10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

☒ 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

Commission file number: 000-51026

Monolithic Power Systems, Inc.

(Exact name of registrant as specified in its charter)

Delaware	77-0466789
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

5808 Lake Washington Blvd. NE, Kirkland, Washington 98033

(Address of principal executive offices)(Zip Code)

(425) 296-9956

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock, par value $0.001 per share	MPWR	The NASDAQ Global Select Market

Securities registered pursuant to Section 12(g) of the Act: None

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

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. 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  ☐

1

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 such files).     Yes  ☒  No  ☐

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

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

If an emerging growth company, 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. ☐

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 whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). ☐ Yes   ☒ No

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant, based upon the closing price of the common stock on the Nasdaq Global Select Market on June 30, 2023, was $16.4 billion.*

There were 48,661,000 shares of the registrant’s common stock issued and outstanding as of February 22, 2024.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Proxy Statement for the 2024 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2023.

* Excludes 17,279,000 shares of the registrant’s common stock held by executive officers, directors and stockholders whose ownership exceeds 5% (“affiliates”) of the common stock outstanding at June 30, 2023. Exclusion of such shares should not be construed to indicate that any such person possesses the power, direct or indirect, to direct or cause the direction of the management or policies of the registrant or that such person is controlled by or under common control with the registrant. 

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MONOLITHIC POWER SYSTEMS, INC.

FORM 10-K

FOR THE FISCAL YEAR ENDED December 31, 2023

TABLE OF CONTENTS

		Page
PART I
Item 1.	Business	5
	Information about Executive Officers	10
Item 1A.	Risk Factors	11
Item 1B.	Unresolved Staff Comments	30
Item 1C.	Cybersecurity	30
Item 2.	Properties	31
Item 3.	Legal Proceedings	31
Item 4.	Mine Safety Disclosures	31
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	32
Item 6.	[Reserved]	34
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	34
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	40
Item 8.	Financial Statements and Supplementary Data	41
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	73
Item 9A.	Controls and Procedures	73
Item 9B.	Other Information	73
Item 9C.	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	73
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	74
Item 11.	Executive Compensation	74
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	74
Item 13.	Certain Relationships and Related Transactions, and Director Independence	74
Item 14.	Principal Accountant Fees and Services	74
PART IV
Item 15.	Exhibits and Financial Statement Schedules	75
Item 16.	Form 10-K Summary	77
	Signatures	78

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FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, that have been made pursuant to and in reliance on the provisions of the Private Securities Litigation Reform Act of 1995. These statements include, among others, statements concerning:
 

• the above-average industry growth of product and market areas that we have targeted;

• our plan to increase our revenue through the introduction of new products within our existing product families as well as in new product categories and families;

• our mission statement to reduce energy and material consumption to improve all aspects of quality of life and create a sustainable future;

• the effects of macroeconomic factors, including the 2023 banking crisis, the global economic downturn, the Russia-Ukraine conflict and the Middle East conflict on the semiconductor industry and our business;

• the effect that liquidity of our investments has on our capital resources;

• the continuing application of our products in the storage and computing, enterprise data, automotive, industrial, communications and consumer markets;

• estimates of our future liquidity requirements;

• the cyclical nature of the semiconductor industry;

• our belief that we may incur significant legal expenses that vary with the level of activity in each of our current or future legal proceedings;

• expectations regarding protection of our proprietary technology;

• business outlook for 2024 and beyond;

• the factors that we believe will impact our business, operations and financial condition, as well as our ability to achieve revenue growth;

• the expected percentage of our total revenue from various end markets;

• our ability to identify, acquire and integrate companies, businesses and products, and achieve the anticipated benefits from such acquisitions and integrations;

• the expected impact of various tax laws and regulations on our income tax provision, financial position and cash flows;

• our plan to repatriate cash from our subsidiary in Bermuda;

• our intention and ability to continue our stock repurchase program and pay cash dividends and dividend equivalents; 

• the factors that differentiate us from our competitors; and

• our ability to adequately remediate our material weakness.

In some cases, words such as “would,” “could,” “may,” “should,” “predict,” “potential,” “targets,” “continue,” “anticipate,” “expect,” “intend,” “plan,” “believe,” “seek,” “estimate,” “project,” “forecast,” “will,” the negative of these terms or other variations of such terms and similar expressions relating to the future identify forward-looking statements. All forward-looking statements are based on our current outlook, expectations, estimates, projections, beliefs and plans or objectives about our business, our industry and the global economy, including our expectations regarding the potential impacts of macroeconomic factors, such as the 2023 banking crisis, the global economic downturn, the Russia-Ukraine conflict and the Middle East conflict on the semiconductor industry and our business. These statements are not guarantees of future performance and are subject to significant risks and uncertainties. Actual events or results could differ materially and adversely from those expressed in any such forward-looking statements. Risks and uncertainties that could cause actual results to differ materially include those set forth throughout this Annual Report on Form 10-K including, in particular, in the section entitled “Item 1A. Risk Factors.” Except as required by law, we disclaim any duty, and undertake no obligation, to update any forward-looking statements, whether as a result of new information relating to existing conditions, future events or otherwise or to release publicly the results of any future revisions we may make to forward-looking statements to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events. Readers are cautioned not to place undue reliance on such statements, which speak only as of the date of this Annual Report on Form 10-K and entail significant risks. Readers should carefully review future reports and documents that we file from time to time with the Securities and Exchange Commission (the “SEC”), such as our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and any Current Reports on Form 8-K. 

Except as the context otherwise requires, the terms “Monolithic Power Systems,” “MPS,” “Registrant,” “Company,” “we,” “us,” or “our” as used herein are references to Monolithic Power Systems, Inc. and its consolidated subsidiaries.

4

PART I

Item 1. Business

General

Monolithic Power Systems, Inc. (“MPS”) is a fabless global company that provides high-performance, semiconductor-based power electronics solutions. Incorporated in 1997, our three core strengths include deep system-level knowledge, strong semiconductor design expertise, and innovative proprietary technologies in the areas of semiconductor processes, system integration, and packaging. These combined advantages enable us to deliver reliable, compact, and monolithic solutions found in storage and computing, enterprise data, automotive, industrial, communications and consumer applications. Our mission is to reduce energy and material consumption to improve all aspects of quality of life and create a sustainable future. We believe that we differentiate ourselves by offering solutions that are more highly integrated, smaller in size, more energy-efficient, more accurate with respect to performance specifications and, consequently, more cost-effective than many competing solutions. We plan to continue to introduce new products within our existing product families, as well as in new innovative product categories.

Our principal executive office is located in Kirkland, Washington. We have over 3,500 employees worldwide, with locations in Asia (primarily in China, India, Japan, Singapore, South Korea and Taiwan), Europe (primarily in France, Germany, Hungary, Italy, Portugal, Spain, Switzerland and the United Kingdom) and the United States.

Industry Overview

Semiconductors comprise the basic building blocks of electronic systems and equipment. Within the semiconductor industry, components can be classified either as discrete devices, such as individual transistors or integrated circuits (“ICs”), in which a number of transistors and other elements are combined to form a more complicated electronic circuit. ICs can be further divided into three primary categories: digital, analog, and mixed-signal. Digital ICs, such as memory devices and microprocessors, can store or perform arithmetic functions on data that is represented by a series of ones and zeroes. Analog ICs, in contrast, handle real world signals such as temperature, pressure, light, sound, or speed. In addition, analog ICs also perform power management functions, such as regulating or converting voltages, for electronic devices. Mixed-signal ICs combine digital and analog functions onto a single chip and play an important role in bridging real world to digital systems.

Analog and Mixed-Signal Markets. We focus on the market for high performance analog and mixed-signal ICs. High performance products generally are differentiated by functionality and performance factors, which include integration of higher levels of functionality onto a single chip, greater precision, better power efficiency and density, higher speed and lower heat and noise. There are several key factors that distinguish the analog and mixed-signal IC markets from digital IC markets. These factors include longer product life cycles, numerous market segments, technology that is difficult to replicate, relative complexity of design and process technologies, importance of experienced design engineers, lower capital requirements and diversity of end markets. We have targeted product and market areas that we believe have the ability to offer above-average growth over the long term compared to the semiconductor industry as a whole.

End Markets and Applications

We design and develop our products for the storage and computing, enterprise data, automotive, industrial, communications and consumer markets, with the storage and computing market representing the largest portion of our revenue in 2023. The following table is a summary of the various end market applications for our products, and those markets’ contribution as a percentage of our total revenue:

		Percentage of Total Revenue
End Markets	Applications	2023			2022			2021
Storage and computing	Storage applications, commercial notebooks, and graphics cards		27.0	%		25.3	%		21.2	%
Automotive	Advanced driver assistance systems, infotainment, digital cockpit, USB connectors, body electronics, and lighting applications		21.7	%		16.7	%		16.9	%
Enterprise Data	Cloud-based CPU server applications, and server artificial intelligence (“AI”) applications		17.7	%		14.0	%		9.6	%
Consumer	Home appliances, gaming, smart TVs, lighting, monitors, and stereos		12.9	%		17.8	%		23.4	%
Communications	4G and 5G infrastructure, satellite communications, and other wireless applications		11.3	%		14.0	%		13.6	%
Industrial	Power sources, industrial meter, security applications, and other industrial equipment		9.4	%		12.2	%		15.3	%

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Product Families

Our proprietary process and packaging technologies enable us to design and deliver smaller, single-chip power management ICs. These technologies simplify the design process and are applicable across a wide range of analog applications within the storage and computing, enterprise data, automotive, industrial, communications and consumer markets. Our product families are differentiated from those of our competitors with respect to their high degree of integration and strong levels of accuracy, power efficiency, quality and longevity, making them cost-effective and more sustainable relative to many competing solutions. Our key product families include the following:

Direct Current (“DC”) to DC Products. DC to DC ICs are used to convert and control voltages within a broad range of electronic systems, such as cloud-based CPU servers, server AI applications, storage applications, commercial notebooks, digital cockpit, power sources, home appliances, 4G and 5G infrastructure and satellite communications applications. We believe that our DC to DC products are differentiated in the market, particularly with respect to their high degree of integration, high voltage operation, high load current, high switching speed, small footprint, and high energy efficiency. These features are important to our customers as they are designed to result in fewer components that need to be produced and consumed, a smaller form factor, more accurate regulation of voltages, lower power consumption and, ultimately, lower system cost, increased reliability and lower carbon emissions through the elimination of many discrete components and power devices. The DC to DC product family accounted for 94% of our total revenue in 2023 and 95% of our total revenue in both 2022 and 2021.

Lighting Control Products. Lighting control ICs are used in backlighting and general illumination products. Lighting control ICs for backlighting are used in systems that provide the light source for LCD panels typically found in computers and notebooks, monitors, car navigation systems and televisions. Backlighting solutions are typically either white light emitting diode lighting sources or cold cathode fluorescent lamps. The Lighting Control product family accounted for 6% of our total revenue in 2023 and 5% of our total revenue in both 2022 and 2021.

In the future, we plan to continue to introduce new products within our existing product families, as well as in new innovative product categories. Our ability to achieve revenue growth will depend in part upon our ability to continue to innovate while fulfilling our customers’ evolving needs, enter new market segments, obtain design wins, grow our sales to customers in regions outside China, Taiwan and other Asian markets, expand our customer base and continue to secure manufacturing capacity.

Customers, Sales and Marketing

We have sales offices in China, India, Japan, Singapore, South Korea, Taiwan, the United States and throughout Europe. Our products typically require a highly technical sales and applications engineering effort where we assist our customers in the design and use of our products in their application. We maintain a staff of applications engineers who work directly with our customers’ engineers in the development of their systems’ electronics containing our products.

Once we secure our product positioning through our technical sales and applications engineers’ efforts, we then sell our products through third-party distributors, value-added resellers and directly to original equipment manufacturers (“OEMs”), original design manufacturers (“ODMs”), electronic manufacturing service (“EMS”) providers and other end customers. Our third-party distributors are subject to distribution agreements with us, which allow the distributors to sell our products to end customers and other resellers, including OEMs, ODMs or EMS providers. Our value-added resellers may second source our products and provide other services to customers. ODMs typically design and manufacture electronic products on behalf of OEMs, and EMS providers typically provide manufacturing services for OEMs and other electronic product suppliers.

In 2023, our three largest distributors accounted for 26%, 19% and 10% of our total revenue. In 2022, our two largest distributors accounted for 24% and 19% of our total revenue. In 2021, our three largest distributors accounted for 26%, 15% and 10% of our total revenue. No other distributors or end customers accounted for more than 10% of our full-year, total revenue in any of the periods presented.

Current distribution agreements with several of our major distributors provide that each distributor has the non-exclusive right to sell and shall use its best efforts to promote and develop a market for our products. These agreements provide that payment for purchases from us will generally occur within 30 to 90 days from the date of invoice. In addition, we allow for limited stock rotation in certain agreements.

Because our sales are primarily billed and payable in United States dollars, our sales are generally not subject to fluctuating currency exchange rates. However, because a majority of our revenue is attributable to sales to customers in Asia, changes in the relative value of the dollar may create pricing pressures for our products. In 2023, 2022 and 2021, our revenue from sales to customers in Asia was 87%, 86% and 90%, respectively.

Our sales are made primarily pursuant to standard individual purchase orders. Our backlog consists of orders that we have received from customers which have not yet shipped. Because orders in backlog are subject to cancellation or postponement, and backlog at any particular date is not necessarily representative of actual sales for any succeeding period, we believe that our backlog is not necessarily a reliable indicator of future revenue. 

