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, 2023

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 2nd Road, Hsinchu Science Park,

Hsinchu 300094, Taiwan, R.O.C.

(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 114066, 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.

12,529,822,160 Common Shares of Registrant issued and outstanding as of December 31, 2023

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. ☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

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, 2023

Table of Contents

		Page
SUPPLEMENTAL INFORMATION			1
FORWARD-LOOKING STATEMENTS IN THIS ANNUAL REPORT MAY NOT BE REALIZED			1
PART I.			5
ITEM 1	IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS		5
ITEM 2	OFFER STATISTICS AND EXPECTED TIMETABLE		5
ITEM 3	KEY INFORMATION		5
ITEM 4	INFORMATION ON THE COMPANY		20
ITEM 4A.	UNRESOLVED STAFF COMMENTS		38
ITEM 5	OPERATING AND FINANCIAL REVIEW AND PROSPECTS		39
ITEM 6	DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES		47
ITEM 7	MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS		51
ITEM 8	FINANCIAL INFORMATION		52
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		74
PART II.			76
ITEM 13	DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES		76
ITEM 14	MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS		76
ITEM 15	CONTROLS AND PROCEDURES		76
ITEM 16A.	AUDIT COMMITTEE FINANCIAL EXPERT		79
ITEM 16B.	CODE OF ETHICS		79
ITEM 16C.	PRINCIPAL ACCOUNTANT FEES AND SERVICES		79
ITEM 16D.	EXEMPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES		80
ITEM 16E.	PURCHASE OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED PURCHASERS		80
ITEM 16F.	CHANGE IN REGISTRANT’S CERTIFYING ACCOUNTANT		80
ITEM 16G.	CORPORATE GOVERNANCE		80
ITEM 16H.	MINE SAFETY DISCLOSURE		81
ITEM 16I.	DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS		81
ITEM 16J.	INSIDER TRADING POLICIES		81
ITEM 16K.	CYBERSECURITY		81
PART III.			83
ITEM 17	FINANCIAL STATEMENTS		83
ITEM 18	FINANCIAL STATEMENTS		83
ITEM 19	EXHIBITS		84

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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. 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. 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 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;

• fluctuations in foreign currency exchange rates;

• geopolitical conflicts, including political relationships between U.S., China and Taiwan;

• 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.

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.

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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.
RAM	Random Access Memory. A type of volatile memory forming the main memory of a computer where applications and files are run.
RRAM	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.

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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.
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.
12-inch wafer equivalents	Standard unit describing the equivalent amount of 12-inch wafers produced after conversion, used to quantify levels of wafer production for purposes of comparison. Figures of 12-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 12-inch wafers. 100 6-inch wafers are equivalent to 25 12-inch wafers. 100 8-inch wafers are equivalent to 44.44 12-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, since early 2023, semiconductor industry has experienced an economic downturn that has resulted and is likely to result in reduced demand for consumer electronics and other products incorporating semiconductors, which has in turn affected our business operations and financial conditions. In addition, even when these crises have abated, there could be in the future lingering 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.

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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;

• pandemic and outbreaks of other contagious diseases;

• regulatory development and changes affecting our business operations globally;

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

• announcement of major collaboration or partnership agreements;

• 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.

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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, based on 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.

7

The outbreak of infectious disease may materially and adversely affect our business and operations as well as our financial condition and results of operations

Any outbreak of contagious diseases, including but not limited to Zika virus, Ebola virus, avian or swine influenza or severe acute respiratory syndrome, in any region of the world in which we operate our business may disrupt our ability to adequately staff our business and may generally disrupt our operations. An occurrence of a major pandemic, such as the recent COVID-19 pandemic, can materially and adversely affect our operations and the semiconductor markets in which we conduct our business. We have significant operations in China, Taiwan and the Asia Pacific region, including supply chain and manufacturing facilities and sales and marketing channels. If potential outbreak occurs in these areas, we may experience a decline of sales activities and customer orders; reduction of operation and workforce at our fabs; difficulties in international travels and communications; regulatory restrictions; reduction of research and development activities; and other risks resulting from the outbreak. Any of these factors may adversely affect our business, financial conditions and results of operations. However, we cannot predict the impact of future infectious disease on the semiconductor industry in the future, and any increase in such demand may not be sustainable and we may experience a decline in our sales activities and customer orders.

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 relationships, including service and design support;

• price;

• management expertise; and

• strategic alliances.

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;

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• 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.

Our agreement with Intel subject us to additional risks, and we may not be able to succeed or generate sufficient revenue or profit as we anticipated under the Intel agreement.

On January 25, 2024, we entered into a collaboration with Intel Corporation for the purpose of developing a 12nm semiconductor process platform to address high-growth markets such as mobile, communication infrastructure and networking (the “Collaboration”). The Collaboration combines Intel’s established U.S. manufacturing capacity and UMC’s extensive foundry experience on mature nodes to enable an expanded process portfolio, and we currently expect production of 12nm products in 2027. However, the Collaboration subject us to additional risks in our business operations, including but are not limited to:

• Additional cost and investment to operate and support a manufacturing facility in the U.S.;

• Inability to control over the manufacturing process;

• Disagreement or conflict with Intel as to the terms of Collaboration;

• Lack of experience with operating or managing a foundry in the U.S.;

• Inability to recruit or retain qualified personnel to advance the collaboration;

• Delays in ramp-up productions;

• Failure of customers to accept new products; and

• Compliance with U.S. regulatory and legal requirements.

In addition, there is no guarantee that the Collaboration will result in financial and economic benefits as we anticipated. Any of the risk factors listed above and other risks may cause a delay in the production of 12nm products under the Collaboration or even prevent us from completing the joint development projects. Our failure to succeed or generate sufficient revenue under the Collaboration will adversely affect our business operations and results of operations, and may damage our reputation and adversely affect the trading price of our ADS.

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. Our top ten customers accounted for 54.5%, 52.4% and 62.0% of our operating revenues in 2021, 2022 and 2023, respectively. Our largest customer from our wafer fabrication segment accounted for 10.3%, 8.6% and 13.1% of our operating revenues in 2021, 2022 and 2023, respectively. 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 have long-term agreements with us to purchase wafers, and many customers 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.

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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.

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.

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.

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.

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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 12-inch wafer equivalents divided by our estimated total 12-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.

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 are a manufacturing company that relies on suppliers to provide raw materials. In order to ensure stable manufacturing operations, we have signed long-term supply contracts with our suppliers to obtain sufficient quantities of acceptable quality raw materials. For example, 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. Although we source raw materials from multiple suppliers, a small number of these suppliers hold an important position in our raw material supply due to the consistency of their product quality, and this concentration of supply may subject us to additional risks, particularly if we are not able to maintain relationships with these suppliers. In addition, our ability to source raw materials may depend on factors outside of our control, such as geopolitical tensions and regulatory development that could restrict our ability to do business with these suppliers.

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. 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.

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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 twelve to eighteen months. If there are delays in the delivery of equipment or in the availability or performance of necessary maintenance, 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.

With the fluctuations in the economy, the demand for semiconductors declined from 2023, and some material supply and demand situations will be alleviated. In order to reduce supply risks in the future, we are actively engaging new supply sources. However, there is no guarantee that we will be able to secure new supply sources, and even if we are able to identify such sources, we may have difficulties in negotiating terms favorable to us.

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. Despite taking many countermeasures, the risk of fire associated with these materials cannot be completely eliminated. We maintain insurance policies to reduce losses caused by fire, including property damage and 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, which will adversely affect our business operations and results of operations. In order to mitigate the impact, we have introduced the ISO 22301 BCM system in all production fab and practice emergency response every year to speed up the recovery time in the event of a fire. However, these additional measures may not be sufficient to prevent all future risks of loss.

We 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 suppliers are located in certain parts of Taiwan. Our operations 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 lead to business disruptions. For example, given the prolonged period in the lack of rainfall particularly acute in southern Taiwan which may impact our manufacturing capacity, 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 anti-seismic damper and anchorage in our fab, piping and equipment which ensured the safety of our employees and minimized impact resulting from the earthquake, and we recovered partially the losses resulting for this earthquake from our insurance policy, there is no guarantee that all countermeasures will always be effective when exceed its design limit. There is also no guarantee that any future damages or business loss from severe natural disasters will be covered by insurance, or that such coverage will be sufficient due to unpredictable insurance market. 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.

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.

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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, “Climate Change Response Act” was promulgated in February 2023 to accelerate the goal of achieving net-zero carbon emissions by 2050 with additional stringent requirements such as carbon tariffs on imports of carbon-intensive products and a carbon-fee charging to urge enterprises for GHG reduction. The Ministry of Environment announced that companies that emit more than 25,000 metric tons of carbon dioxide a year will be charged carbon fees in 2025, based on their total emissions in 2024. The impacts on UMC include an increase in operating and investment costs.

In addition, government’s energy management measures may cause power shortage and affect our business operation. For example, China government requested enterprises to reduce electricity consumption in 2022. Although UMC’s plants in China have not been directly affected, there is no guarantee that such reduction in consumption will not occur in the future.

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. Starting in 2021, UMC will continue to conduct third party TCFD performance assessment to provide 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.

We have operations worldwide and a significant percentage of our operating revenues is generated from sales to locations outside the R.O.C. and we expect this trend to continue in the foreseeable future. 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, intellectual property rights, 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.

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.

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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.

In addition, the Organization for Economic Cooperation and Development (“OECD”) create the Base Erosion and Profit Shifting (BEPS) Actions, which contemplates changes to numerous international tax principles. These changes may increase our income tax rate in future, which may adversely affect our net income.

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.

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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;

• 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 developments could further impact Company’s operations affecting our business

Rising political or economic tensions between US and China have led to restrictions on the shipment and distribution of certain goods, including tools and equipment used in the semiconductor industry, which have triggered a trade war. Additional measures from governments may lead to tariff increases, embargoes, policy interventions, and government subsidies. U.S.-China tension has also affected cross-strait relations, and the rise in escalations have increased the uncertainty of future business environment affecting Company’s operations and investments including revenue, delivery time, goodwill, and investment plans. For example, a sharp increase in US or European tariffs may favor local/domestic manufacturers while hurting exports which may drive up costs of the Company’s products which is manufactured in Asia. This would reduce demand from our customers towards UMC impacting our business and operations; the United States Export Control Act regulates exports to certain countries if the content originating from the U.S. exceeds a certain ratio of the product, this will affect UMC’s direct or indirect supply to specific customers; restrictions on the export of high-tech materials or equipment may affect UMC’s production and capacity expansion plans, which may disrupt shipments and damage the Company’s goodwill, while investment restrictions and regulatory changes may potentially affect the Company’s strategic planning, operational and financial performance. In addition, political tensions in the Taiwan Strait, including any threat of potential military confrontation between China and Taiwan, as well as U.S. involvement of any such military operations, may discourage customers to place orders with us. We cannot predict the geopolitical development in the future and if the geopolitical landscape further deteriorates, potential supplies such as materials could be disrupted and ceased, which will negatively affect our financial performance.

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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.

Conflicts between Ukraine and Russia could lead to sourcing risks of indirect materials which could affect Company’s business and profitability

The ongoing war between Ukraine and Russia has resulted in the imposition of trade barriers, such as sanctions and import and export controls, which could increase our manufacturing costs, limit our access to certain supplies, make our pricing less competitive, increase the cost of energy and power, and limit our ability to offer our products and services in some markets or source key materials and key production equipment, which may have adverse direct or indirect effects on our sales.

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.

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.

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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.

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.

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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 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 2023 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.

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.”

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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 and our ADSs are listed on New York 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 2^nd Road, Hsinchu Science Park, Hsinchu, Taiwan, R.O.C, 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 2023, we were ranked among the top 5% of companies for the ninth consecutive year in the Corporate Governance Evaluation conducted by the Taiwan Stock Exchange and Taipei Exchange. The assessment was conducted across over 1,600 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, 2021, 2022 and 2023.

	Years Ended December 31,
Application	2021		2022		2023
	%		%		%
Communication		46.2		45.2		45.1
Consumer		26.6		26.2		24.0
Computer		16.7		14.6		11.0
Others		10.5		14.0		19.9
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 2023, our company’s top ten customers accounted for 62.0% 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 36,733 per month, specializing in the manufacturing of 90nm, 65nm, 55nm 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. In February 2020, our subsidiary HeJian Technology’s board of directors approved an investment of US$500 million in USCXM which was completed in March 2023. In addition, we obtained approval from the R.O.C. government on October 26, 2022 for a US$120 million investment by HJ and a US$664 million investment by UMC to purchase equity interest of USCXM from existing shareholders. After the completion of the transaction in July 2023, the company and HJ hold 100% of the shares of USCXM, and USCXM has increased its contribution to the overall financial performance of UMC. As one of UMC’s four 12-inch fabs in geographically diverse locations, USCXM provides global customers with high-quality fabrication services and varied manufacturing options.

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.

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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.

On February 24, 2022, we announced that our board has approved a plan to build a new advanced manufacturing facility next to its existing 300mm fab in Singapore. This greenfield fab is expected to provide a monthly capacity of 30,000 wafers. The new fab will be one of the most advanced semiconductor foundries in Singapore utilizing our proprietary 22/28nm processes. We expect the new fab will play an important role in satisfying growing demand in these markets.

On April 26, 2022, DENSO Corporation, or DENSO, a leading mobility supplier, and USJC announced that the companies have agreed to collaborate on the production of power semiconductors at USJC’s 300mm fab in order to serve the growing demand in the automotive market. An insulated gate bipolar transistor (IGBT) line will be installed at USJC’s wafer fab, which will be the first such facility in Japan to produce IGBTs on 300mm wafers. DENSO will contribute its system-oriented IGBT device and process technologies while USJC will provide its 300mm wafer manufacturing capabilities to bring the 300mm IGBT process into mass production.

On January 25, 2024, we entered into a collaboration with Intel Corporation (the “Collaboration”), pursuant to which the parties agreed to jointly develop new 12nm related technology and commercialize such technology. In connection with such Collaboration, the parties granted each other IP licenses and rights necessary to carry out their respective obligations. The Collaboration is expected to create a 12nm semiconductor process platform to address high-growth markets such as mobile, communication infrastructure and networking. The Collaboration agreements set out terms to bring together Intel’s at-scale U.S. manufacturing capacity and UMC’s extensive foundry experience on mature nodes to enable an expanded process portfolio. The Collaboration also expects to offer global customers greater choice in their sourcing decisions with access to a more geographically diversified and resilient supply chain. We believe that the Collaboration will enable UMC’s customers to smoothly migrate to a 12nm node, and allow UMC to establish a more significant footprint in the U.S. Production of the 12nm process, which is expected to begin in 2027.

The Collaboration provides for a long-term agreement between UMC and Intel. The agreements may be terminated upon the occurrence of specified events, each as further set forth therein, including uncured material breach or violation of laws, inability to gain required regulatory approval, bankruptcy or similar circumstances, certain change of control transactions or failure to achieve certain business or operational milestones.

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:

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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.

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 MediaTek, Realtek, Novatek and Texas Instruments. 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 semiconductor manufacturing technology for mass production is critical to attract and retain customers. Our reputation for technological excellence enabled us to acquire 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. In addition to research and development, in 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. Furthermore, on February 24, 2022 our board of directors approved a plan to build a new advanced manufacturing facility next to our existing 300mm fab (Fab12i) in Singapore. The first phase of this greenfield fab is expected to have a monthly capacity of 30,000 wafers with production expected to commence in first half of 2025. The new fab (Fab12i P3) will utilize 28nm and 22nm process 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 collaborating with DENSO. In 2022, we agreed to jointly work on the production of power semiconductors at USJC’s 300mm fab in order to serve the growing demand in the automotive market. This cooperation will leverage our robust portfolio of advanced specialty technologies and IATF 16949 certified fabs in diversified locations, where we are well placed to serve demand across auto applications, including advanced driver assistance systems, infotainment, connectivity, and powertrain.

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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.

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, 2023.

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)

27,577

69,142

39,800

39,450

43,700

48,200

38,000

84,500

115,376

54,807

26,500

36,733

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, No. 3, 5, Li-Hsin 2nd Rd., Hsinchu Science Park, Hsinchu, Taiwan 300094, R.O.C.	43,130 / 83,699	8-inch wafer production	Leased (expires in December 2033)	Owned
Fab 8C & Fab 8D, No. 6, 8, Li-Hsin 3rd Rd., Hsinchu Science Park, Hsinchu, Taiwan 300094, R.O.C.	33,784 / 100,609	8-inch wafer production	Leased (expires in December 2033)	Owned
Fab 8E, No. 17, Li-Hsin Rd., Hsinchu Science Park, Hsinchu, Taiwan 300094, R.O.C.	35,779 / 76,315	8-inch wafer production	Leased (expires in February 2036)	Owned
Fab 8F, No. 3, Li-Hsin 6th Rd., Hsinchu Science Park, Hsinchu, Taiwan 300096, R.O.C.	23,774 / 65,736	8-inch wafer production	Leased (expires in February 2038)	Owned
Fab 8S, No. 16, Creation 1st Rd., Hsinchu Science Park, Hsinchu, Taiwan 300093, R.O.C.	20,365 / 65,614	8-inch wafer production	Leased (expires in December 2023)	Owned
Fab 8N, No. 333, Xinghua St., Suzhou Industrial Park, Suzhou, Jiangsu Province 215025, P.R.C.	215,621 / 112,247	8-inch wafer production	Leased (expires in December 2052)	Owned
Fab 12A, No. 18, 20, Nan-Ke 2nd Rd., & No. 57, Nan-ke 3rd Rd., Tainan Science Park, Sinshih, Tainan, Taiwan 744092 & 744094, R.O.C.	247,798 / 633,904	12-inch wafer production	Leased (expires in June 2042)	Owned
Fab 12i, No. 3, Pasir Ris Drive 12, Singapore 519528	197,810 / 380,219	12-inch wafer production	Leased (expires in July 2052)	Owned
Fab 12X, No. 899, Wan Jia Chun Road, Xiang’an District, Xiamen, Fujian Province 361101, P.R.C.	250,725 / 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 / 152,486	12-inch wafer production	Owned	Owned
United Tower, No. 3, Li-Hsin 2nd Rd., Hsinchu Science Park, Hsinchu, Taiwan 300094, R.O.C.	8,985 / 85,224	Administration office	Leased (expires in December 2033)	Owned
Neihu Rd. Office, 8F, No. 68, Sec. 1, Neihu Rd., Taipei, Taiwan 114066, R.O.C.	626 / 4,817	Administration office	Owned	Owned
Testing Building, No. 1, Chin-Shan, 7th St., Hsinchu, Taiwan 300063, R.O.C.	10,762 / 41,318	Leased to several companies	Owned	Owned
R&D Building, No. 18, Nan-Ke 2nd Rd., Tainan Science Park, Sinshih, Tainan, Taiwan 744092, R.O.C.	42,000 / 47,396	Research and development	Leased (expires in December 2023)	Owned
Wavetek, No. 10, Chuangxin 1st Rd., Hsinchu Science Park, Baoshan Township, Hsinchu, Taiwan 300092, R.O.C.	27,898 / 34,609	6-inch wafer production	Leased (expires in December 2034)	Owned

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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.

UMC has been constantly strengthening its independent R&D capabilities and fabrication in semiconductor process technologies, especially dedicated to the R&D of logic and specialty processes in the recent years. The Company will adhere to its R&D strategy to establish independent R&D capabilities and will work with important partners, such as IDM and fabless, to develop key process technologies through technology licensing. We will also work with suppliers of photomask, packaging, equipment, material, and EDA to accelerate market launch schedule in order to fulfill the Company’s promise to provide customers with innovative and reliable process technologies.

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. Moreover, UMC is actively developing a 12nm FinFET Compact (12FFC), with a significant performance boost, smaller chip size, and lower power consumption, compared to the 14FFC process. The 12FFC is more competitive and gives full play to the advantages of FinFET process technology to drive the application of next-generation silicon chips in various fields, such as networking, artificial intelligence, and further high-end consumer electronic products. It is expected to complete the process verification in 2026 and enter production in 2027.

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, 55/40/28/22nm embedded high voltage device used for display drivers, 55/28/22nm BSI-CSI for image sensors and 110/55nm BCD for power management circuits. We also developed 40/22nm RRAM for advanced node embedded solutions, and RF-SOI technologies of 110/90/55/40nm nodes covering both custom and platform for RF device applications. We also partnered with Avalanche for joint development and production of MRAM to provide an alternative product out of embedded flash in 2018 for 22nm technologies. The 22nm high-density 1Gb HDMRAM product, to be applied in aerospace/LEO satellite communications, has entered trial production. All of these specialty technologies can provide system on chip solutions.

UMC has accumulated years of experience in 2.5D Si-interposer solutions, providing our customers with various applications in high-performance computing (HPC), cloud computing, and large language models (LLMs) for artificial intelligence (AI). UMC newly launched wafer-level 3D W2W hybrid bonding solution offers advantages in both bandwidth and form factor reduction, meeting the growing trend of edge computing and miniaturization needs in mobile devices. UMC has collaborated with customers to enter the trial production stage in the application of RF components in mobile devices. In terms of edge AI applications, UMC has established a one-stop vertical integration project with our supply chain partners, providing customized low-power logic chips and memory module combinations to meet the needs of customers in IoT, secure smart infrastructure, and other terminal devices.

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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 2023, and the estimated annual full capacity of each fab, actual total annual output and capacity utilization rates in 2021, 2022 and 2023:

		Year Ended December 31, 2023 Range of		Years Ended December 31,
	Years of	Process		2021			2022			2023
	Commencement of Operation	Technologies (in microns)		(in thousands of 12-inch wafer equivalents, except percentages)
Wavetek	1989		5 to 0.15		82			84			82
Fab 8A	1995		3 to 0.11		336			340			360
Fab 8C	1998		0.35 to 0.11		204			204			210
Fab 8D	2000		0.18 to 0.09		169			182			195
Fab 8E	1998		0.6 to 0.14		203			208			218
Fab 8F	2000		0.18 to 0.11		228			245			253
Fab 8S	2000		0.18 to 0.11		181			197			199
Fab 8N	2003		0.5 to 0.11		408			423			442
Fab 12A	2002		0.13 to 0.014		1,070			1,170			1,305
Fab 12i	2004		0.13 to 0.040		641			655			655
Fab 12X	2016		0.080 to 0.022		284			314			317
Fab 12M	2005		0.13 to 0.040		395			436			438
Total estimated capacity	—		—		4,201			4,458			4,674
Total output (actual)	—		—		4,387			4,486			3,201
Average capacity utilization	—		—		104.4	%		100.6	%		68.5	%

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 104.4% in 2021, 100.6% in 2022 and 68.5% in 2023.

Equipment

Because the performance and productivity of our manufacturing capability depends substantially on the technology node of our capital equipment, we always purchase equipment that not only meet the criteria of our existing process requirement, but also have the capability to be upgraded to match our future demand. 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 performance proven equipment from vendors with dominant market share to ensure our continued competitiveness in the semiconductor field.

Although some equipment is only available from limited qualified vendors and/or is manufactured in limited quantities, we believe that our relationships with equipment suppliers are strong enough to allow us to leverage our position as a major customer to purchase equipment with 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 through procurement process via timely internal cross-division communications, efficient market information collection, early slot booking and constant communications with our suppliers.

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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.

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 high quality standards 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 62.0% of our operating revenues in 2023.

Set forth below is a geographic breakdown of our operating revenues in 2021, 2022 and 2023 by the location where our customers are headquartered.

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	Years Ended December 31,
Region	2021		2022		2023
	%		%		%
Taiwan		43.4		37.8		30.7
China (including Hong Kong)		12.7		14.2		12.4
Japan		6.3		6.1		5.2
Korea		8.2		9.2		13.9
USA		22.0		24.2		26.6
Europe		7.4		8.5		11.2
Others		0.0		0.0		0.0
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, 2021, 2022 and 2023.

	Years Ended December 31,
Customer Type	2021		2022		2023
	%		%		%
Fabless design companies		85.4		84.1		78.3
Integrated device manufacturers		14.6		15.9		21.7
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 Silicon Valley. 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.

(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 Security Orchestration, Automation, and Response (SOAR) and Endpoint Detection and Response (EDR), 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.

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(6) Insurance against Information Security Risks

Based on a recent report, data leakage, virus infection, ransomware attacks and hacking event in Taiwan and throughout the world, many international and well-known companies have encountered significant operating loss. 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, Japan, etc.

(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 “Integrity, Pragmatism, Agility, Ingenuity” 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.

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, 2023, we held 6,959 U.S. issued patents and 8,237 patents issued outside of the United States. As trade secret protection become increasingly critical, UMC has stepped up internal compliance training and established a robust IP management system. In 2023, UMC achieved Taiwan Intellectual Property Management System (TIPS) certification for the second year, with our certification level improving from AA to AAA, underscoring our unwavering commitment to IP and corporate governance best practices.

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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

UMC places significant importance on the dynamics of the semiconductor industry and continues to invest and develop semiconductor manufacturing process technology and know-how. In order to continue the development of logic and specialty technologies, optimize transistor performance, reduce power consumption, and continuously enhance our technical advantages, in 2021, 2022 and 2023, we spent NT$12,935 million, NT$12,953 million and NT$13,284 million (US$434 million), respectively, on research and development, which represented 6.1%, 4.6% and 6.0% 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 2023 research and development expenditures, which was approximately 6.0% of operating revenues, and a total of 425 domestic and foreign patents granted in 2023.

As of December 31, 2023, we employed 1,478 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. We will continue to invest in technology innovation, optimize capacity to enhance product mix and penetrate emerging applications. We believe that these efforts will create higher customer adoption of our logic and specialty technologies and expand our market share to fuel growth.

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.

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)
Octtasia Investment Holding Inc.		4		425
Phison Electronics Corp.		1		219
CNEX Labs, Inc.		0		170
Hut 8 Mining Corp.		1		159
Clientron Corp.		8		156

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The following table sets forth the sales of our investments in 2022:

	Number of shares sold		Proceeds from disposal
Investees	(in millions)		(in NT$ millions)
Excellence Optoelectronics Inc.		9		201
Lanhor Fund		—		195
Lintes Technology Co., Ltd.		1		125
Mercuries Life Insurance Co., Ltd.		20		117
Winking Entertainment Ltd.		2		112

The following table sets forth the sales of our investments in 2023:

	Number of shares sold		Proceeds from disposal
Investees	(in millions)		(in NT$ millions)		(in US$ millions)
King Yuan Electronics Co., Ltd.		23		1,331		43
Unimicron Technology Corp.		2		293		10
Evergreen Aviation Technologies Corp.		3		285		9
AMPAK Technology Inc.		3		256		8
Win Win Precision Technology Co., Ltd.		4		217		7

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:

• Fully comply with or go beyond requirements of environmental laws and regulations, and international conventions, striving for zero pollution and sustainable development.

• Integrate environmental management into the Company’s operational and management systems, and build an environmentally conscious company culture.

• Actively set aggressive environmental management goals, regularly track and continuously improve environmental performance, and reduce environmental impact.

• Introduce and develop environmentally friendly technologies that can be applied to R&D, procurement, production operations, business facilities, distribution and logistics, products, and/or services to minimize environmental impact at each life cycle stage in order to achieve green design, green production, and green operations goals.

• Stay informed of environmental trends around the world, assess the associated opportunities and risks, engage in proper waste management, effectively utilize energy/resources, and promote circular economy.

• Conduct regular training on risk assessment and risk management to ensure employees understand the environmental impact of their work activities, enhance environmental protection awareness, and encourage responsible action.

• Enhance awareness of the Company’s environmental policy and environmental impact among both internal and external stakeholders (including the Company and its subsidiaries, value chain partners, civil society) through due diligence, active communication and engagement, and transparent information disclosure.

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

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Safety and Health Aspects:

• Meet or exceed the requirements on occupational safety and health of the place of operation and comply with ISO 45001 and relevant international standards, aiming for zero incident. The company is committed to steady development while making safety a priority.

• Set up prioritization and action plans, 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, contractors, customers as well as partners in the operation of the enterprise.

• Through communication, consultation and participation in decision-making with staff 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 workers.

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 sixteenth straight year since 2008 and also named a constituent of Emerging Markets Index in 2023;

• Selected as component of MSCI ACWI ESG Leaders Index and MSCI Emerging Markets ESG Leaders Index;

• Selected as component of FTSE4Good All-World Index and FTSE4Good Emerging Index for ninth consecutive year, and FTSE4Good TIP Taiwan ESG Index since the launch of the index in 2017;

• Recognized double A List by CDP for climate change and water security for two consecutive years;

• Awarded “Top 10 Taiwanese Companies Sustainability Model Award” 4^th place (2023) and “Corporate Sustainability Report Award” (2008-2023) for sixteenth consecutive year by Taiwan Institute for Sustainable Energy;

• Awarded “National Sustainable Development Award” by National Council for Sustainable Development, Executive Yuan, R.O.C. (2023);

• Awarded “National Enterprise Environmental Protection Award” by Ministry of Environment, Executive Yuan, R.O.C. (2003-2023) for twenty-first consecutive year;

• Awarded “The Best Participation of Green Procurement for Enterprises” by Ministry of Environment, Executive Yuan, R.O.C. (2011-2023);

• Awarded “Excellent Occupational Safety and Health Executive Organization” by the Hsinchu Science Park, National Science and Technology Council (1998-2023).

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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 the program of UMC Sustainability Strategy and Blueprint, we launched resource and energy productivity improvement plans which target to reduce the usage of water, electricity and waste per unit of product by 30%, 30% and 50% in 2030, 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 25% by 2025, 50% 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.

In 2022, UMC’s GHG emissions reduction target has approved by the Science Based Targets initiative (SBTi). With 2020 as the base year, UMC targets 25% reduction in direct greenhouse gas emissions (Scope 1) and indirect emissions from electricity consumption (Scope 2) by 2030. The Company also aims to lower emissions from its value chain (Scope 3) by 12.3% in the same period. SBTi’s approval is a confirmation of our intended pathway to achieve net zero while also ensuring our reduction targets are in line with what the latest climate science says is needed to prevent the worst impacts of climate change. In 2023, UMC committed to set long-term science-based targets to reach net-zero value chain GHG emissions by 2050 in line with the SBTi Net-Zero Standard. We also support timely disclosure of carbon information and ensuring data quality and 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. 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. In 2023, UMC has been recognized in CDP’s “A List” for transparency and action on both climate change and water security. The Company stands out as the sole semiconductor company globally to secure this double “A” recognition for two consecutive years and received the highest score in 9 categories among the 11 scoring categories in both two ratings, affirming its commendable performance in greenhouse gas emission reduction and water resource management.

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, which we expect to increase our revenue in 2024.

Risk Management

Risk and safety matters are administered by Group Risk Management and Environmental Safety Health Division. 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 constructing inherently safe fabs, strengthening physical protection standards, redundancy/contingency design, providing with real-time abnormity detection, implementing disciplined maintenance and inspection, deploying natural hazard early warning systems, enhancing emergency response abilities, and developing business continuity plan and crisis response exercise to achieve our continuous operation promise. The achievements in the recent years are as follows:

• Start in 1999, maintains third party audit by AIG (American International Group), a global leader in risk management and insurance, to evaluate 20 elements of physical and human management performance of each fab.

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• In place an annual contract with Belfor, a professional decontamination company whom provide services for property restoration and development of in-house procedure for initial stabilization of affected properties.

• Inherent safety design and rescue skill develop for emerging risk, including but not limit to: solar power generation system on the roof-top, and lithium battery inside collaborative robot, and electrical car, etc.

• Enhanced power distribution system’s reliability and early abnormality detection, such as gradually replace existing lead-acid UPS batteries with lithium-iron, install real-time leak current measurement of cable shielding conductors’ grounding system of HV distribution system, enlarge diesel generators installation rate to increase emergency power percentage and maintain diesel oil in a safety level, etc.

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

• Conducted BCP (Business Continuity Plan) drill for external LPG (Liquefied Petroleum Gas) and bulk GN2 (Gaseous Nitrogen) supply disruption risk.

• Enhance cleanroom’s seismic bracing for suspended ceiling and raised floor in older 8-inch fabs in Hsinchu.

Taiwan situates in Circum-Pacific Seismic Belt, and the threat of earthquakes cannot be underestimated. We have implemented tons of proactive efforts in earthquake loss prevention. We imported the latest anti-seismic technologies, a seismic isolation platform for newly installed reticle stocker and furnace and built up 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. Taiwan suffered its worst drought in 56 years in 2021, 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, UMC 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 in Tainan 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 by 2024. 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, 2023:

Company	Jurisdiction of Incorporation	Percentage of Ownership as of December 31, 2023
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.		99.01	%
United Microchip Corporation	Cayman Islands		100.00	%
Wavetek Microelectronics Corporation	Taiwan, R.O.C.		80.00	%
Everrich Energy Investment (HK) Limited	China		99.01	%
Everrich (Shandong) Energy Co., Ltd.	China		99.01	%
Wavetek Microelectronics Corporation (USA)	U.S.A.		80.00	%
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		99.9994	%
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, 2023 have been converted into U.S. dollar amounts using US$1.00 = NT$30.62, the foreign currency exchange rate on December 29, 2023 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. In recent years, 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. After experienced substantial growth for three consecutive years, there were inevitably cases of repeated orders to foundries, resulting in serious higher-than-normal inventory level. In addition, influenced by various adverse factors such as the war in Ukraine and Covid-19 lockdown and reopening in China, the foundry industry faced sluggish demand and serious inventory adjustments in 2023, resulting in lower capacity utilization for the year and weak operation performance. Our average capacity utilization rate was 104.4%, 100.6% and 68.5% for the years ended December 31, 2021, 2022 and 2023, respectively. We believe that our operating results in 2021, 2022 and 2023 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 increased by 21.3% from 2021 to 2022 and 6.3% from 2022 to 2023, which reflects the optimization in overall product mix as well as the strong market demand primarily due to the accelerated growth 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 2021, 2022 and 2023, approximately 66.3%, 67.7% and 63.9%, respectively, of our manufacturing costs consisted of depreciation, a portion of indirect material costs, amortization of license fees, indirect labor and utilities 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 104.4%, 100.6% and 68.5% for the years ended December 31, 2021, 2022 and 2023, 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.

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.

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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-inch process solutions. Our 28nm and below technologies contributed approximately 19.9%, 23.8% and 30.7% of our foundry revenue in 2021, 2022 and 2023 respectively.

The table below sets forth a breakdown of percentage of our wafer sales by process technologies in 2021, 2022 and 2023.

	Years Ended December 31,
Process Technologies	2021		2022		2023
	%		%		%
14 nanometers and under		0.1		0.1		0.0
28 nanometers		19.8		23.8		30.7
40 nanometers		18.8		17.7		13.7
65 nanometers		18.8		18.2		19.2
90 nanometers		8.2		7.8		9.6
0.11/0.13 micron		11.5		11.8		10.6
0.15/0.18 micron		12.5		11.1		9.4
0.25/0.35 micron		7.8		7.1		4.8
0.50 micron or higher		2.5		2.4		2.0
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.

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.

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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 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, 2022, and 2023, we did not purchase any of our common shares, and transfer such common shares that we repurchased under these plans to our employees as employee compensation.

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$44,180 million, NT$41,328 million and NT$37,758 million (US$1,233 million) in 2021, 2022 and 2023, respectively.

Operating Expenses

Our operating expenses consist of the following:

• Sales and marketing expenses, which consist primarily of salaries and related personnel expenses, intellectual property development 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.

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.

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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;

• 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 significant influence over SILICON INTEGRATED SYSTEMS CORP. (SIS). SIS was previously measured at fair value through other comprehensive income and reclassified as investments accounted for under the equity method. UMC’s share of the net fair value of SIS’s identifiable assets and liabilities was in excess of the fair value of the previously held investment in SIS at the acquisition date, and the difference was recognized as bargain purchase gain. For more information, please refer to Note 6(7) to our audited consolidated financial statements included in this Annual Report.

Taxation

In R.O.C., the corporate income tax rate and unappropriated earnings tax rate are 20% and 5%, respectively. 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$2,995 million, NT$4,355 million and NT$1,387 million (US$45 million) in 2021, 2022 and 2023, 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 25% 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$958 million, NT$3,307 million and NT$3,074 million (US$100 million) in 2021, 2022 and 2023, respectively.

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$7,918 million, NT$19,327 million and NT$8,311 million (US$271 million) of income tax expenses in 2021, 2022 and 2023, respectively. Our effective income tax rate in 2023 was 12.14%.

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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,
	2021			2022			2023
	%			%			%
Operating revenues		100.0			100.0			100.0
Operating costs		(66.2	)		(54.9	)		(65.1	)
Gross profit		33.8			45.1			34.9
Operating expenses
Sales and marketing		(2.2	)		(1.5	)		(1.4	)
General and administrative		(3.7	)		(3.5	)		(3.4	)
Research and development		(6.1	)		(4.6	)		(6.0	)
Expected credit impairment gains (losses)		0.0			(0.0	)		0.1
Subtotal		(12.0	)		(9.6	)		(10.7	)
Net other operating income and expenses		2.5			1.9			1.8
Operating income		24.3			37.4			26.0
Non-operating income and expenses		3.2			1.9			4.8
Income from continuing operations before income tax		27.5			39.3			30.8
Income tax expense		(3.8	)		(6.9	)		(3.8	)
Net income		23.7			32.4			27.0
Total other comprehensive income (loss)		1.7			1.5			2.3
Total comprehensive income (loss)		25.4			33.9			29.3
Net income (loss) attributable to:
Shareholders of the parent		24.0			32.1			26.8
Non-controlling interests		(0.3	)		0.3			0.2
Comprehensive income (loss) attributable to:
Shareholders of the parent		25.7			33.6			29.1
Non-controlling interests		(0.3	)		0.3			0.2

Year Ended December 31, 2023 Compared to Year Ended December 31, 2022

Operating revenues. Operating revenues decreased by 20.2% from NT$278,705 million in 2022 to NT$222,533 million (US$7,268 million) in 2023, primarily due to a decreased customer demand from 4,420 thousand 12-inch equivalent wafers in 2022 to 3,195 thousand 12-inch equivalent wafers in 2023, partially offset by an increase of 6.3% in average selling price from 2022 to 2023, and a 4.5% depreciation of the NTD in 2023 from 2022.

Operating costs. Operating costs decreased by 5.3% from NT$152,941 million in 2022 to NT$144,789 million (US$4,729 million) in 2023, primarily due to the decrease in shipments, which was partially offset by the increased utilities costs.

Gross profit and gross margin. Gross profit decreased from NT$125,764 million in 2022 to NT$77,744 million (US$2,539 million) in 2023. Our gross margin decreased from 45.1% in 2022 to 34.9% in 2023, primarily due to the decrease in capacity utilization.

Operating income and operating margin. Operating income decreased from NT$104,292 million in 2022 to NT$57,891 million (US$1,891 million) in 2023. Our operating margin decreased from 37.4% in 2022 to 26.0% in 2023. The decrease in operating margin was largely due to the decrease in gross profit as described above. Operating expenses decreased by 11.0% from NT$26,812 million in 2022 to NT$23,856 million (US$779 million) in 2023.

Sales and marketing expenses. Our sales and marketing expenses decreased by 22.9% from NT$4,183 million in 2022 to NT$3,225 million (US$105 million) in 2023, mainly due to decrease of NT$689 million (US$22 million) in IP and IP royalty expenses and NT$380 million (US$12 million) in wafer sample expenses, partially offset by the increase of NT$193 million (US$6 million) in personnel expenses. Our sales and marketing expenses as a percentage of our operating revenues decreased from 1.5% in 2022 to 1.4% in 2023.

General and administrative expenses. Our general and administrative expenses decreased by 22.7% from NT$9,673 million in 2022 to NT$7,477 million (US$244 million) in 2023, mainly due to decrease of NT$1,578 million (US$52 million) in personnel expenses and NT$268 million (US$9 million) in professional fees. Our general and administrative expenses as a percentage of our operating revenues decreased from 3.5% in 2022 to 3.4% in 2023.

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Research and development expenses. Our research and development expenses increased by 2.6% from NT$12,953 million in 2022 to NT$13,284 million (US$434 million) in 2023. The increase in research and development expenses was mainly due to increase of NT$475 million (US$16 million) in research and development expenses of wafers, NT$259 million (US$8 million) in mask expenses and NT$134 million (US$4 million) in IP and IP royalty expenses, partially offset by the decrease NT$543 million (US$18 million) in personnel expenses. Our research and development expenses as a percentage of our operating revenues increased from 4.6% in 2022 to 6.0% in 2023.

Expected credit impairment gains (losses). Our expected credit impairment gains (losses) increased from NT$(3) million in 2022 to NT$130 million (US$4 million) in 2023. The increase in expected credit impairment gains (losses) was mainly due to the reversal of loss allowance on accounts receivable. Our expected credit impairment gains (losses) as a percentage of our operating revenues increased from (0.0)% in 2022 to 0.1% in 2023.

Net other operating income and expenses. Net other operating income decreased by 25.1% from NT$5,340 million in 2022 to NT$4,002 million (US$131 million) in 2023, mainly due to a decrease of NT$1,197 million (US$39 million) in government grants. Net other operating income and expenses as a percentage of our operating revenues decreased from 1.9% in 2022 to 1.8% in 2023.

Non-operating income and expenses. Non-operating income and expenses increased by 98.0% from a gain of NT$5,333 million in 2022 to NT$10,560 million (US$345 million) in 2023, mainly due to an increase in a gain of NT$2,831 million in interest income caused by higher average interest rate, an increase of NT$2,682 million in share of profit or loss of associates and joint ventures, and an increase in other gains and losses from a loss of NT$1,135 million in 2022 to a gain of NT$223 million (US$7 million) in 2023, partially offset by a decrease of NT$2,044 million in exchange gain, net. The increase in other gains and losses was resulted from an increase of NT$1,207 million on valuation of financial assets and liabilities at fair value through profit or loss from a loss of NT$1,248 million in 2022 to a loss of NT$41 million (US$1 million) in 2023.

Other comprehensive income (loss). Our other comprehensive income increased from an income of NT$4,192 million in 2022 to an income of NT$5,058 million (US$165 million) in 2023. We attributed this change primarily to the increase in unrealized gain (loss) from equity instruments investments measured at fair value through other comprehensive income from a loss of NT$4,717 million in 2022 to a gain of NT$5,287 million (US$173 million) in 2023, and 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 loss of NT$1,571 million in 2022 to a gain of NT$1,519 million (US$50 million) in 2023. These increases were partially offset by the decrease of exchange differences on translation of foreign operations from a gain of NT$10,176 million in 2022 to a loss of NT$2,000 million (US$65 million) in 2023.

Net income (loss) attributable to the shareholders of the parent. Due to the factors described above, our net income decreased by 33.3% from NT$89,479 million in 2022 to NT$59,689 million (US$1,949 million) in 2023.

Comprehensive income (loss) attributable to the shareholders of the parent. Due to the factors described above, our comprehensive income decreased by 30.9% from NT$93,671 million in 2022 to NT$64,747 million (US$2,115 million) in 2023.

Year Ended December 31, 2022 Compared to Year Ended December 31, 2021

For the comparison of our operating results for the year ended December 31, 2022 to the year ended December 31, 2021, please refer to “Item 5. Operating and Financial Review and Prospects—Operating Results—Comparisons of Results of Operations—Year Ended December 31, 2022 Compared to Year Ended December 31, 2021” of our annual report on Form 20-F filed with the Securities and Exchange Commission on April 27, 2023.

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.

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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. Operating cash inflows significantly exceed operating income, reflecting the significant non-cash depreciation expense.

As of December 31, 2023, we had NT$132,554 million (US$4,329 million) of cash and cash equivalents and NT$444 million (US$14 million) of current 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 0.14% to 0.21%, 0.43% to 0.62% and 0.71% to 0.85%, in 2021, 2022 and 2023, respectively. The terms of these agreements were typically less than one month. As of December 31, 2021, 2022 and 2023, we held repurchase agreements in the amount of NT$10,001 million, NT$5,923 million and NT$1,948 million (US$64 million), respectively.

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, 2023, NT$3,000 million aggregate principal amount of these bonds were outstanding.

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 is due and payable 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, 2023, NT$2,100 million aggregate principal amount of these bonds were outstanding.

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 is due and payable annually at 0.94%, and the principal was repaid in October 2022. The seven-year domestic unsecured corporate bond was issued in the amount of NT$3,400 million. Interest is due and payable 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, 2023, NT$3,400 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 is due and payable 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 is due and payable 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 is due and payable 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, 2023, 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, 2023, no bonds had been exchanged into common shares of Novatek and we have repurchased and cancelled the outstanding principal amount of exchangeable bonds totaling US$187 million in 2022.

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 is due and payable 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, 2023, NT$5,000 million aggregate principal amount of these bonds were outstanding.

In mid-September 2023, we issued another five-year domestic unsecured corporate bonds totaling NT$10,000 million, with a face value of NT$1 million per unit. Interest is due and payable annually at 1.62%, and the principal will be repayable in September 2028 upon maturity. The proceeds of this offering were used for green building. As of December 31, 2023, NT$10,000 million aggregate principal amount of these bonds were outstanding.

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Operating Activities

In 2023, net cash provided by operating activities was NT$86,000 million (US$2,809 million), primarily due to net income before income tax of NT$68,450 million (US$2,235 million) and the add-back of non-cash items, such as depreciation and amortization in the amount of NT$40,484 million (US$1,322 million).

In 2022, net cash provided by operating activities was NT$145,861 million, primarily due to net income before income tax of NT$109,626 million and the add-back of non-cash items, such as depreciation and amortization in the amount of NT$44,170 million.

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

Investing Activities

In 2023, net cash used in investing activities was NT$97,787 million (US$3,194 million), primarily due to cash used to purchase equipment at our fabs amounting to NT$91,474 million (US$2,987 million) and net increase of financial assets measured at amortized cost amounting to NT$5,617 million (US$183 million).

In 2022, net cash used in investing activities was NT$54,427 million, primarily due to cash used to purchase equipment at our fabs amounting to NT$80,128 million and partially offset by net decrease of financial assets measured at amortized cost amounting to NT$28,497 million.

In 2021, net cash used in investing activities was NT$62,163 million, primarily due to cash used to purchase equipment at our fabs amounting to NT$48,035 million and net increase in financial assets measured at amortized cost amounting to NT$15,009 million.

Financing Activities

In 2023, net cash used in financing activities was NT$29,086 million (US$950 million), primarily due to NT$45,015 million (US$1,470 million) for cash dividend payment and NT$21,209 million (US$693 million) for payment of other financial liabilities, partially offset by NT$17,388 million (US$568 million) due to net increase in bank loans, NT$10,423 million (US$340 million) due to net increase in guarantee deposits and NT$9,989 million (US$326 million) due to bonds issued.

In 2022, net cash used in financing activities was NT$57,255 million, primarily due to NT$37,445 million for cash distributed from additional paid-in capital and net decrease of bank loans of NT$20,782 million.

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

We had bonds payable of NT$38,359 million (US$1,253 million) in the aggregate as of December 31, 2023.

The following table sets forth our outstanding long-term bank loans as of December 31, 2023:

	Unsecured long-term bank loans				Secured long-term bank loans
	(in NT$ millions)		(in US$ millions)		(in NT$ millions)		(in US$ millions)
Due in 2024		2,003		66		224		7
Due in 2025		6,424		210		2,966		97
Due in 2026		1,421		46		2,492		81
Due in 2027		—		—		2,005		66
Due in 2028		800		26		1,825		60
Due in 2029 & thereafter		—		—		2,723		89

The interest rates of our long-term bank loans range from 1.67% to 6.56%.

As of December 31, 2023, the current or exchangeable portion of bonds due within one year was NT$13,780 million (US$450 million), and the current portion of long-term bank loans due within one year was NT$2,227 million (US$73 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, 2023, our construction contracts amounted to NT$70,583 million (US$2,305 million) and the portion of the contracts not yet recognized was approximately NT$38,364 million (US$1,253 million). In 2021, 2022 and 2023, we incurred capital expenditures of approximately NT$50,120 million, NT$82,420 million and NT$94,087 million (US$3,073 million), respectively, primarily to purchase equipment for research and development and production at our fabs.

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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 enter production ramp in first half of 2025. The new fab (Fab12i P3) will provide 40nm, 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’ investments. As of December 31, 2023, the total contractual cash obligations, including the amounts which has yet been recorded on our balance sheet as of December 31, 2023, are NT$233,867 million, among which NT$125,371 million will be due within 1 year and NT$108,496 million will be due after 1 year.

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

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$12,935 million, NT$12,953 million and NT$13,284 million (US$434 million) in 2021, 2022 and 2023, respectively, in research and development, which represented 6.1%, 4.6% and 6.0%, respectively, of operating revenues for such years. Following the Company’s operation and development planning, the Company’s IP division has formulated strategies and plans for the protection and development of intellectual property to promote the steady growth of the number of patent rights. Status on the implementations is reported to the board of directors at least once a year. The Company was granted a total of 425 domestic and foreign patents in 2023, 259 of which are US patents, 43 ROC (Taiwan) patents, 115 China patents, and 8 patents from the rest of the world. The total accumulated number of UMC’s patents is 15,196, which can provide a thorough and strong IP foundation for UMC’s technologies.

Our current research and development activities seek to optimize the use of available capacity by developing specialty technology 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. 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 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, 2024. 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		63	Chairman, Director and Chief Strategic Officer		32
SC Chien		66	Co-president and Director (Representative of Hsun Chieh Investment Co., Ltd.)		35
Jason Wang		61	Co-president and Director (Representative of Silicon Integrated Systems Corp.)		16
Lih J. Chen (1)		77	Independent Director		6
Jyuo-Min Shyu (1)		70	Independent Director		6
Wenyi Chu (1)		57	Independent Director		9
Kuang-Si Shiu (1)		72	Independent Director		3
Wen-Shin Hsu (1)		47	Independent Director		3
Ting-Yu Lin		62	Director		18
Chitung Liu		58	Chief Financial Officer, Senior Vice President and Head of Corporate Governance		23

(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 and strategic officer of Faraday Technology Corporation and Silicon Integrated Systems Corp., the chairman of Fortune Venture Capital Corp., TLC Capital Co. Ltd., UMC Capital Corp., a director of Triknight Capital Corporation and United Microelectronics (Europe) B.V. 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 institutional director of 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 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., United Microtechnology Corporation (California) and eJoule International Limited. 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 is also an independent director of Winmate Inc. and LeRain Technology Co. 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, a director of Cannan Cilai Co., Ltd., as well as a supervisor of The Promised Land Foundation, Yu Cheng Investment Co., Ltd. and Ti Mo Tai Investment 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 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 chairman of Sunrox International Inc., Sunrotek Corp., Sunrox Industries, 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 the chairman of Hejian Technology (Suzhou) Co., Ltd., United Semiconductor (Xiamen) Co., Ltd. and a director of Fortune Venture Capital Corp., TLC Capital Co., Ltd., Unimicron Technology Corp., Novatek Microelectronic Corp., Yann Yuan Investment Co., Ltd., UMC Group (USA), Green Earth Limited, ECP Vita Pte. Ltd., UMC Capital Corp. and United Microchip Corporation. 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 2023 were approximately NT$47.6 million (US$1.6 million). The remuneration was out of our 2023 earnings distribution plan, and the distribution percentage for directors is 0.08%. 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 2023 were approximately NT$1,598.7 million (US$52.2 million), which include NT$581.1 million (US$19 million) as bonus. The aggregate compensation paid and benefits in kind granted to our directors and senior management in 2023 were approximately NT$1,646.3 million (US$53.8 million), which include NT$581.1 million (US$19 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 http://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 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, 2023, we had 19,833 employees, which included 12,336 engineers, 6,662 technicians and 835 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.

