

As of December 31, 2020 and 2021, accounts receivable from the top ten customers represent 62% and 60% of the total accounts receivable of the Company, respectively. The credit concentration risk of other accounts receivable is insignificant.

(5) Liquidity risk management

The Company’s objectives are to maintain a balance between continuity of funding and flexibility through the use of cash and cash equivalents, bank loans, bonds and lease.

The table below summarizes the maturity profile of the Company’s financial liabilities based on the contractual undiscounted payments and contractual maturity:

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	As of December 31, 2020
	Less than 1 year			2 to 3 years		4 to 5 years		> 5 years		Total
	NT$			NT$		NT$		NT$		NT$
	(In Thousands)			(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Non-derivative financial liabilities
Short-term loans	$	11,240,785		$	—	$	—	$	—	$	11,240,785
Payables		31,008,010			—		—		—		31,008,010
Guarantee deposits		793			163,618		—		71,581		235,992
Bonds payable		2,374,587			8,484,393		8,563,021		—		19,422,001
Long-term loans		25,885,932			5,889,382		2,424,965		—		34,200,279
Lease liabilities		695,790			1,280,476		1,102,021		3,354,217		6,432,504
Other financial liabilities		—			17,120,418		4,280,333		—		21,400,751
Total	$	71,205,897		$	32,938,287	$	16,370,340	$	3,425,798	$	123,940,322
Derivative financial liabilities
Forward exchange contracts
Gross settlement
Inflow	$	393,442		$	—	$	—	$	—	$	393,442
Outflow		(395,768	)		—		—		—		(395,768	)
Net	$	(2,326	)	$	—	$	—	$	—	$	(2,326	)

F-118

	As of December 31, 2021
	Less than 1 year		2 to 3 years		4 to 5 years		> 5 years		Total
	NT$		NT$		NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Non-derivative financial liabilities
Short-term loans	$	1,939,109	$	—	$	—	$	—	$	1,939,109
Payables		37,455,640		—		—		—		37,455,640
Guarantee deposits		108,740		3,432,749		—		10,828,280		14,369,769
Bonds payable (Note)		8,612,255		8,869,431		10,656,506		4,178,008		32,316,200
Long-term loans		21,084,795		2,543,611		11,021,076		5,976,645		40,626,127
Lease liabilities		688,613		1,198,528		1,050,786		2,841,010		5,778,937
Other financial liabilities		12,738,246		8,492,466		—		—		21,230,712
Total	$	82,627,398	$	24,536,785	$	22,728,368	$	23,823,943	$	153,716,494

Note: UMC issued unsecured exchangeable bonds where the bondholders may exchange the bonds at any time on or after October 8, 2021 and prior to June 27, 2026 into Novatek common shares which UMC holds and accounts for as equity instruments investments measured at fair value through other comprehensive income. The balances of equity instruments investments measured at fair value through other comprehensive income was NT$8,482 million as of December 31, 2021. All or any portion of the bonds will be redeemable at put price at the option of bondholders on July 7, 2024 at 98.14% of the principal amount.

F-119

(6) Foreign currency risk management

UMC entered into forward exchange contracts for hedging the exchange rate risk arising from the net monetary assets or liabilities denominated in foreign currency. The details of forward exchange contracts entered into by UMC are summarized as follows:

As of December 31, 2020

Type	Notional Amount	Contract Period
Forward exchange contracts	Sell USD 82 million	December 11, 2020-February 5, 2021

As of December 31, 2021

None.

(7) Fair value measurement

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value measurement is based on the presumption that the transaction to sell the asset or transfer the liability takes place either in the principal market for the asset or liability, or in the absence of a principal market, in the most advantageous market for the asset or liability.

The principal or the most advantageous market must be accessible by the Company.

The fair value of an asset or a liability is measured using the assumptions that market participants would use when pricing the asset or liability, assuming that market participants act in their economic best interest.

A fair value measurement of a non-financial asset takes into account a market participant’s ability to generate economic benefits by using the asset in its highest and best use or by selling it to another market participant that would use the asset in its highest and best use.

The Company uses valuation techniques that are appropriate in the circumstances and for which sufficient data are available to measure fair value, maximizing the use of relevant observable inputs and minimizing the use of unobservable inputs.

F-120

All assets and liabilities for which fair value is measured or disclosed in the financial statements are categorized within the fair value hierarchy, described as follows, based on the lowest level input that is significant to the fair value measurement as a whole:

Level 1 — Quoted (unadjusted) market prices in active markets for identical assets or liabilities;

Level 2 — Valuation techniques for which the lowest level input that is significant to the fair value measurement is directly or indirectly observable;

Level 3 — Valuation techniques for which the lowest level input that is significant to the fair value measurement is unobservable.

For assets and liabilities that are recognized in the financial statements on a recurring basis, the Company determines whether transfers have occurred between levels in the hierarchy by re-assessing categorization (based on the lowest level input that is significant to the fair value measurement as a whole) at the end of each reporting period.

a. Assets and liabilities measured and recorded at fair value on a recurring basis:

	As of December 31, 2020
	Level 1		Level 2		Level 3		Total
	NT$		NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Financial assets:
Financial assets at fair value through profit or loss, current	$	1,049,334	$	2,384	$	164,916	$	1,216,634
Financial assets at fair value through profit or loss, noncurrent		5,546,320		393,856		8,885,911		14,826,087
Financial assets at fair value through other comprehensive income, noncurrent		9,058,372		—		1,467,772		10,526,144
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		2,326		—		2,326

F-121

	As of December 31, 2021
	Level 1		Level 2		Level 3		Total
	NT$		NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Financial assets:
Financial assets at fair value through profit or loss, current	$	761,320	$	—	$	183,701	$	945,021
Financial assets at fair value through profit or loss, noncurrent		9,323,064		497,751		9,680,459		19,501,274
Financial assets at fair value through other comprehensive income, current		8,482,334		—		—		8,482,334
Financial assets at fair value through other comprehensive income, noncurrent		8,849,869		—		2,503,462		11,353,331
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		—		2,380,599		2,380,599

Fair values of financial assets at fair value through profit or loss and financial assets at fair value through other comprehensive income that are categorized into Level 1 are based on the quoted market prices in active markets. If there is no active market, the Company estimates the fair value by using the valuation techniques (income approach and market approach) in consideration of cash flow forecast, recent fund raising activities, valuation of similar companies, individual company’s development, market conditions and other economic indicators. If there are restrictions on the sale or transfer of a financial asset, which are a characteristic of the asset, the fair value of the asset will be determined based on similar but unrestricted financial assets’ quoted market price with appropriate discounts for the restrictions. To measure fair values, if the lowest level input that is significant to the fair value measurement is directly or indirectly observable, then the financial assets are classified as Level 2 of the fair value hierarchy, otherwise as Level 3.

During the years ended December 31, 2020 and 2021, there were no significant transfers between Level 1 and Level 2 fair value measurements.

F-122

Reconciliation for fair value measurement in Level 3 fair value hierarchy were as follows:

	Financial assets at fair value through profit or loss															Financial assets at fair value through other comprehensive income
	Common stock			Preferred stock			Funds			Convertible bonds			Total			Common stock		Preferred stock			Total
	NT$			NT$			NT$			NT$			NT$			NT$		NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)			(In Thousands)
As of January 1, 2020	$	2,880,688		$	3,279,294		$	2,011,025		$	104,708		$	8,275,715		$	1,130,430	$	175,494		$	1,305,924
Recognized in profit (loss)		589,664			180,523			19,611			39,648			829,446			—		—			—
Recognized in other comprehensive income (loss)		—			—			—			—			—			167,197		(5,349	)		161,848
Acquisition		547,932			294,251			340,323			303,456			1,485,962			—		—			—
Disposal		(308,041	)		(374,112	)		—			(227,223	)		(909,376	)		—		—			—
Return of capital		(1,903	)		—			—			—			(1,903	)		—		—			—
Transfer out of Level 3		(428,188	)		—			—			—			(428,188	)		—		—			—
Exchange effect		(38,674	)		(100,953	)		(56,943	)		(4,259	)		(200,829	)		—		—			—
As of December 31, 2020	$	3,241,478		$	3,279,003		$	2,314,016		$	216,330		$	9,050,827		$	1,297,627	$	170,145		$	1,467,772

F-123

	Financial assets at fair value through profit or loss															Financial assets at fair value through other comprehensive income
	Common stock			Preferred stock			Funds			Convertible bonds			Total			Common stock		Preferred stock			Total
	NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)		NT$ (In Thousands)			NT$ (In Thousands)
As of January 1, 2021	$	3,241,478		$	3,279,003		$	2,314,016		$	216,330		$	9,050,827		$	1,297,627	$	170,145		$	1,467,772
Recognized in profit (loss)		278,951			(818,848	)		1,061,793			(6,895	)		515,001			—		—			—
Recognized in other comprehensive income (loss)		—			—			—			—			—			1,053,976		(18,286	)		1,035,690
Acquisition		695,146			829,751			201,649			111,094			1,837,640			—		—			—
Disposal		(447,915	)		(660,904	)		—			(83,814	)		(1,192,633	)		—		—			—
Return of capital		(252	)		—			(69,084	)		—			(69,336	)		—		—			—
Transfer out of Level 3		(161,564	)		—			—			—			(161,564	)		—		—			—
Exchange effect		(21,518	)		(48,756	)		(43,722	)		(1,779	)		(115,775	)		—		—			—
As of December 31, 2021	$	3,584,326		$	2,580,246		$	3,464,652		$	234,936		$	9,864,160		$	2,351,603	$	151,859		$	2,503,462

	Financial liabilities at fair value through profit or loss
	Derivatives
	NT$ (In Thousands)
As of January 1, 2021	$	—
Recognized in profit (loss)		360,494
Issuance		2,020,105
As of December 31, 2021	$	2,380,599

The total profit (loss) of NT$(113) million, NT$721 million and NT$330 million for the years ended December 31, 2019, 2020 and 2021, were included in profit or loss that is attributable to the change in unrealized gains or losses relating to those financial assets without quoted market prices held at the end of the reporting period.

The total loss of nil, nil and NT$360 million for the years ended December 31, 2019, 2020 and 2021, were included in profit or loss that is attributable to the change in unrealized gains or losses relating to those financial liabilities without quoted market prices held at the end of the reporting period.

F-124

The Company’s policy to recognize the transfer into and out of fair value hierarchy levels is based on the event or changes in circumstances that caused the transfer.

Significant unobservable inputs of fair value measurement in Level 3 fair value hierarchy were as follows:

As of December 31, 2020
Category	Valuation technique	Significant unobservable inputs	Quantitative information	Interrelationship between inputs and fair value	Sensitivity analysis of interrelationship between inputs and fair value
Unlisted stock	Market Approach	Discount for lack of marketability	0%-50%	The greater degree of lack of marketability, the lower the estimated fair value is determined.	A change of 5% in the discount for lack of marketability of the aforementioned fair values of unlisted stocks could decrease/increase the Company’s profit (loss) for the year ended December 31, 2020 by NT$283 million and NT$231 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2020 by NT$106 million.

F-125

As of December 31, 2021
Category	Valuation technique	Significant unobservable inputs	Quantitative information	Interrelationship between inputs and fair value	Sensitivity analysis of interrelationship between inputs and fair value
Unlisted stock	Market Approach	Discount for lack of marketability	0%-50%	The greater degree of lack of marketability, the lower the estimated fair value is determined.	A change of 5% in the discount for lack of marketability of the aforementioned fair values of unlisted stocks could decrease/increase the Company’s profit (loss) for the year ended December 31, 2021 by NT$281 million and NT$242 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2021 by NT$186 million.
Embedded derivatives in exchangeable bonds	Binomial tree valuation model	Volatility	45.84%	The higher the volatility, the higher the estimated fair value is determined.	A change of 5% in the volatility could decrease/increase the Company’s profit (loss) for the year ended December 31, 2021 by NT$283 million and NT$278 million, respectively.

b. Assets and liabilities not recorded at fair value but for which fair value is disclosed:

The fair value of bonds payable is estimated by the market price or using a valuation model. The model uses market-based observable inputs including share price, volatility, credit spread and risk-free interest rates. The fair value of long-term loans is determined using discounted cash flow model, based on the Company’s current incremental borrowing rates of similar loans.

F-126

The fair values of the Company’s short-term financial instruments including cash and cash equivalents, receivables, refundable deposits, other financial assets, short-term loans, payables and guarantee deposits approximate their carrying amount due to their maturities within one year.

As of December 31, 2020
		Fair value measurements during reporting period using
Items	Fair value	Level 1	Level 2	Level 3	Carrying amount
	NT$ (In Thousands)	NT$ (In Thousands)	NT$ (In Thousands)	NT$ (In Thousands)	NT$ (In Thousands)

Bonds payables (current portion included)	$	18,861,597	$	18,861,597	$	—	$	—	$	18,690,384
Long-term loans (current portion included)		33,066,106		—		33,066,106		—		33,066,106

As of December 31, 2021
		Fair value measurements during reporting period using
Items	Fair value	Level 1	Level 2	Level 3	Carrying amount
	NT$	NT$	NT$	NT$	NT$
	(In Thousands)	(In Thousands)	(In Thousands)	(In Thousands)	(In Thousands)

Bonds payables (current portion included)	$	41,947,014	$	31,442,469	$	10,504,545	$	—	$	40,536,658
Long-term loans (current portion included)		36,624,907		—		36,624,907		—		36,624,907

12. OPERATING SEGMENT INFORMATION

(1) The Company determined its operating segments based on business activities with discrete financial information regularly reported through the Company’s internal reporting protocols to the Company’s chief operating decision maker. The Company only has wafer fabrication operating segment as the single reporting segment. The primary operating activity of the wafer fabrication segment is the manufacture of chips to the design specifications of our customers by using our own proprietary processes and techniques. The Company maintains a diversified customer base across industries, including communication, consumer electronics, computer, memory and others, while continuing to focus on manufacturing for high growth, large volume applications, including networking, telecommunications, internet, multimedia, PCs and graphics. There was no material difference between the accounting policies of the operating segment and those described in Note 4. Please refer to the Company’s consolidated financial statements for the related segment revenue and operating results.

F-127

(2) Geographic non-current assets information 

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Taiwan	$	64,563,752	$	81,505,018
Singapore		11,621,141		10,610,974
China (includes Hong Kong)		59,643,273		48,667,135
Japan		11,591,851		10,010,255
USA		46,484		24,116
Europe		21,257		18,210
Others		1,126		2,489
Total	$	147,488,884	$	150,838,197

Non-current assets include property, plant and equipment, right-of-use assets, intangible assets, prepayment for equipment and other noncurrent assets.

(3) Major customers

Individual customers accounting for at least 10% of operating revenues for the years ended December 31, 2019, 2020 and 2021 were as follows:

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Customer A from wafer fabrication segment	$	17,576,293	$	20,380,814	$	21,935,208

F-128

13. CAPITAL MANAGEMENT

The primary objective of the Company’s capital management is to ensure that it maintains a strong credit rating and healthy capital ratios to support its business and maximize the shareholders’ value. The Company also ensures its ability to operate continuously to provide returns to shareholders and the interests of other related parties, while maintaining the optimal capital structure to reduce costs of capital.

To maintain or adjust the capital structure, the Company may adjust the dividend payment to shareholders, return capital to shareholders, issue new shares or dispose assets to redeem liabilities.

Similar to its peers, the Company monitors its capital based on debt to capital ratio. The ratio is calculated as the Company’s net debt divided by its total capital. The net debt is derived by taking the total liabilities on the consolidated balance sheets minus cash and cash equivalents. The total capital consists of total equity (including capital, additional paid-in capital, retained earnings, other components of equity and non-controlling interests) plus net debt.

The Company’s strategy, which is unchanged for the reporting periods, is to maintain a reasonable ratio in order to raise capital with reasonable cost. The debt to capital ratios as of December 31, 2020 and 2021 were as follows:

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Total liabilities	$	143,314,539		$	186,580,294
Less: Cash and cash equivalents		(94,048,036	)		(132,622,131	)
Net debt		49,266,503			53,958,163
Total equity		223,139,562			264,375,047
Total capital	$	272,406,065		$	318,333,210
Debt to capital ratios		18.09	%		16.95	%

F-129

EX-8.1

Exhibit 8.1

List of Significant Subsidiaries of United Microelectronics Corporation

Company	Jurisdiction of Incorporation	Percentage of Ownership as of December 31, 2021
UMC Group (USA)	U.S.A		100.00	%
United Microelectronics (Europe) B.V.	The Netherlands		100.00	%
UMC Capital Corp.	Cayman Islands		100.00	%
TLC Capital Co., Ltd.	Taiwan, R.O.C.		100.00	%
Green Earth Limited	Samoa		100.00	%
Fortune Venture Capital Corp.	Taiwan, R.O.C.		100.00	%
UMC Investment (Samoa) Limited	Samoa		100.00	%
ECP Vita Pte. Ltd.	Singapore		100.00	%
Soaring Capital Corp.	Samoa		100.00	%
Unitruth Advisor (Shanghai) Co., Ltd.	China		100.00	%
Tera Energy Development Co., Ltd.	Taiwan, R.O.C.		100.00	%
United Microchip Corporation	Cayman Islands		100.00	%
Wavetek Microelectronics Corporation	Taiwan, R.O.C.		80.37	%
Everrich Energy Investment (HK) Limited	China		100.00	%
Everrich (Shandong) Energy Co., Ltd.	China		100.00	%
Wavetek Microelectronics Investment (Samoa) Limited	Samoa		80.37	%
Wavetek Microelectronics Corporation (USA)	U.S.A.		80.37	%
Best Elite International Limited	British Virgin Islands		100.00	%
Infoshine Technology Limited	British Virgin Islands		100.00	%
Oakwood Associates Limited	British Virgin Islands		100.00	%
Hejian Technology (Suzhou) Co., Ltd.	China		99.9985	%
UnitedDS Semiconductor (Shandong) Co., Ltd.	China		99.9985	%
United Semiconductor (Xiamen) Co., Ltd.	China		69.95	%
UMC Korea Co., Ltd.	Korea		100.00	%
Omni Global Limited	Samoa		100.00	%
United Microtechnology Corporation (California)	U.S.A.		100.00	%
Sino Paragon Limited	Samoa		100.00	%
United Semiconductor Japan Co., Ltd.	Japan		100.00	%

EX-12.1

Exhibit 12.1

CERTIFICATION OF OUR CO-PRESIDENT

I, Jason Wang, certify that:

1. I have reviewed this annual report on Form 20-F of United Microelectronics Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;

4. The company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and

5. The company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of the company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal controls over financial reporting.

Date: April 28, 2022

By:	/s/ Jason Wang
	Name:	Jason Wang
	Title:	Co-president and Director

EX-12.2

Exhibit 12.2

CERTIFICATION OF OUR CO-PRESIDENT

I, Shan-Chieh Chien, certify that:

1. I have reviewed this annual report on Form 20-F of United Microelectronics Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;

4. The company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and

5. The company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of the company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal controls over financial reporting.

Date: April 28, 2022

By:	/s/ Shan-Chieh Chien
	Name:	Shan-Chieh Chien
	Title:	Co-president and Director

EX-12.3

Exhibit 12.3

CERTIFICATION OF OUR CHIEF FINANCIAL OFFICER

I, Chitung Liu, certify that:

1. I have reviewed this annual report on Form 20-F of United Microelectronics Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;

4. The company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and

5. The company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of the company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal controls over financial reporting.

Date: April 28, 2022

By:	/s/ Chitung Liu
	Name:	Chitung Liu
	Title:	Director, Chief Financial Officer and Senior Vice President

EX-13.1

Exhibit 13.1

CERTIFICATION OF PERIODIC FINANCIAL REPORT

Pursuant to 18 U.S.C. Section 1350

In connection with the Annual Report of United Microelectronics Corporation, or the Company, on Form 20-F for the fiscal year ended December 31, 2021 as filed with the Securities and Exchange Commission on the date hereof, or the Report, I, Jason Wang, Co-president of the Company, hereby certify, pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: April 28, 2022

By:	/s/ Jason Wang
	Name:	Jason Wang
	Title:	Co-president and Director

* A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to us and will be retained by us and furnished to the Securities and Exchange Commission or its staff upon request.

EX-13.2

Exhibit 13.2

CERTIFICATION OF PERIODIC FINANCIAL REPORT

Pursuant to 18 U.S.C. Section 1350

In connection with the Annual Report of United Microelectronics Corporation, or the Company, on Form 20-F for the fiscal year ended December 31, 2021 as filed with the Securities and Exchange Commission on the date hereof, or the Report, I, Shan-Chieh Chien, Co-president of the Company, hereby certify, pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: April 28, 2022

By:	/s/ Shan-Chieh Chien
	Name:	Shan-Chieh Chien
	Title:	Co-president and Director

* A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to us and will be retained by us and furnished to the Securities and Exchange Commission or its staff upon request.

EX-13.3

Exhibit 13.3

CERTIFICATION OF PERIODIC FINANCIAL REPORT

Pursuant to 18 U.S.C. Section 1350

In connection with the Annual Report of United Microelectronics Corporation, or the Company, on Form 20-F for the fiscal year ended December 31, 2021 as filed with the Securities and Exchange Commission on the date hereof, or the Report, I, Chitung Liu, Chief Financial Officer of the Company, hereby certify, pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: April 28, 2022

By:	/s/ Chitung Liu
	Name:	Chitung Liu
	Title:	Director, Chief Financial Officer and Senior Vice President

* A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to us and will be retained by us and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Cover	12 Months Ended
	Dec. 31, 2021 shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Registrant Name	United Microelectronics Corporation
Entity Current Reporting Status	Yes
Entity Central Index Key	0001033767
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
ICFR Auditor Attestation Flag	true
Entity Common Stock, Shares Outstanding	12,483,247,566
Entity Shell Company	false
Entity Emerging Growth Company	false
Title of 12(b) Security	American Depositary Shares, each representing 5 Common Shares
Trading Symbol	UMC
Security Exchange Name	NYSE
Entity File Number	001-15128
Entity Incorporation, State or Country Code	F5
Entity Address, Address Line One	No. 3 Li-Hsin Road II
Entity Address, Address Line Two	Hsinchu Science Park
Entity Address, City or Town	Hsinchu City
Entity Address, Country	TW
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Document Registration Statement	false
Document Accounting Standard	International Financial Reporting Standards
Entity Address, Postal Zip Code	11493
Auditor Name	Ernst & Young
Auditor Firm ID	42
Auditor Location	Taipei, Taiwan
Business Contact [Member]
Document Information [Line Items]
Contact Personnel Name	Chitung Liu
Entity Address, Address Line One	8F, No. 68
Entity Address, Address Line Two	Section 1
Entity Address, Address Line Three	Neihu Road
Entity Address, City or Town	Taipei
Entity Address, Country	TW
City Area Code	+886-2
Local Phone Number	2658-9168
Contact Personnel Email Address	ir@umc.com
Entity Address, Postal Zip Code	11493

XML

Consolidated Balance Sheets $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Current assets
Cash and cash equivalents	$ 132,622,131	$ 4,780,899	$ 94,048,036
Financial assets at fair value through profit or loss, current	945,021	34,067	1,216,634
Financial assets at fair value through other comprehensive income, current	8,482,334	305,780
Financial assets measured at amortized cost, current	20,000	721
Contract assets, current	319,621	11,522	257,841
Accounts receivable, net	34,624,109	1,248,165	27,094,355
Accounts receivable-related parties, net	566,338	20,416	178,918
Other receivables	857,233	30,902	1,668,874
Current tax assets	2,597	94	37,598
Inventories, net	23,011,183	829,531	22,552,486
Other current assets	31,822,866	1,147,183	17,251,169
Total current assets	233,273,433	8,409,280	164,305,911
Non-current assets
Financial assets at fair value through profit or loss, noncurrent	19,501,274	703,002	14,826,087
Financial assets at fair value through other comprehensive income, noncurrent	11,353,331	409,277	10,526,144
Investments accounted for under the equity method	28,138,378	1,014,361	20,330,138
Property, plant and equipment	129,941,703	4,684,272	132,774,663
Right-of-use assets	7,126,845	256,916	7,748,042
Intangible assets	3,644,933	131,396	4,877,913
Deferred tax assets	5,478,269	197,486	6,665,976
Prepayment for equipment	8,322,874	300,032	586,333
Refundable deposits	2,358,549	85,023	2,310,961
Other noncurrent assets	1,815,752	65,456	1,501,933
Total non-current assets	217,681,908	7,847,221	202,148,190
Total assets	450,955,341	16,256,501	366,454,101
Current liabilities
Short-term loans	1,924,124	69,363	11,057,132
Financial liabilities at fair value through profit or loss, current	2,380,599	85,818	2,326
Contract liabilities, current	3,441,754	124,072	2,040,989
Notes and accounts payable	8,364,158	301,520	7,862,137
Other payables	21,417,215	772,070	17,877,736
Payables on equipment	7,875,927	283,919	5,448,921
Current tax liabilities	7,049,691	254,134	2,288,582
Lease liabilities, current	557,873	20,111	550,147
Other financial liabilities, current	12,718,616	458,494
Current portion of long-term liabilities	37,331,970	1,345,781	26,985,078
Other current liabilities	5,187,451	187,003	5,368,095
Total current liabilities	108,249,378	3,902,285	79,481,143
Non-current liabilities
Contract liabilities, noncurrent	641,386	23,121	456,480
Bonds payable	23,077,699	831,929	16,690,474
Long-term loans	16,751,896	603,889	8,080,938
Deferred tax liabilities	2,323,917	83,775	1,965,108
Lease liabilities, noncurrent	4,510,881	162,613	5,026,717
Net defined benefit liabilities, noncurrent	3,877,321	139,774	4,162,654
Guarantee deposits	14,261,029	514,096	235,199
Other noncurrent liabilities	12,886,787	464,556	27,215,826
Total non-current liabilities	78,330,916	2,823,753	63,833,396
Total liabilities	186,580,294	6,726,038	143,314,539
Commitments and contingencies
Capital
Common stock	124,832,476	4,500,089	124,224,015
Additional paid-in capital
Premiums	39,889,798	1,437,988	36,809,962
Treasury stock transactions	6,790,108	244,777	4,663,538
Transactions with noncontrolling interests	478,696	17,257	479,236
Share-based payment	2,238,128	80,682	2,259,170
Other	683,866	24,653	241,081
Retained earnings
Legal reserve	15,734,416	567,210	12,536,526
Special reserve	8,164,648	294,328	11,022,314
Unappropriated earnings	83,155,758	2,997,684	53,429,442
Other components of equity
Exchange differences on translation of foreign operations	(16,612,724)	(598,873)	(11,877,253)
Unrealized gains or losses on financial assets measured at fair value through other comprehensive income	9,201,181	331,694	1,327,344
Unearned employee compensation	(2,212,441)	(79,756)	(3,667,395)
Treasury stock	(8,192,044)	(295,315)	(8,421,774)
Total equity attributable to the parent company	264,151,866	9,522,418	223,026,206
Non-controlling interests	223,181	8,045	113,356
Total equity	264,375,047	9,530,463	223,139,562
Total liabilities and equity	$ 450,955,341	$ 16,256,501	$ 366,454,101

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Common stock, par value	$ 10	$ 10
Common stock, shares authorized	26,000,000,000	26,000,000,000
Common stock, shares issued	12,483,248,000	12,422,402,000

XML

Consolidated Statements of Comprehensive Income $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 TWD ($) $ / shares	Dec. 31, 2019 TWD ($) $ / shares
Statement of comprehensive income [abstract]
Operating revenues	$ 213,011,018	$ 7,678,840	$ 176,820,914	$ 148,201,641
Operating costs	(140,961,389)	(5,081,521)	(137,823,813)	(126,886,669)
Gross profit	72,049,629	2,597,319	38,997,101	21,314,972
Operating expenses
Sales and marketing expenses	(4,671,599)	(168,407)	(4,152,242)	(3,807,610)
General and administrative expenses	(7,989,860)	(288,027)	(6,664,166)	(5,318,576)
Research and development expenses	(12,934,836)	(466,288)	(12,895,501)	(11,860,244)
Expected credit impairment (losses) gains	6,121	221	392,145	(627,159)
Subtotal	(25,590,174)	(922,501)	(23,319,764)	(21,613,589)
Net other operating income and expenses	5,226,831	188,422	6,253,890	5,182,162
Operating income	51,686,286	1,863,240	21,931,227	4,883,545
Non-operating income and expenses
Interest income	575,719	20,754	737,913	994,061
Other income	1,653,006	59,589	698,155	711,614
Other gains and losses	866,130	31,223	48,766	1,166,729
Finance costs	(1,962,930)	(70,762)	(2,073,433)	(2,997,643)
Share of profit or loss of associates and joint ventures	5,193,495	187,221	1,300,263	115,329
Bargain purchase gain	0	0	0	171,585
Exchange gain, net	484,726	17,474	0	0
Exchange loss, net	0	0	(100,141)	(238,624)
Subtotal	6,810,146	245,499	611,523	(76,949)
Income from continuing operations before income tax	58,496,432	2,108,739	22,542,750	4,806,596
Income tax expense	(7,918,252)	(285,445)	(1,691,083)	(230,346)
Net income	50,578,180	1,823,294	20,851,667	4,576,250
Items that will not be reclassified subsequently to profit or loss
Remeasurements of defined benefit pension plans	(197,477)	(7,119)	(192,581)	106,403
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income	5,811,342	209,493	4,815,361	5,486,209
Share of other comprehensive income of associates and joint ventures which will not be reclassified subsequently to profit or loss	2,959,130	106,674	883,508	899,025
Income tax related to items that will not be reclassified subsequently	(417,076)	(15,035)	(211,419)	(457,619)
Subtotal	8,155,919	294,013	5,294,869	6,034,018
Items that may be reclassified subsequently to profit or loss
Exchange differences on translation of foreign operations	(4,741,016)	(170,909)	(2,920,280)	(3,277,938)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss	(24,412)	(880)	60,317	15,393
Income tax related to items that may be reclassified subsequently	29,938	1,079	45,913	6,106
Subtotal	(4,735,490)	(170,710)	(2,814,050)	(3,256,439)
Total other comprehensive income, net of tax	3,420,429	123,303	2,480,819	2,777,579
Total comprehensive income	53,998,609	1,946,597	23,332,486	7,353,829
Net income (loss) attributable to:
Shareholders of the parent	51,246,425	1,847,384	22,860,744	8,155,097
Non-controlling interests	(668,245)	(24,090)	(2,009,077)	(3,578,847)
Net income	50,578,180	1,823,294	20,851,667	4,576,250
Total comprehensive income (loss) attributable to:
Shareholders of the parent	54,666,873	1,970,687	25,214,910	10,947,889
Non-controlling interests	(668,264)	(24,090)	(1,882,424)	(3,594,060)
Total comprehensive income	$ 53,998,609	$ 1,946,597	$ 23,332,486	$ 7,353,829
Earnings per share (NTD)
Earnings per share-basic | (per share)	$ 4.27	$ 0.15	$ 1.93	$ 0.71
Earnings per share-diluted | (per share)	$ 4.19	$ 0.15	$ 1.87	$ 0.65

XML

Consolidated Statements of Changes in Equity $ in Thousands, $ in Thousands	TWD ($)	USD ($)	Collected In Advance [member] TWD ($)	Capital [member] Common stock [member] TWD ($)	Additional paid-in capital [member] TWD ($)	Legal Reserve [member] TWD ($)	Special Reserve [member] TWD ($)	Unappropriated Earnings [member] TWD ($)	Exchange Differences on Translation of Foreign Operations [member] TWD ($)	Unrealized Gains or Losses on Financial Assets Measured at Fair Value through Other Comprehensive Income [Member] TWD ($)	Reserve of cash flow hedges [member] TWD ($)	Unearned Employee Compensation [Member] TWD ($)	Treasury Stock [member] TWD ($)	Equity attributable to the parent company [member] TWD ($)	Non-controlling Interests [member] TWD ($)
Balance at Dec. 31, 2018	$ 204,397,483			$ 124,243,187	$ 41,302,035	$ 10,865,280		$ 55,416,447	$ (5,681,389)	$ (8,379,834)	$ (2,058)		$ (13,832,953)	$ 203,930,715	$ 466,768
Impact of retroactive applications at Dec. 31, 2018	(24,362)				(10,427)				(13,935)					(24,362)
Adjusted balance at Dec. 31, 2018	204,373,121			124,243,187	41,291,608	10,865,280		55,416,447	(5,695,324)	(8,379,834)	(2,058)		(13,832,953)	203,906,353	466,768
Appropriation and distribution of retained earnings
Legal reserve						707,299		(707,299)
Special reserve							$ 14,513,940	(14,513,940)
Cash dividends	(6,916,105)							(6,916,105)						(6,916,105)
Net income (loss)	4,576,250							8,155,097						8,155,097	(3,578,847)
Other comprehensive income (loss), net of tax	2,777,579							84,744	(3,241,226)	5,949,274				2,792,792	(15,213)
Total comprehensive income	7,353,829							8,239,841	(3,241,226)	5,949,274				10,947,889	(3,594,060)
Share-based payment transaction	377,004				377,004									377,004
Conversion of convertible bonds	463,415		$ 332,611		130,804									463,415
Treasury stock acquired	(2,859,498)												(2,859,498)	(2,859,498)
Treasury stock cancelled				(7,000,000)	(1,387,127)								8,387,127
Share of changes in net assets of associates and joint ventures accounted for using equity method	14,123				14,123			387,654		(387,654)				14,123
Disposal of subsidiaries
Changes in subsidiaries' ownership	3,639				1,179			(22,280)						(21,101)	24,740
Adjustments due to reciprocal stockholdings held by subsidiaries and associates	32,241				140,909								(108,668)	32,241
Disposal of equity instruments investments measured at fair value through other comprehensive income								(551,903)		551,903
Non-Controlling Interests
Others	72,146				15,458			(3,457,987)			$ 2,058			(3,440,471)	3,512,617
Balance at Dec. 31, 2019	202,913,915		332,611	117,243,187	40,583,958	11,572,579	14,513,940	37,874,428	(8,936,550)	(2,266,311)		$ 0	(8,413,992)	202,503,850	410,065
Appropriation and distribution of retained earnings
Legal reserve						963,947		(963,947)
Cash dividends	(9,765,155)							(9,765,155)						(9,765,155)
Special reserve reversed							(3,491,626)	3,491,626
Net income (loss)	20,851,667							22,860,744						22,860,744	(2,009,077)
Other comprehensive income (loss), net of tax	2,480,819							(157,529)	(2,940,703)	5,452,398				2,354,166	126,653
Total comprehensive income	23,332,486							22,703,215	(2,940,703)	5,452,398				25,214,910	(1,882,424)
Share-based payment transaction	2,639,238			2,000,300	2,628,061							(3,667,395)	1,678,272	2,639,238
Conversion of convertible bonds	6,510,283		(332,611)	4,980,528	1,862,366									6,510,283
Treasury stock acquired	(1,678,272)												(1,678,272)	(1,678,272)
Share of changes in net assets of associates and joint ventures accounted for using equity method	(294)				(294)			33,378		(33,378)				(294)
Disposal of subsidiaries	(51,565)														(51,565)
The differences between the fair value of the consideration paid or received from acquiring or disposing subsidiaries and the carrying amounts of the subsidiaries					(106,879)									(106,879)	106,879
Changes in subsidiaries' ownership	(828,181)				(1,218)			(816,632)						(817,850)	(10,331)
Adjustments due to reciprocal stockholdings held by subsidiaries and associates	184,260				192,042								(7,782)	184,260
Disposal of equity instruments investments measured at fair value through other comprehensive income								1,825,365		(1,825,365)
Non-Controlling Interests	(551,608)														(551,608)
Others	434,455				(705,049)			(952,836)						(1,657,885)	2,092,340
Balance at Dec. 31, 2020	223,139,562		$ 0	124,224,015	44,452,987	12,536,526	11,022,314	53,429,442	(11,877,253)	1,327,344		(3,667,395)	(8,421,774)	223,026,206	113,356
Appropriation and distribution of retained earnings
Legal reserve						3,197,890		(3,197,890)
Cash dividends	(19,875,842)							(19,875,842)						(19,875,842)
Special reserve reversed							(2,857,666)	2,857,666
Net income (loss)	50,578,180	$ 1,823,294						51,246,425						51,246,425	(668,245)
Other comprehensive income (loss), net of tax	3,420,429	123,303						(148,768)	(4,735,471)	8,304,687				3,420,448	(19)
Total comprehensive income	53,998,609	1,946,597						51,097,657	(4,735,471)	8,304,687				54,666,873	(668,264)
Share-based payment transaction	1,745,711			(2,617)	293,374							1,454,954		1,745,711
Share of changes in net assets of associates and joint ventures accounted for using equity method	(540)				(540)			430,850		(430,850)				(540)
Disposal of subsidiaries	0
Changes in subsidiaries' ownership	(1,020,566)							(1,009,440)						(1,009,440)	(11,126)
Adjustments due to reciprocal stockholdings held by subsidiaries and associates	1,070,932				961,003								109,929	1,070,932
Non-Controlling Interests	23,430														23,430
Share exchange	4,661,865			611,078	3,930,986								119,801	4,661,865
Others	631,886				442,786			(576,685)						(133,899)	765,785
Balance at Dec. 31, 2021	$ 264,375,047	$ 9,530,463		$ 124,832,476	$ 50,080,596	$ 15,734,416	$ 8,164,648	$ 83,155,758	$ (16,612,724)	$ 9,201,181		$ (2,212,441)	$ (8,192,044)	$ 264,151,866	$ 223,181

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Consolidated Statements of Cash Flows $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Cash flows from operating activities:
Net income before tax	$ 58,496,432	$ 2,108,739	$ 22,542,750	$ 4,806,596
Adjustments to reconcile net income before tax to net cash provided by operating activities:
Depreciation	44,179,632	1,592,633	46,163,693	47,172,881
Amortization	2,894,942	104,360	2,744,383	2,216,654
Expected credit impairment losses (gains)	(6,121)	(221)	(392,145)	627,159
Net gain of financial assets and liabilities at fair value through profit or loss	(2,892,470)	(104,271)	(2,011,403)	(1,279,931)
Interest expense	1,868,089	67,343	2,004,418	2,933,815
Interest income	(575,719)	(20,754)	(737,913)	(994,061)
Dividend income	(1,653,006)	(59,589)	(698,155)	(711,614)
Share-based payment	1,745,745	62,932	959,219	366,186
Share of profit of associates and joint ventures	(5,193,495)	(187,221)	(1,300,263)	(115,329)
Gain on disposal of property, plant and equipment	(143,735)	(5,182)	(1,137,320)	(43,036)
Loss on disposal of investments	16,388	591	91,070	16,293
Impairment loss on non-financial assets	0	0		118,134
Exchange loss (gain) on financial assets and liabilities	(505,434)	(18,220)	(1,386,657)	206,612
Bargain purchase gain	0	0	0	(171,585)
Loss (gain) on lease modification	6	0	(1,765)
Amortization of deferred government grants	(4,069,055)	(146,685)	(3,994,818)	(4,062,148)
Others	243,447	8,776
Income and expense adjustments	35,909,214	1,294,492	40,302,344	46,280,030
Changes in operating assets and liabilities:
Financial assets and liabilities at fair value through profit or loss	119,904	4,323	876,876	(594,847)
Contract assets	(81,887)	(2,952)	(49,108)	(126,340)
Notes receivable and accounts receivable	(8,590,622)	(309,683)	(1,501,100)	439,400
Other receivables	134,111	4,835	(224,488)	67,347
Inventories	(871,589)	(31,420)	(1,014,039)	(1,370,249)
Other current assets	(227,852)	(8,214)	2,981,984	5,769,041
Contract fulfillment costs	(71,828)	(2,589)	4,200	8,054
Contract liabilities	1,637,105	59,016	1,072,225	69,329
Notes and accounts payable	688,652	24,825	(944,909)	(739,066)
Other payables	4,092,040	147,514	2,247,473	511,244
Other current liabilities	(506,837)	(18,271)	(593,710)	796,243
Net defined benefit liabilities	(482,809)	(17,405)	(55,300)	(35,398)
Other noncurrent liabilities	71,430	2,575	53,743	(3,240)
Cash generated from operations	90,315,464	3,255,785	65,698,941	55,878,144
Interest received	505,379	18,218	758,235	973,241
Dividend received	3,006,829	108,393	1,041,972	818,691
Interest paid	(1,539,069)	(55,482)	(1,735,327)	(2,147,320)
Income tax paid	(1,936,712)	(69,816)	(18,629)	(618,608)
Net cash provided by operating activities	90,351,891	3,257,098	65,745,192	54,904,148
Cash flows from investing activities:
Acquisition of financial assets at fair value through profit or loss	(921,916)	(33,234)	(1,118,572)	(354,249)
Proceeds from disposal of financial assets at fair value through profit or loss	439,145	15,831	326,127	229,553
Proceeds from disposal of financial assets at fair value through other comprehensive income or loss	0	0		44,466
Acquisition of financial assets measured at amortised cost	(20,000)	(721)
Acquisition of investments accounted for under the equity method	0	0	(59,900)	(730,000)
Proceeds from disposal of investments accounted for under the equity method	0	0	30,611	5,970
Increase in prepayment for investments	(5,025)	(181)		(17,974)
Proceeds from capital reduction and liquidation of investments	42,150	1,519	27,200	32,214
Acquisition of subsidiary (net of cash acquired)	0	0		(12,800,981)
Disposal of subsidiary	714,358	25,752	(785,772)	32,017
Acquisition of property, plant and equipment	(48,034,633)	(1,731,602)	(26,345,302)	(16,518,483)
Proceeds from disposal of property, plant and equipment	216,314	7,798	1,737,125	45,042
Increase in refundable deposits	(274,015)	(9,878)	(160,254)	(257,909)
Decrease in refundable deposits	220,750	7,958	448,893	441,013
Acquisition of intangible assets	(1,924,924)	(69,392)	(2,009,031)	(2,443,593)
Government grants related to assets acquisition	2,498,984	90,086	242,264	617,685
Increase in other financial assets	(37,121,310)	(1,338,187)	(18,422,183)
Decrease in other financial assets	22,132,639	797,860	5,984,342
Increase in other noncurrent assets	(125,917)	(4,539)	(7,049)	(15,074)
Decrease in other noncurrent assets	0	0		8,786
Net cash used in investing activities	(62,163,400)	(2,240,930)	(40,111,501)	(31,681,517)
Cash flows from financing activities:
Increase in short-term loans	7,205,015	259,734	16,271,732	25,732,933
Decrease in short-term loans	(16,179,231)	(583,245)	(17,205,124)	(26,726,656)
Cash payments for the principal portion of the lease liability	(699,680)	(25,223)	(726,626)	(633,488)
Proceeds from bonds issued	25,760,800	928,652	0	0
Bonds issuance costs	(57,108)	(2,059)	0	0
Redemption of bonds	(2,000,000)	(72,098)	(13,702,875)	(2,500,000)
Proceeds from long-term loans	15,560,661	560,947	13,528,900	11,449,930
Repayments of long-term loans	(11,472,124)	(413,559)	(13,391,980)	(7,572,939)
Increase in guarantee deposits	14,812,963	533,993	303,720	269,415
Decrease in guarantee deposits	(593,555)	(21,397)	(363,539)	(17,146)
Cash dividends	(19,871,129)	(716,335)	(9,765,694)	(6,911,058)
Treasury stock acquired	0	0	(1,678,272)	(2,972,243)
Treasury stock sold to employees	0	0	1,677,900	0
Change in non-controlling interests	23,430	845	(551,608)	3,388
Others	65	2	2,120	10,818
Net cash provided by (used in) financing activities	12,490,107	450,257	(25,601,346)	(9,867,046)
Effect of exchange rate changes on cash and cash equivalents	(2,104,503)	(75,866)	(1,476,786)	(1,524,847)
Net increase (decrease) in cash and cash equivalents	38,574,095	1,390,559	(1,444,441)	11,830,738
Cash and cash equivalents at beginning of year	94,048,036	3,390,340	95,492,477	83,661,739
Cash and cash equivalents at end of year	$ 132,622,131	$ 4,780,899	$ 94,048,036	$ 95,492,477

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History and Organization

12 Months Ended

Dec. 31, 2021

History And Organization [Abstract]

History and Organization

1. HISTORY AND ORGANIZATION

United Microelectronics Corporation (UMC) was incorporated in Republic of China (R.O.C.) in May 1980 and commenced operations in April 1982. UMC is a full service semiconductor wafer foundry, and provides a variety of services to satisfy customer needs. UMC’s ordinary shares were publicly listed on the Taiwan Stock Exchange (TWSE) in July 1985 and its American Depositary Shares (ADSs) were listed on the New York Stock Exchange (NYSE) in September 2000.

The address of its registered office and principal place of business is No. 3, Li-Hsin Road II, Hsinchu Science Park, Hsinchu City, Taiwan. The principal operating activities of UMC and its subsidiaries (collectively as “the Company”) are described in Notes 4(3) and 12.

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Date and Procedures of Authorization of Financial Statements for Issue

12 Months Ended

Dec. 31, 2021

Disclosure Of Date And Procedures Of Authorization Of Financial Statements For Issue [Abstract]

Date and Procedures of Authorization of Financial Statements for Issue

2. DATE AND PROCEDURES OF AUTHORIZATION OF FINANCIAL STATEMENTS FOR ISSUE

The consolidated financial statements of the Company were approved and authorized for issue by the audit committee of the Board of Directors on April 27, 2022.

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New Accounting Pronouncement under International Financial Reporting Standards (IFRSs)

12 Months Ended

Dec. 31, 2021

Disclosure Of New Accounting Pronouncements Under International Financial Reporting Standards [Abstract]

New Accounting Pronouncement under International Financial Reporting Standards (IFRSs)

3. NEW ACCOUNTING PRONOUNCEMENT UNDER INTERNATIONAL FINANCIAL REPORTING STANDARDS (IFRSs)

(1) The Company applied International Financial Reporting Standards, International Accounting Standards, and Interpretations issued, revised or amended which have been issued by the International Accounting Standards Board (IASB) and become effective for annual periods beginning on or after January 1, 2021. There were no newly adopted or revised standards and interpretations that have material impact on the Company’s financial position and performance.

(2) The Company has not adopted the following new, revised or amended IFRSs that have been issued by the IASB but not yet effective:

New, Revised or Amended Standards and Interpretations	Effective Date issued by IASB
Narrow-scope amendments of IFRS, including Amendments to IFRS 3, Amendments to IAS 16, Amendments to IAS 37	January 1, 2022
Annual Improvements to IFRS Standards 2018 - 2020:	January 1, 2022
Amendments to IFRS 1 “First-time Adoption of International Financial Reporting Standards”
Amendments to IFRS 9 “Financial Instruments”
Amendments to IFRS 16 “Leases”
IFRS 10 “Consolidated Financial Statements” and IAS 28 “Investments in Associates and Joint Ventures” – Sale or Contribution of Assets between an Investor and its Associate or Joint Venture	To be determined by IASB
IFRS 17 “Insurance Contracts”	January 1, 2023
Amendments to IAS 1 “Presentation of Financial Statements” – Classification of Liabilities as Current or Non-current	January 1, 2023
Amendments to IAS 1 “Presentation of Financial Statements” - Disclosure Initiative - Accounting Policies	January 1, 2023
Amendments to IAS 8 “Accounting Policies, Changes in Accounting Estimates and Errors” - Definition of Accounting Estimates	January 1, 2023
Amendment to IAS 12 “Income Taxes” - Deferred Tax related to Assets and Liabilities arising from a Single Transaction	January 1, 2023

(3) The potential effects of adopting the standards or interpretations issued by IASB on the Company’s financial statements in future periods are summarized as below:

a. Narrow-scope amendments of IFRS, including Amendments to IFRS 3, Amendments to IAS 16, Amendments to IAS 37

i. Updating a Reference to the Conceptual Framework (Amendments to IFRS 3)

The amendments updated IFRS 3 by replacing a reference to an old version of the Conceptual Framework for Financial Reporting with a reference to the latest version, which was issued in March 2018. The amendments also added an exception to the recognition principle of IFRS 3 to avoid the issue of potential “day 2” gains or losses arising for liabilities and contingent liabilities. Besides, the amendments clarify existing guidance in IFRS 3 for contingent assets that would not be affected by replacing the reference to the Conceptual Framework.

ii. Property, Plant and Equipment: Proceeds before Intended Use (Amendments to IAS 16)

The amendments prohibit a company from deducting from the cost of property, plant and equipment amounts received from selling items produced while the company is preparing the asset for its intended use. Instead, a company will recognise such sales proceeds and related cost in profit or loss.

iii. Onerous Contracts - Cost of Fulfilling a Contract (Amendments to IAS 37)

The amendments clarify what costs a company should include as the cost of fulfilling a contract when assessing whether a contract is onerous.

b. Annual Improvements to IFRS Standards 2018 – 2020

i. Amendment to IFRS 1 First-time Adoption of International Financial Reporting Standards

The amendment simplifies the application of IFRS 1 by a subsidiary that becomes a first-time adopter after its parent in relation to the measurement of cumulative translation differences.

ii. Amendment to IFRS 9 Financial Instruments (IFRS 9)

The amendment clarifies the fees a company includes when assessing whether the terms of a new or modified financial liability are substantially different from the terms of the original financial liability.

iii. Amendment to Illustrative Examples Accompanying IFRS 16 Leases

The amendment to Illustrative Example 13 accompanying IFRS 16 modifies the treatment of lease incentives relating to lessee’s leasehold improvements.

c. IFRS 10 “Consolidated Financial Statements” (IFRS 10) and IAS 28 “Investments in Associates and Joint Ventures” (IAS 28) - Sale or Contribution of Assets between an Investor and its Associate or Joint Venture (Amendment)

The amendments address the inconsistency between the requirements in IFRS 10 and IAS 28, in dealing with the loss of control of a subsidiary that is contributed to an associate or a joint venture. IAS 28 restricts gains and losses arising from contributions of non-monetary assets to an associate or a joint venture to the extent of the interest attributable to the other equity holders in the associate or joint venture. IFRS 10 requires full profit or loss recognition on the loss of control of a subsidiary. IAS 28 was amended so that the gain or loss resulting from the sale or contribution of assets that constitute a business as defined in IFRS 3 “Business Combinations” (IFRS 3) between an investor and its associate or joint venture is recognized in full.

IFRS 10 was also amended so that the gain or loss resulting from the sale or contribution of a subsidiary that does not constitute a business as defined in IFRS 3 between an investor and its associate or joint venture is recognized only to the extent of the unrelated investors’ interests in the associate or joint venture. The effective date of this amendment has been deferred indefinitely, but early adoption is allowed.

d. IFRS 17 “Insurance Contracts” (IFRS 17)

IFRS 17 provides a comprehensive model for insurance contracts, covering all relevant accounting aspects (including recognition, measurement, presentation and disclosure requirements). The core of IFRS 17 is the General (building block) Model, under this model, on initial recognition, an entity shall measure a group of insurance contracts at the total of the fulfilment cash flows and the contractual service margin. The carrying amount of a group of insurance contracts at the end of each reporting period shall be the sum of the liability for remaining coverage and the liability for incurred claims.

Other than the General Model, the standard also provides a specific adaptation for contracts with direct participation features (the Variable Fee Approach) and a simplified approach (Premium Allocation Approach) mainly for short-duration contracts.

IFRS 17 was issued in May 2017 and it was amended in June 2020 and December 2021. The amendments include deferral of the date of initial application of IFRS 17 by two years to annual beginning on or after 1 January 2023 (from the original effective date of 1 January 2021); provide additional transition reliefs; simplify some requirements to reduce the costs of applying IFRS 17 and revise some requirements to make the results easier to explain. IFRS 17 replaces an interim Standard – IFRS 4 Insurance Contracts – from annual reporting periods beginning on or after 1 January 2023.

e. IAS 1 “Presentation of Financial Statements” (IAS 1)—Classification of Liabilities as Current or Non-current (Amendment)

These are the amendments to paragraphs 69-76 of IAS 1 presentation of financial statements and the amended paragraphs related to the classification of liabilities as current or non-current.

f. IAS 1 “Presentation of Financial Statements” (IAS 1)—Disclosure Initiative—Accounting Policies (Amendment)

The amendments improve accounting policy disclosures that to provide more useful information to investors and other primary users of the financial statements.

g. IAS 8 “Accounting Policies, Changes in Accounting Estimates and Errors” (IAS 8) -Definition of Accounting Estimates (Amendment)

The amendments introduce the definition of accounting estimates and included other amendments to IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors to help companies distinguish changes in accounting estimates from changes in accounting policies.

h. IAS 12 “Income Taxes” (IAS 12)—Deferred Tax related to Assets and Liabilities arising from a Single Transaction (Amendment)

The amendments narrow the scope of the recognition exemption in paragraphs 15 and 24 of IAS 12 so that it no longer applies to transactions that, on initial recognition, give rise to equal taxable and deductible temporary differences.

The Company is currently evaluating the potential impact of the aforementioned standards and interpretations listed (d) - (h) to the Company’s financial position and performance, and the related impact will be disclosed when the evaluation is completed. The rest of the standards listed are not expected to have material impact on the Company’s financial position and performance, except for the following:

The Company expect to apply the amended IAS 37 to contracts which it has not yet fulfilled all its obligation at the beginning of the annual reporting period since 2022 (the date of initial application). The adoption of the amendments has no material impact on the Company. The cumulative effect of initially applying the amendments will be recognized as adjustments to the provisions (classified under other current liabilities), retained earnings and non-controlling interests, respectively at the date of initial application.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2021

Disclosure Of Summary Of Significant Accounting Policies [Abstract]

Summary of Significant Accounting Policies

4. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

(1) Statement of Compliance

The Company’s consolidated financial statements were prepared in accordance with IFRSs, including International Financial Reporting Standards, International Accounting Standards, IFRIC Interpretations and SIC Interpretations, as issued by IASB.

(2) Basis of Preparation

The consolidated financial statements have been prepared on a historical cost basis, except for financial instruments measured at fair value.

(3) General Description of Reporting Entity

a. Principles of consolidation

Subsidiaries are fully consolidated from the date of acquisition (the date on which the Company obtains control), and continue to be consolidated until the date that such control ceases. The Company controls an entity when the Company is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of the subsidiaries are prepared for the same reporting period as the parent company, using consistent accounting policies. All intra-group balances, transactions, unrealized gains and losses and dividends resulting from intra-group transactions are eliminated in full.