Typical supply chain lead times for orders are generally 16 to 26 weeks. We often build inventory in advance based on our forecast of future customer orders. This subjects us to certain risks, most notably the possibility that sales will not meet our forecast, which could lead to inventories in excess of demand. If excess inventory exists, it may be necessary for us to sell it at a substantial discount, take a significant write-down or dispose of it altogether, all of which would negatively affect our profit margins. In addition, in response to market conditions, we may slow the rate of manufacturing our products, which could result in insufficient inventory levels and reduced sales if we underestimate the demand for our products.

6

Research and Development

We have assembled a qualified team of engineers primarily in China, the United States, Taiwan, Spain, Switzerland, Hungary, Portugal and Germany with core competencies in analog and mixed-signal design. Through our research and development efforts, we have developed a collection of intellectual property and know-how that we are able to leverage across our products and markets. These include the development of high efficiency power devices, the design of precision analog circuits and systems, expertise in mixed-signal design, and integration and the development of proprietary semiconductor process technologies.

Our research and development efforts are generally targeted at three areas: systems architecture, circuit design and implementation, and process technologies. In the area of systems architecture, we are exploring new ways of solving our customers’ system design challenges and are investing in the development of systems expertise in new markets and applications that align well with our core capabilities. In the area of circuit design and implementation, our initiatives include expanding our portfolio of products and adding new features to our products. In the area of process technologies, we are investing in research and development resources to provide leading-edge analog power processes for our next generation of ICs. We believe process technologies are key strategic components to our future growth. 

Our growth is fueled by our customers’ need for our power-efficient solutions. Consequently, we focus on continually improving the energy efficiency of our products in our research and development efforts in all three targeted areas. Our products are principally positioned to achieve lower power loss and enable significant reductions in circuit board space by shrinking or eliminating many passive components that are otherwise needed by competitors’ offerings. In addition, the life cycles of our products are typically over 10 years, reducing the manufacturing needs and associated carbon emissions associated with the production of replacement products.

Patents and Intellectual Property Matters

We rely on our proprietary technologies, which include both our proprietary circuit designs for our products and our proprietary manufacturing process technologies. Our future success and competitive position depend in part upon our ability to obtain and maintain protection of our proprietary technologies.

In general, we have elected to pursue patent protection for aspects of our circuit and device designs that we believe are patentable and to protect our manufacturing process technologies by maintaining those process technologies as trade secrets. As of December 31, 2023, we had 1,701 patents/applications issued or pending, of which 585 patents have been issued in the United States. Our issued patents are scheduled to expire at various times through December 2043. Our patents are material to our business, but we do not rely on any one particular patent for our success. We also rely on a combination of nondisclosure agreements and other contractual provisions, as well as our employees’ commitment to confidentiality and loyalty, to protect our technology, know-how and processes. We also seek to register certain of our trademarks as we deem appropriate. We have not registered any of our copyrights and do not believe registration of copyrights is material to our business. Despite precautions that we take, it may be possible for unauthorized third parties to copy aspects of our current or future technology or products or to obtain and use information that we regard as proprietary. There can be no assurance that the steps we take are adequate to protect our proprietary rights, that our patent applications will lead to issued patents, that others will not develop or patent similar or superior products or technologies, or that our patents will not be challenged, invalidated or circumvented by others. Furthermore, the laws of the countries in which our products are or may be developed, manufactured or sold may not protect our products and intellectual property rights to the same extent as laws in the United States. Our failure to adequately protect our proprietary technologies could materially harm our business.

The semiconductor industry is characterized by frequent claims of infringement and litigation regarding patent and other intellectual property rights. Patent infringement is an ongoing risk, in part because other companies in our industry could have patent rights that may not be identifiable when we initiate development efforts. Litigation may be necessary to enforce our intellectual property rights, and we may have to defend ourselves against infringement claims. Such litigation can be very costly and may divert our management resources. Further, we have agreed to indemnify certain of our customers and suppliers in some circumstances against liability from infringement by our products. In the event any third party were to make an infringement claim against us or our customers, we could be enjoined from selling selected products, could be required to indemnify our customers or suppliers, or could pay royalties or other damages to third parties. If any of our products are found to infringe and we are unable to obtain necessary licenses or other rights on acceptable terms, we would either have to change our product so that it does not infringe or stop making the infringing product, which could have a material adverse effect on our operating results, financial condition and cash flows.

7

Manufacturing

We utilize a fabless business model, working with third parties to manufacture and assemble our ICs. This fabless approach allows us to focus our engineering and design resources on our strengths and to reduce our fixed costs and capital expenditures. In contrast to many fabless semiconductor companies, which utilize standard process technologies and design rules established by their foundry partners, we have developed our own proprietary process and packaging technologies and collaborate with our foundry partners to install our technologies on their equipment in their facilities for use on our behalf. This close collaboration and control over the manufacturing process has historically resulted in favorable yields and product performance for our ICs.

We currently contract with several suppliers to manufacture our wafers in foundries located in China, Taiwan, South Korea and Singapore. Once our silicon wafers have been produced, they are shipped to the facilities in China, Taiwan, and Singapore that we and our partners utilize for wafer sort, which is a testing process performed to identify non-functioning dies. Our semiconductor products are then assembled and packaged by independent subcontractors in China, Taiwan and Malaysia. The assembled ICs are then sent for final testing to the facilities in China, Taiwan and Malaysia that we and our partners utilize prior to shipping to our customers.
 
The manufacturing facilities we utilize in Asia enable us to benefit from shorter manufacturing cycle times and lower labor and overhead costs. We have expanded our product testing capabilities in these facilities and are able to take advantage of the rich pool of local engineering talent to expand our manufacturing support and engineering operations.

Competition

The analog and mixed-signal semiconductor industry is highly competitive, and we expect competitive pressures to continue. Our ability to compete effectively and to expand our business will depend on our ability to continue to recruit both applications engineering and design engineering personnel, our ability to introduce new products, and our ability to maintain the rate at which we introduce these new products, and our ability to meet our and customers’ energy efficiency goals. Our industry is characterized by decreasing average selling prices over the life of a product. We compete with domestic and international semiconductor companies, many of which have substantially greater financial and other resources with which to pursue engineering, manufacturing, marketing, and distribution of their products and, in some cases, have a broader number of product offerings that may enable them to more effectively market and sell to customers and engage sales partners. We are in direct and active competition, with respect to one or more of our product lines, with several manufacturers of such products, of varying size and financial strength. We consider our primary competitors to include Analog Devices, Infineon Technologies, NXP Semiconductors, ON Semiconductor, Power Integrations, Renesas Electronics, ROHM Semiconductor, Semtech, STMicroelectronics and Texas Instruments.

We expect continued competition from existing competitors as well as competition from new entrants into the semiconductor market. We believe that we are competitive in the markets in which we sell and on the basis of key competitive factors in our industry, particularly because our ICs typically are smaller in size, are highly integrated with lower energy consumption, possess higher levels of power management functionalities and achieve high performance specifications at lower price points than most of our competitors. However, there is no assurance that our products will continue to compete favorably or that we will be successful in the face of increasing competition from new products and enhancements introduced by existing competitors or new companies entering our markets. In addition, there has recently been a high level of consolidation in the semiconductor industry. If these or future acquisitions are successful, competition may intensify and our competitors may have additional resources to compete against us.

We operate in the cyclical semiconductor industry. While we are subject to industry downturns, we have targeted product and market areas that we believe have the ability to offer above average industry performance over the long term.

Historically, our revenue has generally been higher in the second half of the year than in the first half although various factors, such as market conditions and the timing of key product introductions, could impact this trend.

Government Regulations

We are subject to international, federal and local legislation, regulations, and other requirements relating to the discharge of substances into the environment; the treatment, transport, and disposal of hazardous wastes; recycling and product packaging; worker health and safety; and other activities affecting the environment, our workforce, and the management of our manufacturing operations. We believe that our operations and facilities comply in all material respects with applicable environmental laws and worker health and safety laws.

We are also subject to import/export controls, tariffs, and other trade-related regulations and restrictions in the countries in which we have operations or otherwise do business. Government regulations and import/export controls can be complex and are subject to change in the future, and accordingly, we are unable to assess the possible effect of compliance with future requirements. Our efforts to comply with these government regulations could have material impacts on our capital expenditures and operating expenses, revenue, resource allocation, operations, competitive position, or financial condition, though the magnitude and duration of such impacts are uncertain and difficult to quantify. Refer to “Item 1A. Risk Factors” for further discussion of material risks related to government policies and regulations on environmental laws, international trade policies and restrictions, including tariffs on imports of foreign goods and regulations restricting the export of goods and services between the U.S. and China.

8

Human Capital Management

Our performance is substantially dependent on the performance of our executive officers and key employees. Due to the relative complexity of the design of our analog and mixed-signal ICs, our engineers generally have many years of experience and greater circuit design aptitude. Analog engineers with advanced skills are limited in number and difficult to replace. The loss of the services of key officers, managers, engineers and other technical personnel would materially harm our business. Our future success depends, in part, on our ability to attract, train, retain, and motivate highly qualified technical and managerial personnel, and there can be no assurance we will be successful.
 
As of December 31, 2023, we employed 3,564 employees primarily in Asia, Europe, South America and the United States, compared with 3,247 employees as of December 31, 2022. Certain employees are subject to collective bargaining agreements and we believe that we have good relations with these employees. We have never experienced an employee-based work stoppage or strike.

We strive to maintain a culture that encourages innovation and create a workplace that values diverse backgrounds, a healthy and safe environment, and professional growth opportunities.
 

• We continue to recruit new talent from a diverse candidate pool through various university recruitment programs and employment websites targeting underrepresented groups. We provide unconscious bias training to promote an environment of inclusivity. We do not tolerate discrimination of any kind and have adopted policies for reporting concerns or violations.

• We are an equal-opportunity employer, and we make employment decisions based on merit and business needs. Our total compensation packages are competitive, fair, and structured to encourage employees to invest in our future.

• We provide employees with access to various learning tools and resources to explore their interests and develop their business skills and knowledge.

• We have occupational health and safety management systems and environmental management plans in place. They include our standards for chemical and hazardous waste management, rules on use of personal protective equipment, and safety training plans. Our largest testing facilities in Chengdu, China are ISO 14001 and ISO 45001 certified.

• We support the well-being of our employees. In certain offices, we offer onsite flu shot clinics and other annual health checkups and workshops. Our largest facilities have amenities including fitness centers, sports courts and private rooms for nursing. We also offer free exercise classes, strength training and yoga in some of our offices.

9

Available Information

Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports that are filed or furnished pursuant to Sections 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, are available free of charge. They may be obtained from our website at www.monolithicpower.com under “Investor Relations” as soon as reasonably practicable after we electronically file such documents with, or furnish them to, the SEC, or at the SEC website at www.sec.gov. We also make available on our website the charters for our audit committee, compensation committee, and nominating and corporate governance committee, our code of ethics, our director voting policy and our code of social responsibility. In addition, we will disclose on our website any amendments to, or waivers from, our code of ethics. We also disclose on our website our report on environment, social responsibility and governance. Information contained on our website is not a part of this Annual Report on Form 10-K.

Information About Executive Officers

Information regarding our executive officers as of February 29, 2024 is as follows:

Name	Age	Position
Michael Hsing	64	President, Chief Executive Officer and Director
Bernie Blegen	66	Executive Vice President and Chief Financial Officer
Deming Xiao	61	Executive Vice President and President of Asia Operations
Maurice Sciammas	64	Executive Vice President and Senior Vice President of Worldwide Sales and Marketing
Saria Tseng	53	Executive Vice President, Strategic Corporate Development, General Counsel and Corporate Secretary

Michael Hsing has served as the chairman of our Board of Directors and has served as our President and Chief Executive Officer since founding MPS in August 1997. Prior to founding MPS, Mr. Hsing was a Senior Silicon Technology Developer at several analog IC companies, where he developed and patented key technologies, which set new standards in the power electronics industry. Mr. Hsing is an inventor on numerous patents related to the process development of bipolar mixed-signal semiconductor manufacturing. Mr. Hsing holds a B.S.E.E. from the University of Florida.

Bernie Blegen has served as our Chief Financial Officer since July 2016 and is responsible for finance, accounting, tax, treasury and investor relations. From August 2011 to June 2016, Mr. Blegen served as our Corporate Controller. Prior to joining MPS, Mr. Blegen held a number of executive finance and accounting positions for other publicly traded technology companies, including Xilinx, Inc. and Credence Systems. Mr. Blegen holds a B.A. from the University of California, Santa Barbara.

Deming Xiao has served as our President of Asia Operations since January 2008. Since joining us in May 2001, Mr. Xiao has held several executive positions, including Foundry Manager and Senior Vice President of Operations. Before joining MPS, from June 2000 to May 2001, Mr. Xiao was Engineering Account Manager at Chartered Semiconductor Manufacturing, Inc. Prior to that, Mr. Xiao spent six years as Manager of Process Integration Engineering at Fairchild Imaging Sensors. Mr. Xiao holds a B.S. in Semiconductor Physics from Sichuan University, Chengdu, China and an M.S.E.E. from Wayne State University.

Maurice Sciammas has served as our Senior Vice President of Worldwide Sales and Marketing since 2007. Mr. Sciammas joined MPS in July 1999 and served as Vice President of Products and Vice President of Sales (excluding greater China) until he was appointed to his current position. Before joining MPS, he was Director of IC Products at Supertex from 1990 to 1999. He has also held positions at Micrel, Inc. He holds a B.S.E.E. degree from San Jose State University.