	Years Ended December 31,
	2021		2022		2023
Employees
Engineers		11,606		12,390		12,336
Technicians		7,318		7,461		6,662
Administrative Staff		817		829		835
Total		19,741		20,680		19,833

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 27, 2024, our board of directors proposed an employee bonus in cash in the aggregate amount of NT$5,439 million (US$178 million) in relation to retained earnings in 2023.

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, 2024, 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 1, 2024, our most recent record date, Hsun Chieh Investment Co. held approximately 441 million of our common shares, representing approximately 3.52% of our issued and outstanding share capital; Silicon Integrated Systems Corp. held approximately 267 million of our common shares, representing approximately 2.13% of our issued and outstanding share capital; Chairman Mr. Hung held approximately 56 million of our common shares, representing approximately 0.45% 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.

F. Disclosure of a registrant’s action to recover erroneously awarded compensation.

On October 25, 2023, the Compensation Committee of our Board of Directors approved an Incentive Based Compensation Clawback Policy providing for the Company’s recoupment of recoverable incentive compensation that is received by covered Officers of the Company under certain circumstances, in compliance with Section 10D of the Exchange Act, Rule 10D-1 promulgated thereunder and NYSE Section 303A.14. See Exhibit 97.1 to this Annual Report. The Company has not recouped compensation, or attempted to recoup compensation, from any employee to date.

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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) April 1, 2024, 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 March 29, 2022			As of April 2, 2023			As of April 1, 2024
	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)		3.54	%		3.53	%		441,371,000		3.52	%
Silicon Integrated Systems Corp.		2.29	%		2.13	%		266,580,424		2.13	%
Directors and executive officers as a group		6.83	%		6.83	%		860,106,116		6.86	%

(1) 36.49% owned by United Microelectronics Corporation as of March 31, 2024.

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 April 1, 2024.

Name	Ownership %
Silicon Integrated Systems Corp.		19.02
Faraday Technology Corp.		13.80

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$2,816 million, NT$5,784 million and NT$3,022 million (US$99 million) of our operating revenues in 2021, 2022 and 2023, respectively, from the provision of our foundry services to these two companies. For more information of related party transactions, please refer to Note 7 to our audited consolidated financial statements included in this Annual Report.

C. Interests of Experts and Counsel

Not applicable.

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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.

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, and of Micron Memory Taiwan Co., Ltd. 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 January 27, 2024, UMC completed the probation period successfully and the sentence has been terminated.

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 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 application for injunctive procedure. On March 28, 2024, the court approved UMC’s withdrawal of actions and the application for injunctive procedure.

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.

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 May 27, 2022, our shareholders approved to distribute cash from additional paid-in capital of NT$3.0 per common share for an aggregate of NT$37,446,370,452. On May 31, 2023, our shareholders approved a cash dividend of NT$3.60 per common share for an aggregate of NT$45,017,096,342. On June 7, 2023, our board of directors resolved to adjust the cash dividend ratio to NT$3.60046348 per common share because the number of outstanding common shares had changed as a result of cancellation of Restricted Stock Awards. On February 27, 2024, our board of directors proposed dividends of NT$37,587,101,925 (approximately NT$3.0 per common share), which are expected to be approved at our annual general meeting on May 30, 2024.

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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.

	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
2023		3.60046348		—		—		12,529,822,160

(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, 2024, there were a total of 121,465,643 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, 2024, 607,328,215 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, 2024, 121,449,668 ADSs representing these 607,248,340 common shares were held of record by Cede & Co., and 15,975 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.

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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.

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, 2024, 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, 2024, 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.”

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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.

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, 2023, our authorized share capital was NT$260 billion, divided into 26 billion common shares, of which 12,529,822,160 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, 2024.

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.

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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

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

For the restricted share awards approved by the Board of Directors in 2022, the following performance indicators will be used as operational goals for the Company: return on equity % (ROE%), operating margin % (OM%) and Morgan Stanley Capital International (MSCI) ESG ratings. The performance targets and weighting for the indicators are listed below. Indicators that have achieved the target value, the number of vested shares in the year is calculated according to the corresponding weighting, otherwise, the corresponding weighting is 0%. The performance period refers to the fiscal year of the most recent annual financial statement audited by a certified public accountant before the vesting date. Performance indicators are based on the consolidated financial statements audited by a certified public accountant corresponding to the period required by the indicators.

Effective Date of Equity Based Compensation: October 6, 2022

Effective Date of Share Distribution: December 5, 2022

Equity Based Compensation Shares: 23.0595 million shares

Effective Date of Share Distribution: December 5, 2023

Equity Based Compensation Shares: 26.7275 million shares

Indicator	Weighting	Target
Return on Equity (ROE%)	30%	Higher than the Company’s average of the previous three years (Note 1)
Earnings Per Share (EPS)	30%	Higher than the Company’s average of the previous three years (Note 1)
Morgan Stanley Capital International (MSCI) ESG rating	40%	Rating is A or greater (Note 2)

Note 1. Comparing the performance period with the average of the preceding three years

Note 2. The year of MSCI annual ESG rating is consistent with the performance period defined in the return on equity and earnings per share.

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.

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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.

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.

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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.

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.

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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.

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. 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 2021, 2022, and 2023, we did not purchase any of our common shares, and transfer such common shares that we repurchased under these plans to our employees as employee compensation.

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

UMC maintains long-term business relationship with major wafer material supplier. The main contract is as follow:

Contract Type	Contracted Party	Contract Period	Key Content	Restrictive Clause
Purchase	Shin-Etsu Handotai Taiwan Co., Ltd.	Indefinite	Wafer material supply	None

Development Collaboration

Contract Type	Contracted Party	Contract Period	Key Content	Restrictive Clause
Development Collaboration	Intel Inc.	Jan. 25, 2024~ Jan. 24, 2034	UMC and Intel announce a collaboration on a development of a 12nm semiconductor process platform	Duty of confidentiality

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Patent and Technology Licenses

UMC values and protects intellectual property rights. With over 40 years of commitment to developing and securing 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. 08, 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 Department of Investment Review, 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. 05, 2019	License for specific patents.	None
Technology license	United Semiconductor (Xiamen) Co., Ltd.	Apr. 01, 2017~ Mar. 31, 2032	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 Department of Investment Review, 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 Department of Investment Review, 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., Mega Union Technology Inc. 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 NT$13.25 billion.	None
Construction	ECOVE Environment Services Corporation	From Jan., 2023	For building the solvent treatment facilities of Fab 12A in the Southern Taiwan Science Park, UMC signed construction contracts with the vendor listed in the second column. The total contracted amount exceeded NT$683 million.	None
Construction	Chenya Power Co., Ltd., Holdgood Energy Co., Ltd	From Jan., 2024	For procuring the solar photovoltaic systems, UMC signed construction contracts with the vendors listed in the second column. The total contracted amount exceeded NT$5.39 billion.	None
Construction	Rsea Constructional Engineering (Chongqing) Co., Ltd., L&K Engineering (Suzhou) Co., Ltd.	From Feb., 2022~ Mar., 2023	For the WH3 warehouse, HeJian Technology (Suzhou) Co., Ltd. entered into construction contracts with the vendors listed in the second column. The total contracted amount exceeded RMB¥50.28 million.	None

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 Department of Investment Review of the R.O.C. Ministry of Economic Affairs (formerly known as 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.

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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.

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 Department of Investment Review 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 Department of Investment Review 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 Department of Investment Review 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 Department of Investment Review 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.

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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.

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 Department of Investment Review 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.

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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.

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. 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.

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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, Saudi Arabia, and Republic of Korea (South Korea) 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.

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.

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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);

• 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.

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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.

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.

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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.

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.

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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.

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.

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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.

The following table provides information as of December 31, 2023 on our market risk sensitive financial instruments.

	As of December 31, 2023
	Carrying Amount		Fair Amount
	(in NT$ millions)
Time Deposits		86,630		86,630
Accounts Receivable (denominated in foreign currency)		21,387		21,387
Accounts Payable (denominated in foreign currency)		3,654		3,654
Bonds Payable		38,359		38,367
Long-term Loans		22,883		22,883

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, 2023 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, 2023
	2024			2025			2026			2027			2028 and thereunder			Total			Fair Value
	(in millions, except percentages)
Time Deposits:
Fixed Rate (US$)		2,033															2,033			2,033
Average Interest Rate		5.11	%														5.11	%		5.11	%
Fixed Rate (SGD)
Average Interest Rate
Fixed Rate (RMB¥)
Average Interest Rate
Fixed Rate (NT$)		1,250															1,250			1,250
Average Interest Rate		0.95	%														0.95	%		0.95	%
Short-term Loans:
Variable Rate (US$)
Average Interest Rate
Variable Rate (NT$)		13,530															13,530			13,530
Average Interest Rate		2.26	%														2.26	%		2.26	%
Variable Rate (€)
Average Interest Rate
Variable Rate (¥ JPY)
Average Interest Rate
Variable Rate (RMB¥)
Average Interest Rate
Unsecured Long-term Loans:
Variable Rate (NT$)		1,666			5,667			1,000						800			9,133			9,133
Average Interest Rate		1.69	%		1.70	%		1.67	%					1.86	%		1.71	%		1.71	%
Variable Rate (US$)		11			25			14									50			50
Average Interest Rate		6.56	%		6.56	%		6.56	%								6.56	%		6.56	%
Variable Rate (RMB¥)
Average Interest Rate
Secured Long-term Loans:
Variable Rate (NT$)		106			125			124			63			49			467			467
Average Interest Rate		2.50	%		2.53	%		2.59	%		2.60	%		2.71	%		2.57	%		2.57	%
Variable Rate (US$)
Average Interest Rate
Variable Rate (RMB¥)		27			653			544			446			1,033			2,703			2,703
Average Interest Rate		3.20	%		3.20	%		3.20	%		3.20	%		3.20	%		3.20	%		3.20	%
Bonds:
Unsecured (NT$)		3,000															3,000			3,007
Fixed Rate		1.95	%														1.95	%		1.95	%
Unsecured (NT$)		2,100															2,100			2,100
Fixed Rate		1.43	%														1.43	%		1.43	%
Unsecured (NT$)		3,400															3,400			3,418
Fixed Rate		1.13	%														1.13	%		1.13	%
Unsecured (NT$)								5,500									5,500			5,380
Fixed Rate								0.57	%								0.57	%		0.57	%
Unsecured (NT$)								5,000									5,000			4,869
Fixed Rate								0.63	%								0.63	%		0.63	%
Unsecured (NT$)														2,000			2,000			2,000
Fixed Rate														0.63	%		0.63	%		0.63	%
Unsecured (NT$)														2,100			2,100			2,100
Fixed Rate														0.68	%		0.68	%		0.68	%
Unsecured (NT$)														10,000			10,000			9,954
Fixed Rate														1.62	%		1.62	%		1.62	%

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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, 2023, 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, 2023.

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

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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;

• 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 2023, pursuant to the terms of the deposit agreement, we received reimbursement of US$1.3 million from JPMorgan Chase & Co., the depositary for our ADR program through December 31, 2023. 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

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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, 2023, 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, 2023.

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, 2023 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, 2023 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, 2023, which is included immediately following this report.

Changes in Internal Control over Financial Reporting

During 2023, there was no material change to our internal control over financial reporting.

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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, 2023, 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, 2023, 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, 2022 and 2023, 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, 2023, and the related notes (collectively referred to as the “consolidated financial statements”) and our report dated April 25, 2024 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.

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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 25, 2024

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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/Employee_Code_of_Conduct-e.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,
	2022		2023
	NT$		NT$		US$
	(in thousands)
Audit Fees (1)		61,540		65,829		2,150
Audit-related Fees (2)		3,367		5,279		172
Tax Fees (3)		3,785		10,035		328
Total		68,692		81,143		2,650

(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 19^th 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 20^th 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 21^st 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.

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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.

ITEM 16I. DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

Not applicable.

ITEM 16J. INSIDER TRADING POLICIES

Not applicable.

ITEM 16K. CYBERSECURITY

Risk management and strategy

The assessment, identification and management of material risks from cybersecurity threats are integrated into the Company’s overall risk management processes. The Enterprise Information Security Committee (EISC) is responsible for assessing the risk level of information security and cybersecurity, taking appropriate actions and regularly reviewing the effectiveness of these actions. Cybersecurity risks and related matters are reported to the Enterprise Risk Management Committee, which manages and provide oversight of overall enterprise risk, regularly review the possibility of risk occurrence and the potential change of severity over time, and to understand and assess the effectiveness of risk management programs and related control operations.

We engage third parties in connection with such information security risk management processes. We strengthened our information security process and cybersecurity risk management by introducing information security management system certification such as ISO27001, ISO15408, etc. to reduce security risk and production anomaly. Continuous improvement is then carried out through annual recertification audit by third parties. We also conduct regular penetration tests by third parties as well as reinforcements and repairs to reduce information security risks.

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We have established processes to oversee and identify risks from cybersecurity threats associated with use of any third-party service provider. We also built a comprehensive multi-layer defense mechanism including firewall, intrusion detection, antivirus system, vulnerability scanning, patch management procedure and penetration testing. While using third-party service, we have implemented information security and cybersecurity management measures, including encrypting data, and tracing logs, to achieve effective information protection.

The risks from cybersecurity threats may not only expose the Company to the risks of data leakage and ransom threats, but may also interrupt the production system, causing serious operating losses or even damaging the reputation of the Company. In response to previous cybersecurity incidents and potential cyber-attacks, we have enhanced cybersecurity protection mechanisms such as upgrading the antivirus software with behavior-based detection capability and implemented strict information device in/out management to minimize potential impact. We also obtained information security insurance since 2019 as one of the measures to mitigate information security risks. Besides, we joined SEMICON TAIWAN cybersecurity committee to contribute as a local enterprise responsibility.

Governance

UMC’s information security and cybersecurity policy, which is deployed in the Company and its subsidiaries, is based on the following principles: 1) To establish Information Security Management rules in accordance to customer requirements, 2) to reach a consensus that information security is everyone’s responsibility through full awareness, 3) to protect information confidentiality, integrity, availability for the Company and customers, and 4) to provide a safe production environment to ensure sustainable operation of the Company’s business. The major information security and cybersecurity objectives are aimed at antivirus, anti-intrusion and anti-leakage through the building of multiple internal controls such as firewalls, intrusion detection, and antivirus systems to enhance the Company’s ability to defend against external attacks and to protect internal confidential information. UMC’s written information security and cybersecurity policy please refer to the UMC website: http://www.umc.com/en/Html/information_security_risk_management.

The EISC is responsible for implementing the Company’s information security management plan, establishing and maintaining the information security management system, and coordinating the formulation and compliance of related policies. The EISC management objectives include assessing, identifying and managing material risks from cybersecurity threats, and being informed about and monitor the prevention, detection, mitigation, and remediation of cybersecurity incidents through building the multi-layer information security protection mechanism. The Information Security Technology task members of the EISC have relevant expertise in information security such as network management, system management, database management, application development, and information security protection.

The Vice President of Digital Function organization serves as Chief Information Security Officer (CISO) of EISC, and is responsible for establishing and maintaining the information security/cyber security strategy and processes that protect information assets. The EISC holds semiannual meetings to review information security risks and measures and strategies adopted by UMC, ensuring the adequacy, suitability and effectiveness of the Company’s information security management system. The EISC reports to the board of directors on the effectiveness of the information security strategy annually. Independent Board Director Jyuo-Min Shyu, who has relevant experience in information security, oversees and regularly reviews the Company’s information security and cyber security strategy.

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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: 1443)		F-2
Consolidated Balance Sheets as of December 31, 2022 and 2023		F-4
Consolidated Statements of Comprehensive Income for the years ended December 31, 2021, 2022 and 2023		F-5
Consolidated Statements of Changes in Equity for the years ended December 31, 2021, 2022 and 2023		F-6
Consolidated Statements of Cash Flows for the years ended December 31, 2021, 2022 and 2023		F-9
Notes to the Consolidated Financial Statements		F-11

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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)
2.3	Description of Securities Registered Under Section 12 of the Exchange Act (17)
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)
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)

84

Exhibit Number	Description of Exhibits
*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
*15.1	Consent of Independent Registered Public Accounting Firm
*97.1	Policy Relating to Recovery of Erroneously Awarded Compensation
*101.INS	Inline XBRL Instance Document. the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
*101.SCH	Inline XBRL Taxonomy Extension Schema Document
*101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document
*101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document
*101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document
*101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document
*104	Cover Page Interactive Data File (embedded within the inline XBRL 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.

(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.

85

(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 this Annual Report on Form 20-F for the fiscal year ended December 31, 2023.

(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:  Chief Financial Officer and Senior Vice President

Date: April 25, 2024

87

United Microelectronics Corporation and Subsidiaries

Consolidated Financial Statements for years ended December 31, 2021, 2022 and 2023

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, 2022 and 2023, 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, 2023, 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, 2022 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, 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, 2023, 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 25, 2024 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, 2023, the Company’s net inventories amounted to NT$35,713 million. As the semiconductor industry is characterized by rapid changes in technology, management has 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 25, 2024

F-3

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

As of December 31, 2022 and 2023

(Expressed in Thousands, Except for Par Value)

			As of December 31,
	Notes		2022			2023
			NT$			NT$			US$
Assets
Current assets
Cash and cash equivalents		4, 6(1)		173,818,777			132,553,615			4,328,988
Financial assets at fair value through profit or loss, current		4, 5, 6(2)		705,918			443,601			14,487
Financial assets at fair value through other comprehensive income, current		4, 5, 6(3)		3,213,057			5,753,379			187,896
Financial assets measured at amortized cost, current		4, 6(4)		861,817			6,131,077			200,231
Contract assets, current		4, 6(21)		373,318			739,528			24,152
Accounts receivable, net		4, 6(5)		36,444,510			29,237,550			954,851
Accounts receivable-related parties, net		4, 7		530,577			347,964			11,364
Other receivables		4		1,807,999			2,707,400			88,419
Current tax assets		4		40,256			130,123			4,250
Inventories, net		4, 5, 6(6)		31,069,960			35,712,558			1,166,315
Other current assets		6(21)		3,504,849			3,040,597			99,301
Total current assets				252,371,038			216,797,392			7,080,254
Non-current assets
Financial assets at fair value through profit or loss, noncurrent		4, 5, 6(2), 7		17,784,651			16,694,860			545,227
Financial assets at fair value through other comprehensive income, noncurrent		4, 5, 6(3)		11,976,543			11,930,581			389,634
Financial assets measured at amortized cost, noncurrent		4, 6(4)		7,491			222,691			7,273
Investments accounted for under the equity method		4, 6(7), 7		26,504,913			32,785,800			1,070,731
Property, plant and equipment		4, 6(8), 8		170,982,066			239,123,248			7,809,381
Right-of-use assets		4, 6(9), 8		7,611,991			7,000,355			228,620
Intangible assets		4, 6(10), 7		4,275,200			4,372,555			142,801
Deferred tax assets		4, 6(26)		5,226,236			5,130,411			167,551
Prepayment for equipment				19,439,559			4,725,583			154,330
Refundable deposits		8		2,749,691			2,708,823			88,466
Other noncurrent assets				5,716,204			5,084,533			166,053
Total non-current assets				272,274,545			329,779,440			10,770,067
Total assets				524,645,583			546,576,832			17,850,321
Liabilities and Equity
Current liabilities
Short-term loans		6(11), 6(28)		—			13,530,000			441,868
Financial liabilities at fair value through profit or loss, current		4, 6(12)		438,397			1,019,362			33,291
Contract liabilities, current		4, 6(21)		3,546,815			3,250,712			106,163
Accounts payable				8,982,418			7,526,159			245,792
Other payables		4, 6(20), 6(22), 7		31,279,208			25,670,984			838,373
Payables on equipment				18,632,245			19,196,256			626,919
Current tax liabilities		4		19,450,909			9,539,764			311,553
Lease liabilities, current		4, 6(9), 6(28)		537,314			514,324			16,797
Other financial liabilities, current		6(28), 9(6)		17,226,490			—			—
Current portion of long-term liabilities		4, 6(13), 6(14), 6(28)		7,586,644			16,006,797			522,756
Other current liabilities		4, 6(16), 6(17), 6(18), 6(28), 7		4,928,283			5,642,792			184,285
Total current liabilities				112,608,723			101,897,150			3,327,797
Non-current liabilities
Contract liabilities, noncurrent		4, 6(21)		438,188			430,640			14,064
Bonds payable		4, 6(13), 6(28)		23,083,096			24,579,651			802,732
Long-term loans		6(14), 6(28)		16,794,289			20,656,248			674,600
Deferred tax liabilities		4, 6(26)		3,562,436			5,631,964			183,931
Lease liabilities, noncurrent		4, 6(9), 6(28)		5,199,781			4,878,863			159,336
Net defined benefit liabilities, noncurrent		4, 6(15)		2,869,402			2,205,085			72,014
Guarantee deposits		6(28)		30,518,585			40,122,956			1,310,351
Other noncurrent liabilities		4, 6(16), 6(18), 6(20), 6(28), 9(6)		6,760,135			2,457,307			80,252
Total non-current liabilities				89,225,912			100,962,714			3,297,280
Total liabilities				201,834,635			202,859,864			6,625,077
Commitments and contingencies		9
Equity attributable to the parent company
Capital		4, 6(19)
Common stock - NT$10 par value				125,047,490			125,298,222			4,092,039
Authorized: 26,000,000 thousand shares
Issued: 12,504,749 thousand shares as of December 31, 2022
Issued: 12,529,822 thousand shares as of December 31, 2023
Additional paid-in capital		4, 6(19), 6(20)
Premiums				3,215,160			3,997,662			130,557
Treasury stock transactions				7,425,869			8,277,564			270,332
Transactions with noncontrolling interests				534,109			3,156,983			103,102
Share-based payment				2,221,709			2,373,830			77,526
Other				1,746,172			19,396			633
Retained earnings		6(19)
Legal reserve				21,566,986			30,472,125			995,171
Special reserve				4,914,214			2,734,058			89,290
Unappropriated earnings				169,725,371			176,391,220			5,760,653
Other components of equity		4, 6(20)
Exchange differences on translation of foreign operations				(6,369,416	)		(8,439,670	)		(275,626	)
Unrealized gains or losses on financial assets measured at fair value through other comprehensive income				2,892,583			10,889,828			355,644
Unearned employee compensation				(1,831,030	)		(1,991,331	)		(65,033	)
Treasury stock		4, 6(19)		(8,621,948	)		(9,803,778	)		(320,176	)
Total equity attributable to the parent company				322,467,269			343,376,109			11,214,112
Non-controlling interests		6(19)		343,679			340,859			11,132
Total equity				322,810,948			343,716,968			11,225,244
Total liabilities and equity				524,645,583			546,576,832			17,850,321

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, 2021, 2022 and 2023

(Expressed in Thousands, Except for Earnings per Share)

			For the years ended December 31,
	Notes		2021			2022			2023
			NT$			NT$			NT$			US$
Operating revenues		4, 6(21), 7		213,011,018			278,705,264			222,533,000			7,267,570
Operating costs		4, 6(6), 6(10), 6(15), 6(20), 6(21), 6(22), 7		(140,961,389	)		(152,940,887	)		(144,789,162	)		(4,728,581	)
Gross profit				72,049,629			125,764,377			77,743,838			2,538,989
Operating expenses		4, 6(5), 6(10), 6(15), 6(20), 6(22), 7
Sales and marketing expenses				(4,671,599	)		(4,182,929	)		(3,225,154	)		(105,328	)
General and administrative expenses				(7,989,860	)		(9,672,613	)		(7,477,037	)		(244,188	)
Research and development expenses				(12,934,836	)		(12,953,534	)		(13,283,830	)		(433,829	)
Expected credit impairment gains (losses)				6,121			(2,723	)		130,518			4,263
Subtotal				(25,590,174	)		(26,811,799	)		(23,855,503	)		(779,082	)
Net other operating income and expenses		4, 6(16), 6(23)		5,226,831			5,339,647			4,002,326			130,709
Operating income				51,686,286			104,292,225			57,890,661			1,890,616
Non-operating income and expenses
Interest income		4		575,719			2,022,314			4,853,124			158,495
Other income		4		1,653,006			2,163,043			1,773,498			57,920
Other gains and losses		4, 6(24)		866,130			(1,134,540	)		223,096			7,286
Finance costs		6(24)		(1,962,930	)		(1,866,329	)		(1,570,374	)		(51,286	)
Share of profit or loss of associates and joint ventures		4, 6(7)		5,193,495			1,626,103			4,307,614			140,680
Bargain purchase gain in acquisition of equity investee		4, 6(7)		—			—			494,001			16,133
Exchange gain, net		4		484,726			2,522,844			478,784			15,636
Subtotal				6,810,146			5,333,435			10,559,743			344,864
Income from continuing operations before income tax				58,496,432			109,625,660			68,450,404			2,235,480
Income tax expense		4, 6(26)		(7,918,252	)		(19,326,895	)		(8,311,270	)		(271,433	)
Net income				50,578,180			90,298,765			60,139,134			1,964,047
Other comprehensive income (loss)		6(25)
Items that will not be reclassified subsequently to profit or loss
Remeasurements of defined benefit pension plans		4, 6(15)		(197,477	)		296,804			402,234			13,136
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		4		5,811,342			(4,646,064	)		5,530,359			180,612
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss				2,959,130			(1,694,965	)		1,610,116			52,584
Income tax related to items that will not be reclassified subsequently		4, 6(26)		(417,076	)		(6,999	)		(414,395	)		(13,533	)
Subtotal				8,155,919			(6,051,224	)		7,128,314			232,799
Items that may be reclassified subsequently to profit or loss
Exchange differences on translation of foreign operations				(4,741,016	)		9,292,308			(2,386,278	)		(77,932	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss				(24,412	)		91,442			(74,418	)		(2,430	)
Income tax related to items that may be reclassified subsequently		4, 6(26)		29,938			859,566			390,428			12,751
Subtotal				(4,735,490	)		10,243,316			(2,070,268	)		(67,611	)
Total other comprehensive income (loss)				3,420,429			4,192,092			5,058,046			165,188
Total comprehensive income (loss)				53,998,609			94,490,857			65,197,180			2,129,235
Net income (loss) attributable to:
Shareholders of the parent				51,246,425			89,478,805			59,688,950			1,949,345
Non-controlling interests				(668,245	)		819,960			450,184			14,702
				50,578,180			90,298,765			60,139,134			1,964,047
Comprehensive income (loss) attributable to:
Shareholders of the parent				54,666,873			93,670,889			64,747,010			2,114,533
Non-controlling interests				(668,264	)		819,968			450,170			14,702
				53,998,609			94,490,857			65,197,180			2,129,235
Earnings per share (NTD)		4, 6(27)
Earnings per share-basic				4.27			7.40			4.92			0.16
Earnings per share-diluted				4.19			7.16			4.82			0.16

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, 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) 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-6

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

For the year ended December 31, 2022

(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, 2022		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
Impact of retroactive applications		—		—			—		—			(153,843	)		—			—			—			—			(153,843	)		(66,089	)		(219,932	)
Adjusted balance as of January 1, 2022		124,832,476		50,080,596			15,734,416		8,164,648			83,001,915			(16,612,724	)		9,201,181			(2,212,441	)		(8,192,044	)		263,998,023			157,092			264,155,115
Appropriation and distribution of 2021 retained earnings
Legal reserve		—		—			5,832,570		—			(5,832,570	)		—			—			—			—			—			—			—
Special reserve reversed		—		—			—		(3,250,434	)		3,250,434			—			—			—			—			—			—			—
Cash distributed from additional paid-in capital		—		(37,446,370	)		—		—			—			—			—			—			—			(37,446,370	)		—			(37,446,370	)
Net income for the year ended December 31, 2022		—		—			—		—			89,478,805			—			—			—			—			89,478,805			819,960			90,298,765
Other comprehensive income (loss) for the year ended December 31, 2022		—		—			—		—			258,171			10,243,308			(6,309,395	)		—			—			4,192,084			8			4,192,092
Total comprehensive income (loss)		—		—			—		—			89,736,976			10,243,308			(6,309,395	)		—			—			93,670,889			819,968			94,490,857
Share-based payment transaction		215,014		755,313			—		—			(1,490	)		—			—			381,411			—			1,350,248			1,490			1,351,738
Share of changes in net assets of associates and joint ventures accounted for using equity method		—		55,392			—		—			(797	)		—			797			—			—			55,392			—			55,392
Changes in subsidiaries’ ownership		—		—			—		—			(429,097	)		—			—			—			—			(429,097	)		(1,339	)		(430,436	)
Adjustments due to reciprocal stockholdings held by subsidiaries and associates		—		635,761			—		—			—			—			—			—			(429,904	)		205,857			—			205,857
Non-Controlling Interests		—		—			—		—			—			—			—			—			—			—			5,456			5,456
Others		—		1,062,327			—		—			—			—			—			—			—			1,062,327			(638,988	)		423,339
Balance as of December 31, 2022		125,047,490		15,143,019			21,566,986		4,914,214			169,725,371			(6,369,416	)		2,892,583			(1,831,030	)		(8,621,948	)		322,467,269			343,679			322,810,948

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, 2023

(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, 2023		125,047,490		15,143,019			21,566,986		4,914,214			169,725,371			(6,369,416	)		2,892,583			(1,831,030	)		(8,621,948	)		322,467,269			343,679			322,810,948
Appropriation and distribution of 2022 retained earnings
Legal reserve		—		—			8,905,139		—			(8,905,139	)		—			—			—			—			—			—			—
Special reserve reversed		—		—			—		(2,180,156	)		2,180,156			—			—			—			—			—			—			—
Cash dividends		—		—			—		—			(45,017,096	)		—			—			—			—			(45,017,096	)		—			(45,017,096	)
Net income for the year ended December 31, 2023		—		—			—		—			59,688,950			—			—			—			—			59,688,950			450,184			60,139,134
Other comprehensive income (loss) for the year ended December 31, 2023		—		—			—		—			327,156			(2,070,254	)		6,801,158			—			—			5,058,060			(14	)		5,058,046
Total comprehensive income (loss)		—		—			—		—			60,016,106			(2,070,254	)		6,801,158			—			—			64,747,010			450,170			65,197,180
Share-based payment transaction		250,732		934,945			—		—			(5,170	)		—			—			(160,301	)		—			1,020,206			5,817			1,026,023
Share of changes in net assets of associates and joint ventures accounted for using equity method		—		46,265			—		—			403,488			—			(432,357	)		—			—			17,396			—			17,396
Disposal of investments accounted for under the equity method		—		5			—		—			(56	)		—			56			—			—			5			—			5
The differences between the fair value of the consideration paid or received from acquiring or disposing subsidiaries and the carrying amounts of the subsidiaries		—		2,572,818			—		—			—			—			—			—			—			2,572,818			—			2,572,818
Changes in subsidiaries’ ownership		—		3,485			—		—			(292,225	)		—			—			—			—			(288,740	)		456			(288,284	)
Adjustments due to reciprocal stockholdings held by subsidiaries and associates		—		851,695			—		—			(85,827	)		—			—			—			(1,181,830	)		(415,962	)		—			(415,962	)
Disposal of equity instruments investments measured at fair value through other comprehensive income		—		—			—		—			(1,628,388	)		—			1,628,388			—			—			—			—			—
Non-Controlling Interests		—		—			—		—			—			—			—			—			—			—			4,187			4,187
Others		—		(1,726,797	)		—		—			—			—			—			—			—			(1,726,797	)		(463,450	)		(2,190,247	)
Balance as of December 31, 2023		125,298,222		17,825,435			30,472,125		2,734,058			176,391,220			(8,439,670	)		10,889,828			(1,991,331	)		(9,803,778	)		343,376,109			340,859			343,716,968

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, 2021, 2022 and 2023

(Expressed in Thousands)

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$			US$
Cash flows from operating activities:
Net income before tax		58,496,432			109,625,660			68,450,404			2,235,480
Adjustments to reconcile net income before tax to net cash provided by operating activities:
Depreciation		44,179,632			41,328,374			37,757,556			1,233,101
Amortization		2,894,942			2,841,334			2,726,481			89,043
Expected credit impairment losses (gains)		(6,121	)		2,723			(130,518	)		(4,263	)
Net loss (gain) of financial assets and liabilities at fair value through profit or loss		(2,892,470	)		1,247,962			40,553			1,324
Interest expense		1,868,089			1,785,311			1,473,729			48,130
Interest income		(575,719	)		(2,022,314	)		(4,853,124	)		(158,495	)
Dividend income		(1,653,006	)		(2,163,043	)		(1,773,498	)		(57,920	)
Share-based payment		1,745,745			1,351,738			1,031,896			33,700
Share of profit of associates and joint ventures		(5,193,495	)		(1,626,103	)		(4,307,614	)		(140,680	)
Gain on disposal of property, plant and equipment		(143,735	)		(482,983	)		(268,293	)		(8,762	)
Loss (gain) on disposal of investments accounted for under the equity method		16,388			(50,553	)		(163,395	)		(5,336	)
Loss on repurchases of bonds		—			203,851			—			—
Exchange loss (gain) on financial assets and liabilities		(505,434	)		2,436,159			85,353			2,788
Bargain purchase gain in acquisition of equity investee		—			—			(494,001	)		(16,133	)
Loss (gain) on lease modification		6			(1,162	)		(113	)		(4	)
Amortization of deferred government grants		(4,069,055	)		(4,163,746	)		(2,663,843	)		(86,997	)
Others		243,447			—			—			—
Income and expense adjustments		35,909,214			40,687,548			28,461,169			929,496
Changes in operating assets and liabilities:
Financial assets and liabilities at fair value through profit or loss		119,904			14,825			1,945,525			63,538
Contract assets		(81,887	)		(47,842	)		(381,105	)		(12,446	)
Notes receivable and accounts receivable		(8,590,622	)		(1,115,482	)		7,201,939			235,204
Other receivables		134,111			(914,736	)		(526,223	)		(17,186	)
Inventories		(871,589	)		(7,637,528	)		(4,944,756	)		(161,488	)
Other current assets		(227,852	)		(4,041,038	)		939,912			30,696
Contract fulfillment costs		(71,828	)		(97,027	)		(164,316	)		(5,366	)
Contract liabilities		1,637,105			(252,594	)		(267,858	)		(8,748	)
Accounts payable		688,652			490,949			(1,341,114	)		(43,799	)
Other payables		4,092,040			9,230,484			(5,683,081	)		(185,600	)
Other current liabilities		(506,837	)		791,279			1,470,483			48,023
Net defined benefit liabilities		(482,809	)		(711,115	)		(262,084	)		(8,559	)
Other noncurrent liabilities		71,430			(8,039	)		(89,593	)		(2,926	)
Cash generated from operations		90,315,464			146,015,344			94,809,302			3,096,319
Interest received		505,379			1,852,783			4,579,972			149,575
Dividend received		3,006,829			4,132,529			3,649,805			119,197
Interest paid		(1,539,069	)		(1,422,337	)		(1,027,500	)		(33,557	)
Income tax paid		(1,936,712	)		(4,717,790	)		(16,011,870	)		(522,922	)
Net cash provided by operating activities		90,351,891			145,860,529			85,999,709			2,808,612
Cash flows from investing activities:
Acquisition of financial assets at fair value through profit or loss		(921,916	)		(1,041,792	)		(1,182,248	)		(38,610	)
Proceeds from disposal of financial assets at fair value through profit or loss		439,145			773,318			525,237			17,153
Acquisition of financial assets measured at amortized cost		(37,141,310	)		(1,682,788	)		(6,296,321	)		(205,628	)
Proceeds from redemption of financial assets measured at amortized cost		22,132,639			30,179,933			678,907			22,172
Proceeds from disposal of investments accounted for under the equity method		—			—			293,266			9,578
Proceeds from capital reduction of investments accounted for under the equity method		—			—			1,303,106			42,557
Increase in prepayment for investments		(5,025	)		—			—			—
Proceeds from capital reduction of financial assets at fair value through other comprehensive income		42,150			—			—			—
Disposal of subsidiary		714,358			—			—			—
Acquisition of property, plant and equipment		(48,034,633	)		(80,127,628	)		(91,473,668	)		(2,987,383	)
Proceeds from disposal of property, plant and equipment		216,314			669,282			323,385			10,561
Increase in refundable deposits		(274,015	)		(558,491	)		(44,100	)		(1,440	)
Decrease in refundable deposits		220,750			186,175			83,856			2,739
Acquisition of intangible assets		(1,924,924	)		(2,756,155	)		(2,546,516	)		(83,165	)
Government grants related to assets acquisition		2,498,984			173,909			591,086			19,304
Increase in other noncurrent assets		(125,917	)		(243,084	)		(42,532	)		(1,389	)
Decrease in other noncurrent assets		—			55			—			—
Net cash used in investing activities		(62,163,400	)		(54,427,266	)		(97,786,542	)		(3,193,551	)

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, 2021, 2022 and 2023

(Expressed in Thousands)

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$			US$
Cash flows from financing activities:
Increase in short-term loans		7,205,015			228,980			29,120,960			951,044
Decrease in short-term loans		(16,179,231	)		(2,194,664	)		(15,590,960	)		(509,176	)
Cash payments for the principal portion of the lease liability		(699,680	)		(712,854	)		(666,439	)		(21,765	)
Proceeds from bonds issued		25,760,800			—			10,000,000			326,584
Bonds issuance costs		(57,108	)		—			(10,755	)		(351	)
Redemption of bonds		(2,000,000	)		(13,305,050	)		—			—
Proceeds from long-term loans		15,560,661			2,319,371			15,416,130			503,466
Repayments of long-term loans		(11,472,124	)		(21,135,630	)		(11,558,426	)		(377,480	)
Increase in guarantee deposits		14,812,963			15,823,396			11,651,109			380,506
Decrease in guarantee deposits		(593,555	)		(838,455	)		(1,227,764	)		(40,097	)
Decrease in other financial liabilities		—			—			(21,209,443	)		(692,666	)
Cash dividends and cash distributed from additional paid-in capital		(19,871,129	)		(37,445,300	)		(45,014,783	)		(1,470,110	)
Change in non-controlling interests		23,430			5,456			4,187			137
Others		65			—			—			—
Net cash provided by (used in) financing activities		12,490,107			(57,254,750	)		(29,086,184	)		(949,908	)
Effect of exchange rate changes on cash and cash equivalents		(2,104,503	)		7,018,133			(392,145	)		(12,807	)
Net increase (decrease) in cash and cash equivalents		38,574,095			41,196,646			(41,265,162	)		(1,347,654	)
Cash and cash equivalents at beginning of year		94,048,036			132,622,131			173,818,777			5,676,642
Cash and cash equivalents at end of year		132,622,131			173,818,777			132,553,615			4,328,988

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 2nd Road, Hsinchu Science Park, Hsinchu, 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 24, 2024.

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, 2023. There are 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
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
Amendments to IAS 1 “Presentation of Financial Statements” - Classification of Liabilities as Current or Non-current and Non-current Liabilities with Covenants	January 1, 2024
Amendments to IFRS 16 “Leases” - Lease Liability in a Sale and Leaseback	January 1, 2024
Amendments to IAS 7 “Statement of Cash Flows” and IFRS 7 “Financial Instruments: Disclosures” - Supplier Finance Arrangements	January 1, 2024
Amendments to IAS 21 “The Effects of Changes in Foreign Exchange Rates” - Lack of Exchangeability	January 1, 2025
IFRS 18 “Presentation and Disclosure in Financial Statements”	January 1, 2027

(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. Amendments to 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

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-12

b. Amendments to IAS 1 “Presentation of Financial Statements” (IAS 1) - Classification of Liabilities as Current or Non-current (“2020 amendments”) and Non-current Liabilities with Covenants (“2022 amendments”)

The 2020 amendments 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.

The 2022 amendments improved the information companies provide about long-term debt with covenants. The amendments specify that covenants to be complied within twelve months after the reporting period do not affect the classification of debt as current or non-current at the end of the reporting period.

c. Amendments to IFRS 16 “Leases” (IFRS 16) - Lease Liability in a Sale and Leaseback

The amendments add seller-lessee additional requirements for the sale and leaseback transactions in IFRS 16, thereby supporting the consistent application of the standard.

d. Amendments to IAS 7 “Statement of Cash Flows” and IFRS 7 “Financial Instruments: Disclosures” - Supplier Finance Arrangements

The amendments introduced additional information of supplier finance arrangements and added disclosure requirements for such arrangements.

e. Amendments to IAS 21 “The Effects of Changes in Foreign Exchange Rates” - Lack of Exchangeability

These amendments specify whether a currency is exchangeable into another currency and, when it is not, to determining the exchange rate to use and the disclosures to provide. The amendments apply for annual reporting periods beginning on or after January 1, 2025.

f. IFRS 18 “Presentation and Disclosure in Financial Statements”

The main changes in the new standard are as below:

(1) Improved comparability in the statement of profit or loss (income statement)

IFRS 18 requires entities to classify all income and expenses within their statement of profit or loss into one of five categories: operating; investing; financing; income taxes; and discontinued operations. The first three categories are new, to improve the structure of the income statement, and requires all entities to provide new defined subtotals, including operating profit. The improved structure and new subtotals will give investors a consistent starting point for analyzing entities’ performance and make it easier to compare entities.

(2) Enhanced transparency of management-defined performance measures

IFRS 18 requires entities to disclose explanations of those entity-specific measures that are related to the income statement, referred to as management-defined performance measures.

(3) Useful grouping of information in the financial statements

IFRS 18 sets out enhanced guidance on how to organize information and whether to provide it in the primary financial statements or in the notes. The changes are expected to provide more detailed and useful information. IFRS 18 also requires entities to provide more transparency about operating expenses, helping investors to find and understand the information they need.

IFRS 18 replaces IAS 1 Presentation of Financial Statements. IFRS 18 is effective for annual reporting periods beginning on or after January 1, 2027.

The Company is currently evaluating the potential impact of the aforementioned standards and interpretations listed (e) and (f) 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.

4. SUMMARY OF MATERIAL 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.

F-13

(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.

F-14

b. The consolidated entities as of December  31, 2022 and 2023 were as follows:

			Percentage of ownership (%) As of December 31,
Investor	Subsidiary	Business nature	2022		2023
UMC	UMC GROUP (USA)	IC Sales		100.00		100.00
UMC	UNITED MICROELECTRONICS (EUROPE) B.V. (UME BV)	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. (UMC KOREA)	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. (USJC)	Sales and manufacturing of integrated circuits		100.00		100.00
UMC and FORTUNE	WAVETEK MICROELECTRONICS CORPORATION (WAVETEK)	Sales and manufacturing of integrated circuits		80.14		80.00
TLC	SOARING CAPITAL CORP.	Investment holding		100.00		100.00
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		99.01
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
WAVETEK	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		—		100.00
WAVETEK	WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA)	Investment holding		100.00		—
WAVETEK-SAMOA	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		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		71.86		100.00

F-15

(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 “Financial Instruments” (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.

F-16

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.

F-17

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.

F-18

(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 NTD 30.62 on December 29, 2023 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.

F-19

(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.

F-20

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.

F-21

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.

F-22

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.

F-23

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) 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.

(12) 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.

F-24

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.

F-25

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.

(13) Property, Plant and Equipment

Property, plant and equipment are stated at cost, net of accumulated depreciation and accumulated impairment losses, if any. The cost of an item of property, plant and equipment comprises the acquisition cost, the costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management, and the initial estimate of costs for dismantling, removing the item and restoring the site on which it is located. 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 depreciation of the assets is calculated mainly over the following estimated useful lives: buildings - 20 to 56 years; machinery and equipment - 6 years; transportation equipment - 6 years; furniture and fixtures - 6 years; leasehold improvement - the shorter of lease terms or useful lives.

F-26

(14) 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.

F-27

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.

(15) 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.

F-28

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 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.

(16) 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.

F-29

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.

F-30

(17) Bonds

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.

(18) 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.

F-31

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.

(19) 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.

(20) Provision

Provisions are recognized when the Company has a present obligation (legal or constructive) as a result of a past event, it is probable that an outflow of resources embodying economic benefits will be required to settle the obligation and a reliable estimate can be made of the amount of the obligation. Where the Company expects some or all of a provision to be reimbursed, the reimbursement is recognized as a separate asset when, and only when it is virtually certain that reimbursement will be received. If the effect of the time value of money is material, provisions are discounted using a current pre-tax rate that reflects current market assessments of the time value of money and the risks specific to the liability. Where discounting is used, the increase in the provision due to the passage of time is recognized as a finance cost.

Decommissioning Liabilities

The amount of the decommissioning liability, arising from dismantling, removing the items of property, plant and equipment and restoring the site on which they are located, are provided at the present value of expected costs to settle the obligation using estimated cash flows, while the decommissioning costs are recognized as part of the cost of the particular items. The discount rate shall be a pre-tax rate that reflects current market assessments of the time value of money and the risks specific to the decommissioning liability. The periodic unwinding of the discount shall be recognized in profit or loss as a finance cost as it occurs. The estimated future costs of decommissioning are reviewed at the end of each reporting period and adjusted as appropriate. Changes in the estimated future costs or in the discount rate applied are added to or deducted from the cost of the items of property, plant and equipment.

Onerous contracts

An onerous contract is a contract in which the unavoidable costs of meeting the obligations under the contract exceed the economic benefits expected to be received under it. The present obligation under the onerous contract shall be recognized and measured as a provision. The unavoidable costs under a contract reflect the least net cost of exiting from the contract, which is the lower of the cost of fulfilling it and any compensation or penalties arising from failure to fulfill it. The aforementioned cost of fulfilling a contract comprises the costs that relate directly to the contract, which includes the incremental costs of fulfilling that contract and the allocation of other costs that relate directly to fulfilling contracts.

F-32

(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.

F-33

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.

F-34

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 profit or loss for the period.

F-35

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 that, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss and does not give rise to equal taxable and deductible temporary differences;

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 that, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss and does not give rise to equal taxable and deductible temporary differences;

F-36

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.

According to the temporary exception in the International Tax Reform – Pillar Two Model Rules (Amendments to IAS 12 “Income Taxes”), deferred tax assets and liabilities related to Pillar Two income tax will not be recognized nor disclosed.

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.

F-37

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 number of shares outstanding 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.

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. Actual results could differ from those estimates, and as such, differences may be material to the consolidated financial statements.

F-38

(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(6). 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.

6. CONTENTS OF SIGNIFICANT ACCOUNTS

(1) Cash and Cash Equivalents

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Cash on hand and petty cash	$	6,023	$	6,200
Checking and savings accounts		42,422,443		50,322,942
Time deposits		125,467,386		80,276,114
Repurchase agreements collateralized by government bonds and corporate notes		5,922,925		1,948,359
Total	$	173,818,777	$	132,553,615

F-39

(2) Financial Assets at Fair Value through Profit or Loss

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets mandatorily measured at fair value through profit or loss
Common stocks	$	10,275,563	$	9,170,230
Preferred stocks		2,939,939		2,862,119
Funds		5,044,702		4,472,097
Convertible bonds		230,365		480,715
Others		—		153,300
Total	$	18,490,569	$	17,138,461
Current	$	705,918	$	443,601
Non-current		17,784,651		16,694,860
Total	$	18,490,569	$	17,138,461

(3) Financial Assets at Fair Value through Other Comprehensive Income

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Equity instruments
Common stocks	$	15,007,053	$	17,508,897
Preferred stocks		182,547		175,063
Total	$	15,189,600	$	17,683,960
Current	$	3,213,057	$	5,753,379
Non-current		11,976,543		11,930,581
Total	$	15,189,600	$	17,683,960

F-40

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	2022		2023
		NT$		NT$
		(In Thousands)		(In Thousands)
Common stock	SILICON INTEGRATED SYSTEMS CORP.	$	2,316,197	$	—
Common stock	UNIMICRON HOLDING LIMITED		2,847,385		2,514,120
Common stock	ITE TECH. INC.		1,023,266		2,100,977
Common stock	CHIPBOND TECHNOLOGY CORPORATION		3,051,603		3,843,744
Common stock	NOVATEK MICROELECTRONICS CORP. (NOVATEK)		5,188,267		8,501,851
Common stock	SHIN-ETSU HANDOTAI TAIWAN CO., LTD.		580,335		548,205
Preferred stock	MTIC HOLDINGS PTE. LTD.		182,547		175,063

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.

b. Dividend income recognized in profit or loss from equity instruments designated as fair value through other comprehensive income were listed below:

	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Held at end of period	$	1,431,931	$	1,052,336
Derecognized during the period		—		142,535
Total	$	1,431,931	$	1,194,871

Please refer to Note 6(7) for derecognition of the equity instrument investment in SILICON INTEGRATED SYSTEMS CORP. (SIS) during the period.

c. The Company reclassified its equity instrument investment in SIS as investments accounted for under the equity method. Details on derecognition of such investments are as follow:

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Fair value on the date of disposal	$	—	$	—	$	3,035,999
Cumulative gains (losses) reclassified to retained earnings due to derecognition	$	—	$	—	$	(1,628,388	)

F-41

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) Financial assets measured at amortized cost

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets measured at amortized cost
Time deposits with original maturities over three months	$	849,308	$	6,353,768
Bonds		20,000		—
Total	$	869,308	$	6,353,768
Current	$	861,817	$	6,131,077
Non-current		7,491		222,691
Total	$	869,308	$	6,353,768

(5)  Accounts Receivable, Net
	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Accounts receivable	$	36,653,611		$	29,316,612
Less: loss allowance		(209,101	)		(79,062	)
Net	$	36,444,510		$	29,237,550

F-42

Aging analysis of accounts receivable:
	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Neither past due	$	30,545,437	$	25,707,008
Past due:
≤ 30 days		5,303,765		3,008,126
31 to 60 days		130,408		78,668
61 to 90 days		3,247		5,599
91 to 120 days		7,886		—
≥ 121 days		662,868		517,211
Subtotal		6,108,174		3,609,604
Total	$	36,653,611	$	29,316,612

Movement of loss allowance for accounts receivable:
	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Beginning balance	$	194,491	$	209,101
Net recognition (reversal) for the period		14,610		(130,039	)
Ending balance	$	209,101	$	79,062

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, 2021, 2022 and 2023, 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.

F-43

(6) Inventories, Net

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Raw materials	$	6,335,428	$	10,995,569
Supplies and spare parts		7,161,216		6,443,172
Work in process		14,897,926		15,560,517
Finished goods		2,675,390		2,713,300
Total	$	31,069,960	$	35,712,558

a. For the years ended December 31, 2021, 2022 and 2023, the Company recognized NT$135,856 million, NT$145,979 million and NT$136,902 million, respectively, in operating costs, of which NT$426 million in 2021 was related to reversal of write-down of inventories, and NT$98 million and NT$1,148 million in 2022 and 2023, respectively, were related to write-down of inventories.

b. None of the aforementioned inventories were pledged.