A change in the ownership interest of a subsidiary, without a change of control, is accounted for as an equity transaction. Total comprehensive income of subsidiaries is attributed to the shareholders of the parent and to the non-controlling interests even if this results in the non-controlling interests having a deficit balance.

If the Company loses control over a subsidiary, the Company derecognizes the assets and liabilities of the subsidiary, as well as any non-controlling interests previously recorded by the Company. A gain or loss is recognized in profit or loss and is calculated as the difference between: (a) the aggregate of the fair value of consideration received and the fair value of any retained interest at the date when control is lost; and (b) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling interests. Any gain or loss previously recognized in the other comprehensive income would be reclassified to profit or loss or transferred directly to retained earnings if required by other IFRSs. The fair value of any investment retained in the former subsidiary at the date when control is lost is regarded as the cost on initial recognition of an investment.

b. The consolidated entities as of December 31, 2020 and 2021 were as follows:

			Percentage of ownership (%) as of December 31,
Investor	Subsidiary	Business nature	2020		2021
UMC	UMC GROUP (USA)	IC Sales		100.00		100.00
UMC	UNITED MICROELECTRONICS (EUROPE) B.V.	Marketing support activities		100.00		100.00
UMC	UMC CAPITAL CORP.	Investment holding		100.00		100.00
UMC	GREEN EARTH LIMITED (GE)	Investment holding		100.00		100.00
UMC	TLC CAPITAL CO., LTD. (TLC)	Venture capital		100.00		100.00
UMC	UMC INVESTMENT (SAMOA) LIMITED	Investment holding		100.00		100.00
UMC	FORTUNE VENTURE CAPITAL CORP. (FORTUNE)	Consulting and planning for venture capital		100.00		100.00
UMC	UMC KOREA CO., LTD.	Marketing support activities		100.00		100.00
UMC	OMNI GLOBAL LIMITED (OMNI)	Investment holding		100.00		100.00
UMC	SINO PARAGON LIMITED	Investment holding		100.00		100.00
UMC	BEST ELITE INTERNATIONAL LIMITED (BE)	Investment holding		100.00		100.00
UMC	UNITED SEMICONDUCTOR JAPAN CO., LTD.	Sales and manufacturing of integrated circuits		100.00		100.00
UMC and FORTUNE	WAVETEK MICROELECTRONICS CORPORATION (WAVETEK)	Sales and manufacturing of integrated circuits		81.40		80.37
TLC	SOARING CAPITAL CORP.	Investment holding		100.00		100.00

			Percentage of ownership (%) as of December 31,
Investor	Subsidiary	Business nature	2020		2021
SOARING CAPITAL CORP.	UNITRUTH ADVISOR (SHANGHAI) CO., LTD.	Investment holding and advisory		100.00		100.00
GE	UNITED MICROCHIP CORPORATION	Investment holding		100.00		100.00
FORTUNE	TERA ENERGY DEVELOPMENT CO., LTD. (TERA ENERGY)	Energy technical services		100.00		100.00
TERA ENERGY	EVERRICH ENERGY INVESTMENT (HK) LIMITED (EVERRICH-HK)	Investment holding		100.00		100.00
EVERRICH-HK	EVERRICH (SHANDONG) ENERGY CO., LTD.	Solar engineering integrated design services		100.00		100.00
OMNI	UNITED MICROTECHNOLOGY CORPORATION (CALIFORNIA)	Research and development		100.00		100.00
OMNI	ECP VITA PTE. LTD.	Insurance		100.00		100.00
OMNI	UMC TECHNOLOGY JAPAN CO., LTD.	Semiconductor manufacturing technology development and consulting services		100.00		—
WAVETEK	WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA)	Investment holding		100.00		100.00
WAVETEK-SAMOA	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		100.00		100.00
BE	INFOSHINE TECHNOLOGY LIMITED (INFOSHINE)	Investment holding		100.00		100.00
INFOSHINE	OAKWOOD ASSOCIATES LIMITED (OAKWOOD)	Investment holding		100.00		100.00
OAKWOOD	HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ)	Sales and manufacturing of integrated circuits		99.9985		99.9985
HJ	UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS)	Integrated circuits design services		100.00		100.00
UNITED MICROCHIP CORPORATION and HJ	UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM)	Sales and manufacturing of integrated circuits		67.76		69.95

(4) Business Combinations and Goodwill

Business combinations are accounted for using the acquisition method. The consideration transferred, the identifiable assets acquired and liabilities assumed are measured at the acquisition date fair value. For the components of non-controlling interests in the acquiree that are present ownership interests and entitle their holders to a proportionate share of the entity’s net assets in the event of liquidation, the acquirer measures at either fair value or at the non-controlling interest’s proportionate share of the acquiree’s identifiable net assets. Acquisition-related costs are expensed as incurred and are classified under administrative expenses.

When the Company acquires a business, it assesses the assets acquired and liabilities assumed for appropriate classification and designation in accordance with the contractual terms, economic circumstances and pertinent conditions as at the acquisition date.

If the business combination is achieved in stages, the acquisition date fair value of the acquirer’s previously held equity interest in the acquiree is remeasured at fair value as at the acquisition date through profit or loss.

Any contingent consideration to be transferred by the acquirer will be recognized at fair value at the acquisition date. Subsequent changes to the fair value of the contingent consideration which is deemed to be an asset or liability, will be recognized in accordance with IFRS 9, either in profit or loss or other comprehensive income. If the contingent consideration is classified as equity, it should not be remeasured until it is finally settled within equity.

Goodwill is initially measured at cost, being the excess of the aggregate of the consideration transferred, the acquisition date fair value of the acquirer’s previously held equity interest in the acquiree and the amount recognized for non-controlling interest over the net identifiable assets acquired and liabilities assumed. If the fair value of the net assets acquired is in excess of the aggregate consideration transferred and non-controlling interests, the difference is recognized as a gain on bargain purchase.

After initial recognition, goodwill is measured at cost less any accumulated impairment losses. For the purpose of impairment testing, goodwill acquired in a business combination is, from the acquisition date, allocated to each cash-generating unit (CGU) that is expected to benefit from the combination, irrespective of whether other assets or liabilities of the acquiree are assigned to those units. Each unit or groups of units to which the goodwill is so allocated represents the lowest level within the Company at which the goodwill is monitored for internal management purposes and cannot be larger than an operating segment before aggregation.

Where goodwill forms part of a CGU and part of the operation within that unit is disposed, the goodwill associated with the operation disposed is included in the carrying amount of the operation. Goodwill disposed in this circumstance is measured based on the relative values of the operation disposed and the portion of the CGU retained.

(5) Foreign Currency Transactions

The Company’s consolidated financial statements are presented in New Taiwan Dollars (NTD), which is also the parent company’s functional currency. Each entity in the Company determines its own functional currency and items included in the financial statements of each entity are measured using that functional currency.

Transactions in foreign currencies are initially recorded by the Company’s entities at their respective functional currency rates prevailing at the transaction date. Monetary assets and liabilities denominated in foreign currencies are translated into functional currency at the closing rates of exchange at the reporting date. Non-monetary items measured at fair value in foreign currencies are translated using the exchange rates at the date when the fair value is determined. Non-monetary items that are measured at historical cost in foreign currencies are translated using the exchange rates as at the dates of the initial transactions.

All exchange differences arising on the settlement of monetary items or on translating monetary items are taken to profit or loss in the period in which they arise except for the following:

a. Exchange differences arising from foreign currency borrowings for an acquisition of a qualifying asset to the extent that they are regarded as an adjustment to interest costs are included in the borrowing costs that are eligible for capitalization.

b. Foreign currency derivatives within the scope of IFRS 9 are accounted for based on the accounting policy for financial instruments.

c. Exchange differences arising on a monetary item that is part of a reporting entity’s net investment in a foreign operation are recognized initially in other comprehensive income and reclassified from equity to profit or loss upon disposal of such investment.

When a gain or loss on a non-monetary item is recognized in other comprehensive income, any exchange component of that gain or loss is recognized in other comprehensive income. When a gain or loss on a non-monetary item is recognized in profit or loss, any exchange component of that gain or loss is recognized in profit or loss.

(6) Translation of Foreign Currency Financial Statements

The assets and liabilities of foreign operations are translated into NTD at the closing rate of exchange prevailing at the reporting date and their income and expenses are translated at an average exchange rate for the period. The exchange differences arising on the translation are recognized in other comprehensive income. On disposal of a foreign operation, the cumulative amount of the exchange differences relating to that foreign operation, recognized in other comprehensive income and accumulated in the separate component of equity, is reclassified from equity to profit or loss when the gain or loss on disposal is recognized.

On partial disposal of a subsidiary that includes a foreign operation that does not result in a loss of control, the proportionate share of the cumulative amount of the exchange differences recognized in other comprehensive income is re-attributed to the non-controlling interests in that foreign operation. On partial disposal of an associate or a joint venture that includes a foreign operation that does not result in a loss of significant influence or joint control, only the proportionate share of the cumulative amount of the exchange differences recognized in other comprehensive income is reclassified to profit or loss.

Any goodwill and any fair value adjustments to the carrying amounts of assets and liabilities arising from the acquisition of a foreign operation are treated as assets and liabilities of the foreign operation and expressed in its functional currency.

(7) Convenience Translation into U.S. Dollars

Translations of amounts from NTD into U.S. dollars (USD) for the reader’s convenience were calculated at the rate of USD1.00 to NTD27.74 on December 30, 2021 released by Board of Governors of the Federal Reserve System. No representation is made that the NTD amounts could have been, or could be, converted into USD at this rate.

(8) Current and Non-Current Distinction

An asset is classified as current when:

a. the Company expects to realize the asset, or intends to sell or consume it, in its normal operating cycle;

b. the Company holds the asset primarily for the purpose of trading;

c. the Company expects to realize the asset within twelve months after the reporting period; or

d. the asset is cash or a cash equivalent unless the asset is restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period.

All other assets are classified as non-current.

A liability is classified as current when:

a. the Company expects to settle the liability in normal operating cycle;

b. the Company holds the liability primarily for the purpose of trading;

c. the liability is due to be settled within twelve months after the reporting period; or

d. the Company does not have an unconditional right to defer settlement of the liability for at least twelve months after the reporting date. Terms of a liability that could, at the option of the counterparty, result in its settlement by the issue of equity instruments do not affect its classification.

All other liabilities are classified as non-current.

(9) Cash Equivalents

Cash equivalents are short-term, highly liquid investments that are readily convertible to known amounts of cash and with maturity dates that do not present significant risks of changes in value resulting from changes in interest rates, including time deposits with original maturities of three months or less and repurchase agreements collateralized by government bonds and corporate bonds.

(10) Financial Instruments

Financial assets and financial liabilities are recognized when the Company becomes a party to the contractual provisions of the instrument. Purchase or sale of financial assets and liabilities are recognized using trade date accounting. All financial assets are recognized initially at fair value plus, in the case of investments not at fair value through profit or loss, directly attributable costs. Financial assets at fair value through profit or loss are initially recognized at fair value, and transaction costs are expensed in the statement of comprehensive income.

Financial Assets

a. Classification and subsequent measurement

The Company determines the classification of its financial assets at initial recognition. In accordance with IFRS 9, financial assets of the Company are classified as financial assets at fair value through profit or loss, financial assets at fair value through other comprehensive income, and financial assets measured at amortized cost.

i. Financial assets at fair value through profit or loss

Financial assets that are not measured at amortized cost or at fair value through other comprehensive income are recognized initially at fair value and subsequently measured at fair value with changes in fair value recognized in profit or loss.

ii. Financial assets at fair value through other comprehensive income

At initial recognition, the Company may make an irrevocable election to present in other comprehensive income subsequent changes in the fair value of an investment in an equity instrument that is not held for trading. When there is a disposal of such equity instrument, accumulated amounts presented in other comprehensive income are not subsequently transferred to profit or loss but are transferred directly to the retained earnings.

The debt instruments are measured at fair value through other comprehensive income if both of the following conditions are met:

(i) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and

(ii) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding.

Subsequent changes in the fair value of such financial assets at fair value through other comprehensive income are recognized in other comprehensive income. Before derecognition, impairment gains or losses, interest revenue and foreign exchange gains and losses are recognized in profit or loss. When the financial assets are derecognized the cumulative gain or loss previously recognized in other comprehensive income is reclassified from other comprehensive income to profit or loss as a reclassification adjustment.

iii. Financial assets measured at amortized cost

The financial assets are measured at amortized cost (including cash and cash equivalent, notes, accounts and other receivables and other financial assets) if both of the following conditions are met.

(i) the financial asset is held within a business model whose objective is to hold financial assets in order to collect contractual cash flows; and

(ii) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding.

Subsequent to initial recognition for financial assets measured at amortized cost, interest income, measured by the effective interest method amortization process, and impairment losses are recognized during circulation period. Gains and losses are recognized in profit or loss when the financial assets are derecognized.

b. Derecognition of financial assets

A financial asset is derecognized when:

i. the contractual rights to receive cash flows from the asset have expired;

ii. the Company has transferred assets and substantially all the risks and rewards of the asset have been transferred; or

iii. the Company has neither transferred nor retained substantially all the risks and rewards of the asset, but has transferred control of the asset.

On derecognition of a financial asset in its entirety, the difference between the carrying amount and the consideration received or to be received including any cumulative gain or loss that had been recognized in other comprehensive income is recognized in profit or loss (for debt instruments) or directly in retained earnings (for equity instruments).

If the transferred asset is part of a larger financial asset and the part transferred qualifies for derecognition in its entirety, the Company allocates the previous carrying amount of the larger financial asset between the part that continues to be recognized and the part that is derecognized, based on the relative fair values of those parts on the date of the transfer. Any cumulative gain or loss that had been recognized in other comprehensive income is allocated between the part that continues to be recognized and the part that is derecognized, based on the relative fair values of those parts. The difference between the carrying amount allocated to the part derecognized and the sum of the consideration received for the part derecognized and any cumulative gain or loss allocated that had been recognized in other comprehensive income, is recognized in profit or loss or directly in retained earnings.

c. Impairment policy

The Company measures, at each reporting date, an allowance for expected credit losses (ECLs) for debt instrument investments measured at fair value through other comprehensive income and financial assets measured at amortized cost by assessing reasonable and supportable information including forward-looking information. Where the credit risk on a financial asset has not increased significantly since initial recognition, the loss allowance is measured at an amount equal to 12-month ECLs. Where the credit risk on a financial asset has increased significantly since initial recognition, the loss allowance is measured at an amount equal to the lifetime ECLs.

For notes, accounts receivable and contract assets, the Company applies a simplified approach in calculating ECLs. Therefore, the Company does not track changes in credit risk, but instead recognizes a loss allowance based on lifetime ECLs at each reporting date. ECLs are measured based on the Company’s historical credit loss experience and customers’ current financial condition, adjusted for forward-looking factors, such as customers’ economic environment.

Financial Liabilities

a. Classification and subsequent measurement

The Company classifies the instrument issued as a financial liability or an equity instrument in accordance with the substance of the contractual arrangement and the definitions of a financial liability and an equity instrument.

i. Financial liabilities at fair value through profit or loss

Financial liabilities at fair value through profit or loss include financial liabilities held for trading and financial liabilities designated upon initial recognition as at fair value through profit or loss. Excluding changes in own credit risk, gains or losses on the subsequent measurement including interest paid are recognized in profit or loss.

ii. Financial liabilities measured at amortized cost

Financial liabilities measured at amortized cost include interest bearing loans and borrowings that are subsequently measured using the effective interest method after initial recognition. Gains and losses are recognized in profit or loss when the liabilities are derecognized as well as through the effective interest method amortization process.

Amortized cost is calculated by taking into account any discount or premium on acquisition and fees or transaction costs.

b. Derecognition of financial liabilities

A financial liability is derecognized when the obligation under the liability is discharged, cancelled or expires.

When an existing financial liability is replaced by another from the same lender on substantially different terms, or the terms of an existing liability are substantially modified (whether or not attributable to the financial difficulty of the debtor), such an exchange or modification is treated as a derecognition of the original liability and the recognition of a new liability, and the difference in the respective carrying amounts and the consideration paid, including any non-cash assets transferred or liabilities assumed, is recognized in profit or loss.

(11) Hedge Accounting

Cash flow hedges

The Company manages exposures arising from foreign currency exchange risk. With the adoption of IFRS 9, the Company designates a hedging relationship between the hedging instrument and the hedged item with the existence of an economic relationship and determines the hedge ratio to meet the hedge effectiveness. The Company designates certain hedging instruments to partially hedge the foreign currency exchange rate risks associated with certain highly probable forecast transactions. The separate component of equity associated with the hedged item is adjusted to the lower of the following (in absolute amounts):

a. the cumulative gain or loss on the hedging instrument from inception of the hedge; and

b. the cumulative change in fair value (present value) of the expected future cash flows on the hedged item from inception of the hedge.

The portion of the gain or loss on the hedging instrument that is determined to be an effective hedge is recognized in other comprehensive income, whereas the ineffective portion of the change in the fair value of the hedging instrument is recognized directly in profit or loss. If a hedge of a forecast transaction subsequently results in the recognition of a non-financial asset or a non-financial liability, the associated gains or losses that were recognized in other comprehensive income are included in the initial cost of the asset or liability.

The Company prospectively discontinues hedge accounting only when the hedging relationship ceases to meet the qualifying criteria; for instance when the hedging instrument expires or is sold, terminated or exercised.

(12) Inventories

Inventories are accounted for on a perpetual basis. Raw materials are stated at actual purchase costs, while the work in process and finished goods are stated at standard costs and subsequently adjusted to weighted-average costs at the end of each month. The cost of work in progress and finished goods comprises raw materials, direct labor, other direct costs and related production overheads. Allocation of fixed production overheads to the costs of conversion is based on the normal capacity of the production facilities. Cost associated with underutilized capacity is expensed as incurred. Inventories are valued at the lower of cost and net realizable value item by item. Net realizable value is the estimated selling price in the ordinary course of business less the estimated costs of completion and the estimated costs necessary to make the sale.

(13) Investments Accounted for Under the Equity Method

The Company’s investments in associates and joint ventures are accounted for using the equity method other than those that meet the criteria to be classified as non-current assets held for sale.

An associate is an entity over which the Company has significant influence and that is neither a subsidiary nor a joint venture. Significant influence is the power to participate in the financial and operating policy decisions of an entity, but is not control or joint control over those policies.

A joint venture is a type of joint arrangement whereby the Company that has joint control of the arrangement has rights to the net assets of the joint venture. Joint control is the contractually agreed sharing of control of an arrangement where no single party controls the arrangement on its own, which exists only when decisions about the relevant activities require unanimous consent of the parties sharing control.

Any difference between the acquisition cost and the Company’s share of the net fair value of the identifiable assets and liabilities of associates and joint ventures is accounted for as follows:

a. Any excess of the acquisition cost over the Company’s share of the net fair value of the identifiable assets and liabilities of an associate or a joint venture at the date of acquisition is recognized as goodwill and is included in the carrying amount of the investment. Amortization of goodwill is not permitted.

b. Any excess of the Company’s share of the net fair value of the identifiable assets and liabilities of an associate or a joint venture over the acquisition cost, after reassessing the fair value, is recognized as a gain in profit or loss on the acquisition date.

Under the equity method, the investments in associates and joint ventures are carried on the balance sheet at cost plus post acquisition changes in the Company’s share of profit or loss and other comprehensive income of associates and joint ventures. The Company’s share of changes in associates’ and joint ventures’ profit or loss and other comprehensive income are recognized directly in profit or loss and other comprehensive income, respectively. Distributions received from an associate or a joint venture reduce the carrying amount of the investment. Any unrealized gains and losses resulting from transactions between the Company and the associate or the joint venture are eliminated to the extent of the Company’s interest in the associate or the joint venture.

Financial statements of associates and joint ventures are prepared for the same reporting period as the Company. Where necessary, adjustments are made to bring the accounting policies in line with those of the Company.

Upon an associate’s issuance of new shares, if the Company takes up more shares than its original proportionate holding while maintaining its significant influence over that associate, such increase would be accounted for as an acquisition of an additional equity interest in the associate. Upon an associate’s issuance of new shares, if the Company does not take up proportionate shares resulting in decrease in its stockholding percentage while maintaining its significant influence over that associate, the Company treats the transaction as deemed disposal and reclassifies to profit or loss or other appropriate account(s) the proportion of the gain or loss previously recognized in other comprehensive income relating to that reduction in ownership interest.

The Company ceases to use the equity method upon loss of significant influence over an associate. Any difference between the carrying amount of the investment in an associate upon loss of significant influence and the fair value of the retained investment plus proceeds from disposal will be recognized in profit or loss. If an investment in an associate becomes an investment in a joint venture or an investment in a joint venture becomes an investment in an associate, the Company continues to apply the equity method and does not remeasure the retained interest.

The Company determines at each reporting date whether there is any objective evidence that the investments in associates and joint ventures are impaired. An impairment loss, being the difference between the recoverable amount of the associate or joint venture and its carrying amount, is recognized in profit or loss in the statement of comprehensive income and forms part of the carrying amount of the investments.

(14) Property, Plant and Equipment

Property, plant and equipment are stated at cost, net of accumulated depreciation and accumulated impairment losses, if any, and any borrowing costs incurred for long-term construction projects are capitalized if the recognition criteria are met. Significant renewals, improvements and major inspections meeting the recognition criteria are treated as capital expenditures, and the carrying amounts of those replaced parts are derecognized. Maintenance and repairs are recognized in expenses as incurred. Any gain or loss arising from derecognition of the assets is recognized in other operating income and expenses.

Depreciation is calculated on a straight-line basis over the estimated useful lives. A significant part of an item of property, plant and equipment which has a different useful life from the remainder of the item is depreciated separately.

The depreciation methods, useful lives and residual values for the assets are reviewed at each fiscal year end, and the changes from the previous estimation are recorded as changes in accounting estimates.

Except for land, which is not depreciated, the estimated useful lives of the assets are as follows:

Buildings	7-56 years
Machinery and equipment	6-7 years
Transportation equipment	6-7 years
Furniture and fixtures	3-7 years
Leasehold improvement	The shorter of lease terms or useful lives

(15) Lease

A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange of consideration, and to obtain substantially all economic benefits from use of the identified asset. The Company accounts for a lease contract as a single lease and separates the lease and non-lease components included in the contract.

The Company as a lessor

The Company recognizes lease payments from operating leases as rental income on a straight-line basis over the term of the lease.

The Company as a lessee

At the commencement date of a lease, a lessee is required to recognize right-of-use assets and lease liabilities, except for short-term leases and low-value asset leases.

a. At the commencement date, lease liabilities should be recognized and measured at the present value of the lease payments that have not been paid at that date, using the Company’s incremental borrowing rate. The payments comprise:

i. fixed payments less any lease incentives receivable;

ii. variable lease payments that depend on an index or rate;

iii. amounts expected to be payable by the Company under residual value guarantees;

iv. the exercise price of a purchase option if the Company is reasonably certain to exercise; and

v. payments for terminating the lease unless it is reasonably certain that early termination will not occur.

Lease liabilities are measured in subsequent periods using the effective interest method, and the interest expenses are recognized over the lease terms. In addition, the carrying amount of lease liabilities is remeasured if there is a modification which is not accounted as a separate lease, a change in the lease term, a change in the lease payments (e.g., changes to future payments resulting from a change in an index or rate used to determine such lease payments) or a change in the assessment of an option to purchase the underlying asset.

b. At the commencement date, the right-of-use assets should be measured at cost, which comprise of:

i. the amount of the initial measurement of the lease liabilities;

ii. any lease payments made at or before the commencement date; and

iii. any initial direct costs incurred.

Subsequent to initial recognition, the right-of-use assets are measured using cost model. Right-of-use assets measured under the cost model are depreciated from the commencement date to the earlier of the end of the useful life of the right-of-use assets or the end of the lease terms. Any remeasurement of the lease liabilities results in a corresponding adjustment of the right-of-use assets.

The Company presents right-of-use assets and lease liabilities on the balance sheets, and depreciation expenses and interest expenses are separately presented in the statements of comprehensive income. The Company recognizes the lease payments associated with short-term leases and low-value asset leases as expenses on a straight-line basis over the lease terms.

(16) Intangible Assets

Intangible assets acquired separately are measured on initial recognition at cost. The cost of intangible assets acquired in a business combination is its fair value as at the date of acquisition. Following initial recognition, intangible assets are carried at cost less any accumulated amortization and accumulated impairment losses, if any. Internally generated intangible assets which fail to meet the recognition criteria are not capitalized and the expenditures are reflected in profit or loss in the period incurred.

The useful lives of intangible assets are assessed as either finite or indefinite.

Intangible assets with finite useful lives are amortized over the useful lives and assessed for impairment whenever there is an indication that the intangible assets may be impaired. The amortization period and the amortization method for an intangible asset with a finite useful life are reviewed at least at the end of each fiscal year. Changes in the expected useful life or the expected pattern of consumption of future economic benefits embodied in the asset is accounted for by changing the amortization period or method, as appropriate, and is treated as changes in accounting estimates.

Intangible assets with indefinite useful lives are not amortized, but are tested for impairment annually, either individually or at the CGU level. The assessment of indefinite useful life is reviewed annually to determine whether the indefinite useful life continues to be supportable. If not, the change in useful life from indefinite to finite is made on a prospective basis.

Gains or losses arising from derecognition of an intangible asset are recognized in other operating income and expenses.

Accounting policies of the Company’s intangible assets are summarized as follows:

a. Goodwill arising from business combinations is not amortized, and is tested for impairment annually or more frequently if events or changes in circumstances suggest that the carrying amount may not be recoverable. If an event occurs or circumstances change which indicates that the goodwill is impaired, an impairment loss is recognized. Goodwill impairment losses cannot be reversed once recognized.

b. Software is amortized over the contract term or estimated useful life (3-6 years) on a straight-line basis.

c. Patent and technology license fee: Upon signing of contract and obtaining the right to intellectual property, any portion attributable to non-cancellable and mutually agreed future fixed license fees for patent and technology is discounted and recognized as an intangible asset and related liability. The cost of the intangible asset is not revalued once determined on initial recognition, and is amortized over the useful life (5-10 years) on a straight-line basis. Interest expenses from the related liability are recognized and calculated based on the effective interest method. Based on the timing of payments, the liability is classified as current and non-current.

d. Others are mainly the intellectual property license fees, amortized over the shorter of the contract term or estimated useful life (3 years) of the related technology on a straight-line basis.

(17) Impairment of Non-Financial Assets

The Company assesses at each reporting date whether there is an indication that an asset in the scope of IAS 36 “Impairment of Assets” may be impaired. If any indication exists, the Company completes impairment testing for the CGU to which the individual assets belong. Where the carrying amount of an asset or CGU exceeds its recoverable amount, the asset is considered impaired and is written down to its recoverable amount. The recoverable amount of an individual asset or a CGU is the higher of its fair value less costs of disposal and its value in use. If circumstances indicate that previously recognized impairment losses may no longer exist or may have decreased at each reporting date, the Company re-assesses the asset’s or CGU’s recoverable amount. A previously recognized impairment loss is reversed only if there has been an increase in the estimated service potential of an asset which in turn increases the recoverable amount since the last impairment loss was recognized. The reversal is limited so that the carrying amount of the asset does not exceed its recoverable amount, nor exceed the carrying amount that would have been determined, net of depreciation or amortization, had no impairment loss been recognized for the asset in prior years.

A CGU, or group of CGUs, to which goodwill has been allocated is tested for impairment annually at the same time every year, irrespective of whether there is any indication of impairment. Where the carrying amount of a CGU (including the carrying amount of goodwill) exceeds its recoverable amount, the CGU is considered impaired. If an impairment loss is to be recognized, it is first allocated to reduce the carrying amount of any goodwill allocated to the CGU (group of units), then to the other assets of the unit (group of units) pro rata on the basis of the carrying amount of each asset in the unit (group of units). Impairment losses relating to goodwill cannot be reversed in future periods.

The recognition or reversal of impairment losses is classified as other operating income and expenses.

(18) Bonds

Convertible bonds

UMC evaluates the terms of the convertible bonds issued to determine whether it contains both a liability and an equity component. Furthermore, UMC assesses if the economic characteristics and risks of the put and call options embedded in the convertible bonds are closely related to the economic characteristics and risk of the host contract before separating the equity element.

For the liability component excluding the derivatives, its fair value is determined based on the effective interest rate applied at that time by the market to instruments of comparable credit status. The liability component is classified as a financial liability measured at amortized cost using the effective interest method before the instrument is converted or settled. For the embedded derivative that is not closely related to the host contract, it is classified as a liability component and subsequently measured at fair value through profit or loss unless it qualifies as an equity component. The equity component is recognized initially at the difference between the fair value of the compound financial instrument as a whole and the fair value of the liability component. Its carrying amount is not remeasured in the subsequent accounting periods. If the convertible bond issued does not have an equity component, it is accounted for as a hybrid instrument in accordance with the requirements under IFRS 9.

If the convertible bondholders exercise their conversion right before maturity, UMC shall adjust the carrying amount of the liability component. The adjusted carrying amount of the liability component at conversion and the carrying amount of equity component are credited to common stock and additional paid-in capital-premiums. No gain or loss is recognized upon bond conversion.

In addition, the liability component of convertible bonds is classified as a current liability if within 12 months the bondholders may exercise the put right. After the put right expires, the liability component of the convertible bonds should be reclassified as a non-current liability if it meets the definition of a non-current liability in all other respects.

Exchangeable bonds

In accordance with IFRS 9, if the economic characteristics and risks of the embedded derivative are not closely related to the economic characteristics and risks of the host, the derivative financial instruments embedded in exchangeable bonds would be separated from the host and accounted for as financial assets or liabilities at fair value through profit or loss.

UMC has issued exchangeable bonds where the bondholders may exchange the bonds into ordinary shares of certain public entities which UMC holds as financial assets (“reference shares”). When exchangeable bondholders exercise their right to exchange their bonds for reference shares, the carrying amount of the bonds and the related assets or liabilities accounts will be derecognized, and the difference will be recognized in profit or loss.

Both the host and embedded derivative financial instrument in exchangeable bonds are classified as current liabilities as the bondholders have the right to demand settlement by exercising the exchange option of the bonds within 12 months.

(19) Post-Employment Benefits

Under defined contribution pension plans, the contribution payable to the plan in exchange for the service rendered by an employee during a period shall be recognized as an expense. The contribution payable, after deducting any amount already paid, is recognized as a liability.

Under defined benefit pension plans, the net defined benefit liability (asset) shall be recognized as the amount of the present value of the defined benefit obligation, deducting the fair value of any plan assets and adjusting for any effect of the asset ceiling. Service cost and net interest on the net defined benefit liability (asset) are recognized as expenses in the period of service. Remeasurement of the net defined benefit liability (asset), which comprises actuarial gains and losses, the return on plan assets and any change in the effect of the asset ceiling, excluding any amounts included in net interest, is recognized in other comprehensive income in the period in which they occur. Remeasurement recognized in other comprehensive income is reflected immediately in retained earnings and shall not be reclassified to profit or loss in a subsequent period.

(20) Government Grants

In accordance with IAS 20 “Accounting for Government Grants and Disclosure of Government Assistance”, the Company recognizes the government grants when there is reasonable assurance that such grants will be received and the conditions attaching to them will be complied with.

An asset related government grant is recorded as deferred income and recognized in profit or loss on a straight-line basis over the useful lives of the assets. An expense related government grant is recognized in profit or loss on a systematic basis over the periods in which the Company recognizes as expenses the related costs for which the grant is intended to compensate. A government grant that compensates for expenses or losses already incurred or for the purpose of giving immediate financial support to the Company with no future related costs is recognized in profit or loss when it becomes receivable.

(21) Treasury Stock

UMC’s own equity instruments repurchased (treasury stocks) are recognized at repurchase cost and deducted from equity. No gain or loss shall be recognized in profit or loss on the purchase, sale, issue or cancellation of UMC’s own equity instruments. Any difference between the carrying amount and the consideration is recognized in equity.

(22) Share-Based Payment Transactions

Equity-settled share-based payment transactions

The compensation cost of equity-settled transactions between the Company and its employees is measured at the fair value of the equity instruments on the grant date, and is recognized as expense, together with a corresponding increase in equity, over the vesting period. When issuing restricted stocks for employees, the unvested restricted stocks issued on the grant date for employees are recognized in unearned employee compensation as a transitional contra equity account and such account shall be amortized as compensation expense over the vesting period. The cumulative expense recognized for equity-settled transactions at each reporting date until the vesting date reflects the extent to which the vesting period has passed and the Company’s best estimate of the quantity of equity instruments that will ultimately vest. The movement in cumulative cost recognized at the beginning and end of the period is recognized through profit or loss for the period.

No expense is recognized for awards that do not ultimately vest, except for equity-settled transactions where vesting is conditional upon a market or non-vesting condition. The Company shall recognize the services received in expense irrespective of whether or not the market or non-vesting condition is satisfied, provided that all other performance and/or service conditions are satisfied.

Where the terms of an equity-settled transaction award are modified, the minimum expense recognized is the expense as if the terms had not been modified, if the original terms of the award are met. An additional expense is recognized for any modification that increases the total fair value of the share-based payment transaction, or is otherwise beneficial to the employee as measured at the date of modification.

Where an equity-settled award is cancelled, it is treated as if it fully vests on the date of cancellation, and any expense not yet recognized for the award is recognized immediately. This includes any award where non-vesting conditions within the control of either the entity or the employee are not met. However, if a new award substitutes for the cancelled award and is designated as a replacement award on the date that it is granted, the cancelled and new awards are treated as if they were a modification of the original award.

Cash-settled share-based payment transactions

The compensation cost of cash-settled share-based payment transactions between the Company and its employees is measured at the fair value of the liability incurred and recognized as expense with corresponding liability over the vesting period. The fair value of the liability is remeasured at the end of each reporting period and at the settlement date with the movement in fair value recognized through profit or loss for the period until the liability is settled.

(23) Revenue Recognition

Revenue from Contracts with Customers

The Company recognizes revenue from contracts with customers by applying the following steps of IFRS 15 “Revenue from Contracts with Customers”:

a. identify the contract with a customer;

b. identify the performance obligations in the contract;

c. determine the transaction price;

d. allocate the transaction price to the performance obligations in the contract; and

e. recognize revenue when (or as) the entity satisfies its performance obligations.

Revenues on the Company’s contracts with customers for the sales of wafers and joint technology development are recognized as the Company satisfies its performance obligations to customers upon transfer of control of promised goods and services. The Company recognizes revenue at transaction price that are determined using contractual prices reduced by sales returns and allowances which the Company estimates based on historical experience having determined that a significant reversal in the amount of cumulative revenue recognized are not probable to occur. The Company recognizes refund liabilities for estimated sales return and allowances based on the customer complaints, historical experience, and other known factors.

The Company recognizes accounts receivable when the Company transfers control of the goods or services to customers and has a right to an amount of consideration that is unconditional. Such accounts receivable are short term and do not contain a significant financing component. For certain contracts that do not provide the Company unconditional rights to the consideration, and the transfer of control of the goods or services has been satisfied, the Company recognizes contract assets and revenues.

Consideration received from customers prior to the Company having satisfied its performance obligations are accounted for as contract liabilities which are transferred to revenue after the performance obligations are satisfied. The Company recognizes costs to fulfill a contract when the costs relate directly to the contract, generate or enhance resources to be used to satisfy performance obligations in the future, and are expected to be recovered. The costs and revenues are recognized when the Company satisfies its performance obligations to customers upon transfer of control of promised goods and services.

Interest income

For financial assets measured at amortized cost and financial assets at fair value through other comprehensive income, interest income is recorded using the effective interest method and recognized in profit or loss.

Dividends

Revenue is recognized when the Company’s right to receive the dividends is established, which is generally when shareholders approve the dividend.

(24) Income Tax

Income tax expense (benefit) is the aggregate amount of current income tax and deferred income tax included in the determination of profit or loss for the period.

Current income tax

Current income tax assets and liabilities for the current period and prior periods are measured using the tax rates and tax laws that have been enacted or substantively enacted by the end of the reporting period. Current income tax relating to items recognized directly in other comprehensive income or equity is recognized in other comprehensive income or equity rather than profit or loss.

Undistributed earnings, calculated based on Business Entity Accounting Act are subject to a tax in accordance with the Income Tax Law of the R.O.C. Accordingly, the undistributed tax impact is provided in the period the income is earned, assuming that no earnings are distributed. Any reduction in the liability will be recognized when the income is distributed upon the shareholders’ approval in the subsequent year. Tax on undistributed earnings may be offset by the Company’s available tax credits carried forward, where applicable. As such, the incremental tax accrued on undistributed earnings may be offset by a corresponding reduction in deferred income tax assets, where applicable.

Deferred income tax

Deferred income tax is determined using the liability method on temporary differences between the tax bases of assets and liabilities and their carrying amounts in financial statements at the reporting date.

Deferred tax liabilities are recognized for all taxable temporary differences, except:

a. When the deferred tax liability arises from the initial recognition of goodwill or of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss;

b. In respect of taxable temporary differences associated with investments in subsidiaries, associates and joint ventures, when the timing of the reversal of the temporary differences can be controlled and it is probable that the temporary differences will not reverse in the foreseeable future.

Deferred tax assets are recognized for all deductible temporary differences, the carryforward of unused tax losses and unused tax credits, to the extent that it is probable that future taxable profit will be available against which the deductible temporary differences and the carryforward of unused tax losses and unused tax credits can be utilized, except:

a. Where the deferred tax asset relating to the deductible temporary difference arises from the initial recognition of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss;

b. In respect of deductible temporary differences associated with investments in subsidiaries, associates and joint ventures, deferred tax assets are recognized only to the extent that it is probable that the temporary differences will reverse in the foreseeable future and taxable profit will be available against which the temporary differences can be utilized.

Deferred tax assets and liabilities are measured at the tax rates that are expected to apply in the year when the asset is realized or the liability is settled, based on tax rates and tax laws that have been enacted or substantively enacted at the reporting date. The measurement of deferred tax assets and liabilities reflects the tax consequences that would follow the manner in which the Company expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred tax relating to items recognized outside profit or loss is not recognized in profit or loss but rather in other comprehensive income or directly in equity. Deferred tax assets are reassessed and recognized at each reporting date. Unrecognized deferred tax assets are reassessed at each reporting date and are recognized to the extent that it has become probable that future taxable profits will allow the deferred tax assets to be recovered.

Deferred tax assets and liabilities offset each other, if a legally enforceable right exists to set off current income tax assets against current income tax liabilities, and the deferred taxes relate to the same taxable entity and the same taxation authority.

Tax benefits acquired as part of a business combination, but not satisfying the criteria for separate recognition at the acquisition date, might be realized and recognized subsequently as follows:

a. Acquired deferred tax benefits recognized within the measurement period that result from new information about facts and circumstances that existed at the acquisition date shall be applied to reduce the carrying amount of any goodwill related to that acquisition. If the carrying amount of that goodwill is nil, any remaining deferred tax benefits shall be recognized in profit or loss;

b. All other acquired deferred tax benefits realized shall be recognized in profit or loss, other comprehensive income or equity.

The Company has considered whether it is probable that a taxation authority will accept the uncertain tax treatments used in its income tax filings. If the Company concludes that it is probable that the taxation authority will accept an uncertain tax treatment, the Company determines the taxable profit, tax bases, unused tax losses, unused tax credits or tax rates consistently with the tax treatments used or planned to be used in its income tax filings. If it is not probable that the taxation authority will accept an uncertain tax treatment, the Company makes estimates using either the most likely amount or the expected value of the tax treatment, depending on which method the Company expects to better predict the resolution of the uncertainty. The Company reassesses a judgement or estimate if the facts and circumstance change.

(25) Earnings per Share

Earnings per share is computed according to IAS 33 “Earnings per Share”. Basic earnings per share is computed by dividing net income by the weighted-average number of ordinary shares outstanding during the current reporting period. Diluted earnings per share is computed by taking basic earnings per share into consideration plus additional ordinary shares that would have been outstanding if the dilutive share equivalents had been issued. Net income is also adjusted for interest and other income or expenses derived from any underlying dilutive share equivalents. The weighted-average of outstanding shares is adjusted retroactively for stock dividends and employee stock compensation issues.

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Significant Accounting Judgments, Estimates and Assumptions

12 Months Ended

Dec. 31, 2021

Text block1 [abstract]

Significant Accounting Judgments, Estimates and Assumptions

5. SIGNIFICANT ACCOUNTING JUDGMENTS, ESTIMATES AND ASSUMPTIONS

The preparation of the Company’s consolidated financial statements requires management to make judgments, estimates and assumptions that affect the reported amounts of revenues, expenses, assets, liabilities, the accompanying disclosures and the disclosure of contingent liabilities. However, uncertainty about these assumptions and estimates could result in outcomes that require a material adjustment to the carrying amount of assets or liabilities affected in future periods.

The key assumptions concerning the future and other key sources of estimating uncertainty at the reporting date that would have a significant risk for a material adjustment to the carrying amounts of assets or liabilities within the next fiscal year are discussed below.

The Company bases its assumptions and estimates on information available when the consolidated financial statements were prepared. Existing circumstances and assumptions about future developments, however, may change due to market changes or circumstances arising beyond the control of the Company. Such changes are reflected in the assumptions when they occur. Given the global economic climate and unforeseen effects from COVID-19 pandemic, the process of estimation has become more challenging. Actual results could differ from those estimates, and as such, differences may be material to the consolidated financial statements.

(1) The Fair Value of Level 3 Financial Instruments

Where the fair values of the level 3 financial assets recorded on the balance sheet cannot be derived from active markets, they are determined by the application of an appropriate valuation method which was mainly the market approach. The valuation of these financial assets involves significant judgments such as the selection of comparable companies or equity transaction prices and the application of assumptions such as discounts for lack of marketability, valuation multiples, etc. Changes in assumptions about these factors could affect the reported fair value of the financial assets. Please refer to Note 11 for more details.

(2) Inventories

Inventories are valued at the lower of cost and net realizable value item by item. Net realizable value is the estimated selling price in the ordinary course of business less the estimated costs of completion and the estimated costs necessary to make the sale. Please refer to Note 6(5). Costs of completion include direct labor and overhead, including depreciation and maintenance of production equipment, indirect labor costs, indirect material costs, supplies, utilities and royalties that is expected to be incurred at normal production level. The Company estimates normal production level taking into account loss of capacity resulting from planned maintenance, based on historical experience and current production capacity.

(3) Income Tax

Uncertainties exist with respect to the interpretation of complex tax regulations, changes in tax laws, and the amount and timing of future taxable income. The Company establishes provisions, based on reasonable estimates, for possible consequences of audits by the tax authorities of the respective countries in which it operates. The amount of such provisions is based on various factors, such as experience of previous tax audits and different interpretations of tax regulations made by the taxable entity and the responsible tax authority. Such differences of interpretation may arise on a wide variety of issues depending on the conditions prevailing in the respective domicile of the Company.

Deferred tax assets are recognized for all carryforward of unused tax losses, tax credits and deductible temporary differences to the extent that it is probable that future taxable profit will be available or there are sufficient taxable temporary differences against which the unused tax losses, unused tax credits or deductible temporary differences can be utilized. The amount of deferred tax assets determined to be recognized is based upon the likely timing and the level of future taxable profits and taxable temporary differences. Please refer to Note 6(25) for more details on unrecognized deferred tax assets.

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Contents of Significant Accounts

12 Months Ended

Dec. 31, 2021

Contents Of Significant Accounts [Abstract]

Contents of Significant Accounts

6. CONTENTS OF SIGNIFICANT ACCOUNTS

(1) Cash and Cash Equivalents

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Cash on hand and petty cash	$	5,765	$	5,684
Checking and savings accounts		20,163,007		33,738,883
Time deposits		66,939,601		88,876,572
Repurchase agreements collateralized by government bonds and corporate notes		6,939,663		10,000,992
Total	$	94,048,036	$	132,622,131

(2) Financial Assets at Fair Value through Profit or Loss

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets mandatorily measured at fair value through profit or loss
Common stocks	$	9,654,682	$	13,289,438
Preferred stocks		3,299,004		2,602,622
Funds		2,674,476		3,862,932
Convertible bonds		412,175		691,303
Forward contracts		2,384		—
Total	$	16,042,721	$	20,446,295
Current	$	1,216,634	$	945,021
Non-current		14,826,087		19,501,274
Total	$	16,042,721	$	20,446,295

UMC’s subsidiary, FORTUNE VENTURE CAPITAL CORP., exchanged shares with CHIPBOND TECHNOLOGY CORPORATION (CHIPBOND) on November 5, 2021, and obtained 14 million common shares newly issued by CHIPBOND. Please refer to Note 6(18) for further information.

(3) Financial Assets at Fair Value through Other Comprehensive Income

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Equity instruments
Common stocks	$	10,355,999	$	19,683,806
Preferred stocks		170,145		151,859
Total	$	10,526,144	$	19,835,665
Current	$	—	$	8,482,334
Non-current		10,526,144		11,353,331
Total	$	10,526,144	$	19,835,665

The fair value of each investment in equity instrument to be measured at fair value through other comprehensive income is as follows:

 

		As of December 31,
Type of securities	Name of securities	2020		2021
		NT$		NT$
		(In Thousands)		(In Thousands)
Common stock	SILICON INTEGRATED SYSTEMS CORP.		2,039,645		3,407,886
Common stock	UNIMICRON HOLDING LIMITED		722,122		1,461,098
Common stock	ITE TECH. INC.		950,674		1,514,658
Common stock	CHIPBOND TECHNOLOGY CORPORATION		—		3,546,027
Common stock	NOVATEK MICROELECTRONICS CORP.		6,068,053		8,863,632
Common stock	SHIN-ETSU HANDOTAI TAIWAN CO., LTD.		575,505		890,505
Preferred stock	MTIC HOLDINGS PTE. LTD.		170,145		151,859

a. These investments in equity instruments are held for medium to long-term purposes and therefore are accounted for as fair value through other comprehensive income. UMC exchanged shares with CHIPBOND on November 5, 2021, and obtained 53 million common shares newly issued by CHIPBOND for the strategic cooperation between the Company and CHIPBOND. Please refer to Note 6(18) for further information.

b. Dividend income recognized in profit or loss from equity instruments designated as fair value through other comprehensive income are listed below:

	For the years
	ended December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Held at end of period	$	286,795	$	465,679
Derecognized during the period		—		—
Total	$	286,795	$	465,679

c. In consideration of the Company’s investment strategy, the Company disposed and derecognized certain investments designated as fair value through other comprehensive income. Details on derecognition of such investments are listed below:

	For the years
	ended December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Fair value on the date of disposal	$	9,012,450	$	—
Cumulative gains (losses) reclassified to retained earnings due to derecognition	$	1,825,365	$	—

Please refer to UNIMICRON in Note 6(6) for further information of 2020.

d. UMC issued unsecured exchangeable bonds where the bondholders may exchange the bonds at any time on or after October 8, 2021 and prior to June 27, 2026 into Novatek common shares which UMC holds and accounts for as equity instruments investments measured at fair value through other comprehensive income. Please refer to Note 6(13) for the Company’s unsecured exchangeable bonds.

(4) Accounts Receivable, Net

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Accounts receivable	$	27,300,439		$	34,818,600
Less: loss allowance		(206,084	)		(194,491	)
Net	$	27,094,355		$	34,624,109

Aging analysis of accounts receivable:

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Neither past due	$	23,801,905	$	30,758,397
Past due:
≤ 30 days		2,730,865		3,294,617
31 to 60 days		95,398		138,854
61 to 90 days		13,258		8,026
91 to 120 days		23,774		43,413
≥ 121 days		635,239		575,293
Subtotal		3,498,534		4,060,203
Total	$	27,300,439	$	34,818,600

Movement of loss allowance for accounts receivable:

	For the years ended December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Beginning balance	$	621,410		$	206,084
Net reversal for the period		(415,326	)		(11,593	)
Ending balance	$	206,084		$	194,491

The collection periods for third party domestic sales and third party overseas sales were month-end 30-60 days and net 30-60 days, respectively.

An impairment analysis is performed at each reporting date to measure expected credit losses (ECLs) of accounts receivable. For the receivables past due within 60 days, including not past due, the Company estimates an expected credit loss rate to calculate ECLs. For the years ended December 31, 2019, 2020 and 2021, the expected credit loss rates were not greater than 0.2%. The rate is determined based on the Company’s historical credit loss experience and customer’s current financial condition, adjusted for forward-looking factors such as customer’s economic environment. For the receivables past due over 60 days, the Company applies the aforementioned rate and assesses individually whether to recognize additional expected credit losses by considering customer’s operating condition and debt-paying ability.

(5) Inventories, Net

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Raw materials	$	5,507,002	$	3,371,520
Supplies and spare parts		4,290,672		5,106,770
Work in process		11,872,971		14,043,143
Finished goods		881,841		489,750
Total	$	22,552,486	$	23,011,183

a. For the years ended December 31, 2019, 2020 and 2021, the Company recognized NT$122,999 million, NT$133,143 million and NT$135,856 million, respectively, in operating costs, of which NT$820 million in 2019 was related to write-down of inventories, and NT$272 million and NT$426 million in 2020 and 2021, respectively, were related to reversal of write-down of inventories.

b. None of the aforementioned inventories were pledged.

(6) Investments Accounted for Under the Equity Method

a. Details of investments accounted for under the equity method are as follows:

	As of December 31,
	2020				2021
Investee companies	Amount		Percentage of ownership or voting rights		Amount		Percentage of ownership or voting rights
	NT$				NT$
	(In Thousands)				(In Thousands)
Listed companies
FARADAY TECHNOLOGY CORP. (FARADAY) (Note A)	$	1,583,971		13.78	$	1,767,821		13.78
UNIMICRON TECHNOLOGY CORP. (UNIMICRON) (Note B)		9,072,632		13.36		10,337,813		13.30
Unlisted companies
MTIC HOLDINGS PTE. LTD. (Note C)		26,966		45.44		—		45.44
PURIUMFIL INC.		6,206		44.45		7,253		44.45
UNITECH CAPITAL INC.		823,185		42.00		976,559		42.00
TRIKNIGHT CAPITAL CORPORATION		2,481,874		40.00		4,044,867		40.00
HSUN CHIEH CAPITAL CORP.		195,675		40.00		229,598		40.00
HSUN CHIEH INVESTMENT CO., LTD.		2,312,698		36.49		3,437,053		36.49
YANN YUAN INVESTMENT CO., LTD.		3,554,979		30.87		7,013,118		28.22
UNITED LED CORPORATION HONG KONG LIMITED		96,026		25.14		98,954		25.14
VSENSE CO., LTD. (Note C)		941		23.98		—		23.98
TRANSLINK CAPITAL PARTNERS I, L.P. (Note D)		174,985		10.38		225,342		10.38
Total	$	20,330,138			$	28,138,378

Note A: Beginning from June 2015, the Company accounts for its investment in FARADAY as an associate given the fact that the Company obtained the ability to exercise significant influence over FARADAY through representation on its Board of Directors.

Note B: Beginning from June 2020, the Company accounts for its investment in UNIMICRON as an associate given the fact that the Company obtained the ability to exercise significant influence over UNIMICRON through representation on its Board of Directors. UNIMICRON was previously measured at fair value through other comprehensive income and reclassified as investments accounted for under the equity method. Cumulative fair value changes that was previously recognized in other comprehensive income up to reclassification date was reclassified to retained earnings in the current period.

Note C: When the Company’s share of losses of an associate equals or exceeds its interest in that associate, the Company discontinues recognizing its share of further losses. Additional losses and liabilities are recognized only to the extent that the Company has incurred legal or constructive obligations or made payments on behalf of that associate.

Note D: The Company follows international accounting practices in equity accounting for limited partnerships and uses the equity method to account for these investees.

The carrying amount of investments accounted for using the equity method for which there are published price quotations amounted to NT$10,657 million and NT$12,106 million, as of December 31, 2020 and 2021, respectively. The fair value of these investments were NT$18,885 million and NT$53,491 million, as of December 31, 2020 and 2021, respectively.

Although the Company is the largest shareholder of some associates; after comprehensive assessment, the Company does not own the major voting rights as the remaining voting rights holders are able to align and prevent the Company from ruling the relevant operation. Therefore, the Company does not control but owns significant influence over the aforementioned associates.

None of the aforementioned associates were pledged.

b. Financial information of associates :

There is no individually significant associate for the Company. For individually immaterial associates, the following tables summarize the amount recognized by the Company at its share of those associates separately. When an associate is a foreign operation, and the functional currency of the foreign entity is different from the Company, an exchange difference arising from translation of the foreign entity will be recognized in other comprehensive income (loss). Such exchange differences recognized in other comprehensive income (loss) in the financial statements for the years ended December 31, 2019, 2020 and 2021 were NT$(9) million, NT$(53) million and NT$(30) million, respectively, which were not included in the following table.