Saria Tseng has served as our Vice President, General Counsel and Corporate Secretary since 2004 and additionally as our Vice President, Strategic Corporate Development since 2009. Ms. Tseng joined the Company from MaXXan Systems, Inc., where she was Vice President and General Counsel from 2001 to 2004. Previously, Ms. Tseng was an attorney at Gray Cary Ware & Freidenrich, LLP and Jones, Day, Reavis & Pogue. Ms. Tseng is a member of the state bar in both California and New York and is a member of the bar association of the Republic of China (Taiwan). Ms. Tseng holds Master of Laws degrees from the University of California at Berkeley and the Chinese Culture University in Taipei.

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Item 1A. Risk Factors

Our business involves numerous risks and uncertainties, including but not limited to the material risks described below. This section should be read in conjunction with all of the other information in this Annual Report on Form 10-K and our other filings with the SEC. If any of these risks materialize from time to time, then our business, reputation, financial condition, operating results, and growth prospects could be materially and adversely affected. In such an event, the trading price of our common stock could decline, and you could lose all or part of your investment in our common stock. Additional risks, trends and uncertainties may arise that could also harm our business, reputation, financial condition, operating results, and growth prospects.
 

Our past financial performance should not be considered to be a reliable indicator of future performance, and investors should not use historical trends to anticipate results or trends in future periods. These risks involve forward-looking statements and our actual results may differ substantially from those discussed in these forward-looking statements.

Risk Factors Summary

The following summary description sets forth an overview of the material risks we are exposed to in the normal course of our business activities. The summary does not purport to be complete and is qualified in its entirety by reference to the full risk factor discussion immediately following this summary description. We encourage you to read the full risk factor discussion carefully.
 
Our revenue and expenses are difficult to predict, have varied significantly in the past, and could fluctuate significantly in the future due to numerous risks and uncertainties, many of which are beyond our control. As a result, we may not be profitable on a quarterly or annual basis. Our business, results of operations and financial condition, as well as your investment in our common stock, could be materially and adversely affected by any of the following material risks:

• our dependence on the markets in Asia for our customer base, which may expose us to political, cultural, regulatory, economic, foreign currency and operational risks;

• changes in general economic conditions in the countries where our products are sold or used, particularly those in China;

• the impact of extensive Chinese government regulations, reduction or elimination of incentives, and uncertainties with respect to China’s legal system, on us and our manufacturing partners and suppliers;

• changes in international trade policy, such as tariffs on imports of foreign goods and regulations restricting the export of goods and services, between the U.S. and China;

• political and other risks in Taiwan and Hong Kong due to their tense relationships with China;

• fluctuations in the value of the U.S. Dollar relative to other currencies, including the Renminbi;

• our reliance on key suppliers in China, which may expose us to political, cultural, regulatory, economic, foreign currency, operational and capacity shortage risks;

• our ability to achieve growth rates or financial performance comparable to past years;

• changes in general demand for electronic products in the end markets that we serve;

• our ability to accurately forecast sales and expenses due to the nature of our business as a component supplier;

• our ability to timely develop and introduce new products, and the acceptance of our new products in the marketplace;

• our dependency on a limited number of customers, including distributors and value-added resellers, for a significant portion of our revenue;

• potential product liability risks due to defects or failures to meet specifications;

• lengthy sales cycles for our products balanced against the fixed nature of a substantial portion of our expenses;

• availability of adequate manufacturing capacity from our suppliers, and our ability to increase product sales in spite of capacity issues;

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• increases in unanticipated costs as a result of increasing manufacturing capacity;

• our dependency on third-party suppliers for wafer purchases and potential increases in prices for wafers due to general capacity shortages;

• our ability to deliver products on a timely basis despite disruptions in our relationships with assembly and test subcontractors;

• our ability to manage our inventory levels, including the levels of inventory held by our distributors;

• increases in manufacturing costs due to commodity price increases;

• the highly cyclical nature of the semiconductor industry, and increased competition due to industry consolidation;

• competition from companies with greater financial and technological resources, and customers developing products internally;

• the impact of system upgrades, cyberattacks or other system security, data protection and privacy breaches on our business operations;

• the impact of various U.S. and international laws and regulations regarding data protection on our business operations;

• our significant investment of resources in research and development that may not result in increased future sales;

• our ability to realize the anticipated benefits of any business acquisitions and other strategic investments;

• the impact of new tax laws on our tax provision and tax planning;

• risks in connection with our internal control over financial reporting and the identified material weakness;

• our failure to comply with various governmental laws and regulations related to environmental, social and governance (“ESG”) initiatives or our failure to meet our own ESG goals and targets;

• our ability to successfully defend ourselves in legal proceedings and protect our intellectual property, and the significant increase in legal expenses as a result of such proceedings;

• the loss of key personnel;

• risks associated with owning our stock, including volatility in our trading price due to our business and financial performance, analyst downgrades, failure to meet our own or analyst expectations, changes to our stock repurchase or dividend program, and dilution from issuance of additional shares;

• health risks, climate crises and other natural disasters; and

• financial market, economy and geopolitical uncertainties.

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Risks Associated with Our Significant Operations in Asia, Particularly in China

We derive most of our revenue from direct or indirect sales to customers in Asia and have significant operations in Asia, which may expose us to political, cultural, regulatory, economic, foreign exchange, and operational risks. 

We derive most of our revenue from customers located in Asia through direct sales or indirect sales under distribution arrangements and value-added reseller agreements with parties located in Asia. As a result, we are subject to significant risks due to this geographic concentration of business and operations. For the year ended December 31, 2023, 87% of our revenue was from customers in Asia. There are risks inherent in doing business in Asia, and internationally in general, including:

• changes in, or impositions of, legislative or regulatory requirements or restrictions, including tax and trade laws in the U.S. and in the countries in which we manufacture or sell our products, and governmental action to restrict our ability to sell to foreign customers where sales of products may require export licenses;

• trade restrictions imposed by the U.S. related to goods imported from regions in China with records of forced labor and other human rights issues;

• currency exchange rate fluctuations impacting intercompany transactions;

• fluctuations in the value of the U.S. Dollar relative to other foreign currencies, which could affect the competitiveness of our products;

• transportation delays and other supply chain issues;

• changes in tax regulations in China that may impact our tax status in Chengdu, Hangzhou and other regions where we have significant operations; 

• multi-tiered distribution channels that may diminish visibility to end customer pricing and purchase patterns;

• international political relationships and acts or threats of war;

• terrorism and threats of terrorism;

• adverse weather conditions or other natural disasters that may cause work stoppages and affect our operations in China;

• work stoppages related to employee dissatisfaction;

• economic, social and political instability;

• longer accounts receivable collection cycles;

• enforcing contracts generally; and

• less effective protection of intellectual property and contractual arrangements.

If we fail to expand our customer base and significantly reduce the geographic concentration of our customers, we will continue to be subject to the foregoing risks, which could materially and adversely affect our business, financial condition and results of operations.

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Our business has been and may be significantly impacted by worldwide economic conditions, in particular changing economic conditions in China.

Our operations and performance depend significantly on global economic conditions. Adverse macroeconomic conditions, including inflation, slowing growth, recession, stagflation, new or increased tariffs and other barriers to trade, tighter credit, higher interest rates, currency fluctuations, higher unemployment, labor shortages, lower capital expenditures by businesses, and lower consumer confidence and spending, have in the past, and could in the future, have a material adverse effect on logistics, demand for our products, and our product and operational costs. For example, due to economic uncertainties in 2023, some of our customers cancelled, decreased or delayed their existing and future orders with us, which impacted our financial results and made our forecasting much more difficult. In addition, volatility in the credit markets could severely diminish our customers’ liquidity and capital availability, which could materially harm our business.
 
Demand for our products is a function of the health of the economies in the U.S., Europe, China and the rest of Asia. We cannot predict the timing, strength or duration of any economic disruptions, such as those resulting from the global economic downturn, the Russia-Ukraine conflict, the Middle East conflict or subsequent economic recovery worldwide, in our industry, or in the different markets that we serve. We also may not accurately assess the impact of changing market and economic conditions on our business and operations. These and other economic factors could have a material adverse effect on demand for our products and on our financial condition and operating results.
 
In particular, since we have significant operations in China, our business development plans, results of operations and financial condition may be materially and adversely affected by significant political, social and economic developments in China. The current stagnation in China’s economy has adversely impacted, and could further adversely impact our customers, prospective customers, suppliers, distributors and partners in China, which could have a material adverse effect on our operating results and financial condition. 

There are inherent risks associated with the operation of our manufacturing and testing facilities in China, which could increase product costs or cause a delay in product shipments.

We have manufacturing and testing facilities in China. We face the following risks, among others, with respect to our operations in China:

• challenges to hire and maintain a qualified workforce;

• natural disasters such as earthquakes, flooding, severe heatwaves or droughts, which could result in power shortages or water restrictions in our facilities;

• challenges to maintain appropriate and acceptable manufacturing controls; and

• higher than anticipated overhead and other operational costs.

If we are unable to maintain our facilities in China at full operational status with qualified workers, appropriate manufacturing controls and reasonable cost levels, we may incur costs higher than our current expense levels, which would affect our gross margins and operating expenses. In addition, if capacity restraints result in significant delays in product shipments, our business and results of operations would be materially and adversely affected.

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We and many of our manufacturing partners and suppliers are subject to extensive Chinese government regulations, and the benefit of various incentives from Chinese governments that we and many of our manufacturing partners and suppliers receive may be reduced or eliminated, which could increase our costs or limit our ability to sell products and conduct activities in China. 

The Chinese government has broad discretion and authority to regulate the technology industry in China. Additionally, the Chinese government has implemented policies from time to time to regulate economic activities in China. It exercises significant control over China’s economy through the allocation of resources, controlling payment of foreign currency-denominated obligations, setting monetary policy and providing preferential treatment to particular industries or companies.
 
Any additional regulations or the amendment of previously implemented regulations could require us and our manufacturing partners and suppliers to change our business plans, increase our costs, or limit our ability to sell products and conduct business activities in China, which could materially and adversely affect our business and operating results.
 
The Chinese government and provincial and local governments have also provided, and may continue to provide, various incentives to encourage the development of the semiconductor industry in China. Such incentives include cash awards, tax rebates, reduced tax rates, favorable lending policies and other measures, some or all of which may be available to our manufacturing partners, suppliers and us. Any of these incentives could be reduced or eliminated by governmental authorities at any time, which could materially and adversely affect our business and operating results.

Uncertainties with respect to China’s legal system, including uncertainties regarding the enforcement of laws, and sudden or unexpected changes in policies, laws and regulations in China could materially and adversely affect our operations.

China’s legal system is a civil law system based on written statutes. Unlike the common law system, prior court decisions under the civil law system may be cited for reference but have limited precedential value. Since China’s legal system continues to rapidly evolve, the interpretations and enforcement of these laws and regulations are not always uniform and involve uncertainties. In addition, any new or amended laws and regulations related to, among other things, foreign investments and manufacturing could have a material adverse effect on our business and our ability to operate business in China.
 
From time to time, we may have to resort to administrative and court proceedings to enforce our legal rights. Any administrative and court proceedings in China may be protracted, resulting in substantial costs and diversion of resources and management attention. Since China’s administrative and court authorities have significant discretion in interpreting and implementing statutory provisions and contractual terms, it may be more difficult to evaluate the outcome of administrative and court proceedings and the level of legal protection than those that may be provided in other jurisdictions. These uncertainties may impede our ability to enforce contracts in China and could materially and adversely affect our business and results of operations.
 
Furthermore, China’s legal system is based in part on government policies and internal rules, some of which are not published on a timely basis, or at all, and may have retroactive effects. As a result, we may not be aware of our violation of any of these policies and rules until some time after the violation may have occurred. Such unpredictability towards our contractual, property and procedural rights and any failure to quickly respond to changes in the regulatory environment in China could materially and adversely affect our business and impede our ability to continue our operations and proceed with our business plans in China.

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We are subject to export laws, trade policies and restrictions including international tariffs that could materially and adversely affect our business and results of operations.

We are subject to U.S. laws and regulations that could limit and restrict the export of some of our products and services and may restrict our transactions with certain customers, business partners and other individuals, including, in certain cases, dealings with or between our employees and subsidiaries. In certain circumstances, export controls and economic sanctions may prohibit the export of certain products, services and technologies, and in other circumstances we may be required to obtain an export license before exporting the controlled item. Compliance with these laws and regulations has not materially limited our operations or our sales, but could in the future, which would materially and adversely affect our business and results of operations. We maintain an export compliance program, but our compliance controls could be circumvented, exposing us to legal liabilities, sanctions and restrictions on our business. We must also comply with export restrictions and laws imposed by other countries affecting trade and investments. Although these restrictions and laws have not materially restricted our operations in the past, they could do so in the future, which would materially and adversely affect our business and results of operations. In addition, U.S. laws and regulations and sanctions, or threat of sanctions, that could limit or restrict the export of some of our products and services may also encourage our customers to develop their own solutions to replace our products, or seek to obtain a greater supply of similar or substitute products from our competitors that are not subject to these restrictions, which could materially and adversely affect our business, financial condition and results of operations. Furthermore, our customers’ end products and systems that incorporate our components could be subject to export laws, trade policies and other sales restrictions, which could indirectly affect our business, financial conditions and results of operations. For example, the increasing focus on the risks and strategic importance of AI technologies has resulted in regulatory restrictions that target products and services capable of enabling or facilitating AI, and may in the future result in additional restrictions impacting the sales of AI technologies or products. Any of such regulatory restrictions could, in turn, impact the sales of our products supporting AI applications.
 