F-44

(7) Investments Accounted for Under the Equity Method

a. Details of investments accounted for under the equity method are as follows:

	As of December 31,
	2022				2023
Investee companies	Amount		Percentage of ownership or voting rights		Amount		Percentage of ownership or voting rights
	NT$				NT$
	(In Thousands)				(In Thousands)
Listed companies
SILICON INTEGRATED SYSTEMS CORP. (SIS) (Note A)	$	—		—	$	2,373,060		19.02
FARADAY TECHNOLOGY CORP. (FARADAY) (Note B)		1,862,245		13.78		1,990,073		13.78
UNIMICRON TECHNOLOGY CORP. (UNIMICRON) (Note C)		13,285,169		13.27		13,644,560		13.05
Unlisted companies
MTIC HOLDINGS PTE. LTD. (Note D)		—		45.44		—		45.44
UNITECH CAPITAL INC.		426,070		42.00		625,667		42.00
TRIKNIGHT CAPITAL CORPORATION (TRIKNIGHT) (Note E)		2,117,678		40.00		2,109,906		40.00
HSUN CHIEH CAPITAL CORP.		210,690		40.00		235,098		40.00
PURIUMFIL INC.		14,622		40.00		11,474		40.00
HSUN CHIEH INVESTMENT CO., LTD. (HSUN CHIEH) (Note F)		2,980,984		36.49		4,126,878		36.49
YANN YUAN INVESTMENT CO., LTD. (YANN YUAN)		5,455,743		26.78		7,516,327		26.78
UNITED LED CORPORATION HONG KONG LIMITED		97,156		25.14		93,793		25.14
VSENSE CO., LTD. (Note D)		—		23.98		—		23.98
TRANSLINK CAPITAL PARTNERS I, L.P. (Note G)		54,556		10.38		58,964		10.38
Total	$	26,504,913			$	32,785,800

Note A: In August 2023, the board chairman of SIS changed and became the same person as the board chairman of UMC. After considering the comprehensive conditions, including ownership interest held and representation on Board of Directors of SIS, etc., the Company determines that it has significant influence over SIS and accounts for its investment in SIS as an associate. SIS was previously measured at fair value through other comprehensive income and reclassified as investments accounted for under the equity method. UMC’s share of the net fair value of SIS’s identifiable assets and liabilities was in excess of the fair value of the previously held investment in SIS at the acquisition date, and the difference was recognized as bargain purchase gain. Cumulative fair value change that was previously recognized in other comprehensive loss up to reclassification date was reclassified to retained earnings in the current period.

Note B: Beginning from June 2015, the Company accounts for its investment in FARADAY as an associate given the fact that UMC obtained the ability to exercise significant influence over FARADAY through representation on its Board of Directors.

Note C: Beginning from June 2020, the Company accounts for its investment in UNIMICRON as an associate given the fact that UMC obtained the ability to exercise significant influence over UNIMICRON through representation on its Board of Directors. On January 6, 2023, UNIMICRON issued new shares to merge with SUBTRON TECHNOLOGY CO., LTD. (SUBTRON) through share conversion. The share conversion ratio was 1 common share of SUBTRON to exchange 0.219 common shares of UNIMICRON. The 23 million shares of SUBTRON held by the Company were exchanged to 5 million common shares newly issued by UNIMICRON.

F-45

Note D: 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 E: TRIKNIGHT executed a capital reduction and refunded NT$400 million and NT$560 million based on UMC’s stockholding percentage in June and December 2023, respectively. UMC’s stockholding percentage remains unchanged.

Note F: HSUN CHIEH executed a capital reduction and refunded NT$343 million based on UMC’s stockholding percentage in April 2023. UMC’s stockholding percentage remains unchanged.

Note G: 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$15,147 million and NT$18,008 million, as of December 31, 2022 and 2023, respectively. The fair value of these investments were NT$28,416 million and NT$53,726 million as of December 31, 2022 and 2023, 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 has significant influence over the aforementioned associates.

None of the aforementioned associates were pledged.

F-46

b. Financial information of associates:

There is no individually significant associate for the Company. 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, 2021, 2022 and 2023 were NT$(30) million, NT$103 million and NT$(3) 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,
	2021		2022			2023
	NT$		NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)
Profit from continuing operations	$	5,193,495	$	1,626,103		$	4,307,614
Other comprehensive income (loss)		2,965,202		(1,706,960	)		1,540,436
Total comprehensive income (loss)	$	8,158,697	$	(80,857	)	$	5,848,050

F-47

(8) Property, Plant and Equipment

a. 2022

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, 2022	$	1,491,343		$	36,827,480		$	897,806,699		$	55,959	$	7,305,174		$	61,282		$	22,856,033		$	966,403,970
Additions		—			325,943			—			—		—			—			72,270,938			72,596,881
Disposals		—			(69,897	)		(6,391,003	)		—		(27,782	)		(2,414	)		(69,640	)		(6,560,736	)
Transfers and reclassifications		—			219,666			46,548,734			8,154		730,317			421			(39,772,778	)		7,734,514
Exchange effect		(21,127	)		294,577			15,855,258			810		54,284			3,786			79,390			16,266,978
As of December 31, 2022	$	1,470,216		$	37,597,769		$	953,819,688		$	64,923	$	8,061,993		$	63,075		$	55,363,943		$	1,056,441,607
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, 2022	$	—		$	21,184,969		$	810,904,881		$	47,108	$	6,222,383		$	55,125		$	—		$	838,414,466
Depreciation		—			1,443,545			38,565,229			3,946		456,017			2,816			—			40,471,553
Disposals		—			(69,489	)		(6,331,532	)		—		(27,421	)		(2,404	)		—			(6,430,846	)
Transfers and reclassifications		—			161			(4,913	)		—		(176	)		—			—			(4,928	)
Exchange effect		—			172,320			14,604,120			543		46,714			3,846			—			14,827,543
As of December 31, 2022	$	—		$	22,731,506		$	857,737,785		$	51,597	$	6,697,517		$	59,383		$	—		$	887,277,788
Net carrying amount:
As of December 31, 2022	$	1,470,216		$	14,866,263		$	96,081,903		$	13,326	$	1,364,476		$	3,692		$	55,363,943		$	169,163,819

F-48

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, 2022	$	549,010		$	2,422,389		$	—	$	1,312,703		$	4,284,102
Disposals		—			—			—		(660	)		(660	)
Transfers and reclassifications		—			(1,226	)		6,345		15,562			20,681
Exchange effect		(3,223	)		22,084			—		6,686			25,547
As of December 31, 2022	$	545,787		$	2,443,247		$	6,345	$	1,334,291		$	4,329,670
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, 2022	$	—		$	1,095,113		$	—	$	1,236,790		$	2,331,903
Depreciation		—			94,644			—		60,229			154,873
Disposals		—			—			—		(660	)		(660	)
Transfers and reclassifications		—			(161	)		6,345		211			6,395
Exchange effect		—			13,216			—		5,696			18,912
As of December 31, 2022	$	—		$	1,202,812		$	6,345	$	1,302,266		$	2,511,423
Net carrying amount:
As of December 31, 2022	$	545,787		$	1,240,435		$	—	$	32,025		$	1,818,247

F-49

b. 2023

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, 2023	$	1,470,216		$	37,597,769		$	953,819,688		$	64,923		$	8,061,993		$	63,075		$	55,363,943		$	1,056,441,607
Additions		—			223,177			—			—			—			—			82,213,765			82,436,942
Disposals		—			(12,160	)		(6,475,636	)		—			(112,396	)		—			(33,581	)		(6,633,773	)
Transfers and reclassifications		—			902,122			77,170,979			7,104			953,582			3,379			(54,194,544	)		24,842,622
Exchange effect		(39,878	)		(341,045	)		(3,016,210	)		(315	)		(29,711	)		(631	)		(990,932	)		(4,418,722	)
As of December 31, 2023	$	1,430,338		$	38,369,863		$	1,021,498,821		$	71,712		$	8,873,468		$	65,823		$	82,358,651		$	1,152,668,676
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, 2023	$	—		$	22,731,506		$	857,737,785		$	51,597		$	6,697,517		$	59,383		$	—		$	887,277,788
Depreciation		—			1,416,727			35,031,869			4,924			490,468			4,149			—			36,948,137
Disposals		—			(12,160	)		(6,468,067	)		—			(112,330	)		—			—			(6,592,557	)
Exchange effect		—			(107,933	)		(2,212,913	)		(264	)		(19,642	)		(494	)		—			(2,341,246	)
As of December 31, 2023	$	—		$	24,028,140		$	884,088,674		$	56,257		$	7,056,013		$	63,038		$	—		$	915,292,122
Net carrying amount:
As of December 31, 2023	$	1,430,338		$	14,341,723		$	137,410,147		$	15,455		$	1,817,455		$	2,785		$	82,358,651		$	237,376,554

F-50

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, 2023	$	545,787		$	2,443,247		$	6,345	$	1,334,291		$	4,329,670
Transfers and reclassifications		—			—			—		54,469			54,469
Exchange effect		(6,084	)		(2,330	)		—		(3,020	)		(11,434	)
As of December 31, 2023	$	539,703		$	2,440,917		$	6,345	$	1,385,740		$	4,372,705

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, 2023	$	—	$	1,202,812		$	6,345	$	1,302,266		$	2,511,423
Depreciation		—		94,944			—		23,395			118,339
Exchange effect		—		(688	)		—		(3,063	)		(3,751	)
As of December 31, 2023	$	—	$	1,297,068		$	6,345	$	1,322,598		$	2,626,011
Net carrying amount:
As of December 31, 2023	$	539,703	$	1,143,849		$	—	$	63,142		$	1,746,694

c. Details of interest expense capitalized were as follows:

	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Interest expense capitalized	$	1,661	$	9,355
Interest rates applied		1.44% - 1.61%		1.48% - 1.65%

d. 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 31 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-51

a. The Company as a lessee

(a) Right-of-use Assets

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Land (including land use right)	$	5,714,166	$	5,318,986
Buildings		124,420		156,483
Machinery and equipment		1,748,244		1,506,824
Transportation equipment		21,485		16,356
Other equipment		3,676		1,706
Net	$	7,611,991	$	7,000,355
	For the years ended December 31,
	2022		2023
	NT$		NT$
Depreciation	(In Thousands)		(In Thousands)
Land (including land use right)	$	359,007	$	377,593
Buildings		119,641		93,610
Machinery and equipment		206,445		203,606
Transportation equipment		12,287		13,267
Other equipment		4,568		3,004
Total	$	701,948	$	691,080

i. For the years ended December 31, 2022 and 2023, the Company’s addition to right-of-use assets amounted to NT$1,130 million and NT$206 million, respectively.

ii. Please refer to Note 8 for right-of-use assets pledged as collateral.

F-52

(b) Lease Liabilities

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Current	$	537,314	$	514,324
Non-current		5,199,781		4,878,863
Total	$	5,737,095	$	5,393,187

Please refer to Note 6(24) 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

2022

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, 2022	$	15,012	$	4,845,037		$	4,491,164		$	3,348,071		$	12,699,284
Additions		—		2,713,534			—			480,880			3,194,414
Write-off		—		(1,857,289	)		(1,344,682	)		(869,940	)		(4,071,911	)
Reclassifications		—		(10,721	)		—			—			(10,721	)
Exchange effect		—		(20,774	)		275,950			(5,027	)		250,149
As of December 31, 2022	$	15,012	$	5,669,787		$	3,422,432		$	2,953,984		$	12,061,215

F-53

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, 2022	$	7,398	$	2,913,824		$	3,324,667		$	2,808,462		$	9,054,351
Amortization		—		1,656,765			475,870			556,965			2,689,600
Write-off		—		(1,857,289	)		(1,344,682	)		(869,940	)		(4,071,911	)
Exchange effect		—		(23,903	)		141,658			(3,780	)		113,975
As of December 31, 2022	$	7,398	$	2,689,397		$	2,597,513		$	2,491,707		$	7,786,015
Net carrying amount:
As of December 31, 2022	$	7,614	$	2,980,390		$	824,919		$	462,277		$	4,275,200

2023

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, 2023	$	15,012	$	5,669,787		$	3,422,432		$	2,953,984		$	12,061,215
Additions		—		1,399,699			346,896			999,510			2,746,105
Write-off		—		(1,498,642	)		(1,826,383	)		(632,860	)		(3,957,885	)
Reclassifications		—		(5,855	)		—			—			(5,855	)
Exchange effect		—		(98,912	)		(169,404	)		(9,993	)		(278,309	)
As of December 31, 2023	$	15,012	$	5,466,077		$	1,773,541		$	3,310,641		$	10,565,271

F-54

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, 2023	$	7,398	$	2,689,397		$	2,597,513		$	2,491,707		$	7,786,015
Amortization		—		1,741,898			277,768			535,944			2,555,610
Write-off		—		(1,498,642	)		(1,826,383	)		(632,860	)		(3,957,885	)
Exchange effect		—		(41,822	)		(139,933	)		(9,269	)		(191,024	)
As of December 31, 2023	$	7,398	$	2,890,831		$	908,965		$	2,385,522		$	6,192,716
Net carrying amount:
As of December 31, 2023	$	7,614	$	2,575,246		$	864,576		$	925,119		$	4,372,555

The amortization amounts of intangible assets were as follows:

	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Operating costs	$	1,329,850	$	1,144,960
Operating expenses	$	1,359,750	$	1,410,650

(11) Short-Term Loans

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Unsecured bank loans	$	—	$	13,530,000
	As of December 31,
	2022		2023
Interest rates applied		—		1.69% - 2.65%

(12) Financial Liabilities at Fair Value through Profit or Loss, Current

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Embedded derivatives in exchangeable bonds	$	438,397		$	1,019,362

F-55

(13) Bonds Payable

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured domestic bonds payable	$	23,100,000		$	33,100,000
Unsecured exchangeable bonds payable		5,757,373			5,757,373
Less: Discounts on bonds payable		(672,686	)		(498,021	)
Total		28,184,687			38,359,352
Less: Current or exchangeable portion due within one year		(5,101,591	)		(13,779,701	)
Net	$	23,083,096		$	24,579,651

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
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 was paid annually and the principal was fully repaid in March 2022.
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 was paid annually and the principal was fully repaid in October 2022.
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.
Five-year (Green bond)	In mid-September 2023	NT$10,000 million		1.62%	Interest will be paid annually and the principal will be repayable in September 2028 upon maturity.

F-56

b. 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:

(i) 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 on 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. 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.

F-57

(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 NOVATEK 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$533.8 per NOVATEK common share on December 31, 2023.

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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.

For the years ended December 31, 2022 and 2023, UMC has repurchased and cancelled the outstanding principal amount of exchangeable bonds totaling US$187.1 million and nil with derecognition of the related derivative financial liabilities, respectively. The difference between the repurchased amount and the carrying amount recognized in non-operating other gains and losses was immaterial.

(14) Long-Term Loans

a. Details of long-term loans as of December 31, 2022 and 2023 were as follows:

	As of December 31,
Lenders	2022		2023		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Long-Term Loan from Mega International Commercial Bank (1)	$	9,732	$	4,866	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)		18,000		13,765	Repayable quarterly from February 23, 2022 to February 22, 2027 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Mega International Commercial Bank (3)		60,500		46,265	Repayable quarterly from December 22, 2022 to February 23, 2027 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (1)		35,676		23,784	Repayable quarterly from October 19, 2015 to October 19, 2025 with monthly interest payments. Interest-only payment for the first year.

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	As of December 31,
Lenders	2022		2023		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Long-Term Loan from Taiwan Cooperative Bank (2)		4,375		—	Repayable monthly from May 31, 2019 to May 31, 2023 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (3)		32,000		20,000	Repayable monthly from August 13, 2020 to August 13, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (4)		16,552		10,345	Repayable monthly from October 29, 2020 to August 29, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (5)		84,166		58,916	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 (6)		—		34,400	Repayable quarterly from December 28, 2023 to December 28, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Syndicated Loans from China Development Bank and 6 others (1)		1,915,577		—	Repayable semi-annually from October 20, 2016 to October 19, 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 (2)		12,415,200		11,766,832	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		35,668	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		21,000	Settlement due on December 25, 2026 with monthly interest payments.
Secured Long-Term Loan from Shanghai Commercial Bank (1)		22,200		16,650	Repayable monthly from January 19, 2022 to December 15, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Shanghai Commercial Bank (2)		—		4,980	Repayable quarterly from March 23, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Shanghai Commercial Bank (3)		—		45,000	Repayable quarterly from June 6, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from CTBC Bank		—		131,750	Repayable semi-annually from September 25, 2023 to September 25, 2028 with monthly interest payments. Interest-only payment for the first and the second year.
Unsecured Long-Term Loan from Bank of China		1,797,364		1,515,790	Repayable semi-annually from June 24, 2023 to June 24, 2026 with quarterly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan		2,000,000		1,333,333	Repayable quarterly from March 24, 2023 to December 24, 2025 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (1) (Note A)		300,000		—	Settlement due on February 25, 2026 with monthly interest payments.

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	As of December 31,
Lenders	2022			2023			Redemption
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured Revolving Loan from First Commercial Bank (2) (Note A)		300,000			—		Settlement due on March 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (3) (Note A)		200,000			—		Settlement due on June 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (4) (Note B)		—			800,000		Settlement due on July 13, 2028 with monthly interest payments.
Unsecured Revolving Loan from Yuanta Commercial Bank (Note C)		—			3,000,000		Repayable annually from March 2, 2023 to March 2, 2026 with monthly interest payments.
Unsecured Revolving Loan from CTBC Bank (Note D)		—			4,000,000		Settlement due on July 20, 2025 with monthly interest payments.
Subtotal		19,279,342			22,883,344
Less: Current portion		(2,485,053	)		(2,227,096	)
Total	$	16,794,289		$	20,656,248
	As of December 31,
	2022			2023
Interest rates applied		1.48% - 5.62%			1.67% - 6.56%

Note A: First Commercial Bank approved the 1-year credit loan on April 14, 2022, which offered UMC a revolving line of credit of NT$2 billion starting from the approval date to April 13, 2023. As of December 31, 2022, the unused line of credit was NT$1.2 billion.

Note B: First Commercial Bank approved the 1-year credit loan on April 25, 2023, which offered UMC a revolving line of credit of NT$2 billion starting from the approval date to April 24, 2024. As of December 31, 2023, the unused line of credit was NT$1.2 billion.

Note C: 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, 2022 and 2023, the unused line of credit were NT$4 billion and nil, respectively.

Note D: UMC entered into a 5-year loan agreement with CTBC Bank, effective from December 24, 2021. The agreement offered UMC a revolving line of credit of NT$4 billion. The expiration date of the agreement is July 20, 2025. As of December 31, 2022 and 2023, the unused line of credit were NT$4 billion and nil, respectively.

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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 amount of endorsement for the years ended December 31, 2022 and 2023 were NT$7,547 million and NT$2,934 million, respectively. As of December 31, 2022 and 2023, the actual amount provided were NT$2,407 million and NT$1,686 million, respectively.

d. In 2017, UMC resolved to provide endorsement for USCXM’s syndicated loan from banks including China Development Bank. The maximum amount of endorsement for the years ended December 31, 2022 and 2023 were NT$17,876 million and NT$10,351 million, respectively. As of December 31, 2022 and 2023, the actual amount provided were NT$7,878 million and NT$9,946 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$1,636 million, NT$1,880 million and NT$1,655 million were contributed by the Company for the years ended December 31, 2021, 2022 and 2023, respectively.

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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, 2021, 2022 and 2023, total pension expenses of NT$23 million, NT$34 million and NT$45 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,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Defined benefit obligation at beginning of year	$	(5,458,333	)	$	(5,106,623	)
Items recognized as profit or loss:
Service cost		(9,911	)		(9,893	)
Interest cost		(33,842	)		(63,322	)
Subtotal		(43,753	)		(73,215	)
Remeasurements recognized in other comprehensive income (loss):
Arising from changes in financial assumptions		227,790			166,401
Experience adjustments		(56,959	)		226,634
Subtotal		170,831			393,035
Benefits paid		224,632			121,305
Defined benefit obligation at end of year	$	(5,106,623	)	$	(4,665,498	)

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ii. Movements in fair value of plan assets during the year:

	For the years ended December 31,
	2022			2023
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance of fair value of plan assets	$	1,581,012		$	2,237,221
Items recognized as profit or loss:
Interest income on plan assets		9,802			27,742
Contribution by employer		745,066			307,556
Benefits paid		(224,632	)		(121,305	)
Remeasurements recognized in other comprehensive income (loss):
Return on plan assets, excluding amounts included in interest income		125,973			9,199
Fair value of plan assets at end of year	$	2,237,221		$	2,460,413

The actual returns on plan assets of the Company for the years ended December 31, 2022 and 2023 were NT$136 million and NT$37 million, respectively.

iii. The defined benefit plan recognized on the consolidated balance sheets were as follows:

	As of December 31,
	2022			2023
	NT$ (In Thousands)			NT$ (In Thousands)
Present value of the defined benefit obligation	$	(5,106,623	)	$	(4,665,498	)
Fair value of plan assets		2,237,221			2,460,413
Funded status		(2,869,402	)		(2,205,085	)
Net defined benefit liabilities, noncurrent recognized on the consolidated balance sheets	$	(2,869,402	)	$	(2,205,085	)

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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,
	2022			2023
Cash		20	%		21	%
Equity instruments		47	%		46	%
Debt instruments		22	%		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,
	2022			2023
Discount rate		1.24	%		1.20	%
Rate of future salary increase		4.25	%		3.50	%

vi. Expected future benefit payments are as follows:

Year	As of December 31, 2023
	NT$ (In Thousands)
2024	$	596,934
2025		529,837
2026		486,833
2027		465,919
2028		434,293
2029 and thereafter		2,511,716
Total	$	5,025,532

The Company expects to make pension fund contribution of NT$700 million in 2024. The weighted-average durations of the defined benefit obligation were 7 years and 6 years as of December 31, 2022 and 2023, respectively.

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vii. Sensitivity analysis:

	As of December 31, 2022
	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	$	172,801	$	(182,478	)	$	(151,050	)	$	145,000

	As of December 31, 2023
	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	$	137,615	$	(144,683	)	$	(117,784	)	$	113,478

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,
	2022			2023
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance	$	8,543,798		$	4,677,444
Arising during the period		174,352			591,086
Recorded in profit or loss:
Other operating income		(4,164,189	)		(2,663,843	)
Exchange effect		123,483			(57,665	)
Ending balance	$	4,677,444		$	2,547,022
Current (classified under other current liabilities)	$	2,681,842		$	717,457
Non-current (classified under other noncurrent liabilities)		1,995,602			1,829,565
Total	$	4,677,444		$	2,547,022

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.

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(17) Refund Liabilities (classified under other current liabilities)

	As of December 31,
	2022		2023
	NT$ (In Thousands)		NT$ (In Thousands)
Refund liabilities	$	1,139,227	$	3,033,576

(18)  Provisions

	As of December 31,
	2022		2023
	NT$ (In Thousands)		NT$ (In Thousands)
Onerous Contracts (classified under other current liabilities)	$	469,779	$	57,800
Decommissioning Liabilities (classified under other noncurrent liabilities)		366,863		602,433
Total	$	836,642	$	660,233

	Onerous Contracts			Decommissioning Liabilities
	NT$ (In Thousands)			NT$ (In Thousands)
Balance as of January 1, 2023	$	469,779		$	366,863
Arising during the period		40,154			191,360
Unused provision reversed		(450,968	)		—
Discount rate adjustment and unwinding of discount from the passage of time		—			47,880
Exchange effect		(1,165	)		(3,670	)
Balance as of December 31, 2023	$	57,800		$	602,433

When the Company expects that the unavoidable costs of fulfilling the contractual obligations exceed the expected economic benefits from the contracts, the present obligation under the onerous contract are recognized and measured as provisions.

Under certain applicable agreement, the Company is obligated to dismantling and removing the items of property, plant and equipment and restoring the site on which they are located. Accordingly, the Company recognized the liability pursuant to the present value of the estimated decommissioning and restoration cost.

(19) Equity

a. Capital stock:

i. UMC had 26,000 million common shares authorized to be issued as of December 31, 2022 and 2023, of which 12,505 million shares and 12,530 million shares were issued as of December 31, 2022 and 2023, respectively, each at a par value of NT$10.

F-67

ii. UMC had 135 million and 121 million ADSs, which were traded on the NYSE as of December 31, 2022 and 2023, respectively. The total number of common shares of UMC represented by all issued ADSs were 674 million shares and 607 million shares as of December 31, 2022 and 2023, respectively. One ADS represents five common shares.

iii. On December 5, 2022 and December 5, 2023, UMC issued restricted stocks for its employees in a total of 23 million shares and 27 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(20) for the information of restricted stocks.

iv. For the years ended December 31, 2022 and 2023, UMC has recalled and cancelled 2 million shares and 2 million shares, respectively of unvested 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.

b. Details of UMC’s stock (thousand shares) held by the Company’s associates are as follows:

	As of December 31,
	2022		2023
HSUN CHIEH		441,371		441,371
YANN YUAN		192,963		192,963
SUBTRON, the subsidiary of UNIMICRON (Note A)		—		47
SIS (Note B)		—		266,580
Total		634,334		900,961

Note A: Beginning from January 2023, SUBTRON becomes an associate of the Company.

Note B: Beginning from August 2023, SIS becomes an associate of the Company.

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.

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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 2022 was approved by the shareholders’ meeting held on May 31, 2023, while the appropriation of earnings for 2023 was proposed by the Board of Directors’ meeting on February 27, 2024. The details of appropriation were as follows:

	Appropriation of earnings (in thousand NT dollars)						Cash dividend per share (NT dollars)
	2022			2023			2022		2023
Legal reserve	$	8,905,139		$	6,255,736
Special reserve		(2,180,156	)		(2,734,057	)
Cash dividends		45,017,096			37,587,102		$	3.60	$	3.00

F-69

The aforementioned 2022 appropriation approved by shareholders’ meeting was consistent with the resolutions of the Board of Directors’ meeting held on February 22, 2023.

The cash dividend per share for 2022 was adjusted to NT$3.60046348 per share. The adjustment was due to the decrease of outstanding common shares from cancellation of the restricted stock in April 2023.

The appropriation of 2023 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(22) for information on the employees and directors’ compensation.

d. Non-controlling interests:

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Balance as of January 1	$	113,356		$	223,181		$	343,679
Impact of retroactive applications		—			(66,089	)		—
Adjusted balance as of January 1		113,356			157,092			343,679
Attributable to non-controlling interests:
Net income (loss)		(668,245	)		819,960			450,184
Other comprehensive income (loss)		(19	)		8			(14	)
Share-based payment transactions		—			1,490			5,817
Changes in subsidiaries’ ownership		(11,126	)		(1,339	)		456
Non-controlling interests		23,430			5,456			4,187
Derecognition of the non-controlling interests		765,785			(638,988	)		(463,450	)
Ending balance	$	223,181		$	343,679		$	340,859

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(20) Share-Based Payment

a. 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. UMC 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 declaration 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 UMC are gradually eligible to the vested restricted stocks at certain percentage and time frame. For those employees who fail to fulfill the vesting conditions, UMC 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.

On May 27, 2022, the shareholders approved a compensation plan in their meeting to issue restricted stocks to qualified employees of the Company without consideration. The maximum shares to be issued are 50 million common shares. UMC is authorized to issue restricted stocks in one tranche or in installments, under the custody of trust institution, within two years from the date of receiving the effective declaration from the competent authority.

F-71

The issuance plan was authorized for effective registration by the Securities and Futures Bureau of the FSC and accordingly, 23 million shares and 27 million shares of restricted stock for employees were issued without consideration on December 5, 2022 and December 5, 2023, 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 UMC are gradually eligible to the vested restricted stocks at certain percentage and time frame. For those employees who fail to fulfill the vesting conditions, UMC 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 issued in 2020 and 2022 were measured at fair value based on the closing quoted market price of the shares on the grant date, NT$21.8, NT$53.0, NT$44.4 and NT$48.9 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, 2021, 2022 and 2023, the compensation costs of NT$1,520 million, NT$1,352 million and NT$1,025 million, respectively, were recognized in expenses by the Company.

b. 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-72

The compensation cost for the cash-settled share-based payment was measured at fair value initially by using Black-Scholes Option Pricing Model and will be remeasured at the end of each reporting period until settlement. As of December 31, 2023, the assumptions used are as follows:

	Granted in September 2020		Granted in June 2021
Share price of measurement date (NT$/ per share)	$	52.60	$	52.60
Expected volatility		23.95%		23.21% - 28.72%
Expected life		0.67 years		0.44 - 1.44 years
Expected dividend yield		6.02%		6.02%
Risk-free interest rate		1.06%		1.06% - 1.08%

For the years ended December 31, 2021, 2022 and 2023, the compensation costs of NT$271 million, NT$210 million and NT$105 million, respectively, were recognized in expenses by the Company. The liabilities for stock appreciation right recognized which were classified under other payables and other noncurrent liabilities amounted to NT$340 million and NT$207 million as of December 31, 2022 and 2023, respectively. The intrinsic value for the liabilities of vested rights was nil.

(21) Operating Revenues

a. Disaggregation of revenue

i. By product

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Wafer	$	204,594,399	$	265,600,173	$	211,750,622
Others		8,416,619		13,105,091		10,782,378
Total	$	213,011,018	$	278,705,264	$	222,533,000

F-73

ii. By geography

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Taiwan	$	92,427,670		$	105,213,451		$	68,360,231
China (includes Hong Kong)		26,949,205			39,641,613			27,545,452
Japan		13,445,127			17,053,279			11,612,866
Korea		17,548,763			25,689,385			30,872,198
USA		46,914,605			67,352,671			59,103,051
Europe		15,708,303			23,711,284			24,932,099
Others		17,345			43,581			107,103
Total	$	213,011,018		$	278,705,264		$	222,533,000

Beginning from 2023, the geographic breakdown of the Company’s operating revenues is based on the location where the Company’s customers are headquartered, and the comparative information in respect of the preceding period is also presented on a consistent basis.

iii. By the timing of revenue recognition

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
At a point in time	$	211,074,982		$	276,175,120		$	220,283,306
Over time		1,936,036			2,530,144			2,249,694
Total	$	213,011,018		$	278,705,264		$	222,533,000

b. Contract balances

i. Contract assets, current

	As of January 1,			As of December 31,
	2022			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Sales of goods and services	$	677,326		$	766,691		$	1,132,477
Less: Loss allowance		(357,705	)		(393,373	)		(392,949	)
Net	$	319,621		$	373,318		$	739,528

F-74

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,
	2022		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Sales of goods and services	$	4,083,140	$	3,985,003	$	3,681,352
Current	$	3,441,754	$	3,546,815	$	3,250,712
Non-current		641,386		438,188		430,640
Total	$	4,083,140	$	3,985,003	$	3,681,352

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$3,112 million and NT$2,871 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, 2022 and 2023.

c. The Company’s transaction price allocated to unsatisfied performance obligations amounted to NT$223 million and NT$195 million as of December 31, 2022 and 2023, 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. 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, 2022 and 2023, the Company recognized costs to fulfill engineering service contracts eligible for capitalization as other current assets which amounted to NT$721 million and NT$877 million, respectively. Subsequently, the Company will expense from costs to fulfill a contract to operating costs when the related obligations are satisfied.

F-75

(22) Operating Costs and Expenses

The Company’s employee benefit, depreciation and amortization expenses are summarized as follows:

	For the years ended December 31,
	2021						2022						2023
	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	$	23,388,888	$	11,806,207	$	35,195,095	$	30,074,528	$	13,928,646	$	44,003,174	$	26,693,905	$	12,002,205	$	38,696,110
Labor and health insurance		1,183,315		458,179		1,641,494		1,368,803		471,788		1,840,591		1,502,553		557,543		2,060,096
Pension		1,259,044		399,879		1,658,923		1,489,076		424,752		1,913,828		1,240,577		460,079		1,700,656
Other employee benefit expenses		335,829		144,668		480,497		373,739		165,114		538,853		421,871		196,739		618,610
Depreciation		42,002,745		1,908,719		43,911,464		39,305,321		1,756,609		41,061,930		36,006,021		1,545,067		37,551,088
Amortization		834,384		2,060,558		2,894,942		1,470,912		1,370,422		2,841,334		1,277,920		1,448,561		2,726,481

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 recognized the employees and directors’ compensation in the profit or loss with corresponding other payables during the periods when earned for the years ended December 31, 2021, 2022 and 2023. 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-76

The distributions of employees and directors’ compensation for 2021 and 2022 were reported to the shareholders’ meeting on May 27, 2022 and May 31, 2023, respectively, while the distributions of employees and directors’ compensation for 2023 were approved through the Board of Directors’ meeting on February 27, 2024. The details of distribution were as follows:

	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Employees’ compensation – Cash	$	4,770,909	$	9,160,485	$	5,439,059
Directors’ compensation		25,264		45,000		45,000

The aforementioned employees and directors’ compensation for 2021 and 2022 reported during the shareholders’ meeting were consistent with the resolutions of the Board of Directors’ meeting held on February 24, 2022 and February 22, 2023, 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.

(23) Net Other Operating Income and Expenses

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Government grants	$	5,269,412		$	5,058,658		$	3,862,001
Rental income from property, plant and equipment		187,166			192,833			202,082
Gain on disposal of property, plant and equipment		143,735			482,983			268,293
Others		(373,482	)		(394,827	)		(330,050	)
Total	$	5,226,831		$	5,339,647		$	4,002,326

F-77

(24) Non-Operating Income and Expenses

a. Other gains and losses

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Gain (Loss) on valuation of financial assets and liabilities at fair value through profit or loss	$	2,892,470		$	(1,247,962	)	$	(40,553	)
Gain (Loss) on disposal of investments accounted for under the equity method		(16,388	)		50,553			163,395
Others		(2,009,952	)		62,869			100,254
Total	$	866,130		$	(1,134,540	)	$	223,096

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.

b. Finance costs

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Interest expenses
Bonds payable	$	437,055	$	486,079	$	444,424
Bank loans		1,285,708		1,100,840		833,548
Lease liabilities		145,187		166,928		179,367
Others		139		31,464		16,390
Financial expenses		94,841		81,018		96,645
Total	$	1,962,930	$	1,866,329	$	1,570,374

F-78

(25) Components of Other Comprehensive Income (Loss)

	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-79

	For the year ended December 31, 2022
	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	$	296,804		$	—	$	296,804		$	(59,361	)	$	237,443
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		(4,646,064	)		—		(4,646,064	)		(71,121	)		(4,717,185	)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		(1,694,965	)		—		(1,694,965	)		123,483			(1,571,482	)
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		9,292,308			—		9,292,308			883,238			10,175,546
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		91,442			—		91,442			(23,672	)		67,770
Total other comprehensive income (loss)	$	3,339,525		$	—	$	3,339,525		$	852,567		$	4,192,092

F-80

	For the year ended December 31, 2023
	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	$	402,234		$	—		$	402,234		$	(80,447	)	$	321,787
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		5,530,359			—			5,530,359			(243,057	)		5,287,302
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		1,610,116			—			1,610,116			(90,891	)		1,519,225
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(2,386,278	)		—			(2,386,278	)		386,660			(1,999,618	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		(73,005	)		(1,413	)		(74,418	)		3,768			(70,650	)
Total other comprehensive income (loss)	$	5,083,426		$	(1,413	)	$	5,082,013		$	(23,967	)	$	5,058,046

(26) Income Tax

a. The major components of income tax expense (benefit) for the years ended December 31, 2021, 2022 and 2023 were as follows:

i. Income tax expense (benefit) recorded in profit or loss

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Current income tax expense (benefit):
Current income tax charge	$	7,088,975		$	17,582,039		$	6,426,598
Adjustments in respect of current income tax of prior periods		(150,260	)		(585,941	)		(217,891	)
Deferred income tax expense (benefit):
Deferred income tax related to origination and reversal of temporary differences		407,280			2,276,015			2,239,309
Deferred income tax related to recognition and derecognition of tax losses and unused tax credits		723,270			60,178			—
Adjustment of prior year’s deferred income tax		(130,841	)		8,611			(120,230	)
Deferred income tax arising from write-down or reversal of write-down of deferred tax assets		(20,172	)		(14,007	)		(16,516	)
Income tax expense recorded in profit or loss	$	7,918,252		$	19,326,895		$	8,311,270

F-81

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,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Remeasurements of defined benefit pension plans	$	39,495		$	(59,361	)	$	(80,447	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		(360,061	)		(71,121	)		(243,057	)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		(96,510	)		123,483			(90,891	)
Income tax related to items that will not be reclassified subsequently to profit or loss	$	(417,076	)	$	(6,999	)	$	(414,395	)

F-82

(ii)  Items that may be reclassified subsequently to profit or loss:
	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Exchange differences on translation of foreign operations	$	23,175		$	883,238		$	386,660
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		6,763			(23,672	)		3,768
Income tax related to items that may be reclassified subsequently to profit or loss	$	29,938		$	859,566		$	390,428
iii.   Income tax charged directly to equity
	For the years ended December 31,
	2021			2022			2023
	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):
Adjustments of changes in net assets of associates and joint ventures accounted for using equity method		22			(2,720	)		(1,117	)
Income tax charged directly to equity	$	(181	)	$	(2,720	)	$	(1,117	)

F-83

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,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Income before tax	$	58,496,432		$	109,625,660		$	68,450,404
At UMC’s statutory income tax rate		11,699,286			21,925,132			13,690,081
Adjustments in respect of current income tax of prior periods		(150,260	)		(585,941	)		(217,891	)
Net changes in loss carry-forward and investment tax credits		(845,267	)		(465,152	)		(2,179,234	)
Adjustment of deferred tax assets/liabilities for write-downs/reversals and different jurisdictional tax rates		183,123			(281,319	)		211,639
Tax effect of non-taxable income and non-deductible expenses:
Tax exempt income		(3,258,695	)		(4,384,566	)		(1,428,035	)
Investment loss (gain)		(1,388,877	)		1,827,822			(755,800	)
Dividend income		(171,725	)		(423,027	)		(323,182	)
Others		6,463			(340,745	)		(145,520	)
Basic tax		—			—			43,506
Estimated income tax on unappropriated earnings		1,558,031			1,247,910			(1,160,324	)
Effect of different tax rates applicable to UMC and its subsidiaries		116,174			605,929			234,510
Taxes withheld in other jurisdictions		43,443			35,979			38,346
Others		126,556			164,873			303,174
Income tax expense recorded in profit or loss	$	7,918,252		$	19,326,895		$	8,311,270

F-84

c. Significant components of deferred income tax assets and liabilities were as follows:

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Deferred income tax assets
Depreciation	$	2,056,568		$	2,396,554
Pension		569,193			436,129
Refund liabilities		138,617			306,408
Allowance for inventory valuation losses		507,621			682,909
Investment loss		474,405			314,427
Unrealized profit on intercompany sales		906,793			689,124
Others		573,039			304,860
Total deferred income tax assets		5,226,236			5,130,411
Deferred income tax liabilities
Depreciation		(70,133	)		(2,085,916	)
Investment gain		(2,648,989	)		(2,888,534	)
Amortizable assets		(298,451	)		(283,405	)
Others		(544,863	)		(374,109	)
Total deferred income tax liabilities		(3,562,436	)		(5,631,964	)
Net deferred income tax assets (liabilities)	$	1,663,800		$	(501,553	)

d. Movement of deferred tax

	For the years ended December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Balance as of January 1	$	3,154,352		$	1,663,800
Amounts recognized in profit or loss during the period		(2,330,797	)		(2,102,563	)
Amounts recognized in other comprehensive income (loss)		852,567			(23,967	)
Amounts recognized in equity		(2,720	)		(1,117	)
Exchange adjustments		(9,602	)		(37,706	)
Balance as of December 31	$	1,663,800		$	(501,553	)

F-85

e. The Company is subject to taxation in Taiwan and other foreign jurisdictions. As of December 31, 2023, income tax returns of UMC and its subsidiaries in Taiwan have been examined by the tax authorities through 2021, while in other foreign jurisdictions, relevant tax authorities have completed the examination through 2012.

f. 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.

g. 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,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Expiry period
1-5 years	$	35,263,925	$	15,395,514
6-10 years		1,995,256		22,128,180
Total	$	37,259,181	$	37,523,694

h. As of December 31, 2022 and 2023, deductible temporary differences for which no deferred income tax assets have been recognized amounted to NT$3,001 million and NT$3,410 million, respectively.

i. As of December 31, 2022 and 2023, the taxable temporary differences of unrecognized deferred tax liabilities associated with investments in subsidiaries amounted to NT$21,658 million and NT$20,389 million, respectively.

j. USJC, UMC KOREA and UME BV, the subsidiaries of UMC, are operating in jurisdictions where the Pillar Two legislation has been enacted or substantively enacted. However, the Pillar Two legislation is not yet implemented in the aforementioned jurisdictions as of December 31, 2023; therefore, the Company is not exposed to the income tax arising from the legislation for the year ended December 31, 2023. The average effective tax rate calculated in accordance with IAS 12 in the jurisdictions where USJC, UMC KOREA and UME BV operate is 27.70%, 3.55% and 20.12%, respectively, which is applicable to the accounting profits of NT$3,408 million, NT$2 million and NT$10 million, respectively, for the year ended December 31, 2023. 

F-86

(27) Earnings Per Share

a. Earnings per share-basic

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	51,246,425	$	89,478,805	$	59,688,950
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)		12,005,126		12,095,312		12,137,954
Earnings per share-basic (NTD)	$	4.27	$	7.40	$	4.92

b. Earnings per share-diluted

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	51,246,425	$	89,478,805	$	59,688,950
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)		12,005,126		12,095,312		12,137,954
Effect of dilution
Restricted stocks for employees		159,478		156,098		114,974
Employees’ compensation		80,243		238,242		129,196
Weighted-average number of ordinary shares after dilution (thousand shares)		12,244,847		12,489,652		12,382,124
Earnings per share-diluted (NTD)	$	4.19	$	7.16	$	4.82

F-87

(28) Reconciliation of Liabilities Arising from Financing Activities

For the year ended December 31, 2021

						Non-cash changes
Items	As of January 1, 2021		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 B	)  )		40,536,658
Guarantee deposits (current portion included)		235,992		14,219,408			(85,631	)		—			14,369,769 (Note C	)
Lease liabilities		5,576,864		(699,680	)		(144,419	)		335,989			5,068,754
Other financial liabilities (Note D)		20,746,624		—			(163,387	)		382,972			20,966,209

For the year ended December 31, 2022

						Non-cash changes
Items	As of January 1, 2022		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2022
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	1,924,124	$	(1,965,684	)	$	41,560		$	—		$	—
Long-term loans (current portion included)		36,624,907		(18,816,259	)		1,470,694			—			19,279,342
Bonds payable (current portion included)		40,536,658		(13,305,050	)		—			953,079 (Note B	)		28,184,687
Guarantee deposits (current portion included)		14,369,769		14,984,941			1,402,291			—			30,757,001 (Note C	)
Lease liabilities		5,068,754		(712,854	)		153,406			1,227,789 (Note E	)		5,737,095
Other financial liabilities (Note D)		20,966,209		—			306,902			176,376			21,449,487

F-88

For the year ended December 31, 2023

						Non-cash changes
Items	As of January 1, 2023		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2023
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	—	$	13,530,000		$	—		$	—		$	13,530,000
Long-term loans (current portion included)		19,279,342		3,857,704			(253,702	)		—			22,883,344
Bonds payable (current portion included)		28,184,687		9,989,245			—			185,420 (Note B	)		38,359,352
Guarantee deposits (current portion included)		30,757,001		10,423,345			419,040			—			41,599,386 (Note C	)
Lease liabilities		5,737,095		(666,439	)		(24,106	)		346,637			5,393,187
Other financial liabilities (Note D)		21,449,487		(21,209,443	)		(330,783	)		90,739			—

Note A: Other non-cash changes mainly consisted of discount amortization measured by the effective interest method.

Note B: Please refer to Note 6(13) for the Company’s exchangeable bonds.

Note C: Guarantee deposits mainly consisted of deposits of capacity reservation.

Note D: Please refer to Note 9(6) for more details on other financial liabilities.

Note E: Mainly due to the increase in land lease.

F-89

7. SIGNIFICANT RELATED PARTY TRANSACTIONS

a. Significant intercompany transactions between consolidated entities were as follows:

For the year ended December 31, 2021

Entity	Counterparty	Transactions (Note A)
		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		—

F-90

For the year ended December 31, 2022

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	68,554,072		Net 60 days
UMC	UMC-USA	Accounts receivable		9,502,922		—
UMC	USCXM	Sales		1,143,280 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		16,774		—
UMC	UDS	Sales		656,472		Net 30 days
UMC	UDS	Accounts receivable		6,734		—
UMC	USJC	Sales		164,855		Net 60 days
UMC	USJC	Accounts receivable		151,430		—
USJC	UMC-USA	Sales		4,272,900		Net 60 days
USJC	UMC-USA	Accounts receivable		744,082		—
USCXM	UMC-USA	Sales		1,565,670		Net 60 days
USCXM	UMC-USA	Accounts receivable		310,431		—
USCXM	UMC	Sales		1,035,407		Net 30 days - Net 45 days
USCXM	UMC	Accounts receivable		173		—
USCXM	UDS	Sales		148,259		Month-end 30 days
USCXM	UDS	Accounts receivable		171		—
WAVETEK	UMC-USA	Sales		716,357		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		81,819		—
WAVETEK	UMC	Sales		124,178		Month-end 30 days
HJ	UMC-USA	Sales		551,913		Net 60 days
HJ	UMC-USA	Accounts receivable		147,265		—
HJ	UDS	Sales		311,972		Month-end 30 days
HJ	UDS	Accounts receivable		9,500		—

F-91

For the year ended December 31, 2023

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	61,923,652		Net 60 days
UMC	UMC-USA	Accounts receivable		5,827,800		—
UMC	USCXM	Sales		1,127,275 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		11,688		—
UMC	UDS	Sales		364,948		Net 30 days
UMC	UDS	Accounts receivable		10,800		—
USJC	UMC-USA	Sales		3,487,292		Net 60 days
USJC	UMC-USA	Accounts receivable		342,835		—
USCXM	UMC-USA	Sales		1,208,630		Net 60 days
USCXM	UMC-USA	Accounts receivable		17,816		—
USCXM	UMC	Sales		134,303		Net 30 days - Net 45 days
USCXM	UDS	Sales		286,087		Month-end 30 days
USCXM	UDS	Accounts receivable		362		—
WAVETEK	UMC-USA	Sales		505,806		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		53,916		—
HJ	UMC-USA	Sales		384,067		Net 60 days
HJ	UMC-USA	Accounts receivable		43,863		—
HJ	UDS	Sales		159,523		Month-end 30 days
HJ	UDS	Accounts receivable		2,696		—

Note A: The significant intercompany transactions listed above include downstream and upstream transactions.

F-92

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.

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
	UNIMICRON TECHNOLOGY CORP.	Associate
	SILICON INTEGRATED SYSTEMS CORP.	Associate (Note)
	PHOTRONICS DNP MASK CORPORATION	Other related party
	XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.	Directors and supervisors of subsidiaries
	FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP	Directors of subsidiaries

Note: Prior to August 2023, SIS held one board seat on UMC’s Board of Directors. Therefore, SIS was classified as other related party. Beginning from August 2023, the Company determines that it has significant influence over SIS and accounts for its investment in SIS as an associate. Please refer to Note 6(7) for the relevant information.

(ii) Operating revenues

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	2,778,544	$	5,744,098	$	3,018,171
Other related party		38,797		40,474		4,463
Total	$	2,817,341	$	5,784,572	$	3,022,634

(iii) Accounts receivable, net

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates
FARADAY TECHNOLOGY CORP. and its Subsidiaries
FARADAY TECHNOLOGY CORP.	$	441,963	$	302,828
ARTERY TECHNOLOGY CORPORATION, LTD.		56,864		40,886
Others		30,698		3,602
Other associates		—		648
Other related party		1,052		—
Total	$	530,577	$	347,964

F-93

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 30 - 60 days.

(iv) Refund liabilities (classified under other current liabilities)

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	1,545	$	636
Other related party		7		—
Total	$	1,552	$	636

(v) Significant asset transactions

Acquisition of financial assets at fair value through profit or loss, noncurrent

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

F-94

For the years ended December 31, 2022 and 2023: None.

Acquisition of subsidiaries’ ownership

For the years ended December 31, 2021 and 2022: None.

For the year ended December 31, 2023:

	Trading Capital Amount		Transaction underlying		Purchase price
	RMB¥				NT$
	(In Thousands)				(In Thousands)
XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.		3,741,862		Ownership of USCXM	$	17,945,970
FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP		674,762		Ownership of USCXM		3,263,473
Total		4,416,624			$	21,209,443

Please refer to Note 9(6) for the relevant information.

Acquisition of investments accounted for under the equity method

For the years ended December 31, 2021 and 2022: None.

For the year ended December 31, 2023:

	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		4,945	Stock of UNIMICRON	$	608,224

Please refer to Note 6(7) for the relevant information.

Acquisition of intangible assets

	Purchase price
	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
FARADAY TECHNOLOGY CORP.	$	181,254	$	266,053	$	323,551
(vi)  Others
Mask expenditure
	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Other related party	$	1,861,438	$	2,581,409	$	2,375,225
Other payables of mask expenditure
	As of December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Other related party	$	560,042	$	812,185	$	751,763

c. Key management personnel compensation

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Short-term employee benefits	$	562,117	$	2,047,118	$	1,462,964
Post-employment benefits		2,322		2,782		2,732
Share-based payment		1,035,401		719,786		500,391
Others		578		649		618
Total	$	1,600,418	$	2,770,335	$	1,966,705

F-95

8. ASSETS PLEDGED AS COLLATERAL

The following table lists assets of the Company pledged as collateral:

	As of December 31,
	2022		2023		Party to which asset(s) was pledged	Purpose of pledge
	NT$		NT$
	(In Thousands)		(In Thousands)
Refundable Deposits (Time deposit)	$	812,248	$	813,289	Customs	Customs duty guarantee
Refundable Deposits (Time deposit)		236,587		236,556	Science Park Bureau	Collateral for land lease
Refundable Deposits (Time deposit)		29,371		18,647	Science Park Bureau	Collateral for dormitory lease
Refundable Deposits (Time deposit)		64,950		64,950	National Property Administration, Ministry of Finance	Guarantee for the application of national non-public use land for development
Refundable Deposits (Time deposit)		8,118		8,118	Bureau of Land Administration, Tainan City Government	Guarantee for the application of national non-public use land for development
Refundable Deposits (Time deposit)		34,100		36,970	Liquefied Natural Gas Business Division, CPC Corporation, Taiwan	Energy resources guarantee
Refundable Deposits (Time deposit)		1,043,840		1,006,852	Bank of China and Agricultural Bank of China	Bank performance guarantee
Refundable Deposits (Time deposit)		459,750		459,900	CTBC Bank Singapore Branch	Collateral for letter of credit
Buildings		4,828,597		4,487,730	Taiwan Cooperative Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Machinery and equipment		14,066,044		6,627,761	Taiwan Cooperative Bank, Mega International Commercial Bank, KGI Bank, First Commercial Bank, Shanghai Commercial Bank, CTBC Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Transportation equipment		592		—	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Furniture and fixtures		46,823		—	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Right-of-use assets		278,230		266,650	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Total	$	21,909,250	$	14,027,423

F-96

9. SIGNIFICANT CONTINGENCIES AND UNRECOGNIZED CONTRACT COMMITMENTS

(1) As of December 31, 2023, amounts available under unused letters of credit were NT$33.2 billion.

(2) As of December 31, 2023, the Company entrusted financial institutions to open performance guarantee, mainly related to the litigations, electricity supply and customs tax guarantee, amounting to NT$2.2 billion.

F-97

(3) The Company entered into several patent license agreements and development contracts of intellectual property for a total contract amount of approximately NT$3.8 billion. As of December 31, 2023, the portion of royalties and development fees not yet recognized was NT$1.2 billion.

(4) The Company entered into several construction contracts for the expansion of its operations. As of December 31, 2023, these construction contracts amounted to approximately NT$70.6 billion and the portion of the contracts not yet recognized was approximately NT$38.4 billion.

(5) The Company entered into several wafer fabrication 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, the Company repurchases 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.