The aggregate amount of the Company’s share of all its individually immaterial associates that are accounted for using the equity method were as follows:

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Profit from continuing operations	$	115,329	$	1,300,263	$	5,193,495
Other comprehensive income		873,308		973,946		2,965,202
Total comprehensive income	$	988,637	$	2,274,209	$	8,158,697

(7) Other current assets

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Time deposits with original maturities of over three months to a year	$	14,305,779	$	28,834,684
Others		2,945,390		2,988,182
Total	$	17,251,169	$	31,822,866

(8) Property, Plant and Equipment

2020

a. Assets Used by the Company:

Cost:

	Land			Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection			Total
	NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2020	$	1,692,123		$	38,437,588		$	865,547,572		$	65,909		$	6,842,124		$	65,883		$	5,583,516		$	918,234,715
Additions		—			—			—			—			—			—			26,420,747			26,420,747
Disposals		—			(1,316,833	)		(5,305,744	)		(10,856	)		(169,716	)		—			(12,938	)		(6,816,087	)
Transfers and reclassifications		—			109,586			17,142,065			—			246,622			62			(15,528,464	)		1,969,871
Exchange effect		(1,510	)		27,169			(5,814,568	)		(155	)		(10,252	)		(2,171	)		66,435			(5,735,052	)
As of December 31, 2020	$	1,690,613		$	37,257,510		$	871,569,325		$	54,898		$	6,908,778		$	63,774		$	16,529,296		$	934,074,194

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection		Total
	NT$		NT$			NT$			NT$			NT$			NT$			NT$		NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)
As of January 1, 2020	$	—	$	18,950,520		$	745,722,965		$	47,794		$	5,383,434		$	46,147		$	—	$	770,150,860
Depreciation		—		1,688,455			43,089,767			5,334			513,055			7,894			—		45,304,505
Disposals		—		(788,342	)		(5,301,373	)		(10,412	)		(169,680	)		—			—		(6,269,807	)
Transfers and reclassifications		—		—			—			—			1,082			(1,924	)		—		(842	)
Exchange effect		—		655			(5,824,014	)		16			(12,552	)		(2,154	)		—		(5,838,049	)
As of December 31, 2020	$	—	$	19,851,288		$	777,687,345		$	42,732		$	5,715,339		$	49,963		$	—	$	803,346,667
Net carrying amount:
As of December 31, 2020	$	1,690,613	$	17,406,222		$	93,881,980		$	12,166		$	1,193,439		$	13,811		$	16,529,296	$	130,727,527

b. Assets Subject to Operating Leases:

Cost:

	Land			Buildings			Machinery and equipment		Furniture and fixtures		Total
	NT$			NT$			NT$		NT$		NT$
	(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)		(In Thousands)
As of January 1, 2020	$	459,635		$	2,637,271		$	125,413	$	1,315,180	$	4,537,499
Disposals		—			(179,132	)		—		—		(179,132	)
Exchange effect		(13	)		(6,828	)		—		453		(6,388	)
As of December 31, 2020	$	459,622		$	2,451,311		$	125,413	$	1,315,633	$	4,351,979

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment		Furniture and fixtures			Total
	NT$		NT$			NT$		NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)		(In Thousands)			(In Thousands)
As of January 1, 2020	$	—	$	1,019,036		$	125,413	$	1,102,809		$	2,247,258
Depreciation		—		100,454			—		69,425			169,879
Disposals		—		(107,240	)		—		—			(107,240	)
Exchange effect		—		(4,705	)		—		(349	)		(5,054	)
As of December 31, 2020	$	—	$	1,007,545		$	125,413	$	1,171,885		$	2,304,843
Net carrying amount:
As of December 31, 2020	$	459,622	$	1,443,766		$	—	$	143,748		$	2,047,136

2021

a. Assets Used by the Company:

Cost:

	Land			Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection			Total
	NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	1,690,613		$	37,257,510		$	871,569,325		$	54,898		$	6,908,778		$	63,774		$	16,529,296		$	934,074,194
Additions		—			—			—			—			—			—			38,284,083			38,284,083
Disposals		—			(20,455	)		(3,587,695	)		(791	)		(5,010	)		—			(22,822	)		(3,636,773	)
Transfers and reclassifications		(96,439	)		114,081			35,718,256			2,158			433,504			204			(31,692,267	)		4,479,497
Exchange effect		(102,831	)		(523,656	)		(5,893,187	)		(306	)		(32,098	)		(2,696	)		(242,257	)		(6,797,031	)
As of December 31, 2021	$	1,491,343		$	36,827,480		$	897,806,699		$	55,959		$	7,305,174		$	61,282		$	22,856,033		$	966,403,970

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection		Total
	NT$		NT$			NT$			NT$			NT$			NT$			NT$		NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)
As of January 1, 2021	$	—	$	19,851,288		$	777,687,345		$	42,732		$	5,715,339		$	49,963		$	—	$	803,346,667
Depreciation		—		1,474,241			41,329,061			5,310			531,085			7,247			—		43,346,944
Disposals		—		(20,455	)		(3,580,477	)		(791	)		(5,003	)		—			—		(3,606,726	)
Transfers and reclassifications		—		1,645			125,413			—			—			—			—		127,058
Exchange effect		—		(121,750	)		(4,656,461	)		(143	)		(19,038	)		(2,085	)		—		(4,799,477	)
As of December 31, 2021	$	—	$	21,184,969		$	810,904,881		$	47,108		$	6,222,383		$	55,125		$	—	$	838,414,466
Net carrying amount:
As of December 31, 2021	$	1,491,343	$	15,642,511		$	86,901,818		$	8,851		$	1,082,791		$	6,157		$	22,856,033	$	127,989,504

b. Assets Subject to Operating Leases:

Cost:

	Land			Buildings			Machinery and equipment			Furniture and fixtures			Total
	NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	459,622		$	2,451,311		$	125,413		$	1,315,633		$	4,351,979
Transfers and reclassifications		96,439			(18,542	)		(125,413	)		—			(47,516	)
Exchange effect		(7,051	)		(10,380	)		—			(2,930	)		(20,361	)
As of December 31, 2021	$	549,010		$	2,422,389		$	—		$	1,312,703		$	4,284,102

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment			Furniture and fixtures			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	—	$	1,007,545		$	125,413		$	1,171,885		$	2,304,843
Depreciation		—		94,130			—			67,347			161,477
Transfers and reclassifications		—		(1,645	)		(125,413	)		—			(127,058	)
Exchange effect		—		(4,917	)		—			(2,442	)		(7,359	)
As of December 31, 2021	$	—	$	1,095,113		$	—		$	1,236,790		$	2,331,903
Net carrying amount:
As of December 31, 2021	$	549,010	$	1,327,276		$	—		$	75,913		$	1,952,199

In order to improve operations, reduce fixed costs and obtain the funds required for the company future operation, the subsidiary of new business segment (NEXPOWER) disposed of its building and facility equipment located in Taichung City in accordance with a resolution of the Board of Directors’ meeting. The Company completed the disposal in the third quarter of 2020 and recorded a gain on disposal of NT$1,081 million in the other operating income and expenses.

Please refer to Note 8 for property, plant and equipment pledged as collateral.

(9) Leases

The Company leases various properties, such as land (including land use right), buildings, machinery and equipment, transportation equipment and other equipment with lease terms of 1 to 30 years, except for the land use rights with lease term of 50 years. Most lease contracts of land located in R.O.C state that lease payments will be adjusted based on the announced land value. The Company does not have purchase options of leased land at the end of the lease terms.

a. The Company as a lessee

(a) Right-of-use Assets

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Land (including land use right)	$	5,146,342	$	4,877,702
Buildings		352,119		284,011
Machinery and equipment		2,227,035		1,940,084
Transportation equipment		12,252		18,704
Other equipment		10,294		6,344
Net	$	7,748,042	$	7,126,845

	For the years ended December 31,
	2020		2021
	NT$		NT$
Depreciation	(In Thousands)		(In Thousands)
Land (including land use right)	$	333,402	$	325,268
Buildings		120,111		121,373
Machinery and equipment		223,120		210,188
Transportation equipment		8,145		9,858
Other equipment		4,531		4,524
Total	$	689,309	$	671,211

i. For the years ended December 31, 2020 and 2021, the Company’s addition to right-of-use assets amounted to NT$567 million and NT$207 million, respectively.

ii. Please refer to Note 8 for right-of-use assets pledged as collateral.

(b) Lease Liabilities

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Current	$	550,147	$	557,873
Non-current		5,026,717		4,510,881
Total	$	5,576,864	$	5,068,754

Please refer to Note 6(23) for the interest expenses on the lease liabilities.

b. The Company as a lessor

The Company entered into leases on certain property, plant and equipment which are classified as operating leases as they did not transfer substantially all of the risks and rewards incidental to ownership of the underlying assets. The main contracts are to lease the dormitory to the employees with cancellation clauses. Please refer to Note 6(8) for relevant disclosure of property, plant and equipment for operating leases.

(10) Intangible Assets

2020

Cost:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2020	$	15,012	$	3,347,148		$	4,183,505		$	3,548,006		$	11,093,671
Additions		—		1,201,288			212,269			862,063			2,275,620
Write-off		—		(312,411	)		(11,023	)		(915,703	)		(1,239,137	)
Reclassifications		—		(3,808	)		—			—			(3,808	)
Exchange effect		—		32,341			145,714			2,886			180,941
As of December 31, 2020	$	15,012	$	4,264,558		$	4,530,465		$	3,497,252		$	12,307,287

Accumulated Amortization and Impairment:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2020	$	7,398	$	951,176		$	2,299,223		$	2,637,627		$	5,895,424
Amortization		—		1,363,607			536,953			810,225			2,710,785
Write-off		—		(312,411	)		(11,023	)		(915,703	)		(1,239,137	)
Reclassifications		—		841			—			—			841
Exchange effect		—		31,815			26,884			2,762			61,461
As of December 31, 2020	$	7,398	$	2,035,028		$	2,852,037		$	2,534,911		$	7,429,374
Net carrying amount: As of December 31, 2020	$	7,614	$	2,229,530		$	1,678,428		$	962,341		$	4,877,913

2021

Cost:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	15,012	$	4,264,558		$	4,530,465		$	3,497,252		$	12,307,287
Additions		—		1,333,882			56,331			330,976			1,721,189
Write-off		—		(587,102	)		—			(458,295	)		(1,045,397	)
Reclassifications		—		(758	)		—			—			(758	)
Exchange effect		—		(165,543	)		(95,632	)		(21,862	)		(283,037	)
As of December 31, 2021	$	15,012	$	4,845,037		$	4,491,164		$	3,348,071		$	12,699,284

Accumulated Amortization and Impairment:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	7,398	$	2,035,028		$	2,852,037		$	2,534,911		$	7,429,374
Amortization		—		1,566,948			538,874			747,617			2,853,439
Write-off		—		(587,102	)		—			(458,295	)		(1,045,397	)
Exchange effect		—		(101,050	)		(66,244	)		(15,771	)		(183,065	)
As of December 31, 2021	$	7,398	$	2,913,824		$	3,324,667		$	2,808,462		$	9,054,351
Net carrying amount: As of December 31, 2021	$	7,614	$	1,931,213		$	1,166,497		$	539,609		$	3,644,933

The amortization amounts of intangible assets were as follows:

	For the years ended December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Operating costs	$	866,497	$	798,011
Operating expenses	$	1,844,288	$	2,055,428

(11) Short-Term Loans

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Unsecured bank loans	$	11,057,132	$	1,924,124

	For the years ended December 31,
	2019	2020	2021
Interest rates applied	0.00%-4.55%	0.00%-4.05%	0.15%-3.60%

The Company’s unused short-term lines of credit amounted to NT$63,177 million and NT$72,743 million as of December 31, 2020 and 2021, respectively.

(12) Financial Liabilities at Fair Value through Profit or Loss, Current

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Embedded derivatives in exchangeable bonds	$	—	$	2,380,599
Forward contracts		2,326		—
Total	$	2,326	$	2,380,599

(13) Bonds Payable

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured domestic bonds payable	$	18,700,000		$	31,300,000
Unsecured exchangeable bonds payable		—			10,817,047
Less: Discounts on bonds payable		(9,616	)		(1,580,389	)
Total		18,690,384			40,536,658
Less: Current or exchangeable portion due within one year		(1,999,910	)		(17,458,959	)
Net	$	16,690,474		$	23,077,699

a. UMC issued domestic unsecured corporate bonds. The terms and conditions of the bonds are as follows:

Term	Issuance date	Issued amount	Coupon rate		Repayment
Seven-year	In mid-March 2013	NT$2,500 million		1.50%	Interest was paid annually and the principal was fully repaid in March 2020.
Seven-year	In mid-June 2014	NT$2,000 million		1.70%	Interest was paid annually and the principal was fully repaid in June 2021.
Ten-year	In mid-June 2014	NT$3,000 million		1.95%	Interest will be paid annually and the principal will be repayable in June 2024 upon maturity.
Five-year	In late March 2017	NT$6,200 million		1.15%	Interest will be paid annually and the principal will be repayable in March 2022 upon maturity.
Seven-year	In late March 2017	NT$2,100 million		1.43%	Interest will be paid annually and the principal will be repayable in March 2024 upon maturity.
Five-year	In early October 2017	NT$2,000 million		0.94%	Interest will be paid annually and the principal will be repayable in October 2022 upon maturity.

Term	Issuance date	Issued amount	Coupon rate		Repayment
Seven-year	In early October 2017	NT$3,400 million		1.13%	Interest will be paid annually and the principal will be repayable in October 2024 upon maturity.
Five-year	In late April 2021	NT$5,500 million		0.57%	Interest will be paid annually and the principal will be repayable in April 2026 upon maturity.
Seven-year	In late April 2021	NT$2,000 million		0.63%	Interest will be paid annually and the principal will be repayable in April 2028 upon maturity.
Ten-year (green bond)	In late April 2021	NT$2,100 million		0.68%	Interest will be paid annually and the principal will be repayable in April 2031 upon maturity.
Five-year	In mid-December 2021	NT$5,000 million		0.63%	Interest will be paid annually and the principal will be repayable in December 2026 upon maturity.

b. On May 18, 2015, UMC issued SGX-ST listed currency linked zero coupon convertible bonds. In accordance with IAS 32 “Financial Instruments Presentation”, the value of the conversion right of the convertible bonds was determined at issuance and recognized in additional paid-in capital-stock options amounting to NT$1,894 million, after reduction of issuance costs amounting to NT$9 million. The effective interest rate on the liability component of the convertible bonds was determined to be 2.03%. The terms and conditions of the bonds are as follows:

i. Issue Amount: US$600 million

ii. Period: May 18, 2015 - May 18, 2020 (Maturity date)

iii. Redemption:

(i) UMC may redeem the bonds, in whole or in part, after 3 years of the issuance and prior to the maturity date, at the principal amount of the bonds with an interest calculated at the rate of -0.25% per annum (the Early Redemption Amount) if the closing price of the ordinary shares of UMC on the TWSE, for a period of 20 out of 30 consecutive trading days, the last of which occurs not more than 5 days prior to the date upon which notice of such redemption is published, is at least 125% of the conversion price. The Early Redemption Price will be converted into NTD based on the Fixed Exchange Rate (NTD 30.708=USD 1.00), and this fixed NTD amount will be converted using the prevailing rate at the time of redemption for payment in USD.

(ii) UMC may redeem the bonds, in whole, but not in part, at the Early Redemption Amount if at least 90% in principal amount of the bonds has already been converted, redeemed or repurchased and cancelled.

(iii) UMC may redeem all, but not part, of the bonds, at the Early Redemption Amount at any time, in the event of certain changes in the R.O.C.’s tax rules which would require UMC to gross up for payments of principal, or to gross up for payments of interest or premium.

(iv) All or any portion of the bonds will be redeemable at Early Redemption Amount at the option of bondholders on May 18, 2018 at 99.25% of the principal amount.

(v) Bondholders have the right to require UMC to redeem all of the bonds at the Early Redemption Amount if UMC’s ordinary shares cease to be listed on the Taiwan Stock Exchange.

(vi) In the event that a change of control as defined in the indenture of the bonds occurs to UMC, the bondholders shall have the right to require UMC to redeem the bonds, in whole but not in part, at the Early Redemption Amount.

iv. Terms of Conversion:

(i) Underlying Securities: Ordinary shares of UMC

(ii) Conversion Period: The bonds are convertible at any time on or after June 28, 2015 and prior to May 8, 2020, into UMC ordinary shares; provided, however, that if the exercise date falls within 5 business days from the beginning of, and during, any closed period, the right of the converting holder of the bonds to vote with respect to the shares it receives will be subject to certain restrictions.

(iii) Conversion Price and Adjustment: The conversion price was originally NT$17.50 per share. The conversion price will be subject to adjustments upon the occurrence of certain events set out in the indenture.

v. Conversion of Bonds:

The last conversion date of the bonds was on March 31, 2020. For the years ended December 31, 2019 and 2020, the outstanding principal amount of the convertible bonds totaling US$15 million and US$215 million had been converted into 33 million shares and 465 million shares, respectively.

Upon the maturity date of May 18, 2020, UMC fully redeemed the remaining unconverted bonds at 98.76% of the principal amount. The principal amount of redemption amounted to US$369 million. UMC reclassified cancelled convertible rights of NT$1,166 million from additional paid in capital-stock options to additional paid in capital-others.

c. On July 7, 2021, UMC issued SGX-ST listed currency linked zero coupon exchangeable bonds. In accordance with IFRS 9, the value of the exchange right, call option and put option (together referred to as Option) of the exchangeable bonds was separated from the host and accounted for as “financial liabilities at fair value through profit or loss, current”. The effective rate of the host bond was 3.49%. The terms and conditions of the bonds are as follows:

i. Issue Amount: US$400 million

ii. Period: July 7, 2021 - July 7, 2026 (Maturity Date)

iii. Redemption:

UMC may, at its option, redeem in whole or in part at the principal amount of the bonds with an interest calculated at the rate of -0.625% per annum (the Early Redemption Amount) at any time after the third anniversary from the issue date and prior to the Maturity Date, if the closing price of the common shares of Novatek Microelectronics Corporation (“Novatek”) on the Taiwan Stock Exchange (the “TWSE”), converted into U.S. dollars at the prevailing exchange rate, for 20 out of 30 consecutive trading days prior to the publication of the redemption notice is at least 130% of the quotient of the Early Redemption Amount multiplied by the then exchange price (converted into U.S. dollars at the Fixed Exchange Rate), divided by the principal amount of the bonds.

(i) The Early Redemption Amount will be converted into NTD based on the Fixed Exchange Rate (NTD 27.902=USD 1.00), and this fixed NTD amount will then be converted using the prevailing exchange at the time of redemption for payment in USD.

(ii) UMC may redeem the outstanding bonds in whole, but not in part, at the Early Redemption Amount, in the event that over 90% of the bonds have been previously redeemed, repurchased and cancelled or exchanged.

(iii) In the event of any change in ROC taxation resulting in increase of tax obligation or the necessity to pay additional interest expense or increase of additional costs to UMC, UMC may redeem the outstanding bonds in whole, but not in part, at the Early Redemption Amount. Bondholders may elect not to have their bonds redeemed but with no entitlement to any additional amounts or reimbursement of additional taxes.

(iv) All or any portion of the bonds will be redeemable at put price at the option of bondholders on July 7, 2024 at 98.14% of the principal amount.

(v) In the event that the common shares of Novatek cease to be listed or are suspended from trading for a period equal to or exceeding 30 consecutive trading days on the TWSE, each bondholder shall have the right to require UMC to redeem the bonds, in whole but not in part, at the Early Redemption Amount.

(vi) Upon the occurrence of a change of control (as defined in the indenture) of UMC, each bondholder shall have the right to require UMC to redeem the bonds, in whole but not in part, at the Early Redemption Amount.

iv. Terms of Exchange:

(i) Underlying Securities: Common Shares of Novatek

(ii) Exchange Period: The bonds are exchangeable at any time on or after October 8, 2021 and prior to June 27, 2026, into Novatek common shares. If for any reason UMC does not have sufficient Novatek common shares to deliver upon the exchange of any bond, then, UMC will pay to the exchanging bondholder an amount in U.S. dollars equal to the product of the volume-weighted average closing price per Novatek common share on the TWSE for five consecutive trading days starting from and including the applicable exercise date (as defined in the indenture) (or such fewer number of trading days as are available within ten days starting from and including the applicable exercise date) each converted into USD at the prevailing rate on the day preceding the applicable trading day and the number of Novatck common shares that UMC is unable to deliver. Provided, however, that if the exercise date falls within 5 business days from the beginning of, and during, any closed period, the right of the converting holder of the bonds to vote with respect to the shares it receives will be subject to certain restrictions.

(iii) Exchange Price and Adjustment: The exchange price was originally NT$731.25 per Novatek common share. The exchange price will be subject to adjustments upon the occurrence of certain events set out in the indenture. The exchange price was NT$709.2 per Novatek common share on December 31, 2021.

v. Redemption on the Maturity Date:

The bonds will be redeemed with 96.92% principal amount on the maturity date unless:

(i) UMC shall have redeemed the bonds at the option of UMC, or the bonds shall have been redeemed at option of the bondholder;

(ii) The bondholders shall have exercised the exchange right before maturity; or

(iii) The bonds shall have been redeemed or repurchased by UMC and cancelled.

(14) Long-Term Loans

a. Details of long-term loans as of December 31, 2020 and 2021 were as follows:

	As of December 31,
Lenders	2020		2021		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Long-Term Loan from Mega International Commercial Bank (1)	$	1,640	$	—	Repayable quarterly from July 3, 2017 to July 5, 2021 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Mega International Commercial Bank (2)		19,464		14,598	Repayable quarterly from October 24, 2019 to October 24, 2024 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (1)		59,459		47,568	Repayable quarterly from October 19, 2015 to October 19, 2025 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (2)		21,146		13,125	Repayable monthly from May 31, 2019 to May 31, 2023 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (3)		56,000		44,000	Repayable monthly from August 13, 2020 to August 13, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (4)		28,965		22,759	Repayable monthly from October 29, 2020 to August 29, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (5)		—		101,000	Repayable monthly from April 15, 2021 to April 15, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Syndicated Loans from China Development Bank and 6 others (1) (Note A)		22,236,343		18,158,940	Repayable semi-annually from October 20, 2016 to October 20, 2024 with semi-annually interest payments. Interest-only payment for the first and the second year.

	As of December 31,
Lenders	2020		2021		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Syndicated Loans from China Development Bank and 6 others (2)		—		12,236,000	Repayable semi-annually from March 19, 2021 to March 18, 2031 with semi-annually interest payments. Interest-only payment for the first and the second year.
Secured Long-Term Loan from First Commercial Bank		—		47,000	Repayable monthly from December 2, 2021 to December 2, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from KGI Bank		—		21,000	Repayable semi-annually from December 27, 2021 to December 27, 2026 with monthly interest payments. Interest-only payment for the first and the second year.
Unsecured Long-Term Loan from ICBC Bank		1,702,589		—	Repayable semi-annually from September 20, 2019 to September 9, 2021 with quarterly interest payments. Interest-only payment for the first semi-annually year.
Unsecured Long-Term Loan from Xiamen Bank		440,500		436,126	Repayable semi-annually from November 24, 2020 to May 24, 2022 of RMB 0.1 million with monthly interest payments and the remaining principal will be repaid once at maturity. Interest-only payment for the first semi-annually year.
Unsecured Long-Term Loan from Bank of China		—		982,791	Repayable semi-annually from June 24, 2023 to June 24, 2026 with quarterly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan (1)		2,000,000		500,000	Repayable quarterly from March 10, 2022 to December 10, 2024 with monthly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan (2)		—		450,000	Repayable quarterly from March 24, 2023 to March 24, 2025 with monthly interest payments.
Unsecured Long-Term Loan from Taiwan Cooperative Bank		2,000,000		—	Repayable quarterly from May 5, 2023 to May 5, 2025 with monthly interest payments.
Unsecured Revolving Loan from Mega International Commercial Bank (Note B)		1,500,000		500,000	Repayable semi-annually from October 16, 2020 to April 16, 2022 with monthly interest payments.
Unsecured Revolving Loan from Taipei Fubon Bank (Note C)		700,000		200,000	Repayable annually from August 9, 2020 to August 9, 2023 with monthly interest payments.
Unsecured Revolving Loan from Chang Hwa Commercial Bank (Note D)		1,000,000		550,000	Repayable quarterly from January 27, 2021 to October 27, 2022 with monthly interest payments.
Unsecured Revolving Loan from KGI Bank (1) (Note E)		1,000,000		—	Repayable annually from December 11, 2021 to December 11, 2023 with monthly interest payments.
Unsecured Revolving Loan from KGI Bank (2) (Note E )		—		500,000	Repayable annually from August 10, 2023 to August 10, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (1) (Note F)		300,000		—	Settlement due on May 15, 2025 with monthly interest payments.

	As of December 31,
Lenders	2020			2021			Redemption
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured Revolving Loan from First Commercial Bank (2) (Note G)		—			300,000		Settlement due on February 25, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (3) (Note G)		—			300,000		Settlement due on March 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (4) (Note G)		—			200,000		Settlement due on June 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from Yuanta Commercial Bank (Note H)		—			1,000,000		Repayable annually from March 2, 2023 to March 2, 2026 with monthly interest payments.
Subtotal		33,066,106			36,624,907
Less: Current portion		(24,985,168	)		(19,873,011	)
Total	$	8,080,938		$	16,751,896

	For the years ended December 31,
	2019		2020		2021
Interest rates applied		0.55%-5.56%		0.84%-4.67%		0.85%-4.66%

Note A: USCXM, the subsidiary of UMC failed to comply with the loan covenant to maintain its financial ratio at certain level and therefore the loan is reclassified to current liabilities as of December 31, 2020 and 2021. The bank exemption of 2020 and 2021 have been obtained as of April 21, 2021 and February 7, 2022, respectively.

Note B: UMC entered into a 5-year loan agreement with Mega International Commercial Bank, effective from October 17, 2016. The agreement offered UMC a revolving line of credit of NT$3 billion. This line of credit will be reduced starting from the end of the two years and six months after the first use and every six months thereafter, with a total of six adjustments. The expiration date of the agreement is April 16, 2022. As of December 31, 2020 and 2021, the line of credit were fully utilized.

Note C: UMC entered into a 5-year loan agreement with Taipei Fubon Bank, effective from February 9, 2018. The agreement offered UMC a revolving line of credit of NT$2 billion. This line of credit will be reduced starting from the end of the two years after the first use and every twelve months thereafter, with a total of four adjustments. The expiration date of the agreement is August 9, 2023. As of December 31, 2020 and 2021, the unused line of credit were both NT$0.8 billion.

Note D: UMC entered into a 5-year loan agreement with Chang Hwa Commercial Bank, effective from November 2, 2016. The agreement offered UMC a revolving line of credit of NT$3 billion. This line of credit will be reduced starting from the end of the third year after the first use and every three months thereafter, with a total of nine adjustments. The expiration date of the agreement is October 27, 2022. As of December 31, 2020 and 2021, the unused line of credit were NT$1.7 billion and NT$0.8 billion, respectively.

Note E: UMC entered into a 5-year loan agreement with KGI Commercial Bank, effective from September 11, 2018. The agreement offered UMC a revolving line of credit of NT$2.5 billion which has been modified into NT$3 billion as of May 10, 2021. This line of credit will be reduced starting from the end of the second year after the first use and every twelve months thereafter, with a total of four adjustments. The expiration date of the agreement is August 10, 2026. As of December 31, 2020 and 2021, the unused line of credit were NT$1 billion and NT$2.5 billion, respectively.

Note F: First Commercial Bank approved the 1-year credit loan on December 30, 2019, which has expired on December 30, 2020.

Note G: First Commercial Bank approved the 1-year credit loan on January 18, 2021, which offered UMC a revolving line of credit of NT$2 billion starting from the approval date to January 17, 2022. As of December 31, 2021, the unused line of credit was NT$1.2 billion.

Note H: UMC entered into a 5-year loan agreement with Yuanta Commercial Bank, effective from March 3, 2021. The agreement offered UMC a revolving line of credit of NT$4 billion. This line of credit will be reduced starting from the end of the second year after the contract date and every twelve months thereafter, with a total of four adjustments. The expiration date of the agreement is March 2, 2026. As of December 31, 2021, the unused line of credit was NT$3 billion.

b. Please refer to Note 8 for property, plant and equipment and right-of-use assets pledged as collateral for long- term loans.

c. In 2016, HJ resolved to provide endorsement for USCXM’s syndicated loan from banks including China Development Bank. The maximum balance for the years ended December 31, 2020 and 2021 were NT$8,362 million and NT$7,450 million, respectively. As of December 31, 2020 and 2021, the actual amount provided were NT$4,564 million and NT$6,438 million, respectively.

d. In 2017, UMC resolved to provide endorsement for USCXM’s syndicated loan from banks including China Development Bank. The maximum balance for the years ended December 31, 2020 and 2021 were US$371 million/RMB¥1.97 billion and US$290 million/RMB¥2.05 billion, respectively. As of December 31, 2020 and 2021, the actual amount provided were NT$10,350 million and NT$14,566 million, respectively.

(15) Post-Employment Benefits

a. Defined contribution plan

The employee pension plan under the Labor Pension Act of the R.O.C. is a defined contribution plan. Pursuant to the plan, UMC and its domestic subsidiaries make monthly contributions of 6% based on each individual employee’s salary or wage to employees’ pension accounts. Pension benefits for employees of the Singapore branch and subsidiaries overseas are provided in accordance with the local regulations. Total pension expenses of NT$1,369 million, NT$1,478 million and NT$1,636 million were contributed by the Company for the years ended December 31, 2019, 2020 and 2021, respectively.

b. Defined benefit plan

The employee pension plan mandated by the Labor Standards Act of the R.O.C. is a defined benefit plan. The pension benefits are disbursed based on the units of service years and average monthly salary prior to retirement according to the Labor Standards Act. Two units per year are awarded for the first 15 years of services while one unit per year is awarded after the completion of the 15th year and the total units will not exceed 45 units. The Company contributes an amount equivalent to 2% of the employees’ total salaries and wages on a monthly basis to the pension fund deposited with the Bank of Taiwan under the name of a pension fund supervisory committee. The pension fund is managed by the government’s designated authorities and therefore is not included in the Company’s consolidated financial statements. For the years ended December 31, 2019, 2020 and 2021, total pension expenses of NT$59 million, NT$40 million and NT$23 million, respectively, were recognized by the Company.

i. Movements in present value of defined benefit obligation during the year:

	For the years ended December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Defined benefit obligation at beginning of year	$	(5,411,069	)	$	(5,561,999	)
Items recognized as profit or loss:
Service cost		(13,090	)		(11,009	)
Interest cost		(36,254	)		(16,130	)
Subtotal		(49,344	)		(27,139	)
Remeasurements recognized in other comprehensive income (loss):
Arising from changes in demographic assumptions		—			(4,537	)
Arising from changes in financial assumptions		(173,615	)		(123,140	)
Experience adjustments		(70,461	)		(91,268	)
Subtotal		(244,076	)		(218,945	)
Benefits paid		142,490			349,750
Defined benefit obligation at end of year	$	(5,561,999	)	$	(5,458,333	)

ii. Movements in fair value of plan assets during the year:

	For the years ended December 31,
	2020			2021
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance of fair value of plan assets	$	1,385,696		$	1,399,345
Items recognized as profit or loss:
Interest income on plan assets		9,284			4,059
Contribution by employer		95,360			505,890
Benefits paid		(142,490	)		(349,750	)
Remeasurements recognized in other comprehensive income (loss):
Return on plan assets, excluding amounts included in interest income		51,495			21,468
Fair value of plan assets at end of year	$	1,399,345		$	1,581,012

The actual returns on plan assets of the Company for the years ended December 31, 2020 and 2021 were NT$61 million and NT$26 million, respectively.

iii. The defined benefit plan recognized on the consolidated balance sheets were as follows:

	As of December 31,
	2020			2021
	NT$ (In Thousands)			NT$ (In Thousands)
Present value of the defined benefit obligation	$	(5,561,999	)	$	(5,458,333	)
Fair value of plan assets		1,399,345			1,581,012
Funded status		(4,162,654	)		(3,877,321	)
Net defined benefit liabilities, noncurrent recognized on the consolidated balance sheets	$	(4,162,654	)	$	(3,877,321	)

iv. The major categories of plan assets as a percentage of the fair value of the total plan assets are as follows:

	As of December 31,
	2020			2021
Cash		16	%		24	%
Equity instruments		48	%		43	%
Debt instruments		25	%		23	%
Others		11	%		10	%

Employee pension fund is deposited under a trust administered by the Bank of Taiwan. The overall expected rate of return on assets is determined based on historical trend and actuaries’ expectations on the assets’ returns in the market over the obligation period. Furthermore, the utilization of the fund is determined by the labor pension fund supervisory committee, which also guarantees the minimum earnings to be no less than the earnings attainable from interest rates offered by local banks for two-year time deposits.

v. The principal underlying actuarial assumptions are as follows:

	As of December 31,
	2020			2021
Discount rate		0.29	%		0.62	%
Rate of future salary increase		3.50	%		4.25	%

vi. Expected future benefit payments are as follows:

Year	As of December 31, 2021
	NT$ (In Thousands)
2022	$	373,879
2023		373,406
2024		397,426
2025		432,167
2026		435,179
2027 and thereafter		3,721,746
Total	$	5,733,803

The Company expects to make pension fund contribution of NT$697 million in 2022. The weighted-average durations of the defined benefit obligation were 9 years and 8 years as of December 31, 2020 and 2021, respectively.

vii. Sensitivity analysis:

	As of December 31, 2020
	Discount rate				Rate of future salary increase
	0.5% increase		0.5% decrease		0.5% increase			0.5% decrease
	NT$ (In Thousands)		NT$ (In Thousands)		NT$ (In Thousands)			NT$ (In Thousands)
Decrease (increase) in defined benefit obligation	$	226,798	$	—	$	(204,390	)	$	195,078

	As of December 31, 2021
	Discount rate					Rate of future salary increase
	0.5% increase		0.5% decrease			0.5% increase			0.5% decrease
	NT$ (In Thousands)		NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)
Decrease (increase) in defined benefit obligation	$	207,999	$	(220,561	)	$	(184,551	)	$	176,567

The sensitivity analyses above have been determined based on a method that extrapolates the impact on the net defined benefit obligation as a result of reasonable changes in key assumptions occurring at the end of the reporting period.

(16) Deferred Government Grants

	As of December 31,
	2020			2021
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance	$	13,551,553		$	10,207,109
Arising during the period		578,844			2,498,990
Recorded in profit or loss:
Other operating income		(3,994,818	)		(4,069,055	)
Exchange effect		71,530			(93,246	)
Ending balance	$	10,207,109		$	8,543,798
Current (classified under other current liabilities)	$	3,836,211		$	4,096,742
Non-current (classified under other noncurrent liabilities)		6,370,898			4,447,056
Total	$	10,207,109		$	8,543,798

The significant government grants related to equipment acquisitions received by the Company are amortized as income over the useful lives of related equipment and recorded in the net other operating income and expenses.

(17) Refund Liabilities (classified under other current liabilities)

	As of December 31,
	2020		2021
	NT$ (In Thousands)		NT$ (In Thousands)
Refund liabilities	$	1,252,451	$	724,207

(18) Equity

a. Capital stock:

i. UMC had 26,000 million common shares authorized to be issued as of December 31, 2020 and 2021, of which 12,422 million shares and 12,483 million shares were issued as of December 31, 2020 and 2021, respectively, each at a par value of NT$10.

ii. UMC had 127 million and 149 million ADSs, which were traded on the NYSE as of December 31, 2020 and 2021, respectively. The total number of common shares of UMC represented by all issued ADSs were 636 million shares and 746 million shares as of December 31, 2020 and 2021, respectively. One ADS represents five common shares.

iii. Please refer to Note 6(13) for the Company’s conversion of unsecured convertible bonds into ordinary shares of UMC for the year ended December 31, 2020.

iv. On September 1, 2020 and June 9, 2021, UMC issued restricted stocks for its employees in a total of 200 million shares and 1 million shares with a par value of NT$10 each, respectively. The aforementioned issuance of new shares was approved by the competent authority and the registration was completed. Please refer to Note 6(19) for the information of restricted stocks.

v. As of December 31, 2021, UMC has recalled and cancelled 2 million shares of restricted stocks issued for employees according to the issuance plan. The aforementioned reduction of capital was approved by the competent authority and the registration was completed.

vi. On September 3, 2021, the Board of Directors’ meeting approved the share exchange transaction with CHIPBOND. UMC issued 61 million common shares with a par value of NT$10 and obtained 53 million common shares newly issued by CHIPBOND. The aforementioned issuance of new shares was approved by the competent authority and the change in share registration was completed. The share exchanged date was November 5, 2021. Please refer to Note 6(3) for further information.

b. Treasury stock:

i. UMC carried out a treasury stock program and repurchased its shares from the centralized securities exchange market. The purpose for the repurchase and changes in treasury stock during the years ended December 31, 2020 and 2021 were as follows:

For the year ended December 31, 2020

(In thousands of shares)

Purpose	As of January 1, 2020		Increase		Decrease		As of December 31, 2020
For transfer to employees		—		105,000		105,000		—

For the year ended December 31, 2021: None.

ii. According to the Securities and Exchange Law of the R.O.C., the total shares of treasury stock shall not exceed 10% of UMC’s issued stock, and the total purchase amount shall not exceed the sum of the retained earnings, additional paid-in capital-premiums and realized additional paid-in capital. As of December 31, 2020 and 2021, the treasury stock held by UMC did not exceed the threshold.

iii. In compliance with Securities and Exchange Law of the R.O.C., treasury stock held by the parent company should not be pledged, nor should it be entitled to voting rights or receiving dividends. Stock held by subsidiaries and associates is treated as treasury stock. According to the Company Act of R.O.C., these subsidiaries have the same rights as other shareholders except for subscription to new stock issuance and voting rights.

iv. As of December 31, 2020, UMC’s subsidiary, FORTUNE VENTURE CAPITAL CORP. (FORTUNE), held 16 million shares of UMC’s stock and FORTUNE measured UMC’s stock as financial assets at fair value through other comprehensive income. On September 3, 2021, the share exchange transaction with CHIPBOND was approved by FORTUNE’s Board of Directors’ meeting. The 16 million shares of UMC held by FORTUNE were exchanged for 14 million common shares newly issued by CHIPBOND. As of December 31, 2020 and 2021, UMC’s associate, HSUN CHIEH INVESTMENT CO., LTD. (HSUN CHIEH), held 441 million shares of UMC’s stock and UMC’s associate, YANN YUAN INVESTMENT CO., LTD. (YANN YUAN), held 201 million and 160 million shares of UMC’s stock, respectively. HSUN CHIEH measured UMC’s stock as financial assets at fair value through profit or loss while YANN YUAN measured UMC’s stock as financial assets at fair value through other comprehensive income. The closing prices of UMC’s stock on December 31, 2020 and 2021 were NT$47.15 and NT$65.00, respectively.

c. Retained earnings and dividend policies:

According to UMC’s Articles of Incorporation, current year’s earnings, if any, shall be distributed in the following order :

i. Payment of taxes.

ii. Making up loss for preceding years.

iii. Setting aside 10% for legal reserve, except for when accumulated legal reserve has reached UMC’s paid-in capital.

iv. Appropriating or reversing special reserve by government officials or other regulations.

v. The remaining, if applicable, may be distributed preferentially as preferred shares dividends for the current year, and if there is still a remaining balance, in addition to the previous year’s unappropriated earnings, UMC shall distribute it according to the distribution plan proposed by the Board of Directors according to the dividend policy and submitted to the shareholders’ meeting for approval.

Because UMC conducts business in a capital intensive industry and continues to operate in its growth phase, the dividend policy of UMC shall be determined pursuant to factors such as the investment environment, its funding requirements, domestic and overseas competitive landscape and its capital expenditure forecast, as well as shareholders’ interest, balancing dividends and UMC’s long-term financial planning. The Board of Directors shall propose the distribution plan and submit it to the shareholders’ meeting every year. The distribution of shareholders’ dividend shall be allocated as cash dividend in the range of 20% to 100%, and stock dividend in the range of 0% to 80%.

According to the regulations of Taiwan Financial Supervisory Commission (FSC), UMC is required to appropriate a special reserve in the amount equal to the sum of debit elements under equity, such as unrealized loss on financial instruments and debit balance of exchange differences on translation of foreign operations, at every year-end. Such special reserve is prohibited from distribution. However, if any of the debit elements is reversed, the special reserve in the amount equal to the reversal may be released for earnings distribution or offsetting accumulated deficits.

The appropriation of earnings for 2020 was approved by the shareholders’ meeting held on July 7, 2021, while the appropriation of earnings for 2021 was proposed by the Board of Directors’ meeting on February 24, 2022. The details of appropriation were as follows:

	Appropriation of earnings (in thousand NT dollars)						Cash dividend per share (NT dollars)
	2020			2021			2020		2021
Legal reserve	$	3,197,890		$	5,832,570
Special reserve		(2,857,666	)		(3,250,434	)
Cash dividends		19,875,842			—		$	1.60	$	—

In addition, the Board of Directors’ meeting held on February 24, 2022 proposed to distribute cash from additional paid-in capital of NT$37,446 million, at approximately NT$3.00 per share.

The aforementioned 2020 appropriation approved by shareholders’ meeting was consistent with the resolutions of the Board of Directors’ meeting held on February 24, 2021.

The cash dividend per share for 2020 was adjusted to NT$1.59988820 per share. The adjustment was due to the net increase of outstanding common shares from cancellation and issuance of the restricted stocks.

The appropriation of 2021 unappropriated retained earnings has not yet been approved by the shareholders’ meeting as of the reporting date. Information relevant to the Board of Directors’ meeting resolutions and shareholders’ meeting approval can be obtained from the “Market Observation Post System” on the website of the TWSE.

Please refer to Note 6(21) for information on the employees and directors’ compensation.

d. Non-controlling interests:

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Beginning balance	$	466,768		$	410,065		$	113,356
Attributable to non-controlling interests:
Net loss		(3,578,847	)		(2,009,077	)		(668,245	)
Other comprehensive income (loss)		(15,213	)		126,653			(19	)
Disposal of subsidiaries		—			(51,565	)		—
The differences between the fair value of the consideration paid or received from acquiring or disposing subsidiaries and the carrying amounts of the subsidiaries		—			106,879			—
Changes in subsidiaries’ ownership		24,740			(10,331	)		(11,126	)
Non-controlling interests		—			(551,608	)		23,430
Derecognition of the non-controlling interests		3,512,617			2,092,340			765,785
Ending balance	$	410,065		$	113,356		$	223,181

(19) Share-Based Payment

a. Treasury stock plan for employees

In August 2018, the Company executed a compensation plan to offer 200 million shares of treasury stock to qualified employees of UMC. The compensation cost for the share-based payment was measured at fair value, having recognized in expense the difference between the closing quoted market price of the shares at the grant date and the cash received from employees. The closing quoted market price of the Company’s shares on the grant date was NT$16.95 per share. For the stocks vested on the date of grant, the Company recognized the entire compensation cost once granted, whereas for the stocks with requisite service conditions to vest at the end of one or two years from the date of grant, the Company recognizes the compensation cost over the vesting period in which the services conditions are fulfilled, together with a corresponding increase in equity. The compensation plan had expired in September 2020. For the years ended December 31, 2019 and 2020, the compensation cost of NT$366 million and NT$107 million, respectively, were recognized in expenses by the Company.

In September 2020, the Company executed a compensation plan to offer 105 million shares of treasury stock to qualified employees of the Company. The compensation cost for the share-based payment was measured at fair value, having recognized in expense the difference between the closing quoted market price of the shares at the grant date and the cash received from employees. The closing quoted market price of the Company’s shares on the grant date was NT$21.45 per share. For the stocks vested on the date of grant, the Company recognized the entire compensation cost once granted, whereas for the stocks with requisite service conditions to vest at the end of one year from the date of grant, the Company recognizes the compensation cost over the period in which the services conditions are fulfilled, together with a corresponding increase in equity. The compensation plan had expired in September 2021. For the years ended December 31, 2020 and 2021, the compensation costs of NT$348 million and NT$226 million, respectively, were recognized in expenses by the Company.

b. Restricted stock plan for employees

On June 10, 2020, the shareholders approved a compensation plan in their meeting to issue restricted stocks to qualified employees of UMC without consideration. The maximum shares to be issued are 233 million common shares. The Company is authorized to issue restricted stocks in one tranche or in installments, under the custody of trust institution, within one year from the date of receiving the effective registration from the competent authority.

The issuance plan was authorized for effective registration by the Securities and Futures Bureau of the FSC and accordingly, 200 million shares and 1 million shares of restricted stock for employees were issued without consideration on September 1, 2020 and June 9, 2021, respectively. The life of the plan is four years. Beginning from the end of two years since the date of grant, those employees who fulfill both service period and performance conditions set by the Company are gradually eligible to the vested restricted stocks at certain percentage and time frame. For those employees who fail to fulfill the vesting conditions, the Company will recall and cancel their stocks without consideration. During the vesting period, the restricted stock holders are entitled the same rights as those of common stock holders including the right to receive dividends, but are restricted to sell, pledge, set guarantee, transfer, grant, or dispose the restricted stocks in any other ways. Related information can be obtained from the “Market Observation Post System” on the website of the TWSE.

The aforementioned compensation costs for the equity-settled share-based payment were measured at fair value based on the closing quoted market price of the shares on the grant date, NT$21.8 and NT$53.0 per share, respectively. The unvested restricted stocks issued on the grant date for employees are recognized in unearned employee compensation as a transitional contra equity account and such account shall be amortized as compensation expense over the vesting period. For the years ended December 31, 2020 and 2021, the compensation costs of NT$504 million and NT$1,520 million, respectively, were recognized in expenses by the Company.

c. Stock appreciation right plan for employees

In September 2020 and June 2021, the Company executed a compensation plan to grant 26 million units and 1 million units of cash-settled stock appreciation right to qualified employees of the Company without consideration, respectively. One unit of stock appreciation right to employees represents a right to the intrinsic value of one common share of UMC. The life of the plan is four years. Beginning from the end of two years since the date of grant, those employees who fulfill both service period and performance conditions set by the Company are gradually eligible to the vested stock appreciation right at certain percentage and time frame. For those employees who fail to fulfill the vesting conditions, the Company will withdraw their rights without consideration. During the vesting period, the holders of the stock appreciation right are not entitled the same rights as those of common stock holders of UMC.

The compensation cost for the cash-settled share-based payment was measured at fair value on the grant date by using Black-Scholes Option Pricing Model and will be remeasured at the end of each reporting period until settlement. As of December 31, 2021, the assumptions used are as below:

	Granted in September 2020		Granted in June 2021
Share price of measurement date (NT$/ per share)	$	65.00	$	65.00
Expected volatility		40.11%-42.88%		38.52%-47.75%
Expected life		0.67-2.67 years		1.44-3.44 years
Expected dividend yield		5.27%		5.27%
Risk-free interest rate		0.32%-0.46%		0.38%-0.50%

For the years ended December 31, 2020 and 2021, the compensation costs of NT$80 million and NT$271 million, respectively, were recognized in expenses by the Company. As of December 31, 2020 and 2021, the liabilities for stock appreciation right recognized which were classified under other payables and other noncurrent liabilities amounted to NT$81 million and NT$352 million, respectively. The intrinsic value for the liabilities of vested rights were both nil.

(20) Operating Revenues

a. Disaggregation of revenue

i. By product

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Wafer	$	142,625,019	$	169,885,201	$	204,594,399
Others		5,576,622		6,935,713		8,416,619
Total	$	148,201,641	$	176,820,914	$	213,011,018

ii. By geography 

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Taiwan	$	53,966,435	$	65,003,509	$	80,655,096
Singapore		23,979,343		26,054,856		29,068,748
China (includes Hong Kong)		19,115,188		22,629,388		31,176,136
Japan		9,855,772		15,363,352		13,705,192
USA		19,957,615		24,546,963		24,270,210
Europe		6,900,339		6,416,235		5,628,998
Others		14,426,949		16,806,611		28,506,638
Total	$	148,201,641	$	176,820,914	$	213,011,018

The geographic breakdown of the Company’s operating revenues was based on the location of the Company’s customers.

iii. By the timing of revenue recognition

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
At a point in time	$	147,057,035	$	174,492,036	$	211,074,982
Over time		1,144,606		2,328,878		1,936,036
Total	$	148,201,641	$	176,820,914	$	213,011,018

b. Contract balances

i. Contract assets, current

	As of January 1,			As of December 31,
	2020			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Sales of goods and services	$	599,491		$	625,222		$	677,326
Less: Loss allowance		(385,248	)		(367,381	)		(357,705	)
Net	$	214,243		$	257,841		$	319,621

The loss allowance was assessed by the Company primarily at an amount equal to lifetime expected credit losses. The loss allowance was mainly resulted from the suspension of the joint technology development agreement as disclosed in Note 9(7).

ii. Contract liabilities

	As of January 1,		As of December 31,
	2020		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Sales of goods and services	$	1,470,195	$	2,497,469	$	4,083,140
Current	$	988,115	$	2,040,989	$	3,441,754
Non-current		482,080		456,480		641,386
Total	$	1,470,195	$	2,497,469	$	4,083,140

The movement of contract liabilities is mainly caused by the timing difference of the satisfaction of a performance of obligation and the consideration received from customers.

The Company recognized NT$706 million and NT$1,416 million, respectively, in revenues from the contract liabilities balance at the beginning of the period as performance obligations were satisfied for the years ended December 31, 2020 and 2021.

c. The Company’s transaction price allocated to unsatisfied performance obligations amounted to NT$2,759 million and NT$167 million as of December 31, 2020 and 2021, respectively. The Company will recognize revenue as the Company satisfies its performance obligations over time that aligns with progress toward completion of a contract in the future. As of the report date, partial contract was due in May 2021. The estimate of the transaction price does not include any estimated amounts of variable consideration that are constrained.

d. Asset recognized from costs to fulfill a contract with customer

As of December 31, 2020 and 2021, the Company recognized costs to fulfill engineering service contracts eligible for capitalization as other current assets which amounted to NT$549 million and NT$612 million, respectively. Subsequently, the Company will expense from costs to fulfill a contract to operating costs when the related obligations are satisfied.

(21) Operating Costs and Expenses

The Company’s employee benefit, depreciation and amortization expenses are summarized as follows:

	For the years ended December 31,
	2019						2020						2021
	Operating costs		Operating expenses		Total		Operating costs		Operating expenses		Total		Operating costs		Operating expenses		Total
	NT$						NT$						NT$
	(In Thousands)						(In Thousands)						(In Thousands)
Employee benefit expenses
Salaries	$	17,109,432	$	7,712,792	$	24,822,224	$	20,367,325	$	9,412,151	$	29,779,476	$	23,388,888	$	11,806,207	$	35,195,095
Labor and health insurance		911,037		395,571		1,306,608		1,061,848		452,848		1,514,696		1,183,315		458,179		1,641,494
Pension		1,066,877		361,281		1,428,158		1,138,429		379,298		1,517,727		1,259,044		399,879		1,658,923
Other employee benefit expenses		303,358		124,631		427,989		274,838		121,858		396,696		335,829		144,668		480,497
Depreciation		45,068,673		1,841,954		46,910,627		43,969,732		1,926,226		45,895,958		42,002,745		1,908,719		43,911,464
Amortization		848,214		1,368,440		2,216,654		895,732		1,848,651		2,744,383		834,384		2,060,558		2,894,942

According to UMC’s Articles of Incorporation, the employees and directors’ compensation shall be distributed in the following order:

UMC shall allocate no less than 5% of profit as employees’ compensation and no more than 0.2% of profit as directors’ compensation for each profitable fiscal year after offsetting any cumulative losses. The aforementioned employees’ compensation will be distributed in shares or cash. The employees of UMC’s subsidiaries who fulfill specific requirements stipulated by the Board of Directors may be granted such compensation. Directors may only receive compensation in cash. UMC may, by a resolution adopted by a majority vote at a meeting of the Board of Directors attended by two-thirds of the total number of directors, distribute the aforementioned employees and directors’ compensation and report to the shareholders’ meeting for such distribution.

The Company recognizes the employees and directors’ compensation in the profit or loss during the periods when earned for the years ended December 31, 2019, 2020 and 2021. The Board of Directors estimates the amount by taking into consideration the Articles of Incorporation, government regulations and industry averages. If the Board of Directors resolves to distribute employee compensation through stock, the number of stock distributed is calculated based on total employee compensation divided by the closing price of the day before the Board of Directors’ meeting. If the Board of Directors subsequently modifies the estimates significantly, the Company will recognize the change as an adjustment in the profit or loss in the subsequent period.

The distributions of employees and directors’ compensation for 2019 and 2020 were reported to the shareholders’ meeting on June 10, 2020 and July 7, 2021, respectively, while the distributions of employees and directors’ compensation for 2021 were approved through the Board of Directors’ meeting on February 24, 2022. The details of distribution were as follows:

	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Employees’ compensation – Cash	$	1,132,952	$	2,581,675	$	4,770,909
Directors’ compensation		10,259		32,369		25,264

The aforementioned employees and directors’ compensation for 2019 and 2020 reported during the shareholders’ meeting were consistent with the resolutions of the Board of Directors’ meeting held on February 26, 2020 and February 24, 2021, respectively.

Information relevant to the aforementioned employees and directors’ compensation can be obtained from the “Market Observation Post System” on the website of the TWSE.