There has been increasing rhetoric, in some cases coupled with legislative or executive action, from several U.S. and foreign leaders regarding tariffs against foreign imports of certain materials. More specifically, there have been several rounds of U.S. tariffs on Chinese goods that have taken effect in the past few years, some of which prompted retaliatory Chinese tariffs on U.S. goods. The institution of trade tariffs both globally and between the U.S. and China specifically carries the risk of negatively affecting both countries’ overall economic condition, as well as our business and financial results. If these tariffs continue or additional tariffs are imposed in the future, they could have a negative impact on us as we have significant operations in China and the U.S.
 
Additionally, the imposition of tariffs is dependent upon the classification of goods under the U.S. Harmonized Tariff System (“HTS”) and the country of origin of the goods. Determination of the HTS and the origin of the goods is a technical matter that can be subjective in nature. Accordingly, although we believe our classifications of both HTS and origin are appropriate, there is no certainty that our assessment will be consistent with that of the U.S. government. If the U.S. government does not agree with our determinations, we could be required to pay additional amounts, including potential penalties.

We face political and other risks conducting business in Taiwan and Hong Kong, particularly due to their tense relationships with China.

We have significant business operations in Taiwan, and many of our manufacturing partners and suppliers are located in Taiwan. Accordingly, our business, financial condition and results of operations may be affected by changes in governmental and economic policies in Taiwan, social instability and diplomatic and social developments in or affecting Taiwan due to its unique international political status. Although Taiwan and China have significant economic and cultural relations, we cannot assure that relations between Taiwan and China will not face political, military or economic challenges or actions in the future. Any deterioration in the relations between Taiwan and China, and other factors affecting military, political or economic conditions in Taiwan, could disrupt our business operations and materially and adversely affect our results of operations.
 
In addition, the Chinese government has promulgated new regulations impacting economic and political stability within Hong Kong where many of our customers are located. Due to the sensitive political climate these regulations created, there are increasing risks that this China’s national security law may trigger sanctions or other forms of restrictions by foreign governments including the U.S., which could affect companies conducting business in Hong Kong. It is difficult for us to predict the impact, if any, the implementation of the national security law will have on our business, as such impact will depend on future developments, which are highly uncertain and cannot be predicted.

Fluctuations in the value of the U.S. Dollar relative to other foreign currencies, including the Renminbi, may adversely affect our results of operations.

Many of our manufacturing and other suppliers are and will continue to be primarily located in China for the foreseeable future. In connection with the global economic downturn, there has been an increased level of global currency fluctuation and volatility. If the value of the Renminbi rises against the U.S. Dollar, there could be an increase in our manufacturing costs relative to competitors who have manufacturing facilities located outside China, which could adversely affect our financial results and operations. In addition, our sales are primarily denominated in the U.S. Dollar. If the value of the U.S. Dollar rises against other currencies, it may adversely affect the demand for our products in international markets, which could negatively and materially impact our business and results of operations.
 
We incur foreign currency exchange gains or losses related to certain transactions, including intercompany transactions between the U.S. and our foreign subsidiaries, that are denominated in currencies other than the functional currencies. Fluctuations in the value of the U.S. Dollar relative to foreign currencies could increase the amount of foreign currency exchange losses we record, which could have an adverse and material impact on our results of operations.

A significant portion of our manufacturing capacity comes from suppliers in China, which exposes us to political, cultural, regulatory, economic, foreign exchange, and operational risks.

A significant portion of our manufacturing, assembly and packaging capacity comes from key suppliers located in China. As a result, we are subject to significant political, regulatory, economic, foreign exchange, and operational risks due to this geographic concentration in our business. Although our management has an established long-term strategy to diversify capacity outside China, there is no guarantee that we will be able to identify, qualify and engage additional foundry partners and assembly and packaging suppliers in other regions in order to mitigate these risks, or that the quality, price or terms of such production will be sufficient or acceptable to us, any of which could negatively and materially harm our business and results of operations.

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Risks Associated with Product Demand and Sales

We may not achieve growth rates or financial performance comparable to past years. 

In the past, our revenue increased significantly in certain years due to increased sales of certain of our products. We are subject to numerous risks and factors that could cause a decrease in our growth rates, or a decline in revenue compared to past periods, including increased competition, loss of certain of our customers, unfavorable changes in our operations, reduced global electronics demand, a deterioration in market conditions including as a result of the global economic downturn, end-customer market downturn, market acceptance and penetration of our current and future products, and litigation. A decrease in our growth rates, or a decline in revenue, could materially and adversely affect our business and results of operations.

If demand for our products declines in the major end markets that we serve, our revenue will decrease and our results of operations and financial condition would be materially and adversely affected.

We believe that the application of our products in the storage and computing, enterprise data, automotive, industrial, communication and consumer markets will continue to account for the majority of our revenue. If we are not able to accurately predict new end markets to serve or if the demand for our products declines in certain of our current major end markets, our revenue would decrease compared to prior year periods and our results of operations and financial condition would be materially and adversely affected. In addition, as technology evolves, the requirement to integrate the functionalities of various components, including our discrete semiconductor products, onto a single chip and/or onto other components of systems containing our products increases. Should our customers require integrated solutions that we do not offer, demand for our products could decrease, and our business, financial condition and results of operations would be materially and adversely affected.

Due to the nature of our business as a component supplier, we may have difficulty both in accurately predicting our future revenue and appropriately managing our expenses.

Because we provide components for end products and systems, demand for our products is influenced by our customers’ end product demand. As a result, we may have difficulty in accurately forecasting our revenue and expenses. Our expenses and revenue depend on the timing, size, and speed of commercial introductions of end products and systems that incorporate our products, all of which are inherently difficult to forecast, as well as the ongoing demand for previously introduced end products and systems. In addition, demand for our products is influenced by our customers’ ability to manage their inventory. Our sales to distributors are also subject to higher volatility because they service demand from multiple levels of the supply chain which, in itself, is inherently difficult to forecast. All of these factors continue to be exacerbated by the adverse effects of macroeconomic factors, including inflation, increased interest rates, supply chain disruptions, decreased economic output, fluctuations in currency rates, the Russia-Ukraine conflict and the Middle East conflict. If our customers, including distributors, reduce their orders from us, do not manage their inventory correctly or misjudge their customers’ demand, our shipments to and orders from our customers may vary significantly or decline on a quarterly basis, and we may have difficulty forecasting our expenses and inventory levels, which could reduce our revenue, result in inventory write offs, and adversely affect our financial condition and results of operations.

We may be unsuccessful in developing and selling new products with margins similar to, or better than, what we have experienced in the past, which could impact our overall gross margin and financial performance.

Our success depends on our development and sale of products that are differentiated in the market, with gross margins that have historically been above industry averages. Should we fail to improve or maintain our gross margins in the future, and accordingly develop and introduce sufficiently differentiated products that result in higher gross margins than industry averages, our business, financial condition and results of operations could be materially and adversely affected.

We may be unsuccessful in developing and selling new products or in penetrating new markets required to maintain or expand our business. 
 
Our competitiveness and future success depend on our ability to design, develop, manufacture, assemble, test, market, and support new products and enhancements on a timely and cost-effective basis. A fundamental shift in technologies in any of our product markets could have a material adverse effect on our competitive position within these markets. Our failure to timely develop new technologies or to react quickly to changes in existing technologies could materially delay our development of new products, which could result in product obsolescence, decreased revenue, and/or a loss of market share to competitors.
 
As we develop new product lines, we must adapt to market conditions that may be unfamiliar to us, such as competitors and distribution channels that are different from those we have known in the past. Some of our new product lines require us to re-equip our labs to test parameters we have not tested in the past. If we are unable to adapt rapidly to these new conditions, we may not be able to successfully penetrate new markets.
 
The success of a new product depends on accurate forecasts of long-term market demand and future technological developments, as well as on a variety of other factors, including:

• timely and efficient completion of process design and device structure improvements;

• timely and efficient implementation of manufacturing, assembly, and test processes;

• the ability to secure and effectively utilize fabrication capacity in different geometries;

• product performance;

• product availability and pricing;

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• product quality and reliability; and

• effective marketing, sales and services.

To the extent that we fail to timely introduce new products or to quickly penetrate new markets, our business, financial condition and results of operations could be materially and adversely affected.

We receive a significant portion of our revenue from distribution arrangements and value-added resellers, and the loss of any one of these distributors, value-added resellers or direct customers, or failure to collect a receivable from them could materially and adversely affect our financial position and results of operations.

We market our products through distribution arrangements and value-added resellers, and through our direct sales to customers that include OEMs, ODMs and EMS providers. Receivables from our customers are generally not secured by any type of collateral and are subject to the risk of being uncollectible. Significant deterioration in the liquidity or financial condition of any such major customers or any group of our customers could have a material adverse impact on the collectability of our accounts receivable and our future financial condition and operating results. While we could partner with other distributors or value-added resellers to replace any of our customers, the change in business partners could interrupt our operations, cause us to have to identify and qualify new partners, and have a materially adverse impact on our business, financial condition and results of operations.
 
Moreover, we believe a high percentage of our products are eventually sold to a number of OEMs and ODMs. Although we communicate with OEMs and/or ODMs in an attempt to achieve “design wins,” which are decisions by OEMs and/or ODMs to incorporate our products, we do not have purchase commitments from these end users. Therefore, there can be no assurance that the OEMs and/or ODMs will continue to incorporate our ICs into their products, even if we secure a design win. OEM technical specifications and requirements can change rapidly, and we may not have products that fit new specifications from an end customer for whom we have had previous design wins. We cannot be certain that we will continue to achieve design wins from large OEMs, that our customers will continue to be successful in selling to the OEMs, or that the OEMs will be successful in selling products which incorporate our ICs. The loss of any significant customer, any material reduction in orders by any of our significant customers or by their OEM customers, the cancellation of a significant customer order, or the cancellation or delay of a customer’s or an OEM’s significant program or product could reduce our revenue and adversely affect our financial condition and results of operations.

Our products must meet specifications, and undetected defects and failures may occur, which may cause customers to return or stop buying our products and may expose us to product liability risk.

Our customers generally establish demanding specifications for quality, performance, energy efficiency and reliability that our products must meet. ICs as complex as ours often encounter development delays and may contain undetected defects or failures when first introduced or after commencement of commercial shipments, which might require product replacement or recall. Further, our third-party manufacturing processes or changes thereto, or changes in the materials used in the manufacturing processes may cause our products to fail. From time to time, we have experienced product quality, performance or reliability problems. Our standard warranty period is generally one or two years, which exposes us to significant risks of claims for defects and failures. If defects and failures occur in our products, we could experience a loss of customers and/or a decrease in revenue, increased costs, including warranty expense and costs associated with customer support, cancellations or rescheduling of orders or shipments, and product returns or discounts, any of which would harm our operating results.
 
In addition, product liability claims may be asserted by our customers. Although we currently have insurance, there can be no assurance that we have obtained sufficient insurance coverage or that asserted claims will be within the scope of coverage. Our insurance providers could deny or challenge these claims, and as a result, reimbursement to us is not guaranteed or could be delayed. If coverage is denied, we may not have sufficient resources to pay for these claims. Furthermore, we may experience a significant increase in premiums and therefore decide to self-insure, which may not meet the expectations or requirements of certain customers. All of these factors could have a material and adverse impact on our business, financial condition and results of operations.

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Because of the lengthy sales cycles for our products and the fixed nature of a significant portion of our expenses, we may incur substantial expenses before we earn associated revenue and may not ultimately achieve our forecasted sales for our products.

The introduction of new products presents significant business challenges because product development plans and expenditures may be made up to two years or more in advance of any sales. It generally takes us up to 12 months or more to design and manufacture a new product prototype. Only after we have a prototype do we introduce the product to the market and begin selling efforts in an attempt to achieve design wins. This sales process requires us to expend significant sales and marketing resources without any assurance of success. Volume production of products that use our ICs, if any, may not be achieved for an additional period of time after an initial sale. Sales cycles for our products are lengthy for a number of reasons, including: 

• our customers usually complete an in-depth technical evaluation of our products before they place a purchase order;

• the commercial adoption of our products by OEMs and ODMs is typically limited during the initial release of their product to evaluate product performance and consumer demand;

• our products must be designed into our customers’ products or systems; and

• the development and commercial introduction of our customers’ products incorporating new technologies are frequently delayed.

As a result of our lengthy sales cycles, we may incur substantial expenses before we earn associated revenue because a significant portion of our operating expenses is relatively fixed and based on expected revenue. The lengthy sales cycles of our products also make forecasting the volume and timing of orders difficult. In addition, the delays inherent in lengthy sales cycles raise additional risks that customers may cancel or change their orders, particularly as such customers are exposed to economic risks in connection with the global economic downturn. Our sales are made by purchase orders. Because industry practice allows customers to reschedule or cancel orders on relatively short notice, backlog is not always a good indicator of our future sales. If customer cancellations or purchase order changes occur, we could lose anticipated sales and not have sufficient time to reduce our inventory and operating expenses.
 

Risks Associated with Supply and Manufacturing

Our ability to increase product sales and revenue may be constrained by the manufacturing capacity of our suppliers.

Although we provide our suppliers with rolling forecasts of our production requirements, their ability to provide wafers to us is limited by the available capacity, particularly capacity in the geometries we require, at the facilities in which they manufacture wafers for us. As a result, this lack of capacity has at times constrained our product sales and revenue growth. In addition, an increased need for capacity to meet internal demands or demands of other customers could cause our suppliers to reduce capacity available to us. Our suppliers may also require us to pay amounts in excess of contracted or anticipated amounts for wafer deliveries or require us to make other concessions in order to acquire the wafer supply necessary to meet our customer requirements. If our suppliers extend lead times, limit supplies or the types of capacity we require, or increase prices due to capacity constraints or other factors, our revenue and gross margin may materially decline. In addition, if we experience supply delays or limitations, our customers may reduce their purchase levels with us and/or seek alternative solutions to meet their demand, which could materially and adversely impact our business and results of operations. 