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, GE, to purchase the shares of USCXM from XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD. In addition, the Company’s subsidiary, HJ, 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¥4.9 billion. The transaction was completed all at once in July, 2023.

F-98

(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) and of MICRON MEMORY TAIWAN CO., LTD. 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 January 27, 2024, UMC completed the probation period successfully and the sentence has been terminated.

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 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 application for injunctive procedure. On March 28, 2024, the court approved UMC’s withdrawal of actions and the application for injunctive procedure.

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.

F-99

10. SIGNIFICANT SUBSEQUENT EVENTS

(1) On January 25, 2024, UMC and INTEL CORPORATION (INTEL) announced to collaborate on the development of a 12-nanometer semiconductor process platform to address high-growth markets such as mobile, communication infrastructure and networking. The long-term agreement brings together INTEL’s at-scale U.S. manufacturing capacity and UMC’s extensive foundry experience on mature nodes to enable an expanded process portfolio. It also offers global customers greater choice in their sourcing decisions with access to a more geographically diversified and resilient supply chain.

(2) On February 27, 2024, the Board of Directors of UMC approved to participate in the capital increase of the Company’s subsidiary, UMC CAPITAL CORP., and UMC has completed the investment in the amount of US$22 million in April 2024. 

(3) On February 27, 2024, the Board of Directors of the Company’s subsidiary, UMC CAPITAL CORP., approved an investment in 7V AI CAPITAL LLC, with amount not more than US$20 million.

(4) On March 22, 2024, the Board of Directors of UMC approved to participate in the capital increase of the Company’s associate, FARADAY TECHNOLOGY CORP., and UMC has subscribed the newly issued shares in the amount of NT$534 million in March 2024.

(5) On April 2, 2024, the Board of Directors of the Company’s subsidiary, HEJIAN TECHNOLOGY (SUZHOU) CO., LTD., approved to disposed of its 100% of ownership interest in the subsidiary, UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD., with disposal amount of RMB¥77 million. The counterparty is a Mainland China company set up by the Company’s associate, SILICON INTEGRATED SYSTEMS CORP., through its Cayman subsidiary, SIS INVESTMENT LIMITED.

(6) The recent 7.2 magnitude earthquake recorded off the coast of Hualien, Taiwan in the early hours of April 3, 2024 had no material impact on the Company’s operations. Automatic safety measures at the company’s fabs in Hsinchu and Fab 12A in Tainan were triggered and some wafers in the production line were affected. However, operations and wafer shipment were resuming as normal, and there is no material impact on the Company’s finances and business.

11. FINANCIAL RISK AND FAIR VALUE DISCLOSURES

(1) Categories of financial instruments

	As of December 31,
Financial Assets	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets at fair value through profit or loss	$	18,490,569	$	17,138,461
Financial assets at fair value through other comprehensive income		15,189,600		17,683,960
Financial assets measured at amortized cost
Cash and cash equivalents (cash on hand excluded)		173,812,754		132,547,415
Receivables		38,783,086		32,292,914
Refundable deposits		2,749,691		2,708,823
Other financial assets		869,308		6,353,768
Total	$	249,895,008	$	208,725,341

	As of December 31,
Financial Liabilities	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial liabilities at fair value through profit or loss	$	438,397	$	1,019,362
Financial liabilities measured at amortized cost
Short-term loans		—		13,530,000
Payables		58,893,871		52,393,399
Guarantee deposits (current portion included)		30,757,001		41,599,386
Bonds payable (current portion included)		28,184,687		38,359,352
Long-term loans (current portion included)		19,279,342		22,883,344
Lease liabilities		5,737,095		5,393,187
Other financial liabilities		21,449,487		—
Total	$	164,739,880	$	175,178,030

F-100

(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.

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, 2021, 2022 and 2023 decreases/increases by NT$1,104 million, NT$1,305 million and NT$620 million, respectively. When RMB strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2021, 2022 and 2023 increases/decreases by NT$375 million and decreases/increases by NT$572 million, NT$582 million, respectively. When JPY strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2021, 2022 and 2023 decreases/increases by NT$434 million, NT$538 million and NT$290 million, respectively.

F-101

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), (13) and (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, 2021, 2022 and 2023 to decrease/increase by NT$39 million, NT$19 million and NT$36 million, respectively.

Equity price risk

The Company’s listed and unlisted equity securities, investments in convertible bonds 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, the investments in convertible bonds which contain the right of conversion to equity instruments are classified as financial assets at fair value through profit or loss, and the 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. Please refer to Note 6(2), (3) and (12) for the relevant information.

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, 2021, 2022 and 2023 by NT$393 million, NT$285 million and NT$270 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 (loss) for the years ended December 31, 2021, 2022 and 2023 by NT$867 million, NT$579 million and NT$722 million, respectively.

F-102

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, 2022 and 2023, accounts receivable from the top ten customers represent 56% and 67% 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.

F-103

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, 2022
	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
Payables	$	58,767,584	$	—	$	—	$	—	$	58,767,584
Guarantee deposits		238,416		3,867,087		169,419		26,482,079		30,757,001
Bonds payable (Note)		322,155		8,742,481		10,593,656		4,151,128		23,809,420
Long-term loans		3,246,153		8,425,744		7,798,280		3,031,293		22,501,470
Lease liabilities		658,092		1,222,822		1,207,385		4,299,914		7,388,213
Other financial liabilities		17,233,129		4,308,513		—		—		21,541,642
Total	$	80,465,529	$	26,566,647	$	19,768,740	$	37,964,414	$	164,765,330

	As of December 31, 2023
	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	$	13,780,612	$	—	$	—	$	—	$	13,780,612
Payables		52,202,821		—		—		—		52,202,821
Guarantee deposits		1,476,430		3,556,179		25,955,654		10,611,123		41,599,386
Bonds payable (Note)		14,797,772		10,980,506		12,321,345		2,132,963		40,232,586
Long-term loans		2,872,168		14,406,101		5,071,743		2,940,524		25,290,536
Lease liabilities		649,879		1,311,239		1,223,724		3,712,729		6,897,571
Total	$	85,779,682	$	30,254,025	$	44,572,466	$	19,397,339	$	180,003,512

F-104

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 were NT$3,213 million and NT$5,753 million as of December 31, 2022 and 2023, respectively. 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. As of December 31, 2022 and 2023, all of these contracts have been settled.

(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-105

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, 2022
	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	$	669,444	$	—	$	36,474	$	705,918
Financial assets at fair value through profit or loss, noncurrent		6,626,088		468,164		10,690,399		17,784,651
Financial assets at fair value through other comprehensive income, current		3,213,057		—		—		3,213,057
Financial assets at fair value through other comprehensive income, noncurrent		8,366,276		—		3,610,267		11,976,543
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		—		438,397		438,397

F-106

	As of December 31, 2023
	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	$	443,601	$	—	$	—	$	443,601
Financial assets at fair value through profit or loss, noncurrent		6,424,475		19,300		10,251,085		16,694,860
Financial assets at fair value through other comprehensive income, current		5,753,379		—		—		5,753,379
Financial assets at fair value through other comprehensive income, noncurrent		8,693,193		—		3,237,388		11,930,581
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		—		1,019,362		1,019,362

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 year ended December 31, 2022, there was no transfers between Level 1 and Level 2 fair value measurements. During the year ended December 31, 2023, as the private placement ordinary shares held by the Company’s subsidiary became publicly listed on the over-the-counter market in Taiwan in May 2023, the Company transferred NT$655 million of the financial assets at fair value through profit or loss measured at the end of the reporting period in the quarter from Level 2 to Level 1 fair value measurement.

F-107

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, 2022	$	3,584,326		$	2,580,246		$	3,464,652		$	234,936		$	9,864,160		$	2,351,603	$	151,859	$	2,503,462
Recognized in profit (loss)		(150,786	)		(328,602	)		519,572			(53,225	)		(13,041	)		—		—		—
Recognized in other comprehensive income (loss)		—			—			—			—			—			1,076,117		30,688		1,106,805
Acquisition		192,258			485,256			625,542			—			1,303,056			—		—		—
Disposal		(186,579	)		(15,782	)		(194,572	)		(149,850	)		(546,783	)		—		—		—
Return of capital		—			—			(26,672	)		—			(26,672	)		—		—		—
Transfer out of Level 3		(326,577	)		—			—			—			(326,577	)		—		—		—
Exchange effect		86,166			144,140			237,811			4,613			472,730			—		—		—
As of December 31, 2022	$	3,198,808		$	2,865,258		$	4,626,333		$	36,474		$	10,726,873		$	3,427,720	$	182,547	$	3,610,267

	Financial liabilities at fair value through profit or loss
	Derivatives
	NT$ (In Thousands)
As of January 1, 2022	$	2,380,599
Recognized in profit (loss)		(1,433,405	)
Derecognition		(508,797	)
As of December 31, 2022	$	438,397

F-108

	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			Others			Total			Common stock			Preferred stock			Total
	NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2023	$	3,198,808		$	2,865,258		$	4,626,333		$	36,474		$	—		$	10,726,873		$	3,427,720		$	182,547		$	3,610,267
Recognized in profit (loss)		(312,149	)		(277,994	)		(617,764	)		(8,828	)		—			(1,216,735	)		—			—			—
Recognized in other comprehensive income (loss)		—			—			—			—			—			—			(365,395	)		(7,484	)		(372,879	)
Acquisition		610,153			294,046			294,245			—			154,761			1,353,205			—			—			—
Disposal		—			(89,997	)		—			(27,740	)		—			(117,737	)		—			—			—
Return of capital		(1,384	)		—			(36,346	)		—			—			(37,730	)		—			—			—
Transfer out of Level 3		(461,403	)		—			—			—			—			(461,403	)		—			—			—
Exchange effect		2,230			(4,679	)		8,428			94			(1,461	)		4,612			—			—			—
As of December 31, 2023	$	3,036,255		$	2,786,634		$	4,274,896		$	—		$	153,300		$	10,251,085		$	3,062,325		$	175,063		$	3,237,388

	Financial liabilities at fair value through profit or loss
	Derivatives
	NT$ (In Thousands)
As of January 1, 2023	$	438,397
Recognized in profit (loss)		580,965
As of December 31, 2023	$	1,019,362

The total profit (loss) of NT$330 million, NT$(74) million and NT$(1,329) million for the years ended December 31, 2021, 2022 and 2023, 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 profit (loss) of NT$(360) million, NT$829 million and NT$(581) million for the years ended December 31, 2021, 2022 and 2023, 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-109

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, 2022
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, 2022 by NT$273 million and NT$198 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2022 by NT$248 million.
Embedded derivatives in exchangeable bonds	Binomial tree valuation model	Volatility	36.46%	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, 2022 by NT$77 million and NT$67 million, respectively.

F-110

As of December 31, 2023
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, 2023 by NT$261 million and NT$199 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2023 by NT$214 million.
Embedded derivatives in exchangeable bonds	Binomial tree valuation model	Volatility	27.70%	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, 2023 by NT$119 million and NT$131 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, exchange price, volatility, risk-free interest rates and risk discount 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 cash and cash equivalents, receivables, refundable deposits, other financial assets, short-term loans, payables and guarantee deposits approximate their carrying amount.

F-111

As of December 31, 2022
			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)	$	28,346,985	$	22,916,330	$	5,430,655	$	—	$	28,184,687
Long-term loans (current portion included)		19,279,342		—		19,279,342		—		19,279,342
As of December 31, 2023
			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)	$	38,367,168	$	32,827,211	$	5,539,957	$	—	$	38,359,352
Long-term loans (current portion included)		22,883,344		—		22,883,344		—		22,883,344

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. 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-112

(2) Geographic non-current assets information

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Taiwan	$	130,812,383	$	158,066,796
Singapore		29,080,766		55,322,448
China (includes Hong Kong)		37,213,538		33,424,815
Japan		10,736,562		13,415,669
Others		20,638		76,508
Total	$	207,863,887	$	260,306,236

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, 2021, 2022 and 2023 were as follows:

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Customer A	$	21,935,208	$	24,061,849	$	16,615,745
Customer B	$	14,707,370	$	22,226,167	$	29,242,973

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.

F-113

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, 2022 and 2023 were as follows:

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Total liabilities	$	201,834,635		$	202,859,864
Less: Cash and cash equivalents		(173,818,777	)		(132,553,615	)
Net debt		28,015,858			70,306,249
Total equity		322,810,948			343,716,968
Total capital	$	350,826,806		$	414,023,217
Debt to capital ratios		7.99%			16.98%

F-114

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, 2023
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.		99.01	%
United Microchip Corporation	Cayman Islands		100.00	%
Wavetek Microelectronics Corporation	Taiwan, R.O.C.		80.00	%
Everrich Energy Investment (HK) Limited	China		99.01	%
Everrich (Shandong) Energy Co., Ltd.	China		99.01	%
Wavetek Microelectronics Corporation (USA)	U.S.A.		80.00	%
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		99.9994	%
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 25, 2024

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 25, 2024

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 25, 2024

By:	/s/ Chitung Liu
	Name:  Chitung Liu
	Title:   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, 2023 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 25, 2024

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, 2023 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 25, 2024

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, 2023 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 25, 2024

By:	/s/ Chitung Liu
	Name:	Chitung Liu
	Title:	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.

EX-15.1

Exhibit 15.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-269038) pertaining to the 2022 Plan Governing the Issuance of Restricted Stock Awards for Employees of United Microelectronics Corporation of our reports dated April 25, 2024, with respect to the consolidated financial statements of United Microelectronics Corporation and the effectiveness of internal control over financial reporting of United Microelectronics Corporation included in this Annual Report (Form 20-F) for the year ended December 31, 2023.

/s/ Ernst & Young

Taipei, Taiwan,

Republic of China

April 25, 2024

EX-97.1

Exhibit 97.1

INCENTIVE-BASED COMPENSATION

CLAWBACK POLICY

Adopted as of October 2, 2023

The Board of Directors (the “Board”) of United Microelectronics Corporation (the “Company”) believes that it is in the best interests of the Company and its shareholders to adopt this Clawback Policy (the “Policy”), which provides for the recovery of certain incentive compensation in the event of a Material Financial Restatement (as defined below).

1. Overview

The Policy sets forth the circumstances and procedures under which the Company shall recover Erroneously Awarded Compensation from current and former Executive Officers of the Company in accordance with rules issued by the United States Securities and Exchange Commission (the “SEC”) under the Securities Exchange Act of 1934 (the “Exchange Act”) and the New York Stock Exchange (the “NYSE”). Please refer to Section 3 below for definitions of capitalized terms used and not otherwise defined herein.

2. Compensation Recovery Requirement

In the event the Company is required to prepare a Material Financial Restatement, the Company shall reasonably and promptly recover all Erroneously Awarded Compensation with respect to such Material Financial Restatement, and each Covered Person shall be required to take actions necessary to enable such recovery.

3. Definitions

a. “Applicable Recovery Period” means with respect to a Material Financial Restatement, the three (3) completed fiscal years immediately preceding the Restatement Date for such Material Financial Restatement.

b. A “Covered Person” means any person who was an Executive Officer at any time during the Applicable Recovery Period for which Incentive-Based Compensation is received.

c. “Incentive-Based Compensation” means any compensation provided, directly or indirectly, by the Company or any of its subsidiaries that is granted, earned, or vested based, in whole or in part, upon the attainment of a Financial Reporting Measure. Incentive-Based Compensation is deemed received, earned or vested when the Financial Reporting Measure is attained, not when the actual payment, grant or vesting occurs.

d. “Effective Date” means the earlier of (i) October 2, 2023 and (ii) the date on which the Board of Directors approves this Policy.

e. “Erroneously Awarded Compensation” means, with respect to a Material Financial Restatement, the amount of any Incentive-Based Compensation received by a Covered Person on or after the Effective Date during the Applicable Recovery Period that exceeds

the amount that otherwise would have been received by the Covered Person had such compensation been determined based on the restated amounts in the Material Financial Restatement, computed without regard to any taxes paid. Calculation of Erroneously Awarded Compensation with respect to Incentive-Based Compensation based on stock price or total shareholder return, where the amount of Erroneously Awarded Compensation is not subject to mathematical recalculation directly from the information in a Material Financial Restatement, shall be based on a reasonable estimate of the effect of the Material Financial Restatement on the stock price or total shareholder return upon which the Incentive-Based Compensation was received, and the Company shall maintain documentation of the determination of such reasonable estimate and provide such documentation to the Exchange in accordance with the Applicable Rules.

f. “Exchange” mean New York Stock Exchange.

g. “Executive Officers” means each individual who is currently or was previously designated as an “officer” of the Company as defined in Rule 16a-1(f) under the Exchange Act, including, at a minimum, the Company’s president, principal financial officer, principal accounting officer (or if there is no such accounting officer, the controller), any vice president of the Company in charge of a principal business unit, division or function (such as sales, administration, or finance), any other officer who performs a policy-making function, or any other person who performs similar significant policy-making functions for the Company or any subsidiaries.

h. “Applicable Rules” means any rules or regulations adopted by the NYSE pursuant to Rule 10D-1 under the Exchange Act and any applicable rules or regulations adopted by the SEC pursuant to Section 10D of the Exchange Act.

i. “Financial Reporting Measures” mean measures that are determined and presented in accordance with the accounting principles used in preparing the Company’s financial statements, any measures that are derived wholly or in part from such measures (including, for example, a non-GAAP financial measure). Financial Reporting Measures also include stock price and total shareholder return.

j. A “Material Financial Restatement” means an accounting restatement due to the material noncompliance of the Company with any financial reporting requirement under the securities laws, including any required accounting restatement to correct an error in previously-issued financial statements that is material to the previously-issued financial statements or that would result in a material misstatement if the error were corrected in the current period or left uncorrected in the current period.

k. “Restatement Date” means, with respect to a Material Financial Restatement, the earlier to occur of: (i) the date the Board or the Audit Committee of the Board concludes, or reasonably should have concluded, that the Company is required to prepare the Material Financial Restatement or (ii) the date a court, regulator or other legally authorized body directs the Company to prepare the Material Financial Restatement.

4. Exception to Compensation Recovery Requirement

The Company may elect not to recover Erroneously Awarded Compensation pursuant to this Policy if the Remuneration Committee (the “Committee”) determines that recovery would be impracticable, and one or more of the following conditions, together with any further requirements set forth in the Applicable Rules, are met: (i) the direct expense paid to a third party to assist in enforcing this Policy would exceed the amount to be recovered, and the Company has made a reasonable attempt to recover such Erroneously Awarded Compensation and provided documentation of its attempts to recover to the Exchange; (ii) pursuing such recovery would violate the Company’s home country laws and the Company provides an opinion of counsel to that effect to the Exchange; or (iii) recovery would likely cause an otherwise tax-qualified retirement plan, under which benefits are broadly available to employees, to fail to meet the requirements of Section 401(a)(13) or Section 411(a) of the Internal Revenue Code of 1986, as amended, and U.S. Treasury regulations promulgated thereunder.

5. Tax Considerations

To the extent that, pursuant to this Policy, the Company is entitled to recover any Erroneously Awarded Compensation that is received by a Covered Person, the gross amount received (i.e., the amount the Covered Person received, or was entitled to receive, before any deductions for tax withholding or other payments) shall be returned by the Covered Person.

6. No Indemnification

Notwithstanding anything to the contrary set forth in any agreement with, or the organizational documents of, the Company or any of its subsidiaries, Covered Persons are not entitled to indemnification for Erroneously Awarded Compensation recovered under this Policy and, to the extent any such agreement or organizational document purports to provide otherwise, Covered Persons hereby irrevocably agree to forego such indemnification. Further, the Company shall not pay or reimburse any Covered Persons for premiums incurred or paid for any insurance policy to fund such person’s potential recovery obligations.

7. Policy Interpretation

This Policy shall be interpreted in a manner that is consistent with the Applicable Rules and any other applicable law and shall otherwise be interpreted (including in the determination of amounts recoverable) in the business judgment of the Remuneration Committee (the “Committee”). The Committee shall take into consideration any applicable interpretations and guidance of the SEC in interpreting this Policy, including, for example, in determining whether a financial restatement qualifies as a Material Financial Restatement hereunder.

8. Policy Administration

This Policy shall be administered by the Committee. The Committee shall have such powers and authorities related to the administration of this Policy as are consistent with the governing documents of the Company and applicable law. The Committee shall have full power and authority to take, or direct the taking of, all actions and to make all determinations required or provided for under this Policy and shall have full power and authority to take, or direct the taking of, all such other actions and make all such other determinations not inconsistent with the specific terms and provisions of this Policy that the Committee deems to be necessary or appropriate to the administration of this Policy. The interpretation and construction by the Committee of any provision of this Policy and all determinations made by the Committee under this policy shall be final and binding.

XML

Cover	12 Months Ended
	Dec. 31, 2023 shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Registrant Name	United Microelectronics Corporation
Entity Central Index Key	0001033767
Entity Current Reporting Status	Yes
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	12,529,822,160
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 2nd Road
Entity Address, Address Line Two	Hsinchu Science Park
Entity Address, City or Town	Hsinchu
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	300094
Auditor Name	Ernst & Young
Auditor Firm ID	1443
Auditor Location	Taipei, Taiwan
Document Financial Statement Error Correction [Flag]	false
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	114066

XML

Consolidated Balance Sheets $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Current assets
Cash and cash equivalents	$ 132,553,615	$ 4,328,988	$ 173,818,777
Financial assets at fair value through profit or loss, current	443,601	14,487	705,918
Financial assets at fair value through other comprehensive income, current	5,753,379	187,896	3,213,057
Financial assets measured at amortized cost, current	6,131,077	200,231	861,817
Contract assets, current	739,528	24,152	373,318
Accounts receivable, net	29,237,550	954,851	36,444,510
Accounts receivable-related parties, net	347,964	11,364	530,577
Other receivables	2,707,400	88,419	1,807,999
Current tax assets	130,123	4,250	40,256
Inventories, net	35,712,558	1,166,315	31,069,960
Other current assets	3,040,597	99,301	3,504,849
Total current assets	216,797,392	7,080,254	252,371,038
Non-current assets
Financial assets at fair value through profit or loss, noncurrent	16,694,860	545,227	17,784,651
Financial assets at fair value through other comprehensive income, noncurrent	11,930,581	389,634	11,976,543
Financial assets measured at amortized cost, noncurrent	222,691	7,273	7,491
Investments accounted for under the equity method	32,785,800	1,070,731	26,504,913
Property, plant and equipment	239,123,248	7,809,381	170,982,066
Right-of-use assets	7,000,355	228,620	7,611,991
Intangible assets	4,372,555	142,801	4,275,200
Deferred tax assets	5,130,411	167,551	5,226,236
Prepayment for equipment	4,725,583	154,330	19,439,559
Refundable deposits	2,708,823	88,466	2,749,691
Other noncurrent assets	5,084,533	166,053	5,716,204
Total non-current assets	329,779,440	10,770,067	272,274,545
Total assets	546,576,832	17,850,321	524,645,583
Current liabilities
Short-term loans	13,530,000	441,868	0
Financial liabilities at fair value through profit or loss, current	1,019,362	33,291	438,397
Contract liabilities, current	3,250,712	106,163	3,546,815
Accounts payable	7,526,159	245,792	8,982,418
Other payables	25,670,984	838,373	31,279,208
Payables on equipment	19,196,256	626,919	18,632,245
Current tax liabilities	9,539,764	311,553	19,450,909
Lease liabilities, current	514,324	16,797	537,314
Other financial liabilities, current	0	0	17,226,490
Current portion of long-term liabilities	16,006,797	522,756	7,586,644
Other current liabilities	5,642,792	184,285	4,928,283
Total current liabilities	101,897,150	3,327,797	112,608,723
Non-current liabilities
Contract liabilities, noncurrent	430,640	14,064	438,188
Bonds payable	24,579,651	802,732	23,083,096
Long-term loans	20,656,248	674,600	16,794,289
Deferred tax liabilities	5,631,964	183,931	3,562,436
Lease liabilities, noncurrent	4,878,863	159,336	5,199,781
Net defined benefit liabilities, noncurrent	2,205,085	72,014	2,869,402
Guarantee deposits	40,122,956	1,310,351	30,518,585
Other noncurrent liabilities	2,457,307	80,252	6,760,135
Total non-current liabilities	100,962,714	3,297,280	89,225,912
Total liabilities	202,859,864	6,625,077	201,834,635
Commitments and contingencies
Capital
Common stock	125,298,222	4,092,039	125,047,490
Additional paid-in capital
Premiums	3,997,662	130,557	3,215,160
Treasury stock transactions	8,277,564	270,332	7,425,869
Transactions with noncontrolling interests	3,156,983	103,102	534,109
Share-based payment	2,373,830	77,526	2,221,709
Other	19,396	633	1,746,172
Retained earnings
Legal reserve	30,472,125	995,171	21,566,986
Special reserve	2,734,058	89,290	4,914,214
Unappropriated earnings	176,391,220	5,760,653	169,725,371
Other components of equity
Exchange differences on translation of foreign operations	(8,439,670)	(275,626)	(6,369,416)
Unrealized gains or losses on financial assets measured at fair value through other comprehensive income	10,889,828	355,644	2,892,583
Unearned employee compensation	(1,991,331)	(65,033)	(1,831,030)
Treasury stock	(9,803,778)	(320,176)	(8,621,948)
Total equity attributable to the parent company	343,376,109	11,214,112	322,467,269
Non-controlling interests	340,859	11,132	343,679
Total equity	343,716,968	11,225,244	322,810,948
Total liabilities and equity	$ 546,576,832	$ 17,850,321	$ 524,645,583

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
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	12,529,822,000	12,504,749,000

XML

Consolidated Statements of Comprehensive Income $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 TWD ($) $ / shares	Dec. 31, 2021 TWD ($) $ / shares
Statement of comprehensive income [abstract]
Operating revenues	$ 222,533,000	$ 7,267,570	$ 278,705,264	$ 213,011,018
Operating costs	(144,789,162)	(4,728,581)	(152,940,887)	(140,961,389)
Gross profit	77,743,838	2,538,989	125,764,377	72,049,629
Operating expenses
Sales and marketing expenses	(3,225,154)	(105,328)	(4,182,929)	(4,671,599)
General and administrative expenses	(7,477,037)	(244,188)	(9,672,613)	(7,989,860)
Research and development expenses	(13,283,830)	(433,829)	(12,953,534)	(12,934,836)
Expected credit impairment gains (losses)	130,518	4,263	(2,723)	6,121
Subtotal	(23,855,503)	(779,082)	(26,811,799)	(25,590,174)
Net other operating income and expenses	4,002,326	130,709	5,339,647	5,226,831
Operating income	57,890,661	1,890,616	104,292,225	51,686,286
Non-operating income and expenses
Interest income	4,853,124	158,495	2,022,314	575,719
Other income	1,773,498	57,920	2,163,043	1,653,006
Other gains and losses	223,096	7,286	(1,134,540)	866,130
Finance costs	(1,570,374)	(51,286)	(1,866,329)	(1,962,930)
Share of profit or loss of associates and joint ventures	4,307,614	140,680	1,626,103	5,193,495
Bargain purchase gain in acquisition of equity investee	494,001	16,133	0	0
Exchange gain, net	478,784	15,636	2,522,844	484,726
Subtotal	10,559,743	344,864	5,333,435	6,810,146
Income from continuing operations before income tax	68,450,404	2,235,480	109,625,660	58,496,432
Income tax expense	(8,311,270)	(271,433)	(19,326,895)	(7,918,252)
Net income	60,139,134	1,964,047	90,298,765	50,578,180
Items that will not be reclassified subsequently to profit or loss
Remeasurements of defined benefit pension plans	402,234	13,136	296,804	(197,477)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income	5,530,359	180,612	(4,646,064)	5,811,342
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss	1,610,116	52,584	(1,694,965)	2,959,130
Income tax related to items that will not be reclassified subsequently	(414,395)	(13,533)	(6,999)	(417,076)
Subtotal	7,128,314	232,799	(6,051,224)	8,155,919
Items that may be reclassified subsequently to profit or loss
Exchange differences on translation of foreign operations	(2,386,278)	(77,932)	9,292,308	(4,741,016)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss	(74,418)	(2,430)	91,442	(24,412)
Income tax related to items that may be reclassified subsequently	390,428	12,751	859,566	29,938
Subtotal	(2,070,268)	(67,611)	10,243,316	(4,735,490)
Total other comprehensive income (loss)	5,058,046	165,188	4,192,092	3,420,429
Total comprehensive income (loss)	65,197,180	2,129,235	94,490,857	53,998,609
Net income (loss) attributable to:
Shareholders of the parent	59,688,950	1,949,345	89,478,805	51,246,425
Non-controlling interests	450,184	14,702	819,960	(668,245)
Net income	60,139,134	1,964,047	90,298,765	50,578,180
Comprehensive income (loss) attributable to:
Shareholders of the parent	64,747,010	2,114,533	93,670,889	54,666,873
Non-controlling interests	450,170	14,702	819,968	(668,264)
Total comprehensive income (loss)	$ 65,197,180	$ 2,129,235	$ 94,490,857	$ 53,998,609
Earnings per share (NTD)
Earnings per share-basic | (per share)	$ 4.92	$ 0.16	$ 7.4	$ 4.27
Earnings per share-diluted | (per share)	$ 4.82	$ 0.16	$ 7.16	$ 4.19

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Consolidated Statements of Changes in Equity $ in Thousands, $ in Thousands	TWD ($)	USD ($)	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 ($)	Unearned Employee Compensation [Member] TWD ($)	Treasury Stock [member] TWD ($)	Equity attributable to the parent company [member] TWD ($)	Non-controlling Interests [member] TWD ($)
Balance at Dec. 31, 2020	$ 223,139,562		$ 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)
Special reserve reversed						(2,857,666)	2,857,666
Cash dividends	(19,875,842)						(19,875,842)					(19,875,842)
Net income (loss)	50,578,180						51,246,425					51,246,425	(668,245)
Other comprehensive income (loss)	3,420,429						(148,768)	(4,735,471)	8,304,687			3,420,448	(19)
Total comprehensive income (loss)	53,998,609						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)
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
Disposal of equity instruments investments measured at fair value through other comprehensive income	0
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		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
Impact of retroactive applications at Dec. 31, 2021	(219,932)						(153,843)					(153,843)	(66,089)
Adjusted balance at Dec. 31, 2021	264,155,115		124,832,476	50,080,596	15,734,416	8,164,648	83,001,915	(16,612,724)	9,201,181	(2,212,441)	(8,192,044)	263,998,023	157,092
Appropriation and distribution of retained earnings
Legal reserve					5,832,570		(5,832,570)
Special reserve reversed						(3,250,434)	3,250,434
Cash distributed from additional paid-in capital	(37,446,370)			(37,446,370)								(37,446,370)
Net income (loss)	90,298,765						89,478,805					89,478,805	819,960
Other comprehensive income (loss)	4,192,092						258,171	10,243,308	(6,309,395)			4,192,084	8
Total comprehensive income (loss)	94,490,857						89,736,976	10,243,308	(6,309,395)			93,670,889	819,968
Share-based payment transaction	1,351,738		215,014	755,313			(1,490)			381,411		1,350,248	1,490
Share of changes in net assets of associates and joint ventures accounted for using equity method	55,392			55,392			(797)		797			55,392
Changes in subsidiaries' ownership	(430,436)						(429,097)					(429,097)	(1,339)
Adjustments due to reciprocal stockholdings held by subsidiaries and associates	205,857			635,761							(429,904)	205,857
Disposal of equity instruments investments measured at fair value through other comprehensive income	0
Non-Controlling Interests	5,456												5,456
Others	423,339			1,062,327								1,062,327	(638,988)
Balance at Dec. 31, 2022	322,810,948		125,047,490	15,143,019	21,566,986	4,914,214	169,725,371	(6,369,416)	2,892,583	(1,831,030)	(8,621,948)	322,467,269	343,679
Appropriation and distribution of retained earnings
Legal reserve					8,905,139		(8,905,139)
Special reserve reversed						(2,180,156)	2,180,156
Cash dividends	(45,017,096)						(45,017,096)					(45,017,096)
Net income (loss)	60,139,134	$ 1,964,047					59,688,950					59,688,950	450,184
Other comprehensive income (loss)	5,058,046	165,188					327,156	(2,070,254)	6,801,158			5,058,060	(14)
Total comprehensive income (loss)	65,197,180	2,129,235					60,016,106	(2,070,254)	6,801,158			64,747,010	450,170
Share-based payment transaction	1,026,023		250,732	934,945			(5,170)		0	(160,301)		1,020,206	5,817
Share of changes in net assets of associates and joint ventures accounted for using equity method	17,396			46,265			403,488		(432,357)			17,396
Disposal of investments accounted for under the equity method	5			5			(56)		56			5
The differences between the fair value of the consideration paid or received from acquiring or disposing subsidiaries and the carrying amounts of the subsidiaries	2,572,818			2,572,818								2,572,818
Changes in subsidiaries' ownership	(288,284)			3,485			(292,225)					(288,740)	456
Adjustments due to reciprocal stockholdings held by subsidiaries and associates	(415,962)			851,695			(85,827)				(1,181,830)	(415,962)
Disposal of equity instruments investments measured at fair value through other comprehensive income	(1,628,388)						(1,628,388)		1,628,388
Non-Controlling Interests	4,187												4,187
Others	(2,190,247)			(1,726,797)								(1,726,797)	(463,450)
Balance at Dec. 31, 2023	$ 343,716,968	$ 11,225,244	$ 125,298,222	$ 17,825,435	$ 30,472,125	$ 2,734,058	$ 176,391,220	$ (8,439,670)	$ 10,889,828	$ (1,991,331)	$ (9,803,778)	$ 343,376,109	$ 340,859

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Consolidated Statements of Cash Flows $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Cash flows from operating activities:
Net income before tax	$ 68,450,404	$ 2,235,480	$ 109,625,660	$ 58,496,432
Adjustments to reconcile net income before tax to net cash provided by operating activities:
Depreciation	37,757,556	1,233,101	41,328,374	44,179,632
Amortization	2,726,481	89,043	2,841,334	2,894,942
Expected credit impairment losses (gains)	(130,518)	(4,263)	2,723	(6,121)
Net loss (gain) of financial assets and liabilities at fair value through profit or loss	40,553	1,324	1,247,962	(2,892,470)
Interest expense	1,473,729	48,130	1,785,311	1,868,089
Interest income	(4,853,124)	(158,495)	(2,022,314)	(575,719)
Dividend income	(1,773,498)	(57,920)	(2,163,043)	(1,653,006)
Share-based payment	1,031,896	33,700	1,351,738	1,745,745
Share of profit of associates and joint ventures	(4,307,614)	(140,680)	(1,626,103)	(5,193,495)
Gain on disposal of property, plant and equipment	(268,293)	(8,762)	(482,983)	(143,735)
Loss (gain) on disposal of investments accounted for under the equity method	(163,395)	(5,336)	(50,553)	16,388
Loss on repurchases of bonds	0	0	203,851	0
Exchange loss (gain) on financial assets and liabilities	85,353	2,788	2,436,159	(505,434)
Bargain purchase gain in acquisition of equity investee	(494,001)	(16,133)	0	0
Loss (gain) on lease modification	(113)	(4)	(1,162)	6
Amortization of deferred government grants	(2,663,843)	(86,997)	(4,163,746)	(4,069,055)
Others	0	0	0	243,447
Income and expense adjustments	28,461,169	929,496	40,687,548	35,909,214
Changes in operating assets and liabilities:
Financial assets and liabilities at fair value through profit or loss	1,945,525	63,538	14,825	119,904
Contract assets	(381,105)	(12,446)	(47,842)	(81,887)
Notes receivable and accounts receivable	7,201,939	235,204	(1,115,482)	(8,590,622)
Other receivables	(526,223)	(17,186)	(914,736)	134,111
Inventories	(4,944,756)	(161,488)	(7,637,528)	(871,589)
Other current assets	939,912	30,696	(4,041,038)	(227,852)
Contract fulfillment costs	(164,316)	(5,366)	(97,027)	(71,828)
Contract liabilities	(267,858)	(8,748)	(252,594)	1,637,105
Accounts payable	(1,341,114)	(43,799)	490,949	688,652
Other payables	(5,683,081)	(185,600)	9,230,484	4,092,040
Other current liabilities	1,470,483	48,023	791,279	(506,837)
Net defined benefit liabilities	(262,084)	(8,559)	(711,115)	(482,809)
Other noncurrent liabilities	(89,593)	(2,926)	(8,039)	71,430
Cash generated from operations	94,809,302	3,096,319	146,015,344	90,315,464
Interest received	4,579,972	149,575	1,852,783	505,379
Dividend received	3,649,805	119,197	4,132,529	3,006,829
Interest paid	(1,027,500)	(33,557)	(1,422,337)	(1,539,069)
Income tax paid	(16,011,870)	(522,922)	(4,717,790)	(1,936,712)
Net cash provided by operating activities	85,999,709	2,808,612	145,860,529	90,351,891
Cash flows from investing activities:
Acquisition of financial assets at fair value through profit or loss	(1,182,248)	(38,610)	(1,041,792)	(921,916)
Proceeds from disposal of financial assets at fair value through profit or loss	525,237	17,153	773,318	439,145
Acquisition of financial assets measured at amortized cost	(6,296,321)	(205,628)	(1,682,788)	(37,141,310)
Proceeds from redemption of financial assets measured at amortized cost	678,907	22,172	30,179,933	22,132,639
Proceeds from disposal of investments accounted for under the equity method	293,266	9,578	0	0
Proceeds from capital reduction of investments accounted for under the equity method	1,303,106	42,557	0	0
Increase in prepayment for investments	0	0	0	(5,025)
Proceeds from capital reduction of financial assets at fair value through other comprehensive income	0	0	0	42,150
Disposal of subsidiary	0	0	0	714,358
Acquisition of property, plant and equipment	(91,473,668)	(2,987,383)	(80,127,628)	(48,034,633)
Proceeds from disposal of property, plant and equipment	323,385	10,561	669,282	216,314
Increase in refundable deposits	(44,100)	(1,440)	(558,491)	(274,015)
Decrease in refundable deposits	83,856	2,739	186,175	220,750
Acquisition of intangible assets	(2,546,516)	(83,165)	(2,756,155)	(1,924,924)
Government grants related to assets acquisition	591,086	19,304	173,909	2,498,984
Increase in other noncurrent assets	(42,532)	(1,389)	(243,084)	(125,917)
Decrease in other noncurrent assets	0	0	55	0
Net cash used in investing activities	(97,786,542)	(3,193,551)	(54,427,266)	(62,163,400)
Cash flows from financing activities:
Increase in short-term loans	29,120,960	951,044	228,980	7,205,015
Decrease in short-term loans	(15,590,960)	(509,176)	(2,194,664)	(16,179,231)
Cash payments for the principal portion of the lease liability	(666,439)	(21,765)	(712,854)	(699,680)
Proceeds from bonds issued	10,000,000	326,584	0	25,760,800
Bonds issuance costs	(10,755)	(351)	0	(57,108)
Redemption of bonds	0	0	(13,305,050)	(2,000,000)
Proceeds from long-term loans	15,416,130	503,466	2,319,371	15,560,661
Repayments of long-term loans	(11,558,426)	(377,480)	(21,135,630)	(11,472,124)
Increase in guarantee deposits	11,651,109	380,506	15,823,396	14,812,963
Decrease in guarantee deposits	(1,227,764)	(40,097)	(838,455)	(593,555)
Decrease in other financial liabilities	(21,209,443)	(692,666)	0	0
Cash dividends and cash distributed from additional paid-in capital	(45,014,783)	(1,470,110)	(37,445,300)	(19,871,129)
Change in non-controlling interests	4,187	137	5,456	23,430
Others	0	0	0	65
Net cash provided by (used in) financing activities	(29,086,184)	(949,908)	(57,254,750)	12,490,107
Effect of exchange rate changes on cash and cash equivalents	(392,145)	(12,807)	7,018,133	(2,104,503)
Net increase (decrease) in cash and cash equivalents	(41,265,162)	(1,347,654)	41,196,646	38,574,095
Cash and cash equivalents at beginning of year	173,818,777	5,676,642	132,622,131	94,048,036
Cash and cash equivalents at end of year	$ 132,553,615	$ 4,328,988	$ 173,818,777	$ 132,622,131

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History and Organization

12 Months Ended

Dec. 31, 2023

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 2nd Road, Hsinchu Science Park, Hsinchu, 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, 2023

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 24, 2024.

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New Accounting Pronouncement under International Financial Reporting Standards (IFRSs)

12 Months Ended

Dec. 31, 2023

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, 2023. There are 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
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
Amendments to IAS 1 “Presentation of Financial Statements” - Classification of Liabilities as Current or Non-current and Non-current Liabilities with Covenants	January 1, 2024
Amendments to IFRS 16 “Leases” - Lease Liability in a Sale and Leaseback	January 1, 2024
Amendments to IAS 7 “Statement of Cash Flows” and IFRS 7 “Financial Instruments: Disclosures” - Supplier Finance Arrangements	January 1, 2024
Amendments to IAS 21 “The Effects of Changes in Foreign Exchange Rates” - Lack of Exchangeability	January 1, 2025
IFRS 18 “Presentation and Disclosure in Financial Statements”	January 1, 2027

(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. Amendments to 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

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.

b. Amendments to IAS 1 “Presentation of Financial Statements” (IAS 1) - Classification of Liabilities as Current or Non-current (“2020 amendments”) and Non-current Liabilities with Covenants (“2022 amendments”)

The 2020 amendments 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.

The 2022 amendments improved the information companies provide about long-term debt with covenants. The amendments specify that covenants to be complied within twelve months after the reporting period do not affect the classification of debt as current or non-current at the end of the reporting period.

c. Amendments to IFRS 16 “Leases” (IFRS 16) - Lease Liability in a Sale and Leaseback

The amendments add seller-lessee additional requirements for the sale and leaseback transactions in IFRS 16, thereby supporting the consistent application of the standard.

d. Amendments to IAS 7 “Statement of Cash Flows” and IFRS 7 “Financial Instruments: Disclosures” - Supplier Finance Arrangements

The amendments introduced additional information of supplier finance arrangements and added disclosure requirements for such arrangements.

e. Amendments to IAS 21 “The Effects of Changes in Foreign Exchange Rates” - Lack of Exchangeability

These amendments specify whether a currency is exchangeable into another currency and, when it is not, to determining the exchange rate to use and the disclosures to provide. The amendments apply for annual reporting periods beginning on or after January 1, 2025.

f. IFRS 18 “Presentation and Disclosure in Financial Statements”

The main changes in the new standard are as below:

(1) Improved comparability in the statement of profit or loss (income statement)

IFRS 18 requires entities to classify all income and expenses within their statement of profit or loss into one of five categories: operating; investing; financing; income taxes; and discontinued operations. The first three categories are new, to improve the structure of the income statement, and requires all entities to provide new defined subtotals, including operating profit. The improved structure and new subtotals will give investors a consistent starting point for analyzing entities’ performance and make it easier to compare entities.

(2) Enhanced transparency of management-defined performance measures

IFRS 18 requires entities to disclose explanations of those entity-specific measures that are related to the income statement, referred to as management-defined performance measures.

(3) Useful grouping of information in the financial statements

IFRS 18 sets out enhanced guidance on how to organize information and whether to provide it in the primary financial statements or in the notes. The changes are expected to provide more detailed and useful information. IFRS 18 also requires entities to provide more transparency about operating expenses, helping investors to find and understand the information they need.

IFRS 18 replaces IAS 1 Presentation of Financial Statements. IFRS 18 is effective for annual reporting periods beginning on or after January 1, 2027.

The Company is currently evaluating the potential impact of the aforementioned standards and interpretations listed (e) and (f) 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.

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Summary of Material Accounting Policies

12 Months Ended

Dec. 31, 2023

Disclosure Of Summary Of Material Accounting Policies [Abstract]

Summary of Material Accounting Policies

4. SUMMARY OF MATERIAL 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, 2022 and 2023 were as follows:

			Percentage of ownership (%) As of December 31,
Investor	Subsidiary	Business nature	2022		2023
UMC	UMC GROUP (USA)	IC Sales		100.00		100.00
UMC	UNITED MICROELECTRONICS (EUROPE) B.V. (UME BV)	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. (UMC KOREA)	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. (USJC)	Sales and manufacturing of integrated circuits		100.00		100.00
UMC and FORTUNE	WAVETEK MICROELECTRONICS CORPORATION (WAVETEK)	Sales and manufacturing of integrated circuits		80.14		80.00
TLC	SOARING CAPITAL CORP.	Investment holding		100.00		100.00
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		99.01
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
WAVETEK	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		—		100.00
WAVETEK	WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA)	Investment holding		100.00		—
WAVETEK-SAMOA	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		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		71.86		100.00

(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 “Financial Instruments” (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 NTD 30.62 on December 29, 2023 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) 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.

(12) 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.

(13) Property, Plant and Equipment

Property, plant and equipment are stated at cost, net of accumulated depreciation and accumulated impairment losses, if any. The cost of an item of property, plant and equipment comprises the acquisition cost, the costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management, and the initial estimate of costs for dismantling, removing the item and restoring the site on which it is located. 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 depreciation of the assets is calculated mainly over the following estimated useful lives: buildings - 20 to 56 years; machinery and equipment - 6 years; transportation equipment - 6 years; furniture and fixtures - 6 years; leasehold improvement - the shorter of lease terms or useful lives.

(14) 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.

(15) 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 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.

(16) 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.

(17) Bonds

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.

(18) 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.

(19) 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.

(20) Provision

Provisions are recognized when the Company has a present obligation (legal or constructive) as a result of a past event, it is probable that an outflow of resources embodying economic benefits will be required to settle the obligation and a reliable estimate can be made of the amount of the obligation. Where the Company expects some or all of a provision to be reimbursed, the reimbursement is recognized as a separate asset when, and only when it is virtually certain that reimbursement will be received. If the effect of the time value of money is material, provisions are discounted using a current pre-tax rate that reflects current market assessments of the time value of money and the risks specific to the liability. Where discounting is used, the increase in the provision due to the passage of time is recognized as a finance cost.

Decommissioning Liabilities

The amount of the decommissioning liability, arising from dismantling, removing the items of property, plant and equipment and restoring the site on which they are located, are provided at the present value of expected costs to settle the obligation using estimated cash flows, while the decommissioning costs are recognized as part of the cost of the particular items. The discount rate shall be a pre-tax rate that reflects current market assessments of the time value of money and the risks specific to the decommissioning liability. The periodic unwinding of the discount shall be recognized in profit or loss as a finance cost as it occurs. The estimated future costs of decommissioning are reviewed at the end of each reporting period and adjusted as appropriate. Changes in the estimated future costs or in the discount rate applied are added to or deducted from the cost of the items of property, plant and equipment.

Onerous contracts

An onerous contract is a contract in which the unavoidable costs of meeting the obligations under the contract exceed the economic benefits expected to be received under it. The present obligation under the onerous contract shall be recognized and measured as a provision. The unavoidable costs under a contract reflect the least net cost of exiting from the contract, which is the lower of the cost of fulfilling it and any compensation or penalties arising from failure to fulfill it. The aforementioned cost of fulfilling a contract comprises the costs that relate directly to the contract, which includes the incremental costs of fulfilling that contract and the allocation of other costs that relate directly to fulfilling contracts.

(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 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 that, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss and does not give rise to equal taxable and deductible temporary differences;

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 that, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss and does not give rise to equal taxable and deductible temporary differences;

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.

According to the temporary exception in the International Tax Reform – Pillar Two Model Rules (Amendments to IAS 12 “Income Taxes”), deferred tax assets and liabilities related to Pillar Two income tax will not be recognized nor disclosed.

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 number of shares outstanding 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, 2023

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. 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(6). 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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Contents of Significant Accounts

12 Months Ended

Dec. 31, 2023

Contents Of Significant Accounts [Abstract]

Contents of Significant Accounts

6. CONTENTS OF SIGNIFICANT ACCOUNTS

(1) Cash and Cash Equivalents

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Cash on hand and petty cash	$	6,023	$	6,200
Checking and savings accounts		42,422,443		50,322,942
Time deposits		125,467,386		80,276,114
Repurchase agreements collateralized by government bonds and corporate notes		5,922,925		1,948,359
Total	$	173,818,777	$	132,553,615

(2) Financial Assets at Fair Value through Profit or Loss

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets mandatorily measured at fair value through profit or loss
Common stocks	$	10,275,563	$	9,170,230
Preferred stocks		2,939,939		2,862,119
Funds		5,044,702		4,472,097
Convertible bonds		230,365		480,715
Others		—		153,300
Total	$	18,490,569	$	17,138,461
Current	$	705,918	$	443,601
Non-current		17,784,651		16,694,860
Total	$	18,490,569	$	17,138,461

(3) Financial Assets at Fair Value through Other Comprehensive Income

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Equity instruments
Common stocks	$	15,007,053	$	17,508,897
Preferred stocks		182,547		175,063
Total	$	15,189,600	$	17,683,960
Current	$	3,213,057	$	5,753,379
Non-current		11,976,543		11,930,581
Total	$	15,189,600	$	17,683,960

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	2022		2023
		NT$		NT$
		(In Thousands)		(In Thousands)
Common stock	SILICON INTEGRATED SYSTEMS CORP.	$	2,316,197	$	—
Common stock	UNIMICRON HOLDING LIMITED		2,847,385		2,514,120
Common stock	ITE TECH. INC.		1,023,266		2,100,977
Common stock	CHIPBOND TECHNOLOGY CORPORATION		3,051,603		3,843,744
Common stock	NOVATEK MICROELECTRONICS CORP. (NOVATEK)		5,188,267		8,501,851
Common stock	SHIN-ETSU HANDOTAI TAIWAN CO., LTD.		580,335		548,205
Preferred stock	MTIC HOLDINGS PTE. LTD.		182,547		175,063

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.

b. Dividend income recognized in profit or loss from equity instruments designated as fair value through other comprehensive income were listed below:

	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Held at end of period	$	1,431,931	$	1,052,336
Derecognized during the period		—		142,535
Total	$	1,431,931	$	1,194,871

Please refer to Note 6(7) for derecognition of the equity instrument investment in SILICON INTEGRATED SYSTEMS CORP. (SIS) during the period.

c. The Company reclassified its equity instrument investment in SIS as investments accounted for under the equity method. Details on derecognition of such investments are as follow:

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Fair value on the date of disposal	$	—	$	—	$	3,035,999
Cumulative gains (losses) reclassified to retained earnings due to derecognition	$	—	$	—	$	(1,628,388	)

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) Financial assets measured at amortized cost

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets measured at amortized cost
Time deposits with original maturities over three months	$	849,308	$	6,353,768
Bonds		20,000		—
Total	$	869,308	$	6,353,768
Current	$	861,817	$	6,131,077
Non-current		7,491		222,691
Total	$	869,308	$	6,353,768

(5)  Accounts Receivable, Net
	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Accounts receivable	$	36,653,611		$	29,316,612
Less: loss allowance		(209,101	)		(79,062	)
Net	$	36,444,510		$	29,237,550

Aging analysis of accounts receivable:
	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Neither past due	$	30,545,437	$	25,707,008
Past due:
≤ 30 days		5,303,765		3,008,126
31 to 60 days		130,408		78,668
61 to 90 days		3,247		5,599
91 to 120 days		7,886		—
≥ 121 days		662,868		517,211
Subtotal		6,108,174		3,609,604
Total	$	36,653,611	$	29,316,612

Movement of loss allowance for accounts receivable:
	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Beginning balance	$	194,491	$	209,101
Net recognition (reversal) for the period		14,610		(130,039	)
Ending balance	$	209,101	$	79,062

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, 2021, 2022 and 2023, 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.