(22) Net Other Operating Income and Expenses

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Government grants	$	5,366,907		$	5,179,643		$	5,269,412
Rental income from property, plant and equipment		200,351			198,860			187,166
Gain on disposal of property, plant and equipment		43,036			1,137,320			143,735
Impairment loss
Property, plant and equipment		(84,974	)		—			—
Goodwill		(7,398	)		—			—
Others		(335,760	)		(261,933	)		(373,482	)
Total	$	5,182,162		$	6,253,890		$	5,226,831

(23) Non-Operating Income and Expenses

a. Other gains and losses

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Gain on valuation of financial assets and liabilities at fair value through profit or loss	$	1,279,931		$	2,011,403		$	2,892,470
Impairment loss
Investments accounted for under the equity method		(25,762	)		—			—
Loss on disposal of investments		(16,293	)		(91,070	)		(16,388	)
Others		(71,147	)		(1,871,567	)		(2,009,952	)
Total	$	1,166,729		$	48,766		$	866,130

Others included the one-time payment to MICRON TECHNOLOGY, INC. (MICRON) due to the worldwide settle agreement between UMC and MICRON (Please refer to Note 9(7)) and the losses of financial instrument transaction recognized in 2021, and the losses for the settlement approved by the U.S. Department of Justice regarding allegation of conspiracy to engage in theft of trade secrets recognized in 2020, respectively.

b. Finance costs

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Interest expenses
Bonds payable	$	672,902	$	377,193	$	437,055
Bank loans		1,808,633		1,417,028		1,285,708
Lease liabilities		178,112		154,730		145,187
Others		274,168		55,467		139
Financial expenses		63,828		69,015		94,841
Total	$	2,997,643	$	2,073,433	$	1,962,930

	For the year ended December 31, 2019
	Arising during the period			Reclassification adjustments during the period		Other comprehensive income (loss), before tax			Income tax effect			Other comprehensive income (loss), net of tax
	NT$			NT$		NT$			NT$			NT$
	(In Thousands)			(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit pension plans	$	106,403		$	—	$	106,403		$	(21,281	)	$	85,122
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		5,486,209			—		5,486,209			(394,695	)		5,091,514
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		899,025			—		899,025			(41,643	)		857,382
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(3,292,023	)		14,085		(3,277,938	)		14,949			(3,262,989	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		8,799			6,594		15,393			(8,843	)		6,550
Total other comprehensive income (loss)	$	3,208,413		$	20,679	$	3,229,092		$	(451,513	)	$	2,777,579

	For the year ended December 31, 2020
	Arising during the period			Reclassification adjustments during the period			Other comprehensive income (loss), before tax			Income tax effect			Other comprehensive income (loss), net of tax
	NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit pension plans	$	(192,581	)	$	—		$	(192,581	)	$	38,516		$	(154,065	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		4,815,361			—			4,815,361			(134,887	)		4,680,474
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		883,508			—			883,508			(115,048	)		768,460
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(2,917,361	)		(2,919	)		(2,920,280	)		38,541			(2,881,739	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		37,474			22,843			60,317			7,372			67,689
Total other comprehensive income (loss)	$	2,626,401		$	19,924		$	2,646,325		$	(165,506	)	$	2,480,819

	For the year ended December 31, 2021
	Arising during the period			Reclassification adjustments during the period			Other comprehensive income (loss), before tax			Income tax effect			Other comprehensive income (loss), net of tax
	NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit pension plans	$	(197,477	)	$	—		$	(197,477	)	$	39,495		$	(157,982	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		5,811,342			—			5,811,342			(360,061	)		5,451,281
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		2,959,130			—			2,959,130			(96,510	)		2,862,620
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(4,743,299	)		2,283			(4,741,016	)		23,175			(4,717,841	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		(24,018	)		(394	)		(24,412	)		6,763			(17,649	)
Total other comprehensive income (loss)	$	3,805,678		$	1,889		$	3,807,567		$	(387,138	)	$	3,420,429

(25) Income Tax

a. The major components of income tax expense (benefit) for the years ended December 31, 2019, 2020 and 2021 were as follows:

i. Income tax expense (benefit) recorded in profit or loss

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Current income tax expense (benefit):
Current income tax charge	$	772,795		$	2,346,937		$	7,088,975
Adjustments in respect of current income tax of prior periods		(1,033,780	)		(1,140,060	)		(150,260	)
Deferred income tax expense (benefit):
Deferred income tax related to origination and reversal of temporary differences		465,530			49,035			407,280
Deferred income tax related to recognition and derecognition of tax losses and unused tax credits		231,971			683,080			723,270
Adjustment of prior year’s deferred income tax		121,189			(246,173	)		(130,841	)
Deferred income tax arising from write-down or reversal of write-down of deferred tax assets		(327,359	)		(1,736	)		(20,172	)
Income tax expense recorded in profit or loss	$	230,346		$	1,691,083		$	7,918,252

ii. Deferred income tax related to components of other comprehensive income (loss)

(i) Items that will not be reclassified subsequently to profit or loss:

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Remeasurements of defined benefit pension plans	$	(21,281	)	$	38,516		$	39,495
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		(394,695	)		(134,887	)		(360,061	)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		(41,643	)		(115,048	)		(96,510	)
Income tax related to items that will not be reclassified subsequently to profit or loss	$	(457,619	)	$	(211,419	)	$	(417,076	)

(ii) Items that may be reclassified subsequently to profit or loss:

	For the years ended December 31,
	2019			2020		2021
	NT$			NT$		NT$
	(In Thousands)			(In Thousands)		(In Thousands)
Exchange differences on translation of foreign operations	$	14,949		$	38,541	$	23,175
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		(8,843	)		7,372		6,763
Income tax related to items that may be reclassified subsequently to profit or loss	$	6,106		$	45,913	$	29,938

iii.   Income tax charged directly to equity    

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Current income tax expense (benefit):
Disposal of parent company’s stock by subsidiary recognized as treasury stock transactions	$	—		$	—		$	(203	)
Deferred income tax expense (benefit):
Recognize (reversal) of temporary difference arising from initial recognition of the equity component of the compound financial instrument		(45	)		3,691			—
Adjustments of changes in net assets of associates and joint ventures accounted for using equity method		(532	)		(91	)		22
Gains or losses on hedging instruments which will not be reclassified subsequently to profit or loss		(514	)		—			—
Income tax charged directly to equity	$	(1,091	)	$	3,600		$	(181	)

b. A reconciliation between income tax expense (benefit) and income before tax at UMC’s applicable tax rate were as follows:

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Income before tax	$	4,806,596		$	22,542,750		$	58,496,432
At UMC’s statutory income tax rate		961,319			4,508,550			11,699,286
Adjustments in respect of current income tax of prior periods		(1,033,780	)		(1,140,060	)		(150,260	)
Net changes in loss carry-forward and investment tax credits		2,387,922			447,570			(845,267	)
Adjustment of deferred tax assets/liabilities for write-downs/reversals and different jurisdictional tax rates		(169,568	)		(505,537	)		183,123
Tax effect of non-taxable income and non-deductible expenses:
Tax exempt income		(1,778,820	)		(2,500,688	)		(3,258,695	)
Investment gain		(270,610	)		(431,501	)		(1,388,877	)
Dividend income		(139,093	)		(130,672	)		(171,725	)
Others		110,991			32,268			6,463
Basic tax		3,215			2,803			—
Estimated income tax on unappropriated earnings		150,401			1,087,216			1,558,031
Effect of different tax rates applicable to UMC and its subsidiaries		(102,608	)		(191,687	)		116,174
Taxes withheld in other jurisdictions		19,749			25,193			43,443
Others		91,228			487,628			126,556
Income tax expense recorded in profit or loss	$	230,346		$	1,691,083		$	7,918,252

c. Significant components of deferred income tax assets and liabilities were as follows:

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Deferred income tax assets
Depreciation	$	2,116,855		$	2,155,961
Loss carry-forward		685,531			62,367
Pension		828,410			770,847
Refund liabilities		240,165			140,861
Allowance for inventory valuation losses		595,910			433,630
Investment loss		389,743			349,794
Unrealized profit on intercompany sales		1,348,202			1,125,370
Others		461,160			439,439
Total deferred income tax assets		6,665,976			5,478,269
Deferred income tax liabilities
Unrealized exchange gain		(559,334	)		(580,191	)
Depreciation		(156,000	)		(78,792	)
Investment gain		(933,038	)		(1,354,740	)
Bonds		—			(6,353	)
Amortizable assets		(316,049	)		(303,841	)
Others		(687	)		—
Total deferred income tax liabilities		(1,965,108	)		(2,323,917	)
Net deferred income tax assets	$	4,700,868		$	3,154,352

d. Movement of deferred tax

	For the years ended December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Balance as of January 1	$	5,342,127		$	4,700,868
Amounts recognized in profit or loss during the period		(484,206	)		(979,537	)
Amounts recognized in other comprehensive income (loss)		(165,506	)		(387,138	)
Amounts recognized in equity		3,600			22
Exchange adjustments		4,853			(179,863	)
Balance as of December 31	$	4,700,868		$	3,154,352

e. The Company is subject to taxation in Taiwan and other foreign jurisdictions. As of December 31, 2021, income tax returns of UMC and its subsidiaries in Taiwan have been examined by the tax authorities through 2018, while in other foreign jurisdictions, relevant tax authorities have completed the examination through 2012. There is an uncertain tax position that the outcome of the income tax returns of certain companies within the Company may not be accepted by the tax authorities of the respective countries of operations. For the recognition and measurement of deferred income tax and current income tax which involved significant accounting judgments, estimates and assumptions, please refer to Note 5(3).

f. UMC was granted income tax exemption for several periods with respect to income derived from the expansion of operations. The income tax exemption had expired on December 31, 2020.

g. UMC’s branch in Singapore obtained two tax incentives granted by the Singapore government for a period of five years from August 2020. The qualifying incomes are either tax-exempt or taxed at concessionary tax rate. The incentive period will end in July 2025.

h. The information of the unused tax loss carry-forward for which no deferred income tax assets have been recognized were as follows:

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Expiry period
1-5 years	$	40,910,279	$	38,562,420
6-10 years		2,674,422		2,730,567
Total	$	43,584,701	$	41,292,987

i. As of December 31, 2020 and 2021, deductible temporary differences for which no deferred income tax assets have been recognized amounted to NT$2,942 million and NT$4,433 million, respectively.

j. As of December 31, 2020 and 2021, the taxable temporary differences of unrecognized deferred tax liabilities associated with investments in subsidiaries amounted to NT$11,463 million and NT$14,904 million, respectively.

(26) Earnings Per Share

a. Earnings per share-basic

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	8,155,097	$	22,860,744	$	51,246,425
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)		11,565,068		11,850,052		12,005,126
Earnings per share-basic (NTD)	$	0.71	$	1.93	$	4.27

b. Earnings per share-diluted

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	8,155,097	$	22,860,744	$	51,246,425
Effect of dilution
Unsecured convertible bonds		289,121		69,019		—
Income attributable to shareholders of the parent	$	8,444,218	$	22,929,763	$	51,246,425
Weighted—average number of ordinary shares for basic earnings per share (thousand shares)		11,565,068		11,850,052		12,005,126
Effect of dilution
Restricted stocks for employees		—		30,911		159,478
Employees’ compensation		90,047		65,657		80,243
Unsecured convertible bonds		1,295,729		303,630		—
Weighted—average number of ordinary shares after dilution (thousand shares)		12,950,844		12,250,250		12,244,847
Earnings per share-diluted (NTD)	$	0.65	$	1.87	$	4.19

(27) Reconciliation of Liabilities Arising from Financing Activities

For the year ended December 31, 2019

	As of December 31, 2018		Cash Flows			Non-cash changes						As of December 31, 2019
Items						Foreign exchange			Others (Note A)
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	13,103,808	$	(993,723	)	$	(368,507	)	$	273,628		$	12,015,206
Long-term loans (current portion included)		30,826,215		3,876,991			(802,975	)		1,843			33,902,074
Bonds payable (current portion included)		41,378,182		(2,500,000	)		—			(96,766	)		38,781,416
Guarantee deposits (current portion included)		665,793		252,269			(2,021	)		(619,347	)		296,694 (Note E	)
Lease liabilities		6,006,457		(633,488	)		(78,432	)		736,488 (Note C	)		6,031,025
Other financial liabilities-noncurrent (Note B)		20,410,355		—			(698,127	)		381,213			20,093,441

For the year ended December 31, 2020

						Non-cash changes
Items	As of December 31, 2019		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2020
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	12,015,206	$	(933,392	)	$	(75,751	)	$	51,069		$	11,057,132
Long-term loans (current portion included)		33,902,074		136,920			(972,888	)		—			33,066,106
Bonds payable (current portion included)		38,781,416		(13,702,875	)		—			(6,388,157 (Note D	)  )		18,690,384
Guarantee deposits (current portion included)		296,694		(59,819	)		(883	)		—			235,992 (Note E	)
Lease liabilities		6,031,025		(726,626	)		(10,036	)		282,501			5,576,864
Other financial liabilities-noncurrent (Note B)		20,093,441		—			281,219			371,964			20,746,624

For the year ended December 31, 2021

						Non-cash changes
Items	As of December 31, 2020		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2021
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	11,057,132	$	(8,974,216	)	$	(158,792	)	$	—		$	1,924,124
Long-term loans (current portion included)		33,066,106		4,088,537			(529,736	)		—			36,624,907
Bonds payable (current portion included)		18,690,384		23,703,692			—			(1,857,418 (Note F	)  )		40,536,658
Guarantee deposits (current portion included)		235,992		14,219,408			(85,631	)		—			14,369,769 (Note E	)
Lease liabilities		5,576,864		(699,680	)		(144,419	)		335,989			5,068,754
Other financial liabilities (Note B)		20,746,624		—			(163,387	)		382,972			20,966,209

Note A: Other non-cash changes mainly consisted of discount amortization measured by the effective interest method.

Note B: Please refer to Note 9(6) for more details on other financial liabilities.

Note C: Including the impact from acquisition of a subsidiary.

Note D: Please refer to Note 6(13) for the Company’s convertible bonds.

Note E: Guarantee deposits mainly consisted of deposits of capacity reservation.

Note F: Please refer to Note 6(13) for the Company’s exchangeable bonds.

(28) Business Combinations

UNITED SEMICONDUCTOR JAPAN CO., LTD. (USJC)

The Company exercised the call option of a joint venture agreement between FUJI SEMICONDUCTOR LIMITED (FSL) to acquire 84.1% ownership interest in MIE FUJITSU SEMICONDUCTOR LIMITED (MIFS) for JPY 54.4 billion on October 1, 2019. The Company previously held 15.9% of ownership interest in MIFS. MIFS became a wholly-owned subsidiary of the Company and was renamed as USJC upon completion of the acquisition. USJC is a 300mm fab in Japan that is currently manufacturing 90nm, 65nm and 40nm products. The fab fits the Company’s specialty technology focus and long-term growth projections. USJC will increase the Company’s foundry market share, provide business synergies and benefit from economies of scale while broadening the Company’s comprehensive specialty and logic technologies to serve Japanese and international customers.

The fair value of the net identifiable assets acquired and liabilities assumed was in excess of the aggregate consideration transferred and the previously held ownership interest of 15.9% in USJC at the acquisition date, and the difference was recognized as bargain purchase gain. The previously held ownership interest of 15.9% in USJC was previously accounted for as financial assets at fair value through other comprehensive income, non-current. It was subsequently remeasured at fair value with the consideration for a minority interest discount on the acquisition date resulting in the bargain purchase gain. Upon the acquisition, the Company recognized a loss on disposal of NT$375 million and the accumulated unrealized losses on the previously held ownership interest was reclassified from other comprehensive income to retained earnings for the year ended December 31, 2019.

Upon the acquisition, USJC contributed NT$4,277 million of operating revenues and NT$305 million to profit before tax from continuing operations of the Company, respectively, for the year ended December 31, 2019. If the combination had taken place at the beginning of the year, operating revenues from the continuing operations would have been NT$160,767 million and the profit before tax from continuing operations for the Company would have been NT$5,606 million, respectively, for the year ended December 31, 2019.

(29) Deconsolidation of Subsidiaries

NEXPOWER TECHNOLOGY CORP. (NEXPOWER)

NEXPOWER, the subsidiary of UMC, was resolved for dissolution and liquidation by the shareholders’ meeting on November 11, 2020 and the liquidator took control on the same day. According to IFRS 10, the Company has lost control over NEXPOWER and therefore derecognized its relevant assets and liabilities at the date when the control was lost.

a. Derecognized assets and liabilities mainly consisted of:

	NT$
	(In Thousands)
Assets
Cash and cash equivalents	$	776,586
Other current assets		18
		776,604
Liabilities
Other payables		(194	)
		(194	)
Net assets of the deconsolidation	$	776,410

b. Consideration received and gain recognized from the deconsolidation:

	NT$
	(In Thousands)
Cash received	$	722,559
Less: Net assets of the deconsolidation		(776,410	)
Add: Non-controlling interests		51,565
Other comprehensive income from equity reclassified to profit or loss due to derecognition		4,061
Gain on deconsolidation (Note A)	$	1,775

Note A: Gain on deconsolidation was recognized as other gains and losses in the consolidated statement of comprehensive income.

c. Analysis of net cash outflow arising from deconsolidation of the subsidiary:

	NT$
	(In Thousands)
Cash received	$	722,559
Net cash of subsidiary derecognized		(776,586	)
Net cash outflow from deconsolidation	$	(54,027	)

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Significant Related Party Transactions

12 Months Ended

Dec. 31, 2021

Disclosure of transactions between related parties [abstract]

Significant Related Party Transactions

7. SIGNIFICANT RELATED PARTY TRANSACTIONS

a. Significant intercompany transactions between consolidated entities were as follows:

For the year ended December 31, 2019

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	47,736,335		Net 60 days
UMC	UMC-USA	Accounts receivable		5,937,706		—
UMC	UMC GROUP JAPAN	Sales		3,933,964		Net 60 days
UMC	UMC GROUP JAPAN	Accounts receivable		608,622		—
UMC	USCXM	Sales		1,209,310 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		31,334		—
UMC	USCXM	Loan receivable		1,201,200		—
USCXM	UMC-USA	Sales		745,226		Net 60 days
USCXM	UMC-USA	Accounts receivable		33,242		—
HJ	UMC-USA	Sales		152,012		Net 60 days
HJ	UMC-USA	Accounts receivable		21,138		—
HJ	UMC GROUP JAPAN	Sales		250,736		Net 60 days
HJ	UMC GROUP JAPAN	Accounts receivable		51,150		—

For the year ended December 31, 2020

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	49,357,981		Net 60 days
UMC	UMC-USA	Accounts receivable		5,388,172		—
UMC	UMC GROUP JAPAN	Sales		1,220,419		Net 60 days
UMC	USCXM	Sales		1,183,180 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		24,831		—
USCXM	UMC-USA	Sales		970,358		Net 60 days
USCXM	UMC-USA	Accounts receivable		250,092		—
HJ	UMC-USA	Sales		137,860		Net 60 days
HJ	UMC-USA	Accounts receivable		33,069		—
HJ	UMC GROUP JAPAN	Sales		106,077		Net 60 days
USJC	UMC-USA	Sales		1,395,094		Net 60 days
USJC	UMC-USA	Accounts receivable		456,860		—

For the year ended December 31, 2021

Entity	Counterparty	Transactions (Note D)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	48,440,369		Net 60 days
UMC	UMC-USA	Accounts receivable		6,286,428		—
UMC	USCXM	Sales		1,222,320 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		29,012		—
UMC	UDS	Sales		178,331		Net 30 days
UMC	UDS	Accounts receivable		18,818		—
USJC	UMC-USA	Sales		2,917,993		Net 60 days
USJC	UMC-USA	Accounts receivable		428,363		—
USCXM	UMC-USA	Sales		1,444,736		Net 60 days
USCXM	UMC-USA	Accounts receivable		221,375		—
WAVETEK	UMC-USA	Sales		545,785		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		126,580		—
WAVETEK	UMC	Sales		110,620		Month-end 30 days
HJ	UMC-USA	Sales		366,968		Net 60 days
HJ	UMC-USA	Accounts receivable		60,147		—

Note A: The significant intercompany transactions listed above include downstream transactions.

Note B: The sales price to the above related parties was determined through mutual agreement in reference to market conditions.

Note C: UMC authorized technology licenses to its subsidiary, USCXM, in the amount of US$0.35 billion, which was recognized as deferred revenue to be realized over time.

Note D: The significant intercompany transactions listed above include downstream and upstream transactions.

b. Significant transactions between the Company and other related parties were as follows:

(i) Name and Relationship of Related Parties

Name of related parties	Relationship with the Company
FARADAY TECHNOLOGY CORP. and its Subsidiaries	Associate
HSUN CHIEH INVESTMENT CO., LTD.	Associate
HSUN CHIEH CAPITAL CORP.	Associate
TRIKNIGHT CAPITAL CORPORATION	Associate
UNIMICRON TECHNOLOGY CORP.	Associate
SILICON INTEGRATED SYSTEMS CORP.	The Company’s director
PHOTRONICS DNP MASK CORPORATION	Other related parties
UNITEDVISION SEMICONDUCTOR CO., LTD.	Other related parties
UPI SEMICONDUCTOR CORP.	Other related parties
UNISTARS CORPORATION	Other related parties

(ii) Operating revenues

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	1,532,339	$	2,085,425	$	2,778,544
Others		45,523		26,856		38,797
Total	$	1,577,862	$	2,112,281	$	2,817,341

(iii) Accounts receivable, net

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	172,808	$	555,064
Others		6,110		11,274
Total	$	178,918	$	566,338

The sales price to the above related parties was determined through mutual agreement in reference to market conditions. The collection periods for domestic sales to related parties were month-end 30-60 days, while the collection periods for overseas sales were month-end or net 30-60 days.

(iv) Refund liabilities (classified under other current liabilities)

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	1,186	$	1,841
Others		36		27
Total	$	1,222	$	1,868

(v) Significant asset transactions

Acquisition of financial assets at fair value through profit or loss, noncurrent

					For the year ended December 31, 2019
	Trading Volume (In thousands of shares)		Transaction underlying		Purchase price
					NT$
					(In Thousands)
Associates		500		Stock of MATERIALS ANALYSIS TECHNOLOGY INC.	$	32,923
Associates		1,900		Stock of GEAR RADIO LTD.		37,211
Total					$	70,134

				For the year ended December 31, 2020
	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		1,000	Stock of WELLYSUN INC.	$	25,000

				For the year ended December 31, 2021
	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		82	Stock of ARTERY TECHNOLOGY CORPORATION	$	13,929

Acquisition of investments accounted for under the equity method

				For the year ended December 31, 2019
	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		72,000	Stock	$	720,000

For the years ended December 31, 2020 and 2021: None.

Acquisition of intangible assets

	Purchase price
	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	339,463	$	335,425	$	181,254

(vi)   Others
Mask expenditure
	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Others	$	2,346,263	$	1,811,827	$	1,861,438

Other payables of mask expenditure
	As of December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Others	$	683,892	$	532,810	$	560,042

c. Key management personnel compensation

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Short-term employee benefits	$	271,135	$	435,251	$	562,117
Post-employment benefits		2,406		2,458		2,322
Termination benefits		3,415		283		—
Share-based payment		62,203		365,666		1,035,401
Others		578		571		578
Total	$	339,737	$	804,229	$	1,600,418

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Assets Pledged as Collateral

12 Months Ended

Dec. 31, 2021

Disclosure Of Assets Pledged As Collateral [Abstract]

Assets Pledged as Collateral

8. ASSETS PLEDGED AS COLLATERAL

The following table lists assets of the Company pledged as collateral:

	As of December 31,
	2020		2021		Party to which asset(s) was pledged	Purpose of pledge
	NT$		NT$
	(In Thousands)		(In Thousands)
Refundable Deposits (Time deposit)	$	811,072	$	811,660	Customs	Customs duty guarantee
Refundable Deposits (Time deposit)		234,286		234,304	Science Park Bureau	Collateral for land lease
Refundable Deposits (Time deposit)		18,215		20,619	Science Park Bureau	Collateral for dormitory lease
Refundable Deposits (Time deposit)		41,785		26,600	Liquefied Natural Gas Business Division, CPC Corporation, Taiwan	Energy resources guarantee

	As of December 31,
	2020		2021		Party to which asset(s) was pledged	Purpose of pledge
	NT$		NT$
	(In Thousands)		(In Thousands)
Refundable Deposits (Time deposit)		1,000,000		1,151,200	Bank of China and Agricultural Bank of China	Bank performance guarantee
Refundable Deposits (Bank deposit)		—		6,711	Shanghai Commercial Bank	Collateral for letter of credit
Buildings		5,310,769		5,014,814	Taiwan Cooperative Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Machinery and equipment		21,370,450		25,189,533	Taiwan Cooperative Bank, Mega International Commercial Bank, KGI Bank, First Commercial Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Transportation equipment		3,174		1,802	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Furniture and fixtures		281,663		161,604	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Right-of-use assets		289,552		280,697	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Total	$	29,360,966	$	32,899,544

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Significant Contingencies and Unrecognized Contract Commitments

12 Months Ended

Dec. 31, 2021

Significant Contingencies And Unrecognized Contract Commitments [Abstract]

Significant Contingencies and Unrecognized Contract Commitments

9. SIGNIFICANT CONTINGENCIES AND UNRECOGNIZED CONTRACT COMMITMENTS

(1) As of December 31, 2021, amounts available under unused letters of credit for importing machinery and equipment were NT$0.3 billion.

(2) As of December 31, 2021, the Company entrusted financial institutions to open performance guarantee, mainly related to the litigations and customs tax guarantee, amounting to NT$1.6 billion.

(3) The Company entered into several patent license agreements and development contracts of intellectual property for a total contract amount of approximately NT$2.8 billion. As of December 31, 2021, the portion of royalties and development fees not yet recognized was NT$0.9 billion.

(4) The Company entered into several construction contracts for the expansion of its operations. As of December 31, 2021, these construction contracts amounted to approximately NT$19.6 billion and the portion of the contracts not yet recognized was approximately NT$14.4 billion.

(5) The Company entered into several wafer-processing contracts with its customers. According to the contracts, the Company shall provide agreed production capacity with the customers.

(6) The Board of Directors of UMC resolved in October 2014 to participate in a 3-way agreement with Xiamen Municipal People’s Government and FUJIAN ELECTRONIC & INFORMATION GROUP to form a company which will focus on 12’’ wafer foundry services. The Company obtained R.O.C. government authority’s approval for the investment and invested RMB¥8.3 billion in USCXM in instalments from January 2015 to September 2018, according to the agreement that the Company obtained the ability to exercise control. Furthermore, based on the agreement, UMC recognized a financial liability in other financial liabilities, current and other noncurrent liabilities, respectively for the purchase from the other investors of their investments in USCXM at their original investment cost plus interest totally amounting to RMB¥4.9 billion, beginning from the seventh year (2022) following the last instalment payment made by the other investors. Accordingly, the Company recognizes non-controlling interests as required by IFRS 10 during the reporting period. At the end of each reporting period, the Company recognizes a financial liability for its commitment to the other investors in accordance with IFRS 9, at the same time derecognizing the non-controlling interests. Any difference between the financial liability and the non-controlling interests balance is recognized in equity.

(7) On August 31, 2017, the Taichung District Prosecutors Office indicted UMC based on the Trade Secret Act of R.O.C., alleging that employees of UMC misappropriated the trade secrets of MICRON TECHNOLOGY, INC. (“MICRON”). On June 12, 2020, an adverse ruling issued by the District Court of Taichung in a suit alleged that UMC, two of its current employees and a former employee engaged in the misappropriation of trade secrets. UMC appealed against the sentence. On November 26, 2021, UMC and MICRON announced a settlement agreement between the two companies for all legal proceedings worldwide (the “Settlement Agreement”). Accordingly, MICRON submitted a motion to withdraw the case. On January 27, 2022, the Intellectual Property and Commercial Court announced its ruling of this case and UMC was sentenced to a fine of NT$20 million, subject to a two-year term of probation.

 

On December 5, 2017, MICRON filed a civil action with similar cause against UMC with the United States District Court, Northern District of California. MICRON claimed entitlement to the actual damages, treble damages and relevant fees and requested the court to issue an order that enjoins UMC from using its trade secrets in question. In accordance with the Settlement Agreement, the court issued a dismissal of the case with prejudice in January 2022.

On January 12, 2018, UMC filed three patent infringement actions with the Fuzhou Intermediate People’s Court against, among others, MICRON (XI’AN) CO., LTD. and MICRON (SHANGHAI) TRADING CO., LTD., requesting the court to order the defendants to stop manufacturing, processing, importing, selling, and committing to sell the products deploying the infringing patents in question, and also to destroy all inventories and related molds and tools. On July 3, 2018, the Fuzhou Intermediate People’s Court granted preliminary injunction against the aforementioned two defendants, holding that the two defendants must immediately cease to manufacture, sell, and import products that infringe the patent rights of UMC. The court approved withdrawal of one of the patent infringement actions on our motion while the other two actions are still on trial. In accordance with the Settlement Agreement, UMC submitted a motion to withdraw the case, and the motion is currently pending.

The amounts of aforementioned fine from ruling of the Intellectual Property and Commercial Court and the worldwide settlement between UMC and MICRON were recorded in non-operating other losses and have no material financial and operational effect on UMC’s business for the years presented.

(8) On March 14, 2019, a putative class action complaint was filed in the United States District Court for the Southern District of New York against the Company and certain of its officers and/or directors, alleging violations of Section 10(b) of the Securities Exchange Act and Rule 10b-5 thereunder, arising out of an alleged scheme to misappropriate trade secrets. On May 3, 2021, the court approved the settlement reached between the plaintiffs and the defendants and UMC paid a settlement amount of US$3 million to be allocated to the class plaintiffs and reimbursement of legal fees of class plaintiffs. The settlement has been recorded in non-operating other losses and has no material financial and operational effect on UMC’s business.

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Significant Subsequent Events

12 Months Ended

Dec. 31, 2021

Disclosure of non-adjusting events after reporting period [abstract]

Significant Subsequent Events

10. SIGNIFICANT SUBSEQUENT EVENTS

(1) On January 27, 2022, Intellectual Property and Commercial Court issued a ruling for a suit alleging UMC misappropriated trade secrets. Please refer to Note 9(7) for further information.

(2) On April 27, 2022, the Board of Directors of UMC approved an investment to increase capital of RMB¥4.12 billion or equivalent US dollars (approximately US$0.66 billion) in its Cayman Islands subsidiary, UNITED MICROCHIP CORPORATION, for its Samoa subsidiary, GREEN EARTH LIMITED, to purchase the shares of UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (hereinafter referred to as USCXM) from XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.; in addition, the Company’s subsidiary, HEJIAN TECHNOLOGY (SUZHOU) CO., LTD., plans to purchase shares of USCXM with RMB¥0.74 billion or equivalent US dollars (approximately US$0.12 billion) from FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP. As a result, the total investment amount is RMB¥4.86 billion. The transaction will be completed in three years consecutively from 2022 at the ratio of 60%, 20% and 20%, respectively. Please refer to Note 9(6) for more details.

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Financial Risk and Fair Value Disclosures

12 Months Ended

Dec. 31, 2021

Disclosure of detailed information about financial instruments [abstract]

Financial Risk and Fair Value Disclosures

11. FINANCIAL RISK AND FAIR VALUE DISCLOSURES

(1) Categories of financial instruments

	As of December 31,
Financial Assets	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets at fair value through profit or loss	$	16,042,721	$	20,446,295
Financial assets at fair value through other comprehensive income		10,526,144		19,835,665
Financial assets measured at amortized cost
Cash and cash equivalents (cash on hand excluded)		94,042,271		132,616,447
Receivables		28,942,147		36,047,680
Refundable deposits		2,310,961		2,358,549
Other financial assets		14,386,131		28,863,470
Total	$	166,250,375	$	240,168,106

	As of December 31,
Financial Liabilities	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial liabilities at fair value through profit or loss	$	2,326	$	2,380,599
Financial liabilities measured at amortized cost
Short-term loans		11,057,132		1,924,124
Payables		31,188,794		37,657,300
Guarantee deposits (current portion included)		235,992		14,369,769
Bonds payable (current portion included)		18,690,384		40,536,658
Long-term loans (current portion included)		33,066,106		36,624,907
Lease liabilities		5,576,864		5,068,754
Other financial liabilities		20,746,624		20,966,209
Total	$	120,564,222	$	159,528,320

(2) Financial risk management objectives and policies

The Company’s risk management objectives are to manage the market risk, credit risk and liquidity risk related to its operating activities. The Company identifies, measures and manages the aforementioned risks based on policy and risk preference.

The Company has established appropriate policies, procedures and internal controls for financial risk management. Before entering into significant financial activities, approval process by the Board of Directors and Audit Committee must be carried out based on related protocols and internal control procedures. The Company complies with its financial risk management policies at all times.

(3) Market risk

Market risk is the risk that the fair value or future cash flows of a financial instrument will fluctuate because of changes in market prices. Market risks comprise currency risk, interest rate risk and other price risk (such as equity price risk).

Foreign currency risk

The Company’s exposure to the risk of changes in foreign exchange rates relates primarily to the Company’s operating activities (when revenue or expense is denominated in a different currency from the Company’s functional currency) and the Company’s net investments in foreign subsidiaries.

The Company applies natural hedges on the foreign currency risk arising from purchases or sales, and utilizes spot or forward exchange contracts to manage foreign currency risk and the net effect of the risks related to monetary financial assets and liabilities is minor. The notional amounts of the foreign currency contracts are the same as the amount of the hedged items. In principle, the Company does not carry out any forward exchange contracts for uncertain commitments. Furthermore, as net investments in foreign subsidiaries are for strategic purposes, they are not hedged by the Company.

Certain forward exchange contracts designated by the Company to hedge foreign currency exchange rate risks associated with the purchase of additional shares of USJC in JPY, amounting to JPY 23 billion, expired prior to December 31, 2018. The cash flow hedge reserve in other components of equity, amounting to NT$(3) million, was recognized as consideration for the ownership interest of 84.1% in USJC on October 1, 2019. Please refer to Note 6(28).

The foreign currency sensitivity analysis of the possible change in foreign exchange rates on the Company’s profit is performed on significant monetary items denominated in foreign currencies as of the end of the reporting period. When NTD strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2019, 2020 and 2021 decreases/increases by NT$1,009 million, NT$1,336 million and NT$1,104 million, respectively. When RMB strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2019, 2020 and 2021 increases/decreases by NT$2,200 million, NT$1,625 million and NT$375 million, respectively. When JPY strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2019, 2020 and 2021 decreases/increases by NT$430 million, NT$473 million and NT$434 million, respectively.

Interest rate risk

The Company is exposed to interest rate risk arising from borrowing at floating interest rates. All of the Company’s bonds have fixed interest rates and are measured at amortized cost. As such, changes in interest rates would not affect the future cash flows. On the other hand, as the interest rates of the Company’s short-term and long-term bank loans are floating, changes in interest rates would affect the future cash flows but not the fair value. Please refer to Note 6(11), 6(13) and 6(14) for the range of interest rates of the Company’s bonds and bank loans.

At the reporting dates, a change of 10 basis points of interest rate in a reporting period could cause the profit for the years ended December 31, 2019, 2020 and 2021 to decrease/increase by NT$46 million, NT$44 million and NT$39 million, respectively.

Equity price risk

The Company’s listed and unlisted equity securities and exchange right of the exchangeable bonds issued are susceptible to market price risk arising from uncertainties about future performance of equity markets. The Company’s equity investments are classified as financial assets at fair value through profit or loss and financial assets at fair value through other comprehensive income, while exchange right of the exchangeable bonds issued is classified as financial liabilities at fair value through profit or loss as it does not satisfy the definition of an equity component.

The sensitivity analysis for the equity instruments is based on the change in fair value as of the reporting date. A change of 5% in the price of the aforementioned financial assets at fair value through profit or loss of listed companies could increase/decrease the Company’s profit for the years ended December 31, 2019, 2020 and 2021 by NT$252 million, NT$263 million and NT$393 million, respectively. A change of 5% in the price of the aforementioned financial assets at fair value through other comprehensive income of listed companies could increase/decrease the Company’s other comprehensive income for the years ended December 31, 2019, 2020 and 2021 by NT$671 million, NT$453 million and NT$867 million, respectively.

Please refer to Note 11(7) for sensitivity analysis information of other equity instruments or derivatives that are linked to such equity instruments whose fair value measurement is categorized under Level 3.

(4) Credit risk management

The Company only trades with approved and creditworthy third parties. Where the Company trades with third parties which have less credit, it will request collateral from them. It is the Company’s policy that all customers who wish to trade on credit terms are subject to credit verification procedures. In addition, notes and accounts receivable balances are monitored on an ongoing basis to decrease the Company’s exposure to credit risk.

The Company mitigates the credit risks from financial institutions by limiting its counter parties to only reputable domestic or international financial institutions with good credit standing and spreading its holdings among various financial institutions. The Company’s exposure to credit risk arising from the default of counter-parties is limited to the carrying amount of these instruments.

As of December 31, 2020 and 2021, accounts receivable from the top ten customers represent 62% and 60% of the total accounts receivable of the Company, respectively. The credit concentration risk of other accounts receivable is insignificant.

(5) Liquidity risk management

The Company’s objectives are to maintain a balance between continuity of funding and flexibility through the use of cash and cash equivalents, bank loans, bonds and lease.

The table below summarizes the maturity profile of the Company’s financial liabilities based on the contractual undiscounted payments and contractual maturity:

	As of December 31, 2020
	Less than 1 year			2 to 3 years		4 to 5 years		> 5 years		Total
	NT$			NT$		NT$		NT$		NT$
	(In Thousands)			(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Non-derivative financial liabilities
Short-term loans	$	11,240,785		$	—	$	—	$	—	$	11,240,785
Payables		31,008,010			—		—		—		31,008,010
Guarantee deposits		793			163,618		—		71,581		235,992
Bonds payable		2,374,587			8,484,393		8,563,021		—		19,422,001
Long-term loans		25,885,932			5,889,382		2,424,965		—		34,200,279
Lease liabilities		695,790			1,280,476		1,102,021		3,354,217		6,432,504
Other financial liabilities		—			17,120,418		4,280,333		—		21,400,751
Total	$	71,205,897		$	32,938,287	$	16,370,340	$	3,425,798	$	123,940,322
Derivative financial liabilities
Forward exchange contracts
Gross settlement
Inflow	$	393,442		$	—	$	—	$	—	$	393,442
Outflow		(395,768	)		—		—		—		(395,768	)
Net	$	(2,326	)	$	—	$	—	$	—	$	(2,326	)

	As of December 31, 2021
	Less than 1 year		2 to 3 years		4 to 5 years		> 5 years		Total
	NT$		NT$		NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Non-derivative financial liabilities
Short-term loans	$	1,939,109	$	—	$	—	$	—	$	1,939,109
Payables		37,455,640		—		—		—		37,455,640
Guarantee deposits		108,740		3,432,749		—		10,828,280		14,369,769
Bonds payable (Note)		8,612,255		8,869,431		10,656,506		4,178,008		32,316,200
Long-term loans		21,084,795		2,543,611		11,021,076		5,976,645		40,626,127
Lease liabilities		688,613		1,198,528		1,050,786		2,841,010		5,778,937
Other financial liabilities		12,738,246		8,492,466		—		—		21,230,712
Total	$	82,627,398	$	24,536,785	$	22,728,368	$	23,823,943	$	153,716,494

Note: UMC issued unsecured exchangeable bonds where the bondholders may exchange the bonds at any time on or after October 8, 2021 and prior to June 27, 2026 into Novatek common shares which UMC holds and accounts for as equity instruments investments measured at fair value through other comprehensive income. The balances of equity instruments investments measured at fair value through other comprehensive income was NT$8,482 million as of December 31, 2021. All or any portion of the bonds will be redeemable at put price at the option of bondholders on July 7, 2024 at 98.14% of the principal amount.

(6) Foreign currency risk management

UMC entered into forward exchange contracts for hedging the exchange rate risk arising from the net monetary assets or liabilities denominated in foreign currency. The details of forward exchange contracts entered into by UMC are summarized as follows:

As of December 31, 2020

Type	Notional Amount	Contract Period
Forward exchange contracts	Sell USD 82 million	December 11, 2020-February 5, 2021

As of December 31, 2021

None.

(7) Fair value measurement

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value measurement is based on the presumption that the transaction to sell the asset or transfer the liability takes place either in the principal market for the asset or liability, or in the absence of a principal market, in the most advantageous market for the asset or liability.

The principal or the most advantageous market must be accessible by the Company.

The fair value of an asset or a liability is measured using the assumptions that market participants would use when pricing the asset or liability, assuming that market participants act in their economic best interest.

A fair value measurement of a non-financial asset takes into account a market participant’s ability to generate economic benefits by using the asset in its highest and best use or by selling it to another market participant that would use the asset in its highest and best use.

The Company uses valuation techniques that are appropriate in the circumstances and for which sufficient data are available to measure fair value, maximizing the use of relevant observable inputs and minimizing the use of unobservable inputs.

All assets and liabilities for which fair value is measured or disclosed in the financial statements are categorized within the fair value hierarchy, described as follows, based on the lowest level input that is significant to the fair value measurement as a whole:

Level 1 — Quoted (unadjusted) market prices in active markets for identical assets or liabilities;

Level 2 — Valuation techniques for which the lowest level input that is significant to the fair value measurement is directly or indirectly observable;

Level 3 — Valuation techniques for which the lowest level input that is significant to the fair value measurement is unobservable.

For assets and liabilities that are recognized in the financial statements on a recurring basis, the Company determines whether transfers have occurred between levels in the hierarchy by re-assessing categorization (based on the lowest level input that is significant to the fair value measurement as a whole) at the end of each reporting period.

a. Assets and liabilities measured and recorded at fair value on a recurring basis:

	As of December 31, 2020
	Level 1		Level 2		Level 3		Total
	NT$		NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Financial assets:
Financial assets at fair value through profit or loss, current	$	1,049,334	$	2,384	$	164,916	$	1,216,634
Financial assets at fair value through profit or loss, noncurrent		5,546,320		393,856		8,885,911		14,826,087
Financial assets at fair value through other comprehensive income, noncurrent		9,058,372		—		1,467,772		10,526,144
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		2,326		—		2,326

	As of December 31, 2021
	Level 1		Level 2		Level 3		Total
	NT$		NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Financial assets:
Financial assets at fair value through profit or loss, current	$	761,320	$	—	$	183,701	$	945,021
Financial assets at fair value through profit or loss, noncurrent		9,323,064		497,751		9,680,459		19,501,274
Financial assets at fair value through other comprehensive income, current		8,482,334		—		—		8,482,334
Financial assets at fair value through other comprehensive income, noncurrent		8,849,869		—		2,503,462		11,353,331
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		—		2,380,599		2,380,599

Fair values of financial assets at fair value through profit or loss and financial assets at fair value through other comprehensive income that are categorized into Level 1 are based on the quoted market prices in active markets. If there is no active market, the Company estimates the fair value by using the valuation techniques (income approach and market approach) in consideration of cash flow forecast, recent fund raising activities, valuation of similar companies, individual company’s development, market conditions and other economic indicators. If there are restrictions on the sale or transfer of a financial asset, which are a characteristic of the asset, the fair value of the asset will be determined based on similar but unrestricted financial assets’ quoted market price with appropriate discounts for the restrictions. To measure fair values, if the lowest level input that is significant to the fair value measurement is directly or indirectly observable, then the financial assets are classified as Level 2 of the fair value hierarchy, otherwise as Level 3.

During the years ended December 31, 2020 and 2021, there were no significant transfers between Level 1 and Level 2 fair value measurements.

Reconciliation for fair value measurement in Level 3 fair value hierarchy were as follows:

	Financial assets at fair value through profit or loss															Financial assets at fair value through other comprehensive income
	Common stock			Preferred stock			Funds			Convertible bonds			Total			Common stock		Preferred stock			Total
	NT$			NT$			NT$			NT$			NT$			NT$		NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)			(In Thousands)
As of January 1, 2020	$	2,880,688		$	3,279,294		$	2,011,025		$	104,708		$	8,275,715		$	1,130,430	$	175,494		$	1,305,924
Recognized in profit (loss)		589,664			180,523			19,611			39,648			829,446			—		—			—
Recognized in other comprehensive income (loss)		—			—			—			—			—			167,197		(5,349	)		161,848
Acquisition		547,932			294,251			340,323			303,456			1,485,962			—		—			—
Disposal		(308,041	)		(374,112	)		—			(227,223	)		(909,376	)		—		—			—
Return of capital		(1,903	)		—			—			—			(1,903	)		—		—			—
Transfer out of Level 3		(428,188	)		—			—			—			(428,188	)		—		—			—
Exchange effect		(38,674	)		(100,953	)		(56,943	)		(4,259	)		(200,829	)		—		—			—
As of December 31, 2020	$	3,241,478		$	3,279,003		$	2,314,016		$	216,330		$	9,050,827		$	1,297,627	$	170,145		$	1,467,772

	Financial assets at fair value through profit or loss															Financial assets at fair value through other comprehensive income
	Common stock			Preferred stock			Funds			Convertible bonds			Total			Common stock		Preferred stock			Total
	NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)		NT$ (In Thousands)			NT$ (In Thousands)
As of January 1, 2021	$	3,241,478		$	3,279,003		$	2,314,016		$	216,330		$	9,050,827		$	1,297,627	$	170,145		$	1,467,772
Recognized in profit (loss)		278,951			(818,848	)		1,061,793			(6,895	)		515,001			—		—			—
Recognized in other comprehensive income (loss)		—			—			—			—			—			1,053,976		(18,286	)		1,035,690
Acquisition		695,146			829,751			201,649			111,094			1,837,640			—		—			—
Disposal		(447,915	)		(660,904	)		—			(83,814	)		(1,192,633	)		—		—			—
Return of capital		(252	)		—			(69,084	)		—			(69,336	)		—		—			—
Transfer out of Level 3		(161,564	)		—			—			—			(161,564	)		—		—			—
Exchange effect		(21,518	)		(48,756	)		(43,722	)		(1,779	)		(115,775	)		—		—			—
As of December 31, 2021	$	3,584,326		$	2,580,246		$	3,464,652		$	234,936		$	9,864,160		$	2,351,603	$	151,859		$	2,503,462

	Financial liabilities at fair value through profit or loss
	Derivatives
	NT$ (In Thousands)
As of January 1, 2021	$	—
Recognized in profit (loss)		360,494
Issuance		2,020,105
As of December 31, 2021	$	2,380,599

The total profit (loss) of NT$(113) million, NT$721 million and NT$330 million for the years ended December 31, 2019, 2020 and 2021, were included in profit or loss that is attributable to the change in unrealized gains or losses relating to those financial assets without quoted market prices held at the end of the reporting period.

The total loss of nil, nil and NT$360 million for the years ended December 31, 2019, 2020 and 2021, were included in profit or loss that is attributable to the change in unrealized gains or losses relating to those financial liabilities without quoted market prices held at the end of the reporting period.

The Company’s policy to recognize the transfer into and out of fair value hierarchy levels is based on the event or changes in circumstances that caused the transfer.

Significant unobservable inputs of fair value measurement in Level 3 fair value hierarchy were as follows:

As of December 31, 2020
Category	Valuation technique	Significant unobservable inputs	Quantitative information	Interrelationship between inputs and fair value	Sensitivity analysis of interrelationship between inputs and fair value
Unlisted stock	Market Approach	Discount for lack of marketability	0%-50%	The greater degree of lack of marketability, the lower the estimated fair value is determined.	A change of 5% in the discount for lack of marketability of the aforementioned fair values of unlisted stocks could decrease/increase the Company’s profit (loss) for the year ended December 31, 2020 by NT$283 million and NT$231 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2020 by NT$106 million.

As of December 31, 2021
Category	Valuation technique	Significant unobservable inputs	Quantitative information	Interrelationship between inputs and fair value	Sensitivity analysis of interrelationship between inputs and fair value
Unlisted stock	Market Approach	Discount for lack of marketability	0%-50%	The greater degree of lack of marketability, the lower the estimated fair value is determined.	A change of 5% in the discount for lack of marketability of the aforementioned fair values of unlisted stocks could decrease/increase the Company’s profit (loss) for the year ended December 31, 2021 by NT$281 million and NT$242 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2021 by NT$186 million.
Embedded derivatives in exchangeable bonds	Binomial tree valuation model	Volatility	45.84%	The higher the volatility, the higher the estimated fair value is determined.	A change of 5% in the volatility could decrease/increase the Company’s profit (loss) for the year ended December 31, 2021 by NT$283 million and NT$278 million, respectively.

b. Assets and liabilities not recorded at fair value but for which fair value is disclosed:

The fair value of bonds payable is estimated by the market price or using a valuation model. The model uses market-based observable inputs including share price, volatility, credit spread and risk-free interest rates. The fair value of long-term loans is determined using discounted cash flow model, based on the Company’s current incremental borrowing rates of similar loans.

The fair values of the Company’s short-term financial instruments including cash and cash equivalents, receivables, refundable deposits, other financial assets, short-term loans, payables and guarantee deposits approximate their carrying amount due to their maturities within one year.

As of December 31, 2020
		Fair value measurements during reporting period using
Items	Fair value	Level 1	Level 2	Level 3	Carrying amount
	NT$ (In Thousands)	NT$ (In Thousands)	NT$ (In Thousands)	NT$ (In Thousands)	NT$ (In Thousands)

Bonds payables (current portion included)	$	18,861,597	$	18,861,597	$	—	$	—	$	18,690,384
Long-term loans (current portion included)		33,066,106		—		33,066,106		—		33,066,106

As of December 31, 2021
		Fair value measurements during reporting period using
Items	Fair value	Level 1	Level 2	Level 3	Carrying amount
	NT$	NT$	NT$	NT$	NT$
	(In Thousands)	(In Thousands)	(In Thousands)	(In Thousands)	(In Thousands)

Bonds payables (current portion included)	$	41,947,014	$	31,442,469	$	10,504,545	$	—	$	40,536,658
Long-term loans (current portion included)		36,624,907		—		36,624,907		—		36,624,907

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Operating Segment Information

12 Months Ended

Dec. 31, 2021

Disclosure of operating segments [abstract]

Operating Segment Information

12. OPERATING SEGMENT INFORMATION

(1) The Company determined its operating segments based on business activities with discrete financial information regularly reported through the Company’s internal reporting protocols to the Company’s chief operating decision maker. The Company only has wafer fabrication operating segment as the single reporting segment. The primary operating activity of the wafer fabrication segment is the manufacture of chips to the design specifications of our customers by using our own proprietary processes and techniques. The Company maintains a diversified customer base across industries, including communication, consumer electronics, computer, memory and others, while continuing to focus on manufacturing for high growth, large volume applications, including networking, telecommunications, internet, multimedia, PCs and graphics. There was no material difference between the accounting policies of the operating segment and those described in Note 4. Please refer to the Company’s consolidated financial statements for the related segment revenue and operating results.

(2) Geographic non-current assets information 

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Taiwan	$	64,563,752	$	81,505,018
Singapore		11,621,141		10,610,974
China (includes Hong Kong)		59,643,273		48,667,135
Japan		11,591,851		10,010,255
USA		46,484		24,116
Europe		21,257		18,210
Others		1,126		2,489
Total	$	147,488,884	$	150,838,197

Non-current assets include property, plant and equipment, right-of-use assets, intangible assets, prepayment for equipment and other noncurrent assets.

(3) Major customers

Individual customers accounting for at least 10% of operating revenues for the years ended December 31, 2019, 2020 and 2021 were as follows:

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Customer A from wafer fabrication segment	$	17,576,293	$	20,380,814	$	21,935,208

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Capital Management

12 Months Ended

Dec. 31, 2021

Capital Management [Abstract]

Capital Management

13. CAPITAL MANAGEMENT

The primary objective of the Company’s capital management is to ensure that it maintains a strong credit rating and healthy capital ratios to support its business and maximize the shareholders’ value. The Company also ensures its ability to operate continuously to provide returns to shareholders and the interests of other related parties, while maintaining the optimal capital structure to reduce costs of capital.

To maintain or adjust the capital structure, the Company may adjust the dividend payment to shareholders, return capital to shareholders, issue new shares or dispose assets to redeem liabilities.

Similar to its peers, the Company monitors its capital based on debt to capital ratio. The ratio is calculated as the Company’s net debt divided by its total capital. The net debt is derived by taking the total liabilities on the consolidated balance sheets minus cash and cash equivalents. The total capital consists of total equity (including capital, additional paid-in capital, retained earnings, other components of equity and non-controlling interests) plus net debt.

The Company’s strategy, which is unchanged for the reporting periods, is to maintain a reasonable ratio in order to raise capital with reasonable cost. The debt to capital ratios as of December 31, 2020 and 2021 were as follows:

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Total liabilities	$	143,314,539		$	186,580,294
Less: Cash and cash equivalents		(94,048,036	)		(132,622,131	)
Net debt		49,266,503			53,958,163
Total equity		223,139,562			264,375,047
Total capital	$	272,406,065		$	318,333,210
Debt to capital ratios		18.09	%		16.95	%

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2021

Disclosure Of Summary Of Significant Accounting Policies [Abstract]

Statement of Compliance

(1) Statement of Compliance

The Company’s consolidated financial statements were prepared in accordance with IFRSs, including International Financial Reporting Standards, International Accounting Standards, IFRIC Interpretations and SIC Interpretations, as issued by IASB.

Basis of Preparation

(2) Basis of Preparation

The consolidated financial statements have been prepared on a historical cost basis, except for financial instruments measured at fair value.

General Description of Reporting Entity

(3) General Description of Reporting Entity

a. Principles of consolidation

Subsidiaries are fully consolidated from the date of acquisition (the date on which the Company obtains control), and continue to be consolidated until the date that such control ceases. The Company controls an entity when the Company is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of the subsidiaries are prepared for the same reporting period as the parent company, using consistent accounting policies. All intra-group balances, transactions, unrealized gains and losses and dividends resulting from intra-group transactions are eliminated in full.

A change in the ownership interest of a subsidiary, without a change of control, is accounted for as an equity transaction. Total comprehensive income of subsidiaries is attributed to the shareholders of the parent and to the non-controlling interests even if this results in the non-controlling interests having a deficit balance.

If the Company loses control over a subsidiary, the Company derecognizes the assets and liabilities of the subsidiary, as well as any non-controlling interests previously recorded by the Company. A gain or loss is recognized in profit or loss and is calculated as the difference between: (a) the aggregate of the fair value of consideration received and the fair value of any retained interest at the date when control is lost; and (b) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling interests. Any gain or loss previously recognized in the other comprehensive income would be reclassified to profit or loss or transferred directly to retained earnings if required by other IFRSs. The fair value of any investment retained in the former subsidiary at the date when control is lost is regarded as the cost on initial recognition of an investment.

b. The consolidated entities as of December 31, 2020 and 2021 were as follows:

			Percentage of ownership (%) as of December 31,
Investor	Subsidiary	Business nature	2020		2021
UMC	UMC GROUP (USA)	IC Sales		100.00		100.00
UMC	UNITED MICROELECTRONICS (EUROPE) B.V.	Marketing support activities		100.00		100.00
UMC	UMC CAPITAL CORP.	Investment holding		100.00		100.00
UMC	GREEN EARTH LIMITED (GE)	Investment holding		100.00		100.00
UMC	TLC CAPITAL CO., LTD. (TLC)	Venture capital		100.00		100.00
UMC	UMC INVESTMENT (SAMOA) LIMITED	Investment holding		100.00		100.00
UMC	FORTUNE VENTURE CAPITAL CORP. (FORTUNE)	Consulting and planning for venture capital		100.00		100.00
UMC	UMC KOREA CO., LTD.	Marketing support activities		100.00		100.00
UMC	OMNI GLOBAL LIMITED (OMNI)	Investment holding		100.00		100.00
UMC	SINO PARAGON LIMITED	Investment holding		100.00		100.00
UMC	BEST ELITE INTERNATIONAL LIMITED (BE)	Investment holding		100.00		100.00
UMC	UNITED SEMICONDUCTOR JAPAN CO., LTD.	Sales and manufacturing of integrated circuits		100.00		100.00
UMC and FORTUNE	WAVETEK MICROELECTRONICS CORPORATION (WAVETEK)	Sales and manufacturing of integrated circuits		81.40		80.37
TLC	SOARING CAPITAL CORP.	Investment holding		100.00		100.00

			Percentage of ownership (%) as of December 31,
Investor	Subsidiary	Business nature	2020		2021
SOARING CAPITAL CORP.	UNITRUTH ADVISOR (SHANGHAI) CO., LTD.	Investment holding and advisory		100.00		100.00
GE	UNITED MICROCHIP CORPORATION	Investment holding		100.00		100.00
FORTUNE	TERA ENERGY DEVELOPMENT CO., LTD. (TERA ENERGY)	Energy technical services		100.00		100.00
TERA ENERGY	EVERRICH ENERGY INVESTMENT (HK) LIMITED (EVERRICH-HK)	Investment holding		100.00		100.00
EVERRICH-HK	EVERRICH (SHANDONG) ENERGY CO., LTD.	Solar engineering integrated design services		100.00		100.00
OMNI	UNITED MICROTECHNOLOGY CORPORATION (CALIFORNIA)	Research and development		100.00		100.00
OMNI	ECP VITA PTE. LTD.	Insurance		100.00		100.00
OMNI	UMC TECHNOLOGY JAPAN CO., LTD.	Semiconductor manufacturing technology development and consulting services		100.00		—
WAVETEK	WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA)	Investment holding		100.00		100.00
WAVETEK-SAMOA	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		100.00		100.00
BE	INFOSHINE TECHNOLOGY LIMITED (INFOSHINE)	Investment holding		100.00		100.00
INFOSHINE	OAKWOOD ASSOCIATES LIMITED (OAKWOOD)	Investment holding		100.00		100.00
OAKWOOD	HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ)	Sales and manufacturing of integrated circuits		99.9985		99.9985
HJ	UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS)	Integrated circuits design services		100.00		100.00
UNITED MICROCHIP CORPORATION and HJ	UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM)	Sales and manufacturing of integrated circuits		67.76		69.95

Business Combinations and Goodwill

(4) Business Combinations and Goodwill

Business combinations are accounted for using the acquisition method. The consideration transferred, the identifiable assets acquired and liabilities assumed are measured at the acquisition date fair value. For the components of non-controlling interests in the acquiree that are present ownership interests and entitle their holders to a proportionate share of the entity’s net assets in the event of liquidation, the acquirer measures at either fair value or at the non-controlling interest’s proportionate share of the acquiree’s identifiable net assets. Acquisition-related costs are expensed as incurred and are classified under administrative expenses.