There may be unanticipated costs associated with increasing our third-party suppliers’ manufacturing capacity.

We anticipate that future growth of our business will require increased manufacturing capacity on the part of third-party supply foundries, assembly shops, and testing facilities for our products. In order to facilitate such growth, we may need to enter into strategic transactions, investments and other activities, with both our current suppliers and new suppliers. Such activities are subject to a number of risks, including:

• the costs and expense associated with such activities, including requirements to make long-term purchase commitments including upfront cash deposits to our suppliers;

• the availability of modern foundries to be developed, acquired, leased or otherwise made available to us or our third-party suppliers;

• the ability of foundries and our third-party suppliers to obtain the advanced equipment used in the production of our products;

• delays in identifying and negotiating agreements with new foundries and suppliers; and

• environmental, engineering or manufacturing qualification problems relating to existing or new foundry facilities, including delays in qualification of new foundries by our customers.

These and other risks may affect the ultimate cost and timing of any expansion of our third-party supplier capacity. If our manufacturing costs increase, including as a result of inflationary pressure, or we experience supply constraints, we may be required to raise the prices of our products to remain profitable, which could result in a loss of customers. If we are unable to increase or maintain our manufacturing capacity, we may be unable to meet demand, which would harm our revenue and results of operations and may result in a loss of customers as they seek supply from other sources.

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We currently depend on third-party suppliers to provide us with wafers for our products. If any of our wafer suppliers are acquired, become insolvent or capacity constrained, or are otherwise unable to provide us sufficient wafers at acceptable yields or at anticipated costs, our revenue and gross margin may decline or we may not be able to fulfill our customer orders.

We have supply arrangements with certain suppliers for the production of wafers. Should any of our suppliers be acquired or become insolvent or capacity constrained, we may not be able to fulfill our customer orders, which would likely cause a decline in our revenue.
 
While certain aspects of our relationships with these suppliers are contractual, many important aspects of our relationships depend on our suppliers’ continued cooperation and our management of such relationships with the suppliers. Our relationships could be negatively impacted by changes in control or changes in the management team of the suppliers. In addition, the fabrication of ICs is a highly complex and precise process. Problems in the fabrication process can cause a substantial percentage of wafers to be rejected or numerous ICs on each wafer to be non-functional. This could potentially reduce yields and supply of our products. The failure of our suppliers to provide wafers at acceptable yields could prevent us from fulfilling our customer orders and would likely cause a decline in our revenue.
 
In addition, adverse macroeconomic conditions, such as inflationary pressures resulting from worldwide supply chain constraints and other factors, have increased, and may continue to increase, the prices we pay to our suppliers. As a result of the increased costs, we have raised, and may be required to further raise the prices of our products in order to remain profitable, which could result in a loss of customers and reduced revenue.
 
Further, as is common in the semiconductor industry, our customers may reschedule or cancel orders on relatively short notice. If our customers cancel orders after we submit a committed forecast to our suppliers for the corresponding wafers, we may be required to purchase wafers that we may not be able to resell, which would adversely affect our financial condition, results of operations and cash flows.

We might not be able to deliver our products on a timely basis if our relationships with our assembly and test subcontractors are disrupted or terminated.

We do not have direct control over product delivery schedules or product quality because all of our products are assembled by third-party subcontractors and a portion of our testing is currently performed by third-party subcontractors. Also, due to the amount of time typically required to qualify assembly and test subcontractors, we could experience delays in the shipment of our products if we were forced to find alternate third parties to assemble or test our products. In addition, events such as the Russia-Ukraine conflict, the Middle East conflict and supply chain disruptions may materially impact our assembly suppliers’ ability to operate. Any future product delivery delays or disruptions in our relationships with our subcontractors could have a material adverse effect on our financial condition, results of operations and cash flows.

We purchase inventory in advance based on expected demand for our products, and if demand is not as expected, we may have insufficient or excess inventory, which could adversely impact our financial position.

As a fabless semiconductor company, we purchase our inventory from third-party manufacturers. We place orders with our manufacturers based on existing and expected orders from our customers for particular products. While most of our contracts with our customers and distributors include lead time requirements and cancellation penalties that are designed to protect us from misalignment between customer orders and inventory levels, we must nonetheless make some predictions when we place orders with our manufacturers. Some of our customers and distributors may nevertheless cancel orders as a result of the impacts of the global economic downturn, their own specific business challenges or for other reasons. In the event that our predictions are inaccurate due to unexpected increases in orders or unavailability of products within the timeframe that is required, we may have insufficient inventory to meet our customers’ demands. In addition, a negative trend in market conditions could lead us to decrease the manufacturing volume of our products to avoid excess inventory. If we inaccurately assess market conditions for our products, we would have insufficient inventory to meet our customer demands resulting in lost potential revenue. In the event that we order products that we are unable to sell due to a decrease in orders, unexpected order cancellations, injunctions due to patent litigation, import/export restrictions or product returns, we may have excess inventory which, if not sold, may need to be written down or would result in a decrease in our revenue in future periods as the excess inventory at our distributors is sold. If any of these situations were to arise, it could have a material impact on our business, financial condition and results of operations.

The price and availability of commodities (e.g., gold, copper and silicon) may adversely impact our ability to deliver our products in a timely and cost-effective manner, and may adversely affect our business and results of operations.

Our products incorporate commodities such as gold, copper and silicon. An increase in the price or a decrease in the availability of these commodities and similar commodities that we use could negatively impact our business and results of operations.

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Risks Associated with Industry Dynamics and Competition

The highly cyclical nature of the semiconductor industry, which has resulted in significant and sometimes prolonged downturns, could materially and adversely affect our financial condition and results of operations.

Historically, the semiconductor industry has been highly cyclical and, at various times, has experienced significant downturns and wide fluctuations in supply and demand. These conditions have caused significant variances in product demand and production capacity, as well as rapid erosion of average selling prices, which have resulted, and could in the future result, in lower demand for our products, downward pressure on the price of our products, and/or increased inventory due to our customers’ delayed production schedule. Because significant portions of our expenses are fixed in the short term or incurred in advance of anticipated sales, we may not be able to decrease our expenses in a timely manner to offset any sales shortfall. Any significant or prolonged downturns would have a material adverse effect on our business, financial condition and results of operations.

Industry consolidation may lead to increased competition and may harm our operating results.

In recent years, there has been a trend toward semiconductor industry consolidation. We expect this trend to continue as companies attempt to improve the leverage of growing research and development costs, strengthen or hold their market positions in an evolving industry, or become unable to continue operations unless they find an acquirer or consolidate with another company. In addition, companies that are strategic alliance partners in some areas of our business may acquire or form alliances with our competitors, thereby reducing their business with us. We believe that semiconductor industry consolidation may result in stronger competitors that are better able to compete as sole-source suppliers of multiple products for customers. This could lead to more variability in our operating results and could have a material adverse effect on our business, financial condition and results of operations.

We compete against many companies with substantially greater financial and other resources, and our market share may be reduced if we are unable to respond to our competitors effectively.

The analog and mixed-signal semiconductor industry is highly competitive, and we expect competitive pressures to continue. Our ability to compete effectively and to expand our business will depend on our ability to continue to recruit application engineers and design talent, introduce new products, and maintain the rate at which we introduce these new products. We compete with domestic and foreign semiconductor companies, many of which have substantially greater financial and other resources with which to pursue engineering, manufacturing, marketing, and distribution of their products, and, in some cases, may have a broader number of product offerings that enable them to more effectively market and sell to customers and engage sales partners. We are in direct and active competition, with respect to one or more of our product lines, with many manufacturers of varying size and financial strength. The number of our competitors has grown due to the expansion of the market segments in which we participate.
 
We cannot guarantee that our products will continue to compete favorably, or that we will be successful in the face of increasing competition from new products and enhancements introduced by existing competitors or new companies entering this market, which would materially and adversely affect our results of operations and our financial condition.
 
In addition, from time to time, governments may provide subsidies or make other investments that could give competitive advantages to many semiconductor companies. For example, in August 2022, the U.S. enacted the CHIPS Act, which, among other things, provides funding to increase domestic production and research and development in the semiconductor industry. Because we operate a fabless business model, we were not eligible for such investments. Many of our competitors benefitted from the investments, which will help increase their production capacities, shorten their lead times and gain market share. These competitive pressures could materially and adversely affect our business, financial condition and results of operations.

We may face competition from customers developing products internally.

Our customers generally have substantial technological capabilities and financial resources. Some customers have traditionally used these resources to develop their own products internally. The future prospects for our products in these markets are dependent in part upon our customers’ acceptance of our products as an alternative to their internally developed products. Future sales prospects also are dependent upon acceptance of third-party sourcing for products as an alternative to in-house development. Customers may continue to increase their use of internally developed components. They may also decide to develop or acquire components, technologies or products that are similar to, or that may be substituted for, our products. If any of these situations were to occur, our business, financial condition and results of operations could be materially and adversely affected.

Risks Associated with IT and Cybersecurity

Implementation of enhanced enterprise resource planning (“ERP”) or other IT systems could result in significant disruptions to our operations.

From time to time, we may implement new ERP software solutions or upgrade existing systems. Implementation of these solutions and systems is highly dependent on coordination of system providers and internal business teams. We may experience difficulties as we transition to these new or upgraded systems and processes, including system downtime causing interruptions in business operations. In addition, transitioning to these new systems may require significant capital investments and personnel resources. Difficulties in implementing new or upgraded information systems or any significant system failures could disrupt our operations and financial reporting, which could have a material adverse effect on our capital resources, financial condition or results of operations.

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Certain software we use is from open-source code sources, which, under certain circumstances, may lead to unintended consequences and, therefore, could materially adversely affect our business, financial condition, operating results and cash flow.

We use open-source software in connection with certain of our products and services, and we intend to continue to use open-source software in the future. From time to time, there have been claims challenging the ownership of open-source software against companies that incorporate open-source software into their products or services or alleging that these companies have violated the terms of an open-source license. As a result, we could be subject to lawsuits by parties claiming ownership of what we believe to be open-source software or alleging that we have violated the terms of an open-source license. Litigation could be costly for us to defend, have a negative effect on our operating results and financial condition or require us to devote additional research and development resources to change our solutions. In addition, if we were to combine our proprietary software solutions with open-source software in certain circumstances, we could, under certain open-source licenses, be required to publicly release the source code of our proprietary software solutions, which could harm our business and ability to compete. If we inappropriately use open-source software, we may be required to re-engineer our solutions, discontinue the sale of our solutions, release the source code of our proprietary software to the public at no cost or take other remedial actions, which could increase our costs, harm our ability to compete and have a material adverse effect on our business, operating results and financial condition. There is also a risk that open-source licenses could be construed in a way that could impose unanticipated conditions or restrictions on our ability to commercialize our solutions, which could adversely affect our business, operating results and financial condition.

System security risks, data protection or privacy breaches, cyberattacks, systems integration issues and unauthorized use of AI tools could disrupt our internal operations and/or harm our reputation, and any such disruption or harm could cause a reduction in our expected revenue, increase our expenses, negatively impact our results of operation or otherwise adversely affect our stock price.

Experienced hackers may be able to penetrate our network security and misappropriate or compromise our confidential and proprietary information, create system disruptions or cause shutdowns. As AI capabilities improve, threat actors may quickly develop more sophisticated and convincing attacks. These attacks could be crafted with an AI tool to directly attack information systems with increased speed and efficiency or create more effective phishing emails. The costs to us to eliminate or alleviate cyber or other security problems, bugs, viruses, worms, malicious software programs and security vulnerabilities could be significant, and our efforts to address these problems may not be successful and could result in interruptions and delays that may impede our sales, manufacturing, distribution, financial reporting or other critical functions.
 
In the ordinary course of business, we store sensitive data on our internal systems, network and servers, such as proprietary business and financial information, and confidential data pertaining to our customers, suppliers and business partners. Maintaining security of sensitive information on our networks and the protection features of our solutions are both critical to our operations and business strategy. We devote significant resources to network security, data encryption, and other security measures to protect our systems and data. However, these security measures cannot provide absolute security. Although we make significant efforts to maintain the security and integrity of our systems and solutions, any destructive or intrusive breach could compromise our networks, creating system disruptions or slowdowns, and the information stored on our networks could be accessed, publicly disclosed, lost or stolen. Remote working arrangements, the Russia-Ukraine conflict, the Middle East conflict, and AI-powered cybersecurity threats have also heightened our potential exposure to cyberattacks, which could put the sensitive data we store on our internal systems at risk. If any of these types of security breaches were to occur and we were unable to protect sensitive data, our reputation and relationships with our business partners and customers could be materially harmed, and we could be exposed to risks of litigation and possible significant liability.
 
Portions of our IT infrastructure may also experience interruptions, delays or cessations of service or produce errors in connection with systems integration or migration work that takes place from time to time. We may not be successful in implementing new systems and transitioning data, which could cause business disruptions and our remediation efforts may be expensive, time consuming, disruptive and resource-intensive. Such disruptions could adversely impact our ability to fulfill orders in a timely manner and interrupt other processes. Delayed sales or a loss of customers resulting from these disruptions could adversely affect our financial results and reputation.
 