(6) Inventories, Net

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Raw materials	$	6,335,428	$	10,995,569
Supplies and spare parts		7,161,216		6,443,172
Work in process		14,897,926		15,560,517
Finished goods		2,675,390		2,713,300
Total	$	31,069,960	$	35,712,558

a. For the years ended December 31, 2021, 2022 and 2023, the Company recognized NT$135,856 million, NT$145,979 million and NT$136,902 million, respectively, in operating costs, of which NT$426 million in 2021 was related to reversal of write-down of inventories, and NT$98 million and NT$1,148 million in 2022 and 2023, respectively, were related to write-down of inventories.

b. None of the aforementioned inventories were pledged.

(7) Investments Accounted for Under the Equity Method

a. Details of investments accounted for under the equity method are as follows:

	As of December 31,
	2022				2023
Investee companies	Amount		Percentage of ownership or voting rights		Amount		Percentage of ownership or voting rights
	NT$				NT$
	(In Thousands)				(In Thousands)
Listed companies
SILICON INTEGRATED SYSTEMS CORP. (SIS) (Note A)	$	—		—	$	2,373,060		19.02
FARADAY TECHNOLOGY CORP. (FARADAY) (Note B)		1,862,245		13.78		1,990,073		13.78
UNIMICRON TECHNOLOGY CORP. (UNIMICRON) (Note C)		13,285,169		13.27		13,644,560		13.05
Unlisted companies
MTIC HOLDINGS PTE. LTD. (Note D)		—		45.44		—		45.44
UNITECH CAPITAL INC.		426,070		42.00		625,667		42.00
TRIKNIGHT CAPITAL CORPORATION (TRIKNIGHT) (Note E)		2,117,678		40.00		2,109,906		40.00
HSUN CHIEH CAPITAL CORP.		210,690		40.00		235,098		40.00
PURIUMFIL INC.		14,622		40.00		11,474		40.00
HSUN CHIEH INVESTMENT CO., LTD. (HSUN CHIEH) (Note F)		2,980,984		36.49		4,126,878		36.49
YANN YUAN INVESTMENT CO., LTD. (YANN YUAN)		5,455,743		26.78		7,516,327		26.78
UNITED LED CORPORATION HONG KONG LIMITED		97,156		25.14		93,793		25.14
VSENSE CO., LTD. (Note D)		—		23.98		—		23.98
TRANSLINK CAPITAL PARTNERS I, L.P. (Note G)		54,556		10.38		58,964		10.38
Total	$	26,504,913			$	32,785,800

Note A: In August 2023, the board chairman of SIS changed and became the same person as the board chairman of UMC. After considering the comprehensive conditions, including ownership interest held and representation on Board of Directors of SIS, etc., the Company determines that it has significant influence over SIS and accounts for its investment in SIS as an associate. SIS was previously measured at fair value through other comprehensive income and reclassified as investments accounted for under the equity method. UMC’s share of the net fair value of SIS’s identifiable assets and liabilities was in excess of the fair value of the previously held investment in SIS at the acquisition date, and the difference was recognized as bargain purchase gain. Cumulative fair value change that was previously recognized in other comprehensive loss up to reclassification date was reclassified to retained earnings in the current period.

Note B: Beginning from June 2015, the Company accounts for its investment in FARADAY as an associate given the fact that UMC obtained the ability to exercise significant influence over FARADAY through representation on its Board of Directors.

Note C: Beginning from June 2020, the Company accounts for its investment in UNIMICRON as an associate given the fact that UMC obtained the ability to exercise significant influence over UNIMICRON through representation on its Board of Directors. On January 6, 2023, UNIMICRON issued new shares to merge with SUBTRON TECHNOLOGY CO., LTD. (SUBTRON) through share conversion. The share conversion ratio was 1 common share of SUBTRON to exchange 0.219 common shares of UNIMICRON. The 23 million shares of SUBTRON held by the Company were exchanged to 5 million common shares newly issued by UNIMICRON.

Note D: 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 E: TRIKNIGHT executed a capital reduction and refunded NT$400 million and NT$560 million based on UMC’s stockholding percentage in June and December 2023, respectively. UMC’s stockholding percentage remains unchanged.

Note F: HSUN CHIEH executed a capital reduction and refunded NT$343 million based on UMC’s stockholding percentage in April 2023. UMC’s stockholding percentage remains unchanged.

Note G: 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$15,147 million and NT$18,008 million, as of December 31, 2022 and 2023, respectively. The fair value of these investments were NT$28,416 million and NT$53,726 million as of December 31, 2022 and 2023, 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 has 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. 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, 2021, 2022 and 2023 were NT$(30) million, NT$103 million and NT$(3) 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,
	2021		2022			2023
	NT$		NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)
Profit from continuing operations	$	5,193,495	$	1,626,103		$	4,307,614
Other comprehensive income (loss)		2,965,202		(1,706,960	)		1,540,436
Total comprehensive income (loss)	$	8,158,697	$	(80,857	)	$	5,848,050

(8) Property, Plant and Equipment

a. 2022

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, 2022	$	1,491,343		$	36,827,480		$	897,806,699		$	55,959	$	7,305,174		$	61,282		$	22,856,033		$	966,403,970
Additions		—			325,943			—			—		—			—			72,270,938			72,596,881
Disposals		—			(69,897	)		(6,391,003	)		—		(27,782	)		(2,414	)		(69,640	)		(6,560,736	)
Transfers and reclassifications		—			219,666			46,548,734			8,154		730,317			421			(39,772,778	)		7,734,514
Exchange effect		(21,127	)		294,577			15,855,258			810		54,284			3,786			79,390			16,266,978
As of December 31, 2022	$	1,470,216		$	37,597,769		$	953,819,688		$	64,923	$	8,061,993		$	63,075		$	55,363,943		$	1,056,441,607
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, 2022	$	—		$	21,184,969		$	810,904,881		$	47,108	$	6,222,383		$	55,125		$	—		$	838,414,466
Depreciation		—			1,443,545			38,565,229			3,946		456,017			2,816			—			40,471,553
Disposals		—			(69,489	)		(6,331,532	)		—		(27,421	)		(2,404	)		—			(6,430,846	)
Transfers and reclassifications		—			161			(4,913	)		—		(176	)		—			—			(4,928	)
Exchange effect		—			172,320			14,604,120			543		46,714			3,846			—			14,827,543
As of December 31, 2022	$	—		$	22,731,506		$	857,737,785		$	51,597	$	6,697,517		$	59,383		$	—		$	887,277,788
Net carrying amount:
As of December 31, 2022	$	1,470,216		$	14,866,263		$	96,081,903		$	13,326	$	1,364,476		$	3,692		$	55,363,943		$	169,163,819

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, 2022	$	549,010		$	2,422,389		$	—	$	1,312,703		$	4,284,102
Disposals		—			—			—		(660	)		(660	)
Transfers and reclassifications		—			(1,226	)		6,345		15,562			20,681
Exchange effect		(3,223	)		22,084			—		6,686			25,547
As of December 31, 2022	$	545,787		$	2,443,247		$	6,345	$	1,334,291		$	4,329,670
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, 2022	$	—		$	1,095,113		$	—	$	1,236,790		$	2,331,903
Depreciation		—			94,644			—		60,229			154,873
Disposals		—			—			—		(660	)		(660	)
Transfers and reclassifications		—			(161	)		6,345		211			6,395
Exchange effect		—			13,216			—		5,696			18,912
As of December 31, 2022	$	—		$	1,202,812		$	6,345	$	1,302,266		$	2,511,423
Net carrying amount:
As of December 31, 2022	$	545,787		$	1,240,435		$	—	$	32,025		$	1,818,247

b. 2023

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, 2023	$	1,470,216		$	37,597,769		$	953,819,688		$	64,923		$	8,061,993		$	63,075		$	55,363,943		$	1,056,441,607
Additions		—			223,177			—			—			—			—			82,213,765			82,436,942
Disposals		—			(12,160	)		(6,475,636	)		—			(112,396	)		—			(33,581	)		(6,633,773	)
Transfers and reclassifications		—			902,122			77,170,979			7,104			953,582			3,379			(54,194,544	)		24,842,622
Exchange effect		(39,878	)		(341,045	)		(3,016,210	)		(315	)		(29,711	)		(631	)		(990,932	)		(4,418,722	)
As of December 31, 2023	$	1,430,338		$	38,369,863		$	1,021,498,821		$	71,712		$	8,873,468		$	65,823		$	82,358,651		$	1,152,668,676
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, 2023	$	—		$	22,731,506		$	857,737,785		$	51,597		$	6,697,517		$	59,383		$	—		$	887,277,788
Depreciation		—			1,416,727			35,031,869			4,924			490,468			4,149			—			36,948,137
Disposals		—			(12,160	)		(6,468,067	)		—			(112,330	)		—			—			(6,592,557	)
Exchange effect		—			(107,933	)		(2,212,913	)		(264	)		(19,642	)		(494	)		—			(2,341,246	)
As of December 31, 2023	$	—		$	24,028,140		$	884,088,674		$	56,257		$	7,056,013		$	63,038		$	—		$	915,292,122
Net carrying amount:
As of December 31, 2023	$	1,430,338		$	14,341,723		$	137,410,147		$	15,455		$	1,817,455		$	2,785		$	82,358,651		$	237,376,554

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, 2023	$	545,787		$	2,443,247		$	6,345	$	1,334,291		$	4,329,670
Transfers and reclassifications		—			—			—		54,469			54,469
Exchange effect		(6,084	)		(2,330	)		—		(3,020	)		(11,434	)
As of December 31, 2023	$	539,703		$	2,440,917		$	6,345	$	1,385,740		$	4,372,705

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, 2023	$	—	$	1,202,812		$	6,345	$	1,302,266		$	2,511,423
Depreciation		—		94,944			—		23,395			118,339
Exchange effect		—		(688	)		—		(3,063	)		(3,751	)
As of December 31, 2023	$	—	$	1,297,068		$	6,345	$	1,322,598		$	2,626,011
Net carrying amount:
As of December 31, 2023	$	539,703	$	1,143,849		$	—	$	63,142		$	1,746,694

c. Details of interest expense capitalized were as follows:

	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Interest expense capitalized	$	1,661	$	9,355
Interest rates applied		1.44% - 1.61%		1.48% - 1.65%

d. 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 31 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,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Land (including land use right)	$	5,714,166	$	5,318,986
Buildings		124,420		156,483
Machinery and equipment		1,748,244		1,506,824
Transportation equipment		21,485		16,356
Other equipment		3,676		1,706
Net	$	7,611,991	$	7,000,355
	For the years ended December 31,
	2022		2023
	NT$		NT$
Depreciation	(In Thousands)		(In Thousands)
Land (including land use right)	$	359,007	$	377,593
Buildings		119,641		93,610
Machinery and equipment		206,445		203,606
Transportation equipment		12,287		13,267
Other equipment		4,568		3,004
Total	$	701,948	$	691,080

i. For the years ended December 31, 2022 and 2023, the Company’s addition to right-of-use assets amounted to NT$1,130 million and NT$206 million, respectively.

ii. Please refer to Note 8 for right-of-use assets pledged as collateral.

(b) Lease Liabilities

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Current	$	537,314	$	514,324
Non-current		5,199,781		4,878,863
Total	$	5,737,095	$	5,393,187

Please refer to Note 6(24) 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

2022

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, 2022	$	15,012	$	4,845,037		$	4,491,164		$	3,348,071		$	12,699,284
Additions		—		2,713,534			—			480,880			3,194,414
Write-off		—		(1,857,289	)		(1,344,682	)		(869,940	)		(4,071,911	)
Reclassifications		—		(10,721	)		—			—			(10,721	)
Exchange effect		—		(20,774	)		275,950			(5,027	)		250,149
As of December 31, 2022	$	15,012	$	5,669,787		$	3,422,432		$	2,953,984		$	12,061,215

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, 2022	$	7,398	$	2,913,824		$	3,324,667		$	2,808,462		$	9,054,351
Amortization		—		1,656,765			475,870			556,965			2,689,600
Write-off		—		(1,857,289	)		(1,344,682	)		(869,940	)		(4,071,911	)
Exchange effect		—		(23,903	)		141,658			(3,780	)		113,975
As of December 31, 2022	$	7,398	$	2,689,397		$	2,597,513		$	2,491,707		$	7,786,015
Net carrying amount:
As of December 31, 2022	$	7,614	$	2,980,390		$	824,919		$	462,277		$	4,275,200

2023

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, 2023	$	15,012	$	5,669,787		$	3,422,432		$	2,953,984		$	12,061,215
Additions		—		1,399,699			346,896			999,510			2,746,105
Write-off		—		(1,498,642	)		(1,826,383	)		(632,860	)		(3,957,885	)
Reclassifications		—		(5,855	)		—			—			(5,855	)
Exchange effect		—		(98,912	)		(169,404	)		(9,993	)		(278,309	)
As of December 31, 2023	$	15,012	$	5,466,077		$	1,773,541		$	3,310,641		$	10,565,271

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, 2023	$	7,398	$	2,689,397		$	2,597,513		$	2,491,707		$	7,786,015
Amortization		—		1,741,898			277,768			535,944			2,555,610
Write-off		—		(1,498,642	)		(1,826,383	)		(632,860	)		(3,957,885	)
Exchange effect		—		(41,822	)		(139,933	)		(9,269	)		(191,024	)
As of December 31, 2023	$	7,398	$	2,890,831		$	908,965		$	2,385,522		$	6,192,716
Net carrying amount:
As of December 31, 2023	$	7,614	$	2,575,246		$	864,576		$	925,119		$	4,372,555

The amortization amounts of intangible assets were as follows:

	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Operating costs	$	1,329,850	$	1,144,960
Operating expenses	$	1,359,750	$	1,410,650

(11) Short-Term Loans

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Unsecured bank loans	$	—	$	13,530,000
	As of December 31,
	2022		2023
Interest rates applied		—		1.69% - 2.65%

(12) Financial Liabilities at Fair Value through Profit or Loss, Current

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Embedded derivatives in exchangeable bonds	$	438,397		$	1,019,362

(13) Bonds Payable

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured domestic bonds payable	$	23,100,000		$	33,100,000
Unsecured exchangeable bonds payable		5,757,373			5,757,373
Less: Discounts on bonds payable		(672,686	)		(498,021	)
Total		28,184,687			38,359,352
Less: Current or exchangeable portion due within one year		(5,101,591	)		(13,779,701	)
Net	$	23,083,096		$	24,579,651

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
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 was paid annually and the principal was fully repaid in March 2022.
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 was paid annually and the principal was fully repaid in October 2022.
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.
Five-year (Green bond)	In mid-September 2023	NT$10,000 million		1.62%	Interest will be paid annually and the principal will be repayable in September 2028 upon maturity.

b. 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:

(i) 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 on 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. 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 NOVATEK 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$533.8 per NOVATEK common share on December 31, 2023.

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.

For the years ended December 31, 2022 and 2023, UMC has repurchased and cancelled the outstanding principal amount of exchangeable bonds totaling US$187.1 million and nil with derecognition of the related derivative financial liabilities, respectively. The difference between the repurchased amount and the carrying amount recognized in non-operating other gains and losses was immaterial.

(14) Long-Term Loans

a. Details of long-term loans as of December 31, 2022 and 2023 were as follows:

	As of December 31,
Lenders	2022		2023		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Long-Term Loan from Mega International Commercial Bank (1)	$	9,732	$	4,866	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)		18,000		13,765	Repayable quarterly from February 23, 2022 to February 22, 2027 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Mega International Commercial Bank (3)		60,500		46,265	Repayable quarterly from December 22, 2022 to February 23, 2027 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (1)		35,676		23,784	Repayable quarterly from October 19, 2015 to October 19, 2025 with monthly interest payments. Interest-only payment for the first year.

	As of December 31,
Lenders	2022		2023		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Long-Term Loan from Taiwan Cooperative Bank (2)		4,375		—	Repayable monthly from May 31, 2019 to May 31, 2023 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (3)		32,000		20,000	Repayable monthly from August 13, 2020 to August 13, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (4)		16,552		10,345	Repayable monthly from October 29, 2020 to August 29, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (5)		84,166		58,916	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 (6)		—		34,400	Repayable quarterly from December 28, 2023 to December 28, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Syndicated Loans from China Development Bank and 6 others (1)		1,915,577		—	Repayable semi-annually from October 20, 2016 to October 19, 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 (2)		12,415,200		11,766,832	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		35,668	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		21,000	Settlement due on December 25, 2026 with monthly interest payments.
Secured Long-Term Loan from Shanghai Commercial Bank (1)		22,200		16,650	Repayable monthly from January 19, 2022 to December 15, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Shanghai Commercial Bank (2)		—		4,980	Repayable quarterly from March 23, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Shanghai Commercial Bank (3)		—		45,000	Repayable quarterly from June 6, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from CTBC Bank		—		131,750	Repayable semi-annually from September 25, 2023 to September 25, 2028 with monthly interest payments. Interest-only payment for the first and the second year.
Unsecured Long-Term Loan from Bank of China		1,797,364		1,515,790	Repayable semi-annually from June 24, 2023 to June 24, 2026 with quarterly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan		2,000,000		1,333,333	Repayable quarterly from March 24, 2023 to December 24, 2025 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (1) (Note A)		300,000		—	Settlement due on February 25, 2026 with monthly interest payments.

	As of December 31,
Lenders	2022			2023			Redemption
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured Revolving Loan from First Commercial Bank (2) (Note A)		300,000			—		Settlement due on March 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (3) (Note A)		200,000			—		Settlement due on June 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (4) (Note B)		—			800,000		Settlement due on July 13, 2028 with monthly interest payments.
Unsecured Revolving Loan from Yuanta Commercial Bank (Note C)		—			3,000,000		Repayable annually from March 2, 2023 to March 2, 2026 with monthly interest payments.
Unsecured Revolving Loan from CTBC Bank (Note D)		—			4,000,000		Settlement due on July 20, 2025 with monthly interest payments.
Subtotal		19,279,342			22,883,344
Less: Current portion		(2,485,053	)		(2,227,096	)
Total	$	16,794,289		$	20,656,248
	As of December 31,
	2022			2023
Interest rates applied		1.48% - 5.62%			1.67% - 6.56%

Note A: First Commercial Bank approved the 1-year credit loan on April 14, 2022, which offered UMC a revolving line of credit of NT$2 billion starting from the approval date to April 13, 2023. As of December 31, 2022, the unused line of credit was NT$1.2 billion.

Note B: First Commercial Bank approved the 1-year credit loan on April 25, 2023, which offered UMC a revolving line of credit of NT$2 billion starting from the approval date to April 24, 2024. As of December 31, 2023, the unused line of credit was NT$1.2 billion.

Note C: 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, 2022 and 2023, the unused line of credit were NT$4 billion and nil, respectively.

Note D: UMC entered into a 5-year loan agreement with CTBC Bank, effective from December 24, 2021. The agreement offered UMC a revolving line of credit of NT$4 billion. The expiration date of the agreement is July 20, 2025. As of December 31, 2022 and 2023, the unused line of credit were NT$4 billion and nil, respectively.

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 amount of endorsement for the years ended December 31, 2022 and 2023 were NT$7,547 million and NT$2,934 million, respectively. As of December 31, 2022 and 2023, the actual amount provided were NT$2,407 million and NT$1,686 million, respectively.

d. In 2017, UMC resolved to provide endorsement for USCXM’s syndicated loan from banks including China Development Bank. The maximum amount of endorsement for the years ended December 31, 2022 and 2023 were NT$17,876 million and NT$10,351 million, respectively. As of December 31, 2022 and 2023, the actual amount provided were NT$7,878 million and NT$9,946 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$1,636 million, NT$1,880 million and NT$1,655 million were contributed by the Company for the years ended December 31, 2021, 2022 and 2023, 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, 2021, 2022 and 2023, total pension expenses of NT$23 million, NT$34 million and NT$45 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,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Defined benefit obligation at beginning of year	$	(5,458,333	)	$	(5,106,623	)
Items recognized as profit or loss:
Service cost		(9,911	)		(9,893	)
Interest cost		(33,842	)		(63,322	)
Subtotal		(43,753	)		(73,215	)
Remeasurements recognized in other comprehensive income (loss):
Arising from changes in financial assumptions		227,790			166,401
Experience adjustments		(56,959	)		226,634
Subtotal		170,831			393,035
Benefits paid		224,632			121,305
Defined benefit obligation at end of year	$	(5,106,623	)	$	(4,665,498	)

ii. Movements in fair value of plan assets during the year:

	For the years ended December 31,
	2022			2023
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance of fair value of plan assets	$	1,581,012		$	2,237,221
Items recognized as profit or loss:
Interest income on plan assets		9,802			27,742
Contribution by employer		745,066			307,556
Benefits paid		(224,632	)		(121,305	)
Remeasurements recognized in other comprehensive income (loss):
Return on plan assets, excluding amounts included in interest income		125,973			9,199
Fair value of plan assets at end of year	$	2,237,221		$	2,460,413

The actual returns on plan assets of the Company for the years ended December 31, 2022 and 2023 were NT$136 million and NT$37 million, respectively.

iii. The defined benefit plan recognized on the consolidated balance sheets were as follows:

	As of December 31,
	2022			2023
	NT$ (In Thousands)			NT$ (In Thousands)
Present value of the defined benefit obligation	$	(5,106,623	)	$	(4,665,498	)
Fair value of plan assets		2,237,221			2,460,413
Funded status		(2,869,402	)		(2,205,085	)
Net defined benefit liabilities, noncurrent recognized on the consolidated balance sheets	$	(2,869,402	)	$	(2,205,085	)

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,
	2022			2023
Cash		20	%		21	%
Equity instruments		47	%		46	%
Debt instruments		22	%		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,
	2022			2023
Discount rate		1.24	%		1.20	%
Rate of future salary increase		4.25	%		3.50	%

vi. Expected future benefit payments are as follows:

Year	As of December 31, 2023
	NT$ (In Thousands)
2024	$	596,934
2025		529,837
2026		486,833
2027		465,919
2028		434,293
2029 and thereafter		2,511,716
Total	$	5,025,532

The Company expects to make pension fund contribution of NT$700 million in 2024. The weighted-average durations of the defined benefit obligation were 7 years and 6 years as of December 31, 2022 and 2023, respectively.

vii. Sensitivity analysis:

	As of December 31, 2022
	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	$	172,801	$	(182,478	)	$	(151,050	)	$	145,000

	As of December 31, 2023
	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	$	137,615	$	(144,683	)	$	(117,784	)	$	113,478

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,
	2022			2023
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance	$	8,543,798		$	4,677,444
Arising during the period		174,352			591,086
Recorded in profit or loss:
Other operating income		(4,164,189	)		(2,663,843	)
Exchange effect		123,483			(57,665	)
Ending balance	$	4,677,444		$	2,547,022
Current (classified under other current liabilities)	$	2,681,842		$	717,457
Non-current (classified under other noncurrent liabilities)		1,995,602			1,829,565
Total	$	4,677,444		$	2,547,022

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,
	2022		2023
	NT$ (In Thousands)		NT$ (In Thousands)
Refund liabilities	$	1,139,227	$	3,033,576

(18)  Provisions

	As of December 31,
	2022		2023
	NT$ (In Thousands)		NT$ (In Thousands)
Onerous Contracts (classified under other current liabilities)	$	469,779	$	57,800
Decommissioning Liabilities (classified under other noncurrent liabilities)		366,863		602,433
Total	$	836,642	$	660,233

	Onerous Contracts			Decommissioning Liabilities
	NT$ (In Thousands)			NT$ (In Thousands)
Balance as of January 1, 2023	$	469,779		$	366,863
Arising during the period		40,154			191,360
Unused provision reversed		(450,968	)		—
Discount rate adjustment and unwinding of discount from the passage of time		—			47,880
Exchange effect		(1,165	)		(3,670	)
Balance as of December 31, 2023	$	57,800		$	602,433

When the Company expects that the unavoidable costs of fulfilling the contractual obligations exceed the expected economic benefits from the contracts, the present obligation under the onerous contract are recognized and measured as provisions.

Under certain applicable agreement, the Company is obligated to dismantling and removing the items of property, plant and equipment and restoring the site on which they are located. Accordingly, the Company recognized the liability pursuant to the present value of the estimated decommissioning and restoration cost.

(19) Equity

a. Capital stock:

i. UMC had 26,000 million common shares authorized to be issued as of December 31, 2022 and 2023, of which 12,505 million shares and 12,530 million shares were issued as of December 31, 2022 and 2023, respectively, each at a par value of NT$10.

ii. UMC had 135 million and 121 million ADSs, which were traded on the NYSE as of December 31, 2022 and 2023, respectively. The total number of common shares of UMC represented by all issued ADSs were 674 million shares and 607 million shares as of December 31, 2022 and 2023, respectively. One ADS represents five common shares.

iii. On December 5, 2022 and December 5, 2023, UMC issued restricted stocks for its employees in a total of 23 million shares and 27 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(20) for the information of restricted stocks.

iv. For the years ended December 31, 2022 and 2023, UMC has recalled and cancelled 2 million shares and 2 million shares, respectively of unvested 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.

b. Details of UMC’s stock (thousand shares) held by the Company’s associates are as follows:

	As of December 31,
	2022		2023
HSUN CHIEH		441,371		441,371
YANN YUAN		192,963		192,963
SUBTRON, the subsidiary of UNIMICRON (Note A)		—		47
SIS (Note B)		—		266,580
Total		634,334		900,961

Note A: Beginning from January 2023, SUBTRON becomes an associate of the Company.

Note B: Beginning from August 2023, SIS becomes an associate of the Company.

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 2022 was approved by the shareholders’ meeting held on May 31, 2023, while the appropriation of earnings for 2023 was proposed by the Board of Directors’ meeting on February 27, 2024. The details of appropriation were as follows:

	Appropriation of earnings (in thousand NT dollars)						Cash dividend per share (NT dollars)
	2022			2023			2022		2023
Legal reserve	$	8,905,139		$	6,255,736
Special reserve		(2,180,156	)		(2,734,057	)
Cash dividends		45,017,096			37,587,102		$	3.60	$	3.00

The aforementioned 2022 appropriation approved by shareholders’ meeting was consistent with the resolutions of the Board of Directors’ meeting held on February 22, 2023.

The cash dividend per share for 2022 was adjusted to NT$3.60046348 per share. The adjustment was due to the decrease of outstanding common shares from cancellation of the restricted stock in April 2023.

The appropriation of 2023 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(22) for information on the employees and directors’ compensation.

d. Non-controlling interests:

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Balance as of January 1	$	113,356		$	223,181		$	343,679
Impact of retroactive applications		—			(66,089	)		—
Adjusted balance as of January 1		113,356			157,092			343,679
Attributable to non-controlling interests:
Net income (loss)		(668,245	)		819,960			450,184
Other comprehensive income (loss)		(19	)		8			(14	)
Share-based payment transactions		—			1,490			5,817
Changes in subsidiaries’ ownership		(11,126	)		(1,339	)		456
Non-controlling interests		23,430			5,456			4,187
Derecognition of the non-controlling interests		765,785			(638,988	)		(463,450	)
Ending balance	$	223,181		$	343,679		$	340,859

(20) Share-Based Payment

a. 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. UMC 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 declaration 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 UMC are gradually eligible to the vested restricted stocks at certain percentage and time frame. For those employees who fail to fulfill the vesting conditions, UMC 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.

On May 27, 2022, the shareholders approved a compensation plan in their meeting to issue restricted stocks to qualified employees of the Company without consideration. The maximum shares to be issued are 50 million common shares. UMC is authorized to issue restricted stocks in one tranche or in installments, under the custody of trust institution, within two years from the date of receiving the effective declaration from the competent authority.

The issuance plan was authorized for effective registration by the Securities and Futures Bureau of the FSC and accordingly, 23 million shares and 27 million shares of restricted stock for employees were issued without consideration on December 5, 2022 and December 5, 2023, 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 UMC are gradually eligible to the vested restricted stocks at certain percentage and time frame. For those employees who fail to fulfill the vesting conditions, UMC 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 issued in 2020 and 2022 were measured at fair value based on the closing quoted market price of the shares on the grant date, NT$21.8, NT$53.0, NT$44.4 and NT$48.9 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, 2021, 2022 and 2023, the compensation costs of NT$1,520 million, NT$1,352 million and NT$1,025 million, respectively, were recognized in expenses by the Company.

b. 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 initially by using Black-Scholes Option Pricing Model and will be remeasured at the end of each reporting period until settlement. As of December 31, 2023, the assumptions used are as follows:

	Granted in September 2020		Granted in June 2021
Share price of measurement date (NT$/ per share)	$	52.60	$	52.60
Expected volatility		23.95%		23.21% - 28.72%
Expected life		0.67 years		0.44 - 1.44 years
Expected dividend yield		6.02%		6.02%
Risk-free interest rate		1.06%		1.06% - 1.08%

For the years ended December 31, 2021, 2022 and 2023, the compensation costs of NT$271 million, NT$210 million and NT$105 million, respectively, were recognized in expenses by the Company. The liabilities for stock appreciation right recognized which were classified under other payables and other noncurrent liabilities amounted to NT$340 million and NT$207 million as of December 31, 2022 and 2023, respectively. The intrinsic value for the liabilities of vested rights was nil.

(21) Operating Revenues

a. Disaggregation of revenue

i. By product

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Wafer	$	204,594,399	$	265,600,173	$	211,750,622
Others		8,416,619		13,105,091		10,782,378
Total	$	213,011,018	$	278,705,264	$	222,533,000

ii. By geography

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Taiwan	$	92,427,670		$	105,213,451		$	68,360,231
China (includes Hong Kong)		26,949,205			39,641,613			27,545,452
Japan		13,445,127			17,053,279			11,612,866
Korea		17,548,763			25,689,385			30,872,198
USA		46,914,605			67,352,671			59,103,051
Europe		15,708,303			23,711,284			24,932,099
Others		17,345			43,581			107,103
Total	$	213,011,018		$	278,705,264		$	222,533,000

Beginning from 2023, the geographic breakdown of the Company’s operating revenues is based on the location where the Company’s customers are headquartered, and the comparative information in respect of the preceding period is also presented on a consistent basis.

iii. By the timing of revenue recognition

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
At a point in time	$	211,074,982		$	276,175,120		$	220,283,306
Over time		1,936,036			2,530,144			2,249,694
Total	$	213,011,018		$	278,705,264		$	222,533,000

b. Contract balances

i. Contract assets, current

	As of January 1,			As of December 31,
	2022			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Sales of goods and services	$	677,326		$	766,691		$	1,132,477
Less: Loss allowance		(357,705	)		(393,373	)		(392,949	)
Net	$	319,621		$	373,318		$	739,528

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,
	2022		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Sales of goods and services	$	4,083,140	$	3,985,003	$	3,681,352
Current	$	3,441,754	$	3,546,815	$	3,250,712
Non-current		641,386		438,188		430,640
Total	$	4,083,140	$	3,985,003	$	3,681,352

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$3,112 million and NT$2,871 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, 2022 and 2023.

c. The Company’s transaction price allocated to unsatisfied performance obligations amounted to NT$223 million and NT$195 million as of December 31, 2022 and 2023, 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. 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, 2022 and 2023, the Company recognized costs to fulfill engineering service contracts eligible for capitalization as other current assets which amounted to NT$721 million and NT$877 million, respectively. Subsequently, the Company will expense from costs to fulfill a contract to operating costs when the related obligations are satisfied.

(22) Operating Costs and Expenses

The Company’s employee benefit, depreciation and amortization expenses are summarized as follows:

	For the years ended December 31,
	2021						2022						2023
	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	$	23,388,888	$	11,806,207	$	35,195,095	$	30,074,528	$	13,928,646	$	44,003,174	$	26,693,905	$	12,002,205	$	38,696,110
Labor and health insurance		1,183,315		458,179		1,641,494		1,368,803		471,788		1,840,591		1,502,553		557,543		2,060,096
Pension		1,259,044		399,879		1,658,923		1,489,076		424,752		1,913,828		1,240,577		460,079		1,700,656
Other employee benefit expenses		335,829		144,668		480,497		373,739		165,114		538,853		421,871		196,739		618,610
Depreciation		42,002,745		1,908,719		43,911,464		39,305,321		1,756,609		41,061,930		36,006,021		1,545,067		37,551,088
Amortization		834,384		2,060,558		2,894,942		1,470,912		1,370,422		2,841,334		1,277,920		1,448,561		2,726,481

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 recognized the employees and directors’ compensation in the profit or loss with corresponding other payables during the periods when earned for the years ended December 31, 2021, 2022 and 2023. 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 2021 and 2022 were reported to the shareholders’ meeting on May 27, 2022 and May 31, 2023, respectively, while the distributions of employees and directors’ compensation for 2023 were approved through the Board of Directors’ meeting on February 27, 2024. The details of distribution were as follows:

	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Employees’ compensation – Cash	$	4,770,909	$	9,160,485	$	5,439,059
Directors’ compensation		25,264		45,000		45,000

The aforementioned employees and directors’ compensation for 2021 and 2022 reported during the shareholders’ meeting were consistent with the resolutions of the Board of Directors’ meeting held on February 24, 2022 and February 22, 2023, 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.

(23) Net Other Operating Income and Expenses

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Government grants	$	5,269,412		$	5,058,658		$	3,862,001
Rental income from property, plant and equipment		187,166			192,833			202,082
Gain on disposal of property, plant and equipment		143,735			482,983			268,293
Others		(373,482	)		(394,827	)		(330,050	)
Total	$	5,226,831		$	5,339,647		$	4,002,326

(24) Non-Operating Income and Expenses

a. Other gains and losses

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Gain (Loss) on valuation of financial assets and liabilities at fair value through profit or loss	$	2,892,470		$	(1,247,962	)	$	(40,553	)
Gain (Loss) on disposal of investments accounted for under the equity method		(16,388	)		50,553			163,395
Others		(2,009,952	)		62,869			100,254
Total	$	866,130		$	(1,134,540	)	$	223,096

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.

b. Finance costs

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Interest expenses
Bonds payable	$	437,055	$	486,079	$	444,424
Bank loans		1,285,708		1,100,840		833,548
Lease liabilities		145,187		166,928		179,367
Others		139		31,464		16,390
Financial expenses		94,841		81,018		96,645
Total	$	1,962,930	$	1,866,329	$	1,570,374

(25) Components of Other Comprehensive Income (Loss)

	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

	For the year ended December 31, 2022
	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	$	296,804		$	—	$	296,804		$	(59,361	)	$	237,443
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		(4,646,064	)		—		(4,646,064	)		(71,121	)		(4,717,185	)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		(1,694,965	)		—		(1,694,965	)		123,483			(1,571,482	)
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		9,292,308			—		9,292,308			883,238			10,175,546
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		91,442			—		91,442			(23,672	)		67,770
Total other comprehensive income (loss)	$	3,339,525		$	—	$	3,339,525		$	852,567		$	4,192,092

	For the year ended December 31, 2023
	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	$	402,234		$	—		$	402,234		$	(80,447	)	$	321,787
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		5,530,359			—			5,530,359			(243,057	)		5,287,302
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		1,610,116			—			1,610,116			(90,891	)		1,519,225
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(2,386,278	)		—			(2,386,278	)		386,660			(1,999,618	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		(73,005	)		(1,413	)		(74,418	)		3,768			(70,650	)
Total other comprehensive income (loss)	$	5,083,426		$	(1,413	)	$	5,082,013		$	(23,967	)	$	5,058,046

(26) Income Tax

a. The major components of income tax expense (benefit) for the years ended December 31, 2021, 2022 and 2023 were as follows:

i. Income tax expense (benefit) recorded in profit or loss

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Current income tax expense (benefit):
Current income tax charge	$	7,088,975		$	17,582,039		$	6,426,598
Adjustments in respect of current income tax of prior periods		(150,260	)		(585,941	)		(217,891	)
Deferred income tax expense (benefit):
Deferred income tax related to origination and reversal of temporary differences		407,280			2,276,015			2,239,309
Deferred income tax related to recognition and derecognition of tax losses and unused tax credits		723,270			60,178			—
Adjustment of prior year’s deferred income tax		(130,841	)		8,611			(120,230	)
Deferred income tax arising from write-down or reversal of write-down of deferred tax assets		(20,172	)		(14,007	)		(16,516	)
Income tax expense recorded in profit or loss	$	7,918,252		$	19,326,895		$	8,311,270

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,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Remeasurements of defined benefit pension plans	$	39,495		$	(59,361	)	$	(80,447	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		(360,061	)		(71,121	)		(243,057	)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		(96,510	)		123,483			(90,891	)
Income tax related to items that will not be reclassified subsequently to profit or loss	$	(417,076	)	$	(6,999	)	$	(414,395	)

(ii)  Items that may be reclassified subsequently to profit or loss:
	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Exchange differences on translation of foreign operations	$	23,175		$	883,238		$	386,660
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		6,763			(23,672	)		3,768
Income tax related to items that may be reclassified subsequently to profit or loss	$	29,938		$	859,566		$	390,428
iii.   Income tax charged directly to equity
	For the years ended December 31,
	2021			2022			2023
	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):
Adjustments of changes in net assets of associates and joint ventures accounted for using equity method		22			(2,720	)		(1,117	)
Income tax charged directly to equity	$	(181	)	$	(2,720	)	$	(1,117	)

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,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Income before tax	$	58,496,432		$	109,625,660		$	68,450,404
At UMC’s statutory income tax rate		11,699,286			21,925,132			13,690,081
Adjustments in respect of current income tax of prior periods		(150,260	)		(585,941	)		(217,891	)
Net changes in loss carry-forward and investment tax credits		(845,267	)		(465,152	)		(2,179,234	)
Adjustment of deferred tax assets/liabilities for write-downs/reversals and different jurisdictional tax rates		183,123			(281,319	)		211,639
Tax effect of non-taxable income and non-deductible expenses:
Tax exempt income		(3,258,695	)		(4,384,566	)		(1,428,035	)
Investment loss (gain)		(1,388,877	)		1,827,822			(755,800	)
Dividend income		(171,725	)		(423,027	)		(323,182	)
Others		6,463			(340,745	)		(145,520	)
Basic tax		—			—			43,506
Estimated income tax on unappropriated earnings		1,558,031			1,247,910			(1,160,324	)
Effect of different tax rates applicable to UMC and its subsidiaries		116,174			605,929			234,510
Taxes withheld in other jurisdictions		43,443			35,979			38,346
Others		126,556			164,873			303,174
Income tax expense recorded in profit or loss	$	7,918,252		$	19,326,895		$	8,311,270

c. Significant components of deferred income tax assets and liabilities were as follows:

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Deferred income tax assets
Depreciation	$	2,056,568		$	2,396,554
Pension		569,193			436,129
Refund liabilities		138,617			306,408
Allowance for inventory valuation losses		507,621			682,909
Investment loss		474,405			314,427
Unrealized profit on intercompany sales		906,793			689,124
Others		573,039			304,860
Total deferred income tax assets		5,226,236			5,130,411
Deferred income tax liabilities
Depreciation		(70,133	)		(2,085,916	)
Investment gain		(2,648,989	)		(2,888,534	)
Amortizable assets		(298,451	)		(283,405	)
Others		(544,863	)		(374,109	)
Total deferred income tax liabilities		(3,562,436	)		(5,631,964	)
Net deferred income tax assets (liabilities)	$	1,663,800		$	(501,553	)

d. Movement of deferred tax

	For the years ended December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Balance as of January 1	$	3,154,352		$	1,663,800
Amounts recognized in profit or loss during the period		(2,330,797	)		(2,102,563	)
Amounts recognized in other comprehensive income (loss)		852,567			(23,967	)
Amounts recognized in equity		(2,720	)		(1,117	)
Exchange adjustments		(9,602	)		(37,706	)
Balance as of December 31	$	1,663,800		$	(501,553	)

e. The Company is subject to taxation in Taiwan and other foreign jurisdictions. As of December 31, 2023, income tax returns of UMC and its subsidiaries in Taiwan have been examined by the tax authorities through 2021, while in other foreign jurisdictions, relevant tax authorities have completed the examination through 2012.

f. 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.

g. 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,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Expiry period
1-5 years	$	35,263,925	$	15,395,514
6-10 years		1,995,256		22,128,180
Total	$	37,259,181	$	37,523,694

h. As of December 31, 2022 and 2023, deductible temporary differences for which no deferred income tax assets have been recognized amounted to NT$3,001 million and NT$3,410 million, respectively.

i. As of December 31, 2022 and 2023, the taxable temporary differences of unrecognized deferred tax liabilities associated with investments in subsidiaries amounted to NT$21,658 million and NT$20,389 million, respectively.

j. USJC, UMC KOREA and UME BV, the subsidiaries of UMC, are operating in jurisdictions where the Pillar Two legislation has been enacted or substantively enacted. However, the Pillar Two legislation is not yet implemented in the aforementioned jurisdictions as of December 31, 2023; therefore, the Company is not exposed to the income tax arising from the legislation for the year ended December 31, 2023. The average effective tax rate calculated in accordance with IAS 12 in the jurisdictions where USJC, UMC KOREA and UME BV operate is 27.70%, 3.55% and 20.12%, respectively, which is applicable to the accounting profits of NT$3,408 million, NT$2 million and NT$10 million, respectively, for the year ended December 31, 2023. 

(27) Earnings Per Share

a. Earnings per share-basic

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	51,246,425	$	89,478,805	$	59,688,950
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)		12,005,126		12,095,312		12,137,954
Earnings per share-basic (NTD)	$	4.27	$	7.40	$	4.92

b. Earnings per share-diluted

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	51,246,425	$	89,478,805	$	59,688,950
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)		12,005,126		12,095,312		12,137,954
Effect of dilution
Restricted stocks for employees		159,478		156,098		114,974
Employees’ compensation		80,243		238,242		129,196
Weighted-average number of ordinary shares after dilution (thousand shares)		12,244,847		12,489,652		12,382,124
Earnings per share-diluted (NTD)	$	4.19	$	7.16	$	4.82

(28) Reconciliation of Liabilities Arising from Financing Activities

For the year ended December 31, 2021

						Non-cash changes
Items	As of January 1, 2021		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 B	)  )		40,536,658
Guarantee deposits (current portion included)		235,992		14,219,408			(85,631	)		—			14,369,769 (Note C	)
Lease liabilities		5,576,864		(699,680	)		(144,419	)		335,989			5,068,754
Other financial liabilities (Note D)		20,746,624		—			(163,387	)		382,972			20,966,209

For the year ended December 31, 2022

						Non-cash changes
Items	As of January 1, 2022		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2022
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	1,924,124	$	(1,965,684	)	$	41,560		$	—		$	—
Long-term loans (current portion included)		36,624,907		(18,816,259	)		1,470,694			—			19,279,342
Bonds payable (current portion included)		40,536,658		(13,305,050	)		—			953,079 (Note B	)		28,184,687
Guarantee deposits (current portion included)		14,369,769		14,984,941			1,402,291			—			30,757,001 (Note C	)
Lease liabilities		5,068,754		(712,854	)		153,406			1,227,789 (Note E	)		5,737,095
Other financial liabilities (Note D)		20,966,209		—			306,902			176,376			21,449,487

For the year ended December 31, 2023

						Non-cash changes
Items	As of January 1, 2023		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2023
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	—	$	13,530,000		$	—		$	—		$	13,530,000
Long-term loans (current portion included)		19,279,342		3,857,704			(253,702	)		—			22,883,344
Bonds payable (current portion included)		28,184,687		9,989,245			—			185,420 (Note B	)		38,359,352
Guarantee deposits (current portion included)		30,757,001		10,423,345			419,040			—			41,599,386 (Note C	)
Lease liabilities		5,737,095		(666,439	)		(24,106	)		346,637			5,393,187
Other financial liabilities (Note D)		21,449,487		(21,209,443	)		(330,783	)		90,739			—

Note A: Other non-cash changes mainly consisted of discount amortization measured by the effective interest method.

Note B: Please refer to Note 6(13) for the Company’s exchangeable bonds.

Note C: Guarantee deposits mainly consisted of deposits of capacity reservation.

Note D: Please refer to Note 9(6) for more details on other financial liabilities.

Note E: Mainly due to the increase in land lease.

XML

Significant Related Party Transactions

12 Months Ended

Dec. 31, 2023

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, 2021

Entity	Counterparty	Transactions (Note A)
		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		—

For the year ended December 31, 2022

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	68,554,072		Net 60 days
UMC	UMC-USA	Accounts receivable		9,502,922		—
UMC	USCXM	Sales		1,143,280 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		16,774		—
UMC	UDS	Sales		656,472		Net 30 days
UMC	UDS	Accounts receivable		6,734		—
UMC	USJC	Sales		164,855		Net 60 days
UMC	USJC	Accounts receivable		151,430		—
USJC	UMC-USA	Sales		4,272,900		Net 60 days
USJC	UMC-USA	Accounts receivable		744,082		—
USCXM	UMC-USA	Sales		1,565,670		Net 60 days
USCXM	UMC-USA	Accounts receivable		310,431		—
USCXM	UMC	Sales		1,035,407		Net 30 days - Net 45 days
USCXM	UMC	Accounts receivable		173		—
USCXM	UDS	Sales		148,259		Month-end 30 days
USCXM	UDS	Accounts receivable		171		—
WAVETEK	UMC-USA	Sales		716,357		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		81,819		—
WAVETEK	UMC	Sales		124,178		Month-end 30 days
HJ	UMC-USA	Sales		551,913		Net 60 days
HJ	UMC-USA	Accounts receivable		147,265		—
HJ	UDS	Sales		311,972		Month-end 30 days
HJ	UDS	Accounts receivable		9,500		—

For the year ended December 31, 2023

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	61,923,652		Net 60 days
UMC	UMC-USA	Accounts receivable		5,827,800		—
UMC	USCXM	Sales		1,127,275 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		11,688		—
UMC	UDS	Sales		364,948		Net 30 days
UMC	UDS	Accounts receivable		10,800		—
USJC	UMC-USA	Sales		3,487,292		Net 60 days
USJC	UMC-USA	Accounts receivable		342,835		—
USCXM	UMC-USA	Sales		1,208,630		Net 60 days
USCXM	UMC-USA	Accounts receivable		17,816		—
USCXM	UMC	Sales		134,303		Net 30 days - Net 45 days
USCXM	UDS	Sales		286,087		Month-end 30 days
USCXM	UDS	Accounts receivable		362		—
WAVETEK	UMC-USA	Sales		505,806		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		53,916		—
HJ	UMC-USA	Sales		384,067		Net 60 days
HJ	UMC-USA	Accounts receivable		43,863		—
HJ	UDS	Sales		159,523		Month-end 30 days
HJ	UDS	Accounts receivable		2,696		—

Note A: The significant intercompany transactions listed above include downstream and upstream 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.

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
	UNIMICRON TECHNOLOGY CORP.	Associate
	SILICON INTEGRATED SYSTEMS CORP.	Associate (Note)
	PHOTRONICS DNP MASK CORPORATION	Other related party
	XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.	Directors and supervisors of subsidiaries
	FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP	Directors of subsidiaries

Note: Prior to August 2023, SIS held one board seat on UMC’s Board of Directors. Therefore, SIS was classified as other related party. Beginning from August 2023, the Company determines that it has significant influence over SIS and accounts for its investment in SIS as an associate. Please refer to Note 6(7) for the relevant information.

(ii) Operating revenues

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	2,778,544	$	5,744,098	$	3,018,171
Other related party		38,797		40,474		4,463
Total	$	2,817,341	$	5,784,572	$	3,022,634

(iii) Accounts receivable, net

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates
FARADAY TECHNOLOGY CORP. and its Subsidiaries
FARADAY TECHNOLOGY CORP.	$	441,963	$	302,828
ARTERY TECHNOLOGY CORPORATION, LTD.		56,864		40,886
Others		30,698		3,602
Other associates		—		648
Other related party		1,052		—
Total	$	530,577	$	347,964

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 30 - 60 days.

(iv) Refund liabilities (classified under other current liabilities)

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	1,545	$	636
Other related party		7		—
Total	$	1,552	$	636

(v) Significant asset transactions

Acquisition of financial assets at fair value through profit or loss, noncurrent

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

For the years ended December 31, 2022 and 2023: None.

Acquisition of subsidiaries’ ownership

For the years ended December 31, 2021 and 2022: None.

For the year ended December 31, 2023:

	Trading Capital Amount		Transaction underlying		Purchase price
	RMB¥				NT$
	(In Thousands)				(In Thousands)
XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.		3,741,862		Ownership of USCXM	$	17,945,970
FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP		674,762		Ownership of USCXM		3,263,473
Total		4,416,624			$	21,209,443

Please refer to Note 9(6) for the relevant information.

Acquisition of investments accounted for under the equity method

For the years ended December 31, 2021 and 2022: None.

For the year ended December 31, 2023:

	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		4,945	Stock of UNIMICRON	$	608,224

Please refer to Note 6(7) for the relevant information.

Acquisition of intangible assets

	Purchase price
	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
FARADAY TECHNOLOGY CORP.	$	181,254	$	266,053	$	323,551
(vi)  Others
Mask expenditure
	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Other related party	$	1,861,438	$	2,581,409	$	2,375,225
Other payables of mask expenditure
	As of December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Other related party	$	560,042	$	812,185	$	751,763

c. Key management personnel compensation

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Short-term employee benefits	$	562,117	$	2,047,118	$	1,462,964
Post-employment benefits		2,322		2,782		2,732
Share-based payment		1,035,401		719,786		500,391
Others		578		649		618
Total	$	1,600,418	$	2,770,335	$	1,966,705

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Assets Pledged as Collateral

12 Months Ended

Dec. 31, 2023

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,
	2022		2023		Party to which asset(s) was pledged	Purpose of pledge
	NT$		NT$
	(In Thousands)		(In Thousands)
Refundable Deposits (Time deposit)	$	812,248	$	813,289	Customs	Customs duty guarantee
Refundable Deposits (Time deposit)		236,587		236,556	Science Park Bureau	Collateral for land lease
Refundable Deposits (Time deposit)		29,371		18,647	Science Park Bureau	Collateral for dormitory lease
Refundable Deposits (Time deposit)		64,950		64,950	National Property Administration, Ministry of Finance	Guarantee for the application of national non-public use land for development
Refundable Deposits (Time deposit)		8,118		8,118	Bureau of Land Administration, Tainan City Government	Guarantee for the application of national non-public use land for development
Refundable Deposits (Time deposit)		34,100		36,970	Liquefied Natural Gas Business Division, CPC Corporation, Taiwan	Energy resources guarantee
Refundable Deposits (Time deposit)		1,043,840		1,006,852	Bank of China and Agricultural Bank of China	Bank performance guarantee
Refundable Deposits (Time deposit)		459,750		459,900	CTBC Bank Singapore Branch	Collateral for letter of credit
Buildings		4,828,597		4,487,730	Taiwan Cooperative Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Machinery and equipment		14,066,044		6,627,761	Taiwan Cooperative Bank, Mega International Commercial Bank, KGI Bank, First Commercial Bank, Shanghai Commercial Bank, CTBC Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Transportation equipment		592		—	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Furniture and fixtures		46,823		—	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Right-of-use assets		278,230		266,650	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Total	$	21,909,250	$	14,027,423

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Significant Contingencies and Unrecognized Contract Commitments

12 Months Ended

Dec. 31, 2023

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, 2023, amounts available under unused letters of credit were NT$33.2 billion.

(2) As of December 31, 2023, the Company entrusted financial institutions to open performance guarantee, mainly related to the litigations, electricity supply and customs tax guarantee, amounting to NT$2.2 billion.