When the Company acquires a business, it assesses the assets acquired and liabilities assumed for appropriate classification and designation in accordance with the contractual terms, economic circumstances and pertinent conditions as at the acquisition date.

If the business combination is achieved in stages, the acquisition date fair value of the acquirer’s previously held equity interest in the acquiree is remeasured at fair value as at the acquisition date through profit or loss.

Any contingent consideration to be transferred by the acquirer will be recognized at fair value at the acquisition date. Subsequent changes to the fair value of the contingent consideration which is deemed to be an asset or liability, will be recognized in accordance with IFRS 9, either in profit or loss or other comprehensive income. If the contingent consideration is classified as equity, it should not be remeasured until it is finally settled within equity.

Goodwill is initially measured at cost, being the excess of the aggregate of the consideration transferred, the acquisition date fair value of the acquirer’s previously held equity interest in the acquiree and the amount recognized for non-controlling interest over the net identifiable assets acquired and liabilities assumed. If the fair value of the net assets acquired is in excess of the aggregate consideration transferred and non-controlling interests, the difference is recognized as a gain on bargain purchase.

After initial recognition, goodwill is measured at cost less any accumulated impairment losses. For the purpose of impairment testing, goodwill acquired in a business combination is, from the acquisition date, allocated to each cash-generating unit (CGU) that is expected to benefit from the combination, irrespective of whether other assets or liabilities of the acquiree are assigned to those units. Each unit or groups of units to which the goodwill is so allocated represents the lowest level within the Company at which the goodwill is monitored for internal management purposes and cannot be larger than an operating segment before aggregation.

Where goodwill forms part of a CGU and part of the operation within that unit is disposed, the goodwill associated with the operation disposed is included in the carrying amount of the operation. Goodwill disposed in this circumstance is measured based on the relative values of the operation disposed and the portion of the CGU retained.

Foreign Currency Transactions

(5) Foreign Currency Transactions

The Company’s consolidated financial statements are presented in New Taiwan Dollars (NTD), which is also the parent company’s functional currency. Each entity in the Company determines its own functional currency and items included in the financial statements of each entity are measured using that functional currency.

Transactions in foreign currencies are initially recorded by the Company’s entities at their respective functional currency rates prevailing at the transaction date. Monetary assets and liabilities denominated in foreign currencies are translated into functional currency at the closing rates of exchange at the reporting date. Non-monetary items measured at fair value in foreign currencies are translated using the exchange rates at the date when the fair value is determined. Non-monetary items that are measured at historical cost in foreign currencies are translated using the exchange rates as at the dates of the initial transactions.

All exchange differences arising on the settlement of monetary items or on translating monetary items are taken to profit or loss in the period in which they arise except for the following:

a. Exchange differences arising from foreign currency borrowings for an acquisition of a qualifying asset to the extent that they are regarded as an adjustment to interest costs are included in the borrowing costs that are eligible for capitalization.

b. Foreign currency derivatives within the scope of IFRS 9 are accounted for based on the accounting policy for financial instruments.

c. Exchange differences arising on a monetary item that is part of a reporting entity’s net investment in a foreign operation are recognized initially in other comprehensive income and reclassified from equity to profit or loss upon disposal of such investment.

When a gain or loss on a non-monetary item is recognized in other comprehensive income, any exchange component of that gain or loss is recognized in other comprehensive income. When a gain or loss on a non-monetary item is recognized in profit or loss, any exchange component of that gain or loss is recognized in profit or loss.

Translation of Foreign Currency Financial Statements

(6) Translation of Foreign Currency Financial Statements

The assets and liabilities of foreign operations are translated into NTD at the closing rate of exchange prevailing at the reporting date and their income and expenses are translated at an average exchange rate for the period. The exchange differences arising on the translation are recognized in other comprehensive income. On disposal of a foreign operation, the cumulative amount of the exchange differences relating to that foreign operation, recognized in other comprehensive income and accumulated in the separate component of equity, is reclassified from equity to profit or loss when the gain or loss on disposal is recognized.

On partial disposal of a subsidiary that includes a foreign operation that does not result in a loss of control, the proportionate share of the cumulative amount of the exchange differences recognized in other comprehensive income is re-attributed to the non-controlling interests in that foreign operation. On partial disposal of an associate or a joint venture that includes a foreign operation that does not result in a loss of significant influence or joint control, only the proportionate share of the cumulative amount of the exchange differences recognized in other comprehensive income is reclassified to profit or loss.

Any goodwill and any fair value adjustments to the carrying amounts of assets and liabilities arising from the acquisition of a foreign operation are treated as assets and liabilities of the foreign operation and expressed in its functional currency.

Convenience Translation into U.S. Dollars

(7) Convenience Translation into U.S. Dollars

Translations of amounts from NTD into U.S. dollars (USD) for the reader’s convenience were calculated at the rate of USD1.00 to NTD27.74 on December 30, 2021 released by Board of Governors of the Federal Reserve System. No representation is made that the NTD amounts could have been, or could be, converted into USD at this rate.

Current and Non-Current Distinction

(8) Current and Non-Current Distinction

An asset is classified as current when:

a. the Company expects to realize the asset, or intends to sell or consume it, in its normal operating cycle;

b. the Company holds the asset primarily for the purpose of trading;

c. the Company expects to realize the asset within twelve months after the reporting period; or

d. the asset is cash or a cash equivalent unless the asset is restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period.

All other assets are classified as non-current.

A liability is classified as current when:

a. the Company expects to settle the liability in normal operating cycle;

b. the Company holds the liability primarily for the purpose of trading;

c. the liability is due to be settled within twelve months after the reporting period; or

d. the Company does not have an unconditional right to defer settlement of the liability for at least twelve months after the reporting date. Terms of a liability that could, at the option of the counterparty, result in its settlement by the issue of equity instruments do not affect its classification.

All other liabilities are classified as non-current.

Cash Equivalents

(9) Cash Equivalents

Cash equivalents are short-term, highly liquid investments that are readily convertible to known amounts of cash and with maturity dates that do not present significant risks of changes in value resulting from changes in interest rates, including time deposits with original maturities of three months or less and repurchase agreements collateralized by government bonds and corporate bonds.

Financial Instruments

(10) Financial Instruments

Financial assets and financial liabilities are recognized when the Company becomes a party to the contractual provisions of the instrument. Purchase or sale of financial assets and liabilities are recognized using trade date accounting. All financial assets are recognized initially at fair value plus, in the case of investments not at fair value through profit or loss, directly attributable costs. Financial assets at fair value through profit or loss are initially recognized at fair value, and transaction costs are expensed in the statement of comprehensive income.

Financial Assets

a. Classification and subsequent measurement

The Company determines the classification of its financial assets at initial recognition. In accordance with IFRS 9, financial assets of the Company are classified as financial assets at fair value through profit or loss, financial assets at fair value through other comprehensive income, and financial assets measured at amortized cost.

i. Financial assets at fair value through profit or loss

Financial assets that are not measured at amortized cost or at fair value through other comprehensive income are recognized initially at fair value and subsequently measured at fair value with changes in fair value recognized in profit or loss.

ii. Financial assets at fair value through other comprehensive income

At initial recognition, the Company may make an irrevocable election to present in other comprehensive income subsequent changes in the fair value of an investment in an equity instrument that is not held for trading. When there is a disposal of such equity instrument, accumulated amounts presented in other comprehensive income are not subsequently transferred to profit or loss but are transferred directly to the retained earnings.

The debt instruments are measured at fair value through other comprehensive income if both of the following conditions are met:

(i) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and

(ii) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding.

Subsequent changes in the fair value of such financial assets at fair value through other comprehensive income are recognized in other comprehensive income. Before derecognition, impairment gains or losses, interest revenue and foreign exchange gains and losses are recognized in profit or loss. When the financial assets are derecognized the cumulative gain or loss previously recognized in other comprehensive income is reclassified from other comprehensive income to profit or loss as a reclassification adjustment.

iii. Financial assets measured at amortized cost

The financial assets are measured at amortized cost (including cash and cash equivalent, notes, accounts and other receivables and other financial assets) if both of the following conditions are met.

(i) the financial asset is held within a business model whose objective is to hold financial assets in order to collect contractual cash flows; and

(ii) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding.

Subsequent to initial recognition for financial assets measured at amortized cost, interest income, measured by the effective interest method amortization process, and impairment losses are recognized during circulation period. Gains and losses are recognized in profit or loss when the financial assets are derecognized.

b. Derecognition of financial assets

A financial asset is derecognized when:

i. the contractual rights to receive cash flows from the asset have expired;

ii. the Company has transferred assets and substantially all the risks and rewards of the asset have been transferred; or

iii. the Company has neither transferred nor retained substantially all the risks and rewards of the asset, but has transferred control of the asset.

Hedge Accounting

(11) Hedge Accounting

Cash flow hedges

The Company manages exposures arising from foreign currency exchange risk. With the adoption of IFRS 9, the Company designates a hedging relationship between the hedging instrument and the hedged item with the existence of an economic relationship and determines the hedge ratio to meet the hedge effectiveness. The Company designates certain hedging instruments to partially hedge the foreign currency exchange rate risks associated with certain highly probable forecast transactions. The separate component of equity associated with the hedged item is adjusted to the lower of the following (in absolute amounts):

a. the cumulative gain or loss on the hedging instrument from inception of the hedge; and

b. the cumulative change in fair value (present value) of the expected future cash flows on the hedged item from inception of the hedge.

The portion of the gain or loss on the hedging instrument that is determined to be an effective hedge is recognized in other comprehensive income, whereas the ineffective portion of the change in the fair value of the hedging instrument is recognized directly in profit or loss. If a hedge of a forecast transaction subsequently results in the recognition of a non-financial asset or a non-financial liability, the associated gains or losses that were recognized in other comprehensive income are included in the initial cost of the asset or liability.

The Company prospectively discontinues hedge accounting only when the hedging relationship ceases to meet the qualifying criteria; for instance when the hedging instrument expires or is sold, terminated or exercised.

Inventories

(12) Inventories

Inventories are accounted for on a perpetual basis. Raw materials are stated at actual purchase costs, while the work in process and finished goods are stated at standard costs and subsequently adjusted to weighted-average costs at the end of each month. The cost of work in progress and finished goods comprises raw materials, direct labor, other direct costs and related production overheads. Allocation of fixed production overheads to the costs of conversion is based on the normal capacity of the production facilities. Cost associated with underutilized capacity is expensed as incurred. Inventories are valued at the lower of cost and net realizable value item by item. Net realizable value is the estimated selling price in the ordinary course of business less the estimated costs of completion and the estimated costs necessary to make the sale.

Investments Accounted for Under the Equity Method

(13) Investments Accounted for Under the Equity Method

The Company’s investments in associates and joint ventures are accounted for using the equity method other than those that meet the criteria to be classified as non-current assets held for sale.

An associate is an entity over which the Company has significant influence and that is neither a subsidiary nor a joint venture. Significant influence is the power to participate in the financial and operating policy decisions of an entity, but is not control or joint control over those policies.

A joint venture is a type of joint arrangement whereby the Company that has joint control of the arrangement has rights to the net assets of the joint venture. Joint control is the contractually agreed sharing of control of an arrangement where no single party controls the arrangement on its own, which exists only when decisions about the relevant activities require unanimous consent of the parties sharing control.

Any difference between the acquisition cost and the Company’s share of the net fair value of the identifiable assets and liabilities of associates and joint ventures is accounted for as follows:

a. Any excess of the acquisition cost over the Company’s share of the net fair value of the identifiable assets and liabilities of an associate or a joint venture at the date of acquisition is recognized as goodwill and is included in the carrying amount of the investment. Amortization of goodwill is not permitted.

b. Any excess of the Company’s share of the net fair value of the identifiable assets and liabilities of an associate or a joint venture over the acquisition cost, after reassessing the fair value, is recognized as a gain in profit or loss on the acquisition date.

Under the equity method, the investments in associates and joint ventures are carried on the balance sheet at cost plus post acquisition changes in the Company’s share of profit or loss and other comprehensive income of associates and joint ventures. The Company’s share of changes in associates’ and joint ventures’ profit or loss and other comprehensive income are recognized directly in profit or loss and other comprehensive income, respectively. Distributions received from an associate or a joint venture reduce the carrying amount of the investment. Any unrealized gains and losses resulting from transactions between the Company and the associate or the joint venture are eliminated to the extent of the Company’s interest in the associate or the joint venture.

Financial statements of associates and joint ventures are prepared for the same reporting period as the Company. Where necessary, adjustments are made to bring the accounting policies in line with those of the Company.

Upon an associate’s issuance of new shares, if the Company takes up more shares than its original proportionate holding while maintaining its significant influence over that associate, such increase would be accounted for as an acquisition of an additional equity interest in the associate. Upon an associate’s issuance of new shares, if the Company does not take up proportionate shares resulting in decrease in its stockholding percentage while maintaining its significant influence over that associate, the Company treats the transaction as deemed disposal and reclassifies to profit or loss or other appropriate account(s) the proportion of the gain or loss previously recognized in other comprehensive income relating to that reduction in ownership interest.

The Company ceases to use the equity method upon loss of significant influence over an associate. Any difference between the carrying amount of the investment in an associate upon loss of significant influence and the fair value of the retained investment plus proceeds from disposal will be recognized in profit or loss. If an investment in an associate becomes an investment in a joint venture or an investment in a joint venture becomes an investment in an associate, the Company continues to apply the equity method and does not remeasure the retained interest.

The Company determines at each reporting date whether there is any objective evidence that the investments in associates and joint ventures are impaired. An impairment loss, being the difference between the recoverable amount of the associate or joint venture and its carrying amount, is recognized in profit or loss in the statement of comprehensive income and forms part of the carrying amount of the investments.

Property, Plant and Equipment

(14) Property, Plant and Equipment

Property, plant and equipment are stated at cost, net of accumulated depreciation and accumulated impairment losses, if any, and any borrowing costs incurred for long-term construction projects are capitalized if the recognition criteria are met. Significant renewals, improvements and major inspections meeting the recognition criteria are treated as capital expenditures, and the carrying amounts of those replaced parts are derecognized. Maintenance and repairs are recognized in expenses as incurred. Any gain or loss arising from derecognition of the assets is recognized in other operating income and expenses.

Depreciation is calculated on a straight-line basis over the estimated useful lives. A significant part of an item of property, plant and equipment which has a different useful life from the remainder of the item is depreciated separately.

The depreciation methods, useful lives and residual values for the assets are reviewed at each fiscal year end, and the changes from the previous estimation are recorded as changes in accounting estimates.

Except for land, which is not depreciated, the estimated useful lives of the assets are as follows:

Buildings	7-56 years
Machinery and equipment	6-7 years
Transportation equipment	6-7 years
Furniture and fixtures	3-7 years
Leasehold improvement	The shorter of lease terms or useful lives

Lease

(15) Lease

A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange of consideration, and to obtain substantially all economic benefits from use of the identified asset. The Company accounts for a lease contract as a single lease and separates the lease and non-lease components included in the contract.

The Company as a lessor

The Company recognizes lease payments from operating leases as rental income on a straight-line basis over the term of the lease.

The Company as a lessee

At the commencement date of a lease, a lessee is required to recognize right-of-use assets and lease liabilities, except for short-term leases and low-value asset leases.

a. At the commencement date, lease liabilities should be recognized and measured at the present value of the lease payments that have not been paid at that date, using the Company’s incremental borrowing rate. The payments comprise:

i. fixed payments less any lease incentives receivable;

ii. variable lease payments that depend on an index or rate;

iii. amounts expected to be payable by the Company under residual value guarantees;

iv. the exercise price of a purchase option if the Company is reasonably certain to exercise; and

v. payments for terminating the lease unless it is reasonably certain that early termination will not occur.

Lease liabilities are measured in subsequent periods using the effective interest method, and the interest expenses are recognized over the lease terms. In addition, the carrying amount of lease liabilities is remeasured if there is a modification which is not accounted as a separate lease, a change in the lease term, a change in the lease payments (e.g., changes to future payments resulting from a change in an index or rate used to determine such lease payments) or a change in the assessment of an option to purchase the underlying asset.

b. At the commencement date, the right-of-use assets should be measured at cost, which comprise of:

i. the amount of the initial measurement of the lease liabilities;

ii. any lease payments made at or before the commencement date; and

iii. any initial direct costs incurred.

Subsequent to initial recognition, the right-of-use assets are measured using cost model. Right-of-use assets measured under the cost model are depreciated from the commencement date to the earlier of the end of the useful life of the right-of-use assets or the end of the lease terms. Any remeasurement of the lease liabilities results in a corresponding adjustment of the right-of-use assets.

The Company presents right-of-use assets and lease liabilities on the balance sheets, and depreciation expenses and interest expenses are separately presented in the statements of comprehensive income. The Company recognizes the lease payments associated with short-term leases and low-value asset leases as expenses on a straight-line basis over the lease terms.

Intangible Assets

(16) Intangible Assets

Intangible assets acquired separately are measured on initial recognition at cost. The cost of intangible assets acquired in a business combination is its fair value as at the date of acquisition. Following initial recognition, intangible assets are carried at cost less any accumulated amortization and accumulated impairment losses, if any. Internally generated intangible assets which fail to meet the recognition criteria are not capitalized and the expenditures are reflected in profit or loss in the period incurred.

The useful lives of intangible assets are assessed as either finite or indefinite.

Intangible assets with finite useful lives are amortized over the useful lives and assessed for impairment whenever there is an indication that the intangible assets may be impaired. The amortization period and the amortization method for an intangible asset with a finite useful life are reviewed at least at the end of each fiscal year. Changes in the expected useful life or the expected pattern of consumption of future economic benefits embodied in the asset is accounted for by changing the amortization period or method, as appropriate, and is treated as changes in accounting estimates.

Intangible assets with indefinite useful lives are not amortized, but are tested for impairment annually, either individually or at the CGU level. The assessment of indefinite useful life is reviewed annually to determine whether the indefinite useful life continues to be supportable. If not, the change in useful life from indefinite to finite is made on a prospective basis.

Gains or losses arising from derecognition of an intangible asset are recognized in other operating income and expenses.

Accounting policies of the Company’s intangible assets are summarized as follows:

a. Goodwill arising from business combinations is not amortized, and is tested for impairment annually or more frequently if events or changes in circumstances suggest that the carrying amount may not be recoverable. If an event occurs or circumstances change which indicates that the goodwill is impaired, an impairment loss is recognized. Goodwill impairment losses cannot be reversed once recognized.

b. Software is amortized over the contract term or estimated useful life (3-6 years) on a straight-line basis.

c. Patent and technology license fee: Upon signing of contract and obtaining the right to intellectual property, any portion attributable to non-cancellable and mutually agreed future fixed license fees for patent and technology is discounted and recognized as an intangible asset and related liability. The cost of the intangible asset is not revalued once determined on initial recognition, and is amortized over the useful life (5-10 years) on a straight-line basis. Interest expenses from the related liability are recognized and calculated based on the effective interest method. Based on the timing of payments, the liability is classified as current and non-current.

d. Others are mainly the intellectual property license fees, amortized over the shorter of the contract term or estimated useful life (3 years) of the related technology on a straight-line basis.

Impairment of Non-Financial Assets

(17) Impairment of Non-Financial Assets

The Company assesses at each reporting date whether there is an indication that an asset in the scope of IAS 36 “Impairment of Assets” may be impaired. If any indication exists, the Company completes impairment testing for the CGU to which the individual assets belong. Where the carrying amount of an asset or CGU exceeds its recoverable amount, the asset is considered impaired and is written down to its recoverable amount. The recoverable amount of an individual asset or a CGU is the higher of its fair value less costs of disposal and its value in use. If circumstances indicate that previously recognized impairment losses may no longer exist or may have decreased at each reporting date, the Company re-assesses the asset’s or CGU’s recoverable amount. A previously recognized impairment loss is reversed only if there has been an increase in the estimated service potential of an asset which in turn increases the recoverable amount since the last impairment loss was recognized. The reversal is limited so that the carrying amount of the asset does not exceed its recoverable amount, nor exceed the carrying amount that would have been determined, net of depreciation or amortization, had no impairment loss been recognized for the asset in prior years.

A CGU, or group of CGUs, to which goodwill has been allocated is tested for impairment annually at the same time every year, irrespective of whether there is any indication of impairment. Where the carrying amount of a CGU (including the carrying amount of goodwill) exceeds its recoverable amount, the CGU is considered impaired. If an impairment loss is to be recognized, it is first allocated to reduce the carrying amount of any goodwill allocated to the CGU (group of units), then to the other assets of the unit (group of units) pro rata on the basis of the carrying amount of each asset in the unit (group of units). Impairment losses relating to goodwill cannot be reversed in future periods.

The recognition or reversal of impairment losses is classified as other operating income and expenses.

Bonds

(18) Bonds

Convertible bonds

UMC evaluates the terms of the convertible bonds issued to determine whether it contains both a liability and an equity component. Furthermore, UMC assesses if the economic characteristics and risks of the put and call options embedded in the convertible bonds are closely related to the economic characteristics and risk of the host contract before separating the equity element.

For the liability component excluding the derivatives, its fair value is determined based on the effective interest rate applied at that time by the market to instruments of comparable credit status. The liability component is classified as a financial liability measured at amortized cost using the effective interest method before the instrument is converted or settled. For the embedded derivative that is not closely related to the host contract, it is classified as a liability component and subsequently measured at fair value through profit or loss unless it qualifies as an equity component. The equity component is recognized initially at the difference between the fair value of the compound financial instrument as a whole and the fair value of the liability component. Its carrying amount is not remeasured in the subsequent accounting periods. If the convertible bond issued does not have an equity component, it is accounted for as a hybrid instrument in accordance with the requirements under IFRS 9.

If the convertible bondholders exercise their conversion right before maturity, UMC shall adjust the carrying amount of the liability component. The adjusted carrying amount of the liability component at conversion and the carrying amount of equity component are credited to common stock and additional paid-in capital-premiums. No gain or loss is recognized upon bond conversion.

In addition, the liability component of convertible bonds is classified as a current liability if within 12 months the bondholders may exercise the put right. After the put right expires, the liability component of the convertible bonds should be reclassified as a non-current liability if it meets the definition of a non-current liability in all other respects.

Exchangeable bonds

In accordance with IFRS 9, if the economic characteristics and risks of the embedded derivative are not closely related to the economic characteristics and risks of the host, the derivative financial instruments embedded in exchangeable bonds would be separated from the host and accounted for as financial assets or liabilities at fair value through profit or loss.

UMC has issued exchangeable bonds where the bondholders may exchange the bonds into ordinary shares of certain public entities which UMC holds as financial assets (“reference shares”). When exchangeable bondholders exercise their right to exchange their bonds for reference shares, the carrying amount of the bonds and the related assets or liabilities accounts will be derecognized, and the difference will be recognized in profit or loss.

Both the host and embedded derivative financial instrument in exchangeable bonds are classified as current liabilities as the bondholders have the right to demand settlement by exercising the exchange option of the bonds within 12 months.

Post-Employment Benefits

(19) Post-Employment Benefits

Under defined contribution pension plans, the contribution payable to the plan in exchange for the service rendered by an employee during a period shall be recognized as an expense. The contribution payable, after deducting any amount already paid, is recognized as a liability.

Under defined benefit pension plans, the net defined benefit liability (asset) shall be recognized as the amount of the present value of the defined benefit obligation, deducting the fair value of any plan assets and adjusting for any effect of the asset ceiling. Service cost and net interest on the net defined benefit liability (asset) are recognized as expenses in the period of service. Remeasurement of the net defined benefit liability (asset), which comprises actuarial gains and losses, the return on plan assets and any change in the effect of the asset ceiling, excluding any amounts included in net interest, is recognized in other comprehensive income in the period in which they occur. Remeasurement recognized in other comprehensive income is reflected immediately in retained earnings and shall not be reclassified to profit or loss in a subsequent period.

Government Grants

(20) Government Grants

In accordance with IAS 20 “Accounting for Government Grants and Disclosure of Government Assistance”, the Company recognizes the government grants when there is reasonable assurance that such grants will be received and the conditions attaching to them will be complied with.

An asset related government grant is recorded as deferred income and recognized in profit or loss on a straight-line basis over the useful lives of the assets. An expense related government grant is recognized in profit or loss on a systematic basis over the periods in which the Company recognizes as expenses the related costs for which the grant is intended to compensate. A government grant that compensates for expenses or losses already incurred or for the purpose of giving immediate financial support to the Company with no future related costs is recognized in profit or loss when it becomes receivable.

Treasury Stock

(21) Treasury Stock

UMC’s own equity instruments repurchased (treasury stocks) are recognized at repurchase cost and deducted from equity. No gain or loss shall be recognized in profit or loss on the purchase, sale, issue or cancellation of UMC’s own equity instruments. Any difference between the carrying amount and the consideration is recognized in equity.

Share-Based Payment Transactions

(22) Share-Based Payment Transactions

Equity-settled share-based payment transactions

The compensation cost of equity-settled transactions between the Company and its employees is measured at the fair value of the equity instruments on the grant date, and is recognized as expense, together with a corresponding increase in equity, over the vesting period. When issuing restricted stocks for employees, the unvested restricted stocks issued on the grant date for employees are recognized in unearned employee compensation as a transitional contra equity account and such account shall be amortized as compensation expense over the vesting period. The cumulative expense recognized for equity-settled transactions at each reporting date until the vesting date reflects the extent to which the vesting period has passed and the Company’s best estimate of the quantity of equity instruments that will ultimately vest. The movement in cumulative cost recognized at the beginning and end of the period is recognized through profit or loss for the period.

No expense is recognized for awards that do not ultimately vest, except for equity-settled transactions where vesting is conditional upon a market or non-vesting condition. The Company shall recognize the services received in expense irrespective of whether or not the market or non-vesting condition is satisfied, provided that all other performance and/or service conditions are satisfied.

Where the terms of an equity-settled transaction award are modified, the minimum expense recognized is the expense as if the terms had not been modified, if the original terms of the award are met. An additional expense is recognized for any modification that increases the total fair value of the share-based payment transaction, or is otherwise beneficial to the employee as measured at the date of modification.

Where an equity-settled award is cancelled, it is treated as if it fully vests on the date of cancellation, and any expense not yet recognized for the award is recognized immediately. This includes any award where non-vesting conditions within the control of either the entity or the employee are not met. However, if a new award substitutes for the cancelled award and is designated as a replacement award on the date that it is granted, the cancelled and new awards are treated as if they were a modification of the original award.

Cash-settled share-based payment transactions

The compensation cost of cash-settled share-based payment transactions between the Company and its employees is measured at the fair value of the liability incurred and recognized as expense with corresponding liability over the vesting period. The fair value of the liability is remeasured at the end of each reporting period and at the settlement date with the movement in fair value recognized through profit or loss for the period until the liability is settled.

Revenue Recognition

(23) Revenue Recognition

Revenue from Contracts with Customers

The Company recognizes revenue from contracts with customers by applying the following steps of IFRS 15 “Revenue from Contracts with Customers”:

a. identify the contract with a customer;

b. identify the performance obligations in the contract;

c. determine the transaction price;

d. allocate the transaction price to the performance obligations in the contract; and

e. recognize revenue when (or as) the entity satisfies its performance obligations.

Revenues on the Company’s contracts with customers for the sales of wafers and joint technology development are recognized as the Company satisfies its performance obligations to customers upon transfer of control of promised goods and services. The Company recognizes revenue at transaction price that are determined using contractual prices reduced by sales returns and allowances which the Company estimates based on historical experience having determined that a significant reversal in the amount of cumulative revenue recognized are not probable to occur. The Company recognizes refund liabilities for estimated sales return and allowances based on the customer complaints, historical experience, and other known factors.

The Company recognizes accounts receivable when the Company transfers control of the goods or services to customers and has a right to an amount of consideration that is unconditional. Such accounts receivable are short term and do not contain a significant financing component. For certain contracts that do not provide the Company unconditional rights to the consideration, and the transfer of control of the goods or services has been satisfied, the Company recognizes contract assets and revenues.

Consideration received from customers prior to the Company having satisfied its performance obligations are accounted for as contract liabilities which are transferred to revenue after the performance obligations are satisfied. The Company recognizes costs to fulfill a contract when the costs relate directly to the contract, generate or enhance resources to be used to satisfy performance obligations in the future, and are expected to be recovered. The costs and revenues are recognized when the Company satisfies its performance obligations to customers upon transfer of control of promised goods and services.

Interest income

For financial assets measured at amortized cost and financial assets at fair value through other comprehensive income, interest income is recorded using the effective interest method and recognized in profit or loss.

Dividends

Revenue is recognized when the Company’s right to receive the dividends is established, which is generally when shareholders approve the dividend.

Income Tax

(24) Income Tax

Income tax expense (benefit) is the aggregate amount of current income tax and deferred income tax included in the determination of profit or loss for the period.

Current income tax

Current income tax assets and liabilities for the current period and prior periods are measured using the tax rates and tax laws that have been enacted or substantively enacted by the end of the reporting period. Current income tax relating to items recognized directly in other comprehensive income or equity is recognized in other comprehensive income or equity rather than profit or loss.

Undistributed earnings, calculated based on Business Entity Accounting Act are subject to a tax in accordance with the Income Tax Law of the R.O.C. Accordingly, the undistributed tax impact is provided in the period the income is earned, assuming that no earnings are distributed. Any reduction in the liability will be recognized when the income is distributed upon the shareholders’ approval in the subsequent year. Tax on undistributed earnings may be offset by the Company’s available tax credits carried forward, where applicable. As such, the incremental tax accrued on undistributed earnings may be offset by a corresponding reduction in deferred income tax assets, where applicable.

Deferred income tax

Deferred income tax is determined using the liability method on temporary differences between the tax bases of assets and liabilities and their carrying amounts in financial statements at the reporting date.

Deferred tax liabilities are recognized for all taxable temporary differences, except:

a. When the deferred tax liability arises from the initial recognition of goodwill or of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss;

b. In respect of taxable temporary differences associated with investments in subsidiaries, associates and joint ventures, when the timing of the reversal of the temporary differences can be controlled and it is probable that the temporary differences will not reverse in the foreseeable future.

Deferred tax assets are recognized for all deductible temporary differences, the carryforward of unused tax losses and unused tax credits, to the extent that it is probable that future taxable profit will be available against which the deductible temporary differences and the carryforward of unused tax losses and unused tax credits can be utilized, except:

a. Where the deferred tax asset relating to the deductible temporary difference arises from the initial recognition of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss;

b. In respect of deductible temporary differences associated with investments in subsidiaries, associates and joint ventures, deferred tax assets are recognized only to the extent that it is probable that the temporary differences will reverse in the foreseeable future and taxable profit will be available against which the temporary differences can be utilized.

Deferred tax assets and liabilities are measured at the tax rates that are expected to apply in the year when the asset is realized or the liability is settled, based on tax rates and tax laws that have been enacted or substantively enacted at the reporting date. The measurement of deferred tax assets and liabilities reflects the tax consequences that would follow the manner in which the Company expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred tax relating to items recognized outside profit or loss is not recognized in profit or loss but rather in other comprehensive income or directly in equity. Deferred tax assets are reassessed and recognized at each reporting date. Unrecognized deferred tax assets are reassessed at each reporting date and are recognized to the extent that it has become probable that future taxable profits will allow the deferred tax assets to be recovered.

Deferred tax assets and liabilities offset each other, if a legally enforceable right exists to set off current income tax assets against current income tax liabilities, and the deferred taxes relate to the same taxable entity and the same taxation authority.

Tax benefits acquired as part of a business combination, but not satisfying the criteria for separate recognition at the acquisition date, might be realized and recognized subsequently as follows:

a. Acquired deferred tax benefits recognized within the measurement period that result from new information about facts and circumstances that existed at the acquisition date shall be applied to reduce the carrying amount of any goodwill related to that acquisition. If the carrying amount of that goodwill is nil, any remaining deferred tax benefits shall be recognized in profit or loss;

b. All other acquired deferred tax benefits realized shall be recognized in profit or loss, other comprehensive income or equity.

The Company has considered whether it is probable that a taxation authority will accept the uncertain tax treatments used in its income tax filings. If the Company concludes that it is probable that the taxation authority will accept an uncertain tax treatment, the Company determines the taxable profit, tax bases, unused tax losses, unused tax credits or tax rates consistently with the tax treatments used or planned to be used in its income tax filings. If it is not probable that the taxation authority will accept an uncertain tax treatment, the Company makes estimates using either the most likely amount or the expected value of the tax treatment, depending on which method the Company expects to better predict the resolution of the uncertainty. The Company reassesses a judgement or estimate if the facts and circumstance change.

Earnings per Share

(25) Earnings per Share

Earnings per share is computed according to IAS 33 “Earnings per Share”. Basic earnings per share is computed by dividing net income by the weighted-average number of ordinary shares outstanding during the current reporting period. Diluted earnings per share is computed by taking basic earnings per share into consideration plus additional ordinary shares that would have been outstanding if the dilutive share equivalents had been issued. Net income is also adjusted for interest and other income or expenses derived from any underlying dilutive share equivalents. The weighted-average of outstanding shares is adjusted retroactively for stock dividends and employee stock compensation issues.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Summary Of Significant Accounting Policies [Abstract]

Consolidated Entities

b. The consolidated entities as of December 31, 2020 and 2021 were as follows:

			Percentage of ownership (%) as of December 31,
Investor	Subsidiary	Business nature	2020		2021
UMC	UMC GROUP (USA)	IC Sales		100.00		100.00
UMC	UNITED MICROELECTRONICS (EUROPE) B.V.	Marketing support activities		100.00		100.00
UMC	UMC CAPITAL CORP.	Investment holding		100.00		100.00
UMC	GREEN EARTH LIMITED (GE)	Investment holding		100.00		100.00
UMC	TLC CAPITAL CO., LTD. (TLC)	Venture capital		100.00		100.00
UMC	UMC INVESTMENT (SAMOA) LIMITED	Investment holding		100.00		100.00
UMC	FORTUNE VENTURE CAPITAL CORP. (FORTUNE)	Consulting and planning for venture capital		100.00		100.00
UMC	UMC KOREA CO., LTD.	Marketing support activities		100.00		100.00
UMC	OMNI GLOBAL LIMITED (OMNI)	Investment holding		100.00		100.00
UMC	SINO PARAGON LIMITED	Investment holding		100.00		100.00
UMC	BEST ELITE INTERNATIONAL LIMITED (BE)	Investment holding		100.00		100.00
UMC	UNITED SEMICONDUCTOR JAPAN CO., LTD.	Sales and manufacturing of integrated circuits		100.00		100.00
UMC and FORTUNE	WAVETEK MICROELECTRONICS CORPORATION (WAVETEK)	Sales and manufacturing of integrated circuits		81.40		80.37
TLC	SOARING CAPITAL CORP.	Investment holding		100.00		100.00

			Percentage of ownership (%) as of December 31,
Investor	Subsidiary	Business nature	2020		2021
SOARING CAPITAL CORP.	UNITRUTH ADVISOR (SHANGHAI) CO., LTD.	Investment holding and advisory		100.00		100.00
GE	UNITED MICROCHIP CORPORATION	Investment holding		100.00		100.00
FORTUNE	TERA ENERGY DEVELOPMENT CO., LTD. (TERA ENERGY)	Energy technical services		100.00		100.00
TERA ENERGY	EVERRICH ENERGY INVESTMENT (HK) LIMITED (EVERRICH-HK)	Investment holding		100.00		100.00
EVERRICH-HK	EVERRICH (SHANDONG) ENERGY CO., LTD.	Solar engineering integrated design services		100.00		100.00
OMNI	UNITED MICROTECHNOLOGY CORPORATION (CALIFORNIA)	Research and development		100.00		100.00
OMNI	ECP VITA PTE. LTD.	Insurance		100.00		100.00
OMNI	UMC TECHNOLOGY JAPAN CO., LTD.	Semiconductor manufacturing technology development and consulting services		100.00		—
WAVETEK	WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA)	Investment holding		100.00		100.00
WAVETEK-SAMOA	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		100.00		100.00
BE	INFOSHINE TECHNOLOGY LIMITED (INFOSHINE)	Investment holding		100.00		100.00
INFOSHINE	OAKWOOD ASSOCIATES LIMITED (OAKWOOD)	Investment holding		100.00		100.00
OAKWOOD	HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ)	Sales and manufacturing of integrated circuits		99.9985		99.9985
HJ	UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS)	Integrated circuits design services		100.00		100.00
UNITED MICROCHIP CORPORATION and HJ	UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM)	Sales and manufacturing of integrated circuits		67.76		69.95

Estimated Useful Lives of Property, Plant and Equipment

Except for land, which is not depreciated, the estimated useful lives of the assets are as follows:

Buildings	7-56 years
Machinery and equipment	6-7 years
Transportation equipment	6-7 years
Furniture and fixtures	3-7 years
Leasehold improvement	The shorter of lease terms or useful lives

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Contents of Significant Accounts (Tables)

12 Months Ended

Dec. 31, 2021

Contents Of Significant Accounts [Line Items]

Cash and Cash Equivalents

(1) Cash and Cash Equivalents

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Cash on hand and petty cash	$	5,765	$	5,684
Checking and savings accounts		20,163,007		33,738,883
Time deposits		66,939,601		88,876,572
Repurchase agreements collateralized by government bonds and corporate notes		6,939,663		10,000,992
Total	$	94,048,036	$	132,622,131

Summary of Fair Value of Each Investment in Equity Instrument

The fair value of each investment in equity instrument to be measured at fair value through other comprehensive income is as follows:

 

		As of December 31,
Type of securities	Name of securities	2020		2021
		NT$		NT$
		(In Thousands)		(In Thousands)
Common stock	SILICON INTEGRATED SYSTEMS CORP.		2,039,645		3,407,886
Common stock	UNIMICRON HOLDING LIMITED		722,122		1,461,098
Common stock	ITE TECH. INC.		950,674		1,514,658
Common stock	CHIPBOND TECHNOLOGY CORPORATION		—		3,546,027
Common stock	NOVATEK MICROELECTRONICS CORP.		6,068,053		8,863,632
Common stock	SHIN-ETSU HANDOTAI TAIWAN CO., LTD.		575,505		890,505
Preferred stock	MTIC HOLDINGS PTE. LTD.		170,145		151,859

Summary of Income Recognized in Profit or Loss from Equity Instruments Designated as Fair Value Through Other Comprehensive Income

b. Dividend income recognized in profit or loss from equity instruments designated as fair value through other comprehensive income are listed below:

	For the years
	ended December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Held at end of period	$	286,795	$	465,679
Derecognized during the period		—		—
Total	$	286,795	$	465,679

Summary of Disposed and Derecognized Certain Investments Designated as Fair Value Through Other Comprehensive Income

c. In consideration of the Company’s investment strategy, the Company disposed and derecognized certain investments designated as fair value through other comprehensive income. Details on derecognition of such investments are listed below:

	For the years
	ended December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Fair value on the date of disposal	$	9,012,450	$	—
Cumulative gains (losses) reclassified to retained earnings due to derecognition	$	1,825,365	$	—

Aging Analysis of Accounts Receivables

Aging analysis of accounts receivable:

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Neither past due	$	23,801,905	$	30,758,397
Past due:
≤ 30 days		2,730,865		3,294,617
31 to 60 days		95,398		138,854
61 to 90 days		13,258		8,026
91 to 120 days		23,774		43,413
≥ 121 days		635,239		575,293
Subtotal		3,498,534		4,060,203
Total	$	27,300,439	$	34,818,600

Movement of Loss Allowance

Movement of loss allowance for accounts receivable:

	For the years ended December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Beginning balance	$	621,410		$	206,084
Net reversal for the period		(415,326	)		(11,593	)
Ending balance	$	206,084		$	194,491

Inventories, Net

(5) Inventories, Net

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Raw materials	$	5,507,002	$	3,371,520
Supplies and spare parts		4,290,672		5,106,770
Work in process		11,872,971		14,043,143
Finished goods		881,841		489,750
Total	$	22,552,486	$	23,011,183

Details of Investments Accounted for Under the Equity Method

(6) Investments Accounted for Under the Equity Method

a. Details of investments accounted for under the equity method are as follows:

	As of December 31,
	2020				2021
Investee companies	Amount		Percentage of ownership or voting rights		Amount		Percentage of ownership or voting rights
	NT$				NT$
	(In Thousands)				(In Thousands)
Listed companies
FARADAY TECHNOLOGY CORP. (FARADAY) (Note A)	$	1,583,971		13.78	$	1,767,821		13.78
UNIMICRON TECHNOLOGY CORP. (UNIMICRON) (Note B)		9,072,632		13.36		10,337,813		13.30
Unlisted companies
MTIC HOLDINGS PTE. LTD. (Note C)		26,966		45.44		—		45.44
PURIUMFIL INC.		6,206		44.45		7,253		44.45
UNITECH CAPITAL INC.		823,185		42.00		976,559		42.00
TRIKNIGHT CAPITAL CORPORATION		2,481,874		40.00		4,044,867		40.00
HSUN CHIEH CAPITAL CORP.		195,675		40.00		229,598		40.00
HSUN CHIEH INVESTMENT CO., LTD.		2,312,698		36.49		3,437,053		36.49
YANN YUAN INVESTMENT CO., LTD.		3,554,979		30.87		7,013,118		28.22
UNITED LED CORPORATION HONG KONG LIMITED		96,026		25.14		98,954		25.14
VSENSE CO., LTD. (Note C)		941		23.98		—		23.98
TRANSLINK CAPITAL PARTNERS I, L.P. (Note D)		174,985		10.38		225,342		10.38
Total	$	20,330,138			$	28,138,378

Note A: Beginning from June 2015, the Company accounts for its investment in FARADAY as an associate given the fact that the Company obtained the ability to exercise significant influence over FARADAY through representation on its Board of Directors.

Note B: Beginning from June 2020, the Company accounts for its investment in UNIMICRON as an associate given the fact that the Company obtained the ability to exercise significant influence over UNIMICRON through representation on its Board of Directors. UNIMICRON was previously measured at fair value through other comprehensive income and reclassified as investments accounted for under the equity method. Cumulative fair value changes that was previously recognized in other comprehensive income up to reclassification date was reclassified to retained earnings in the current period.

Note C: When the Company’s share of losses of an associate equals or exceeds its interest in that associate, the Company discontinues recognizing its share of further losses. Additional losses and liabilities are recognized only to the extent that the Company has incurred legal or constructive obligations or made payments on behalf of that associate.

Note D: The Company follows international accounting practices in equity accounting for limited partnerships and uses the equity method to account for these investees.

Other current assets

(7) Other current assets

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Time deposits with original maturities of over three months to a year	$	14,305,779	$	28,834,684
Others		2,945,390		2,988,182
Total	$	17,251,169	$	31,822,866

Property, Plant and Equipment

(8) Property, Plant and Equipment

2020

a. Assets Used by the Company:

Cost:

	Land			Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection			Total
	NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2020	$	1,692,123		$	38,437,588		$	865,547,572		$	65,909		$	6,842,124		$	65,883		$	5,583,516		$	918,234,715
Additions		—			—			—			—			—			—			26,420,747			26,420,747
Disposals		—			(1,316,833	)		(5,305,744	)		(10,856	)		(169,716	)		—			(12,938	)		(6,816,087	)
Transfers and reclassifications		—			109,586			17,142,065			—			246,622			62			(15,528,464	)		1,969,871
Exchange effect		(1,510	)		27,169			(5,814,568	)		(155	)		(10,252	)		(2,171	)		66,435			(5,735,052	)
As of December 31, 2020	$	1,690,613		$	37,257,510		$	871,569,325		$	54,898		$	6,908,778		$	63,774		$	16,529,296		$	934,074,194

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection		Total
	NT$		NT$			NT$			NT$			NT$			NT$			NT$		NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)
As of January 1, 2020	$	—	$	18,950,520		$	745,722,965		$	47,794		$	5,383,434		$	46,147		$	—	$	770,150,860
Depreciation		—		1,688,455			43,089,767			5,334			513,055			7,894			—		45,304,505
Disposals		—		(788,342	)		(5,301,373	)		(10,412	)		(169,680	)		—			—		(6,269,807	)
Transfers and reclassifications		—		—			—			—			1,082			(1,924	)		—		(842	)
Exchange effect		—		655			(5,824,014	)		16			(12,552	)		(2,154	)		—		(5,838,049	)
As of December 31, 2020	$	—	$	19,851,288		$	777,687,345		$	42,732		$	5,715,339		$	49,963		$	—	$	803,346,667
Net carrying amount:
As of December 31, 2020	$	1,690,613	$	17,406,222		$	93,881,980		$	12,166		$	1,193,439		$	13,811		$	16,529,296	$	130,727,527

b. Assets Subject to Operating Leases:

Cost:

	Land			Buildings			Machinery and equipment		Furniture and fixtures		Total
	NT$			NT$			NT$		NT$		NT$
	(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)		(In Thousands)
As of January 1, 2020	$	459,635		$	2,637,271		$	125,413	$	1,315,180	$	4,537,499
Disposals		—			(179,132	)		—		—		(179,132	)
Exchange effect		(13	)		(6,828	)		—		453		(6,388	)
As of December 31, 2020	$	459,622		$	2,451,311		$	125,413	$	1,315,633	$	4,351,979

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment		Furniture and fixtures			Total
	NT$		NT$			NT$		NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)		(In Thousands)			(In Thousands)
As of January 1, 2020	$	—	$	1,019,036		$	125,413	$	1,102,809		$	2,247,258
Depreciation		—		100,454			—		69,425			169,879
Disposals		—		(107,240	)		—		—			(107,240	)
Exchange effect		—		(4,705	)		—		(349	)		(5,054	)
As of December 31, 2020	$	—	$	1,007,545		$	125,413	$	1,171,885		$	2,304,843
Net carrying amount:
As of December 31, 2020	$	459,622	$	1,443,766		$	—	$	143,748		$	2,047,136

2021

a. Assets Used by the Company:

Cost:

	Land			Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection			Total
	NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	1,690,613		$	37,257,510		$	871,569,325		$	54,898		$	6,908,778		$	63,774		$	16,529,296		$	934,074,194
Additions		—			—			—			—			—			—			38,284,083			38,284,083
Disposals		—			(20,455	)		(3,587,695	)		(791	)		(5,010	)		—			(22,822	)		(3,636,773	)
Transfers and reclassifications		(96,439	)		114,081			35,718,256			2,158			433,504			204			(31,692,267	)		4,479,497
Exchange effect		(102,831	)		(523,656	)		(5,893,187	)		(306	)		(32,098	)		(2,696	)		(242,257	)		(6,797,031	)
As of December 31, 2021	$	1,491,343		$	36,827,480		$	897,806,699		$	55,959		$	7,305,174		$	61,282		$	22,856,033		$	966,403,970

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment			Transportation equipment			Furniture and fixtures			Leasehold improvement			Construction in progress and equipment awaiting inspection		Total
	NT$		NT$			NT$			NT$			NT$			NT$			NT$		NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)
As of January 1, 2021	$	—	$	19,851,288		$	777,687,345		$	42,732		$	5,715,339		$	49,963		$	—	$	803,346,667
Depreciation		—		1,474,241			41,329,061			5,310			531,085			7,247			—		43,346,944
Disposals		—		(20,455	)		(3,580,477	)		(791	)		(5,003	)		—			—		(3,606,726	)
Transfers and reclassifications		—		1,645			125,413			—			—			—			—		127,058
Exchange effect		—		(121,750	)		(4,656,461	)		(143	)		(19,038	)		(2,085	)		—		(4,799,477	)
As of December 31, 2021	$	—	$	21,184,969		$	810,904,881		$	47,108		$	6,222,383		$	55,125		$	—	$	838,414,466
Net carrying amount:
As of December 31, 2021	$	1,491,343	$	15,642,511		$	86,901,818		$	8,851		$	1,082,791		$	6,157		$	22,856,033	$	127,989,504

b. Assets Subject to Operating Leases:

Cost:

	Land			Buildings			Machinery and equipment			Furniture and fixtures			Total
	NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	459,622		$	2,451,311		$	125,413		$	1,315,633		$	4,351,979
Transfers and reclassifications		96,439			(18,542	)		(125,413	)		—			(47,516	)
Exchange effect		(7,051	)		(10,380	)		—			(2,930	)		(20,361	)
As of December 31, 2021	$	549,010		$	2,422,389		$	—		$	1,312,703		$	4,284,102

Accumulated Depreciation and Impairment:

	Land		Buildings			Machinery and equipment			Furniture and fixtures			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	—	$	1,007,545		$	125,413		$	1,171,885		$	2,304,843
Depreciation		—		94,130			—			67,347			161,477
Transfers and reclassifications		—		(1,645	)		(125,413	)		—			(127,058	)
Exchange effect		—		(4,917	)		—			(2,442	)		(7,359	)
As of December 31, 2021	$	—	$	1,095,113		$	—		$	1,236,790		$	2,331,903
Net carrying amount:
As of December 31, 2021	$	549,010	$	1,327,276		$	—		$	75,913		$	1,952,199

Disclosure Of Detailed Information About Lease Right Of Use Assets Explanatory

a. The Company as a lessee

(a) Right-of-use Assets

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Land (including land use right)	$	5,146,342	$	4,877,702
Buildings		352,119		284,011
Machinery and equipment		2,227,035		1,940,084
Transportation equipment		12,252		18,704
Other equipment		10,294		6,344
Net	$	7,748,042	$	7,126,845

	For the years ended December 31,
	2020		2021
	NT$		NT$
Depreciation	(In Thousands)		(In Thousands)
Land (including land use right)	$	333,402	$	325,268
Buildings		120,111		121,373
Machinery and equipment		223,120		210,188
Transportation equipment		8,145		9,858
Other equipment		4,531		4,524
Total	$	689,309	$	671,211

i. For the years ended December 31, 2020 and 2021, the Company’s addition to right-of-use assets amounted to NT$567 million and NT$207 million, respectively.

ii. Please refer to Note 8 for right-of-use assets pledged as collateral.

(b) Lease Liabilities

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Current	$	550,147	$	557,873
Non-current		5,026,717		4,510,881
Total	$	5,576,864	$	5,068,754

Please refer to Note 6(23) for the interest expenses on the lease liabilities.