Unauthorized use or disclosure of, or access to, any personal information maintained by us or on our behalf, whether through breach of our systems, breach of the systems of our suppliers by an unauthorized party, or through employee error, theft or misuse, or otherwise, could harm our business. If any such unauthorized use or disclosure of, or access to, such personal information was to occur, our operations could be seriously disrupted, and we could be subject to demands, claims and litigation by private parties, and investigations and penalties by regulatory authorities. In addition, we could incur significant costs in notifying affected individuals and entities and otherwise complying with the multitude of foreign, federal, state and local laws and regulations relating to the unauthorized access to, or use or disclosure of, personal information. Finally, any perceived or actual unauthorized access to, or use or disclosure of, such information could harm our reputation and substantially impair our ability to attract and retain customers, which could have an adverse impact on our business, financial condition and results of operations.
 
Our ability to manage and aggregate data may be limited by the effectiveness of our policies, programs, processes, systems and practices that govern how data is acquired, validated, used, stored, protected, processed and shared. Failure to manage data effectively and to aggregate data in an accurate and timely manner may limit our ability to manage current and emerging risks, as well as to manage changing business needs. While we restrict the use of third-party and open-source AI tools, such as ChatGPT, our employees and consultants may use these tools on an unauthorized basis and our partners may use these tools, which poses additional risks relating to the protection of data, including the potential exposure of our proprietary confidential information to unauthorized recipients and the misuse of our or third-party intellectual property. Use of AI tools may result in allegations or claims against us related to violation of third-party intellectual property rights, unauthorized access to or use of proprietary information and failure to comply with open-source software requirements. AI tools may also produce inaccurate responses that could lead to errors in our decision-making, product development or other business activities, which could have a negative impact on our business, operating results and financial condition. Our ability to mitigate these risks will depend on our continued effective maintaining, training, monitoring and enforcement of appropriate policies and procedures governing the use of AI tools, and the results of any such use, by us or our partners.

We are subject to various U.S. and international laws, policies and other regulations regarding data protection.

Privacy, cyber security, and data protection are becoming increasingly significant issues. To address these issues, the Standing Committee of the National People’s Congress promulgated the Cyber Security Law of the People’s Republic of China (the “Cyber Security Law”), which took effect on June 1, 2017. The Cyber Security Law sets forth various requirements relating to the collection, use, storage, disclosure and security of data, among other things. On June 10, 2021, the National People’s Congress passed the Data Security Law of the People’s Republic of China (the “Data Security Law”), which became effective on September 1, 2021. The Data Security Law is the first comprehensive data security legislation in China, which becomes a key supplement to the Cyber Security Law and aims to regulate a wide range of issues in relation to the collection, storage, processing, use, provision, transaction and publication of any kind of data. Various Chinese agencies are expected to issue additional regulations in the future to define these requirements more precisely. For example, the Personal Information Protection Law (“PIPL”), took effect on November 1, 2021. PIPL is aimed at protecting and controlling the use and transfer of personal data in China. There is significant uncertainty in how regulators will interpret and enforce the law, and it contains provisions that allow substantial government oversight and include fines for failure to obtain required approval from China’s cyber and data protection regulators for cross-border transfers of personal data. 

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Effective May 25, 2018, the European Union (“EU”) implemented the General Data Protection Regulation (“GDPR”), a broad data protection framework that expands the scope of EU data protection law to non-European Union entities that process, or control the processing of, the personal data of EU subjects. The GDPR allows for the imposition of fines and corrective action on entities that improperly use, disclose or secure the personal data of EU subjects, including through a data security breach. In addition, an increasing number of states in the U.S. have enacted laws containing similar requirements to the GDPR for businesses collecting or processing personal data. For example, the State of California enacted the California Consumer Privacy Act of 2018 (“CCPA”), which was significantly amended by the California Privacy Rights Act, and sets forth comprehensive privacy and security obligations regarding the collection and processing of personal data of eligible California residents. Other states have, or are expected to, enact similar or more expansive legislation regarding the collection and processing of personal data.
 
These regulatory requirements may increase our costs of compliance. Any failure to fully comply with the Cyber Security Law, the Data Security Law, PIPL, GDPR, CCPA, and other applicable laws and regulations could lead to significant fines and regulatory corrective actions, along with reputational damage or third-party lawsuits, which could adversely affect our business and results of operations. In addition, data security breaches experienced by us could result in the loss of trade secrets or other intellectual property, public disclosure of sensitive commercial data, and the exposure of personal data (including sensitive personal data) of our employees, customers, suppliers and others. Such incidents could subject us to significant monetary damages, regulatory enforcement actions and/or criminal prosecution, and cause us to lose customers and their related revenue in the future.

Risks Associated with Strategic Investments and Initiatives

Our success depends on our investment of significant resources in research and development. We may have to invest more resources in research and development than anticipated, which could increase our operating expenses and negatively impact our operating results.

Our success depends on us investing significant amounts of resources in research and development. We expect to continue investing heavily in research and development in the future in order to keep innovating and introducing new products in a timely manner and increase our revenue and profitability. Increased investments in research and development will increase our operating expenses, which may negatively impact our operating results, and we may not achieve the return on these investments that we anticipate, or be able to reduce such expenses in a timely manner if we experience a downturn in sales. Also, if we are unable to properly manage and effectively utilize our research and development resources, we could see material adverse effects on our business, financial condition and operating results.
 
In addition, if new competitors, technological advances by existing competitors, our entry into new markets, or other competitive factors require us to invest significantly greater resources than anticipated in our research and development efforts, our operating expenses would increase further. If we are required to invest significantly greater resources than anticipated in research and development efforts without a corresponding increase in revenue, our operating results could be harmed. Many of our competitors have significantly greater resources than we have and are able to invest substantially greater amounts into research and development initiatives than we are, which could harm our ability to innovate and compete. Research and development expenses are likely to fluctuate from time to time to the extent we make periodic incremental investments in research and development and these investments may be independent of our level of revenue, which could negatively impact our financial results. In order to remain competitive, we anticipate that we will continue to devote substantial resources to research and development, and we expect these expenses to increase in the foreseeable future due to the increased complexity and the greater number of products under development.

We may not realize the anticipated benefits of any company or business that we acquire. In addition, acquisitions could result in diluting the ownership interests of our stockholders, reduce our cash balances and/or cause us to incur debt or to assume contingent liabilities, which could adversely affect our business. 

As part of our business strategy, from time to time we review acquisition prospects that would complement our current product offerings, enhance our design capability or offer other competitive opportunities. As a result of completing acquisitions, we could use a significant portion of our available cash, cash equivalents and short-term investments, issue equity securities that would dilute current stockholders’ percentage ownership, or incur substantial debt or contingent liabilities. Such actions could impact our financial condition, operating results and the price of our common stock.
 
In addition, we may be unable to identify or complete prospective acquisitions for various reasons, including competition from other companies in the semiconductor industry, the valuation expectations of acquisition candidates and applicable antitrust or other policies, laws or regulations. If we are unable to identify and complete acquisitions, we may not be able to successfully expand our business and product offerings.
 
In January 2024, we completed the acquisition of Axign B.V. (“Axign”), a fabless semiconductor company located in the Netherlands that specializes in the development of consumer audio applications. We cannot guarantee that this or any future acquisitions will improve our results of operations or that we will otherwise realize the anticipated benefits of any acquisitions. In addition, if we are unsuccessful in integrating Axign, or any acquired company or business into our operations, or if integration is more difficult than anticipated, we may experience disruptions that could harm our business and result in our failure to realize the anticipated benefits of the acquisitions. Some of the risks that may adversely affect our ability to integrate or realize any anticipated benefits from the acquired companies, businesses or assets include those associated with:

• unexpected losses of key employees or customers of the acquired companies or businesses;

• integrating the acquired company’s standards, processes, procedures and controls with our operations;

• coordinating new product and process development;

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• hiring additional management and other critical personnel;

• increasing the scope, geographic diversity and complexity of our operations;

• difficulties in consolidating facilities and transferring processes and know-how;

• difficulties in the assimilation of acquired operations, technologies or products;

• undisclosed liabilities of the acquired businesses and potential legal disputes with founders or stockholders of acquired companies;

• our inability to commercialize acquired technologies;

• the projected business potential is not realized and as a result, we may be required to take an impairment charge related to goodwill or acquired intangibles that would impact our profitability;

• difficulties in assessing the fair value of earn-out arrangements;

• diversion of management’s attention from other business concerns; and

• adverse effects on existing business relationships with customers.

Alternatively, third parties may be interested in acquiring us. We will continue to consider, evaluate and negotiate any such transactions as our Board of Directors deems appropriate and in the best interest of our stockholders. Such potential transactions may divert the attention of management, and cause us to incur various costs and expenses in investigating, evaluating and negotiating such transactions, whether or not they are consummated.

Risks Associated with Financial Reporting

The complexity of calculating our tax provision may result in errors that could result in restatements of our financial statements.

Due to the complexity associated with the calculation of our tax provision, including the effects of the enactment of new tax laws, we engage third-party tax advisors to assist us in the calculation. If we or our tax advisors fail to resolve or fully understand certain issues that we may have had in the past and issues that may arise in the future, we could be subject to errors, which, if material, would result in a restatement of our financial statements. Restatements are generally costly and could adversely impact our results of operations, damage our reputation, and/or have a negative impact on the trading price of our common stock.

Changes in effective tax rates or adverse outcomes resulting from examination of our income tax returns could adversely affect our results of operations.
 
Our future effective tax rates could be adversely affected by earnings being lower than anticipated in countries where we have lower statutory rates and higher than anticipated in countries where we have higher statutory rates, by changes in the valuation of our deferred tax assets, or by changes in tax laws, regulations, accounting principles or interpretations thereof and discrete items. In addition, we are subject to potential future examinations of our income tax returns by the Internal Revenue Service (the “IRS”) and tax authorities in various jurisdictions where we have business operations. We assess the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of our provision for income taxes. There can be no assurance that the outcomes from any examinations will not have an adverse effect on our financial condition and results of operations.

Our international operations subject us to potentially significant tax consequences, which could adversely affect our results of operations.
 
We conduct our international operations through wholly-owned subsidiaries, branches and representative offices and report our taxable income in various jurisdictions worldwide based upon our business operations in those jurisdictions. Such corporate structures are subject to complex transfer pricing, permanent establishment challenges and other local regulations administered by taxing authorities in various jurisdictions. Our provision for income taxes and cash tax liabilities in the future could be adversely affected by numerous factors, including changes in the geographic mix of our earnings and corporate tax rates among jurisdictions, challenges by tax authorities to our tax positions and intercompany transfer pricing arrangements, failure to meet performance obligations with respect to tax incentive agreements, expanding our operations in various countries, fluctuations in foreign currency exchange rates, adverse resolution of audits and examinations of previously filed tax returns, and changes in tax laws and regulations. The relevant taxing authorities may disagree with our determinations as to the income and expenses attributable to specific jurisdictions. If such a disagreement were to occur, and our positions were not sustained, we could be required to pay additional taxes, interest and penalties, resulting in higher effective tax rates, reduced cash flows and lower overall profitability of our operations. Additionally, our future worldwide tax rates, financial position and operating results may be affected by changes in the relevant tax laws, interpretation of such tax laws or the influence of certain tax policy efforts, including in the EU and the Organization for Economic Cooperation and Development.

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We face risks in connection with our internal control over financial reporting and a material weakness was identified.

As more fully disclosed in Item 9A. Controls and Procedures of this Annual Report, late in the audit process, a material weakness was identified that existed as of December 31, 2023, regarding ineffective design of the controls related to management’s review and documentation of our inventory demand information and other assumptions used to determine the inventory carrying value adjustments necessary to record such quantities at the lower of their cost or net realizable value.

Due to this finding of a material weakness, we concluded that our internal control over financial reporting was not effective as of December 31, 2023. While we do not believe that this material weakness has impacted the accuracy or reporting of our consolidated financial results, until this material weakness is remediated, or should new material weaknesses arise or be discovered in the future, there is a reasonable possibility that a material misstatement of our interim or annual financial statements will not be prevented or detected on a timely basis. In addition, we may experience delays in satisfying our reporting obligations to comply with SEC rules and regulations, which could result in investigations and sanctions by regulatory authorities. Any of these results could adversely affect our business and the value of our common stock. 

Risks Associated with Regulatory Compliance, Intellectual Property Protection and Litigation
 
We are subject to anti-corruption laws in the jurisdictions in which we operate, including the U.S. Foreign Corrupt Practices Act (the “FCPA”) and the U.K. Bribery Act. Our failure to comply with these laws could result in penalties which could harm our reputation and have a material adverse effect on our business, financial condition and results of operations.
 
We are subject to the FCPA, the U.K. Bribery Act and various anti-corruption laws of other jurisdictions, which generally prohibit companies and their intermediaries from making improper payments to foreign officials for the purpose of obtaining or keeping business and/or other benefits. Although we have implemented policies and procedures designed to ensure that we, our employees and other intermediaries comply with the FCPA, the U.K. Bribery Act and other anti-corruption laws to which we are subject, there is no assurance that such policies or procedures will work effectively all the time or protect us against liability under these laws for actions taken by our employees and other intermediaries with respect to our business or any businesses that we may acquire. We have significant operations in Asia, which place us in frequent contact with individuals who may be considered “foreign officials” under the FCPA or other anti-corruption laws, resulting in an elevated risk of potential violations. If we are not in compliance with the FCPA and other laws governing the conduct of business with government entities (including local laws), we may be subject to criminal and civil penalties and other remedial measures, including restatements of our financial reports, which could have a material adverse impact on our business, financial condition, results of operations and liquidity. Any investigation or allegations of any potential violations of the FCPA or other anti-corruption laws by the U.S. or foreign authorities could harm our reputation and have an adverse impact on our business, financial condition and results of operations.