(3) The Company entered into several patent license agreements and development contracts of intellectual property for a total contract amount of approximately NT$3.8 billion. As of December 31, 2023, the portion of royalties and development fees not yet recognized was NT$1.2 billion.

(4) The Company entered into several construction contracts for the expansion of its operations. As of December 31, 2023, these construction contracts amounted to approximately NT$70.6 billion and the portion of the contracts not yet recognized was approximately NT$38.4 billion.

(5) The Company entered into several wafer fabrication 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, the Company repurchases 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.

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, GE, to purchase the shares of USCXM from XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD. In addition, the Company’s subsidiary, HJ, 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¥4.9 billion. The transaction was completed all at once in July, 2023.

(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) and of MICRON MEMORY TAIWAN CO., LTD. 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 January 27, 2024, UMC completed the probation period successfully and the sentence has been terminated.

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 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 application for injunctive procedure. On March 28, 2024, the court approved UMC’s withdrawal of actions and the application for injunctive procedure.

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.

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Significant Subsequent Events

12 Months Ended

Dec. 31, 2023

Disclosure of non-adjusting events after reporting period [abstract]

Significant Subsequent Events

10. SIGNIFICANT SUBSEQUENT EVENTS

(1) On January 25, 2024, UMC and INTEL CORPORATION (INTEL) announced to collaborate on the development of a 12-nanometer semiconductor process platform to address high-growth markets such as mobile, communication infrastructure and networking. The long-term agreement brings together INTEL’s at-scale U.S. manufacturing capacity and UMC’s extensive foundry experience on mature nodes to enable an expanded process portfolio. It also offers global customers greater choice in their sourcing decisions with access to a more geographically diversified and resilient supply chain.

(2) On February 27, 2024, the Board of Directors of UMC approved to participate in the capital increase of the Company’s subsidiary, UMC CAPITAL CORP., and UMC has completed the investment in the amount of US$22 million in April 2024. 

(3) On February 27, 2024, the Board of Directors of the Company’s subsidiary, UMC CAPITAL CORP., approved an investment in 7V AI CAPITAL LLC, with amount not more than US$20 million.

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Financial Risk and Fair Value Disclosures

12 Months Ended

Dec. 31, 2023

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	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets at fair value through profit or loss	$	18,490,569	$	17,138,461
Financial assets at fair value through other comprehensive income		15,189,600		17,683,960
Financial assets measured at amortized cost
Cash and cash equivalents (cash on hand excluded)		173,812,754		132,547,415
Receivables		38,783,086		32,292,914
Refundable deposits		2,749,691		2,708,823
Other financial assets		869,308		6,353,768
Total	$	249,895,008	$	208,725,341

	As of December 31,
Financial Liabilities	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial liabilities at fair value through profit or loss	$	438,397	$	1,019,362
Financial liabilities measured at amortized cost
Short-term loans		—		13,530,000
Payables		58,893,871		52,393,399
Guarantee deposits (current portion included)		30,757,001		41,599,386
Bonds payable (current portion included)		28,184,687		38,359,352
Long-term loans (current portion included)		19,279,342		22,883,344
Lease liabilities		5,737,095		5,393,187
Other financial liabilities		21,449,487		—
Total	$	164,739,880	$	175,178,030

(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.

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, 2021, 2022 and 2023 decreases/increases by NT$1,104 million, NT$1,305 million and NT$620 million, respectively. When RMB strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2021, 2022 and 2023 increases/decreases by NT$375 million and decreases/increases by NT$572 million, NT$582 million, respectively. When JPY strengthens/weakens against USD by 10%, the profit for the years ended December 31, 2021, 2022 and 2023 decreases/increases by NT$434 million, NT$538 million and NT$290 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), (13) and (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, 2021, 2022 and 2023 to decrease/increase by NT$39 million, NT$19 million and NT$36 million, respectively.

Equity price risk

The Company’s listed and unlisted equity securities, investments in convertible bonds 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, the investments in convertible bonds which contain the right of conversion to equity instruments are classified as financial assets at fair value through profit or loss, and the 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. Please refer to Note 6(2), (3) and (12) for the relevant information.

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, 2021, 2022 and 2023 by NT$393 million, NT$285 million and NT$270 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 (loss) for the years ended December 31, 2021, 2022 and 2023 by NT$867 million, NT$579 million and NT$722 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, 2022 and 2023, accounts receivable from the top ten customers represent 56% and 67% 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, 2022
	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
Payables	$	58,767,584	$	—	$	—	$	—	$	58,767,584
Guarantee deposits		238,416		3,867,087		169,419		26,482,079		30,757,001
Bonds payable (Note)		322,155		8,742,481		10,593,656		4,151,128		23,809,420
Long-term loans		3,246,153		8,425,744		7,798,280		3,031,293		22,501,470
Lease liabilities		658,092		1,222,822		1,207,385		4,299,914		7,388,213
Other financial liabilities		17,233,129		4,308,513		—		—		21,541,642
Total	$	80,465,529	$	26,566,647	$	19,768,740	$	37,964,414	$	164,765,330

	As of December 31, 2023
	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	$	13,780,612	$	—	$	—	$	—	$	13,780,612
Payables		52,202,821		—		—		—		52,202,821
Guarantee deposits		1,476,430		3,556,179		25,955,654		10,611,123		41,599,386
Bonds payable (Note)		14,797,772		10,980,506		12,321,345		2,132,963		40,232,586
Long-term loans		2,872,168		14,406,101		5,071,743		2,940,524		25,290,536
Lease liabilities		649,879		1,311,239		1,223,724		3,712,729		6,897,571
Total	$	85,779,682	$	30,254,025	$	44,572,466	$	19,397,339	$	180,003,512

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 were NT$3,213 million and NT$5,753 million as of December 31, 2022 and 2023, respectively. 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. As of December 31, 2022 and 2023, all of these contracts have been settled.

(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, 2022
	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	$	669,444	$	—	$	36,474	$	705,918
Financial assets at fair value through profit or loss, noncurrent		6,626,088		468,164		10,690,399		17,784,651
Financial assets at fair value through other comprehensive income, current		3,213,057		—		—		3,213,057
Financial assets at fair value through other comprehensive income, noncurrent		8,366,276		—		3,610,267		11,976,543
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		—		438,397		438,397

	As of December 31, 2023
	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	$	443,601	$	—	$	—	$	443,601
Financial assets at fair value through profit or loss, noncurrent		6,424,475		19,300		10,251,085		16,694,860
Financial assets at fair value through other comprehensive income, current		5,753,379		—		—		5,753,379
Financial assets at fair value through other comprehensive income, noncurrent		8,693,193		—		3,237,388		11,930,581
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		—		1,019,362		1,019,362

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 year ended December 31, 2022, there was no transfers between Level 1 and Level 2 fair value measurements. During the year ended December 31, 2023, as the private placement ordinary shares held by the Company’s subsidiary became publicly listed on the over-the-counter market in Taiwan in May 2023, the Company transferred NT$655 million of the financial assets at fair value through profit or loss measured at the end of the reporting period in the quarter from Level 2 to Level 1 fair value measurement.

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, 2022	$	3,584,326		$	2,580,246		$	3,464,652		$	234,936		$	9,864,160		$	2,351,603	$	151,859	$	2,503,462
Recognized in profit (loss)		(150,786	)		(328,602	)		519,572			(53,225	)		(13,041	)		—		—		—
Recognized in other comprehensive income (loss)		—			—			—			—			—			1,076,117		30,688		1,106,805
Acquisition		192,258			485,256			625,542			—			1,303,056			—		—		—
Disposal		(186,579	)		(15,782	)		(194,572	)		(149,850	)		(546,783	)		—		—		—
Return of capital		—			—			(26,672	)		—			(26,672	)		—		—		—
Transfer out of Level 3		(326,577	)		—			—			—			(326,577	)		—		—		—
Exchange effect		86,166			144,140			237,811			4,613			472,730			—		—		—
As of December 31, 2022	$	3,198,808		$	2,865,258		$	4,626,333		$	36,474		$	10,726,873		$	3,427,720	$	182,547	$	3,610,267

	Financial liabilities at fair value through profit or loss
	Derivatives
	NT$ (In Thousands)
As of January 1, 2022	$	2,380,599
Recognized in profit (loss)		(1,433,405	)
Derecognition		(508,797	)
As of December 31, 2022	$	438,397

	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			Others			Total			Common stock			Preferred stock			Total
	NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2023	$	3,198,808		$	2,865,258		$	4,626,333		$	36,474		$	—		$	10,726,873		$	3,427,720		$	182,547		$	3,610,267
Recognized in profit (loss)		(312,149	)		(277,994	)		(617,764	)		(8,828	)		—			(1,216,735	)		—			—			—
Recognized in other comprehensive income (loss)		—			—			—			—			—			—			(365,395	)		(7,484	)		(372,879	)
Acquisition		610,153			294,046			294,245			—			154,761			1,353,205			—			—			—
Disposal		—			(89,997	)		—			(27,740	)		—			(117,737	)		—			—			—
Return of capital		(1,384	)		—			(36,346	)		—			—			(37,730	)		—			—			—
Transfer out of Level 3		(461,403	)		—			—			—			—			(461,403	)		—			—			—
Exchange effect		2,230			(4,679	)		8,428			94			(1,461	)		4,612			—			—			—
As of December 31, 2023	$	3,036,255		$	2,786,634		$	4,274,896		$	—		$	153,300		$	10,251,085		$	3,062,325		$	175,063		$	3,237,388

	Financial liabilities at fair value through profit or loss
	Derivatives
	NT$ (In Thousands)
As of January 1, 2023	$	438,397
Recognized in profit (loss)		580,965
As of December 31, 2023	$	1,019,362

The total profit (loss) of NT$330 million, NT$(74) million and NT$(1,329) million for the years ended December 31, 2021, 2022 and 2023, 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 profit (loss) of NT$(360) million, NT$829 million and NT$(581) million for the years ended December 31, 2021, 2022 and 2023, 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, 2022
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, 2022 by NT$273 million and NT$198 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2022 by NT$248 million.
Embedded derivatives in exchangeable bonds	Binomial tree valuation model	Volatility	36.46%	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, 2022 by NT$77 million and NT$67 million, respectively.

As of December 31, 2023
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, 2023 by NT$261 million and NT$199 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2023 by NT$214 million.
Embedded derivatives in exchangeable bonds	Binomial tree valuation model	Volatility	27.70%	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, 2023 by NT$119 million and NT$131 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, exchange price, volatility, risk-free interest rates and risk discount 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 cash and cash equivalents, receivables, refundable deposits, other financial assets, short-term loans, payables and guarantee deposits approximate their carrying amount.

As of December 31, 2022
			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)	$	28,346,985	$	22,916,330	$	5,430,655	$	—	$	28,184,687
Long-term loans (current portion included)		19,279,342		—		19,279,342		—		19,279,342
As of December 31, 2023
			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)	$	38,367,168	$	32,827,211	$	5,539,957	$	—	$	38,359,352
Long-term loans (current portion included)		22,883,344		—		22,883,344		—		22,883,344

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Operating Segment Information

12 Months Ended

Dec. 31, 2023

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. 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,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Taiwan	$	130,812,383	$	158,066,796
Singapore		29,080,766		55,322,448
China (includes Hong Kong)		37,213,538		33,424,815
Japan		10,736,562		13,415,669
Others		20,638		76,508
Total	$	207,863,887	$	260,306,236

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, 2021, 2022 and 2023 were as follows:

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Customer A	$	21,935,208	$	24,061,849	$	16,615,745
Customer B	$	14,707,370	$	22,226,167	$	29,242,973

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Capital Management

12 Months Ended

Dec. 31, 2023

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, 2022 and 2023 were as follows:

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Total liabilities	$	201,834,635		$	202,859,864
Less: Cash and cash equivalents		(173,818,777	)		(132,553,615	)
Net debt		28,015,858			70,306,249
Total equity		322,810,948			343,716,968
Total capital	$	350,826,806		$	414,023,217
Debt to capital ratios		7.99%			16.98%

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Summary of Material Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Disclosure Of Summary Of Material 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, 2022 and 2023 were as follows:

			Percentage of ownership (%) As of December 31,
Investor	Subsidiary	Business nature	2022		2023
UMC	UMC GROUP (USA)	IC Sales		100.00		100.00
UMC	UNITED MICROELECTRONICS (EUROPE) B.V. (UME BV)	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. (UMC KOREA)	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. (USJC)	Sales and manufacturing of integrated circuits		100.00		100.00
UMC and FORTUNE	WAVETEK MICROELECTRONICS CORPORATION (WAVETEK)	Sales and manufacturing of integrated circuits		80.14		80.00
TLC	SOARING CAPITAL CORP.	Investment holding		100.00		100.00
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		99.01
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
WAVETEK	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		—		100.00
WAVETEK	WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA)	Investment holding		100.00		—
WAVETEK-SAMOA	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		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		71.86		100.00

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 “Financial Instruments” (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 NTD 30.62 on December 29, 2023 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.

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.

Inventories

(11) 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

(12) 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

(13) Property, Plant and Equipment

Property, plant and equipment are stated at cost, net of accumulated depreciation and accumulated impairment losses, if any. The cost of an item of property, plant and equipment comprises the acquisition cost, the costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management, and the initial estimate of costs for dismantling, removing the item and restoring the site on which it is located. 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 depreciation of the assets is calculated mainly over the following estimated useful lives: buildings - 20 to 56 years; machinery and equipment - 6 years; transportation equipment - 6 years; furniture and fixtures - 6 years; leasehold improvement - the shorter of lease terms or useful lives.

Lease

(14) 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

(15) 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 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

(16) 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

(17) Bonds

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

(18) 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

(19) 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.

Provision

(20) Provision

Provisions are recognized when the Company has a present obligation (legal or constructive) as a result of a past event, it is probable that an outflow of resources embodying economic benefits will be required to settle the obligation and a reliable estimate can be made of the amount of the obligation. Where the Company expects some or all of a provision to be reimbursed, the reimbursement is recognized as a separate asset when, and only when it is virtually certain that reimbursement will be received. If the effect of the time value of money is material, provisions are discounted using a current pre-tax rate that reflects current market assessments of the time value of money and the risks specific to the liability. Where discounting is used, the increase in the provision due to the passage of time is recognized as a finance cost.

Decommissioning Liabilities

The amount of the decommissioning liability, arising from dismantling, removing the items of property, plant and equipment and restoring the site on which they are located, are provided at the present value of expected costs to settle the obligation using estimated cash flows, while the decommissioning costs are recognized as part of the cost of the particular items. The discount rate shall be a pre-tax rate that reflects current market assessments of the time value of money and the risks specific to the decommissioning liability. The periodic unwinding of the discount shall be recognized in profit or loss as a finance cost as it occurs. The estimated future costs of decommissioning are reviewed at the end of each reporting period and adjusted as appropriate. Changes in the estimated future costs or in the discount rate applied are added to or deducted from the cost of the items of property, plant and equipment.

Onerous contracts

An onerous contract is a contract in which the unavoidable costs of meeting the obligations under the contract exceed the economic benefits expected to be received under it. The present obligation under the onerous contract shall be recognized and measured as a provision. The unavoidable costs under a contract reflect the least net cost of exiting from the contract, which is the lower of the cost of fulfilling it and any compensation or penalties arising from failure to fulfill it. The aforementioned cost of fulfilling a contract comprises the costs that relate directly to the contract, which includes the incremental costs of fulfilling that contract and the allocation of other costs that relate directly to fulfilling contracts.

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 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 that, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss and does not give rise to equal taxable and deductible temporary differences;

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 that, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss and does not give rise to equal taxable and deductible temporary differences;

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.

According to the temporary exception in the International Tax Reform – Pillar Two Model Rules (Amendments to IAS 12 “Income Taxes”), deferred tax assets and liabilities related to Pillar Two income tax will not be recognized nor disclosed.

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 number of shares outstanding is adjusted retroactively for stock dividends and employee stock compensation issues.

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Summary of Material Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Disclosure Of Summary Of Material Accounting Policies [Abstract]

Consolidated Entities

b. The consolidated entities as of December  31, 2022 and 2023 were as follows:

			Percentage of ownership (%) As of December 31,
Investor	Subsidiary	Business nature	2022		2023
UMC	UMC GROUP (USA)	IC Sales		100.00		100.00
UMC	UNITED MICROELECTRONICS (EUROPE) B.V. (UME BV)	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. (UMC KOREA)	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. (USJC)	Sales and manufacturing of integrated circuits		100.00		100.00
UMC and FORTUNE	WAVETEK MICROELECTRONICS CORPORATION (WAVETEK)	Sales and manufacturing of integrated circuits		80.14		80.00
TLC	SOARING CAPITAL CORP.	Investment holding		100.00		100.00
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		99.01
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
WAVETEK	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		—		100.00
WAVETEK	WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA)	Investment holding		100.00		—
WAVETEK-SAMOA	WAVETEK MICROELECTRONICS CORPORATION (USA)	Marketing service		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		71.86		100.00

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Contents of Significant Accounts (Tables)

12 Months Ended

Dec. 31, 2023

Contents Of Significant Accounts [Line Items]

Cash and Cash Equivalents

(1) Cash and Cash Equivalents

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Cash on hand and petty cash	$	6,023	$	6,200
Checking and savings accounts		42,422,443		50,322,942
Time deposits		125,467,386		80,276,114
Repurchase agreements collateralized by government bonds and corporate notes		5,922,925		1,948,359
Total	$	173,818,777	$	132,553,615

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	2022		2023
		NT$		NT$
		(In Thousands)		(In Thousands)
Common stock	SILICON INTEGRATED SYSTEMS CORP.	$	2,316,197	$	—
Common stock	UNIMICRON HOLDING LIMITED		2,847,385		2,514,120
Common stock	ITE TECH. INC.		1,023,266		2,100,977
Common stock	CHIPBOND TECHNOLOGY CORPORATION		3,051,603		3,843,744
Common stock	NOVATEK MICROELECTRONICS CORP. (NOVATEK)		5,188,267		8,501,851
Common stock	SHIN-ETSU HANDOTAI TAIWAN CO., LTD.		580,335		548,205
Preferred stock	MTIC HOLDINGS PTE. LTD.		182,547		175,063

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 were listed below:

	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Held at end of period	$	1,431,931	$	1,052,336
Derecognized during the period		—		142,535
Total	$	1,431,931	$	1,194,871

Summary of Details on Derecognition of Such Investments

c. The Company reclassified its equity instrument investment in SIS as investments accounted for under the equity method. Details on derecognition of such investments are as follow:

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Fair value on the date of disposal	$	—	$	—	$	3,035,999
Cumulative gains (losses) reclassified to retained earnings due to derecognition	$	—	$	—	$	(1,628,388	)

Aging Analysis of Accounts Receivable

Aging analysis of accounts receivable:
	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Neither past due	$	30,545,437	$	25,707,008
Past due:
≤ 30 days		5,303,765		3,008,126
31 to 60 days		130,408		78,668
61 to 90 days		3,247		5,599
91 to 120 days		7,886		—
≥ 121 days		662,868		517,211
Subtotal		6,108,174		3,609,604
Total	$	36,653,611	$	29,316,612

Movement of Loss Allowance

Movement of loss allowance for accounts receivable:
	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Beginning balance	$	194,491	$	209,101
Net recognition (reversal) for the period		14,610		(130,039	)
Ending balance	$	209,101	$	79,062

Inventories, Net

(6) Inventories, Net

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Raw materials	$	6,335,428	$	10,995,569
Supplies and spare parts		7,161,216		6,443,172
Work in process		14,897,926		15,560,517
Finished goods		2,675,390		2,713,300
Total	$	31,069,960	$	35,712,558

Details of Investments Accounted for Under the Equity Method

(7) Investments Accounted for Under the Equity Method

a. Details of investments accounted for under the equity method are as follows:

	As of December 31,
	2022				2023
Investee companies	Amount		Percentage of ownership or voting rights		Amount		Percentage of ownership or voting rights
	NT$				NT$
	(In Thousands)				(In Thousands)
Listed companies
SILICON INTEGRATED SYSTEMS CORP. (SIS) (Note A)	$	—		—	$	2,373,060		19.02
FARADAY TECHNOLOGY CORP. (FARADAY) (Note B)		1,862,245		13.78		1,990,073		13.78
UNIMICRON TECHNOLOGY CORP. (UNIMICRON) (Note C)		13,285,169		13.27		13,644,560		13.05
Unlisted companies
MTIC HOLDINGS PTE. LTD. (Note D)		—		45.44		—		45.44
UNITECH CAPITAL INC.		426,070		42.00		625,667		42.00
TRIKNIGHT CAPITAL CORPORATION (TRIKNIGHT) (Note E)		2,117,678		40.00		2,109,906		40.00
HSUN CHIEH CAPITAL CORP.		210,690		40.00		235,098		40.00
PURIUMFIL INC.		14,622		40.00		11,474		40.00
HSUN CHIEH INVESTMENT CO., LTD. (HSUN CHIEH) (Note F)		2,980,984		36.49		4,126,878		36.49
YANN YUAN INVESTMENT CO., LTD. (YANN YUAN)		5,455,743		26.78		7,516,327		26.78
UNITED LED CORPORATION HONG KONG LIMITED		97,156		25.14		93,793		25.14
VSENSE CO., LTD. (Note D)		—		23.98		—		23.98
TRANSLINK CAPITAL PARTNERS I, L.P. (Note G)		54,556		10.38		58,964		10.38
Total	$	26,504,913			$	32,785,800

Note A: In August 2023, the board chairman of SIS changed and became the same person as the board chairman of UMC. After considering the comprehensive conditions, including ownership interest held and representation on Board of Directors of SIS, etc., the Company determines that it has significant influence over SIS and accounts for its investment in SIS as an associate. SIS was previously measured at fair value through other comprehensive income and reclassified as investments accounted for under the equity method. UMC’s share of the net fair value of SIS’s identifiable assets and liabilities was in excess of the fair value of the previously held investment in SIS at the acquisition date, and the difference was recognized as bargain purchase gain. Cumulative fair value change that was previously recognized in other comprehensive loss up to reclassification date was reclassified to retained earnings in the current period.

Note B: Beginning from June 2015, the Company accounts for its investment in FARADAY as an associate given the fact that UMC obtained the ability to exercise significant influence over FARADAY through representation on its Board of Directors.

Note C: Beginning from June 2020, the Company accounts for its investment in UNIMICRON as an associate given the fact that UMC obtained the ability to exercise significant influence over UNIMICRON through representation on its Board of Directors. On January 6, 2023, UNIMICRON issued new shares to merge with SUBTRON TECHNOLOGY CO., LTD. (SUBTRON) through share conversion. The share conversion ratio was 1 common share of SUBTRON to exchange 0.219 common shares of UNIMICRON. The 23 million shares of SUBTRON held by the Company were exchanged to 5 million common shares newly issued by UNIMICRON.

Note D: 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 E: TRIKNIGHT executed a capital reduction and refunded NT$400 million and NT$560 million based on UMC’s stockholding percentage in June and December 2023, respectively. UMC’s stockholding percentage remains unchanged.

Note F: HSUN CHIEH executed a capital reduction and refunded NT$343 million based on UMC’s stockholding percentage in April 2023. UMC’s stockholding percentage remains unchanged.

Note G: The Company follows international accounting practices in equity accounting for limited partnerships and uses the equity method to account for these investees.

Property, Plant and Equipment

(8) Property, Plant and Equipment

a. 2022

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, 2022	$	1,491,343		$	36,827,480		$	897,806,699		$	55,959	$	7,305,174		$	61,282		$	22,856,033		$	966,403,970
Additions		—			325,943			—			—		—			—			72,270,938			72,596,881
Disposals		—			(69,897	)		(6,391,003	)		—		(27,782	)		(2,414	)		(69,640	)		(6,560,736	)
Transfers and reclassifications		—			219,666			46,548,734			8,154		730,317			421			(39,772,778	)		7,734,514
Exchange effect		(21,127	)		294,577			15,855,258			810		54,284			3,786			79,390			16,266,978
As of December 31, 2022	$	1,470,216		$	37,597,769		$	953,819,688		$	64,923	$	8,061,993		$	63,075		$	55,363,943		$	1,056,441,607
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, 2022	$	—		$	21,184,969		$	810,904,881		$	47,108	$	6,222,383		$	55,125		$	—		$	838,414,466
Depreciation		—			1,443,545			38,565,229			3,946		456,017			2,816			—			40,471,553
Disposals		—			(69,489	)		(6,331,532	)		—		(27,421	)		(2,404	)		—			(6,430,846	)
Transfers and reclassifications		—			161			(4,913	)		—		(176	)		—			—			(4,928	)
Exchange effect		—			172,320			14,604,120			543		46,714			3,846			—			14,827,543
As of December 31, 2022	$	—		$	22,731,506		$	857,737,785		$	51,597	$	6,697,517		$	59,383		$	—		$	887,277,788
Net carrying amount:
As of December 31, 2022	$	1,470,216		$	14,866,263		$	96,081,903		$	13,326	$	1,364,476		$	3,692		$	55,363,943		$	169,163,819

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, 2022	$	549,010		$	2,422,389		$	—	$	1,312,703		$	4,284,102
Disposals		—			—			—		(660	)		(660	)
Transfers and reclassifications		—			(1,226	)		6,345		15,562			20,681
Exchange effect		(3,223	)		22,084			—		6,686			25,547
As of December 31, 2022	$	545,787		$	2,443,247		$	6,345	$	1,334,291		$	4,329,670
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, 2022	$	—		$	1,095,113		$	—	$	1,236,790		$	2,331,903
Depreciation		—			94,644			—		60,229			154,873
Disposals		—			—			—		(660	)		(660	)
Transfers and reclassifications		—			(161	)		6,345		211			6,395
Exchange effect		—			13,216			—		5,696			18,912
As of December 31, 2022	$	—		$	1,202,812		$	6,345	$	1,302,266		$	2,511,423
Net carrying amount:
As of December 31, 2022	$	545,787		$	1,240,435		$	—	$	32,025		$	1,818,247

b. 2023

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, 2023	$	1,470,216		$	37,597,769		$	953,819,688		$	64,923		$	8,061,993		$	63,075		$	55,363,943		$	1,056,441,607
Additions		—			223,177			—			—			—			—			82,213,765			82,436,942
Disposals		—			(12,160	)		(6,475,636	)		—			(112,396	)		—			(33,581	)		(6,633,773	)
Transfers and reclassifications		—			902,122			77,170,979			7,104			953,582			3,379			(54,194,544	)		24,842,622
Exchange effect		(39,878	)		(341,045	)		(3,016,210	)		(315	)		(29,711	)		(631	)		(990,932	)		(4,418,722	)
As of December 31, 2023	$	1,430,338		$	38,369,863		$	1,021,498,821		$	71,712		$	8,873,468		$	65,823		$	82,358,651		$	1,152,668,676
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, 2023	$	—		$	22,731,506		$	857,737,785		$	51,597		$	6,697,517		$	59,383		$	—		$	887,277,788
Depreciation		—			1,416,727			35,031,869			4,924			490,468			4,149			—			36,948,137
Disposals		—			(12,160	)		(6,468,067	)		—			(112,330	)		—			—			(6,592,557	)
Exchange effect		—			(107,933	)		(2,212,913	)		(264	)		(19,642	)		(494	)		—			(2,341,246	)
As of December 31, 2023	$	—		$	24,028,140		$	884,088,674		$	56,257		$	7,056,013		$	63,038		$	—		$	915,292,122
Net carrying amount:
As of December 31, 2023	$	1,430,338		$	14,341,723		$	137,410,147		$	15,455		$	1,817,455		$	2,785		$	82,358,651		$	237,376,554

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, 2023	$	545,787		$	2,443,247		$	6,345	$	1,334,291		$	4,329,670
Transfers and reclassifications		—			—			—		54,469			54,469
Exchange effect		(6,084	)		(2,330	)		—		(3,020	)		(11,434	)
As of December 31, 2023	$	539,703		$	2,440,917		$	6,345	$	1,385,740		$	4,372,705

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, 2023	$	—	$	1,202,812		$	6,345	$	1,302,266		$	2,511,423
Depreciation		—		94,944			—		23,395			118,339
Exchange effect		—		(688	)		—		(3,063	)		(3,751	)
As of December 31, 2023	$	—	$	1,297,068		$	6,345	$	1,322,598		$	2,626,011
Net carrying amount:
As of December 31, 2023	$	539,703	$	1,143,849		$	—	$	63,142		$	1,746,694

Summary of Interest Expense Capitalized

c. Details of interest expense capitalized were as follows:

	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Interest expense capitalized	$	1,661	$	9,355
Interest rates applied		1.44% - 1.61%		1.48% - 1.65%

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,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Land (including land use right)	$	5,714,166	$	5,318,986
Buildings		124,420		156,483
Machinery and equipment		1,748,244		1,506,824
Transportation equipment		21,485		16,356
Other equipment		3,676		1,706
Net	$	7,611,991	$	7,000,355
	For the years ended December 31,
	2022		2023
	NT$		NT$
Depreciation	(In Thousands)		(In Thousands)
Land (including land use right)	$	359,007	$	377,593
Buildings		119,641		93,610
Machinery and equipment		206,445		203,606
Transportation equipment		12,287		13,267
Other equipment		4,568		3,004
Total	$	701,948	$	691,080

i. For the years ended December 31, 2022 and 2023, the Company’s addition to right-of-use assets amounted to NT$1,130 million and NT$206 million, respectively.

ii. Please refer to Note 8 for right-of-use assets pledged as collateral.

(b) Lease Liabilities

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Current	$	537,314	$	514,324
Non-current		5,199,781		4,878,863
Total	$	5,737,095	$	5,393,187

Please refer to Note 6(24) for the interest expenses on the lease liabilities.

Intangible Assets

(10) Intangible Assets

2022

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, 2022	$	15,012	$	4,845,037		$	4,491,164		$	3,348,071		$	12,699,284
Additions		—		2,713,534			—			480,880			3,194,414
Write-off		—		(1,857,289	)		(1,344,682	)		(869,940	)		(4,071,911	)
Reclassifications		—		(10,721	)		—			—			(10,721	)
Exchange effect		—		(20,774	)		275,950			(5,027	)		250,149
As of December 31, 2022	$	15,012	$	5,669,787		$	3,422,432		$	2,953,984		$	12,061,215

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, 2022	$	7,398	$	2,913,824		$	3,324,667		$	2,808,462		$	9,054,351
Amortization		—		1,656,765			475,870			556,965			2,689,600
Write-off		—		(1,857,289	)		(1,344,682	)		(869,940	)		(4,071,911	)
Exchange effect		—		(23,903	)		141,658			(3,780	)		113,975
As of December 31, 2022	$	7,398	$	2,689,397		$	2,597,513		$	2,491,707		$	7,786,015
Net carrying amount:
As of December 31, 2022	$	7,614	$	2,980,390		$	824,919		$	462,277		$	4,275,200

2023

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, 2023	$	15,012	$	5,669,787		$	3,422,432		$	2,953,984		$	12,061,215
Additions		—		1,399,699			346,896			999,510			2,746,105
Write-off		—		(1,498,642	)		(1,826,383	)		(632,860	)		(3,957,885	)
Reclassifications		—		(5,855	)		—			—			(5,855	)
Exchange effect		—		(98,912	)		(169,404	)		(9,993	)		(278,309	)
As of December 31, 2023	$	15,012	$	5,466,077		$	1,773,541		$	3,310,641		$	10,565,271

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, 2023	$	7,398	$	2,689,397		$	2,597,513		$	2,491,707		$	7,786,015
Amortization		—		1,741,898			277,768			535,944			2,555,610
Write-off		—		(1,498,642	)		(1,826,383	)		(632,860	)		(3,957,885	)
Exchange effect		—		(41,822	)		(139,933	)		(9,269	)		(191,024	)
As of December 31, 2023	$	7,398	$	2,890,831		$	908,965		$	2,385,522		$	6,192,716
Net carrying amount:
As of December 31, 2023	$	7,614	$	2,575,246		$	864,576		$	925,119		$	4,372,555

Amortization Amounts of Intangible Assets

The amortization amounts of intangible assets were as follows:

	For the years ended December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Operating costs	$	1,329,850	$	1,144,960
Operating expenses	$	1,359,750	$	1,410,650

Details of Loans

(11) Short-Term Loans

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Unsecured bank loans	$	—	$	13,530,000
	As of December 31,
	2022		2023
Interest rates applied		—		1.69% - 2.65%

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,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Embedded derivatives in exchangeable bonds	$	438,397		$	1,019,362

Bonds Payable

(13) Bonds Payable

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured domestic bonds payable	$	23,100,000		$	33,100,000
Unsecured exchangeable bonds payable		5,757,373			5,757,373
Less: Discounts on bonds payable		(672,686	)		(498,021	)
Total		28,184,687			38,359,352
Less: Current or exchangeable portion due within one year		(5,101,591	)		(13,779,701	)
Net	$	23,083,096		$	24,579,651

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
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 was paid annually and the principal was fully repaid in March 2022.
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 was paid annually and the principal was fully repaid in October 2022.
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.
Five-year (Green bond)	In mid-September 2023	NT$10,000 million		1.62%	Interest will be paid annually and the principal will be repayable in September 2028 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,
	2022			2023
	NT$ (In Thousands)			NT$ (In Thousands)
Present value of the defined benefit obligation	$	(5,106,623	)	$	(4,665,498	)
Fair value of plan assets		2,237,221			2,460,413
Funded status		(2,869,402	)		(2,205,085	)
Net defined benefit liabilities, noncurrent recognized on the consolidated balance sheets	$	(2,869,402	)	$	(2,205,085	)

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,
	2022			2023
Cash		20	%		21	%
Equity instruments		47	%		46	%
Debt instruments		22	%		23	%
Others		11	%		10	%

Principal Underlying Actuarial Assumptions

v. The principal underlying actuarial assumptions are as follows:

	As of December 31,
	2022			2023
Discount rate		1.24	%		1.20	%
Rate of future salary increase		4.25	%		3.50	%

Expected Future Benefit Payments

vi. Expected future benefit payments are as follows:

Year	As of December 31, 2023
	NT$ (In Thousands)
2024	$	596,934
2025		529,837
2026		486,833
2027		465,919
2028		434,293
2029 and thereafter		2,511,716
Total	$	5,025,532

Sensitivity Analysis

vii. Sensitivity analysis:

	As of December 31, 2022
	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	$	172,801	$	(182,478	)	$	(151,050	)	$	145,000

	As of December 31, 2023
	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	$	137,615	$	(144,683	)	$	(117,784	)	$	113,478

Deferred Government Grants

(16) Deferred Government Grants

	As of December 31,
	2022			2023
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance	$	8,543,798		$	4,677,444
Arising during the period		174,352			591,086
Recorded in profit or loss:
Other operating income		(4,164,189	)		(2,663,843	)
Exchange effect		123,483			(57,665	)
Ending balance	$	4,677,444		$	2,547,022
Current (classified under other current liabilities)	$	2,681,842		$	717,457
Non-current (classified under other noncurrent liabilities)		1,995,602			1,829,565
Total	$	4,677,444		$	2,547,022

Summary of Refund Liabilities (classified under other current liabilities)

(17) Refund Liabilities (classified under other current liabilities)

	As of December 31,
	2022		2023
	NT$ (In Thousands)		NT$ (In Thousands)
Refund liabilities	$	1,139,227	$	3,033,576

Summary of Provisions

(18)  Provisions

	As of December 31,
	2022		2023
	NT$ (In Thousands)		NT$ (In Thousands)
Onerous Contracts (classified under other current liabilities)	$	469,779	$	57,800
Decommissioning Liabilities (classified under other noncurrent liabilities)		366,863		602,433
Total	$	836,642	$	660,233

Summary of Information about Provisions of Liabilities

	Onerous Contracts			Decommissioning Liabilities
	NT$ (In Thousands)			NT$ (In Thousands)
Balance as of January 1, 2023	$	469,779		$	366,863
Arising during the period		40,154			191,360
Unused provision reversed		(450,968	)		—
Discount rate adjustment and unwinding of discount from the passage of time		—			47,880
Exchange effect		(1,165	)		(3,670	)
Balance as of December 31, 2023	$	57,800		$	602,433

Summary of Stock Held by Associates

b. Details of UMC’s stock (thousand shares) held by the Company’s associates are as follows:

	As of December 31,
	2022		2023
HSUN CHIEH		441,371		441,371
YANN YUAN		192,963		192,963
SUBTRON, the subsidiary of UNIMICRON (Note A)		—		47
SIS (Note B)		—		266,580
Total		634,334		900,961

Details of Distribution

The details of appropriation were as follows:

	Appropriation of earnings (in thousand NT dollars)						Cash dividend per share (NT dollars)
	2022			2023			2022		2023
Legal reserve	$	8,905,139		$	6,255,736
Special reserve		(2,180,156	)		(2,734,057	)
Cash dividends		45,017,096			37,587,102		$	3.60	$	3.00

Non-controlling Interests

d. Non-controlling interests:

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Balance as of January 1	$	113,356		$	223,181		$	343,679
Impact of retroactive applications		—			(66,089	)		—
Adjusted balance as of January 1		113,356			157,092			343,679
Attributable to non-controlling interests:
Net income (loss)		(668,245	)		819,960			450,184
Other comprehensive income (loss)		(19	)		8			(14	)
Share-based payment transactions		—			1,490			5,817
Changes in subsidiaries’ ownership		(11,126	)		(1,339	)		456
Non-controlling interests		23,430			5,456			4,187
Derecognition of the non-controlling interests		765,785			(638,988	)		(463,450	)
Ending balance	$	223,181		$	343,679		$	340,859

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 initially by using Black-Scholes Option Pricing Model and will be remeasured at the end of each reporting period until settlement. As of December 31, 2023, the assumptions used are as follows:

	Granted in September 2020		Granted in June 2021
Share price of measurement date (NT$/ per share)	$	52.60	$	52.60
Expected volatility		23.95%		23.21% - 28.72%
Expected life		0.67 years		0.44 - 1.44 years
Expected dividend yield		6.02%		6.02%
Risk-free interest rate		1.06%		1.06% - 1.08%

Summary of Disaggregation of Revenue by Product

(21) Operating Revenues

a. Disaggregation of revenue

i. By product

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Wafer	$	204,594,399	$	265,600,173	$	211,750,622
Others		8,416,619		13,105,091		10,782,378
Total	$	213,011,018	$	278,705,264	$	222,533,000

Summary of Disaggregation of Revenue by Geography

ii. By geography

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Taiwan	$	92,427,670		$	105,213,451		$	68,360,231
China (includes Hong Kong)		26,949,205			39,641,613			27,545,452
Japan		13,445,127			17,053,279			11,612,866
Korea		17,548,763			25,689,385			30,872,198
USA		46,914,605			67,352,671			59,103,051
Europe		15,708,303			23,711,284			24,932,099
Others		17,345			43,581			107,103
Total	$	213,011,018		$	278,705,264		$	222,533,000

Summary of Disaggregation of Revenue by the Timing of Revenue Recognition

iii. By the timing of revenue recognition

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
At a point in time	$	211,074,982		$	276,175,120		$	220,283,306
Over time		1,936,036			2,530,144			2,249,694
Total	$	213,011,018		$	278,705,264		$	222,533,000

Summary of Balances of Contract Assets and Contract Liabilities

b. Contract balances

i. Contract assets, current

	As of January 1,			As of December 31,
	2022			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Sales of goods and services	$	677,326		$	766,691		$	1,132,477
Less: Loss allowance		(357,705	)		(393,373	)		(392,949	)
Net	$	319,621		$	373,318		$	739,528

ii. Contract liabilities

	As of January 1,		As of December 31,
	2022		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Sales of goods and services	$	4,083,140	$	3,985,003	$	3,681,352
Current	$	3,441,754	$	3,546,815	$	3,250,712
Non-current		641,386		438,188		430,640
Total	$	4,083,140	$	3,985,003	$	3,681,352

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.

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,
	2021						2022						2023
	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	$	23,388,888	$	11,806,207	$	35,195,095	$	30,074,528	$	13,928,646	$	44,003,174	$	26,693,905	$	12,002,205	$	38,696,110
Labor and health insurance		1,183,315		458,179		1,641,494		1,368,803		471,788		1,840,591		1,502,553		557,543		2,060,096
Pension		1,259,044		399,879		1,658,923		1,489,076		424,752		1,913,828		1,240,577		460,079		1,700,656
Other employee benefit expenses		335,829		144,668		480,497		373,739		165,114		538,853		421,871		196,739		618,610
Depreciation		42,002,745		1,908,719		43,911,464		39,305,321		1,756,609		41,061,930		36,006,021		1,545,067		37,551,088
Amortization		834,384		2,060,558		2,894,942		1,470,912		1,370,422		2,841,334		1,277,920		1,448,561		2,726,481

Details of Distribution of Employees' Compensation and Directors' Compensation

The details of distribution were as follows:

	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Employees’ compensation – Cash	$	4,770,909	$	9,160,485	$	5,439,059
Directors’ compensation		25,264		45,000		45,000

Net Other Operating Income and Expenses

(23) Net Other Operating Income and Expenses

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Government grants	$	5,269,412		$	5,058,658		$	3,862,001
Rental income from property, plant and equipment		187,166			192,833			202,082
Gain on disposal of property, plant and equipment		143,735			482,983			268,293
Others		(373,482	)		(394,827	)		(330,050	)
Total	$	5,226,831		$	5,339,647		$	4,002,326

Non-Operating Income and Expenses

(24) Non-Operating Income and Expenses

a. Other gains and losses

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Gain (Loss) on valuation of financial assets and liabilities at fair value through profit or loss	$	2,892,470		$	(1,247,962	)	$	(40,553	)
Gain (Loss) on disposal of investments accounted for under the equity method		(16,388	)		50,553			163,395
Others		(2,009,952	)		62,869			100,254
Total	$	866,130		$	(1,134,540	)	$	223,096

b. Finance costs

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Interest expenses
Bonds payable	$	437,055	$	486,079	$	444,424
Bank loans		1,285,708		1,100,840		833,548
Lease liabilities		145,187		166,928		179,367
Others		139		31,464		16,390
Financial expenses		94,841		81,018		96,645
Total	$	1,962,930	$	1,866,329	$	1,570,374

Components of Other Comprehensive Income (Loss)

(25) Components of Other Comprehensive Income (Loss)

	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

	For the year ended December 31, 2022
	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	$	296,804		$	—	$	296,804		$	(59,361	)	$	237,443
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		(4,646,064	)		—		(4,646,064	)		(71,121	)		(4,717,185	)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		(1,694,965	)		—		(1,694,965	)		123,483			(1,571,482	)
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		9,292,308			—		9,292,308			883,238			10,175,546
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		91,442			—		91,442			(23,672	)		67,770
Total other comprehensive income (loss)	$	3,339,525		$	—	$	3,339,525		$	852,567		$	4,192,092

	For the year ended December 31, 2023
	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	$	402,234		$	—		$	402,234		$	(80,447	)	$	321,787
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		5,530,359			—			5,530,359			(243,057	)		5,287,302
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		1,610,116			—			1,610,116			(90,891	)		1,519,225
Items that may be reclassified subsequently to profit or loss:
Exchange differences on translation of foreign operations		(2,386,278	)		—			(2,386,278	)		386,660			(1,999,618	)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		(73,005	)		(1,413	)		(74,418	)		3,768			(70,650	)
Total other comprehensive income (loss)	$	5,083,426		$	(1,413	)	$	5,082,013		$	(23,967	)	$	5,058,046

Major Components of Income Tax Expense

(26) Income Tax

a. The major components of income tax expense (benefit) for the years ended December 31, 2021, 2022 and 2023 were as follows:

i. Income tax expense (benefit) recorded in profit or loss

	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Current income tax expense (benefit):
Current income tax charge	$	7,088,975		$	17,582,039		$	6,426,598
Adjustments in respect of current income tax of prior periods		(150,260	)		(585,941	)		(217,891	)
Deferred income tax expense (benefit):
Deferred income tax related to origination and reversal of temporary differences		407,280			2,276,015			2,239,309
Deferred income tax related to recognition and derecognition of tax losses and unused tax credits		723,270			60,178			—
Adjustment of prior year’s deferred income tax		(130,841	)		8,611			(120,230	)
Deferred income tax arising from write-down or reversal of write-down of deferred tax assets		(20,172	)		(14,007	)		(16,516	)
Income tax expense recorded in profit or loss	$	7,918,252		$	19,326,895		$	8,311,270

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,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Remeasurements of defined benefit pension plans	$	39,495		$	(59,361	)	$	(80,447	)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income		(360,061	)		(71,121	)		(243,057	)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss		(96,510	)		123,483			(90,891	)
Income tax related to items that will not be reclassified subsequently to profit or loss	$	(417,076	)	$	(6,999	)	$	(414,395	)

(ii)  Items that may be reclassified subsequently to profit or loss:
	For the years ended December 31,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Exchange differences on translation of foreign operations	$	23,175		$	883,238		$	386,660
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss		6,763			(23,672	)		3,768
Income tax related to items that may be reclassified subsequently to profit or loss	$	29,938		$	859,566		$	390,428
iii.   Income tax charged directly to equity
	For the years ended December 31,
	2021			2022			2023
	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):
Adjustments of changes in net assets of associates and joint ventures accounted for using equity method		22			(2,720	)		(1,117	)
Income tax charged directly to equity	$	(181	)	$	(2,720	)	$	(1,117	)

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,
	2021			2022			2023
	NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)
Income before tax	$	58,496,432		$	109,625,660		$	68,450,404
At UMC’s statutory income tax rate		11,699,286			21,925,132			13,690,081
Adjustments in respect of current income tax of prior periods		(150,260	)		(585,941	)		(217,891	)
Net changes in loss carry-forward and investment tax credits		(845,267	)		(465,152	)		(2,179,234	)
Adjustment of deferred tax assets/liabilities for write-downs/reversals and different jurisdictional tax rates		183,123			(281,319	)		211,639
Tax effect of non-taxable income and non-deductible expenses:
Tax exempt income		(3,258,695	)		(4,384,566	)		(1,428,035	)
Investment loss (gain)		(1,388,877	)		1,827,822			(755,800	)
Dividend income		(171,725	)		(423,027	)		(323,182	)
Others		6,463			(340,745	)		(145,520	)
Basic tax		—			—			43,506
Estimated income tax on unappropriated earnings		1,558,031			1,247,910			(1,160,324	)
Effect of different tax rates applicable to UMC and its subsidiaries		116,174			605,929			234,510
Taxes withheld in other jurisdictions		43,443			35,979			38,346
Others		126,556			164,873			303,174
Income tax expense recorded in profit or loss	$	7,918,252		$	19,326,895		$	8,311,270

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,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Deferred income tax assets
Depreciation	$	2,056,568		$	2,396,554
Pension		569,193			436,129
Refund liabilities		138,617			306,408
Allowance for inventory valuation losses		507,621			682,909
Investment loss		474,405			314,427
Unrealized profit on intercompany sales		906,793			689,124
Others		573,039			304,860
Total deferred income tax assets		5,226,236			5,130,411
Deferred income tax liabilities
Depreciation		(70,133	)		(2,085,916	)
Investment gain		(2,648,989	)		(2,888,534	)
Amortizable assets		(298,451	)		(283,405	)
Others		(544,863	)		(374,109	)
Total deferred income tax liabilities		(3,562,436	)		(5,631,964	)
Net deferred income tax assets (liabilities)	$	1,663,800		$	(501,553	)

Movement of Deferred Tax

d. Movement of deferred tax

	For the years ended December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Balance as of January 1	$	3,154,352		$	1,663,800
Amounts recognized in profit or loss during the period		(2,330,797	)		(2,102,563	)
Amounts recognized in other comprehensive income (loss)		852,567			(23,967	)
Amounts recognized in equity		(2,720	)		(1,117	)
Exchange adjustments		(9,602	)		(37,706	)
Balance as of December 31	$	1,663,800		$	(501,553	)

Earnings Per Share

(27) Earnings Per Share

a. Earnings per share-basic

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	51,246,425	$	89,478,805	$	59,688,950
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)		12,005,126		12,095,312		12,137,954
Earnings per share-basic (NTD)	$	4.27	$	7.40	$	4.92

b. Earnings per share-diluted

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Net income attributable to the parent company	$	51,246,425	$	89,478,805	$	59,688,950
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)		12,005,126		12,095,312		12,137,954
Effect of dilution
Restricted stocks for employees		159,478		156,098		114,974
Employees’ compensation		80,243		238,242		129,196
Weighted-average number of ordinary shares after dilution (thousand shares)		12,244,847		12,489,652		12,382,124
Earnings per share-diluted (NTD)	$	4.19	$	7.16	$	4.82

Reconciliation of Liabilities Arising from Financing Activities

(28) Reconciliation of Liabilities Arising from Financing Activities

For the year ended December 31, 2021

						Non-cash changes
Items	As of January 1, 2021		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 B	)  )		40,536,658
Guarantee deposits (current portion included)		235,992		14,219,408			(85,631	)		—			14,369,769 (Note C	)
Lease liabilities		5,576,864		(699,680	)		(144,419	)		335,989			5,068,754
Other financial liabilities (Note D)		20,746,624		—			(163,387	)		382,972			20,966,209

For the year ended December 31, 2022

						Non-cash changes
Items	As of January 1, 2022		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2022
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	1,924,124	$	(1,965,684	)	$	41,560		$	—		$	—
Long-term loans (current portion included)		36,624,907		(18,816,259	)		1,470,694			—			19,279,342
Bonds payable (current portion included)		40,536,658		(13,305,050	)		—			953,079 (Note B	)		28,184,687
Guarantee deposits (current portion included)		14,369,769		14,984,941			1,402,291			—			30,757,001 (Note C	)
Lease liabilities		5,068,754		(712,854	)		153,406			1,227,789 (Note E	)		5,737,095
Other financial liabilities (Note D)		20,966,209		—			306,902			176,376			21,449,487

For the year ended December 31, 2023

						Non-cash changes
Items	As of January 1, 2023		Cash Flows			Foreign exchange			Others (Note A)			As of December 31, 2023
	NT$		NT$			NT$			NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
Short-term loans	$	—	$	13,530,000		$	—		$	—		$	13,530,000
Long-term loans (current portion included)		19,279,342		3,857,704			(253,702	)		—			22,883,344
Bonds payable (current portion included)		28,184,687		9,989,245			—			185,420 (Note B	)		38,359,352
Guarantee deposits (current portion included)		30,757,001		10,423,345			419,040			—			41,599,386 (Note C	)
Lease liabilities		5,737,095		(666,439	)		(24,106	)		346,637			5,393,187
Other financial liabilities (Note D)		21,449,487		(21,209,443	)		(330,783	)		90,739			—

Note A: Other non-cash changes mainly consisted of discount amortization measured by the effective interest method.

Note B: Please refer to Note 6(13) for the Company’s exchangeable bonds.

Note C: Guarantee deposits mainly consisted of deposits of capacity reservation.

Note D: Please refer to Note 9(6) for more details on other financial liabilities.

Note E: Mainly due to the increase in land lease.