Intangible Assets

(10) Intangible Assets

2020

Cost:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2020	$	15,012	$	3,347,148		$	4,183,505		$	3,548,006		$	11,093,671
Additions		—		1,201,288			212,269			862,063			2,275,620
Write-off		—		(312,411	)		(11,023	)		(915,703	)		(1,239,137	)
Reclassifications		—		(3,808	)		—			—			(3,808	)
Exchange effect		—		32,341			145,714			2,886			180,941
As of December 31, 2020	$	15,012	$	4,264,558		$	4,530,465		$	3,497,252		$	12,307,287

Accumulated Amortization and Impairment:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2020	$	7,398	$	951,176		$	2,299,223		$	2,637,627		$	5,895,424
Amortization		—		1,363,607			536,953			810,225			2,710,785
Write-off		—		(312,411	)		(11,023	)		(915,703	)		(1,239,137	)
Reclassifications		—		841			—			—			841
Exchange effect		—		31,815			26,884			2,762			61,461
As of December 31, 2020	$	7,398	$	2,035,028		$	2,852,037		$	2,534,911		$	7,429,374
Net carrying amount: As of December 31, 2020	$	7,614	$	2,229,530		$	1,678,428		$	962,341		$	4,877,913

2021

Cost:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	15,012	$	4,264,558		$	4,530,465		$	3,497,252		$	12,307,287
Additions		—		1,333,882			56,331			330,976			1,721,189
Write-off		—		(587,102	)		—			(458,295	)		(1,045,397	)
Reclassifications		—		(758	)		—			—			(758	)
Exchange effect		—		(165,543	)		(95,632	)		(21,862	)		(283,037	)
As of December 31, 2021	$	15,012	$	4,845,037		$	4,491,164		$	3,348,071		$	12,699,284

Accumulated Amortization and Impairment:

	Goodwill		Software			Patents and technology license fees			Others			Total
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2021	$	7,398	$	2,035,028		$	2,852,037		$	2,534,911		$	7,429,374
Amortization		—		1,566,948			538,874			747,617			2,853,439
Write-off		—		(587,102	)		—			(458,295	)		(1,045,397	)
Exchange effect		—		(101,050	)		(66,244	)		(15,771	)		(183,065	)
As of December 31, 2021	$	7,398	$	2,913,824		$	3,324,667		$	2,808,462		$	9,054,351
Net carrying amount: As of December 31, 2021	$	7,614	$	1,931,213		$	1,166,497		$	539,609		$	3,644,933

Amortization Amounts of Intangible Assets

The amortization amounts of intangible assets were as follows:

	For the years ended December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Operating costs	$	866,497	$	798,011
Operating expenses	$	1,844,288	$	2,055,428

Details of Loans

(11) Short-Term Loans

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Unsecured bank loans	$	11,057,132	$	1,924,124

	For the years ended December 31,
	2019	2020	2021
Interest rates applied	0.00%-4.55%	0.00%-4.05%	0.15%-3.60%

Financial Liabilities at Fair Value Through Profit or Loss, Current

(12) Financial Liabilities at Fair Value through Profit or Loss, Current

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Embedded derivatives in exchangeable bonds	$	—	$	2,380,599
Forward contracts		2,326		—
Total	$	2,326	$	2,380,599

Bonds Payable

(13) Bonds Payable

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured domestic bonds payable	$	18,700,000		$	31,300,000
Unsecured exchangeable bonds payable		—			10,817,047
Less: Discounts on bonds payable		(9,616	)		(1,580,389	)
Total		18,690,384			40,536,658
Less: Current or exchangeable portion due within one year		(1,999,910	)		(17,458,959	)
Net	$	16,690,474		$	23,077,699

Summary of Terms and Conditions of Bonds

a. UMC issued domestic unsecured corporate bonds. The terms and conditions of the bonds are as follows:

Term	Issuance date	Issued amount	Coupon rate		Repayment
Seven-year	In mid-March 2013	NT$2,500 million		1.50%	Interest was paid annually and the principal was fully repaid in March 2020.
Seven-year	In mid-June 2014	NT$2,000 million		1.70%	Interest was paid annually and the principal was fully repaid in June 2021.
Ten-year	In mid-June 2014	NT$3,000 million		1.95%	Interest will be paid annually and the principal will be repayable in June 2024 upon maturity.
Five-year	In late March 2017	NT$6,200 million		1.15%	Interest will be paid annually and the principal will be repayable in March 2022 upon maturity.
Seven-year	In late March 2017	NT$2,100 million		1.43%	Interest will be paid annually and the principal will be repayable in March 2024 upon maturity.
Five-year	In early October 2017	NT$2,000 million		0.94%	Interest will be paid annually and the principal will be repayable in October 2022 upon maturity.

Term	Issuance date	Issued amount	Coupon rate		Repayment
Seven-year	In early October 2017	NT$3,400 million		1.13%	Interest will be paid annually and the principal will be repayable in October 2024 upon maturity.
Five-year	In late April 2021	NT$5,500 million		0.57%	Interest will be paid annually and the principal will be repayable in April 2026 upon maturity.
Seven-year	In late April 2021	NT$2,000 million		0.63%	Interest will be paid annually and the principal will be repayable in April 2028 upon maturity.
Ten-year (green bond)	In late April 2021	NT$2,100 million		0.68%	Interest will be paid annually and the principal will be repayable in April 2031 upon maturity.
Five-year	In mid-December 2021	NT$5,000 million		0.63%	Interest will be paid annually and the principal will be repayable in December 2026 upon maturity.

Defined Benefit Plan Recognized on the Consolidated Balance Sheets

iii. The defined benefit plan recognized on the consolidated balance sheets were as follows:

	As of December 31,
	2020			2021
	NT$ (In Thousands)			NT$ (In Thousands)
Present value of the defined benefit obligation	$	(5,561,999	)	$	(5,458,333	)
Fair value of plan assets		1,399,345			1,581,012
Funded status		(4,162,654	)		(3,877,321	)
Net defined benefit liabilities, noncurrent recognized on the consolidated balance sheets	$	(4,162,654	)	$	(3,877,321	)

Major Categories of Plan Assets as a Percentage of Fair Value of the Total Plan Assets

iv. The major categories of plan assets as a percentage of the fair value of the total plan assets are as follows:

	As of December 31,
	2020			2021
Cash		16	%		24	%
Equity instruments		48	%		43	%
Debt instruments		25	%		23	%
Others		11	%		10	%

Principal Underlying Actuarial Assumptions

v. The principal underlying actuarial assumptions are as follows:

	As of December 31,
	2020			2021
Discount rate		0.29	%		0.62	%
Rate of future salary increase		3.50	%		4.25	%

Expected Future Benefit Payments

vi. Expected future benefit payments are as follows:

Year	As of December 31, 2021
	NT$ (In Thousands)
2022	$	373,879
2023		373,406
2024		397,426
2025		432,167
2026		435,179
2027 and thereafter		3,721,746
Total	$	5,733,803

Sensitivity Analysis

vii. Sensitivity analysis:

	As of December 31, 2020
	Discount rate				Rate of future salary increase
	0.5% increase		0.5% decrease		0.5% increase			0.5% decrease
	NT$ (In Thousands)		NT$ (In Thousands)		NT$ (In Thousands)			NT$ (In Thousands)
Decrease (increase) in defined benefit obligation	$	226,798	$	—	$	(204,390	)	$	195,078

	As of December 31, 2021
	Discount rate					Rate of future salary increase
	0.5% increase		0.5% decrease			0.5% increase			0.5% decrease
	NT$ (In Thousands)		NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)
Decrease (increase) in defined benefit obligation	$	207,999	$	(220,561	)	$	(184,551	)	$	176,567

Deferred Government Grants

(16) Deferred Government Grants

	As of December 31,
	2020			2021
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance	$	13,551,553		$	10,207,109
Arising during the period		578,844			2,498,990
Recorded in profit or loss:
Other operating income		(3,994,818	)		(4,069,055	)
Exchange effect		71,530			(93,246	)
Ending balance	$	10,207,109		$	8,543,798
Current (classified under other current liabilities)	$	3,836,211		$	4,096,742
Non-current (classified under other noncurrent liabilities)		6,370,898			4,447,056
Total	$	10,207,109		$	8,543,798

Summary of Refund Liabilities

(17) Refund Liabilities (classified under other current liabilities)

	As of December 31,
	2020		2021
	NT$ (In Thousands)		NT$ (In Thousands)
Refund liabilities	$	1,252,451	$	724,207

Purpose for Repurchase and Changes in Treasury Stock

i. UMC carried out a treasury stock program and repurchased its shares from the centralized securities exchange market. The purpose for the repurchase and changes in treasury stock during the years ended December 31, 2020 and 2021 were as follows:

For the year ended December 31, 2020

(In thousands of shares)

Purpose	As of January 1, 2020		Increase		Decrease		As of December 31, 2020
For transfer to employees		—		105,000		105,000		—

Details of Distribution

The details of appropriation were as follows:

	Appropriation of earnings (in thousand NT dollars)						Cash dividend per share (NT dollars)
	2020			2021			2020		2021
Legal reserve	$	3,197,890		$	5,832,570
Special reserve		(2,857,666	)		(3,250,434	)
Cash dividends		19,875,842			—		$	1.60	$	—

Non-controlling Interests

d. Non-controlling interests:

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Beginning balance	$	466,768		$	410,065		$	113,356
Attributable to non-controlling interests:
Net loss		(3,578,847	)		(2,009,077	)		(668,245	)
Other comprehensive income (loss)		(15,213	)		126,653			(19	)
Disposal of subsidiaries		—			(51,565	)		—
The differences between the fair value of the consideration paid or received from acquiring or disposing subsidiaries and the carrying amounts of the subsidiaries		—			106,879			—
Changes in subsidiaries’ ownership		24,740			(10,331	)		(11,126	)
Non-controlling interests		—			(551,608	)		23,430
Derecognition of the non-controlling interests		3,512,617			2,092,340			765,785
Ending balance	$	410,065		$	113,356		$	223,181

Summary of Assumptions Used for Compensation Cost for Cash-settled Share-based Payment Measured at Fair Value on Grant Date by using Black-Scholes Option Pricing Model

The compensation cost for the cash-settled share-based payment was measured at fair value on the grant date by using Black-Scholes Option Pricing Model and will be remeasured at the end of each reporting period until settlement. As of December 31, 2021, the assumptions used are as below:

	Granted in September 2020		Granted in June 2021
Share price of measurement date (NT$/ per share)	$	65.00	$	65.00
Expected volatility		40.11%-42.88%		38.52%-47.75%
Expected life		0.67-2.67 years		1.44-3.44 years
Expected dividend yield		5.27%		5.27%
Risk-free interest rate		0.32%-0.46%		0.38%-0.50%

Summary of Disaggregation of Revenue by Product

(20) Operating Revenues

a. Disaggregation of revenue

i. By product

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Wafer	$	142,625,019	$	169,885,201	$	204,594,399
Others		5,576,622		6,935,713		8,416,619
Total	$	148,201,641	$	176,820,914	$	213,011,018

Summary of Disaggregation of Revenue by Geography

ii. By geography 

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Taiwan	$	53,966,435	$	65,003,509	$	80,655,096
Singapore		23,979,343		26,054,856		29,068,748
China (includes Hong Kong)		19,115,188		22,629,388		31,176,136
Japan		9,855,772		15,363,352		13,705,192
USA		19,957,615		24,546,963		24,270,210
Europe		6,900,339		6,416,235		5,628,998
Others		14,426,949		16,806,611		28,506,638
Total	$	148,201,641	$	176,820,914	$	213,011,018

Summary of Disaggregation of Revenue by the Timing of Revenue Recognition

iii. By the timing of revenue recognition

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
At a point in time	$	147,057,035	$	174,492,036	$	211,074,982
Over time		1,144,606		2,328,878		1,936,036
Total	$	148,201,641	$	176,820,914	$	213,011,018

Summary of Balances of Contract Assets and Contract Liabilities

b. Contract balances

i. Contract assets, current

	As of January 1,			As of December 31,
	2020			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Sales of goods and services	$	599,491		$	625,222		$	677,326
Less: Loss allowance		(385,248	)		(367,381	)		(357,705	)
Net	$	214,243		$	257,841		$	319,621

ii. Contract liabilities

	As of January 1,		As of December 31,
	2020		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Sales of goods and services	$	1,470,195	$	2,497,469	$	4,083,140
Current	$	988,115	$	2,040,989	$	3,441,754
Non-current		482,080		456,480		641,386
Total	$	1,470,195	$	2,497,469	$	4,083,140

Employee Benefit, Depreciation and Amortization Expenses

The Company’s employee benefit, depreciation and amortization expenses are summarized as follows:

	For the years ended December 31,
	2019						2020						2021
	Operating costs		Operating expenses		Total		Operating costs		Operating expenses		Total		Operating costs		Operating expenses		Total
	NT$						NT$						NT$
	(In Thousands)						(In Thousands)						(In Thousands)
Employee benefit expenses
Salaries	$	17,109,432	$	7,712,792	$	24,822,224	$	20,367,325	$	9,412,151	$	29,779,476	$	23,388,888	$	11,806,207	$	35,195,095
Labor and health insurance		911,037		395,571		1,306,608		1,061,848		452,848		1,514,696		1,183,315		458,179		1,641,494
Pension		1,066,877		361,281		1,428,158		1,138,429		379,298		1,517,727		1,259,044		399,879		1,658,923
Other employee benefit expenses		303,358		124,631		427,989		274,838		121,858		396,696		335,829		144,668		480,497
Depreciation		45,068,673		1,841,954		46,910,627		43,969,732		1,926,226		45,895,958		42,002,745		1,908,719		43,911,464
Amortization		848,214		1,368,440		2,216,654		895,732		1,848,651		2,744,383		834,384		2,060,558		2,894,942

Details of Distribution of Employees' Compensation and Directors' Compensation

The details of distribution were as follows:

	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Employees’ compensation – Cash	$	1,132,952	$	2,581,675	$	4,770,909
Directors’ compensation		10,259		32,369		25,264

Net Other Operating Income and Expenses

(22) Net Other Operating Income and Expenses

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Government grants	$	5,366,907		$	5,179,643		$	5,269,412
Rental income from property, plant and equipment		200,351			198,860			187,166
Gain on disposal of property, plant and equipment		43,036			1,137,320			143,735
Impairment loss
Property, plant and equipment		(84,974	)		—			—
Goodwill		(7,398	)		—			—
Others		(335,760	)		(261,933	)		(373,482	)
Total	$	5,182,162		$	6,253,890		$	5,226,831

Non-Operating Income and Expenses

(23) Non-Operating Income and Expenses

a. Other gains and losses

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Gain on valuation of financial assets and liabilities at fair value through profit or loss	$	1,279,931		$	2,011,403		$	2,892,470
Impairment loss
Investments accounted for under the equity method		(25,762	)		—			—
Loss on disposal of investments		(16,293	)		(91,070	)		(16,388	)
Others		(71,147	)		(1,871,567	)		(2,009,952	)
Total	$	1,166,729		$	48,766		$	866,130

b. Finance costs

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Interest expenses
Bonds payable	$	672,902	$	377,193	$	437,055
Bank loans		1,808,633		1,417,028		1,285,708
Lease liabilities		178,112		154,730		145,187
Others		274,168		55,467		139
Financial expenses		63,828		69,015		94,841
Total	$	2,997,643	$	2,073,433	$	1,962,930

Components of Other Comprehensive Income (Loss)

	For the year ended December 31, 2019
	Arising during the period			Reclassification adjustments during the period		Other comprehensive income (loss), before tax			Income tax effect			Other comprehensive income (loss), net of tax
	NT$			NT$		NT$			NT$			NT$
	(In Thousands)			(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit pension plans	$	106,403		$	—	$	106,403		$	(21,281	)	$	85,122
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		5,486,209			—		5,486,209			(394,695	)		5,091,514
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		899,025			—		899,025			(41,643	)		857,382
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(3,292,023	)		14,085		(3,277,938	)		14,949			(3,262,989	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		8,799			6,594		15,393			(8,843	)		6,550
Total other comprehensive income (loss)	$	3,208,413		$	20,679	$	3,229,092		$	(451,513	)	$	2,777,579

	For the year ended December 31, 2020
	Arising during the period			Reclassification adjustments during the period			Other comprehensive income (loss), before tax			Income tax effect			Other comprehensive income (loss), net of tax
	NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit pension plans	$	(192,581	)	$	—		$	(192,581	)	$	38,516		$	(154,065	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		4,815,361			—			4,815,361			(134,887	)		4,680,474
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		883,508			—			883,508			(115,048	)		768,460
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(2,917,361	)		(2,919	)		(2,920,280	)		38,541			(2,881,739	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		37,474			22,843			60,317			7,372			67,689
Total other comprehensive income (loss)	$	2,626,401		$	19,924		$	2,646,325		$	(165,506	)	$	2,480,819

	For the year ended December 31, 2021
	Arising during the period			Reclassification adjustments during the period			Other comprehensive income (loss), before tax			Income tax effect			Other comprehensive income (loss), net of tax
	NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit pension plans	$	(197,477	)	$	—		$	(197,477	)	$	39,495		$	(157,982	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		5,811,342			—			5,811,342			(360,061	)		5,451,281
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		2,959,130			—			2,959,130			(96,510	)		2,862,620
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(4,743,299	)		2,283			(4,741,016	)		23,175			(4,717,841	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		(24,018	)		(394	)		(24,412	)		6,763			(17,649	)
Total other comprehensive income (loss)	$	3,805,678		$	1,889		$	3,807,567		$	(387,138	)	$	3,420,429

Major Components of Income Tax Expense

(25) Income Tax

a. The major components of income tax expense (benefit) for the years ended December 31, 2019, 2020 and 2021 were as follows:

i. Income tax expense (benefit) recorded in profit or loss

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Current income tax expense (benefit):
Current income tax charge	$	772,795		$	2,346,937		$	7,088,975
Adjustments in respect of current income tax of prior periods		(1,033,780	)		(1,140,060	)		(150,260	)
Deferred income tax expense (benefit):
Deferred income tax related to origination and reversal of temporary differences		465,530			49,035			407,280
Deferred income tax related to recognition and derecognition of tax losses and unused tax credits		231,971			683,080			723,270
Adjustment of prior year’s deferred income tax		121,189			(246,173	)		(130,841	)
Deferred income tax arising from write-down or reversal of write-down of deferred tax assets		(327,359	)		(1,736	)		(20,172	)
Income tax expense recorded in profit or loss	$	230,346		$	1,691,083		$	7,918,252

ii. Deferred income tax related to components of other comprehensive income (loss)

(i) Items that will not be reclassified subsequently to profit or loss:

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Remeasurements of defined benefit pension plans	$	(21,281	)	$	38,516		$	39,495
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		(394,695	)		(134,887	)		(360,061	)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		(41,643	)		(115,048	)		(96,510	)
Income tax related to items that will not be reclassified subsequently to profit or loss	$	(457,619	)	$	(211,419	)	$	(417,076	)

(ii) Items that may be reclassified subsequently to profit or loss:

	For the years ended December 31,
	2019			2020		2021
	NT$			NT$		NT$
	(In Thousands)			(In Thousands)		(In Thousands)
Exchange differences on translation of foreign operations	$	14,949		$	38,541	$	23,175
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		(8,843	)		7,372		6,763
Income tax related to items that may be reclassified subsequently to profit or loss	$	6,106		$	45,913	$	29,938

iii.   Income tax charged directly to equity    

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Current income tax expense (benefit):
Disposal of parent company’s stock by subsidiary recognized as treasury stock transactions	$	—		$	—		$	(203	)
Deferred income tax expense (benefit):
Recognize (reversal) of temporary difference arising from initial recognition of the equity component of the compound financial instrument		(45	)		3,691			—
Adjustments of changes in net assets of associates and joint ventures accounted for using equity method		(532	)		(91	)		22
Gains or losses on hedging instruments which will not be reclassified subsequently to profit or loss		(514	)		—			—
Income tax charged directly to equity	$	(1,091	)	$	3,600		$	(181	)

Reconciliation Between Income Tax Expense and Income Before Tax at UMC's Applicable Tax Rate

b. A reconciliation between income tax expense (benefit) and income before tax at UMC’s applicable tax rate were as follows:

	For the years ended December 31,
	2019			2020			2021
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Income before tax	$	4,806,596		$	22,542,750		$	58,496,432
At UMC’s statutory income tax rate		961,319			4,508,550			11,699,286
Adjustments in respect of current income tax of prior periods		(1,033,780	)		(1,140,060	)		(150,260	)
Net changes in loss carry-forward and investment tax credits		2,387,922			447,570			(845,267	)
Adjustment of deferred tax assets/liabilities for write-downs/reversals and different jurisdictional tax rates		(169,568	)		(505,537	)		183,123
Tax effect of non-taxable income and non-deductible expenses:
Tax exempt income		(1,778,820	)		(2,500,688	)		(3,258,695	)
Investment gain		(270,610	)		(431,501	)		(1,388,877	)
Dividend income		(139,093	)		(130,672	)		(171,725	)
Others		110,991			32,268			6,463
Basic tax		3,215			2,803			—
Estimated income tax on unappropriated earnings		150,401			1,087,216			1,558,031
Effect of different tax rates applicable to UMC and its subsidiaries		(102,608	)		(191,687	)		116,174
Taxes withheld in other jurisdictions		19,749			25,193			43,443
Others		91,228			487,628			126,556
Income tax expense recorded in profit or loss	$	230,346		$	1,691,083		$	7,918,252

Significant Components of Deferred Income Tax Assets and Liabilities

c. Significant components of deferred income tax assets and liabilities were as follows:

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Deferred income tax assets
Depreciation	$	2,116,855		$	2,155,961
Loss carry-forward		685,531			62,367
Pension		828,410			770,847
Refund liabilities		240,165			140,861
Allowance for inventory valuation losses		595,910			433,630
Investment loss		389,743			349,794
Unrealized profit on intercompany sales		1,348,202			1,125,370
Others		461,160			439,439
Total deferred income tax assets		6,665,976			5,478,269
Deferred income tax liabilities
Unrealized exchange gain		(559,334	)		(580,191	)
Depreciation		(156,000	)		(78,792	)
Investment gain		(933,038	)		(1,354,740	)
Bonds		—			(6,353	)
Amortizable assets		(316,049	)		(303,841	)
Others		(687	)		—
Total deferred income tax liabilities		(1,965,108	)		(2,323,917	)
Net deferred income tax assets	$	4,700,868		$	3,154,352

Movement of Deferred Tax

d. Movement of deferred tax

	For the years ended December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Balance as of January 1	$	5,342,127		$	4,700,868
Amounts recognized in profit or loss during the period		(484,206	)		(979,537	)
Amounts recognized in other comprehensive income (loss)		(165,506	)		(387,138	)
Amounts recognized in equity		3,600			22
Exchange adjustments		4,853			(179,863	)
Balance as of December 31	$	4,700,868		$	3,154,352

Earnings Per Share

(26) Earnings Per Share

a. Earnings per share-basic

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	8,155,097	$	22,860,744	$	51,246,425
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)		11,565,068		11,850,052		12,005,126
Earnings per share-basic (NTD)	$	0.71	$	1.93	$	4.27

b. Earnings per share-diluted

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	8,155,097	$	22,860,744	$	51,246,425
Effect of dilution
Unsecured convertible bonds		289,121		69,019		—
Income attributable to shareholders of the parent	$	8,444,218	$	22,929,763	$	51,246,425
Weighted—average number of ordinary shares for basic earnings per share (thousand shares)		11,565,068		11,850,052		12,005,126
Effect of dilution
Restricted stocks for employees		—		30,911		159,478
Employees’ compensation		90,047		65,657		80,243
Unsecured convertible bonds		1,295,729		303,630		—
Weighted—average number of ordinary shares after dilution (thousand shares)		12,950,844		12,250,250		12,244,847
Earnings per share-diluted (NTD)	$	0.65	$	1.87	$	4.19

Reconciliation of Liabilities Arising from Financing Activities

(27) Reconciliation of Liabilities Arising from Financing Activities

For the year ended December 31, 2019

	As of December 31, 2018		Cash Flows			Non-cash changes						As of December 31, 2019
Items						Foreign exchange			Others (Note A)
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	13,103,808	$	(993,723	)	$	(368,507	)	$	273,628		$	12,015,206
Long-term loans (current portion included)		30,826,215		3,876,991			(802,975	)		1,843			33,902,074
Bonds payable (current portion included)		41,378,182		(2,500,000	)		—			(96,766	)		38,781,416
Guarantee deposits (current portion included)		665,793		252,269			(2,021	)		(619,347	)		296,694 (Note E	)
Lease liabilities		6,006,457		(633,488	)		(78,432	)		736,488 (Note C	)		6,031,025
Other financial liabilities-noncurrent (Note B)		20,410,355		—			(698,127	)		381,213			20,093,441

For the year ended December 31, 2020

						Non-cash changes
Items	As of December 31, 2019		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2020
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	12,015,206	$	(933,392	)	$	(75,751	)	$	51,069		$	11,057,132
Long-term loans (current portion included)		33,902,074		136,920			(972,888	)		—			33,066,106
Bonds payable (current portion included)		38,781,416		(13,702,875	)		—			(6,388,157 (Note D	)  )		18,690,384
Guarantee deposits (current portion included)		296,694		(59,819	)		(883	)		—			235,992 (Note E	)
Lease liabilities		6,031,025		(726,626	)		(10,036	)		282,501			5,576,864
Other financial liabilities-noncurrent (Note B)		20,093,441		—			281,219			371,964			20,746,624

For the year ended December 31, 2021

						Non-cash changes
Items	As of December 31, 2020		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2021
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	11,057,132	$	(8,974,216	)	$	(158,792	)	$	—		$	1,924,124
Long-term loans (current portion included)		33,066,106		4,088,537			(529,736	)		—			36,624,907
Bonds payable (current portion included)		18,690,384		23,703,692			—			(1,857,418 (Note F	)  )		40,536,658
Guarantee deposits (current portion included)		235,992		14,219,408			(85,631	)		—			14,369,769 (Note E	)
Lease liabilities		5,576,864		(699,680	)		(144,419	)		335,989			5,068,754
Other financial liabilities (Note B)		20,746,624		—			(163,387	)		382,972			20,966,209

Note A: Other non-cash changes mainly consisted of discount amortization measured by the effective interest method.

Note B: Please refer to Note 9(6) for more details on other financial liabilities.

Note C: Including the impact from acquisition of a subsidiary.

Note D: Please refer to Note 6(13) for the Company’s convertible bonds.

Note E: Guarantee deposits mainly consisted of deposits of capacity reservation.

Note F: Please refer to Note 6(13) for the Company’s exchangeable bonds.

Summary of Net Cash Outflow Arising from Deconsolidation of the Subsidiary

c. Analysis of net cash outflow arising from deconsolidation of the subsidiary:

	NT$
	(In Thousands)
Cash received	$	722,559
Net cash of subsidiary derecognized		(776,586	)
Net cash outflow from deconsolidation	$	(54,027	)

NEXPOWER TECHNOLOGY CORP. [member]

Contents Of Significant Accounts [Line Items]

Summary of Derecognized Assets and Liabilities

a. Derecognized assets and liabilities mainly consisted of:

	NT$
	(In Thousands)
Assets
Cash and cash equivalents	$	776,586
Other current assets		18
		776,604
Liabilities
Other payables		(194	)
		(194	)
Net assets of the deconsolidation	$	776,410

Summary of Consideration Received and Gain (Loss) Recognized

b. Consideration received and gain recognized from the deconsolidation:

	NT$
	(In Thousands)
Cash received	$	722,559
Less: Net assets of the deconsolidation		(776,410	)
Add: Non-controlling interests		51,565
Other comprehensive income from equity reclassified to profit or loss due to derecognition		4,061
Gain on deconsolidation (Note A)	$	1,775

Unused tax credits [member]

Contents Of Significant Accounts [Line Items]

Unused Tax Credits and Losses

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Expiry period
1-5 years	$	40,910,279	$	38,562,420
6-10 years		2,674,422		2,730,567
Total	$	43,584,701	$	41,292,987

Plan assets [member]

Contents Of Significant Accounts [Line Items]

Defined Benefit Plan Recognized on the Consolidated Balance Sheets

ii. Movements in fair value of plan assets during the year:

	For the years ended December 31,
	2020			2021
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance of fair value of plan assets	$	1,385,696		$	1,399,345
Items recognized as profit or loss:
Interest income on plan assets		9,284			4,059
Contribution by employer		95,360			505,890
Benefits paid		(142,490	)		(349,750	)
Remeasurements recognized in other comprehensive income (loss):
Return on plan assets, excluding amounts included in interest income		51,495			21,468
Fair value of plan assets at end of year	$	1,399,345		$	1,581,012

Present value of defined benefit obligation [member]

Contents Of Significant Accounts [Line Items]

Defined Benefit Plan Recognized on the Consolidated Balance Sheets

i. Movements in present value of defined benefit obligation during the year:

	For the years ended December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Defined benefit obligation at beginning of year	$	(5,411,069	)	$	(5,561,999	)
Items recognized as profit or loss:
Service cost		(13,090	)		(11,009	)
Interest cost		(36,254	)		(16,130	)
Subtotal		(49,344	)		(27,139	)
Remeasurements recognized in other comprehensive income (loss):
Arising from changes in demographic assumptions		—			(4,537	)
Arising from changes in financial assumptions		(173,615	)		(123,140	)
Experience adjustments		(70,461	)		(91,268	)
Subtotal		(244,076	)		(218,945	)
Benefits paid		142,490			349,750
Defined benefit obligation at end of year	$	(5,561,999	)	$	(5,458,333	)

More than 1 year [member]

Contents Of Significant Accounts [Line Items]

Details of Loans

a. Details of long-term loans as of December 31, 2020 and 2021 were as follows:

	As of December 31,
Lenders	2020		2021		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Long-Term Loan from Mega International Commercial Bank (1)	$	1,640	$	—	Repayable quarterly from July 3, 2017 to July 5, 2021 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Mega International Commercial Bank (2)		19,464		14,598	Repayable quarterly from October 24, 2019 to October 24, 2024 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (1)		59,459		47,568	Repayable quarterly from October 19, 2015 to October 19, 2025 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (2)		21,146		13,125	Repayable monthly from May 31, 2019 to May 31, 2023 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (3)		56,000		44,000	Repayable monthly from August 13, 2020 to August 13, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (4)		28,965		22,759	Repayable monthly from October 29, 2020 to August 29, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (5)		—		101,000	Repayable monthly from April 15, 2021 to April 15, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Syndicated Loans from China Development Bank and 6 others (1) (Note A)		22,236,343		18,158,940	Repayable semi-annually from October 20, 2016 to October 20, 2024 with semi-annually interest payments. Interest-only payment for the first and the second year.

	As of December 31,
Lenders	2020		2021		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Syndicated Loans from China Development Bank and 6 others (2)		—		12,236,000	Repayable semi-annually from March 19, 2021 to March 18, 2031 with semi-annually interest payments. Interest-only payment for the first and the second year.
Secured Long-Term Loan from First Commercial Bank		—		47,000	Repayable monthly from December 2, 2021 to December 2, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from KGI Bank		—		21,000	Repayable semi-annually from December 27, 2021 to December 27, 2026 with monthly interest payments. Interest-only payment for the first and the second year.
Unsecured Long-Term Loan from ICBC Bank		1,702,589		—	Repayable semi-annually from September 20, 2019 to September 9, 2021 with quarterly interest payments. Interest-only payment for the first semi-annually year.
Unsecured Long-Term Loan from Xiamen Bank		440,500		436,126	Repayable semi-annually from November 24, 2020 to May 24, 2022 of RMB 0.1 million with monthly interest payments and the remaining principal will be repaid once at maturity. Interest-only payment for the first semi-annually year.
Unsecured Long-Term Loan from Bank of China		—		982,791	Repayable semi-annually from June 24, 2023 to June 24, 2026 with quarterly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan (1)		2,000,000		500,000	Repayable quarterly from March 10, 2022 to December 10, 2024 with monthly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan (2)		—		450,000	Repayable quarterly from March 24, 2023 to March 24, 2025 with monthly interest payments.
Unsecured Long-Term Loan from Taiwan Cooperative Bank		2,000,000		—	Repayable quarterly from May 5, 2023 to May 5, 2025 with monthly interest payments.
Unsecured Revolving Loan from Mega International Commercial Bank (Note B)		1,500,000		500,000	Repayable semi-annually from October 16, 2020 to April 16, 2022 with monthly interest payments.
Unsecured Revolving Loan from Taipei Fubon Bank (Note C)		700,000		200,000	Repayable annually from August 9, 2020 to August 9, 2023 with monthly interest payments.
Unsecured Revolving Loan from Chang Hwa Commercial Bank (Note D)		1,000,000		550,000	Repayable quarterly from January 27, 2021 to October 27, 2022 with monthly interest payments.
Unsecured Revolving Loan from KGI Bank (1) (Note E)		1,000,000		—	Repayable annually from December 11, 2021 to December 11, 2023 with monthly interest payments.
Unsecured Revolving Loan from KGI Bank (2) (Note E )		—		500,000	Repayable annually from August 10, 2023 to August 10, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (1) (Note F)		300,000		—	Settlement due on May 15, 2025 with monthly interest payments.

	As of December 31,
Lenders	2020			2021			Redemption
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured Revolving Loan from First Commercial Bank (2) (Note G)		—			300,000		Settlement due on February 25, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (3) (Note G)		—			300,000		Settlement due on March 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (4) (Note G)		—			200,000		Settlement due on June 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from Yuanta Commercial Bank (Note H)		—			1,000,000		Repayable annually from March 2, 2023 to March 2, 2026 with monthly interest payments.
Subtotal		33,066,106			36,624,907
Less: Current portion		(24,985,168	)		(19,873,011	)
Total	$	8,080,938		$	16,751,896

	For the years ended December 31,
	2019		2020		2021
Interest rates applied		0.55%-5.56%		0.84%-4.67%		0.85%-4.66%

Note A: USCXM, the subsidiary of UMC failed to comply with the loan covenant to maintain its financial ratio at certain level and therefore the loan is reclassified to current liabilities as of December 31, 2020 and 2021. The bank exemption of 2020 and 2021 have been obtained as of April 21, 2021 and February 7, 2022, respectively.

Note B: UMC entered into a 5-year loan agreement with Mega International Commercial Bank, effective from October 17, 2016. The agreement offered UMC a revolving line of credit of NT$3 billion. This line of credit will be reduced starting from the end of the two years and six months after the first use and every six months thereafter, with a total of six adjustments. The expiration date of the agreement is April 16, 2022. As of December 31, 2020 and 2021, the line of credit were fully utilized.

Note C: UMC entered into a 5-year loan agreement with Taipei Fubon Bank, effective from February 9, 2018. The agreement offered UMC a revolving line of credit of NT$2 billion. This line of credit will be reduced starting from the end of the two years after the first use and every twelve months thereafter, with a total of four adjustments. The expiration date of the agreement is August 9, 2023. As of December 31, 2020 and 2021, the unused line of credit were both NT$0.8 billion.

Note D: UMC entered into a 5-year loan agreement with Chang Hwa Commercial Bank, effective from November 2, 2016. The agreement offered UMC a revolving line of credit of NT$3 billion. This line of credit will be reduced starting from the end of the third year after the first use and every three months thereafter, with a total of nine adjustments. The expiration date of the agreement is October 27, 2022. As of December 31, 2020 and 2021, the unused line of credit were NT$1.7 billion and NT$0.8 billion, respectively.

Note E: UMC entered into a 5-year loan agreement with KGI Commercial Bank, effective from September 11, 2018. The agreement offered UMC a revolving line of credit of NT$2.5 billion which has been modified into NT$3 billion as of May 10, 2021. This line of credit will be reduced starting from the end of the second year after the first use and every twelve months thereafter, with a total of four adjustments. The expiration date of the agreement is August 10, 2026. As of December 31, 2020 and 2021, the unused line of credit were NT$1 billion and NT$2.5 billion, respectively.

Note F: First Commercial Bank approved the 1-year credit loan on December 30, 2019, which has expired on December 30, 2020.

Note G: First Commercial Bank approved the 1-year credit loan on January 18, 2021, which offered UMC a revolving line of credit of NT$2 billion starting from the approval date to January 17, 2022. As of December 31, 2021, the unused line of credit was NT$1.2 billion.

Note H: UMC entered into a 5-year loan agreement with Yuanta Commercial Bank, effective from March 3, 2021. The agreement offered UMC a revolving line of credit of NT$4 billion. This line of credit will be reduced starting from the end of the second year after the contract date and every twelve months thereafter, with a total of four adjustments. The expiration date of the agreement is March 2, 2026. As of December 31, 2021, the unused line of credit was NT$3 billion.

Aggregated individually immaterial associates [member]

Contents Of Significant Accounts [Line Items]

Aggregate Amount of the Company's Share of its Individually Immaterial Associates

The aggregate amount of the Company’s share of all its individually immaterial associates that are accounted for using the equity method were as follows:

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Profit from continuing operations	$	115,329	$	1,300,263	$	5,193,495
Other comprehensive income		873,308		973,946		2,965,202
Total comprehensive income	$	988,637	$	2,274,209	$	8,158,697

Trade receivables [member]

Contents Of Significant Accounts [Line Items]

Financial Assets

(4) Accounts Receivable, Net

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Accounts receivable	$	27,300,439		$	34,818,600
Less: loss allowance		(206,084	)		(194,491	)
Net	$	27,094,355		$	34,624,109

Financial assets at fair value through profit or loss [member]

Contents Of Significant Accounts [Line Items]

Financial Assets

(2) Financial Assets at Fair Value through Profit or Loss

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets mandatorily measured at fair value through profit or loss
Common stocks	$	9,654,682	$	13,289,438
Preferred stocks		3,299,004		2,602,622
Funds		2,674,476		3,862,932
Convertible bonds		412,175		691,303
Forward contracts		2,384		—
Total	$	16,042,721	$	20,446,295
Current	$	1,216,634	$	945,021
Non-current		14,826,087		19,501,274
Total	$	16,042,721	$	20,446,295

Financial assets at fair value through other comprehensive income [member]

Contents Of Significant Accounts [Line Items]

Financial Assets

(3) Financial Assets at Fair Value through Other Comprehensive Income

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Equity instruments
Common stocks	$	10,355,999	$	19,683,806
Preferred stocks		170,145		151,859
Total	$	10,526,144	$	19,835,665
Current	$	—	$	8,482,334
Non-current		10,526,144		11,353,331
Total	$	10,526,144	$	19,835,665

XML

Significant Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2021

Statement [Line Items]

Key Management Personnel Compensation

c. Key management personnel compensation

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Short-term employee benefits	$	271,135	$	435,251	$	562,117
Post-employment benefits		2,406		2,458		2,322
Termination benefits		3,415		283		—
Share-based payment		62,203		365,666		1,035,401
Others		578		571		578
Total	$	339,737	$	804,229	$	1,600,418

Subsidiaries [member]

Statement [Line Items]

Significant Transactions Between the Company and Related Parties

For the year ended December 31, 2019

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	47,736,335		Net 60 days
UMC	UMC-USA	Accounts receivable		5,937,706		—
UMC	UMC GROUP JAPAN	Sales		3,933,964		Net 60 days
UMC	UMC GROUP JAPAN	Accounts receivable		608,622		—
UMC	USCXM	Sales		1,209,310 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		31,334		—
UMC	USCXM	Loan receivable		1,201,200		—
USCXM	UMC-USA	Sales		745,226		Net 60 days
USCXM	UMC-USA	Accounts receivable		33,242		—
HJ	UMC-USA	Sales		152,012		Net 60 days
HJ	UMC-USA	Accounts receivable		21,138		—
HJ	UMC GROUP JAPAN	Sales		250,736		Net 60 days
HJ	UMC GROUP JAPAN	Accounts receivable		51,150		—

For the year ended December 31, 2020

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	49,357,981		Net 60 days
UMC	UMC-USA	Accounts receivable		5,388,172		—
UMC	UMC GROUP JAPAN	Sales		1,220,419		Net 60 days
UMC	USCXM	Sales		1,183,180 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		24,831		—
USCXM	UMC-USA	Sales		970,358		Net 60 days
USCXM	UMC-USA	Accounts receivable		250,092		—
HJ	UMC-USA	Sales		137,860		Net 60 days
HJ	UMC-USA	Accounts receivable		33,069		—
HJ	UMC GROUP JAPAN	Sales		106,077		Net 60 days
USJC	UMC-USA	Sales		1,395,094		Net 60 days
USJC	UMC-USA	Accounts receivable		456,860		—

For the year ended December 31, 2021

Entity	Counterparty	Transactions (Note D)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	48,440,369		Net 60 days
UMC	UMC-USA	Accounts receivable		6,286,428		—
UMC	USCXM	Sales		1,222,320 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		29,012		—
UMC	UDS	Sales		178,331		Net 30 days
UMC	UDS	Accounts receivable		18,818		—
USJC	UMC-USA	Sales		2,917,993		Net 60 days
USJC	UMC-USA	Accounts receivable		428,363		—
USCXM	UMC-USA	Sales		1,444,736		Net 60 days
USCXM	UMC-USA	Accounts receivable		221,375		—
WAVETEK	UMC-USA	Sales		545,785		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		126,580		—
WAVETEK	UMC	Sales		110,620		Month-end 30 days
HJ	UMC-USA	Sales		366,968		Net 60 days
HJ	UMC-USA	Accounts receivable		60,147		—

Note A: The significant intercompany transactions listed above include downstream transactions.

Note B: The sales price to the above related parties was determined through mutual agreement in reference to market conditions.

Note C: UMC authorized technology licenses to its subsidiary, USCXM, in the amount of US$0.35 billion, which was recognized as deferred revenue to be realized over time.

Note D: The significant intercompany transactions listed above include downstream and upstream transactions.

Other related parties [member]

Statement [Line Items]

Significant Transactions Between the Company and Related Parties

b. Significant transactions between the Company and other related parties were as follows:

(i) Name and Relationship of Related Parties

Name of related parties	Relationship with the Company
FARADAY TECHNOLOGY CORP. and its Subsidiaries	Associate
HSUN CHIEH INVESTMENT CO., LTD.	Associate
HSUN CHIEH CAPITAL CORP.	Associate
TRIKNIGHT CAPITAL CORPORATION	Associate
UNIMICRON TECHNOLOGY CORP.	Associate
SILICON INTEGRATED SYSTEMS CORP.	The Company’s director
PHOTRONICS DNP MASK CORPORATION	Other related parties
UNITEDVISION SEMICONDUCTOR CO., LTD.	Other related parties
UPI SEMICONDUCTOR CORP.	Other related parties
UNISTARS CORPORATION	Other related parties

(ii) Operating revenues

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	1,532,339	$	2,085,425	$	2,778,544
Others		45,523		26,856		38,797
Total	$	1,577,862	$	2,112,281	$	2,817,341

(iii) Accounts receivable, net

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	172,808	$	555,064
Others		6,110		11,274
Total	$	178,918	$	566,338

The sales price to the above related parties was determined through mutual agreement in reference to market conditions. The collection periods for domestic sales to related parties were month-end 30-60 days, while the collection periods for overseas sales were month-end or net 30-60 days.

(iv) Refund liabilities (classified under other current liabilities)

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	1,186	$	1,841
Others		36		27
Total	$	1,222	$	1,868

(v) Significant asset transactions

Acquisition of financial assets at fair value through profit or loss, noncurrent

					For the year ended December 31, 2019
	Trading Volume (In thousands of shares)		Transaction underlying		Purchase price
					NT$
					(In Thousands)
Associates		500		Stock of MATERIALS ANALYSIS TECHNOLOGY INC.	$	32,923
Associates		1,900		Stock of GEAR RADIO LTD.		37,211
Total					$	70,134

				For the year ended December 31, 2020
	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		1,000	Stock of WELLYSUN INC.	$	25,000

				For the year ended December 31, 2021
	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		82	Stock of ARTERY TECHNOLOGY CORPORATION	$	13,929

Acquisition of investments accounted for under the equity method

				For the year ended December 31, 2019
	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		72,000	Stock	$	720,000

For the years ended December 31, 2020 and 2021: None.

Acquisition of intangible assets

	Purchase price
	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	339,463	$	335,425	$	181,254

(vi)   Others
Mask expenditure
	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Others	$	2,346,263	$	1,811,827	$	1,861,438

Other payables of mask expenditure
	As of December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Others	$	683,892	$	532,810	$	560,042

XML

Assets Pledged as Collateral (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Assets Pledged As Collateral [Abstract]

Summary of Assets Pledged as Collateral

8. ASSETS PLEDGED AS COLLATERAL

The following table lists assets of the Company pledged as collateral:

	As of December 31,
	2020		2021		Party to which asset(s) was pledged	Purpose of pledge
	NT$		NT$
	(In Thousands)		(In Thousands)
Refundable Deposits (Time deposit)	$	811,072	$	811,660	Customs	Customs duty guarantee
Refundable Deposits (Time deposit)		234,286		234,304	Science Park Bureau	Collateral for land lease
Refundable Deposits (Time deposit)		18,215		20,619	Science Park Bureau	Collateral for dormitory lease
Refundable Deposits (Time deposit)		41,785		26,600	Liquefied Natural Gas Business Division, CPC Corporation, Taiwan	Energy resources guarantee

	As of December 31,
	2020		2021		Party to which asset(s) was pledged	Purpose of pledge
	NT$		NT$
	(In Thousands)		(In Thousands)
Refundable Deposits (Time deposit)		1,000,000		1,151,200	Bank of China and Agricultural Bank of China	Bank performance guarantee
Refundable Deposits (Bank deposit)		—		6,711	Shanghai Commercial Bank	Collateral for letter of credit
Buildings		5,310,769		5,014,814	Taiwan Cooperative Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Machinery and equipment		21,370,450		25,189,533	Taiwan Cooperative Bank, Mega International Commercial Bank, KGI Bank, First Commercial Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Transportation equipment		3,174		1,802	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Furniture and fixtures		281,663		161,604	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Right-of-use assets		289,552		280,697	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Total	$	29,360,966	$	32,899,544

XML

Financial Risk and Fair Value Disclosures (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure of detailed information about financial instruments [line items]

Categories of Financial Instruments

(1) Categories of financial instruments

	As of December 31,
Financial Assets	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets at fair value through profit or loss	$	16,042,721	$	20,446,295
Financial assets at fair value through other comprehensive income		10,526,144		19,835,665
Financial assets measured at amortized cost
Cash and cash equivalents (cash on hand excluded)		94,042,271		132,616,447
Receivables		28,942,147		36,047,680
Refundable deposits		2,310,961		2,358,549
Other financial assets		14,386,131		28,863,470
Total	$	166,250,375	$	240,168,106

	As of December 31,
Financial Liabilities	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial liabilities at fair value through profit or loss	$	2,326	$	2,380,599
Financial liabilities measured at amortized cost
Short-term loans		11,057,132		1,924,124
Payables		31,188,794		37,657,300
Guarantee deposits (current portion included)		235,992		14,369,769
Bonds payable (current portion included)		18,690,384		40,536,658
Long-term loans (current portion included)		33,066,106		36,624,907
Lease liabilities		5,576,864		5,068,754
Other financial liabilities		20,746,624		20,966,209
Total	$	120,564,222	$	159,528,320

Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments and Contractual Maturity

The table below summarizes the maturity profile of the Company’s financial liabilities based on the contractual undiscounted payments and contractual maturity:

	As of December 31, 2020
	Less than 1 year			2 to 3 years		4 to 5 years		> 5 years		Total
	NT$			NT$		NT$		NT$		NT$
	(In Thousands)			(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Non-derivative financial liabilities
Short-term loans	$	11,240,785		$	—	$	—	$	—	$	11,240,785
Payables		31,008,010			—		—		—		31,008,010
Guarantee deposits		793			163,618		—		71,581		235,992
Bonds payable		2,374,587			8,484,393		8,563,021		—		19,422,001
Long-term loans		25,885,932			5,889,382		2,424,965		—		34,200,279
Lease liabilities		695,790			1,280,476		1,102,021		3,354,217		6,432,504
Other financial liabilities		—			17,120,418		4,280,333		—		21,400,751
Total	$	71,205,897		$	32,938,287	$	16,370,340	$	3,425,798	$	123,940,322
Derivative financial liabilities
Forward exchange contracts
Gross settlement
Inflow	$	393,442		$	—	$	—	$	—	$	393,442
Outflow		(395,768	)		—		—		—		(395,768	)
Net	$	(2,326	)	$	—	$	—	$	—	$	(2,326	)

	As of December 31, 2021
	Less than 1 year		2 to 3 years		4 to 5 years		> 5 years		Total
	NT$		NT$		NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Non-derivative financial liabilities
Short-term loans	$	1,939,109	$	—	$	—	$	—	$	1,939,109
Payables		37,455,640		—		—		—		37,455,640
Guarantee deposits		108,740		3,432,749		—		10,828,280		14,369,769
Bonds payable (Note)		8,612,255		8,869,431		10,656,506		4,178,008		32,316,200
Long-term loans		21,084,795		2,543,611		11,021,076		5,976,645		40,626,127
Lease liabilities		688,613		1,198,528		1,050,786		2,841,010		5,778,937
Other financial liabilities		12,738,246		8,492,466		—		—		21,230,712
Total	$	82,627,398	$	24,536,785	$	22,728,368	$	23,823,943	$	153,716,494

Details of Forward Exchange Contracts

The details of forward exchange contracts entered into by UMC are summarized as follows:

As of December 31, 2020

Type	Notional Amount	Contract Period
Forward exchange contracts	Sell USD 82 million	December 11, 2020-February 5, 2021

As of December 31, 2021

None.

Reconciliation for Fair Value Measurement in Level 3 Fair Value Hierarchy

Reconciliation for fair value measurement in Level 3 fair value hierarchy were as follows:

	Financial assets at fair value through profit or loss															Financial assets at fair value through other comprehensive income
	Common stock			Preferred stock			Funds			Convertible bonds			Total			Common stock		Preferred stock			Total
	NT$			NT$			NT$			NT$			NT$			NT$		NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)		(In Thousands)			(In Thousands)
As of January 1, 2020	$	2,880,688		$	3,279,294		$	2,011,025		$	104,708		$	8,275,715		$	1,130,430	$	175,494		$	1,305,924
Recognized in profit (loss)		589,664			180,523			19,611			39,648			829,446			—		—			—
Recognized in other comprehensive income (loss)		—			—			—			—			—			167,197		(5,349	)		161,848
Acquisition		547,932			294,251			340,323			303,456			1,485,962			—		—			—
Disposal		(308,041	)		(374,112	)		—			(227,223	)		(909,376	)		—		—			—
Return of capital		(1,903	)		—			—			—			(1,903	)		—		—			—
Transfer out of Level 3		(428,188	)		—			—			—			(428,188	)		—		—			—
Exchange effect		(38,674	)		(100,953	)		(56,943	)		(4,259	)		(200,829	)		—		—			—
As of December 31, 2020	$	3,241,478		$	3,279,003		$	2,314,016		$	216,330		$	9,050,827		$	1,297,627	$	170,145		$	1,467,772

	Financial assets at fair value through profit or loss															Financial assets at fair value through other comprehensive income
	Common stock			Preferred stock			Funds			Convertible bonds			Total			Common stock		Preferred stock			Total
	NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)			NT$ (In Thousands)		NT$ (In Thousands)			NT$ (In Thousands)
As of January 1, 2021	$	3,241,478		$	3,279,003		$	2,314,016		$	216,330		$	9,050,827		$	1,297,627	$	170,145		$	1,467,772
Recognized in profit (loss)		278,951			(818,848	)		1,061,793			(6,895	)		515,001			—		—			—
Recognized in other comprehensive income (loss)		—			—			—			—			—			1,053,976		(18,286	)		1,035,690
Acquisition		695,146			829,751			201,649			111,094			1,837,640			—		—			—
Disposal		(447,915	)		(660,904	)		—			(83,814	)		(1,192,633	)		—		—			—
Return of capital		(252	)		—			(69,084	)		—			(69,336	)		—		—			—
Transfer out of Level 3		(161,564	)		—			—			—			(161,564	)		—		—			—
Exchange effect		(21,518	)		(48,756	)		(43,722	)		(1,779	)		(115,775	)		—		—			—
As of December 31, 2021	$	3,584,326		$	2,580,246		$	3,464,652		$	234,936		$	9,864,160		$	2,351,603	$	151,859		$	2,503,462

Reconciliation for Fair Value Measurement in Level 3 Derivatives Financial Liabilities

	Financial liabilities at fair value through profit or loss
	Derivatives
	NT$ (In Thousands)
As of January 1, 2021	$	—
Recognized in profit (loss)		360,494
Issuance		2,020,105
As of December 31, 2021	$	2,380,599

Summary of Significant Unobservable Inputs of Fair Value Measurement in Level 3 Fair Value Hierarchy

Significant unobservable inputs of fair value measurement in Level 3 fair value hierarchy were as follows:

As of December 31, 2020
Category	Valuation technique	Significant unobservable inputs	Quantitative information	Interrelationship between inputs and fair value	Sensitivity analysis of interrelationship between inputs and fair value
Unlisted stock	Market Approach	Discount for lack of marketability	0%-50%	The greater degree of lack of marketability, the lower the estimated fair value is determined.	A change of 5% in the discount for lack of marketability of the aforementioned fair values of unlisted stocks could decrease/increase the Company’s profit (loss) for the year ended December 31, 2020 by NT$283 million and NT$231 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2020 by NT$106 million.

As of December 31, 2021
Category	Valuation technique	Significant unobservable inputs	Quantitative information	Interrelationship between inputs and fair value	Sensitivity analysis of interrelationship between inputs and fair value
Unlisted stock	Market Approach	Discount for lack of marketability	0%-50%	The greater degree of lack of marketability, the lower the estimated fair value is determined.	A change of 5% in the discount for lack of marketability of the aforementioned fair values of unlisted stocks could decrease/increase the Company’s profit (loss) for the year ended December 31, 2021 by NT$281 million and NT$242 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2021 by NT$186 million.
Embedded derivatives in exchangeable bonds	Binomial tree valuation model	Volatility	45.84%	The higher the volatility, the higher the estimated fair value is determined.	A change of 5% in the volatility could decrease/increase the Company’s profit (loss) for the year ended December 31, 2021 by NT$283 million and NT$278 million, respectively.

Recurring fair value measurement [member]

Disclosure of detailed information about financial instruments [line items]

Assets and Liabilities Measured and Recorded at Fair Value

a. Assets and liabilities measured and recorded at fair value on a recurring basis:

	As of December 31, 2020
	Level 1		Level 2		Level 3		Total
	NT$		NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Financial assets:
Financial assets at fair value through profit or loss, current	$	1,049,334	$	2,384	$	164,916	$	1,216,634
Financial assets at fair value through profit or loss, noncurrent		5,546,320		393,856		8,885,911		14,826,087
Financial assets at fair value through other comprehensive income, noncurrent		9,058,372		—		1,467,772		10,526,144
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		2,326		—		2,326

	As of December 31, 2021
	Level 1		Level 2		Level 3		Total
	NT$		NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)		(In Thousands)
Financial assets:
Financial assets at fair value through profit or loss, current	$	761,320	$	—	$	183,701	$	945,021
Financial assets at fair value through profit or loss, noncurrent		9,323,064		497,751		9,680,459		19,501,274
Financial assets at fair value through other comprehensive income, current		8,482,334		—		—		8,482,334
Financial assets at fair value through other comprehensive income, noncurrent		8,849,869		—		2,503,462		11,353,331
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		—		2,380,599		2,380,599

Not measured at fair value in statement of financial position but for which fair value is disclosed [member]

Disclosure of detailed information about financial instruments [line items]

Assets and Liabilities Measured and Recorded at Fair Value

The fair values of the Company’s short-term financial instruments including cash and cash equivalents, receivables, refundable deposits, other financial assets, short-term loans, payables and guarantee deposits approximate their carrying amount due to their maturities within one year.