Our business is subject to various governmental laws and regulations, and compliance with these regulations may impact our revenue and cause us to incur significant expense. If we fail to maintain compliance with applicable regulations or obtain government licenses and approvals for our desired international trading activities or technology transfers, we may be forced to recall products and cease their distribution, and we could be subject to civil or criminal penalties.
 
Our business is subject to various significant laws and other legal requirements imposed by the U.S. and other countries we conduct business in, including export control laws such as the Export Administration Act, the Export Administration Regulations and other laws, regulations and requirements governing international trade and technology transfer. These laws and regulations are complex, change frequently and have generally become more stringent over time. We may be required to incur significant expense to comply with these regulations or to remedy violations of these regulations. In addition, if our customers fail to comply with these regulations, we may be required to suspend sales to these customers, which could negatively impact our results of operations. We must conform the manufacture and distribution of our products to various laws and adapt to regulatory requirements in many countries as these requirements change. If we fail to comply with these requirements in the manufacture or distribution of our products, we could be required to pay civil penalties, face criminal prosecution and, in some cases, be prohibited from distributing our products commercially until the products are brought into compliance.

Environmental laws and regulations could cause a disruption in our business and operations.
 
We are subject to various foreign, federal, state and local laws and regulations that govern the environment, including those restricting the presence of certain substances in electronic products and making manufacturers of those products financially responsible for the collection, treatment, recycling and disposal of certain products. Such laws and regulations have been passed in several jurisdictions in which we operate, including various EU member countries and countries in Asia. There can be no assurance that similar laws and regulations will not be implemented in other jurisdictions resulting in additional costs, possible delays in delivering products, and even the discontinuance of existing and planned future products if the costs were to become prohibitive.

We are subject to increasing regulatory and reporting standards related to ESG matters, which could increase our expenses.
 
In recent years, there has been an increase in public awareness and requirements from regulators, investors, customers and other key stakeholders focusing on ESG compliance efforts, including those related to environmental sustainability and social responsibility. For example, the SEC has proposed new rules that require public companies to provide detailed disclosures of their climate-related risks, greenhouse gas emissions data, and net-zero transition plans, and in October 2023, California passed two bills that will require companies to disclose greenhouse gas emissions data and climate-related financial risks. In addition, many of our customers increasingly include stringent environmental and other non-standard compliance requirements in their contracts with us or request significant amount of data from us for their Scope 3 emissions reporting. While we are committed to maintaining strong ESG strategies, practices, policies and disclosures, there can be no assurance that we will be able to achieve our goals, or that our compliance initiatives will be deemed sufficiently robust by regulators, stockholders, customers and other key stakeholders. The achievement of our goals and initiatives may be impacted by factors that are outside our control. Some of our stakeholders may disagree with our goals and initiatives, and the focus and views of our stakeholders may change and evolve over time and vary depending on the jurisdictions in which we operate. Any failure, or perceived failure, by us to achieve our goals, implement new initiatives, comply with federal, state or international laws and regulations, or meet evolving and varied stakeholder expectations and views, could result in litigation, regulatory action or other legal claims, penalties, injunction or other remedies against us, damage our reputation and materially and adversely affect our business, financial condition and results of operations.
 
Furthermore, our compliance efforts, including the collection, assessment and reporting of ESG data, are subject to evolving reporting standards and can be costly, complex and time-consuming. In addition, climate change concerns and the potential associated environmental impact could result in the proposal and passage of additional laws and regulations in various jurisdictions that may affect us, our suppliers and customers. Such laws and regulations could cause us to incur additional compliance costs, and failure to comply with the regulatory standards in a timely manner could result in penalties and fines. These operational, legal, compliance and other risks could damage our reputation and materially and adversely affect our business, financial condition and results of operations.

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Given our inability to control the timing and nature of significant events in our legal proceedings that either have arisen or may arise, our legal expenses are difficult to forecast and may vary substantially from our publicly disclosed forecasts with respect to any given quarter, which could contribute to increased volatility in our stock price and financial condition.
 
Historically, we have incurred significant expenses in connection with various legal proceedings that vary with the level of activity in the proceeding. It is difficult for us to forecast our legal expenses for any given quarter, which adversely affects our ability to forecast our expected results of operations in general. We may also be subject to unanticipated legal proceedings, which would result in us incurring unexpected legal expenses. If we fail to meet the expectations of securities or industry analysts as a result of unexpected changes in our legal expenses, our stock price could be materially and adversely affected.

Future legal proceedings may divert our financial and management resources.
 
The semiconductor industry is characterized by frequent claims of infringement and litigation regarding patent and other intellectual property rights. Patent infringement is an ongoing risk, in part because other companies in our industry could have patent rights that may not be identifiable when we initiate development efforts. Litigation may be necessary to enforce our intellectual property rights, and we may have to defend ourselves, and in some circumstances our key customers or suppliers, against additional infringement claims. Such litigation is very costly. Further, in connection with these legal proceedings, we may be required to post bonds to defend our intellectual property rights in certain countries for an indefinite period of time, until such dispute is resolved. If our legal expenses materially increase or exceed anticipated amounts, our capital resources and financial condition could be adversely affected. If we are not successful in any of our intellectual property defenses, we may have to cease production of certain products, design around such technologies, or pay royalty payments, any of which could harm our financial condition and our business. Our management team may also be required to devote a great deal of time and effort to these legal proceedings, which could divert management’s attention from focusing on our operations, which could adversely affect our business.

Failure to protect our proprietary technologies or maintain the right to certain technologies may negatively affect our ability to compete.
 
We rely heavily on our proprietary technologies. Our future success and competitive position depend in part upon our ability to obtain and maintain protection of certain proprietary technologies used in our products. We pursue patents for some of our new products and unique technologies, and we also rely on a combination of nondisclosure agreements and other contractual provisions, as well as our employees’ commitment to confidentiality and loyalty, to protect our technology, know-how and processes. Despite the precautions we take, it may be possible for unauthorized third parties to copy aspects of our current or future technologies or products, or to obtain and use information that we regard as proprietary. We intend to continue to protect our proprietary technologies, including through patents. However, there can be no assurance that the steps we take will be adequate to protect our proprietary rights, that our patent applications will lead to issued patents, that others will not develop or patent similar or superior products or technologies, or that our patents will not be challenged, invalidated or circumvented by others. Furthermore, the laws of the countries in which our products are or may be developed, manufactured or sold may not protect our products and intellectual property rights to the same extent as laws in the U.S. Our failure to adequately protect our proprietary technologies could materially harm our business.

If we are unsuccessful in legal proceedings brought against us or any of our customers, we could be prevented from selling many of our products and/or be required to pay substantial damages. An unfavorable outcome or an additional award of damages, attorneys’ fees or an injunction could cause our revenue to decline significantly and could severely harm our business and operating results.
 
From time to time, we are a party to various legal proceedings. If we are not successful in litigation that could be brought against us or our customers, we could be ordered to pay monetary fines and/or damages, including expenses and damages against our customers. If we are found liable for willful patent infringement, damages could be significant. We and/or our customers could also be prevented from selling some or all of our products. Moreover, our customers and end users could decide not to use our products, and our products and our customers’ accounts payable to us could be seized. Finally, interim developments in these proceedings could increase the volatility in our stock price as the market assesses the impact of such developments on the likelihood that we will or will not ultimately prevail in these proceedings. Even if resolved favorably, such proceedings can be very expensive and time consuming, and may divert management’s attention from other business operations.

Risks Associated with Human Capital Management
 
The loss of any of our key personnel or the failure to attract or retain specialized technical and management personnel could affect our operations or impair our ability to grow our business.
 
Our future success depends upon our ability to attract and retain highly qualified technical and managerial personnel. We are particularly dependent on the continued services of our key executives, including Michael Hsing, our President and Chief Executive Officer, who founded our company and developed our proprietary process technology. In addition, personnel with highly skilled analog and mixed-signal design engineering expertise are scarce and competition for personnel with these skills is intense. There can be no assurance that we will be able to retain existing key employees or that we will be successful in attracting, integrating or retaining other highly qualified personnel with critical capabilities in the future. If we are unable to retain the services of existing key employees or are unsuccessful in attracting new highly qualified employees quickly enough to meet the demands of our business, including design cycles, our business could be harmed. Furthermore, if we lose key personnel, the search for a qualified replacement and the transition could interrupt our operations as the search could take us longer than expected and divert management resources, and the newly hired employee could take longer than expected to effectively integrate into the team.

If we fail to retain key employees in our sales, engineering, finance and legal functions or to make continued improvements to our internal systems, our business may suffer.
 
If we fail to continue to adequately staff our sales, engineering, financial and legal positions, maintain or upgrade our business systems and maintain internal controls that meet the demands of our business, we may not be able to effectively execute our business strategy. The operation of our business also depends upon our ability to retain these employees, as they hold a significant amount of institutional knowledge about us and our products and, if they were to terminate their employment, our sales, operations and internal control over financial reporting could be adversely affected.

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Risks Associated with Ownership of Our Stock

The future trading price of our common stock could be subject to wide fluctuations in response to a variety of factors.
 
The trading price of our common stock has been, and is likely to continue to be, highly volatile and could be subject to wide fluctuations in response to various factors, many of which are beyond our control, including:

• actual or anticipated results of operations and financial performance, including our ability to accurately forecast future demand for our products;

• actual or anticipated manufacturing capacity limitations;

• our ability to develop new products, enter new market segments, gain market share, manage litigation risk, diversify our customer base and successfully secure manufacturing capacity;

• our ability to maintain or increase our gross margins;

• costs of increasing wafer capacity and qualifying additional third-party wafer fabrication facilities;

• our loss of key customers;

• investments in sales and marketing resources to enter new markets;

• commencement of or developments relating to litigation;

• cyberattacks or other system security, data protection and privacy breaches;

• the inclusion, exclusion or deletion of our common stock from any major trading indices, such as the S&P 500 Index;

• our sale of common stock or other securities in the future;

• any mergers, acquisitions or divestitures of assets undertaken by us;

• our ability to obtain governmental licenses and approvals for international trading activities or technology transfers, including export licenses;

• our ability to meet or exceed the guidance that we provide to our investors and analysts;

• our ability to continue the stock repurchase program and pay quarterly cash dividends to stockholders;

• our ability to meet or exceed our, our investors’ or analysts’ expectations;

• market reactions to guidance from other semiconductor companies or third-party research groups;

• market reactions to merger and acquisition activities in the semiconductor industry, and rumors or expectations of further consolidation in the industry;

• investor perceptions of us and our business strategies;

• the breadth and liquidity of the market for our common stock;

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• trading activity in our common stock, including short positions;

• actions by institutional or other large stockholders;

• changes in the estimation of the future size and growth rate of our markets;

• introduction of new products by us or our competitors;

• general economic, industry and market conditions worldwide, including any global economic downturn;

• developments generally affecting the semiconductor industry;

• terrorist acts or acts of war, including the ongoing Ukraine-Russia and Middle East conflicts;

• epidemics and pandemics;

• developments with respect to intellectual property rights;

• conditions and trends in technology industries;

• changes in market valuation or earnings of our competitors;

• government debt default;

• changes in corporate tax laws;

• government policies and regulations on international trade policies and restrictions, including tariffs on imports of foreign goods;

• export controls, trade and economic sanctions and regulations, and other regulatory or contractual limitations on our ability to sell or develop our products in certain foreign markets, particularly in China;

• ratings published by third-party organizations with respect to our ESG compliance efforts;

• our compliance with regulatory mandates focusing on ESG issues, including climate risks and social initiatives; and

• our performance against the ESG guidelines set by institutional stockholders and customers, and our ability to meet or exceed their expectations.

In addition, the stock market often experiences substantial volatility that may be unrelated to the operating performance of particular companies. These broad market fluctuations may adversely affect the trading price of our common stock.

If securities or industry analysts downgrade our stock or do not continue to publish research or reports about our business, our stock price and trading volume could decline.
 
The trading market for our common stock will depend, in part, on the research and reports that industry or securities analysts publish about us or our business. We do not have any control over these analysts. If we fail to meet the expectations of these analysts, or one or more of the analysts who cover us downgrade our stock, our stock price would likely decline. If one or more of these analysts cease coverage of us or fail to regularly publish reports on us, we could lose visibility in the financial markets, which in turn could cause our stock price or trading volume to decline.

Short positions in our stock could have a substantial impact on the trading price of our stock.
 
Historically, there have been “short” positions in our common stock. The anticipated downward pressure on our stock price due to actual or anticipated sales of our stock by some institutions or individuals who engage in short sales of our common stock could cause our stock price to decline. Such stock price decreases could encourage further short-sales that could place additional downward pressure on our stock price. This could lead to further increases in the existing short position in our common stock and cause decreases and volatility in our stock price. The volatility of our stock may cause the value of a stockholder’s investment to decline rapidly. Additionally, if our stock price declines, it may be more difficult for us to raise capital and may have other adverse effects on our business.

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There can be no assurance that we will continue to declare cash dividends in any particular amounts or at all.
 
We have a dividend program approved by our Board of Directors, pursuant to which we intend to pay quarterly cash dividends on our common stock. The declaration of any future cash dividends is at the discretion of our Board of Directors and will depend on, among other things, our financial condition, results of operations, capital requirements, business conditions, and other factors that our Board of Directors may deem relevant, as well as a determination that cash dividends are in the best interests of our stockholders. Our dividend payments may change from time to time, and we cannot provide assurance that we will continue to declare dividends in any particular amounts or at all. A reduction in or elimination of our dividend payments could have a negative effect on the price of our common stock and on the return achieved by our stockholders. 