Unused tax losses [member]

Contents Of Significant Accounts [Line Items]

Unused Tax Credits and Losses

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Expiry period
1-5 years	$	35,263,925	$	15,395,514
6-10 years		1,995,256		22,128,180
Total	$	37,259,181	$	37,523,694

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,
	2022			2023
	NT$ (In Thousands)			NT$ (In Thousands)
Beginning balance of fair value of plan assets	$	1,581,012		$	2,237,221
Items recognized as profit or loss:
Interest income on plan assets		9,802			27,742
Contribution by employer		745,066			307,556
Benefits paid		(224,632	)		(121,305	)
Remeasurements recognized in other comprehensive income (loss):
Return on plan assets, excluding amounts included in interest income		125,973			9,199
Fair value of plan assets at end of year	$	2,237,221		$	2,460,413

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,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Defined benefit obligation at beginning of year	$	(5,458,333	)	$	(5,106,623	)
Items recognized as profit or loss:
Service cost		(9,911	)		(9,893	)
Interest cost		(33,842	)		(63,322	)
Subtotal		(43,753	)		(73,215	)
Remeasurements recognized in other comprehensive income (loss):
Arising from changes in financial assumptions		227,790			166,401
Experience adjustments		(56,959	)		226,634
Subtotal		170,831			393,035
Benefits paid		224,632			121,305
Defined benefit obligation at end of year	$	(5,106,623	)	$	(4,665,498	)

More than 1 year [member]

Contents Of Significant Accounts [Line Items]

Details of Loans

(14) Long-Term Loans

a. Details of long-term loans as of December 31, 2022 and 2023 were as follows:

	As of December 31,
Lenders	2022		2023		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Long-Term Loan from Mega International Commercial Bank (1)	$	9,732	$	4,866	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)		18,000		13,765	Repayable quarterly from February 23, 2022 to February 22, 2027 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Mega International Commercial Bank (3)		60,500		46,265	Repayable quarterly from December 22, 2022 to February 23, 2027 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Taiwan Cooperative Bank (1)		35,676		23,784	Repayable quarterly from October 19, 2015 to October 19, 2025 with monthly interest payments. Interest-only payment for the first year.

	As of December 31,
Lenders	2022		2023		Redemption
	NT$		NT$
	(In Thousands)		(In Thousands)
Secured Long-Term Loan from Taiwan Cooperative Bank (2)		4,375		—	Repayable monthly from May 31, 2019 to May 31, 2023 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (3)		32,000		20,000	Repayable monthly from August 13, 2020 to August 13, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (4)		16,552		10,345	Repayable monthly from October 29, 2020 to August 29, 2025 with monthly interest payments.
Secured Long-Term Loan from Taiwan Cooperative Bank (5)		84,166		58,916	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 (6)		—		34,400	Repayable quarterly from December 28, 2023 to December 28, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Syndicated Loans from China Development Bank and 6 others (1)		1,915,577		—	Repayable semi-annually from October 20, 2016 to October 19, 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 (2)		12,415,200		11,766,832	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		35,668	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		21,000	Settlement due on December 25, 2026 with monthly interest payments.
Secured Long-Term Loan from Shanghai Commercial Bank (1)		22,200		16,650	Repayable monthly from January 19, 2022 to December 15, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Shanghai Commercial Bank (2)		—		4,980	Repayable quarterly from March 23, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Shanghai Commercial Bank (3)		—		45,000	Repayable quarterly from June 6, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from CTBC Bank		—		131,750	Repayable semi-annually from September 25, 2023 to September 25, 2028 with monthly interest payments. Interest-only payment for the first and the second year.
Unsecured Long-Term Loan from Bank of China		1,797,364		1,515,790	Repayable semi-annually from June 24, 2023 to June 24, 2026 with quarterly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan		2,000,000		1,333,333	Repayable quarterly from March 24, 2023 to December 24, 2025 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (1) (Note A)		300,000		—	Settlement due on February 25, 2026 with monthly interest payments.

	As of December 31,
Lenders	2022			2023			Redemption
	NT$			NT$
	(In Thousands)			(In Thousands)
Unsecured Revolving Loan from First Commercial Bank (2) (Note A)		300,000			—		Settlement due on March 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (3) (Note A)		200,000			—		Settlement due on June 15, 2026 with monthly interest payments.
Unsecured Revolving Loan from First Commercial Bank (4) (Note B)		—			800,000		Settlement due on July 13, 2028 with monthly interest payments.
Unsecured Revolving Loan from Yuanta Commercial Bank (Note C)		—			3,000,000		Repayable annually from March 2, 2023 to March 2, 2026 with monthly interest payments.
Unsecured Revolving Loan from CTBC Bank (Note D)		—			4,000,000		Settlement due on July 20, 2025 with monthly interest payments.
Subtotal		19,279,342			22,883,344
Less: Current portion		(2,485,053	)		(2,227,096	)
Total	$	16,794,289		$	20,656,248
	As of December 31,
	2022			2023
Interest rates applied		1.48% - 5.62%			1.67% - 6.56%

Note A: First Commercial Bank approved the 1-year credit loan on April 14, 2022, which offered UMC a revolving line of credit of NT$2 billion starting from the approval date to April 13, 2023. As of December 31, 2022, the unused line of credit was NT$1.2 billion.

Note B: First Commercial Bank approved the 1-year credit loan on April 25, 2023, which offered UMC a revolving line of credit of NT$2 billion starting from the approval date to April 24, 2024. As of December 31, 2023, the unused line of credit was NT$1.2 billion.

Note C: 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, 2022 and 2023, the unused line of credit were NT$4 billion and nil, respectively.

Note D: UMC entered into a 5-year loan agreement with CTBC Bank, effective from December 24, 2021. The agreement offered UMC a revolving line of credit of NT$4 billion. The expiration date of the agreement is July 20, 2025. As of December 31, 2022 and 2023, the unused line of credit were NT$4 billion and nil, respectively.

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,
	2021		2022			2023
	NT$		NT$			NT$
	(In Thousands)		(In Thousands)			(In Thousands)
Profit from continuing operations	$	5,193,495	$	1,626,103		$	4,307,614
Other comprehensive income (loss)		2,965,202		(1,706,960	)		1,540,436
Total comprehensive income (loss)	$	8,158,697	$	(80,857	)	$	5,848,050

Trade receivables [member]

Contents Of Significant Accounts [Line Items]

Financial Assets

(5)  Accounts Receivable, Net
	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Accounts receivable	$	36,653,611		$	29,316,612
Less: loss allowance		(209,101	)		(79,062	)
Net	$	36,444,510		$	29,237,550

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,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets mandatorily measured at fair value through profit or loss
Common stocks	$	10,275,563	$	9,170,230
Preferred stocks		2,939,939		2,862,119
Funds		5,044,702		4,472,097
Convertible bonds		230,365		480,715
Others		—		153,300
Total	$	18,490,569	$	17,138,461
Current	$	705,918	$	443,601
Non-current		17,784,651		16,694,860
Total	$	18,490,569	$	17,138,461

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,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Equity instruments
Common stocks	$	15,007,053	$	17,508,897
Preferred stocks		182,547		175,063
Total	$	15,189,600	$	17,683,960
Current	$	3,213,057	$	5,753,379
Non-current		11,976,543		11,930,581
Total	$	15,189,600	$	17,683,960

Financial assets measured at amortized cost [member]

Contents Of Significant Accounts [Line Items]

Financial Assets

(4) Financial assets measured at amortized cost

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets measured at amortized cost
Time deposits with original maturities over three months	$	849,308	$	6,353,768
Bonds		20,000		—
Total	$	869,308	$	6,353,768
Current	$	861,817	$	6,131,077
Non-current		7,491		222,691
Total	$	869,308	$	6,353,768

XML

Significant Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2023

Statement [Line Items]

Key Management Personnel Compensation

c. Key management personnel compensation

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Short-term employee benefits	$	562,117	$	2,047,118	$	1,462,964
Post-employment benefits		2,322		2,782		2,732
Share-based payment		1,035,401		719,786		500,391
Others		578		649		618
Total	$	1,600,418	$	2,770,335	$	1,966,705

Subsidiaries [member]

Statement [Line Items]

Significant Transactions Between the Company and Related Parties

a. Significant intercompany transactions between consolidated entities were as follows:

For the year ended December 31, 2021

Entity	Counterparty	Transactions (Note A)
		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		—

For the year ended December 31, 2022

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	68,554,072		Net 60 days
UMC	UMC-USA	Accounts receivable		9,502,922		—
UMC	USCXM	Sales		1,143,280 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		16,774		—
UMC	UDS	Sales		656,472		Net 30 days
UMC	UDS	Accounts receivable		6,734		—
UMC	USJC	Sales		164,855		Net 60 days
UMC	USJC	Accounts receivable		151,430		—
USJC	UMC-USA	Sales		4,272,900		Net 60 days
USJC	UMC-USA	Accounts receivable		744,082		—
USCXM	UMC-USA	Sales		1,565,670		Net 60 days
USCXM	UMC-USA	Accounts receivable		310,431		—
USCXM	UMC	Sales		1,035,407		Net 30 days - Net 45 days
USCXM	UMC	Accounts receivable		173		—
USCXM	UDS	Sales		148,259		Month-end 30 days
USCXM	UDS	Accounts receivable		171		—
WAVETEK	UMC-USA	Sales		716,357		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		81,819		—
WAVETEK	UMC	Sales		124,178		Month-end 30 days
HJ	UMC-USA	Sales		551,913		Net 60 days
HJ	UMC-USA	Accounts receivable		147,265		—
HJ	UDS	Sales		311,972		Month-end 30 days
HJ	UDS	Accounts receivable		9,500		—

For the year ended December 31, 2023

Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	61,923,652		Net 60 days
UMC	UMC-USA	Accounts receivable		5,827,800		—
UMC	USCXM	Sales		1,127,275 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		11,688		—
UMC	UDS	Sales		364,948		Net 30 days
UMC	UDS	Accounts receivable		10,800		—
USJC	UMC-USA	Sales		3,487,292		Net 60 days
USJC	UMC-USA	Accounts receivable		342,835		—
USCXM	UMC-USA	Sales		1,208,630		Net 60 days
USCXM	UMC-USA	Accounts receivable		17,816		—
USCXM	UMC	Sales		134,303		Net 30 days - Net 45 days
USCXM	UDS	Sales		286,087		Month-end 30 days
USCXM	UDS	Accounts receivable		362		—
WAVETEK	UMC-USA	Sales		505,806		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		53,916		—
HJ	UMC-USA	Sales		384,067		Net 60 days
HJ	UMC-USA	Accounts receivable		43,863		—
HJ	UDS	Sales		159,523		Month-end 30 days
HJ	UDS	Accounts receivable		2,696		—

Note A: The significant intercompany transactions listed above include downstream and upstream 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.

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
	UNIMICRON TECHNOLOGY CORP.	Associate
	SILICON INTEGRATED SYSTEMS CORP.	Associate (Note)
	PHOTRONICS DNP MASK CORPORATION	Other related party
	XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.	Directors and supervisors of subsidiaries
	FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP	Directors of subsidiaries

Note: Prior to August 2023, SIS held one board seat on UMC’s Board of Directors. Therefore, SIS was classified as other related party. Beginning from August 2023, the Company determines that it has significant influence over SIS and accounts for its investment in SIS as an associate. Please refer to Note 6(7) for the relevant information.

(ii) Operating revenues

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	2,778,544	$	5,744,098	$	3,018,171
Other related party		38,797		40,474		4,463
Total	$	2,817,341	$	5,784,572	$	3,022,634

(iii) Accounts receivable, net

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates
FARADAY TECHNOLOGY CORP. and its Subsidiaries
FARADAY TECHNOLOGY CORP.	$	441,963	$	302,828
ARTERY TECHNOLOGY CORPORATION, LTD.		56,864		40,886
Others		30,698		3,602
Other associates		—		648
Other related party		1,052		—
Total	$	530,577	$	347,964

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 30 - 60 days.

(iv) Refund liabilities (classified under other current liabilities)

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	1,545	$	636
Other related party		7		—
Total	$	1,552	$	636

(v) Significant asset transactions

Acquisition of financial assets at fair value through profit or loss, noncurrent

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

For the years ended December 31, 2022 and 2023: None.

Acquisition of subsidiaries’ ownership

For the years ended December 31, 2021 and 2022: None.

For the year ended December 31, 2023:

	Trading Capital Amount		Transaction underlying		Purchase price
	RMB¥				NT$
	(In Thousands)				(In Thousands)
XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.		3,741,862		Ownership of USCXM	$	17,945,970
FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP		674,762		Ownership of USCXM		3,263,473
Total		4,416,624			$	21,209,443

Please refer to Note 9(6) for the relevant information.

Acquisition of investments accounted for under the equity method

For the years ended December 31, 2021 and 2022: None.

For the year ended December 31, 2023:

	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		4,945	Stock of UNIMICRON	$	608,224

Please refer to Note 6(7) for the relevant information.

Acquisition of intangible assets

	Purchase price
	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
FARADAY TECHNOLOGY CORP.	$	181,254	$	266,053	$	323,551
(vi)  Others
Mask expenditure
	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Other related party	$	1,861,438	$	2,581,409	$	2,375,225
Other payables of mask expenditure
	As of December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Other related party	$	560,042	$	812,185	$	751,763

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Assets Pledged as Collateral (Tables)

12 Months Ended

Dec. 31, 2023

Disclosure Of Assets Pledged As Collateral [Abstract]

Summary of Assets Pledged as Collateral

The following table lists assets of the Company pledged as collateral:

	As of December 31,
	2022		2023		Party to which asset(s) was pledged	Purpose of pledge
	NT$		NT$
	(In Thousands)		(In Thousands)
Refundable Deposits (Time deposit)	$	812,248	$	813,289	Customs	Customs duty guarantee
Refundable Deposits (Time deposit)		236,587		236,556	Science Park Bureau	Collateral for land lease
Refundable Deposits (Time deposit)		29,371		18,647	Science Park Bureau	Collateral for dormitory lease
Refundable Deposits (Time deposit)		64,950		64,950	National Property Administration, Ministry of Finance	Guarantee for the application of national non-public use land for development
Refundable Deposits (Time deposit)		8,118		8,118	Bureau of Land Administration, Tainan City Government	Guarantee for the application of national non-public use land for development
Refundable Deposits (Time deposit)		34,100		36,970	Liquefied Natural Gas Business Division, CPC Corporation, Taiwan	Energy resources guarantee
Refundable Deposits (Time deposit)		1,043,840		1,006,852	Bank of China and Agricultural Bank of China	Bank performance guarantee
Refundable Deposits (Time deposit)		459,750		459,900	CTBC Bank Singapore Branch	Collateral for letter of credit
Buildings		4,828,597		4,487,730	Taiwan Cooperative Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Machinery and equipment		14,066,044		6,627,761	Taiwan Cooperative Bank, Mega International Commercial Bank, KGI Bank, First Commercial Bank, Shanghai Commercial Bank, CTBC Bank and Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Transportation equipment		592		—	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Furniture and fixtures		46,823		—	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Right-of-use assets		278,230		266,650	Secured Syndicated Loans from China Development Bank and 6 others	Collateral for long-term loans
Total	$	21,909,250	$	14,027,423

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Financial Risk and Fair Value Disclosures (Tables)

12 Months Ended

Dec. 31, 2023

Disclosure of detailed information about financial instruments [line items]

Categories of Financial Instruments

(1) Categories of financial instruments

	As of December 31,
Financial Assets	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial assets at fair value through profit or loss	$	18,490,569	$	17,138,461
Financial assets at fair value through other comprehensive income		15,189,600		17,683,960
Financial assets measured at amortized cost
Cash and cash equivalents (cash on hand excluded)		173,812,754		132,547,415
Receivables		38,783,086		32,292,914
Refundable deposits		2,749,691		2,708,823
Other financial assets		869,308		6,353,768
Total	$	249,895,008	$	208,725,341

	As of December 31,
Financial Liabilities	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Financial liabilities at fair value through profit or loss	$	438,397	$	1,019,362
Financial liabilities measured at amortized cost
Short-term loans		—		13,530,000
Payables		58,893,871		52,393,399
Guarantee deposits (current portion included)		30,757,001		41,599,386
Bonds payable (current portion included)		28,184,687		38,359,352
Long-term loans (current portion included)		19,279,342		22,883,344
Lease liabilities		5,737,095		5,393,187
Other financial liabilities		21,449,487		—
Total	$	164,739,880	$	175,178,030

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, 2022
	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
Payables	$	58,767,584	$	—	$	—	$	—	$	58,767,584
Guarantee deposits		238,416		3,867,087		169,419		26,482,079		30,757,001
Bonds payable (Note)		322,155		8,742,481		10,593,656		4,151,128		23,809,420
Long-term loans		3,246,153		8,425,744		7,798,280		3,031,293		22,501,470
Lease liabilities		658,092		1,222,822		1,207,385		4,299,914		7,388,213
Other financial liabilities		17,233,129		4,308,513		—		—		21,541,642
Total	$	80,465,529	$	26,566,647	$	19,768,740	$	37,964,414	$	164,765,330

	As of December 31, 2023
	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	$	13,780,612	$	—	$	—	$	—	$	13,780,612
Payables		52,202,821		—		—		—		52,202,821
Guarantee deposits		1,476,430		3,556,179		25,955,654		10,611,123		41,599,386
Bonds payable (Note)		14,797,772		10,980,506		12,321,345		2,132,963		40,232,586
Long-term loans		2,872,168		14,406,101		5,071,743		2,940,524		25,290,536
Lease liabilities		649,879		1,311,239		1,223,724		3,712,729		6,897,571
Total	$	85,779,682	$	30,254,025	$	44,572,466	$	19,397,339	$	180,003,512

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, 2022	$	3,584,326		$	2,580,246		$	3,464,652		$	234,936		$	9,864,160		$	2,351,603	$	151,859	$	2,503,462
Recognized in profit (loss)		(150,786	)		(328,602	)		519,572			(53,225	)		(13,041	)		—		—		—
Recognized in other comprehensive income (loss)		—			—			—			—			—			1,076,117		30,688		1,106,805
Acquisition		192,258			485,256			625,542			—			1,303,056			—		—		—
Disposal		(186,579	)		(15,782	)		(194,572	)		(149,850	)		(546,783	)		—		—		—
Return of capital		—			—			(26,672	)		—			(26,672	)		—		—		—
Transfer out of Level 3		(326,577	)		—			—			—			(326,577	)		—		—		—
Exchange effect		86,166			144,140			237,811			4,613			472,730			—		—		—
As of December 31, 2022	$	3,198,808		$	2,865,258		$	4,626,333		$	36,474		$	10,726,873		$	3,427,720	$	182,547	$	3,610,267

	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			Others			Total			Common stock			Preferred stock			Total
	NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$			NT$
	(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)			(In Thousands)
As of January 1, 2023	$	3,198,808		$	2,865,258		$	4,626,333		$	36,474		$	—		$	10,726,873		$	3,427,720		$	182,547		$	3,610,267
Recognized in profit (loss)		(312,149	)		(277,994	)		(617,764	)		(8,828	)		—			(1,216,735	)		—			—			—
Recognized in other comprehensive income (loss)		—			—			—			—			—			—			(365,395	)		(7,484	)		(372,879	)
Acquisition		610,153			294,046			294,245			—			154,761			1,353,205			—			—			—
Disposal		—			(89,997	)		—			(27,740	)		—			(117,737	)		—			—			—
Return of capital		(1,384	)		—			(36,346	)		—			—			(37,730	)		—			—			—
Transfer out of Level 3		(461,403	)		—			—			—			—			(461,403	)		—			—			—
Exchange effect		2,230			(4,679	)		8,428			94			(1,461	)		4,612			—			—			—
As of December 31, 2023	$	3,036,255		$	2,786,634		$	4,274,896		$	—		$	153,300		$	10,251,085		$	3,062,325		$	175,063		$	3,237,388

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, 2022	$	2,380,599
Recognized in profit (loss)		(1,433,405	)
Derecognition		(508,797	)
As of December 31, 2022	$	438,397

	Financial liabilities at fair value through profit or loss
	Derivatives
	NT$ (In Thousands)
As of January 1, 2023	$	438,397
Recognized in profit (loss)		580,965
As of December 31, 2023	$	1,019,362

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, 2022
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, 2022 by NT$273 million and NT$198 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2022 by NT$248 million.
Embedded derivatives in exchangeable bonds	Binomial tree valuation model	Volatility	36.46%	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, 2022 by NT$77 million and NT$67 million, respectively.

As of December 31, 2023
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, 2023 by NT$261 million and NT$199 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2023 by NT$214 million.
Embedded derivatives in exchangeable bonds	Binomial tree valuation model	Volatility	27.70%	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, 2023 by NT$119 million and NT$131 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, 2022
	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	$	669,444	$	—	$	36,474	$	705,918
Financial assets at fair value through profit or loss, noncurrent		6,626,088		468,164		10,690,399		17,784,651
Financial assets at fair value through other comprehensive income, current		3,213,057		—		—		3,213,057
Financial assets at fair value through other comprehensive income, noncurrent		8,366,276		—		3,610,267		11,976,543
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		—		438,397		438,397

	As of December 31, 2023
	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	$	443,601	$	—	$	—	$	443,601
Financial assets at fair value through profit or loss, noncurrent		6,424,475		19,300		10,251,085		16,694,860
Financial assets at fair value through other comprehensive income, current		5,753,379		—		—		5,753,379
Financial assets at fair value through other comprehensive income, noncurrent		8,693,193		—		3,237,388		11,930,581
Financial liabilities:
Financial liabilities at fair value through profit or loss, current		—		—		1,019,362		1,019,362

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

As of December 31, 2022
			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)	$	28,346,985	$	22,916,330	$	5,430,655	$	—	$	28,184,687
Long-term loans (current portion included)		19,279,342		—		19,279,342		—		19,279,342
As of December 31, 2023
			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)	$	38,367,168	$	32,827,211	$	5,539,957	$	—	$	38,359,352
Long-term loans (current portion included)		22,883,344		—		22,883,344		—		22,883,344

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Operating Segment Information (Tables)

12 Months Ended

Dec. 31, 2023

Disclosure of operating segments [abstract]

Geographic Non-current Assets Information

	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Taiwan	$	130,812,383	$	158,066,796
Singapore		29,080,766		55,322,448
China (includes Hong Kong)		37,213,538		33,424,815
Japan		10,736,562		13,415,669
Others		20,638		76,508
Total	$	207,863,887	$	260,306,236

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, 2021, 2022 and 2023 were as follows:

	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Customer A	$	21,935,208	$	24,061,849	$	16,615,745
Customer B	$	14,707,370	$	22,226,167	$	29,242,973

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Capital Management (Tables)

12 Months Ended

Dec. 31, 2023

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, 2022 and 2023 were as follows:

	As of December 31,
	2022			2023
	NT$			NT$
	(In Thousands)			(In Thousands)
Total liabilities	$	201,834,635		$	202,859,864
Less: Cash and cash equivalents		(173,818,777	)		(132,553,615	)
Net debt		28,015,858			70,306,249
Total equity		322,810,948			343,716,968
Total capital	$	350,826,806		$	414,023,217
Debt to capital ratios		7.99%			16.98%

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Summary of Material Accounting Policies - Consolidated Entities (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
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. (UME BV) [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. (UMC KOREA) [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. (USJC) [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	80.00%	80.14%
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	99.01%	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%
WAVETEK MICROELECTRONICS CORPORATION (USA) [member]
Disclosure of subsidiaries [line items]
Investor	WAVETEK
Business nature	Marketing service
Percentage of ownership	100.00%	0.00%
WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA) [member]
Disclosure of subsidiaries [line items]
Investor	WAVETEK
Business nature	Investment holding
Percentage of ownership	0.00%	100.00%
WAVETEK MICROELECTRONICS CORPORATION (USA) [member]
Disclosure of subsidiaries [line items]
Investor	WAVETEK-SAMOA
Business nature	Marketing service
Percentage of ownership	0.00%	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. (UDS) [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	100.00%	71.86%

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Summary of Material Accounting Policies - Additional Information (Detail) - Dec. 29, 2023	USD ($)	Exchange_Rate
Disclosure Of Initial Application Of Standards Or Interpretations [Abstract]
Convenience translation into U.S. Dollars, rate of USD1.00	1	30.62

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Summary of Material Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2023
Buildings [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	20 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]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	6 years
Transportation equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	6 years
Furniture and fixtures [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of the assets	6 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

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Summary of Material Accounting Policies - Intangible Assets - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023
Software [member]
Disclosure of initial application of standards or interpretations [line items]
Estimated useful life of intangible assets	3 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)

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Contents of Significant Accounts - Cash and Cash Equivalents (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)
Cash And Cash Equivalents [Abstract]
Cash on hand and petty cash	$ 6,200		$ 6,023
Checking and savings accounts	50,322,942		42,422,443
Time deposits	80,276,114		125,467,386
Repurchase agreements collateralized by government bonds and corporate notes	1,948,359		5,922,925
Total	$ 132,553,615	$ 4,328,988	$ 173,818,777	$ 5,676,642	$ 132,622,131	$ 94,048,036

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Contents of Significant Accounts - Financial Assets at Fair Value through Profit or Loss (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of financial assets [line items]
Total	$ 17,138,461		$ 18,490,569
Current	443,601	$ 14,487	705,918
Noncurrent	16,694,860	$ 545,227	17,784,651
Common stocks [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	9,170,230		10,275,563
Preferred stocks [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	2,862,119		2,939,939
Funds [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	4,472,097		5,044,702
Convertible bonds [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	480,715		230,365
Others [member]
Disclosure of financial assets [line items]
Financial assets mandatorily measured at fair value through profit or loss	$ 153,300		$ 0

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Contents of Significant Accounts - Financial Assets at Fair Value through Other Comprehensive Income (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of financial assets [line items]
Financial assets at fair value through other comprehensive income, current	$ 5,753,379	$ 187,896	$ 3,213,057
Financial assets at fair value through other comprehensive income, non-current	11,930,581	$ 389,634	11,976,543
Total	17,683,960		15,189,600
Common stocks [member]
Disclosure of financial assets [line items]
Total	17,508,897		15,007,053
Preferred stocks [member]
Disclosure of financial assets [line items]
Total	$ 175,063		$ 182,547

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Contents of Significant Accounts - Summary of Fair Value of Each Investment in Equity Instrument (Detail) - TWD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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	$ 5,753,000	$ 3,213,000
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	0	2,316,197
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	2,514,120	2,847,385
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	2,100,977	1,023,266
NOVATEK MICROELECTRONICS CORP. (NOVATEK) [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	8,501,851	5,188,267
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	548,205	580,335
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	175,063	182,547
CHIPBOND TECHNOLOGY CORPORATION [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	$ 3,843,744	$ 3,051,603

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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, 2023	Dec. 31, 2022
Dividend Income [Abstract]
Held at end of period	$ 1,052,336	$ 1,431,931
Derecognized during the period	142,535	0
Total	$ 1,194,871	$ 1,431,931

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Contents of Significant Accounts - Summary of Details on Derecognition of Such Investments (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disposed and Derecognized Investments Designated as Fair Value Through Other Comprehensive Income [Abstract]
Fair value on the date of disposal	$ 3,035,999	$ 0	$ 0
Cumulative gains (losses) reclassified to retained earnings due to derecognition	$ (1,628,388)	$ 0	$ 0

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Contents of Significant Accounts - Financial Assets Measured at Amortized Cost (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Financial Assets Measured At Amortized Cost [Abstract]
Time deposits with original maturities over three months	$ 6,353,768		$ 849,308
Bonds	0		20,000
Total	6,353,768		869,308
Current	6,131,077	$ 200,231	861,817
Non-current	$ 222,691	$ 7,273	$ 7,491

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Contents of Significant Accounts - Accounts Receivable, Net (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of financial assets [line items]
Accounts receivable	$ 29,237,550	$ 954,851	$ 36,444,510
Cost [member]
Disclosure of financial assets [line items]
Accounts receivable	29,316,612		36,653,611
Loss Allowance [member]
Disclosure of financial assets [line items]
Less: loss allowance	$ (79,062)		$ (209,101)

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Contents of Significant Accounts - Aging Analysis of Accounts Receivable (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of financial assets [line items]
Accounts receivable	$ 29,237,550	$ 954,851	$ 36,444,510
Cost [member]
Disclosure of financial assets [line items]
Accounts receivable	29,316,612		36,653,611
Neither past due [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable	25,707,008		30,545,437
Past due [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable	3,609,604		6,108,174
Past due [member] | Less than or equal to 30 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable	3,008,126		5,303,765
Past due [member] | 31 to 60 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable	78,668		130,408
Past due [member] | 61 to 90 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable	5,599		3,247
Past due [member] | 91 to 120 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable	0		7,886
Past due [member] | Greater than or equal to 121 days [member] | Cost [member]
Disclosure of financial assets [line items]
Accounts receivable	$ 517,211		$ 662,868

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Contents of Significant Accounts - Movement of Loss Allowance (Detail) - Accounts receivable [member] - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of financial assets [line items]
Beginning balance	$ 209,101	$ 194,491
Net recognition (reversal) for the period	(130,039)	14,610
Ending balance	$ 79,062	$ 209,101

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Contents of Significant Accounts - Accounts Receivable, Net - Additional Information (Detail)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Classes Of Inventories [Abstract]
Raw materials	$ 10,995,569		$ 6,335,428
Supplies and spare parts	6,443,172		7,161,216
Work in process	15,560,517		14,897,926
Finished goods	2,713,300		2,675,390
Total	$ 35,712,558	$ 1,166,315	$ 31,069,960

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Contents of Significant Accounts - Inventories, Net - Additional Information (Detail) - TWD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Classes Of Inventories [Abstract]
Inventories recognized in operating costs	$ 136,902,000,000	$ 145,979,000,000	$ 135,856,000,000
Write-down of inventories	1,148,000,000	98,000,000
Inventories pledged	$ 0	$ 0
Reversal of write-down of inventories			$ 426,000,000

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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, 2023 TWD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2023 USD ($)
Investments in associates and joint ventures [line items]
Amount	$ 32,785,800	$ 26,504,913	$ 1,070,731
SILICON INTEGRATED SYSTEMS CORP. (SIS) [member]
Investments in associates and joint ventures [line items]
Amount	$ 2,373,060	$ 0
Percentage of ownership or voting rights, Associates	19.02%	0.00%
FARADAY TECHNOLOGY CORP. (FARADAY) [member]
Investments in associates and joint ventures [line items]
Amount	$ 1,990,073	$ 1,862,245
Percentage of ownership or voting rights, Associates	13.78%	13.78%
UNIMICRON TECHNOLOGY CORP. (UNIMICRON) [member]
Investments in associates and joint ventures [line items]
Amount	$ 13,644,560	$ 13,285,169
Percentage of ownership or voting rights, Associates	13.05%	13.27%
MTIC HOLDINGS PTE. LTD. [member]
Investments in associates and joint ventures [line items]
Amount	$ 0	$ 0
Percentage of ownership or voting rights, Associates	45.44%	45.44%
UNITECH CAPITAL INC. [member]
Investments in associates and joint ventures [line items]
Amount	$ 625,667	$ 426,070
Percentage of ownership or voting rights, Associates	42.00%	42.00%
TRIKNIGHT CAPITAL CORPORATION (TRIKNIGHT) [member]
Investments in associates and joint ventures [line items]
Amount	$ 2,109,906	$ 2,117,678
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	$ 235,098	$ 210,690
Percentage of ownership or voting rights, Associates	40.00%	40.00%
PURIUMFIL INC. [member]
Investments in associates and joint ventures [line items]
Amount	$ 11,474	$ 14,622
Percentage of ownership or voting rights, Associates	40.00%	40.00%
HSUN CHIEH INVESTMENT CO., LTD. (HSUN CHIEH) [member]
Investments in associates and joint ventures [line items]
Amount	$ 4,126,878	$ 2,980,984
Percentage of ownership or voting rights, Associates	36.49%	36.49%
YANN YUAN INVESTMENT CO., LTD. (YANN YUAN) [member]
Investments in associates and joint ventures [line items]
Amount	$ 7,516,327	$ 5,455,743
Percentage of ownership or voting rights, Associates	26.78%	26.78%
UNITED LED CORPORATION HONG KONG LIMITED [member]
Investments in associates and joint ventures [line items]
Amount	$ 93,793	$ 97,156
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	$ 0
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	$ 58,964	$ 54,556
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		1 Months Ended			12 Months Ended
	Jan. 06, 2023 shares	Dec. 31, 2023 TWD ($)	Jun. 30, 2023 TWD ($)	Apr. 30, 2023 TWD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2023 USD ($)
Investments in associates [Line Items]
Investments accounted for using equity method for which there are published price quotations		$ 32,785,800			$ 32,785,800		$ 26,504,913		$ 1,070,731
Proceeds from capital reduction of investments accounted for under the equity method					1,303,106	$ 42,557	0	$ 0
HSUN CHIEH INVESTMENT CO., LTD. (HSUN CHIEH) [member]
Investments in associates [Line Items]
Investments accounted for using equity method for which there are published price quotations		4,126,878			4,126,878		2,980,984
Proceeds from capital reduction of investments accounted for under the equity method				$ 343,000
TRIKNIGHT CAPITAL CORPORATION (TRIKNIGHT) [member]
Investments in associates [Line Items]
Investments accounted for using equity method for which there are published price quotations		2,109,906			2,109,906		2,117,678
Proceeds from capital reduction of investments accounted for under the equity method		560,000	$ 400,000
UNIMICRON TECHNOLOGY CORP. (UNIMICRON) [member]
Investments in associates [Line Items]
Investments accounted for using equity method for which there are published price quotations		13,644,560			13,644,560		13,285,169
UNIMICRON TECHNOLOGY CORP. (UNIMICRON) [member] | SUBTRON TECHNOLOGY CO., LTD. (SUBTRON) [member]
Investments in associates [Line Items]
Number of shares exchanged | shares	23,000,000
Number of shares allotted | shares	5,000,000
Share exchange description	1 common share of SUBTRON to exchange 0.219 common shares of UNIMICRON
Aggregated individually immaterial associates [member]
Investments in associates [Line Items]
Exchange differences arising from translation of the foreign entity					(3,000)		103,000	$ (30,000)
Investments with published price quotations [member]
Investments in associates [Line Items]
Investments accounted for using equity method for which there are published price quotations		18,008,000			18,008,000		15,147,000
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		$ 53,726,000			$ 53,726,000		$ 28,416,000

XML

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, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Disclosure of associates [line items]
Profit from continuing operations	$ 4,307,614	$ 140,680	$ 1,626,103	$ 5,193,495
Aggregated individually immaterial associates [member]
Disclosure of associates [line items]
Profit from continuing operations	4,307,614		1,626,103	5,193,495
Other comprehensive income (loss)	1,540,436		(1,706,960)	2,965,202
Total comprehensive income (loss)	$ 5,848,050		$ (80,857)	$ 8,158,697

XML

Contents of Significant Accounts - Property, Plant and Equipment (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 170,982,066
Depreciation	37,757,556	$ 1,233,101	$ 41,328,374	$ 44,179,632
Ending balance	239,123,248	$ 7,809,381	170,982,066
Property, plant and equipment not subject to operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	169,163,819
Ending balance	237,376,554		169,163,819
Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,818,247
Ending balance	1,746,694		1,818,247
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	1,056,441,607		966,403,970
Additions	82,436,942		72,596,881
Disposals	6,633,773		6,560,736
Transfers and reclassifications	24,842,622		7,734,514
Exchange effect	(4,418,722)		16,266,978
Ending balance	1,152,668,676		1,056,441,607	966,403,970
Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	4,329,670		4,284,102
Disposals			660
Transfers and reclassifications	54,469		20,681
Exchange effect	(11,434)		25,547
Ending balance	4,372,705		4,329,670	4,284,102
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	(887,277,788)		(838,414,466)
Depreciation	36,948,137		40,471,553
Disposals	(6,592,557)		(6,430,846)
Transfers and reclassifications			(4,928)
Exchange effect	(2,341,246)		14,827,543
Ending balance	(915,292,122)		(887,277,788)	(838,414,466)
Accumulated depreciation, amortisation and impairment [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(2,511,423)		(2,331,903)
Depreciation	118,339		154,873
Disposals			(660)
Transfers and reclassifications			6,395
Exchange effect	(3,751)		18,912
Ending balance	(2,626,011)		(2,511,423)	(2,331,903)
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	1,470,216
Ending balance	1,430,338		1,470,216
Land [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	545,787
Ending balance	539,703		545,787
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	1,470,216		1,491,343
Additions	0
Disposals	0
Transfers and reclassifications	0
Exchange effect	(39,878)		(21,127)
Ending balance	1,430,338		1,470,216	1,491,343
Land [member] | Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	545,787		549,010
Transfers and reclassifications	0
Exchange effect	(6,084)		(3,223)
Ending balance	539,703		545,787	549,010
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
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		0
Depreciation	0
Exchange effect	0
Ending balance	0		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	14,866,263
Ending balance	14,341,723		14,866,263
Buildings [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,240,435
Ending balance	1,143,849		1,240,435
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	37,597,769		36,827,480
Additions	223,177		325,943
Disposals	12,160		69,897
Transfers and reclassifications	902,122		219,666
Exchange effect	(341,045)		294,577
Ending balance	38,369,863		37,597,769	36,827,480
Buildings [member] | Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	2,443,247		2,422,389
Transfers and reclassifications	0		(1,226)
Exchange effect	(2,330)		22,084
Ending balance	2,440,917		2,443,247	2,422,389
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	(22,731,506)		(21,184,969)
Depreciation	1,416,727		1,443,545
Disposals	(12,160)		(69,489)
Transfers and reclassifications			161
Exchange effect	(107,933)		172,320
Ending balance	(24,028,140)		(22,731,506)	(21,184,969)
Buildings [member] | Accumulated depreciation, amortisation and impairment [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(1,202,812)		(1,095,113)
Depreciation	94,944		94,644
Transfers and reclassifications			(161)
Exchange effect	(688)		13,216
Ending balance	(1,297,068)		(1,202,812)	(1,095,113)
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	96,081,903
Ending balance	137,410,147		96,081,903
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	953,819,688		897,806,699
Additions	0
Disposals	6,475,636		6,391,003
Transfers and reclassifications	77,170,979		46,548,734
Exchange effect	(3,016,210)		15,855,258
Ending balance	1,021,498,821		953,819,688	897,806,699
Machinery and equipment [member] | Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	6,345		0
Transfers and reclassifications	0		6,345
Exchange effect	0
Ending balance	6,345		6,345	0
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	(857,737,785)		(810,904,881)
Depreciation	35,031,869		38,565,229
Disposals	(6,468,067)		(6,331,532)
Transfers and reclassifications			(4,913)
Exchange effect	(2,212,913)		14,604,120
Ending balance	(884,088,674)		(857,737,785)	(810,904,881)
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	(6,345)		0
Depreciation	0
Transfers and reclassifications			6,345
Exchange effect	0
Ending balance	(6,345)		(6,345)	0
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	13,326
Ending balance	15,455		13,326
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	64,923		55,959
Additions	0
Disposals	0
Transfers and reclassifications	7,104		8,154
Exchange effect	(315)		810
Ending balance	71,712		64,923	55,959
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	(51,597)		(47,108)
Depreciation	4,924		3,946
Disposals	0
Exchange effect	(264)		543
Ending balance	(56,257)		(51,597)	(47,108)
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	1,364,476
Ending balance	1,817,455		1,364,476
Furniture and fixtures [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	32,025
Ending balance	63,142		32,025
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	8,061,993		7,305,174
Additions	0
Disposals	112,396		27,782
Transfers and reclassifications	953,582		730,317
Exchange effect	(29,711)		54,284
Ending balance	8,873,468		8,061,993	7,305,174
Furniture and fixtures [member] | Cost [member] | Operating Leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,334,291		1,312,703
Disposals			660
Transfers and reclassifications	54,469		15,562
Exchange effect	(3,020)		6,686
Ending balance	1,385,740		1,334,291	1,312,703
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	(6,697,517)		(6,222,383)
Depreciation	490,468		456,017
Disposals	(112,330)		(27,421)
Transfers and reclassifications			(176)
Exchange effect	(19,642)		46,714
Ending balance	(7,056,013)		(6,697,517)	(6,222,383)
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	(1,302,266)		(1,236,790)
Depreciation	23,395		60,229
Disposals			(660)
Transfers and reclassifications			211
Exchange effect	(3,063)		5,696
Ending balance	(1,322,598)		(1,302,266)	(1,236,790)
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	3,692
Ending balance	2,785		3,692
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	63,075		61,282
Additions	0
Disposals	0		2,414
Transfers and reclassifications	3,379		421
Exchange effect	(631)		3,786
Ending balance	65,823		63,075	61,282
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	(59,383)		(55,125)
Depreciation	4,149		2,816
Disposals	0		(2,404)
Exchange effect	(494)		3,846
Ending balance	(63,038)		(59,383)	(55,125)
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	55,363,943
Ending balance	82,358,651		55,363,943
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	55,363,943		22,856,033
Additions	82,213,765		72,270,938
Disposals	33,581		69,640
Transfers and reclassifications	(54,194,544)		(39,772,778)
Exchange effect	(990,932)		79,390
Ending balance	82,358,651		55,363,943	$ 22,856,033
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
Exchange effect	0
Ending balance	$ 0		$ 0

XML

Contents of Significant Accounts - Summary of Interest Expense Capitalized (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Detailed Information About Interest Expense Capitalized [Line Items]
Interest expense capitalized	$ 9,355	$ 1,661
Bottom of range [member]
Disclosure Of Detailed Information About Interest Expense Capitalized [Line Items]
Interest rates applied	1.48%	1.44%
Top of range [member]
Disclosure Of Detailed Information About Interest Expense Capitalized [Line Items]
Interest rates applied	1.65%	1.61%

XML

Contents of Significant Accounts - Leases (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2023 USD ($)
Disclosure Of Lease By Lessee [Line Items]
Depreciation	$ 691,080	$ 701,948
Right-of-use assets	7,000,355	7,611,991	$ 228,620
Current	514,324	537,314	16,797
Noncurrent	4,878,863	5,199,781	$ 159,336
Total	5,393,187	5,737,095
Land [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	377,593	359,007
Right-of-use assets	5,318,986	5,714,166
Buildings [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	93,610	119,641
Right-of-use assets	156,483	124,420
Machinery and equipment [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	203,606	206,445
Right-of-use assets	1,506,824	1,748,244
Transportation equipment [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	13,267	12,287
Right-of-use assets	16,356	21,485
Other property, plant and equipment [member]
Disclosure Of Lease By Lessee [Line Items]
Depreciation	3,004	4,568
Right-of-use assets	$ 1,706	$ 3,676

XML

Contents of Significant Accounts - Leases - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosures Of Leases [Abstract]
Addition to right of use assets	$ 206	$ 1,130

XML

Contents of Significant Accounts - Intangible Assets (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	$ 4,275,200
Ending balance	4,372,555	$ 142,801	$ 4,275,200
Net carrying amount:
Intangible assets	4,372,555		4,275,200
Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	12,061,215		12,699,284
Additions	2,746,105		3,194,414
Write-off	(3,957,885)		(4,071,911)
Reclassifications	(5,855)		(10,721)
Exchange effect	(278,309)		250,149
Ending balance	10,565,271		12,061,215
Net carrying amount:
Intangible assets	10,565,271		12,061,215
Accumulated amortisation and impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	(7,786,015)		(9,054,351)
Amortization	2,555,610		2,689,600
Write-off	(3,957,885)		(4,071,911)
Exchange effect	(191,024)		113,975
Ending balance	(6,192,716)		(7,786,015)
Net carrying amount:
Intangible assets	(6,192,716)		(7,786,015)
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 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	2,980,390
Ending balance	2,575,246		2,980,390
Net carrying amount:
Intangible assets	2,575,246		2,980,390
Software [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	5,669,787		4,845,037
Additions	1,399,699		2,713,534
Write-off	(1,498,642)		(1,857,289)
Reclassifications	(5,855)		(10,721)
Exchange effect	(98,912)		(20,774)
Ending balance	5,466,077		5,669,787
Net carrying amount:
Intangible assets	5,466,077		5,669,787
Software [member] | Accumulated amortisation and impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	(2,689,397)		(2,913,824)
Amortization	1,741,898		1,656,765
Write-off	(1,498,642)		(1,857,289)
Exchange effect	(41,822)		(23,903)
Ending balance	(2,890,831)		(2,689,397)
Net carrying amount:
Intangible assets	(2,890,831)		(2,689,397)
Patent and technology license fee [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	824,919
Ending balance	864,576		824,919
Net carrying amount:
Intangible assets	864,576		824,919
Patent and technology license fee [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	3,422,432		4,491,164
Additions	346,896		0
Write-off	(1,826,383)		(1,344,682)
Reclassifications	0
Exchange effect	(169,404)		275,950
Ending balance	1,773,541		3,422,432
Net carrying amount:
Intangible assets	1,773,541		3,422,432
Patent and technology license fee [member] | Accumulated amortisation and impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	(2,597,513)		(3,324,667)
Amortization	277,768		475,870
Write-off	(1,826,383)		(1,344,682)
Exchange effect	(139,933)		141,658
Ending balance	(908,965)		(2,597,513)
Net carrying amount:
Intangible assets	(908,965)		(2,597,513)
Others [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	462,277
Ending balance	925,119		462,277
Net carrying amount:
Intangible assets	925,119		462,277
Others [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	2,953,984		3,348,071
Additions	999,510		480,880
Write-off	(632,860)		(869,940)
Reclassifications	0
Exchange effect	(9,993)		(5,027)
Ending balance	3,310,641		2,953,984
Net carrying amount:
Intangible assets	3,310,641		2,953,984
Others [member] | Accumulated amortisation and impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Beginning balance	(2,491,707)		(2,808,462)
Amortization	535,944		556,965
Write-off	(632,860)		(869,940)
Exchange effect	(9,269)		(3,780)
Ending balance	(2,385,522)		(2,491,707)
Net carrying amount:
Intangible assets	$ (2,385,522)		$ (2,491,707)

XML

Contents of Significant Accounts - Amortization Amounts of Intangible Assets (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating costs [member]
Disclosure Of Intangible Assets [Line Items]
Amortization amounts of intangible assets	$ 1,144,960	$ 1,329,850
Operating expenses [member]
Disclosure Of Intangible Assets [Line Items]
Amortization amounts of intangible assets	$ 1,410,650	$ 1,359,750

XML

Contents of Significant Accounts - Short-Term Loans (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of detailed information about borrowings [line items]
Short-term loans	$ 13,530,000	$ 441,868	$ 0
Interest rates applied			0.00%
Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rates applied	1.69%	1.69%
Top of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rates applied	2.65%	2.65%
Unsecured bank loans [member]
Disclosure of detailed information about borrowings [line items]
Short-term loans	$ 13,530,000		$ 0

XML

Contents of Significant Accounts - Financial Liabilities at Fair Value through Profit or Loss, Current (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Current Financial Liabilities At Fair Value Through Profit Or Loss [Line Items]
Financial liabilities at fair value through profit or loss, current	$ 1,019,362	$ 33,291	$ 438,397
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	$ 1,019,362		$ 438,397

XML

Contents of Significant Accounts - Bonds Payable (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of detailed information about bonds [Line Items]
Bonds payable	$ 38,359,352		$ 28,184,687
Less: Current or exchangeable portion due within one year	(13,779,701)		(5,101,591)
Net	24,579,651	$ 802,732	23,083,096
Less: Discounts on bonds payable [member]
Disclosure of detailed information about bonds [Line Items]
Bonds payable	(498,021)		(672,686)
Unsecured domestic bonds payable [member] | Cost [member]
Disclosure of detailed information about bonds [Line Items]
Bonds payable	33,100,000		23,100,000
Unsecured exchangeable bonds payable [member] | Cost [member]
Disclosure of detailed information about bonds [Line Items]
Bonds payable	$ 5,757,373		$ 5,757,373

XML

Contents of Significant Accounts - Summary of Terms and Conditions of Bonds (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about bonds [Line Items]
Issued amount	$ 38,359,352	$ 28,184,687
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 was paid annually and the principal was fully repaid in March 2022.
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 was paid annually and the principal was fully repaid in October 2022.
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.
Domestic Unsecured Corporate Bonds Maturing In September 2028 [Member]
Disclosure of detailed information about bonds [Line Items]
Term	Five-year (Green bond)
Issuance date	In mid-September 2023
Issued amount	$ 10,000,000
Coupon rate	1.62%
Repayment	Interest will be paid annually and the principal will be repayable in September 2028 upon maturity.