As of December 31, 2020
		Fair value measurements during reporting period using
Items	Fair value	Level 1	Level 2	Level 3	Carrying amount
	NT$ (In Thousands)	NT$ (In Thousands)	NT$ (In Thousands)	NT$ (In Thousands)	NT$ (In Thousands)

Bonds payables (current portion included)	$	18,861,597	$	18,861,597	$	—	$	—	$	18,690,384
Long-term loans (current portion included)		33,066,106		—		33,066,106		—		33,066,106

As of December 31, 2021
		Fair value measurements during reporting period using
Items	Fair value	Level 1	Level 2	Level 3	Carrying amount
	NT$	NT$	NT$	NT$	NT$
	(In Thousands)	(In Thousands)	(In Thousands)	(In Thousands)	(In Thousands)

Bonds payables (current portion included)	$	41,947,014	$	31,442,469	$	10,504,545	$	—	$	40,536,658
Long-term loans (current portion included)		36,624,907		—		36,624,907		—		36,624,907

XML

Operating Segment Information (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure of operating segments [abstract]

Geographic Non-current Assets Information

	As of December 31,
	2020		2021
	NT$		NT$
	(In Thousands)		(In Thousands)
Taiwan	$	64,563,752	$	81,505,018
Singapore		11,621,141		10,610,974
China (includes Hong Kong)		59,643,273		48,667,135
Japan		11,591,851		10,010,255
USA		46,484		24,116
Europe		21,257		18,210
Others		1,126		2,489
Total	$	147,488,884	$	150,838,197

Individual Customers Accounting for at least 10% of Operating Revenues

Individual customers accounting for at least 10% of operating revenues for the years ended December 31, 2019, 2020 and 2021 were as follows:

	For the years ended December 31,
	2019		2020		2021
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Customer A from wafer fabrication segment	$	17,576,293	$	20,380,814	$	21,935,208

XML

Capital Management (Tables)

12 Months Ended

Dec. 31, 2021

Capital Management [Abstract]

Debt to Capital Ratios

The Company’s strategy, which is unchanged for the reporting periods, is to maintain a reasonable ratio in order to raise capital with reasonable cost. The debt to capital ratios as of December 31, 2020 and 2021 were as follows:

	As of December 31,
	2020			2021
	NT$			NT$
	(In Thousands)			(In Thousands)
Total liabilities	$	143,314,539		$	186,580,294
Less: Cash and cash equivalents		(94,048,036	)		(132,622,131	)
Net debt		49,266,503			53,958,163
Total equity		223,139,562			264,375,047
Total capital	$	272,406,065		$	318,333,210
Debt to capital ratios		18.09	%		16.95	%

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Summary of Significant Accounting Policies - Consolidated Entities (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
UMC GROUP (USA) [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	IC Sales
Percentage of ownership	100.00%	100.00%
UNITED MICROELECTRONICS (EUROPE) B.V. [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Marketing support activities
Percentage of ownership	100.00%	100.00%
UMC CAPITAL CORP. [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
GREEN EARTH LIMITED (GE) [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
TLC CAPITAL CO., LTD. (TLC) [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Venture capital
Percentage of ownership	100.00%	100.00%
UMC INVESTMENT (SAMOA) LIMITED [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
FORTUNE VENTURE CAPITAL CORP. (FORTUNE) [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Consulting and planning for venture capital
Percentage of ownership	100.00%	100.00%
UMC KOREA CO., LTD. [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Marketing support activities
Percentage of ownership	100.00%	100.00%
OMNI GLOBAL LIMITED (OMNI) [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
SINO PARAGON LIMITED [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
BEST ELITE INTERNATIONAL LIMITED (BE) [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
UNITED SEMICONDUCTOR JAPAN CO., LTD. [member]
Disclosure of subsidiaries [line items]
Investor	UMC
Business nature	Sales and manufacturing of integrated circuits
Percentage of ownership	100.00%	100.00%
WAVETEK MICROELECTRONICS CORPORATION (WAVETEK) [member]
Disclosure of subsidiaries [line items]
Investor	UMC and FORTUNE
Business nature	Sales and manufacturing of integrated circuits
Percentage of ownership	80.37%	81.40%
SOARING CAPITAL CORP. [member]
Disclosure of subsidiaries [line items]
Investor	TLC
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
UNITRUTH ADVISOR (SHANGHAI) CO., LTD. [member]
Disclosure of subsidiaries [line items]
Investor	SOARING CAPITAL CORP.
Business nature	Investment holding and advisory
Percentage of ownership	100.00%	100.00%
UNITED MICROCHIP CORPORATION [member]
Disclosure of subsidiaries [line items]
Investor	GE
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
TERA ENERGY DEVELOPMENT CO., LTD. (TERA ENERGY) [member]
Disclosure of subsidiaries [line items]
Investor	FORTUNE
Business nature	Energy technical services
Percentage of ownership	100.00%	100.00%
EVERRICH ENERGY INVESTMENT (HK) LIMITED (EVERRICH-HK) [member]
Disclosure of subsidiaries [line items]
Investor	TERA ENERGY
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
EVERRICH (SHANDONG) ENERGY CO., LTD. [member]
Disclosure of subsidiaries [line items]
Investor	EVERRICH-HK
Business nature	Solar engineering integrated design services
Percentage of ownership	100.00%	100.00%
UNITED MICROTECHNOLOGY CORPORATION (CALIFORNIA) [member]
Disclosure of subsidiaries [line items]
Investor	OMNI
Business nature	Research and development
Percentage of ownership	100.00%	100.00%
ECP VITA PTE. LTD. [member]
Disclosure of subsidiaries [line items]
Investor	OMNI
Business nature	Insurance
Percentage of ownership	100.00%	100.00%
UMC TECHNOLOGY JAPAN CO., LTD. [member]
Disclosure of subsidiaries [line items]
Investor	OMNI
Business nature	Semiconductor manufacturing technology development and consulting services
Percentage of ownership		100.00%
WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA) [member]
Disclosure of subsidiaries [line items]
Investor	WAVETEK
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
WAVETEK MICROELECTRONICS CORPORATION (USA) [member]
Disclosure of subsidiaries [line items]
Investor	WAVETEK-SAMOA
Business nature	Marketing service
Percentage of ownership	100.00%	100.00%
INFOSHINE TECHNOLOGY LIMITED (INFOSHINE) [member]
Disclosure of subsidiaries [line items]
Investor	BE
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
OAKWOOD ASSOCIATES LIMITED (OAKWOOD) [member]
Disclosure of subsidiaries [line items]
Investor	INFOSHINE
Business nature	Investment holding
Percentage of ownership	100.00%	100.00%
HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member]
Disclosure of subsidiaries [line items]
Investor	OAKWOOD
Business nature	Sales and manufacturing of integrated circuits
Percentage of ownership	99.9985%	99.9985%
UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. [member]
Disclosure of subsidiaries [line items]
Investor	HJ
Business nature	Integrated circuits design services
Percentage of ownership	100.00%	100.00%
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member]
Disclosure of subsidiaries [line items]
Investor	UNITED MICROCHIP CORPORATION and HJ
Business nature	Sales and manufacturing of integrated circuits
Percentage of ownership	69.95%	67.76%

XML

Summary of Significant Accounting Policies - Additional Information (Detail)	Dec. 31, 2021 Exchange_Rate
Disclosure Of Initial Application Of Standards Or Interpretations [Abstract]
Convenience translation into U.S. Dollars, rate of USD1.00	27.74

XML

Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2021
Buildings [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	7 years
Buildings [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	56 years
Machinery and equipment [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	6 years
Machinery and equipment [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	7 years
Transportation equipment [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	6 years
Transportation equipment [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	7 years
Furniture and fixtures [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	3 years
Furniture and fixtures [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	7 years
Leasehold improvement [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	The shorter of lease terms or useful lives

XML

Summary of Significant Accounting Policies - Intangible Assets - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021
Software [member] | Bottom of range [member]
Disclosure of initial application of standards or interpretations [line items]
Estimated useful life of intangible assets	3 Years
Software [member] | Top of range [member]
Disclosure of initial application of standards or interpretations [line items]
Estimated useful life of intangible assets	6 years
Patent and technology license fee [member] | Bottom of range [member]
Disclosure of initial application of standards or interpretations [line items]
Estimated useful life of intangible assets	5 Years
Patent and technology license fee [member] | Top of range [member]
Disclosure of initial application of standards or interpretations [line items]
Estimated useful life of intangible assets	10 years
Others [member]
Disclosure of initial application of standards or interpretations [line items]
Estimated useful life of intangible assets	the shorter of the contract term or estimated useful life (3 years)

XML

Contents of Significant Accounts - Cash and Cash Equivalents (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Cash And Cash Equivalents [Abstract]
Cash on hand and petty cash	$ 5,684		$ 5,765
Checking and savings accounts	33,738,883		20,163,007
Time deposits	88,876,572		66,939,601
Repurchase agreements collateralized by government bonds and corporate notes	10,000,992		6,939,663
Total	$ 132,622,131	$ 4,780,899	$ 94,048,036	$ 3,390,340	$ 95,492,477	$ 83,661,739

XML

Contents of Significant Accounts - Financial Assets at Fair Value through Profit or Loss (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of financial assets [line items]
Total	$ 20,446,295		$ 16,042,721
Current	945,021	$ 34,067	1,216,634
Noncurrent	19,501,274	$ 703,002	14,826,087
Common stocks [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	13,289,438		9,654,682
Preferred stocks [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	2,602,622		3,299,004
Funds [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	3,862,932		2,674,476
Convertible bonds [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	691,303		412,175
Forward exchange contracts [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	$ 0		$ 2,384

XML

Contents of Significant Accounts - Financial Assets at Fair Value through Profit or Loss (Parenthetical) (Detail) - ChipBond Technology Corporation [Member] - shares shares in Millions	Nov. 05, 2021	Sep. 03, 2021
Disclosure of financial assets [line items]
Number of shares exchanged in	53
Fortune Venture Capital Corp [Member]
Disclosure of financial assets [line items]
Number of shares exchanged in	14	14

XML

Contents of Significant Accounts - Financial Assets at Fair Value through Other Comprehensive Income, Non-Current (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of financial assets [line items]
Financial assets at fair value through other comprehensive income, current	$ 8,482,334	$ 305,780
Financial assets at fair value through other comprehensive income, non-current	11,353,331	$ 409,277	$ 10,526,144
Total	19,835,665		10,526,144
Common stock [member]
Disclosure of financial assets [line items]
Total	19,683,806		10,355,999
Preferred stocks [member]
Disclosure of financial assets [line items]
Total	$ 151,859		$ 170,145

XML

Contents of Significant Accounts - Summary of Fair Value of Each Investment in Equity Instrument (Detail) - TWD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Fair value of investments in equity instruments	$ 8,482,000
SILICON INTEGRATED SYSTEMS CORP. [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Fair value of investments in equity instruments	3,407,886	$ 2,039,645
UNIMICRON HOLDING LIMITED [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Fair value of investments in equity instruments	1,461,098	722,122
ITE TECH. INC. [Member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Fair value of investments in equity instruments	1,514,658	950,674
NOVATEK MICROELECTRONICS CORP. [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Fair value of investments in equity instruments	8,863,632	6,068,053
SHIN-ETSU HANDOTAI TAIWAN CO., LTD. [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Fair value of investments in equity instruments	890,505	575,505
MTIC HOLDINGS PTE. LTD. [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Fair value of investments in equity instruments	151,859	$ 170,145
CHIPBOND TECHNOLOGY CORPORATION
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Fair value of investments in equity instruments	$ 3,546,027

XML

Contents of Significant Accounts - Summary of Fair Value of Each Investment in Equity Instrument (Parenthetical) (Detail) shares in Millions	Nov. 05, 2021 shares
ChipBond Technology Corporation [Member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Number of shares exchanged in	53

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Contents of Significant Accounts - Accounts Receivable, Net (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of financial assets [line items]
Accounts receivable, net	$ 34,624,109	$ 1,248,165	$ 27,094,355
Cost [member]
Disclosure of financial assets [line items]
Accounts receivable, net	34,818,600		27,300,439
Loss Allowance [member]
Disclosure of financial assets [line items]
Loss Allowance	$ (194,491)		$ (206,084)

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Contents of Significant Accounts - Summary of Income Recognized in Profit or Loss from Equity Instruments Designated as Fair Value Through Other Comprehensive Income (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Dividend Income [Abstract]
Held at end of period	$ 465,679	$ 286,795
Derecognized during the period	0	0
Total	$ 465,679	$ 286,795

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Contents of Significant Accounts - Aging Analysis of Accounts Receivables (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of financial assets [line items]
Accounts receivable, net	$ 34,624,109	$ 1,248,165	$ 27,094,355
Cost [member]
Disclosure of financial assets [line items]
Accounts receivable, net	34,818,600		27,300,439
Neither past due [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable, net	30,758,397		23,801,905
Past due [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable, net	4,060,203		3,498,534
Past due [member] | Less than or equal to 30 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable, net	3,294,617		2,730,865
Past due [member] | 31 to 60 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable, net	138,854		95,398
Past due [member] | 61 to 90 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable, net	8,026		13,258
Past due [member] | 91 to 120 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable, net	43,413		23,774
Past due [member] | Greater than or equal to 121 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable, net	$ 575,293		$ 635,239

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Contents of Significant Accounts - Movement of Loss Allowance (Detail) - Trade receivables [member] - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of financial assets [line items]
Beginning balance	$ 206,084	$ 621,410
Net reversal for the period	(11,593)	(415,326)
Ending balance	$ 194,491	$ 206,084

XML

Contents of Significant Accounts - Accounts Receivable, Net - Additional Information (Detail)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Top of range [member]
Disclosure of financial assets [line items]
Expected credit loss rate	0.20%	0.20%	0.20%

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Contents of Significant Accounts - Inventories, Net (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Classes Of Inventories [Abstract]
Raw materials	$ 3,371,520		$ 5,507,002
Supplies and spare parts	5,106,770		4,290,672
Work in process	14,043,143		11,872,971
Finished goods	489,750		881,841
Total	$ 23,011,183	$ 829,531	$ 22,552,486

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Contents of Significant Accounts - Inventories, Net - Additional Information (Detail) - TWD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Classes Of Inventories [Abstract]
Inventories recognized in operating costs	$ 135,856,000,000	$ 133,143,000,000	$ 122,999,000,000
Write-down of inventories			$ 820,000,000
Inventories pledged	0	0
Reversal of write-down of inventories	$ 426,000,000	$ 272,000,000

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Contents of Significant Accounts - Summary of disposed and derecognized partial equity instrument investments measured at fair value through other comprehensive income (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Disposed And Derecognized Partial Equity Instrument Investments Measured At Fair Value Through Other Comprehensive Income [Abstract]
Fair value on the date of disposal	$ 0	$ 9,012,450
Cumulative gains (losses) reclassified to retained earnings due to derecognition	$ 0	$ 1,825,365

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Contents of Significant Accounts - Details of Investments Accounted for Under the Equity Method (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2021 USD ($)
Investments in associates and joint ventures [line items]
Amount	$ 28,138,378	$ 20,330,138	$ 1,014,361
FARADAY TECHNOLOGY CORP. (FARADAY) [member]
Investments in associates and joint ventures [line items]
Amount	$ 1,767,821	$ 1,583,971
Percentage of ownership or voting rights, Associates	13.78%	13.78%
UNIMICRON TECHNOLOGY CORP. [member]
Investments in associates and joint ventures [line items]
Amount	$ 10,337,813	$ 9,072,632
Percentage of ownership or voting rights, Associates	13.30%	13.36%
MTIC HOLDINGS PTE. LTD. [member]
Investments in associates and joint ventures [line items]
Amount	$ 0	$ 26,966
Percentage of ownership or voting rights, Associates	45.44%	45.44%
PURIUMFIL INC.[Member]
Investments in associates and joint ventures [line items]
Amount	$ 7,253	$ 6,206
Percentage of ownership or voting rights, Associates	44.45%	44.45%
UNITECH CAPITAL INC. [member]
Investments in associates and joint ventures [line items]
Amount	$ 976,559	$ 823,185
Percentage of ownership or voting rights, Associates	42.00%	42.00%
TRIKNIGHT CAPITAL CORPORATION [member]
Investments in associates and joint ventures [line items]
Amount	$ 4,044,867	$ 2,481,874
Percentage of ownership or voting rights, Associates	40.00%	40.00%
HSUN CHIEH CAPITAL CORP. [member]
Investments in associates and joint ventures [line items]
Amount	$ 229,598	$ 195,675
Percentage of ownership or voting rights, Associates	40.00%	40.00%
HSUN CHIEH INVESTMENT CO., LTD. [member]
Investments in associates and joint ventures [line items]
Amount	$ 3,437,053	$ 2,312,698
Percentage of ownership or voting rights, Associates	36.49%	36.49%
YANN YUAN INVESTMENT CO., LTD. [member]
Investments in associates and joint ventures [line items]
Amount	$ 7,013,118	$ 3,554,979
Percentage of ownership or voting rights, Associates	28.22%	30.87%
UNITED LED CORPORATION HONG KONG LIMITED [member]
Investments in associates and joint ventures [line items]
Amount	$ 98,954	$ 96,026
Percentage of ownership or voting rights, Associates	25.14%	25.14%
VSENSE CO., LTD. [member]
Investments in associates and joint ventures [line items]
Amount	$ 0	$ 941
Percentage of ownership or voting rights, Associates	23.98%	23.98%
TRANSLINK CAPITAL PARTNERS I, L.P. [member]
Investments in associates and joint ventures [line items]
Amount	$ 225,342	$ 174,985
Percentage of ownership or voting rights, Associates	10.38%	10.38%

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Contents of Significant Accounts - Investments Accounted For Under the Equity Method - Additional Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2021 USD ($)
Investments in associates [Line Items]
Investments accounted for using equity method for which there are published price quotations	$ 28,138,378	$ 20,330,138		$ 1,014,361
Aggregated individually immaterial associates [member]
Investments in associates [Line Items]
Exchange differences arising from translation of the foreign entity	(30,000)	(53,000)	$ (9,000)
Investments with published price quotations [member]
Investments in associates [Line Items]
Investments accounted for using equity method for which there are published price quotations	12,106,000	10,657,000
Investments with published price quotations [member] | Fair value [member]
Investments in associates [Line Items]
Investments accounted for using equity method for which there are published price quotations	$ 53,491,000	$ 18,885,000

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Contents of Significant Accounts - Aggregate Amount of the Company's Share of its Individually Immaterial Associates (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of associates [line items]
Profit from continuing operations	$ 5,193,495	$ 187,221	$ 1,300,263	$ 115,329
Aggregated individually immaterial associates [member]
Disclosure of associates [line items]
Profit from continuing operations	5,193,495		1,300,263	115,329
Other comprehensive income	2,965,202		973,946	873,308
Total comprehensive income	$ 8,158,697		$ 2,274,209	$ 988,637

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Contents of Significant Accounts - Summary of Other Current Assets (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure Of Significant Investments In Associates [Abstract]
Time deposits with original maturities of over three months to a year	$ 28,834,684		$ 14,305,779
Others	2,988,182		2,945,390
Total	$ 31,822,866	$ 1,147,183	$ 17,251,169

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Contents of Significant Accounts - Property, Plant and Equipment (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 132,774,663
Depreciation	44,179,632	$ 1,592,633	$ 46,163,693	$ 47,172,881
Ending balance	129,941,703	$ 4,684,272	132,774,663
Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	130,727,527
Ending balance	127,989,504		130,727,527
Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	2,047,136
Ending balance	1,952,199		2,047,136
Cost [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	934,074,194		918,234,715
Additions	38,284,083		26,420,747
Disposals	3,636,773		6,816,087
Transfers and reclassifications	4,479,497		1,969,871
Exchange effect	(6,797,031)		(5,735,052)
Ending balance	966,403,970		934,074,194	918,234,715
Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	4,351,979		4,537,499
Disposals			179,132
Transfers and reclassifications	(47,516)
Exchange effect	(20,361)		(6,388)
Ending balance	4,284,102		4,351,979	4,537,499
Accumulated depreciation, amortisation and impairment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(803,346,667)		(770,150,860)
Depreciation	43,346,944		45,304,505
Disposals	(3,606,726)		(6,269,807)
Transfers and reclassifications	127,058		(842)
Exchange effect	(4,799,477)		(5,838,049)
Ending balance	(838,414,466)		(803,346,667)	(770,150,860)
Accumulated depreciation, amortisation and impairment [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(2,304,843)		(2,247,258)
Depreciation	161,477		169,879
Disposals			(107,240)
Transfers and reclassifications	(127,058)
Exchange effect	(7,359)		(5,054)
Ending balance	(2,331,903)		(2,304,843)	(2,247,258)
Land [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,690,613
Ending balance	1,491,343		1,690,613
Land [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	459,622
Ending balance	549,010		459,622
Land [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,690,613		1,692,123
Additions	0
Disposals	0
Transfers and reclassifications	(96,439)
Exchange effect	(102,831)		(1,510)
Ending balance	1,491,343		1,690,613	1,692,123
Land [member] | Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	459,622		459,635
Transfers and reclassifications	96,439
Exchange effect	(7,051)		(13)
Ending balance	549,010		459,622	459,635
Land [member] | Accumulated depreciation, amortisation and impairment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	0
Depreciation	0
Disposals	0
Transfers and reclassifications	0
Exchange effect	0
Ending balance	0		0
Land [member] | Accumulated depreciation, amortisation and impairment [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	0
Depreciation	0
Transfers and reclassifications	0
Exchange effect	0
Ending balance	0		0
Buildings [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	17,406,222
Ending balance	15,642,511		17,406,222
Buildings [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,443,766
Ending balance	1,327,276		1,443,766
Buildings [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	37,257,510		38,437,588
Additions	0
Disposals	20,455		1,316,833
Transfers and reclassifications	114,081		109,586
Exchange effect	(523,656)		27,169
Ending balance	36,827,480		37,257,510	38,437,588
Buildings [member] | Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	2,451,311		2,637,271
Disposals			179,132
Transfers and reclassifications	(18,542)
Exchange effect	(10,380)		(6,828)
Ending balance	2,422,389		2,451,311	2,637,271
Buildings [member] | Accumulated depreciation, amortisation and impairment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(19,851,288)		(18,950,520)
Depreciation	1,474,241		1,688,455
Disposals	(20,455)		(788,342)
Transfers and reclassifications	1,645
Exchange effect	(121,750)		655
Ending balance	(21,184,969)		(19,851,288)	(18,950,520)
Buildings [member] | Accumulated depreciation, amortisation and impairment [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(1,007,545)		(1,019,036)
Depreciation	94,130		100,454
Disposals			(107,240)
Transfers and reclassifications	(1,645)
Exchange effect	(4,917)		(4,705)
Ending balance	(1,095,113)		(1,007,545)	(1,019,036)
Machinery and equipment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	93,881,980
Ending balance	86,901,818		93,881,980
Machinery and equipment [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Ending balance	0
Machinery and equipment [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	871,569,325		865,547,572
Additions	0
Disposals	3,587,695		5,305,744
Transfers and reclassifications	35,718,256		17,142,065
Exchange effect	(5,893,187)		(5,814,568)
Ending balance	897,806,699		871,569,325	865,547,572
Machinery and equipment [member] | Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	125,413		125,413
Transfers and reclassifications	(125,413)
Exchange effect	0
Ending balance	0		125,413	125,413
Machinery and equipment [member] | Accumulated depreciation, amortisation and impairment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(777,687,345)		(745,722,965)
Depreciation	41,329,061		43,089,767
Disposals	(3,580,477)		(5,301,373)
Transfers and reclassifications	125,413
Exchange effect	(4,656,461)		(5,824,014)
Ending balance	(810,904,881)		(777,687,345)	(745,722,965)
Machinery and equipment [member] | Accumulated depreciation, amortisation and impairment [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(125,413)		(125,413)
Depreciation	0
Transfers and reclassifications	(125,413)
Exchange effect	0
Ending balance	0		(125,413)	(125,413)
Transportation equipment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	12,166
Ending balance	8,851		12,166
Transportation equipment [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	54,898		65,909
Additions	0
Disposals	791		10,856
Transfers and reclassifications	2,158
Exchange effect	(306)		(155)
Ending balance	55,959		54,898	65,909
Transportation equipment [member] | Accumulated depreciation, amortisation and impairment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(42,732)		(47,794)
Depreciation	5,310		5,334
Disposals	(791)		(10,412)
Transfers and reclassifications	0
Exchange effect	(143)		16
Ending balance	(47,108)		(42,732)	(47,794)
Furniture and fixtures [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,193,439
Ending balance	1,082,791		1,193,439
Furniture and fixtures [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	143,748
Ending balance	75,913		143,748
Furniture and fixtures [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	6,908,778		6,842,124
Additions	0
Disposals	5,010		169,716
Transfers and reclassifications	433,504		246,622
Exchange effect	(32,098)		(10,252)
Ending balance	7,305,174		6,908,778	6,842,124
Furniture and fixtures [member] | Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,315,633		1,315,180
Transfers and reclassifications	0
Exchange effect	(2,930)		453
Ending balance	1,312,703		1,315,633	1,315,180
Furniture and fixtures [member] | Accumulated depreciation, amortisation and impairment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(5,715,339)		(5,383,434)
Depreciation	531,085		513,055
Disposals	(5,003)		(169,680)
Transfers and reclassifications	0		1,082
Exchange effect	(19,038)		(12,552)
Ending balance	(6,222,383)		(5,715,339)	(5,383,434)
Furniture and fixtures [member] | Accumulated depreciation, amortisation and impairment [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(1,171,885)		(1,102,809)
Depreciation	67,347		69,425
Transfers and reclassifications	0
Exchange effect	(2,442)		(349)
Ending balance	(1,236,790)		(1,171,885)	(1,102,809)
Leasehold improvement [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	13,811
Ending balance	6,157		13,811
Leasehold improvement [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	63,774		65,883
Additions	0
Disposals	0
Transfers and reclassifications	204		62
Exchange effect	(2,696)		(2,171)
Ending balance	61,282		63,774	65,883
Leasehold improvement [member] | Accumulated depreciation, amortisation and impairment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(49,963)		(46,147)
Depreciation	7,247		7,894
Disposals	0
Transfers and reclassifications	0		(1,924)
Exchange effect	(2,085)		(2,154)
Ending balance	(55,125)		(49,963)	(46,147)
Construction in progress and equipment awaiting inspection [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	16,529,296
Ending balance	22,856,033		16,529,296
Construction in progress and equipment awaiting inspection [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	16,529,296		5,583,516
Additions	38,284,083		26,420,747
Disposals	22,822		12,938
Transfers and reclassifications	(31,692,267)		(15,528,464)
Exchange effect	(242,257)		66,435
Ending balance	22,856,033		16,529,296	$ 5,583,516
Construction in progress and equipment awaiting inspection [member] | Accumulated depreciation, amortisation and impairment [member] | Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	0
Depreciation	0
Disposals	0
Transfers and reclassifications	0
Exchange effect	0
Ending balance	$ 0		$ 0

XML

Contents of Significant Accounts - Property, Plant and Equipment - Additional Information (Detail) $ in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2020 TWD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of detailed information about property, plant and equipment [line items]
Other operating income (expense)		$ 5,226,831	$ 188,422	$ 6,253,890	$ 5,182,162
Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Other operating income (expense)	$ 1,081,000

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Contents of Significant Accounts - Leases (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2021 USD ($)
Disclosure Of Lease By Lessee [Line Items]
Depreciation	$ 671,211	$ 689,309
Right-of-use assets	7,126,845	7,748,042	$ 256,916
Current	557,873	550,147	20,111
Noncurrent	4,510,881	5,026,717	$ 162,613
Total	5,068,754	5,576,864
Land [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	325,268	333,402
Right-of-use assets	4,877,702	5,146,342
Buildings [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	121,373	120,111
Right-of-use assets	284,011	352,119
Machinery and equipment [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	210,188	223,120
Right-of-use assets	1,940,084	2,227,035
Transportation equipment [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	9,858	8,145
Right-of-use assets	18,704	12,252
Other property, plant and equipment [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	4,524	4,531
Right-of-use assets	$ 6,344	$ 10,294

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Contents of Significant Accounts - Leases - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosures Of Leases [Abstract]
Addition to right of use assets	$ 207	$ 567

XML

Contents of Significant Accounts - Intangible Assets (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	$ 4,877,913
Ending balance	3,644,933	$ 131,396	$ 4,877,913
Net carrying amount:
Intangible assets	3,644,933		4,877,913
Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	12,307,287		11,093,671
Additions	1,721,189		2,275,620
Write-off	(1,045,397)		(1,239,137)
Reclassifications	(758)		(3,808)
Exchange effect	(283,037)		180,941
Ending balance	12,699,284		12,307,287
Net carrying amount:
Intangible assets	12,699,284		12,307,287
Accumulated depreciation, amortisation and impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	(7,429,374)		(5,895,424)
Amortization	2,853,439		2,710,785
Write-off	(1,045,397)		(1,239,137)
Reclassifications			841
Exchange effect	(183,065)		61,461
Ending balance	(9,054,351)		(7,429,374)
Net carrying amount:
Intangible assets	(9,054,351)		(7,429,374)
Goodwill [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	7,614
Ending balance	7,614		7,614
Net carrying amount:
Intangible assets	7,614		7,614
Goodwill [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	15,012		15,012
Additions	0
Write-off	0
Reclassifications	0
Exchange effect	0
Ending balance	15,012		15,012
Net carrying amount:
Intangible assets	15,012		15,012
Goodwill [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	(7,398)		(7,398)
Amortization	0
Write-off	0
Exchange effect	0
Ending balance	(7,398)		(7,398)
Net carrying amount:
Intangible assets	(7,398)		(7,398)
Software [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	2,229,530
Ending balance	1,931,213		2,229,530
Net carrying amount:
Intangible assets	1,931,213		2,229,530
Software [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	4,264,558		3,347,148
Additions	1,333,882		1,201,288
Write-off	(587,102)		(312,411)
Reclassifications	(758)		(3,808)
Exchange effect	(165,543)		32,341
Ending balance	4,845,037		4,264,558
Net carrying amount:
Intangible assets	4,845,037		4,264,558
Software [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	(2,035,028)		(951,176)
Amortization	1,566,948		1,363,607
Write-off	(587,102)		(312,411)
Reclassifications			841
Exchange effect	(101,050)		31,815
Ending balance	(2,913,824)		(2,035,028)
Net carrying amount:
Intangible assets	(2,913,824)		(2,035,028)
Patent and technology license fee [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	1,678,428
Ending balance	1,166,497		1,678,428
Net carrying amount:
Intangible assets	1,166,497		1,678,428
Patent and technology license fee [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	4,530,465		4,183,505
Additions	56,331		212,269
Write-off	0		(11,023)
Reclassifications	0
Exchange effect	(95,632)		145,714
Ending balance	4,491,164		4,530,465
Net carrying amount:
Intangible assets	4,491,164		4,530,465
Patent and technology license fee [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	(2,852,037)		(2,299,223)
Amortization	538,874		536,953
Write-off	0		(11,023)
Exchange effect	(66,244)		26,884
Ending balance	(3,324,667)		(2,852,037)
Net carrying amount:
Intangible assets	(3,324,667)		(2,852,037)
Others [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	962,341
Ending balance	539,609		962,341
Net carrying amount:
Intangible assets	539,609		962,341
Others [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	3,497,252		3,548,006
Additions	330,976		862,063
Write-off	(458,295)		(915,703)
Reclassifications	0
Exchange effect	(21,862)		2,886
Ending balance	3,348,071		3,497,252
Net carrying amount:
Intangible assets	3,348,071		3,497,252
Others [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	(2,534,911)		(2,637,627)
Amortization	747,617		810,225
Write-off	(458,295)		(915,703)
Exchange effect	(15,771)		2,762
Ending balance	(2,808,462)		(2,534,911)
Net carrying amount:
Intangible assets	$ (2,808,462)		$ (2,534,911)

XML

Contents of Significant Accounts - Amortization Amounts of Intangible Assets (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating costs [member]
Disclosure Of Intangible Assets [Line Items]
Amortization amounts of intangible assets	$ 798,011	$ 866,497
Operating expenses [member]
Disclosure Of Intangible Assets [Line Items]
Amortization amounts of intangible assets	$ 2,055,428	$ 1,844,288

XML

Contents of Significant Accounts - Short-Term Loans (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Short-term loans	$ 1,924,124	$ 69,363	$ 11,057,132
Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rates applied	0.15%	0.15%	0.00%	0.00%
Top of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rates applied	3.60%	3.60%	4.05%	4.55%
Unsecured bank loans [member]
Disclosure of detailed information about borrowings [line items]
Short-term loans	$ 1,924,124		$ 11,057,132

XML

Contents of Significant Accounts - Short-Term Loans - Additional Information (Detail) - TWD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Short term lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Unused short-term lines of credit	$ 72,743	$ 63,177

XML

Contents of Significant Accounts - Financial Liabilities at Fair Value through Profit or Loss, Current (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Current Financial Liabilities At Fair Value Through Profit Or Loss [Line Items]
Financial liabilities at fair value through profit or loss, current	$ 2,380,599	$ 85,818	$ 2,326
Embedded derivatives in exchangeable bonds [Member]
Current Financial Liabilities At Fair Value Through Profit Or Loss [Line Items]
Financial liabilities at fair value through profit or loss, current	2,380,599
Forward contract [member]
Current Financial Liabilities At Fair Value Through Profit Or Loss [Line Items]
Financial liabilities at fair value through profit or loss, current	$ 0		$ 2,326

XML

Contents of Significant Accounts - Bonds Payable (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of detailed information about bonds [Line Items]
Bonds payable	$ 40,536,658		$ 18,690,384
Less: Current portion	(17,458,959)		(1,999,910)
Net	23,077,699	$ 831,929	16,690,474
Discounts on bonds payable [member]
Disclosure of detailed information about bonds [Line Items]
Bonds payable	(1,580,389)		(9,616)
Unsecured domestic bonds payable [member] | Cost [member]
Disclosure of detailed information about bonds [Line Items]
Bonds payable	31,300,000		$ 18,700,000
Unsecured exchangeable bonds payable [member] | Cost [member]
Disclosure of detailed information about bonds [Line Items]
Bonds payable	$ 10,817,047

XML

Contents of Significant Accounts - Summary of Terms and Conditions of Bonds (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	May 18, 2015 USD ($)
Disclosure of detailed information about bonds [Line Items]
Issued amount	$ 40,536,658	$ 18,690,384	$ 600
Domestic unsecured corporate bonds maturing in March 2020 [member]
Disclosure of detailed information about bonds [Line Items]
Term	Seven-year
Issuance date	In mid-March 2013
Issued amount	$ 2,500,000
Coupon rate	1.50%
Repayment	Interest was paid annually and the principal was fully repaid in March 2020.
Domestic unsecured corporate bonds maturing in June 2021 [member]
Disclosure of detailed information about bonds [Line Items]
Term	Seven-year
Issuance date	In mid-June 2014
Issued amount	$ 2,000,000
Coupon rate	1.70%
Repayment	Interest was paid annually and the principal was fully repaid in June 2021.
Domestic unsecured corporate bonds maturing in June 2024 [member]
Disclosure of detailed information about bonds [Line Items]
Term	Ten-year
Issuance date	In mid-June 2014
Issued amount	$ 3,000,000
Coupon rate	1.95%
Repayment	Interest will be paid annually and the principal will be repayable in June 2024 upon maturity.
Domestic unsecured corporate bonds maturing in March 2022 [member]
Disclosure of detailed information about bonds [Line Items]
Term	Five-year
Issuance date	In late March 2017
Issued amount	$ 6,200,000
Coupon rate	1.15%
Repayment	Interest will be paid annually and the principal will be repayable in March 2022 upon maturity.
Domestic unsecured corporate bonds maturing in March 2024 [member]
Disclosure of detailed information about bonds [Line Items]
Term	Seven-year
Issuance date	In late March 2017
Issued amount	$ 2,100,000
Coupon rate	1.43%
Repayment	Interest will be paid annually and the principal will be repayable in March 2024 upon maturity.
Domestic unsecured corporate bonds maturing in October 2022 [member]
Disclosure of detailed information about bonds [Line Items]
Term	Five-year
Issuance date	In early October 2017
Issued amount	$ 2,000,000
Coupon rate	0.94%
Repayment	Interest will be paid annually and the principal will be repayable in October 2022 upon maturity.
Domestic unsecured corporate bonds maturing in October 2024 [member]
Disclosure of detailed information about bonds [Line Items]
Term	Seven-year
Issuance date	In early October 2017
Issued amount	$ 3,400,000
Coupon rate	1.13%
Repayment	Interest will be paid annually and the principal will be repayable in October 2024 upon maturity.
Domestic unsecured corporate bonds maturing in April 2026 [Member]
Disclosure of detailed information about bonds [Line Items]
Term	Five-year
Issuance date	In late April 2021
Issued amount	$ 5,500,000
Coupon rate	0.57%
Repayment	Interest will be paid annually and the principal will be repayable in April 2026 upon maturity.
Domestic unsecured corporate bonds maturing in April 2028 [Member]
Disclosure of detailed information about bonds [Line Items]
Term	Seven-year
Issuance date	In late April 2021
Issued amount	$ 2,000,000
Coupon rate	0.63%
Repayment	Interest will be paid annually and the principal will be repayable in April 2028 upon maturity.
Domestic unsecured corporate bonds maturing in April 2031 [Member]
Disclosure of detailed information about bonds [Line Items]
Term	Ten-year (green bond)
Issuance date	In late April 2021
Issued amount	$ 2,100,000
Coupon rate	0.68%
Repayment	Interest will be paid annually and the principal will be repayable in April 2031 upon maturity.
Domestic unsecured corporate bonds maturing in December 2026 [member]
Disclosure of detailed information about bonds [Line Items]
Term	Five-year
Issuance date	In mid-December 2021
Issued amount	$ 5,000,000
Coupon rate	0.63%
Repayment	Interest will be paid annually and the principal will be repayable in December 2026 upon maturity.

XML

Contents of Significant Accounts - Bonds Payable - Additional Information (Detail) $ / shares in Units, shares in Millions						12 Months Ended
	Jul. 07, 2024	Jul. 07, 2021 USD ($) TWD ($)	May 18, 2020 TWD ($)	May 18, 2018	May 18, 2015 TWD ($) $ / shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2021 TWD ($) $ / shares	Jul. 07, 2021 $ / shares	Dec. 31, 2020 TWD ($)	May 18, 2020 USD ($)	May 18, 2015 USD ($)
Disclosure of detailed information about bonds [Line Items]
Bonds issued amount								$ 40,536,658,000		$ 18,690,384,000		$ 600,000,000
Convertible bonds						$ 215,000,000	$ 15,000,000
Convertible bonds converted into shares | shares						465	33
Currency linked zero coupon convertible bonds maturing on May 18, 2020 [member]
Disclosure of detailed information about bonds [Line Items]
Per annum interest rate related to early redemption of bonds					(0.25%)
Early Redemption Price, fixed exchange rate					30.708							1.00
Percentage of principal amount, bond will be redeemable for early redemption				99.25%
Conversion price per share | $ / shares					$ 17.50
Percentage of principal amount to redeem bonds on maturity date			98.76%
Value of the conversion right of the convertible bonds determined at issuance					$ 1,894,000,000
Principal amount of redemption											$ 369,000,000
Convertible bonds, issuance costs					$ 9,000,000
Effective interest rate on the liability component of the convertible bonds					2.03%
Cancelled convertible rights			$ 1,166,000,000
Currency linked zero coupon convertible bonds maturing on May 18, 2020 [member] | Bottom of range [member]
Disclosure of detailed information about bonds [Line Items]
Minimum holding period before issuer may redeem bonds					3 years
Percentage of closing stock price to conversion price for early redemption of bonds					125.00%
Percentage of principal amount that has already been converted, redeemed or repurchased and cancelled, where issuer may redeem the bonds					90.00%
Currency linked zero coupon exchangeable bonds maturing on July 7, 2026 [member]
Disclosure of detailed information about bonds [Line Items]
Bonds issued amount		$ 400,000,000
Per annum interest rate related to early redemption of bonds		(0.625%)
Early Redemption Price, fixed exchange rate		27.902
Percentage of principal amount, bond will be redeemable for early redemption	98.14%
Effective rate of the host bonds		3.49%
Currency linked zero coupon exchangeable bonds maturing on July 7, 2026 [member] | Bottom of range [member]
Disclosure of detailed information about bonds [Line Items]
Percentage of closing stock price to quotient of early redemption amount multiplied by then exchange price divided by principal amount of bonds		130.00%
Percentage of the bonds that have been previously redeemed, repurchased and cancelled or exchanged, where issuer may redeem the outstanding bonds		90.00%
Currency linked zero coupon exchangeable bonds maturing on July 7, 2026 [member] | Common Shares of Novatek [Member]
Disclosure of detailed information about bonds [Line Items]
Percentage of principal amount to redeem bonds on maturity date		96.92%
Exchange price per share | $ / shares								$ 709.2	$ 731.25

XML

Contents of Significant Accounts - Details of Long-term Loans (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 36,624,907		$ 33,066,106
Less: Current portion	(19,873,011)		(24,985,168)
Total	16,751,896	$ 603,889	8,080,938
Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 36,624,907		$ 33,066,106
Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rates applied	0.85%	0.85%	0.84%	0.55%
Top of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rates applied	4.66%	4.66%	4.67%	5.56%
Secured Long-Term Loan from Mega International Commercial Bank (1) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from July 3, 2017 to July 5, 2021 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Mega International Commercial Bank (1) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans			$ 1,640
Secured Long-Term Loan from Mega International Commercial Bank (2) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from October 24, 2019 to October 24, 2024 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Mega International Commercial Bank (2) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 14,598		19,464
Secured Long-Term Loan from Taiwan Cooperative Bank (1) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from October 19, 2015 to October 19, 2025 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (1) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 47,568		59,459
Secured Long-Term Loan from Taiwan Cooperative Bank (2) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable monthly from May 31, 2019 to May 31, 2023 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (2) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 13,125		21,146
Secured Long-Term Loan from Taiwan Cooperative Bank (3) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable monthly from August 13, 2020 to August 13, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (3) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 44,000		56,000
Secured Long-Term Loan from Taiwan Cooperative Bank (4) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable monthly from October 29, 2020 to August 29, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (4) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 22,759		28,965
Secured Long-Term Loan from Taiwan Cooperative Bank (5) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable monthly from April 15, 2021 to April 15, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (5) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 101,000
Secured Syndicated Loans from China Development Bank and 6 others (1) (Note A) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable semi-annually from October 20, 2016 to October 20, 2024 with semi-annually interest payments. Interest-only payment for the first and the second year.
Secured Syndicated Loans from China Development Bank and 6 others (1) (Note A) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 18,158,940		22,236,343
Secured Syndicated Loans from China Development Bank and 6 others (2) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable semi-annually from March 19, 2021 to March 18, 2031 with semi-annually interest payments. Interest-only payment for the first and the second year.
Secured Syndicated Loans from China Development Bank and 6 others (2) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 12,236,000
Secured Long-Term Loan from First Commercial Bank [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable monthly from December 2, 2021 to December 2, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from First Commercial Bank [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 47,000
Secured Long-Term Loan from KGI Bank [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable semi-annually from December 27, 2021 to December 27, 2026 with monthly interest payments. Interest-only payment for the first and the second year.
Secured Long-Term Loan from KGI Bank [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 21,000
Unsecured Long-Term Loan from ICBC Bank [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable semi-annually from September 20, 2019 to September 9, 2021 with quarterly interest payments. Interest-only payment for the first semi-annually year.
Unsecured Long-Term Loan from ICBC Bank [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans			1,702,589
Unsecured Long-Term Loan from Xiamen Bank [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable semi-annually from November 24, 2020 to May 24, 2022 of RMB 0.1 million with monthly interest payments and the remaining principal will be repaid once at maturity. Interest-only payment for the first semi-annually year.
Unsecured Long-Term Loan from Xiamen Bank [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 436,126		440,500
Unsecured Long-Term Loan from Bank of China [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable semi-annually from June 24, 2023 to June 24, 2026 with quarterly interest payments.
Unsecured Long-Term Loan from Bank of China [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 982,791
Unsecured Long-Term Loan from Bank of Taiwan (1) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from March 10, 2022 to December 10, 2024 with monthly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan (1) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 500,000		2,000,000
Unsecured Long-Term Loan from Bank of Taiwan (2) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from March 24, 2023 to March 24, 2025 with monthly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan (2) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 450,000
Unsecured Long-Term Loan from Taiwan Cooperative Bank [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from May 5, 2023 to May 5, 2025 with monthly interest payments.
Unsecured Long-Term Loan from Taiwan Cooperative Bank [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 0		2,000,000
Unsecured Revolving Loan from Mega International Commercial Bank (Note B) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable semi-annually from October 16, 2020 to April 16, 2022 with monthly interest payments.
Unsecured Revolving Loan from Mega International Commercial Bank (Note B) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 500,000		1,500,000
Unsecured Revolving Loan from Taipei Fubon Bank (Note C) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable annually from August 9, 2020 to August 9, 2023 with monthly interest payments.
Unsecured Revolving Loan from Taipei Fubon Bank (Note C) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 200,000		700,000
Unsecured Revolving Loan from Chang Hwa Commercial Bank (Note D) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from January 27, 2021 to October 27, 2022 with monthly interest payments.
Unsecured Revolving Loan from Chang Hwa Commercial Bank (Note D) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 550,000		1,000,000
Unsecured Revolving Loan from KGI Bank (1) (Note E) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable annually from December 11, 2021 to December 11, 2023 with monthly interest payments.
Unsecured Revolving Loan from KGI Bank (1) (Note E) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans			1,000,000
Unsecured Revolving Loan from KGI Bank (2) (Note E ) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable annually from August 10, 2023 to August 10, 2026 with monthly interest payments.
Unsecured Revolving Loan from KGI Bank (2) (Note E ) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 500,000
Unsecured Revolving Loan from First Commercial Bank (1) (Note F) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Settlement due on May 15, 2025 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (1) (Note F) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 0		$ 300,000
Unsecured Revolving Loan from First Commercial Bank (2) (Note G) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Settlement due on February 25, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (2) (Note G) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 300,000
Unsecured Revolving Loan from First Commercial Bank (3) (Note G) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Settlement due on March 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (3) (Note G) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 300,000
Unsecured Revolving Loan from First Commercial Bank (4) (Note G) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Settlement due on June 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (4) (Note G) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 200,000
Unsecured Revolving Loan from Yuanta Commercial Bank (Note H) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable annually from March 2, 2023 to March 2, 2026 with monthly interest payments.
Unsecured Revolving Loan from Yuanta Commercial Bank (Note H) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 1,000,000

XML

Contents of Significant Accounts - Long-Term Loans - Additional Information (Detail) ¥ in Millions, $ in Millions, $ in Millions	Mar. 03, 2021 TWD ($)	Jan. 18, 2021 TWD ($)	Dec. 30, 2019	Sep. 11, 2018 TWD ($)	Feb. 09, 2018 TWD ($)	Nov. 02, 2016 TWD ($)	Oct. 17, 2016 TWD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CNY (¥)	May 10, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CNY (¥)
Unsecured Revolving Loan [Member]
Disclosure of detailed information about borrowings [line items]
Debt maturity period		1-year	1-year
Debt maximum borrowing capacity		$ 2,000
Unused line of credit								$ 1,200
Secured syndicated loans from China development bank [member]
Disclosure of detailed information about borrowings [line items]
Endorsement								14,566				$ 10,350
Secured syndicated loans from China development bank [member] | HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member]
Disclosure of detailed information about borrowings [line items]
Endorsement								6,438				4,564
Secured syndicated loans from China development bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Endorsement									$ 290	¥ 2,050			$ 371	¥ 1,970
Secured syndicated loans from China development bank [member] | Top of range [member] | HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member]
Disclosure of detailed information about borrowings [line items]
Endorsement								7,450				8,362
Mega International Commercial Bank [Member] | Unsecured Revolving Loan [Member]
Disclosure of detailed information about borrowings [line items]
Debt maturity period							5-year
Debt maximum borrowing capacity							$ 3,000
Chang Hwa Commercial Bank [member] | Unsecured Revolving Loan [Member]
Disclosure of detailed information about borrowings [line items]
Debt maturity period						5-year
Debt maximum borrowing capacity						$ 3,000
Unused line of credit								800				1,700
Taipei Fubon Bank [Member] | Unsecured Revolving Loan [Member]
Disclosure of detailed information about borrowings [line items]
Debt maturity period					5-year
Debt maximum borrowing capacity					$ 2,000
Unused line of credit								800				800
KGI Commercial Bank [Member] | Unsecured Revolving Loan [Member]
Disclosure of detailed information about borrowings [line items]
Debt maturity period				5-year
Debt maximum borrowing capacity				$ 2,500							$ 3,000
Unused line of credit								2,500				$ 1,000
Yuanta Commercial Bank [Member] | Unsecured Revolving Loan [Member]
Disclosure of detailed information about borrowings [line items]
Debt maturity period	5-year
Debt maximum borrowing capacity	$ 4,000
Unused line of credit								$ 3,000

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Contents of Significant Accounts - Post-Employment Benefits - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of defined benefit plans and defined contribution plans [Line Items]
Actual returns on plan assets	$ 26	$ 61
Expected pension fund contribution in 2022	$ 697
Weighted-average durations of defined benefit obligation	8 years	9 years
Defined benefit plan [member]
Disclosure of defined benefit plans and defined contribution plans [Line Items]
Percentages of employees' total monthly salaries and wages to pension fund	2.00%	2.00%	2.00%
Pension expenses	$ 23	$ 40	$ 59
Defined contribution plan [member]
Disclosure of defined benefit plans and defined contribution plans [Line Items]
Minimum percentage of employees' monthly salary or wages as monthly contributions to defined contribution plan	6.00%	6.00%	6.00%
Pension expenses	$ 1,636	$ 1,478	$ 1,369

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Contents of Significant Accounts - Movements in Present Value of Defined Benefit Obligation and Fair Value of Plan Assets (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Present value of defined benefit obligation [member]
Disclosure of net defined benefit liability (asset) [line items]
Beginning balance	$ (5,561,999)	$ (5,411,069)
Service cost	(11,009)	(13,090)
Interest income (cost)	(16,130)	(36,254)
Subtotal	(27,139)	(49,344)
Arising from changes in demographic assumptions	(4,537)
Arising from changes in financial assumptions	(123,140)	(173,615)
Experience adjustments	(91,268)	(70,461)
Subtotal	(218,945)	(244,076)
Benefits paid	349,750	142,490
Ending balance	(5,458,333)	(5,561,999)
Plan assets [member]
Disclosure of net defined benefit liability (asset) [line items]
Beginning balance	1,399,345	1,385,696
Interest income (cost)	4,059	9,284
Contribution by employer	505,890	95,360
Benefits paid	(349,750)	(142,490)
Return on plan assets, excluding amounts included in interest income	21,468	51,495
Ending balance	$ 1,581,012	$ 1,399,345

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Contents of Significant Accounts - Defined Benefit Plan Recognized on the Consolidated Balance Sheets (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure Of Defined Benefit Plans [Abstract]
Present value of the defined benefit obligation	$ (5,458,333)		$ (5,561,999)
Fair value of plan assets	1,581,012		1,399,345
Funded status	(3,877,321)		(4,162,654)
Net defined benefit liabilities, noncurrent recognized on the consolidated balance sheets	$ (3,877,321)	$ (139,774)	$ (4,162,654)

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Contents of Significant Accounts - Major Categories of Plan Assets as a Percentage of Fair Value of the Total Plan Assets (Detail)	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Fair Value Of Plan Assets [Abstract]
Cash	24.00%	16.00%
Equity instruments	43.00%	48.00%
Debt instruments	23.00%	25.00%
Others	10.00%	11.00%

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Contents of Significant Accounts - Principal Underlying Actuarial Assumptions (Detail)	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Defined Benefit Plans [Abstract]
Discount rate	0.62%	0.29%
Rate of future salary increase	4.25%	3.50%

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Contents of Significant Accounts - Expected Future Benefit Payments (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)
Disclosure of defined benefit plans [line items]
Expected future benefit payments	$ 5,733,803
Not later than one year [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	373,879
Later than one year and not later than two years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	373,406
Later than two years and not later than three years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	397,426
Later than three years and not later than four years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	432,167
Later than four years and not later than five years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	435,179
Later than five years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	$ 3,721,746

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Contents of Significant Accounts - Sensitivity Analysis (Detail) - TWD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Decrease (increase) in defined benefit obligation due to 0.5% increase in actuarial assumptions	$ 207,999	$ 226,798
Decrease (increase) in defined benefit obligation due to 0.5% decrease in actuarial assumptions	$ (220,561)
Percentage increase in actuarial assumptions	0.50%	0.50%
Percentage decrease in actuarial assumptions	0.50%	0.50%
Rate of future salary increase [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Decrease (increase) in defined benefit obligation due to 0.5% increase in actuarial assumptions	$ (184,551)	$ (204,390)
Decrease (increase) in defined benefit obligation due to 0.5% decrease in actuarial assumptions	$ 176,567	$ 195,078
Percentage increase in actuarial assumptions	0.50%	0.50%
Percentage decrease in actuarial assumptions	0.50%	0.50%

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Contents of Significant Accounts - Deferred Government Grants (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Miscellaneous Liabilities [Abstract]
Beginning balance	$ 10,207,109		$ 13,551,553
Arising during the period	2,498,990		578,844
Other operating income	(4,069,055)	$ (146,685)	(3,994,818)	$ (4,062,148)
Exchange effect	(93,246)		71,530
Ending balance	8,543,798		10,207,109	13,551,553
Current (classified under other current liabilities)	4,096,742		3,836,211
Non-current (classified under other noncurrent liabilities)	4,447,056		6,370,898
Total	$ 8,543,798		$ 10,207,109	$ 13,551,553

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Contents of Significant Accounts - Refund Liabilities - Summary of Refund Liabilities (Detail) - TWD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Refund Liability [Abstract]
Refund liabilities	$ 724,207	$ 1,252,451