XML

Contents of Significant Accounts - Bonds Payable - Additional Information (Detail)				12 Months Ended
	Jul. 07, 2026	Jul. 07, 2024	Jul. 07, 2021 USD ($) TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 TWD ($) $ / shares	Dec. 31, 2022 TWD ($)	Jul. 07, 2021 $ / shares
Disclosure of detailed information about bonds [Line Items]
Bonds issued amount						$ 38,359,352,000	$ 28,184,687,000
Bonds repurchased and cancelled value				$ 0	$ 187,100,000
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%
Percentage of principal amount to redeem bonds on maturity date	96.92%
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]
Exchange price per share | $ / shares						$ 533.8		$ 731.25

XML

Contents of Significant Accounts - Details of Long-term Loans (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 22,883,344		$ 19,279,342
Less: Current portion	(2,227,096)		(2,485,053)
Total	20,656,248	$ 674,600	16,794,289
Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 22,883,344		$ 19,279,342
Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rates applied	1.67%	1.67%	1.48%
Top of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rates applied	6.56%	6.56%	5.62%
Secured Long-Term Loan from Mega International Commercial Bank (1) [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 (1) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 4,866		$ 9,732
Secured Long-Term Loan from Mega International Commercial Bank (2) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from February 23, 2022 to February 22, 2027 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	$ 13,765		18,000
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	$ 23,784		35,676
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	$ 0		4,375
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	$ 20,000		32,000
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	$ 10,345		16,552
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	$ 58,916		84,166
Secured Syndicated Loans from China Development Bank and 6 others (1) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable semi-annually from October 20, 2016 to October 19, 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) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 0		1,915,577
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	$ 11,766,832		12,415,200
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	$ 35,668		47,000
Secured Long-Term Loan from KGI Bank [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Settlement due on December 25, 2026 with monthly interest payments.
Secured Long-Term Loan from KGI Bank [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 21,000		21,000
Secured Long-Term Loan from Shanghai Commercial Bank(1) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable monthly from January 19, 2022 to December 15, 2026 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Shanghai Commercial Bank(1) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 16,650		22,200
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	$ 1,515,790		1,797,364
Unsecured Long-Term Loan from Bank of Taiwan [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from March 24, 2023 to December 24, 2025 with monthly interest payments.
Unsecured Long-Term Loan from Bank of Taiwan [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 1,333,333		2,000,000
Unsecured Revolving Loan from First Commercial Bank (1) (Note A) [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 (1) (Note A) [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 A) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Settlement due on March 15, 2026 with monthly interestpayments.
Unsecured Revolving Loan from First Commercial Bank (2) (Note A) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 0		300,000
Unsecured Revolving Loan from First Commercial Bank (3) (Note A) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Settlement due on June 15, 2026 with monthly interestpayments.
Unsecured Revolving Loan from First Commercial Bank (3) (Note A) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 0		200,000
Unsecured Revolving Loan from First Commercial Bank (4) (Note B) [Member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 800,000		0
Redemption	Settlement due on July 13, 2028 with monthly interest payments.
Secured Long-Term Loan from CTBC Bank [Member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 131,750		0
Redemption	Repayable semi-annually from September 25, 2023 to September 25, 2028 with monthly interest payments. Interest-only payment for the first and the second year.
Secured Long-Term Loan from Taiwan Cooperative Bank (6) [Member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 34,400		0
Redemption	Repayable quarterly from December 28, 2023 to December 28, 2028 with monthly interest payments. Interest-only payment for the first year.
Unsecured Revolving Loan from CTBC Bank (Note D) [member]
Disclosure of detailed information about borrowings [line items]
Redemption	Settlement due on July 20, 2025 with monthly interest payments.
Unsecured Revolving Loan from CTBC Bank (Note D) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 4,000,000		0
Secured Long-Term Loan from Shanghai Commercial Bank (3) [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans			0
Redemption	Repayable quarterly from June 6, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Shanghai Commercial Bank (3) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 45,000
Secured Long-Term Loan from Shanghai Commercial Bank (2) [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans			0
Redemption	Repayable quarterly from March 23, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Shanghai Commercial Bank (2) [member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 4,980
Secured Long-Term Loan from Mega International Commercial Bank (3) [Member]
Disclosure of detailed information about borrowings [line items]
Redemption	Repayable quarterly from December 22, 2022 to February 23, 2027 with monthly interest payments. Interest-only payment for the first year.
Secured Long-Term Loan from Mega International Commercial Bank (3) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 46,265		60,500
Unsecured Revolving Loan from Yuanta Commercial Bank (Note C) [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 C) [Member] | Cost [member]
Disclosure of detailed information about borrowings [line items]
Long-term loans	$ 3,000,000		$ 0

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Contents of Significant Accounts - Long-Term Loans - Additional Information (Detail) - TWD ($) $ in Millions	Apr. 25, 2023	Apr. 14, 2022	Dec. 24, 2021	Mar. 03, 2021	Dec. 31, 2023	Dec. 31, 2022
Secured syndicated loans from China development bank [member]
Disclosure of detailed information about borrowings [line items]
Endorsement					$ 9,946	$ 7,878
Secured syndicated loans from China development bank [member] | HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member]
Disclosure of detailed information about borrowings [line items]
Endorsement					1,686	2,407
Secured syndicated loans from China development bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Endorsement					10,351	17,876
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					2,934	7,547
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					0	4,000
CTBC 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					0	4,000
First Commercial Bank [Member] | 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	$ 2,000
Unused line of credit					$ 1,200	$ 1,200

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Contents of Significant Accounts - Post-Employment Benefits - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of defined benefit plans and defined contribution plans [Line Items]
Actual returns on plan assets	$ 37	$ 136
Expected pension fund contribution in 2024	$ 700
Weighted-average durations of defined benefit obligation	6 years	7 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	$ 45	$ 34	$ 23
Defined contribution plan [member]
Disclosure of defined benefit plans and defined contribution plans [Line Items]
Percentage of employees' monthly salary or wages as monthly contributions to defined contribution plan	6.00%	6.00%	6.00%
Pension expenses	$ 1,655	$ 1,880	$ 1,636

XML

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, 2023	Dec. 31, 2022
Present value of defined benefit obligation [member]
Disclosure of net defined benefit liability (asset) [line items]
Beginning balance	$ (5,106,623)	$ (5,458,333)
Service cost	(9,893)	(9,911)
Interest income (cost)	(63,322)	(33,842)
Subtotal	(73,215)	(43,753)
Arising from changes in financial assumptions	166,401	227,790
Experience adjustments	226,634	(56,959)
Subtotal	393,035	170,831
Benefits paid	121,305	224,632
Ending balance	(4,665,498)	(5,106,623)
Plan assets [member]
Disclosure of net defined benefit liability (asset) [line items]
Beginning balance	2,237,221	1,581,012
Interest income (cost)	27,742	9,802
Contribution by employer	307,556	745,066
Benefits paid	(121,305)	(224,632)
Return on plan assets, excluding amounts included in interest income	9,199	125,973
Ending balance	$ 2,460,413	$ 2,237,221

XML

Contents of Significant Accounts - Defined Benefit Plan Recognized on the Consolidated Balance Sheets (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure Of Defined Benefit Plans [Abstract]
Present value of the defined benefit obligation	$ (4,665,498)		$ (5,106,623)
Fair value of plan assets	2,460,413		2,237,221
Funded status	(2,205,085)		(2,869,402)
Net defined benefit liabilities, noncurrent recognized on the consolidated balance sheets	$ (2,205,085)	$ (72,014)	$ (2,869,402)

XML

Contents of Significant Accounts - Major Categories of Plan Assets as a Percentage of Fair Value of the Total Plan Assets (Detail)	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Fair Value Of Plan Assets [Abstract]
Cash	21.00%	20.00%
Equity instruments	46.00%	47.00%
Debt instruments	23.00%	22.00%
Others	10.00%	11.00%

XML

Contents of Significant Accounts - Principal Underlying Actuarial Assumptions (Detail)	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Defined Benefit Plans [Abstract]
Discount rate	1.20%	1.24%
Rate of future salary increase	3.50%	4.25%

XML

Contents of Significant Accounts - Expected Future Benefit Payments (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)
Disclosure of defined benefit plans [line items]
Expected future benefit payments	$ 5,025,532
Not later than one year [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	596,934
Later than one year and not later than two years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	529,837
Later than two years and not later than three years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	486,833
Later than three years and not later than four years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	465,919
Later than four years and not later than five years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	434,293
Later than five years [member]
Disclosure of defined benefit plans [line items]
Expected future benefit payments	$ 2,511,716

XML

Contents of Significant Accounts - Sensitivity Analysis (Detail) - TWD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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	$ 137,615	$ 172,801
Decrease (increase) in defined benefit obligation due to 0.5% decrease in actuarial assumptions	$ (144,683)	$ (182,478)
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	$ (117,784)	$ (151,050)
Decrease (increase) in defined benefit obligation due to 0.5% decrease in actuarial assumptions	$ 113,478	$ 145,000
Percentage increase in actuarial assumptions	0.50%	0.50%
Percentage decrease in actuarial assumptions	0.50%	0.50%

XML

Contents of Significant Accounts - Deferred Government Grants (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Miscellaneous Liabilities [Abstract]
Beginning balance	$ 4,677,444	$ 8,543,798
Arising during the period	591,086	174,352
Other operating income	(2,663,843)	(4,164,189)
Exchange effect	(57,665)	123,483
Ending balance	2,547,022	4,677,444
Current (classified under other current liabilities)	717,457	2,681,842
Non-current (classified under other noncurrent liabilities)	1,829,565	1,995,602
Total	$ 2,547,022	$ 4,677,444

XML

Contents of Significant Accounts - Refund Liabilities - Summary of Refund Liabilities (classified under other current liabilities) (Detail) - TWD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Refund Liability [Abstract]
Refund liabilities	$ 3,033,576	$ 1,139,227

XML

Contents of Significant Accounts - Summary of Provisions (Detail) - TWD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Contents Of Significant Accounts [Abstract]
Onerous Contracts (classified under other current liabilities)	$ 57,800	$ 469,779
Decommissioning Liabilities (classified under other noncurrent liabilities)	602,433	366,863
Total	$ 660,233	$ 836,642

XML

Contents of Significant Accounts - Summary of Information about Provisions of Liabilities (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)
Onerous Contracts [member]
Disclosure of other provisions [line items]
Balance as of January 1, 2023	$ 469,779
Arising during the period	40,154
Unused provision reversed	(450,968)
Discount rate adjustment and unwinding of discount from the passage of time	0
Exchange effect	(1,165)
Balance as of December 31, 2023	57,800
Decommissioning Liabilities [member]
Disclosure of other provisions [line items]
Balance as of January 1, 2023	366,863
Arising during the period	191,360
Unused provision reversed	0
Discount rate adjustment and unwinding of discount from the passage of time	47,880
Exchange effect	(3,670)
Balance as of December 31, 2023	$ 602,433

XML

Contents of Significant Accounts - Equity - Additional Information (Detail)			12 Months Ended
	Dec. 05, 2023 shares $ / shares	Dec. 05, 2022 shares $ / shares	Dec. 31, 2023 shares $ / shares	Dec. 31, 2022 shares $ / shares
Disclosure of classes of share capital [line items]
Shares authorized			26,000,000,000	26,000,000,000
Shares issued			12,529,822,000	12,504,749,000
Shares par value | $ / shares			$ 10	$ 10
Number of common shares represented by 1 ADS			5
Percentage of legal reserve			10.00%
Cash dividends | $ / shares				$ 3.60046348
American depositary shares [member]
Disclosure of classes of share capital [line items]
Number of American Depositary Shares traded on NYSE			121,000,000	135,000,000
Number of common shares represented by issued American Depositary Shares			607,000,000	674,000,000
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	27,000,000	23,000,000
Number of other equity instruments recalled and cancelled in share-based payment arrangement			2,000,000	2,000,000

XML

Contents of Significant Accounts - Summary of Stock Held by Associates (Detail) - shares shares in Thousands		Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Stock Held By Associates [Line Items]
Number of shares in entity held by its subsidiaries or associates		900,961	634,334
HSUN CHIEH [member]
Disclosure Of Stock Held By Associates [Line Items]
Number of shares in entity held by its subsidiaries or associates		441,371	441,371
YANN YUAN [member]
Disclosure Of Stock Held By Associates [Line Items]
Number of shares in entity held by its subsidiaries or associates		192,963	192,963
SUBTRON, the subsidiary of UNIMICRON [member]
Disclosure Of Stock Held By Associates [Line Items]
Number of shares in entity held by its subsidiaries or associates	[1]	47	0
SIS [member]
Disclosure Of Stock Held By Associates [Line Items]
Number of shares in entity held by its subsidiaries or associates	[2]	266,580	0

[1] Beginning from January 2023, SUBTRON becomes an associate of the Company.

[2] Beginning from August 2023, SIS becomes an associate of the Company.

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Contents of Significant Accounts - Details of Distribution (Detail) - TWD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of equity [Line Items]
Appropriation of earnings, Cash dividends	$ 45,017,096		$ 19,875,842
Cash dividends	$ 3	$ 3.6
Legal Reserve [Member]
Disclosure of equity [Line Items]
Appropriation of earnings	$ 6,255,736	$ 8,905,139
Special Reserve [member]
Disclosure of equity [Line Items]
Appropriation of earnings	(2,734,057)	(2,180,156)
Cash dividends [member]
Disclosure of equity [Line Items]
Appropriation of earnings, Cash dividends	$ 37,587,102	$ 45,017,096

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Contents of Significant Accounts - Non-controlling Interests (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Equity [abstract]
Beginning balance	$ 343,679		$ 223,181	$ 113,356
Impact of retroactive applications	0		(66,089)	0
Adjusted beginning balance	343,679		157,092	113,356
Net income (loss)	450,184	$ 14,702	819,960	(668,245)
Other comprehensive income (loss)	(14)		8	(19)
Share-based payment transactions	5,817		1,490	0
Changes in subsidiaries' ownership	456		(1,339)	(11,126)
Non-Controlling Interests	4,187		5,456	23,430
Derecognition of the non-controlling interests	(463,450)		(638,988)	765,785
Ending balance	$ 340,859	$ 11,132	$ 343,679	$ 223,181

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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
	Dec. 05, 2023 $ / shares shares	Dec. 05, 2022 $ / shares shares	May 27, 2022 shares	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	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2020
Restricted Stock Plan For Employees [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Compensation expenses | $											$ 1,025	$ 1,352	$ 1,520
Compensation plan description											UMC is authorized to issue restricted stocks in one tranche or in installments, under the custody of trust institution, within two years from the date of receiving the effective declaration from the competent authority.			UMC 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 declaration 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 UMC are gradually eligible to the vested restricted stocks at certain percentage and time frame.
Maximum shares to be issued under compensation plan | shares | shares			50					233
Shares of restricted stock for employees issued | shares | shares	27	23			1		200
Life of plan	4 years	4 years			4 years		4 years
Grant date quoted market price per share | $ / shares | $ / shares	$ 48.9	$ 44.4			$ 53		$ 21.8
Stock Appreciation Right Plan For Employees [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Compensation expenses | $											$ 105	210	$ 271
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											$ 207	$ 340
Unit of cash-settled stock appreciation right | Right									1	26

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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, 2023 yr $ / shares
Granted in September 2020 [Member]
Statement [Line Items]
Share price of measurement date (NT$/ per share) | $ / shares	$ 52.6
Expected volatility	23.95%
Expected life	0.67
Expected dividend yield	6.02%
Risk-free interest rate	1.06%
Granted in June 2021 [Member]
Statement [Line Items]
Share price of measurement date (NT$/ per share) | $ / shares	$ 52.6
Expected dividend yield	6.02%
Bottom of range [member] | Granted in June 2021 [Member]
Statement [Line Items]
Expected volatility	23.21%
Expected life	0.44
Risk-free interest rate	1.06%
Top of range [member] | Granted in June 2021 [Member]
Statement [Line Items]
Expected volatility	28.72%
Expected life	1.44
Risk-free interest rate	1.08%

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Contents of Significant Accounts - Summary of Disaggregation of Revenue by Geography (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	$ 222,533,000	$ 278,705,264	$ 213,011,018
Taiwan [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	68,360,231	105,213,451	92,427,670
China (includes Hong Kong) [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	27,545,452	39,641,613	26,949,205
Japan [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	11,612,866	17,053,279	13,445,127
Korea [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	30,872,198	25,689,385	17,548,763
USA [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	59,103,051	67,352,671	46,914,605
Europe [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	24,932,099	23,711,284	15,708,303
Others [member]
Disclosure of Geographical Areas [Line Items]
Revenue from contracts with customers	$ 107,103	$ 43,581	$ 17,345

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Contents of Significant Accounts - Summary of Disaggregation of Revenue by Product (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Products [Line Items]
Revenue from contracts with customers	$ 222,533,000	$ 278,705,264	$ 213,011,018
Wafer [member]
Disclosure Of Products [Line Items]
Revenue from contracts with customers	211,750,622	265,600,173	204,594,399
Other products [member]
Disclosure Of Products [Line Items]
Revenue from contracts with customers	$ 10,782,378	$ 13,105,091	$ 8,416,619

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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 222,533,000	$ 278,705,264	$ 213,011,018
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	220,283,306	276,175,120	211,074,982
Goods or services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 2,249,694	$ 2,530,144	$ 1,936,036

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Contents of Significant Accounts - Summary of Balances of Contract Assets and Contract Liabilities (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Jan. 01, 2022 TWD ($)
Disclosure of balances of contract assets and contract liabilities [line items]
Contract assets, current	$ 739,528		$ 373,318	$ 319,621
Contract liabilities, current	3,250,712	$ 106,163	3,546,815	3,441,754
Contract liabilities, non-current	430,640	$ 14,064	438,188	641,386
Contract liabilities	3,681,352		3,985,003	4,083,140
Sales of Goods and Services [member]
Disclosure of balances of contract assets and contract liabilities [line items]
Contract assets, current	1,132,477		766,691	677,326
Contract liabilities	3,681,352		3,985,003	4,083,140
Loss allowance [member]
Disclosure of balances of contract assets and contract liabilities [line items]
Contract assets, current	$ (392,949)		$ (393,373)	$ (357,705)

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Contents of Significant Accounts - Operating Revenues - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of additional information about revenue [Abstract]
Revenue that was included in contract liability balance at beginning of period	$ 2,871	$ 3,112
Transaction price allocated to unsatisfied performance obligations	195	223
Asset recognized from the cost to fulfill a contract with customer	$ 877	$ 721

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Contents of Significant Accounts - Operating Costs and Expenses (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Disclosure Of Operating Costs And Expenses [Line Items]
Salaries	$ 38,696,110		$ 44,003,174	$ 35,195,095
Labor and health insurance	2,060,096		1,840,591	1,641,494
Pension	1,700,656		1,913,828	1,658,923
Other employee benefit expenses	618,610		538,853	480,497
Depreciation	37,551,088		41,061,930	43,911,464
Amortization	2,726,481	$ 89,043	2,841,334	2,894,942
Operating costs [member]
Disclosure Of Operating Costs And Expenses [Line Items]
Salaries	26,693,905		30,074,528	23,388,888
Labor and health insurance	1,502,553		1,368,803	1,183,315
Pension	1,240,577		1,489,076	1,259,044
Other employee benefit expenses	421,871		373,739	335,829
Depreciation	36,006,021		39,305,321	42,002,745
Amortization	1,277,920		1,470,912	834,384
Operating expenses [member]
Disclosure Of Operating Costs And Expenses [Line Items]
Salaries	12,002,205		13,928,646	11,806,207
Labor and health insurance	557,543		471,788	458,179
Pension	460,079		424,752	399,879
Other employee benefit expenses	196,739		165,114	144,668
Depreciation	1,545,067		1,756,609	1,908,719
Amortization	$ 1,448,561		$ 1,370,422	$ 2,060,558

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Contents of Significant Accounts - Operating Costs and Expenses - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023
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, 2023	Dec. 31, 2022	Dec. 31, 2021
Analysis of income and expense [abstract]
Employees' compensation – Cash	$ 5,439,059	$ 9,160,485	$ 4,770,909
Directors' compensation	$ 45,000	$ 45,000	$ 25,264

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Contents of Significant Accounts - Net Other Operating Income and Expenses (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Analysis of income and expense [abstract]
Government grants	$ 3,862,001		$ 5,058,658	$ 5,269,412
Rental income from property, plant and equipment	202,082		192,833	187,166
Gain on disposal of property, plant and equipment	268,293	$ 8,762	482,983	143,735
Others	(330,050)		(394,827)	(373,482)
Total	$ 4,002,326	$ 130,709	$ 5,339,647	$ 5,226,831

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Contents of Significant Accounts - Non-Operating Income and Expenses (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
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	$ (40,553)		$ (1,247,962)	$ 2,892,470
Gain (Loss) on disposal of investments accounted for under the equity method	163,395		50,553	(16,388)
Others	100,254		62,869	(2,009,952)
Total other gains and losses	223,096	$ 7,286	(1,134,540)	866,130
Interest expenses, bonds payable	444,424		486,079	437,055
Interest expenses, bank loans	833,548		1,100,840	1,285,708
Interest expenses, lease liabilities	179,367		166,928	145,187
Interest expenses, others	16,390		31,464	139
Financial expenses	96,645		81,018	94,841
Total finance costs	$ 1,570,374	$ 51,286	$ 1,866,329	$ 1,962,930

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Contents of Significant Accounts - Components of Other Comprehensive Income (Loss) (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Statement of changes in equity [abstract]
Remeasurements of defined benefit pension plans, Arising during the period	$ 402,234	$ 13,136	$ 296,804	$ (197,477)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Arising during the period	5,530,359	180,612	(4,646,064)	5,811,342
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	1,610,116	52,584	(1,694,965)	2,959,130
Exchange differences on translation of foreign operations, Arising during the period	(2,386,278)		9,292,308	(4,743,299)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Arising during the period	(73,005)		91,442	(24,018)
Total other comprehensive income (loss), Arising during the period	5,083,426		3,339,525	3,805,678
Exchange differences on translation of foreign operations, Reclassification adjustments during the period	0		0	2,283
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	(1,413)		0	(394)
Total other comprehensive income (loss), Reclassification adjustments during the period	(1,413)		0	1,889
Remeasurements of defined benefit pension plans, Before tax	402,234	13,136	296,804	(197,477)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Before tax	5,530,359		(4,646,064)	5,811,342
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Before tax	1,610,116	52,584	(1,694,965)	2,959,130
Exchange differences on translation of foreign operations, Before tax	(2,386,278)	(77,932)	9,292,308	(4,741,016)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Before tax	(74,418)	(2,430)	91,442	(24,412)
Total other comprehensive income (loss), Before tax	5,082,013		3,339,525	3,807,567
Remeasurements of defined benefit pension plans, Income tax effect	(80,447)		(59,361)	39,495
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Income tax effect	(243,057)		(71,121)	(360,061)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Income tax effect	(90,891)		123,483	(96,510)
Exchange differences on translation of foreign operations, Income tax effect	386,660		883,238	23,175
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Income tax effect	3,768		(23,672)	6,763
Total other comprehensive income (loss), Income tax effect	(23,967)		852,567	(387,138)
Remeasurements of defined benefit pension plans, Net of tax	321,787		237,443	(157,982)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Net of tax	5,287,302		(4,717,185)	5,451,281
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Net of tax	1,519,225		(1,571,482)	2,862,620
Exchange differences on translation of foreign operations, Net of tax	(1,999,618)		10,175,546	(4,717,841)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Net of tax	(70,650)		67,770	(17,649)
Total other comprehensive income (loss)	$ 5,058,046	$ 165,188	$ 4,192,092	$ 3,420,429

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Contents of Significant Accounts - Major Components of Income Tax Expense (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Current income tax expense (benefit):
Current income tax charge	$ 6,426,598		$ 17,582,039	$ 7,088,975
Adjustments in respect of current income tax of prior periods	(217,891)		(585,941)	(150,260)
Deferred income tax expense (benefit):
Deferred income tax related to origination and reversal of temporary differences	2,239,309		2,276,015	407,280
Deferred income tax related to recognition and derecognition of tax losses and unused tax credits	0		60,178	723,270
Adjustment of prior year's deferred income tax	(120,230)		8,611	(130,841)
Deferred income tax arising from write-down or reversal of write-down of deferred tax assets	(16,516)		(14,007)	(20,172)
Income tax expense recorded in profit or loss	8,311,270	$ 271,433	19,326,895	7,918,252
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	(80,447)		(59,361)	39,495
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income	(243,057)		(71,121)	(360,061)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss	(90,891)		123,483	(96,510)
Income tax related to items that will not be reclassified subsequently to profit or loss	(414,395)	(13,533)	(6,999)	(417,076)
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	386,660		883,238	23,175
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss	3,768		(23,672)	6,763
Income tax related to items that may be reclassified subsequently to profit or loss	390,428	$ 12,751	859,566	29,938
Income tax charged directly to equity
Disposal of parent company's stock by subsidiary recognized as treasury stock transactions	0			(203)
Adjustments of changes in net assets of associates and joint ventures accounted for using equity method	(1,117)		(2,720)	22
Income tax charged directly to equity	$ (1,117)		$ (2,720)	$ (181)

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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, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Income before tax	$ 68,450,404	$ 2,235,480	$ 109,625,660	$ 58,496,432
At UMC's statutory income tax rate	13,690,081		21,925,132	11,699,286
Adjustments in respect of current income tax of prior periods	(217,891)		(585,941)	(150,260)
Net changes in loss carry-forward and investment tax credits	(2,179,234)		(465,152)	(845,267)
Adjustment of deferred tax assets/liabilities for write-downs/reversals and different jurisdictional tax rates	211,639		(281,319)	183,123
Tax effect of non-taxable income and non-deductible expenses:
Tax exempt income	(1,428,035)		(4,384,566)	(3,258,695)
Investment loss (gain)	(755,800)		1,827,822	(1,388,877)
Dividend income	(323,182)		(423,027)	(171,725)
Others	(145,520)		(340,745)	6,463
Basic tax	43,506		0	0
Estimated income tax on unappropriated earnings	(1,160,324)		1,247,910	1,558,031
Effect of different tax rates applicable to UMC and its subsidiaries	234,510		605,929	116,174
Taxes withheld in other jurisdictions	38,346		35,979	43,443
Others	303,174		164,873	126,556
Income tax expense recorded in profit or loss	$ 8,311,270	$ 271,433	$ 19,326,895	$ 7,918,252

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Contents of Significant Accounts - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	$ 5,130,411	$ 167,551	$ 5,226,236
Deferred income tax liabilities	(5,631,964)	$ (183,931)	(3,562,436)
Net deferred income tax assets (liabilities)	(501,553)		1,663,800	$ 3,154,352
Depreciation [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	2,396,554		2,056,568
Deferred income tax liabilities	(2,085,916)		(70,133)
Pension [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	436,129		569,193
Refund liabilities [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	306,408		138,617
Allowance for inventory valuation losses [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	682,909		507,621
Investment loss [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	314,427		474,405
Unrealized profit on intercompany sales [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	689,124		906,793
Others [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax assets	304,860		573,039
Deferred income tax liabilities	(374,109)		(544,863)
Investment gain [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax liabilities	(2,888,534)		(2,648,989)
Amortizable assets [member]
Disclosure Of Deferred Taxes [Line Items]
Deferred income tax liabilities	$ (283,405)		$ (298,451)

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Contents of Significant Accounts - Movement of Deferred Tax (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in deferred tax assets and liabilities [Line Items]
Beginning Balance	$ 1,663,800	$ 3,154,352
Amounts recognized in profit or loss during the period	(2,102,563)	(2,330,797)
Amounts recognized in other comprehensive income (loss)	(23,967)	852,567	$ (387,138)
Amounts recognized in equity	(1,117)	(2,720)
Exchange adjustments	(37,706)	(9,602)
Ending Balance	$ (501,553)	$ 1,663,800	$ 3,154,352

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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, 2023	Dec. 31, 2022
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	$ 37,523,694	$ 37,259,181
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	15,395,514	35,263,925
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	$ 22,128,180	$ 1,995,256

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Contents of Significant Accounts - Income Tax - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Taxable temporary differences of unrecognized deferred tax liabilities associated with investments in subsidiaries	$ 20,389	$ 21,658
Deductible temporary differences for which no deferred income tax assets have been recognized	$ 3,410	$ 3,001
USJC [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Effective tax rate	27.70%
Accounting profit	$ 3,408
UMC KOREA [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Effective tax rate	3.55%
Accounting profit	$ 2
UME BV [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Effective tax rate	20.12%
Accounting profit	$ 10

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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, 2023 TWD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 TWD ($) $ / shares shares	Dec. 31, 2021 TWD ($) $ / shares shares
Earnings per share-basic
Net income attributable to the parent company	$ 59,688,950	$ 1,949,345	$ 89,478,805	$ 51,246,425
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)	12,137,954	12,137,954	12,095,312	12,005,126
Earnings per share-basic (NTD) | (per share)	$ 4.92	$ 0.16	$ 7.4	$ 4.27
Earnings per share-diluted
Net income attributable to the parent company	$ 59,688,950	$ 1,949,345	$ 89,478,805	$ 51,246,425
Weighted-average number of ordinary shares for basic earnings per share (thousand shares)	12,137,954	12,137,954	12,095,312	12,005,126
Effect of dilution
Restricted stocks for employees	114,974	114,974	156,098	159,478
Employees' compensation	129,196	129,196	238,242	80,243
Weighted-average number of ordinary shares after dilution (thousand shares)	12,382,124	12,382,124	12,489,652	12,244,847
Earnings per share-diluted (NTD) | (per share)	$ 4.82	$ 0.16	$ 7.16	$ 4.19

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Contents of Significant Accounts - Reconciliation of Liabilities Arising from Financing Activities (Detail) - TWD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Short-term loans [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance		$ 0		$ 1,924,124		$ 11,057,132
Cash Flows		13,530,000		(1,965,684)		(8,974,216)
Non-cash changes,Foreign exchange		0		41,560		(158,792)
Non-cash changes,Others	[1]	0		0		0
Ending Balance		13,530,000		0		1,924,124
Long-term loans (current portion included) [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance		19,279,342		36,624,907		33,066,106
Cash Flows		3,857,704		(18,816,259)		4,088,537
Non-cash changes,Foreign exchange		(253,702)		1,470,694		(529,736)
Non-cash changes,Others	[1]	0				0
Ending Balance		22,883,344		19,279,342		36,624,907
Bonds payable (current portion included) [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance		28,184,687		40,536,658		18,690,384
Cash Flows		9,989,245		(13,305,050)		23,703,692
Non-cash changes,Foreign exchange		0
Non-cash changes,Others	[1],[2]	185,420		953,079		(1,857,418)
Ending Balance		38,359,352		28,184,687		40,536,658
Guarantee deposits (current portion included) [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance		30,757,001	[3]	14,369,769	[3]	235,992
Cash Flows		10,423,345		14,984,941		14,219,408
Non-cash changes,Foreign exchange		419,040		1,402,291		(85,631)
Non-cash changes,Others	[1]	0				0
Ending Balance	[3]	41,599,386		30,757,001		14,369,769
Lease liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance		5,737,095		5,068,754		5,576,864
Cash Flows		(666,439)		(712,854)		(699,680)
Non-cash changes,Foreign exchange		(24,106)		153,406		(144,419)
Non-cash changes,Others	[1]	346,637		1,227,789	[4]	335,989
Ending Balance		5,393,187		5,737,095		5,068,754
Other financial liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	[5]	21,449,487		20,966,209		20,746,624
Cash Flows	[5]	(21,209,443)
Non-cash changes,Foreign exchange	[5]	(330,783)		306,902		(163,387)
Non-cash changes,Others	[1],[5]	90,739		176,376		382,972
Ending Balance	[5]	$ 0		$ 21,449,487		$ 20,966,209

[1] Other non-cash changes mainly consisted of discount amortization measured by the effective interest method.

[2] Please refer to Note 6(13) for the Company’s exchangeable bonds.

[3] Guarantee deposits mainly consisted of deposits of capacity reservation.

[4] Mainly due to the increase in land lease.

[5] Please refer to Note 9(6) for more details on other financial liabilities.

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Significant Related Party Transactions - Significant Intercompany Transactions Between Consolidated Entities (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)
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	$ 61,923,652		$ 68,554,072		$ 48,440,369
Accounts receivable	$ 5,827,800		$ 9,502,922		$ 6,286,428
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 (XIAMEN) CO., LTD. (USCXM) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 1,127,275		$ 1,143,280		$ 1,222,320
Accounts receivable	$ 11,688		$ 16,774		$ 29,012
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
UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 364,948		$ 656,472		$ 178,331
Accounts receivable	$ 10,800		$ 6,734		$ 18,818
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
WAVETEK MICROELECTRONICS CORPORATION (WAVETEK) (WTK) [member] | UMC GROUP (USA) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 505,806		$ 716,357		$ 545,785
Accounts receivable	$ 53,916		$ 81,819		$ 126,580
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
WAVETEK MICROELECTRONICS CORPORATION (WAVETEK) (WTK) [member] | UMC [Member]
Disclosure of transactions between related parties [line items]
Sales			$ 124,178		$ 110,620
Explanation of terms and conditions of outstanding balances for related party transaction			Month-end 30 days	Month-end 30 days	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	$ 384,067		$ 551,913		$ 366,968
Accounts receivable	$ 43,863		$ 147,265		$ 60,147
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] | UDS [Member]
Disclosure of transactions between related parties [line items]
Sales	$ 159,523		$ 311,972
Accounts receivable	$ 2,696		$ 9,500
Explanation of terms and conditions of outstanding balances for related party transaction	Month-end 30 days	Month-end 30 days	Month-end 30 days	Month-end 30 days
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member] | UMC GROUP (USA) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 1,208,630		$ 1,565,670		$ 1,444,736
Accounts receivable	$ 17,816		$ 310,431		$ 221,375
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 (XIAMEN) CO., LTD. (USCXM) [member] | UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS) [member]
Disclosure of transactions between related parties [line items]
Sales	$ 286,087		$ 148,259
Accounts receivable	$ 362		$ 171
Explanation of terms and conditions of outstanding balances for related party transaction	Month-end 30 days	Month-end 30 days	Month-end 30 days	Month-end 30 days
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member] | UMC [Member]
Disclosure of transactions between related parties [line items]
Sales	$ 134,303		$ 1,035,407
Accounts receivable			$ 173
Explanation of terms and conditions of outstanding balances for related party transaction	Net 30 days - Net 45 days	Net 30 days - Net 45 days	Net 30 days - Net 45 days	Net 30 days - Net 45 days
UNITED SEMICONDUCTOR JAPAN CO., LTD. (USJC) [member]
Disclosure of transactions between related parties [line items]
Sales			$ 164,855
Accounts receivable			$ 151,430
Explanation of terms and conditions of outstanding balances for related party transaction			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	$ 3,487,292		$ 4,272,900		$ 2,917,993
Accounts receivable	$ 342,835		$ 744,082		$ 428,363
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

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Significant Related Party Transactions - Significant Transactions between Company and Other Related Parties (Detail) ¥ in Thousands, shares in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($) shares	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CNY (¥)
Disclosure of transactions between related parties [line items]
Accounts receivable-related parties, net	$ 347,964		$ 530,577		$ 11,364
Acquisition of financial assets at fair value through profit or loss – noncurrent, Purchase price	16,694,860		17,784,651		545,227
Acquisition of investments accounted for under the equity method, Purchase price	32,785,800		26,504,913		$ 1,070,731
Acquisition of intangible assets	2,546,516	$ 83,165	2,756,155	$ 1,924,924
Trading Capital Amount | ¥						¥ 4,416,624
Purchase price	21,209,443
FARADAY TECHNOLOGY CORP. [member]
Disclosure of transactions between related parties [line items]
Acquisition of investments accounted for under the equity method, Purchase price	1,990,073		1,862,245
Acquisition of intangible assets	323,551		266,053	181,254
ARTERY TECHNOLOGY CORPORATION, LTD. [member]
Disclosure of transactions between related parties [line items]
Accounts receivable-related parties, net	40,886		56,864
FARADAY TECHNOLOGY CORP. [member]
Disclosure of transactions between related parties [line items]
Accounts receivable-related parties, net	302,828		441,963
Associates [member]
Disclosure of transactions between related parties [line items]
Operating revenues	3,018,171		5,744,098	2,778,544
Refund liability, classified under other current liabilities	636		1,545
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
Associates [member] | Stock Of UNIMICRON [member]
Disclosure of transactions between related parties [line items]
Acquisition of investments accounted for under the equity method, Purchase price	$ 608,224
Acquisition of investments accounted for under the equity method, Trading Volume | shares	4,945	4,945
Other related party [member]
Disclosure of transactions between related parties [line items]
Operating revenues	$ 4,463		40,474	$ 38,797
Accounts receivable-related parties, net	0		1,052
Refund liability, classified under other current liabilities	0		7
Mask expenditure	2,375,225		2,581,409	1,861,438
Other payables of mask expenditure	751,763		812,185	560,042
All other related parties [member]
Disclosure of transactions between related parties [line items]
Operating revenues	3,022,634		5,784,572	$ 2,817,341
Refund liability, classified under other current liabilities	636		1,552
Others [member]
Disclosure of transactions between related parties [line items]
Accounts receivable-related parties, net	3,602		30,698
Other Associates [member]
Disclosure of transactions between related parties [line items]
Accounts receivable-related parties, net	648		$ 0
XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD. [member] | Increase of ownership stake in the subsidiary company USCXM [member]
Disclosure of transactions between related parties [line items]
Trading Capital Amount | ¥						3,741,862
Purchase price	17,945,970
FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP [member] | Increase of ownership stake in the subsidiary company USCXM [member]
Disclosure of transactions between related parties [line items]
Trading Capital Amount | ¥						¥ 674,762
Purchase price	$ 3,263,473

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Significant Related Party Transactions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023
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 30 days
Overseas [member] | Top of range [member]
Disclosure of transactions between related parties [line items]
Collection periods for accounts receivables	month-end 60 days

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Significant Related Party Transactions - Key Management Personnel Compensation (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of transactions between related parties [abstract]
Short-term employee benefits	$ 1,462,964	$ 2,047,118	$ 562,117
Post-employment benefits	2,732	2,782	2,322
Share-based payment	500,391	719,786	1,035,401
Others	618	649	578
Total	$ 1,966,705	$ 2,770,335	$ 1,600,418

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Assets Pledged as Collateral - Summary of Assets Pledged as Collateral (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 14,027,423	$ 21,909,250
Refundable deposits time deposit [member] | Customs [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 813,289	812,248
Purpose of pledge	Customs duty guarantee
Refundable deposits time deposit [member] | Science Park Bureau [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 236,556	236,587
Purpose of pledge	Collateral for land lease
Refundable deposits time deposit [member] | Science Park Bureau [member] | Dormitory Lease [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 18,647	29,371
Purpose of pledge	Collateral for dormitory lease
Refundable deposits time deposit [member] | National Property Administration, Ministry of Finance [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 64,950	64,950
Purpose of pledge	Guarantee for the application of national non-public use land for development
Refundable deposits time deposit [member] | Bureau of Land Administration, Tainan City Government [Member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 8,118	8,118
Purpose of pledge	Guarantee for the application of national non-public use land for development
Refundable deposits time deposit [member] | Liquefied Natural Gas Business Division, CPC Corporation, Taiwan [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 36,970	34,100
Purpose of pledge	Energy resources guarantee
Refundable deposits time deposit [member] | Bank of China and Agricultural Bank of China [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 1,006,852	1,043,840
Purpose of pledge	Bank performance guarantee
Refundable deposits time deposit [member] | CTBC Bank Singapore Branch [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 459,900	459,750
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	$ 4,487,730	4,828,597
Purpose of pledge	Collateral for long-term loans
Machinery and equipment [member] | Taiwan Cooperative Bank, Mega International Commercial Bank, KGI Bank, First Commercial Bank, Shanghai Commercial Bank, CTBC Bank and Secured Syndicated Loans from China Development Bank and 6 others [member]
Assets Pledged As Collateral [Line Items]
Assets pledged as collateral	$ 6,627,761	14,066,044
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	$ 0	592
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	$ 0	46,823
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	$ 266,650	$ 278,230
Purpose of pledge	Collateral for long-term loans

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Significant Contingencies and Unrecognized Contract Commitments - Additional Information (Detail) ¥ in Millions, $ in Millions, $ in Millions	Jan. 27, 2022 TWD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 CNY (¥)	Jul. 31, 2023 CNY (¥)	Jul. 31, 2023 USD ($)
Disclosure of contingent liabilities [line items]
Amounts available under unused letters of credit		$ 33,200
Litigations, electricity supply and customs tax guarantee		2,200
Patent license agreements and development contracts of intellectual property, contract amount		3,800
Royalties and development fees not yet recognized		1,200
Construction contracts, amount		70,600
Construction contracts not yet recognized		$ 38,400
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 | ¥			¥ 8,300
Repurchase from the other investors of their investments | ¥			¥ 4,900
Investments in subsidiaries by entity				¥ 4,120	$ 660
Additional Investment by entity subsidiary				740	$ 120
Cumulative investment in subsidiary by group | ¥				¥ 4,900

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Significant Subsequent Events - Additional Information (Detail) ¥ in Millions, $ in Millions, $ in Millions	Apr. 02, 2024 CNY (¥)	Mar. 22, 2024 TWD ($)	Apr. 30, 2024 USD ($)	Feb. 27, 2024 USD ($)
Purchase Of Interests In Associates [member] | FARADAY TECHNOLOGY CORP. [member]
Disclosure of subsidiaries [line items]
Purchase of interests in associates		$ 534
7V AI CAPITAL LLC [member] | Authorization to contribute additional capital to the subsidiary company [member] | Top of range [member] | UMC Capital Corp. [Member]
Disclosure of subsidiaries [line items]
The amount the parent company participate in the capital increase of a subsidiary			$ 22
7V AI CAPITAL LLC [member] | Authorization to contribute capital to the investee company [member] | Top of range [member] | UMC Capital Corp. [Member]
Disclosure of subsidiaries [line items]
The amount the Board of Directors of a subsidiary approved an investment in a company				$ 20
HEJIAN TECHNOLOGY (SUZHOU) CO., LTD [member] | Disposal of major subsidiary [member] | UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. [member]
Disclosure of subsidiaries [line items]
Disposal of ownership interest in the subsidiary percentage	100.00%
Consideration Receivable On Disposal Of Subsidiary | ¥	¥ 77

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Financial Risk and Fair Value Disclosures - Categories of Financial Instruments (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of detailed information about financial instruments [abstract]
Financial assets at fair value through profit or loss	$ 17,138,461		$ 18,490,569
Financial assets at fair value through other comprehensive income	17,683,960		15,189,600
Financial assets measured at amortized cost
Cash and cash equivalents (cash on hand excluded)	132,547,415		173,812,754
Receivables	32,292,914		38,783,086
Refundable deposits	2,708,823	$ 88,466	2,749,691
Other financial assets	6,353,768		869,308
Total	208,725,341		249,895,008
Financial liabilities at fair value through profit or loss	1,019,362		438,397
Financial liabilities measured at amortized cost
Short-term loans	13,530,000	$ 441,868	0
Payables	52,393,399		58,893,871
Guarantee deposits (current portion included)	41,599,386		30,757,001
Bonds payable (current portion included)	38,359,352		28,184,687
Long-term loans (current portion included)	22,883,344		19,279,342
Lease liabilities	5,393,187		5,737,095
Other financial liabilities	0		21,449,487
Total	$ 175,178,030		$ 164,739,880

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Financial Risk and Fair Value Disclosures - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Accounts receivables from the top ten customers	67.00%	56.00%
Profit or loss attributable to change in unrealized gains or losses for financial assets without quoted market prices held at end of period	$ (1,329)	$ (74)	$ 330
Profit or loss attributable to change in unrealized gains or losses for financial liabilities without quoted market prices held at end of period	(581)	829	(360)
Interest rate risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Increase (decrease) in profit due to percentage increase in market risk	36	19	39
Increase (decrease) in profit due to percentage decrease in market risk	$ (36)	$ (19)	$ (39)
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	$ 270	$ 285	$ 393
Percentage decrease in market risk	5.00%	5.00%	5.00%
Increase (decrease) in profit due to percentage decrease in market risk	$ (270)	$ (285)	$ (393)
Increase (decrease) in other comprehensive income due to percentage increase in market risk	722	579	867
Increase (decrease) in other comprehensive income due to percentage decrease in market risk	$ (722)	$ (579)	$ (867)
Taiwan, New Dollars [member] | 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	$ 620	$ 1,305	$ 1,104
Percentage decrease in market risk	10.00%	10.00%	10.00%
Increase (decrease) in profit due to percentage decrease in market risk	$ (620)	$ (1,305)	$ (1,104)
China, Yuan Renminbi [member] | 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	$ 582	$ 572	$ 375
Percentage decrease in market risk	10.00%	10.00%	10.00%
Increase (decrease) in profit due to percentage decrease in market risk	$ (582)	$ (572)	$ (375)
Japan, Yen [member] | 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	$ 290	$ 538	$ 434
Percentage decrease in market risk	10.00%	10.00%	10.00%
Increase (decrease) in profit due to percentage decrease in market risk	$ (290)	$ (538)	$ (434)
Financial assets at fair value through profit or loss, category [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Financial assets transfer from level two to level one	$ 655

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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, 2023	Dec. 31, 2022
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Short-term loans	$ 13,780,612
Payables	52,202,821	$ 58,767,584
Guarantee deposits	41,599,386	30,757,001
Bonds payable	40,232,586	23,809,420
Long-term loans	25,290,536	22,501,470
Lease liabilities	6,897,571	7,388,213
Other financial liabilities		21,541,642
Total	180,003,512	164,765,330
Not later than one year [member]
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Short-term loans	13,780,612
Payables	52,202,821	58,767,584
Guarantee deposits	1,476,430	238,416
Bonds payable	14,797,772	322,155
Long-term loans	2,872,168	3,246,153
Lease liabilities	649,879	658,092
Other financial liabilities		17,233,129
Total	85,779,682	80,465,529
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	0
Guarantee deposits	3,556,179	3,867,087
Bonds payable	10,980,506	8,742,481
Long-term loans	14,406,101	8,425,744
Lease liabilities	1,311,239	1,222,822
Other financial liabilities		4,308,513
Total	30,254,025	26,566,647
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	0
Guarantee deposits	25,955,654	169,419
Bonds payable	12,321,345	10,593,656
Long-term loans	5,071,743	7,798,280
Lease liabilities	1,223,724	1,207,385
Other financial liabilities		0
Total	44,572,466	19,768,740
Later than five years [member]
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]
Short-term loans	0
Payables	0	0
Guarantee deposits	10,611,123	26,482,079
Bonds payable	2,132,963	4,151,128
Long-term loans	2,940,524	3,031,293
Lease liabilities	3,712,729	4,299,914
Other financial liabilities		0
Total	$ 19,397,339	$ 37,964,414

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Financial Risk and Fair Value Disclosures - Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments and Contractual Maturity (Parenthetical) (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
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	$ 5,753	$ 3,213
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%

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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, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss, current	$ 443,601	$ 14,487	$ 705,918
Financial assets at fair value through profit or loss, noncurrent	16,694,860	545,227	17,784,651
Financial assets at fair value through other comprehensive income, current	5,753,379	187,896	3,213,057
Financial assets at fair value through other comprehensive income, noncurrent	11,930,581	389,634	11,976,543
Financial liabilities at fair value through profit or loss, current	1,019,362	$ 33,291	438,397
Level 1 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss, current	443,601		669,444
Financial assets at fair value through profit or loss, noncurrent	6,424,475		6,626,088
Financial assets at fair value through other comprehensive income, current	5,753,379		3,213,057
Financial assets at fair value through other comprehensive income, noncurrent	8,693,193		8,366,276
Financial liabilities at fair value through profit or loss, current	0		0
Level 2 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss, current	0		0
Financial assets at fair value through profit or loss, noncurrent	19,300		468,164
Financial assets at fair value through other comprehensive income, current	0		0
Financial assets at fair value through other comprehensive income, noncurrent	0		0
Financial liabilities at fair value through profit or loss, current	0		0
Level 3 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss, current	0		36,474
Financial assets at fair value through profit or loss, noncurrent	10,251,085		10,690,399
Financial assets at fair value through other comprehensive income, current	0		0
Financial assets at fair value through other comprehensive income, noncurrent	3,237,388		3,610,267
Financial liabilities at fair value through profit or loss, current	$ 1,019,362		$ 438,397

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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, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of fair value measurement of assets [line items]
Beginning balance	$ 524,645,583
Ending balance	546,576,832	$ 17,850,321	$ 524,645,583
Level 3 [member] | Financial assets at fair value through profit or loss [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	10,726,873		9,864,160
Recognized in profit (loss)	(1,216,735)		(13,041)
Recognized in other comprehensive income (loss)	0		0
Acquisition	1,353,205		1,303,056
Disposal	(117,737)		(546,783)
Return of capital	(37,730)		(26,672)
Transfer out of Level 3	(461,403)		(326,577)
Exchange effect	4,612		472,730
Ending balance	10,251,085		10,726,873
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	3,198,808		3,584,326
Recognized in profit (loss)	(312,149)		(150,786)
Recognized in other comprehensive income (loss)	0		0
Acquisition	610,153		192,258
Disposal	0		(186,579)
Return of capital	(1,384)		0
Transfer out of Level 3	(461,403)		(326,577)
Exchange effect	2,230		86,166
Ending balance	3,036,255		3,198,808
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	2,865,258		2,580,246
Recognized in profit (loss)	(277,994)		(328,602)
Recognized in other comprehensive income (loss)	0		0
Acquisition	294,046		485,256
Disposal	(89,997)		(15,782)
Return of capital	0		0
Transfer out of Level 3	0		0
Exchange effect	(4,679)		144,140
Ending balance	2,786,634		2,865,258
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	4,626,333		3,464,652
Recognized in profit (loss)	(617,764)		519,572
Recognized in other comprehensive income (loss)	0		0
Acquisition	294,245		625,542
Disposal	0		(194,572)
Return of capital	(36,346)		(26,672)
Transfer out of Level 3	0		0
Exchange effect	8,428		237,811
Ending balance	4,274,896		4,626,333
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	36,474		234,936
Recognized in profit (loss)	(8,828)		(53,225)
Recognized in other comprehensive income (loss)	0		0
Acquisition	0		0
Disposal	(27,740)		(149,850)
Return of capital	0		0
Transfer out of Level 3	0		0
Exchange effect	94		4,613
Ending balance	0		36,474
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Others [Member]
Disclosure of fair value measurement of assets [line items]
Recognized in profit (loss)	0
Recognized in other comprehensive income (loss)	0
Acquisition	154,761
Disposal	0
Return of capital	0
Transfer out of Level 3	0
Exchange effect	(1,461)
Ending balance	153,300
Level 3 [member] | Financial assets at fair value through other comprehensive income [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	3,610,267		2,503,462
Recognized in profit (loss)	0		0
Recognized in other comprehensive income (loss)	(372,879)		1,106,805
Acquisition	0		0
Disposal	0		0
Return of capital	0		0
Transfer out of Level 3	0		0
Exchange effect	0		0
Ending balance	3,237,388		3,610,267
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	3,427,720		2,351,603
Recognized in profit (loss)	0		0
Recognized in other comprehensive income (loss)	(365,395)		1,076,117
Acquisition	0		0
Disposal	0		0
Return of capital	0		0
Transfer out of Level 3	0		0
Exchange effect	0		0
Ending balance	3,062,325		3,427,720
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	182,547		151,859
Recognized in profit (loss)	0		0
Recognized in other comprehensive income (loss)	(7,484)		30,688
Acquisition	0		0
Disposal	0		0
Return of capital	0		0
Transfer out of Level 3	0		0
Exchange effect	0		0
Ending balance	$ 175,063		$ 182,547

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Financial Risk and Fair Value Disclosures - Reconciliation for Fair Value Measurement in Level 3 Derivatives Financial Liabilities (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of fair value measurement of liabilities [line items]
Beginning balance	$ 201,834,635
Ending balance	202,859,864	$ 6,625,077	$ 201,834,635
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	438,397		2,380,599
Recognized in profit (loss)	580,965		(1,433,405)
Derecognition			(508,797)
Ending balance	$ 1,019,362		$ 438,397

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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, 2023	Dec. 31, 2022
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	27.70%	36.46%
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%

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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, 2023	Dec. 31, 2022
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%	5.00%
Percentage of increase in volatility	5.00%	5.00%
Increase (decrease) in profit or loss due to percentage decrease in volatility	$ 131	$ 67
Increase (decrease) in profit or loss due to percentage increase in volatility	$ (119)	$ (77)
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	$ (214)	$ (248)
Increase (decrease) in other comprehensive income due to percentage decrease in the discount for lack of marketability	214	248
Increase (decrease) in profit or loss due to percentage increase in the discount for lack of marketability	(261)	(273)
Increase (decrease) in profit or loss due to percentage decrease in the discount for lack of marketability	$ 199	$ 198

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) - TWD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	$ 38,359,352	$ 28,184,687
Long-term loans (current portion included)	22,883,344	19,279,342
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)	38,367,168	28,346,985
Long-term loans (current portion included)	22,883,344	19,279,342
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)	32,827,211	22,916,330
Long-term loans (current portion included)	0	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)	5,539,957	5,430,655
Long-term loans (current portion included)	22,883,344	19,279,342
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	0
Long-term loans (current portion included)	$ 0	$ 0

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Operating Segment Information - Geographic Non-current Assets Information (Detail) - TWD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Disclosure of Geographical Areas [Line Items]
Non-current assets	$ 260,306,236	$ 207,863,887
Taiwan [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	158,066,796	130,812,383
Singapore [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	55,322,448	29,080,766
China (includes Hong Kong) [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	33,424,815	37,213,538
Japan [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	13,415,669	10,736,562
Others [member]
Disclosure of Geographical Areas [Line Items]
Non-current assets	$ 76,508	$ 20,638

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Operating Segment Information - Individual Customers Accounting for at least 10% of Operating Revenues (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Disclosure of Major Customers [Line Items]
Operating revenues	$ 222,533,000	$ 7,267,570	$ 278,705,264	$ 213,011,018
Customer concentration risk [member] | Wafer fabrication [member] | Customer A [member]
Disclosure of Major Customers [Line Items]
Operating revenues	16,615,745		24,061,849	21,935,208
Customer concentration risk [member] | Wafer fabrication [member] | Customer B [member]
Disclosure of Major Customers [Line Items]
Operating revenues	$ 29,242,973		$ 22,226,167	$ 14,707,370

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Capital Management - Debt to Capital Ratios (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)
Disclosure Of Capital Management [Abstract]
Total liabilities	$ 202,859,864	$ 6,625,077	$ 201,834,635
Less: Cash and cash equivalents	(132,553,615)	(4,328,988)	(173,818,777)	$ (5,676,642)	$ (132,622,131)	$ (94,048,036)
Net debt	70,306,249		28,015,858
Total equity	343,716,968	$ 11,225,244	322,810,948		$ 264,375,047	$ 223,139,562
Total capital	$ 414,023,217		$ 350,826,806
Debt to capital ratios	16.98%	16.98%	7.99%	7.99%