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Contents of Significant Accounts - Equity - Additional Information (Detail) $ / shares in Units, $ in Millions						12 Months Ended
	Feb. 24, 2022 TWD ($) $ / shares	Nov. 05, 2021 $ / shares shares	Sep. 03, 2021 shares	Jun. 09, 2021 shares $ / shares	Sep. 01, 2020 shares $ / shares	Dec. 31, 2021 shares $ / shares	Dec. 31, 2020 $ / shares shares
Disclosure of classes of share capital [line items]
Shares authorized						26,000,000,000	26,000,000,000
Shares issued						12,483,248,000	12,422,402,000
Shares par value | $ / shares						$ 10	$ 10
Number of common shares represented by 1 ADS						5
Maximum percentage of total shares of treasury stock on issued stock as per Securities and Exchange Law of the R.O.C						10.00%
Closing prices of UMC's stock | $ / shares						$ 65.00	47.15
Proposed cash distribution from additional paid-in capital | $ / shares	$ 3.00
Percentage of legal reserve						10.00%
Cash dividends | $ / shares							$ 1.59988820
Proposed cash distribution from additional paid in capital | $	$ 37,446
ChipBond Technology Corporation [Member]
Disclosure of classes of share capital [line items]
Shares par value | $ / shares		$ 10
Shares issued due to share exchange transaction		61,000,000
Number of shares exchanged in		53,000,000
HSUN CHIEH INVESTMENT CO., LTD. [member]
Disclosure of classes of share capital [line items]
Number of shares in entity held by its subsidiaries or associates						441,000,000	441,000,000
YANN YUAN INVESTMENT CO., LTD. [member]
Disclosure of classes of share capital [line items]
Number of shares in entity held by its subsidiaries or associates						160,000,000	201,000,000
Fortune Venture Capital Corp [member] | ChipBond Technology Corporation [Member]
Disclosure of classes of share capital [line items]
Number of shares exchanged out			16,000,000
Number of shares exchanged in		14,000,000	14,000,000
American depositary shares [member]
Disclosure of classes of share capital [line items]
Number of American Depositary Shares traded on NYSE						149,000,000	127,000,000
Number of common shares represented by issued American Depositary Shares						746,000,000	636,000,000
Bottom of range [member]
Disclosure of classes of share capital [line items]
Percentage of cash dividend on dividend distribution						20.00%
Percentage of stock dividend on dividend distribution						0.00%
Top of range [member]
Disclosure of classes of share capital [line items]
Percentage of cash dividend on dividend distribution						100.00%
Percentage of stock dividend on dividend distribution						80.00%
Restricted Stocks [Member]
Disclosure of classes of share capital [line items]
Shares par value | $ / shares				$ 10	$ 10
Number of other equity instruments granted in share-based payment arrangement				1,000,000	200,000,000
Number of other equity instruments forfeited in share-based payment arrangement						2,000,000

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Contents of Significant Accounts - Purpose for Repurchase and Changes in Treasury Stock (Detail) - Transfer to employees [member] shares in Thousands	12 Months Ended
	Dec. 31, 2020 shares
Disclosure of classes of share capital [line items]
Beginning balance	0
Increase	105,000
Decrease	105,000
Ending balance	0

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Contents of Significant Accounts - Details of Distribution (Detail) - TWD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of equity [Line Items]
Appropriation of earnings, Cash dividends	$ 19,875,842	$ 9,765,155	$ 6,916,105
Cash dividends	$ 0	$ 1.60
Legal Reserve [Member]
Disclosure of equity [Line Items]
Appropriation of earnings	$ 5,832,570	$ 3,197,890
Special Reserve [member]
Disclosure of equity [Line Items]
Appropriation of earnings	(3,250,434)	(2,857,666)
Cash dividends [member]
Disclosure of equity [Line Items]
Appropriation of earnings, Cash dividends	$ 0	$ 19,875,842

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Contents of Significant Accounts - Non-controlling Interests (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Equity [abstract]
Beginning balance	$ 113,356		$ 410,065	$ 466,768
Net loss	(668,245)	$ (24,090)	(2,009,077)	(3,578,847)
Other comprehensive income (loss)	(19)		126,653	(15,213)
Disposal of a subsidiary	0		(51,565)
The differences between the fair value of the consideration paid or received from acquiring or disposing subsidiaries and the carrying amounts of the subsidiaries	0		106,879
Changes in subsidiaries' ownership	(11,126)		(10,331)	24,740
Non-Controlling Interests	23,430		(551,608)
Derecognition of the non-controlling interests	765,785		2,092,340	3,512,617
Ending balance	$ 223,181	$ 8,045	$ 113,356	$ 410,065

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Contents of Significant Accounts - Share-Based Payment - Additional Information (Detail) $ / shares in Units, shares in Millions, Right in Millions, $ in Millions						1 Months Ended			12 Months Ended
	Jun. 30, 2021	Jun. 09, 2021 $ / shares shares	Sep. 30, 2020	Sep. 01, 2020 $ / shares shares	Jun. 10, 2020 shares	Jun. 30, 2021 Right	Sep. 30, 2020 Right $ / shares shares	Aug. 31, 2018 $ / shares shares	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Treasury Stock Plan For Employees In 2020 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of treasury shares to employees | shares | shares							105
Grant date quoted market price per share | $ / shares | $ / shares							$ 21.45
Vesting period							1 year
Compensation expenses | $									$ 226	$ 348
Treasury Stock Plan For Employees In 2018 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of treasury shares to employees | shares | shares								200
Grant date quoted market price per share | $ / shares | $ / shares								$ 16.95
Compensation expenses | $										107	$ 366
Restricted Stock Plan For Employees [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Compensation expenses | $									$ 1,520	504
Compensation plan description									The Company is authorized to issue restricted stocks in one tranche or in installments, under the custody of trust institution, within one year from the date of receiving the effective registration from the competent authority.
Eligibility terms to vested restricted stocks									Beginning from the end of two years since the date of grant, those employees who fulfill both service period and performance conditions set by the Company are gradually eligible to the vested restricted stocks at certain percentage and time frame.
Maximum shares to be issued under compensation plan | shares | shares					233
Shares of restricted stock for employees issued | shares | shares		1		200
Life of plan		4 years		4 years
Grant date quoted market price per share | $ / shares | $ / shares		$ 53.0		$ 21.8
Stock Appreciation Right Plan For Employees [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Compensation expenses | $									$ 271	80
Stock Appreciation Right Plan For Employees Description									One unit of stock appreciation right to employees represents a right to the intrinsic value of one common share of UMC.
Life of plan	4 years		4 years
Liabilities for stock appreciation right recognized									$ 352	$ 81
Unit of cash-settled stock appreciation right | Right						1	26
Bottom of range [member] | Treasury Stock Plan For Employees In 2018 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period								1 year
Top of range [member] | Treasury Stock Plan For Employees In 2018 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period								2 years

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Contents of Significant Accounts - Summary of Assumptions Used for Compensation Cost for Cash-settled Share-based Payment Measured at Fair Value on Grant Date by using Black-Scholes Option Pricing Model (Detail) - Stock Appreciation Right Plan For Employees [Member]	12 Months Ended
	Dec. 31, 2021 yr $ / shares
Granted in September 2020 [Member]
Statement [Line Items]
Share price of measurement date (NT$/ per share) | $ / shares	$ 65.00
Expected dividend yield	5.27%
Granted in June 2021 [Member]
Statement [Line Items]
Share price of measurement date (NT$/ per share) | $ / shares	$ 65.00
Expected dividend yield	5.27%
Bottom of range [member] | Granted in September 2020 [Member]
Statement [Line Items]
Expected volatility	40.11%
Expected life	0.67
Risk-free interest rate	0.32%
Bottom of range [member] | Granted in June 2021 [Member]
Statement [Line Items]
Expected volatility	38.52%
Expected life	1.44
Risk-free interest rate	0.38%
Top of range [member] | Granted in September 2020 [Member]
Statement [Line Items]
Expected volatility	42.88%
Expected life	2.67
Risk-free interest rate	0.46%
Top of range [member] | Granted in June 2021 [Member]
Statement [Line Items]
Expected volatility	47.75%
Expected life	3.44
Risk-free interest rate	0.50%

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Contents of Significant Accounts - Summary of Disaggregation of Revenue by Geography (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	$ 213,011,018	$ 176,820,914	$ 148,201,641
Taiwan [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	80,655,096	65,003,509	53,966,435
Singapore [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	29,068,748	26,054,856	23,979,343
China (includes Hong Kong) [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	31,176,136	22,629,388	19,115,188
Japan [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	13,705,192	15,363,352	9,855,772
USA [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	24,270,210	24,546,963	19,957,615
Europe [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	5,628,998	6,416,235	6,900,339
Others [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	$ 28,506,638	$ 16,806,611	$ 14,426,949

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Contents of Significant Accounts - Summary of Disaggregation of Revenue by Product (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Products [Line Items]
Revenue from contracts with customers	$ 213,011,018	$ 176,820,914	$ 148,201,641
Wafer [member]
Disclosure Of Products [Line Items]
Revenue from contracts with customers	204,594,399	169,885,201	142,625,019
Other products [member]
Disclosure Of Products [Line Items]
Revenue from contracts with customers	$ 8,416,619	$ 6,935,713	$ 5,576,622

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Contents of Significant Accounts - Summary of Disaggregation of Revenue by The Timing of Revenue Recognition (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 213,011,018	$ 176,820,914	$ 148,201,641
Goods or services transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	211,074,982	174,492,036	147,057,035
Goods or services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 1,936,036	$ 2,328,878	$ 1,144,606

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Contents of Significant Accounts - Summary of Balances of Contract Assets and Contract Liabilities (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Jan. 01, 2020 TWD ($)
Disclosure of balances of contract assets and contract liabilities [line items]
Contract assets, current	$ 319,621	$ 11,522	$ 257,841	$ 214,243
Contract liabilities, current	3,441,754	124,072	2,040,989	988,115
Contract liabilities, non-current	641,386	$ 23,121	456,480	482,080
Contract liabilities	4,083,140		2,497,469	1,470,195
Sales of Goods and Services [member]
Disclosure of balances of contract assets and contract liabilities [line items]
Contract assets, current	677,326		625,222	599,491
Contract liabilities	4,083,140		2,497,469	1,470,195
Loss allowance [member]
Disclosure of balances of contract assets and contract liabilities [line items]
Contract assets, current	$ (357,705)		$ (367,381)	$ (385,248)

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Contents of Significant Accounts - Operating Revenues - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of additional information about revenue [Abstract]
Revenue that was included in contract liability balance at beginning of period	$ 1,416	$ 706
Transaction price allocated to unsatisfied performance obligations	167	2,759
Asset recognized from the cost to fulfill a contract with customer	$ 612	$ 549

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Contents of Significant Accounts - Operating Costs and Expenses (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure Of Operating Costs And Expenses [Line Items]
Salaries	$ 35,195,095		$ 29,779,476	$ 24,822,224
Labor and health insurance	1,641,494		1,514,696	1,306,608
Pension	1,658,923		1,517,727	1,428,158
Other employee benefit expenses	480,497		396,696	427,989
Depreciation	43,911,464		45,895,958	46,910,627
Amortization	2,894,942	$ 104,360	2,744,383	2,216,654
Operating costs [member]
Disclosure Of Operating Costs And Expenses [Line Items]
Salaries	23,388,888		20,367,325	17,109,432
Labor and health insurance	1,183,315		1,061,848	911,037
Pension	1,259,044		1,138,429	1,066,877
Other employee benefit expenses	335,829		274,838	303,358
Depreciation	42,002,745		43,969,732	45,068,673
Amortization	834,384		895,732	848,214
Operating expenses [member]
Disclosure Of Operating Costs And Expenses [Line Items]
Salaries	11,806,207		9,412,151	7,712,792
Labor and health insurance	458,179		452,848	395,571
Pension	399,879		379,298	361,281
Other employee benefit expenses	144,668		121,858	124,631
Depreciation	1,908,719		1,926,226	1,841,954
Amortization	$ 2,060,558		$ 1,848,651	$ 1,368,440

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Contents of Significant Accounts - Operating Costs and Expenses - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021
Bottom of range [member]
Disclosure Of Operating Costs And Expenses [Line Items]
Allocated profit percentage for employees' compensation	5.00%
Top of range [member]
Disclosure Of Operating Costs And Expenses [Line Items]
Allocated profit percentage for directors' compensation	0.20%

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Contents of Significant Accounts - Details of Distribution of Employees' Compensation and Directors' Compensation (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Analysis of income and expense [abstract]
Employees' compensation - Cash	$ 4,770,909	$ 2,581,675	$ 1,132,952
Directors' compensation	$ 25,264	$ 32,369	$ 10,259

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Contents of Significant Accounts - Net Other Operating Income and Expenses (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Analysis of income and expense [abstract]
Government grants	$ 5,269,412		$ 5,179,643	$ 5,366,907
Rental income from property, plant and equipment	187,166		198,860	200,351
Gain on disposal of property, plant and equipment	143,735	$ 5,182	1,137,320	43,036
Impairment loss
Property, plant and equipment	0			(84,974)
Goodwill	0			(7,398)
Others	(373,482)		(261,933)	(335,760)
Total	$ 5,226,831	$ 188,422	$ 6,253,890	$ 5,182,162

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Contents of Significant Accounts - Non-Operating Income and Expenses (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on valuation of financial assets and liabilities at fair value through profit or loss	$ 2,892,470		$ 2,011,403	$ 1,279,931
Gain (loss) on disposal of investments	(16,388)	$ (591)	(91,070)	(16,293)
Others	(2,009,952)		(1,871,567)	(71,147)
Total other gains and losses	866,130	31,223	48,766	1,166,729
Interest expenses, bonds payable	437,055		377,193	672,902
Interest expenses, bank loans	1,285,708		1,417,028	1,808,633
Interest expenses,lease liabilities	145,187		154,730	178,112
Interest expenses, others	139		55,467	274,168
Financial expenses	94,841		69,015	63,828
Total finance costs	1,962,930	$ 70,762	$ 2,073,433	2,997,643
Investments accounted for under the equity method [Member]
Disclosure of detailed information about financial instruments [line items]
Impairment loss	$ 0			$ (25,762)

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Contents of Significant Accounts - Components of Other Comprehensive Income (Loss) (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Statement of changes in equity [abstract]
Remeasurements of defined benefit pension plans , Arising during the period	$ (197,477)	$ (7,119)	$ (192,581)	$ 106,403
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income	5,811,342	209,493	4,815,361	5,486,209
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Arising during the period	2,959,130	106,674	883,508	899,025
Exchange differences on translation of foreign operations, Arising during the period	(4,743,299)		(2,917,361)	(3,292,023)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Arising during the period	(24,018)		37,474	8,799
Total other comprehensive income (loss), Arising during the period	3,805,678		2,626,401	3,208,413
Exchange differences on translation of foreign operations, Reclassification adjustments during the period	2,283		(2,919)	14,085
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Reclassification adjustments during the period	(394)		22,843	6,594
Total other comprehensive income (loss), Reclassification adjustments during the period	1,889		19,924	20,679
Remeasurements of defined benefit pension plans, Before tax	(197,477)	(7,119)	(192,581)	106,403
nrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Before tax	5,811,342		4,815,361	5,486,209
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Before tax	2,959,130	106,674	883,508	899,025
Exchange differences on translation of foreign operations, Before tax	(4,741,016)	(170,909)	(2,920,280)	(3,277,938)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Before tax	(24,412)	(880)	60,317	15,393
Total other comprehensive income (loss), Before tax	3,807,567		2,646,325	3,229,092
Remeasurements of defined benefit pension plans, Income tax effect	39,495		38,516	(21,281)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Income tax effect	(360,061)		(134,887)	(394,695)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Income tax effect	(96,510)		(115,048)	(41,643)
Exchange differences on translation of foreign operations, Income tax effect	23,175		38,541	14,949
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Income tax effect	6,763		7,372	(8,843)
Total other comprehensive income (loss), Income tax effect	(387,138)		(165,506)	(451,513)
Remeasurements of defined benefit pension plans, Net of tax	(157,982)		(154,065)	85,122
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Net of tax	5,451,281		4,680,474	5,091,514
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Net of tax	2,862,620		768,460	857,382
Exchange differences on translation of foreign operations, Net of tax	(4,717,841)		(2,881,739)	(3,262,989)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Net of tax	(17,649)		67,689	6,550
Total other comprehensive income, net of tax	$ 3,420,429	$ 123,303	$ 2,480,819	$ 2,777,579

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Contents of Significant Accounts - Major Components of Income Tax Expense (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Current income tax expense (benefit):
Current income tax charge	$ 7,088,975		$ 2,346,937	$ 772,795
Adjustments in respect of current income tax of prior periods	(150,260)		(1,140,060)	(1,033,780)
Deferred income tax expense (benefit):
Deferred income tax related to origination and reversal of temporary differences	407,280		49,035	465,530
Deferred income tax related to recognition and derecognition of tax losses and unused tax credits	723,270		683,080	231,971
Adjustment of prior year's deferred income tax	(130,841)		(246,173)	121,189
Deferred income tax arising from write-down or reversal of write-down of deferred tax assets	(20,172)		(1,736)	(327,359)
Income tax expense recorded in profit or loss	7,918,252	$ 285,445	1,691,083	230,346
Income tax related to components of other comprehensive income (loss), Items that will not be reclassified subsequently to profit or loss
Remeasurements of defined benefit pension plans	39,495		38,516	(21,281)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income	(360,061)		(134,887)	(394,695)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss	(96,510)		(115,048)	(41,643)
Income tax related to items that will not be reclassified subsequently to profit or loss	(417,076)	(15,035)	(211,419)	(457,619)
Income tax related to components of other comprehensive income (loss), Items that may be reclassified subsequently to profit or loss
Exchange differences on translation of foreign operations	23,175		38,541	14,949
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss	6,763		7,372	(8,843)
Income tax related to items that may be reclassified subsequently to profit or loss	29,938	$ 1,079	45,913	6,106
Deferred income tax recognized directly to equity
Disposal of parent company's stock by subsidiary recognized as treasury stock transactions	(203)
Adjustments of changes in net assets of associates and joint ventures accounted for using equity method	22		(91)	(532)
Recognize (reversal) of temporary difference arising from initial recognition of the equity component of the compound financial instrument			3,691	(45)
Gains or losses on hedging instruments which will not be reclassified subsequently to profit or loss				(514)
Income tax charged directly to equity	$ (181)		$ 3,600	$ (1,091)

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Contents of Significant Accounts - Reconciliation Between Income Tax Expense and Income Before Tax At UMC's Applicable Tax Rate (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Income before tax	$ 58,496,432	$ 2,108,739	$ 22,542,750	$ 4,806,596
At UMC's statutory income tax rate	11,699,286		4,508,550	961,319
Adjustments in respect of current income tax of prior periods	(150,260)		(1,140,060)	(1,033,780)
Net changes in loss carry-forward and investment tax credits	(845,267)		447,570	2,387,922
Adjustment of deferred tax assets/liabilities for write-downs/reversals and different jurisdictional tax rates	183,123		(505,537)	(169,568)
Tax effect of non-taxable income and non-deductible expenses:
Tax exempt income	(3,258,695)		(2,500,688)	(1,778,820)
Investment gain	(1,388,877)		(431,501)	(270,610)
Dividend income	(171,725)		(130,672)	(139,093)
Others	6,463		32,268	110,991
Basic tax	0		2,803	3,215
Estimated income tax on unappropriated earnings	1,558,031		1,087,216	150,401
Effect of different tax rates applicable to UMC and its subsidiaries	116,174		(191,687)	(102,608)
Taxes withheld in other jurisdictions	43,443		25,193	19,749
Others	126,556		487,628	91,228
Income tax expense recorded in profit or loses	$ 7,918,252	$ 285,445	$ 1,691,083	$ 230,346

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Contents of Significant Accounts - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	$ 5,478,269	$ 197,486	$ 6,665,976
Deferred income tax liabilities	(2,323,917)	$ (83,775)	(1,965,108)
Net deferred income tax assets	3,154,352		4,700,868	$ 5,342,127
Depreciation [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	2,155,961		2,116,855
Deferred income tax liabilities	(78,792)		(156,000)
Loss carry-forward [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	62,367		685,531
Defined benefit plan [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	770,847		828,410
Refund liabilities [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	140,861		240,165
Allowance for inventory valuation losses [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	433,630		595,910
Investment loss [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	349,794		389,743
Unrealized profit on intercompany sales [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	1,125,370		1,348,202
Others [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	439,439		461,160
Deferred income tax liabilities	0		(687)
Unrealized exchange gain (losses) [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax liabilities	(580,191)		(559,334)
Investment gain [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax liabilities	(1,354,740)		(933,038)
Bonds [Member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax liabilities	(6,353)
Amortizable assets [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax liabilities	$ (303,841)		$ (316,049)

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Contents of Significant Accounts - Movement of Deferred Tax (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in deferred tax assets and liabilities [Line Items]
Beginning Balance	$ 4,700,868	$ 5,342,127
Amounts recognized in profit or loss during the period	(979,537)	(484,206)
Amounts recognized in other comprehensive income (loss)	(387,138)	(165,506)	$ (451,513)
Amounts recognized in equity	22	3,600
Exchange adjustments	(179,863)	4,853
Ending Balance	$ 3,154,352	$ 4,700,868	$ 5,342,127

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Contents of Significant Accounts - Unused Tax Loss Carry-forward for Which No Deferred Income Tax Assets have been Recognized (Detail) - TWD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry-forward for which no deferred income tax assets have been recognized	$ 41,292,987	$ 43,584,701
1-5 years [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry-forward for which no deferred income tax assets have been recognized	38,562,420	40,910,279
6-10 years [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry-forward for which no deferred income tax assets have been recognized	$ 2,730,567	$ 2,674,422

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Contents of Significant Accounts - Income Tax - Additional Information (Detail) - TWD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]
Deductible temporary differences for which no deferred income tax assets have been recognized	$ 4,433	$ 2,942
Taxable temporary differences of unrecognized deferred tax liabilities associated with investments in subsidiaries	$ 14,904	$ 11,463

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Contents of Significant Accounts - Earnings Per Share (Detail) $ / shares in Units, $ / shares in Units, shares in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 TWD ($) $ / shares shares	Dec. 31, 2019 TWD ($) $ / shares shares
Earnings per share-basic
Net income attributable to the parent company	$ 51,246,425	$ 1,847,384	$ 22,860,744	$ 8,155,097
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)	12,005,126	12,005,126	11,850,052	11,565,068
Earnings per share-basic (NTD) | (per share)	$ 4.27	$ 0.15	$ 1.93	$ 0.71
Earnings per share-diluted
Net income attributable to the parent company	$ 51,246,425	$ 1,847,384	$ 22,860,744	$ 8,155,097
Effect of dilution
Unsecured convertible bonds | $	0		69,019	289,121
Income attributable to shareholders of the parent | $	$ 51,246,425		$ 22,929,763	$ 8,444,218
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)	12,005,126	12,005,126	11,850,052	11,565,068
Effect of dilution
Restricted stocks for employees	159,478	159,478	30,911
Employees' compensation	80,243	80,243	65,657	90,047
Unsecured convertible bonds	0	0	303,630	1,295,729
Weighted-average number of ordinary shares after dilution (thousand shares)	12,244,847	12,244,847	12,250,250	12,950,844
Earnings per share-diluted (NTD) | (per share)	$ 4.19	$ 0.15	$ 1.87	$ 0.65

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Contents of Significant Accounts - Reconciliation of Liabilities Arising from Financing Activities (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-term borrowings [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	$ 11,057,132	$ 12,015,206	$ 13,103,808
Cash Flows	(8,974,216)	(933,392)	(993,723)
Non-cash changes,Foreign exchange	(158,792)	(75,751)	(368,507)
Non-cash changes,Other		51,069	273,628
Ending Balance	1,924,124	11,057,132	12,015,206
Long-term loans [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	33,066,106	33,902,074	30,826,215
Cash Flows	4,088,537	136,920	3,876,991
Non-cash changes,Foreign exchange	(529,736)	(972,888)	(802,975)
Non-cash changes,Other			1,843
Ending Balance	36,624,907	33,066,106	33,902,074
Bonds payable [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	18,690,384	38,781,416	41,378,182
Cash Flows	23,703,692	(13,702,875)	(2,500,000)
Non-cash changes,Other	(1,857,418)	(6,388,157)	(96,766)
Ending Balance	40,536,658	18,690,384	38,781,416
Guarantee deposits [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	235,992	296,694	665,793
Cash Flows	14,219,408	(59,819)	252,269
Non-cash changes,Foreign exchange	(85,631)	(883)	(2,021)
Non-cash changes,Other			(619,347)
Ending Balance	14,369,769	235,992	296,694
Lease liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	5,576,864	6,031,025	6,006,457
Cash Flows	(699,680)	(726,626)	(633,488)
Non-cash changes,Foreign exchange	(144,419)	(10,036)	(78,432)
Non-cash changes,Other	335,989	282,501	736,488
Ending Balance	5,068,754	5,576,864	6,031,025
Other financial liabilities - noncurrent [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	20,746,624	20,093,441	20,410,355
Non-cash changes,Foreign exchange	(163,387)	281,219	(698,127)
Non-cash changes,Other	382,972	371,964	381,213
Ending Balance	$ 20,966,209	$ 20,746,624	$ 20,093,441

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Contents of Significant Accounts - Business Combinations - Additional Information (Detail) $ in Millions, ¥ in Billions		12 Months Ended
	Oct. 01, 2019 TWD ($)	Dec. 31, 2019 TWD ($)	Oct. 01, 2019 JPY (¥)
MIE FUJITSU SEMICONDUCTOR LIMITED (MIFS) [member]
Disclosure of detailed information about business combination [line items]
Percentage of equity interest acquired			84.10%
Percentage of equity interest previously held			15.90%
Cash Consideration of Business Combination | ¥			¥ 54.4
UNITED SEMICONDUCTOR JAPAN CO LTD (USJC) [member]
Disclosure of detailed information about business combination [line items]
Percentage of equity interest previously held			15.90%
Gain (loss) on disposal of equity method	$ (375)
Operating Revenue of Business acquisition		$ 4,277
Profit before tax From operations		305
Operating Revenue of Business acquisition		160,767
Profit before tax From operations		$ 5,606

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Contents of Significant Accounts - Summary of Derecognized Assets and Liabilities (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Assets
Cash and cash equivalents	$ 132,622,131	$ 4,780,899	$ 94,048,036	$ 3,390,340	$ 95,492,477	$ 83,661,739
Others	1,815,752	65,456	1,501,933
Total assets	450,955,341	16,256,501	366,454,101
Liabilities
Payables	(21,417,215)	(772,070)	(17,877,736)
Liabilities	(186,580,294)	$ (6,726,038)	$ (143,314,539)
NEXPOWER TECHNOLOGY CORP. (NEXPOWER) [member]
Assets
Cash and cash equivalents	776,586
Others	18
Total assets	776,604
Liabilities
Payables	(194)
Liabilities	(194)
Net assets of the deconsolidation	$ 776,410

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Contents of Significant Accounts - Summary of Consideration Received and Gain Recognized (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Consideration Received And Loss Recognized From Transaction [Line Items]
Add: Non-controlling interests	$ 223,181	$ 8,045	$ 113,356	$ 410,065	$ 466,768
NEXPOWER TECHNOLOGY CORP. (NEXPOWER) [member]
Consideration Received And Loss Recognized From Transaction [Line Items]
Cash received	722,559
Less: Net assets of the deconsolidation	(776,410)
Add: Non-controlling interests	51,565
Other comprehensive income from equity reclassified to profit or loss due to derecognition	4,061
Gain on deconsolidation (Note A)	$ 1,775

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Contents of Significant Accounts - Summary of Net Cash Outflow Arising from Deconsolidation of the Subsidiary (Detail) - Nexpower Technology Corp [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)
Net Cash Outflow Arising From Deconsolidation Of Subsidiary [Line Items]
Cash received	$ 722,559
Net cash of subsidiary derecognized	(776,586)
Net cash outflow from deconsolidation	$ (54,027)

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Significant Related Party Transactions - Significant Intercompany Transactions Between Consolidated Entities (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 USD ($)
Disclosure of transactions between related parties [line items]
Amount of downstream transaction		$ 350		$ 350		$ 350
UMC GROUP (USA) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 48,440,369		$ 49,357,981		$ 47,736,335
Accounts receivable	$ 6,286,428		$ 5,388,172		$ 5,937,706
Explanation of terms and conditions of outstanding balances for related party transaction	Net 60 days	Net 60 days	Net 60 days	Net 60 days	Net 60 days	Net 60 days
UMC GROUP JAPAN [member]
Disclosure of transactions between related parties [line items]
Sales			$ 1,220,419		$ 3,933,964
Accounts receivable					$ 608,622
Explanation of terms and conditions of outstanding balances for related party transaction			Net 60 days	Net 60 days	Net 60 days	Net 60 days
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member]
Disclosure of transactions between related parties [line items]
Accounts receivable	$ 29,012		$ 24,831		$ 31,334
Royalty	$ 1,222,320		$ 1,183,180		$ 1,209,310
Explanation of terms and conditions of outstanding balances for related party transaction	Net 30 days	Net 30 days	Net 30 days	Net 30 days	Net 30 days	Net 30 days
Loan receivable					$ 1,201,200
UDS [Member]
Disclosure of transactions between related parties [line items]
Sales	$ 178,331
Accounts receivable	$ 18,818
Explanation of terms and conditions of outstanding balances for related party transaction	Net 30 days	Net 30 days
WAVETEK MICROELECTRONICS CORPORATION (WAVETEK) [member] | UMC GROUP (USA) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 545,785
Accounts receivable	$ 126,580
Explanation of terms and conditions of outstanding balances for related party transaction	Net 60 days	Net 60 days
WAVETEK MICROELECTRONICS CORPORATION (WAVETEK) [member] | UMC [Member]
Disclosure of transactions between related parties [line items]
Sales	$ 110,620
Explanation of terms and conditions of outstanding balances for related party transaction	Month-end 30 days	Month-end 30 days
HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member] | UMC GROUP (USA) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 366,968		$ 137,860		152,012
Accounts receivable	$ 60,147		$ 33,069		$ 21,138
Explanation of terms and conditions of outstanding balances for related party transaction	Net 60 days	Net 60 days	Net 60 days	Net 60 days	Net 60 days	Net 60 days
HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member] | UMC GROUP JAPAN [member]
Disclosure of transactions between related parties [line items]
Sales			$ 106,077		$ 250,736
Accounts receivable					$ 51,150
Explanation of terms and conditions of outstanding balances for related party transaction			Net 60 days	Net 60 days	Net 60 days	Net 60 days
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member] | UMC GROUP (USA) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 1,444,736		$ 970,358		$ 745,226
Accounts receivable	$ 221,375		$ 250,092		$ 33,242
Explanation of terms and conditions of outstanding balances for related party transaction	Net 60 days	Net 60 days	Net 60 days	Net 60 days	Net 60 days	Net 60 days
UNITED SEMICONDUCTOR JAPAN CO LTD (USJC) [member] | UMC GROUP (USA) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 2,917,993		$ 1,395,094
Accounts receivable	$ 428,363		$ 456,860
Explanation of terms and conditions of outstanding balances for related party transaction	Net 60 days	Net 60 days	Net 60 days	Net 60 days

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Significant Related Party Transactions - Significant Transactions between Company and Other Related Parties (Detail) shares in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($) shares	Dec. 31, 2020 TWD ($) shares	Dec. 31, 2019 TWD ($) shares	Dec. 31, 2021 USD ($)
Disclosure of transactions between related parties [line items]
Accounts receivable-related parties, net	$ 566,338	$ 178,918		$ 20,416
Acquisition of financial assets at fair value through profit or loss – noncurrent, Purchase price	19,501,274	14,826,087		703,002
Acquisition of investments accounted for under the equity method, Purchase price	28,138,378	20,330,138		$ 1,014,361
Associates [member]
Disclosure of transactions between related parties [line items]
Operating revenues	2,778,544	2,085,425	$ 1,532,339
Accounts receivable-related parties, net	555,064	172,808
Refund liability, current	1,841	1,186
Acquisition of financial assets at fair value through profit or loss – noncurrent, Purchase price			70,134
Acquisition of investments accounted for under the equity method, Purchase price			$ 720,000
Acquisition of investments accounted for under the equity method, Trading Volume | shares			72,000
Associates [member] | Stock Of Materials Analysis Technology Inc [member]
Disclosure of transactions between related parties [line items]
Acquisition of financial assets at fair value through profit or loss – noncurrent, Purchase price			$ 32,923
Acquisition of shares, noncurrent financial assets at fair value through profit or loss, Trading Volume | shares			500
Associates [member] | Stock Of Gear Radio Ltd [member]
Disclosure of transactions between related parties [line items]
Acquisition of financial assets at fair value through profit or loss – noncurrent, Purchase price			$ 37,211
Acquisition of shares, noncurrent financial assets at fair value through profit or loss, Trading Volume | shares			1,900
Associates [member] | Stock of Wellysun Inc [Member]
Disclosure of transactions between related parties [line items]
Acquisition of financial assets at fair value through profit or loss – noncurrent, Purchase price		$ 25,000
Acquisition of shares, noncurrent financial assets at fair value through profit or loss, Trading Volume | shares		1,000
Associates [member] | Stock of Artery Technology Corporation [Member]
Disclosure of transactions between related parties [line items]
Acquisition of financial assets at fair value through profit or loss – noncurrent, Purchase price	$ 13,929
Acquisition of shares, noncurrent financial assets at fair value through profit or loss, Trading Volume | shares	82
Other related parties [member]
Disclosure of transactions between related parties [line items]
Operating revenues	$ 38,797	$ 26,856	$ 45,523
Accounts receivable-related parties, net	11,274	6,110
Refund liability, current	27	36
Other payables of mask expenditure	560,042	532,810	683,892
All other related parties [member]
Disclosure of transactions between related parties [line items]
Operating revenues	2,817,341	2,112,281	$ 1,577,862
Refund liability, current	$ 1,868	$ 1,222

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Significant Related Party Transactions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021
Domestic [member] | Bottom of range [member]
Disclosure of transactions between related parties [line items]
Collection periods for accounts receivables	month-end 30 days
Domestic [member] | Top of range [member]
Disclosure of transactions between related parties [line items]
Collection periods for accounts receivables	month-end 60 days
Overseas [member] | Bottom of range [member]
Disclosure of transactions between related parties [line items]
Collection periods for accounts receivables	month-end or net 30 days
Overseas [member] | Top of range [member]
Disclosure of transactions between related parties [line items]
Collection periods for accounts receivables	month-end or net 60 days

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Significant Related Party Transactions - Key Management Personnel Compensation (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of transactions between related parties [abstract]
Short-term employee benefits	$ 562,117	$ 435,251	$ 271,135
Post-employment benefits	2,322	2,458	2,406
Termination benefits	0	283	3,415
Share-based payment	1,035,401	365,666	62,203
Others	578	571	578
Total	$ 1,600,418	$ 804,229	$ 339,737

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Assets Pledged as Collateral - Summary of Assets Pledged as Collateral (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 32,899,544	$ 29,360,966
Refundable deposits bank deposit [member] | Customs [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 811,660	811,072
Purpose of pledge	Customs duty guarantee
Refundable deposits bank deposit [member] | Science park bureau [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 234,304	234,286
Purpose of pledge	Collateral for land lease
Refundable deposits bank deposit [member] | Science park bureau [member] | Dormitory lease [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 20,619	18,215
Purpose of pledge	Collateral for dormitory lease
Refundable deposits bank deposit [member] | Liquefied natural gas business division, CPC corporation, Taiwan [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 26,600	41,785
Purpose of pledge	Energy resources guarantee
Refundable deposits bank deposit [member] | Bank of China and Agricultural Bank of China [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 1,151,200	1,000,000
Purpose of pledge	Bank performance guarantee
Refundable deposits bank deposit [member] | Shanghai Commercial Bank [Member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 6,711
Purpose of pledge	Collateral for letter of credit
Buildings [member] | Taiwan Cooperative Bank and Secured Syndicated Loans from China Development Bank and 6 others [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 5,014,814	5,310,769
Purpose of pledge	Collateral for long-term loans
Machinery and equipment [member] | Taiwan Cooperative Bank, Mega International Commercial Bank, KGI Bank, First Commercial Bank and Secured Syndicated Loans from China Development Bank and 6 others [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 25,189,533	21,370,450
Purpose of pledge	Collateral for long-term loans
Transportation equipment [member] | Secured Syndicated Loans from China Development Bank and 6 others [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 1,802	3,174
Purpose of pledge	Collateral for long-term loans
Furniture and fixtures [member] | Secured Syndicated Loans from China Development Bank and 6 others [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 161,604	281,663
Purpose of pledge	Collateral for long-term loans
Right-of-use assets [member] | Secured Syndicated Loans from China Development Bank and 6 others [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 280,697	$ 289,552
Purpose of pledge	Collateral for long-term loans

XML

Significant Contingencies and Unrecognized Contract Commitments - Additional Information (Detail) $ in Millions, $ in Millions, ¥ in Billions	Jan. 27, 2022 TWD ($)	May 03, 2021 USD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 CNY (¥)
Disclosure of contingent liabilities [line items]
Litigations and customs tax guarantee			$ 1,600
Patent license agreements and development contracts of intellectual property, contract amount			2,800
Royalties and development fees not yet recognized			900
Construction contracts, amount			19,600
Construction contracts not yet recognized			14,400
Plaintiffs [Member]
Disclosure of contingent liabilities [line items]
Payment of settlement amount		$ 3
Final Decision By The Authority [Member] | Micron Technology [Member] | Intellecutal Property And Commercial Court [Member]
Disclosure of contingent liabilities [line items]
Amount of fine	$ 20
Probation period	2 years
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member]
Disclosure of contingent liabilities [line items]
Amount of investment in subsidiaries | ¥				¥ 8.3
Financial liability recognized in other financial liabilities, current and other noncurrent liabilities for the purchase from the other investors of their investments | ¥				¥ 4.9
Machinery and equipment [member]
Disclosure of contingent liabilities [line items]
Amounts available under unused letters of credit for importing machinery and equipment			$ 300

XML

Significant Subsequent Events - Additional Information (Detail) - UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. [member] - Events after reporting period [member] ¥ in Millions, $ in Millions	Apr. 27, 2022 CNY (¥)	Apr. 27, 2022 USD ($)
Disclosure of subsidiaries [line items]
Investments commitment in subsidiaries by entity	¥ 4,120	$ 660
Additional Investment commitment by entity subsidiary	740	$ 120
Cumulative investment commitment in subsidiary by group	¥ 4,860
Percentage of investment in subsidiary by year one	60.00%	60.00%
Percentage of investment in subsidiary by year two	20.00%	20.00%
Percentage of investment in subsidiary by year three	20.00%	20.00%

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Financial Risk and Fair Value Disclosures - Categories of Financial Instruments (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	May 18, 2015 USD ($)
Disclosure of detailed information about financial instruments [abstract]
Financial assets at fair value through profit or loss	$ 20,446,295		$ 16,042,721
Financial assets at fair value through other comprehensive income	19,835,665		10,526,144
Financial assets measured at amortized cost
Cash and cash equivalents (cash on hand excluded)	132,616,447		94,042,271
Receivables	36,047,680		28,942,147
Refundable deposits	2,358,549	$ 85,023	2,310,961
Other financial assets	28,863,470		14,386,131
Total	240,168,106		166,250,375
Financial liabilities at fair value through profit or loss	2,380,599		2,326
Short-term loans	1,924,124	$ 69,363	11,057,132
Payables	37,657,300		31,188,794
Guarantee deposits (current portion included)	14,369,769		235,992
Bonds payable (current portion included)	40,536,658		18,690,384	$ 600,000
Long-term loans (current portion included)	36,624,907		33,066,106
Lease liabilities	5,068,754		5,576,864
Other financial liabilities	20,966,209		20,746,624
Total	$ 159,528,320		$ 120,564,222

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Financial Risk and Fair Value Disclosures - Additional Information (Detail) $ in Thousands, ¥ in Billions		12 Months Ended
	Oct. 01, 2019 TWD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 JPY (¥)
Disclosure of nature and extent of risks arising from financial instruments [line items]
Financial assets		$ 240,168,106	$ 166,250,375
Accounts receivables from the top ten customers		60.00%	62.00%
Profit or loss attributable to change in unrealized gains or losses for financial assets without quoted market prices held at end of period		$ 330,000	$ 721,000	$ (113,000)
Profit or loss attributable to change in unrealized gains or losses for financial liabilities without quoted market prices held at end of period		$ (360,000)	$ 0	$ 0
Interest rate risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage increase in market risk		0.10%	0.10%	0.10%
Increase (decrease) in profit due to percentage increase in market risk		$ 39,000	$ 44,000	$ 46,000
Percentage decrease in market risk		0.10%	0.10%	0.10%
Increase (decrease) in profit due to percentage decrease in market risk		$ (39,000)	$ (44,000)	$ (46,000)
Equity price risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage increase in market risk		5.00%	5.00%	5.00%
Increase (decrease) in profit due to percentage increase in market risk		$ 393,000	$ 263,000	$ 252,000
Percentage decrease in market risk		5.00%	5.00%	5.00%
Increase (decrease) in profit due to percentage decrease in market risk		$ (393,000)	$ (263,000)	$ (252,000)
Increase (decrease) in other comprehensive income due to percentage increase in market risk		867,000	453,000	671,000
Increase (decrease) in other comprehensive income due to percentage decrease in market risk		$ (867,000)	$ (453,000)	$ (671,000)
Taiwan, New Dollars | Currency risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage increase in market risk		10.00%	10.00%	10.00%
Increase (decrease) in profit due to percentage increase in market risk		$ 1,104,000	$ 1,336,000	$ 1,009,000
Percentage decrease in market risk		10.00%	10.00%	10.00%
Increase (decrease) in profit due to percentage decrease in market risk		$ (1,104,000)	$ (1,336,000)	$ (1,009,000)
China, Yuan Renminbi | Currency risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage increase in market risk		10.00%	10.00%	10.00%
Increase (decrease) in profit due to percentage increase in market risk		$ 375,000	$ 1,625,000	$ 2,200,000
Percentage decrease in market risk		10.00%	10.00%	10.00%
Increase (decrease) in profit due to percentage decrease in market risk		$ (375,000)	$ (1,625,000)	$ (2,200,000)
Japan, Yen | Currency risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage increase in market risk		10.00%	10.00%	10.00%
Increase (decrease) in profit due to percentage increase in market risk		$ 434,000	$ 473,000	$ 430,000
Percentage decrease in market risk		10.00%	10.00%	10.00%
Increase (decrease) in profit due to percentage decrease in market risk		$ (434,000)	$ (473,000)	$ (430,000)
Forward exchange contracts [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Financial assets | ¥					¥ 23
Cash flow hedge reserve in other components of equity	$ (3,000)
Ownership interest	84.10%

XML

Financial Risk and Fair Value Disclosures - Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments and Contractual Maturity (Detail) - TWD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Short-term loans	$ 1,939,109	$ 11,240,785
Payables	37,455,640	31,008,010
Guarantee deposits	14,369,769	235,992
Bonds payable	32,316,200	19,422,001
Long-term loans	40,626,127	34,200,279
Lease liabilities	5,778,937	6,432,504
Other financial liabilities	21,230,712	21,400,751
Total	153,716,494	123,940,322
Inflow		393,442
Outflow		(395,768)
Net		(2,326)
Not later than one year [member]
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Short-term loans	1,939,109	11,240,785
Payables	37,455,640	31,008,010
Guarantee deposits	108,740	793
Bonds payable	8,612,255	2,374,587
Long-term loans	21,084,795	25,885,932
Lease liabilities	688,613	695,790
Other financial liabilities	12,738,246
Total	82,627,398	71,205,897
Inflow		393,442
Outflow		(395,768)
Net		(2,326)
Later than two years and not later than three years [member]
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Short-term loans	0
Payables	0
Guarantee deposits	3,432,749	163,618
Bonds payable	8,869,431	8,484,393
Long-term loans	2,543,611	5,889,382
Lease liabilities	1,198,528	1,280,476
Other financial liabilities	8,492,466	17,120,418
Total	24,536,785	32,938,287
Later than four years and not later than five years [member]
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Short-term loans	0
Payables	0
Guarantee deposits	0
Bonds payable	10,656,506	8,563,021
Long-term loans	11,021,076	2,424,965
Lease liabilities	1,050,786	1,102,021
Other financial liabilities	0	4,280,333
Total	22,728,368	16,370,340
Later than five years [member]
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Short-term loans	0
Payables	0
Guarantee deposits	10,828,280	71,581
Bonds payable	4,178,008
Long-term loans	5,976,645
Lease liabilities	2,841,010	3,354,217
Other financial liabilities	0
Total	$ 23,823,943	$ 3,425,798

XML

Financial Risk and Fair Value Disclosures - Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments and Contractual Maturity (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 TWD ($)
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Investments in equity instruments designated at fair value through other comprehensive income	$ 8,482
Unsecured Exchangeable Bonds [Member]
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Redemption of bonds at put price at the option of bondholders, date	Jul. 07, 2024
Redemption of bonds at put price at the option of bondholders percentage of principal amount	98.14%

XML

Financial Risk and Fair Value Disclosures - Details of Forward Exchange Contracts (Detail) - Forward exchange contracts [member] $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Disclosure of detailed information about financial instruments [line items]
Notional Amount on sale of foreign currency	$ 82
Contract Period, beginning date	Dec. 11, 2020
Contract Period, end date	Feb. 05, 2021

XML

Financial Risk and Fair Value Disclosures - Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss, current	$ 945,021	$ 34,067	$ 1,216,634
Financial assets at fair value through profit or loss, noncurrent	19,501,274	703,002	14,826,087
Financial assets at fair value through other comprehensive income, current	8,482,334	305,780
Financial assets at fair value through other comprehensive income, noncurrent	11,353,331	409,277	10,526,144
Financial liabilities at fair value through profit or loss, current	2,380,599	$ 85,818	2,326
Level 1 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss, current	761,320		1,049,334
Financial assets at fair value through profit or loss, noncurrent	9,323,064		5,546,320
Financial assets at fair value through other comprehensive income, current	8,482,334
Financial assets at fair value through other comprehensive income, noncurrent	8,849,869		9,058,372
Financial liabilities at fair value through profit or loss, current	0
Level 2 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss, current	0		2,384
Financial assets at fair value through profit or loss, noncurrent	497,751		393,856
Financial assets at fair value through other comprehensive income, current	0
Financial assets at fair value through other comprehensive income, noncurrent	0
Financial liabilities at fair value through profit or loss, current	0		2,326
Level 3 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss, current	183,701		164,916
Financial assets at fair value through profit or loss, noncurrent	9,680,459		8,885,911
Financial assets at fair value through other comprehensive income, current	0
Financial assets at fair value through other comprehensive income, noncurrent	2,503,462		$ 1,467,772
Financial liabilities at fair value through profit or loss, current	$ 2,380,599

XML

Financial Risk and Fair Value Disclosures - Reconciliation for Fair Value Measurement in Level 3 Fair Value Hierarchy (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of fair value measurement of assets [line items]
Beginning balance	$ 366,454,101
Ending balance	450,955,341	$ 16,256,501	$ 366,454,101
Level 3 [member] | Financial assets at fair value through profit or loss [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	9,050,827		8,275,715
Recognized in profit (loss)	515,001		829,446
Recognized in other comprehensive income (loss)	0
Acquisition	1,837,640		1,485,962
Disposal	(1,192,633)		(909,376)
Return of capital	(69,336)		(1,903)
Transfer out of Level 3	(161,564)		(428,188)
Exchange effect	(115,775)		(200,829)
Ending balance	9,864,160		9,050,827
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Common stock [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	3,241,478		2,880,688
Recognized in profit (loss)	278,951		589,664
Recognized in other comprehensive income (loss)	0
Acquisition	695,146		547,932
Disposal	(447,915)		(308,041)
Return of capital	(252)		(1,903)
Transfer out of Level 3	(161,564)		(428,188)
Exchange effect	(21,518)		(38,674)
Ending balance	3,584,326		3,241,478
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Preferred stocks [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	3,279,003		3,279,294
Recognized in profit (loss)	(818,848)		180,523
Recognized in other comprehensive income (loss)	0
Acquisition	829,751		294,251
Disposal	(660,904)		(374,112)
Return of capital	0
Transfer out of Level 3	0
Exchange effect	(48,756)		(100,953)
Ending balance	2,580,246		3,279,003
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Funds [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	2,314,016		2,011,025
Recognized in profit (loss)	1,061,793		19,611
Recognized in other comprehensive income (loss)	0
Acquisition	201,649		340,323
Disposal	0
Return of capital	(69,084)
Transfer out of Level 3	0
Exchange effect	(43,722)		(56,943)
Ending balance	3,464,652		2,314,016
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Convertible bonds [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	216,330		104,708
Recognized in profit (loss)	(6,895)		39,648
Recognized in other comprehensive income (loss)	0
Acquisition	111,094		303,456
Disposal	(83,814)		(227,223)
Return of capital	0
Transfer out of Level 3	0
Exchange effect	(1,779)		(4,259)
Ending balance	234,936		216,330
Level 3 [member] | Financial assets at fair value through other comprehensive income [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	1,467,772		1,305,924
Recognized in profit (loss)	0
Recognized in other comprehensive income (loss)	1,035,690		161,848
Acquisition	0
Disposal	0
Return of capital	0
Transfer out of Level 3	0
Exchange effect	0
Ending balance	2,503,462		1,467,772
Level 3 [member] | Financial assets at fair value through other comprehensive income [member] | Common stock [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	1,297,627		1,130,430
Recognized in profit (loss)	0
Recognized in other comprehensive income (loss)	1,053,976		167,197
Acquisition	0
Disposal	0
Return of capital	0
Transfer out of Level 3	0
Exchange effect	0
Ending balance	2,351,603		1,297,627
Level 3 [member] | Financial assets at fair value through other comprehensive income [member] | Preferred stocks [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	170,145		175,494
Recognized in profit (loss)	0
Recognized in other comprehensive income (loss)	(18,286)		(5,349)
Acquisition	0
Disposal	0
Return of capital	0
Transfer out of Level 3	0
Exchange effect	0
Ending balance	$ 151,859		$ 170,145

XML

Financial Risk and Fair Value Disclosures - Reconciliation for Fair Value Measurement in Level 3 Derivatives Financial Liabilities (Detail) - 12 months ended Dec. 31, 2021 $ in Thousands, $ in Thousands	TWD ($)	USD ($)
Disclosure of fair value measurement of liabilities [line items]
Beginning balance	$ 143,314,539
Ending balance	186,580,294	$ 6,726,038
Derivatives [member] | Financial liabilities at fair value through profit or loss, category [member] | Level 3 [member]
Disclosure of fair value measurement of liabilities [line items]
Beginning balance	0
Recognized in profit (loss)	360,494
Issuance	2,020,105
Ending balance	$ 2,380,599

XML

Financial Risk and Fair Value Disclosures - Summary of Significant Unobservable Inputs of Fair Value Measurement in Level 3 Fair Value Hierarchy (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Embedded Derivatives In Exchangeable Bonds [Member] | Binomial Tree Valuation Model [Member] | Historical volatility for shares, measurement input [member]
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Significant unobservable input entity own equity instruments volatility	45.84%
Bottom of range [member] | Equity price risk [member] | Unlisted equity securities [member] | Discount for lack of marketability [member] | Market approach [member]
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Discount for lack of marketability significant unobservable inputs entity own equity instruments	0.00%	0.00%
Top of range [member] | Equity price risk [member] | Unlisted equity securities [member] | Discount for lack of marketability [member] | Market approach [member]
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Discount for lack of marketability significant unobservable inputs entity own equity instruments	50.00%	50.00%

XML

Financial Risk and Fair Value Disclosures - Summary of Significant Unobservable Inputs of Fair Value Measurement in Level 3 Fair Value Hierarchy (Parenthetical) (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Embedded Derivatives In Exchangeable Bonds [Member] | Binomial Tree Valuation Model [Member] | Derivative Price Risk [Member] | Historical volatility for shares, measurement input [member]
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Percentage of decrease in volatility	5.00%
Percentage of increase in volatility	5.00%
Increase (decrease) in profit or loss due to percentage decrease in volatility	$ 278
Increase (decrease) in profit or loss due to percentage increase in volatility	$ (283)
Unlisted equity securities [member] | Discount for lack of marketability [member] | Market approach [member] | Equity price risk [member]
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Percentage increase in the discount for lack of marketability	5.00%	5.00%
Percentage decrease in the discount for lack of marketability	5.00%	5.00%
Increase (decrease) in other comprehensive income due to percentage increase in the discount for lack of marketability	$ (186)	$ (106)
Increase (decrease) in other comprehensive income due to percentage decrease in the discount for lack of marketability	186	106
Increase (decrease) in profit or loss due to percentage increase in the discount for lack of marketability	(281)	(283)
Increase (decrease) in profit or loss due to percentage decrease in the discount for lack of marketability	$ 242	$ 231

XML

Financial Risk and Fair Value Disclosures - Assets and Liabilities Not Recorded at Fair Value on a Recurring Basis But for Which Fair Value is Disclosed (Detail) $ in Thousands, $ in Millions	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	May 18, 2015 USD ($)
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	$ 40,536,658	$ 18,690,384	$ 600
Long-term loans (current portion included)	36,624,907	33,066,106
Not measured at fair value in statement of financial position but for which fair value is disclosed [member]
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	41,947,014	18,861,597
Long-term loans (current portion included)	36,624,907	33,066,106
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 1 [member]
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	31,442,469	18,861,597
Long-term loans (current portion included)	0
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 2 [member]
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	10,504,545
Long-term loans (current portion included)	36,624,907	$ 33,066,106
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 3 [member]
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	0
Long-term loans (current portion included)	$ 0

XML

Operating Segment Information - Geographic Non-current Assets Information (Detail) - TWD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure of Geographical Areas [Line Items]
Non-current assets	$ 150,838,197	$ 147,488,884
Taiwan [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	81,505,018	64,563,752
Singapore [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	10,610,974	11,621,141
China (includes Hong Kong) [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	48,667,135	59,643,273
Japan [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	10,010,255	11,591,851
USA [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	24,116	46,484
Europe [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	18,210	21,257
Others [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	$ 2,489	$ 1,126

XML

Operating Segment Information - Individual Customers Accounting for at least 10% of Operating Revenues (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of Major Customers [Line Items]
Operating revenues	$ 213,011,018	$ 7,678,840	$ 176,820,914	$ 148,201,641
Customer concentration risk [member] | Wafer fabrication [member] | Customer A [member]
Disclosure of Major Customers [Line Items]
Operating revenues	$ 21,935,208		$ 20,380,814	$ 17,576,293

XML

Capital Management - Debt to Capital Ratios (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Disclosure Of Capital Management [Abstract]
Total liabilities	$ 186,580,294	$ 6,726,038	$ 143,314,539
Less: Cash and cash equivalents	(132,622,131)	(4,780,899)	(94,048,036)	$ (3,390,340)	$ (95,492,477)	$ (83,661,739)
Net debt	53,958,163		49,266,503
Total equity	264,375,047	$ 9,530,463	223,139,562		$ 202,913,915	$ 204,397,483
Total capital	$ 318,333,210		$ 272,406,065
Debt to capital ratios	16.95%	16.95%	18.09%	18.09%