We cannot guarantee that our stock repurchase program will enhance long-term stockholder value.

In October 2023, our Board of Directors approved a stock repurchase program authorizing the repurchase of up to $640 million in the aggregate of our common stock. The repurchase program will expire on October 29, 2026. The amount, timing and execution of our stock repurchase program may fluctuate based on market conditions and our priorities for the use of our cash. We are not obligated to repurchase a specified number or dollar value of shares, on any particular timetable, or at all. The repurchase program may be suspended or terminated at any time and, even if fully implemented, may not enhance long-term stockholder value.

If we issue additional shares of stock in the future, it may have a dilutive effect on our stockholders.
 
We may issue additional shares of common stock in the future in order to raise additional capital to fund our global operations or in connection with an acquisition. Any issuance of our common stock may result in immediate dilution to our stockholders. In addition, the issuance of a significant amount of our common stock may require additional regulatory compliance, such as stockholder approval.

General Risk Factors

Our worldwide operations are subject to economic and geopolitical uncertainty, health risks, climate crises and other natural disasters, which could have a material adverse effect on our business operations.

Our offices in California and Washington, the production facilities of our third-party wafer suppliers, our IC testing and manufacturing facilities, a portion of our assembly and research and development activities, and certain other critical business operations are located in or near seismically active regions and are subject to periodic earthquakes. We do not maintain earthquake insurance and could be materially and adversely affected in the event of a major earthquake. Much of our revenue, as well as our manufacturing and assembly partners, are concentrated in Asia, particularly in China. Such concentration increases the risk that earthquakes or other natural disasters, labor strikes, epidemics and pandemics, and/or health advisories could disrupt our operations and have a material adverse impact on our business and results of operations. For example, in 2022, China experienced a severe heatwave during the summer months in the Sichuan province, which resulted in widespread power shortages, rolling backouts and temporary business shutdowns imposed by the local governments. Although we were able to successfully execute our contingency plan and our operations were not materially and adversely disrupted by the events, we cannot guarantee that we will be able to mitigate the operational risks caused by extreme weather conditions or other events in the future.

 
In addition, we rely heavily on our internal information and communications systems and on systems or support services from third parties to manage our operations efficiently and effectively. Any of these are subject to failure due to a natural disaster or other disruptions. System-wide or local failures that affect our information processing could have material adverse effects on our business, financial condition and results of operations.

Furthermore, worldwide political conditions may create uncertainties that could adversely affect our business. The U.S. and other regions where we conduct business have been and may continue to be affected by conflicts that could, among other things, disrupt our supply chain, and impact customer demands and component prices. For example, the U.S. and other countries have imposed economic sanctions and export control measures on Russia due to the conflict in Ukraine. Although such measures have not significantly affected our business or operations, future developments could adversely affect our operating results and financial condition.

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Item 1B. Unresolved Staff Comments

None.

Item 1C. Cybersecurity

Cybersecurity Risk Management and Strategy

We recognize the imperative to diligently manage cybersecurity risks as defined in Item 106(a) of Regulation S-K. Such risks include operational risks of ransomware, phishing, fraud, extortion, harm to employees or customers and violation of data privacy or security laws.

We address cybersecurity risks in our business, technical operations, privacy and compliance issues through a diversified approach including threat-monitoring and assessments by third-parties, adopting IT security ISO standards/governance, proactive risk and compliance reviews. In order to defend against cybersecurity incidents, we carry out real-time cybersecurity threat monitoring of IT assets, perform penetration testing, audit applicable data policies and conduct directed employee training. We also monitor existing and emerging laws and regulations related to data protection and information security and implement appropriate changes. We maintain an insurance policy that provides certain coverage for losses we incur due to data breaches and other cybersecurity incidents.

We implemented incident response and breach management processes consisting of four stages: 1) monitor for and identify cybersecurity incidents, 2) carry out security incident analysis, 3) contain and recover, and 4) improve with post-incident analysis. Such incident responses are governed by the Cybersecurity Steering Committee.

We regularly engage external auditors to assess our internal cybersecurity programs and compliance and have been certified to conform to the requirements of ISO/IEC 27001.

There are no identified cybersecurity threats that have materially affected or are reasonably likely to materially affect our results of operations, or financial condition as of the date of this Annual Report on Form 10-K.

See “Risk Factors” for more information on our cybersecurity risks.

Cybersecurity Governance

As an important part of our risk management processes, cybersecurity is a focus area for our Board and management. Our Nominating and Corporate Governance Committee (the “NCG Committee”), which consists of independent members of the Board of Directors, is responsible for the oversight of risks from cybersecurity threats. The NCG Committee receives quarterly updates from the Cybersecurity Steering Committee. These updates include existing and emerging cybersecurity threats, risks, cybersecurity incident management and key information security initiatives. The NCG Committee also provides updates to our cybersecurity risk management and strategy programs to the Board of Directors on a quarterly basis.

Our cybersecurity risk management and strategy processes are overseen by the Cybersecurity Steering Committee, which includes individuals with an average of over 18 years of prior work experience in various roles involving IT governance and management, cybersecurity, auditing, and compliance. The Cybersecurity Steering Committee actively participates in the cybersecurity risk management and strategy processes as described above, and regularly reports to senior management and the NCG Committee. 

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Item 2. Properties

As of December 31, 2023, our owned and leased facilities in excess of 10,000 square feet consisted of:

	United States		Other Countries		Total
			(in square feet)
Owned facilities		216,000		923,000		1,139,000
Leased facilities		-		290,000		290,000
Total facilities		216,000		1,213,000		1,429,000

We also lease other sales and marketing, and research and development offices in Asia, Europe and the United States. We believe that our existing facilities are suitable for our current operations.

Item 3. Legal Proceedings

We are a party to actions and proceedings in the ordinary course of business, including challenges to the enforceability or validity of our intellectual property, claims that our products infringe on the intellectual property rights of others, and employment matters. We may also be subject to litigation initiated by our stockholders. These proceedings often involve complex questions of fact and law and may require the expenditure of significant funds and the diversion of other resources to prosecute and defend. We defend ourselves vigorously against any such claims. As of December 31, 2023, there were no material pending legal proceedings to which we were a party. 

Item 4. Mine Safety Disclosures

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Common Stock Information

Our common stock is traded on the Nasdaq Global Select Market under the symbol “MPWR”.

Holders of Common Stock

As of February 22, 2024, there were 68 registered holders of record of our common stock. A substantially greater number of holders of our common stock are “street name” or beneficial holders, whose shares are held by banks, brokers and other financial institutions on their behalf.

Issuer Purchases of Equity Securities

In October 2023, our Board of Directors approved a stock repurchase program authorizing us to repurchase up to $640.0 million in the aggregate of our common stock through October 29, 2026. Shares are retired upon repurchase. We repurchased approximately 7,000 shares of our common stock for an aggregate purchase price of $3.7 million during the year ended December 31, 2023.

Stock repurchases under the program may be made through open market repurchases, privately negotiated transactions or other structures in accordance with applicable state and federal securities laws, at times and in amounts as management deems appropriate. The timing and the number of any repurchased common stock will be determined by our management based on the evaluation of market conditions, legal requirements, stock price, and other factors. The repurchase program does not obligate us to purchase any particular number of shares and may be suspended, modified, or discontinued at any time without prior notice.

The following table represents details of our stock repurchase transactions during the fourth quarter of 2023:

Period	Total Number of Shares Purchased		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Program		Approximate Dollar Value of Shares that May Yet Be Purchased Under the Program
	(in thousands, except per share amounts)
November 1, 2023 – November 30, 2023		5	$	505.65		5	$	637,465
December 1, 2023 – December 31, 2023		2	$	603.15		2	$	636,259
Total		7	$	533.45		7

Dividend Policy

We currently have a dividend program approved by our Board of Directors, pursuant to which we intend to pay quarterly cash dividends on our common stock. Based on our historical practice, stockholders of record as of the last business day of the quarter are entitled to receive the quarterly cash dividends when and if declared by our Board of Directors, which are payable to the stockholders in the following month. 

The declaration of any future cash dividends is at the discretion of our Board of Directors and will depend on, among other things, our financial condition, results of operations, capital requirements, business conditions and other factors that our Board of Directors may deem relevant, as well as a determination that cash dividends are in the best interests of the stockholders.

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Stock Performance Graph

The following graph compares the cumulative five-year total return on our common stock relative to the cumulative total returns of the Nasdaq Composite Index and the PHLX Semiconductor Sector Index. An investment of $100 is assumed to have been made in our common stock on December 31, 2018, and its performance relative to the performance of a similar investment in the two indexes is shown through December 31, 2023, assuming the reinvestment of dividends. Historic stock performance is not indicative of future performance.

The information contained in this stock performance graph section shall not be deemed to be “soliciting material,” or “filed” or incorporated by reference in future filings with the SEC, or subject to the liabilities of Section 18 of the Securities Exchange Act of 1934, except to the extent that we specifically incorporate it by reference into a document filed under the Securities Act of 1933 or the Securities Exchange Act of 1934.

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Item 6. [Reserved]

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion should be read in conjunction with the consolidated financial statements and related notes which appear under Item 8 in this Annual Report on Form 10-K. This discussion and analysis contain, in addition to historical information, forward-looking statements that involve risks and uncertainties. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of many factors, including those set forth under “Part I, Item 1A. Risk Factors” and elsewhere in this Annual Report on Form 10-K.

Discussions of 2021 results and year-to-year comparisons between 2022 and 2021 that are omitted in this Annual Report on Form 10-K can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part II, Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 24, 2023.

Overview

We are a fabless global company that provides high-performance, semiconductor-based power electronics solutions. MPS’s mission is to reduce energy and material consumption to improve all aspects of quality of life and create a sustainable future. Founded in 1997 by our CEO Michael Hsing, MPS has three core strengths: deep system-level knowledge, strong semiconductor design expertise, and innovative proprietary technologies in the areas of semiconductor processes, system integration, and packaging. These combined advantages are designed to enable MPS to deliver reliable, compact, and monolithic solutions that are highly energy-efficient, cost-effective, and environmentally responsible while providing a consistent return on investment to our stockholders.

We operate in the cyclical semiconductor industry. We are subject to industry downturns, but we have targeted product and market areas that we believe have the ability to offer above average industry performance over the long term. Historically, our revenue has generally been higher in the second half of the year than in the first half although various factors, such as market conditions and the timing of key product introductions, could impact this trend.

We work with third parties to manufacture and assemble our ICs. This has enabled us to limit our capital expenditures and fixed costs, while focusing our engineering and design resources on our core strengths.

Following the introduction of a product, our sales cycle generally takes a number of quarters after we receive an initial customer order for a new product to ramp up. Typical supply chain lead times for orders are generally 16 to 26 weeks. These factors, combined with the fact that our customers can cancel or reschedule orders without significant penalty to the customer, make the forecasting of our orders and revenue difficult.

We derive most of our revenue from sales through distribution arrangements and direct sales to customers in Asia, where our products are incorporated into end-user products. Our revenue from direct or indirect sales to customers in Asia was 87%, 86% and 90% for the years ended December 31, 2023, 2022 and 2021, respectively. We derive a majority of our revenue from the sales of our DC to DC converter products which serve the storage and computing, enterprise data, automotive, industrial, communications and consumer markets. We believe our ability to achieve revenue growth will depend, in part, on our ability to develop new products, enter new market segments, gain market share, manage litigation risk, diversify our customer base and continue to secure manufacturing capacity.

Macroeconomic Conditions and Recent Regulations

During 2023, the semiconductor industry faced, and continues to face, a number of macro-economic challenges including reduced consumer spending, fluctuations in demand for semiconductors, rising inflation, increased interest rates, and fluctuations in currency rates. We remain cautious in light of continued challenging macroeconomic conditions and will continue to monitor the potential impact on our operations. The extent and duration of the direct and indirect impact of macroeconomic events on our business, results of operations and overall financial position remain uncertain and depend on future developments.

We closely monitor changes to export control laws, trade regulations and other trade requirements. As of December 31, 2023 and through the date we filed this Annual Report, no existing or newly introduced restrictions have had a material impact on our revenue and operations. We will continue to monitor any changes or developments to export control laws, trade regulations and other trade requirements, or interpretations thereof and are committed to complying with all applicable trade laws, regulations and other requirements.

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Critical Accounting Policies and Estimates

Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). The preparation of these financial statements requires us to make estimates and judgments that affect the reported amount of assets, liabilities, revenue and expenses, and related disclosure of contingent assets and liabilities. We evaluate our estimates on an on-going basis, including those related to revenue recognition, stock-based compensation, inventories, income taxes and contingencies. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making the judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Estimates and judgments used in the preparation of our financial statements are, by their nature, uncertain and unpredictable, and depend upon, among other things, many factors outside of our control, including demand for our products, economic conditions and other current and future events, such as macroeconomic factors, including the impact of the 2023 banking crisis, global economic downturn, Russia-Ukraine conflict and the Middle East conflict. Actual results could differ from these estimates and assumptions, and any such differences may be material to our consolidated financial statements. See Note 1 of the Notes to Consolidated Financial Statements included in Item 8 of this Annual Report on Form 10-K for a summary of significant accounting policies and the effect on our financial statements. 

We believe the following critical accounting policies reflect our more significant judgments used in the preparation of our consolidated financial statements. 

Revenue Recognition 

We account for price adjustments and stock rotation rights as variable consideration that reduces the transaction price and recognize that reduction in the same period the associated revenue is recognized. Certain U.S.-based distributors have price adjustment rights when they sell our products to their end customers at a price that is lower than the distribution price invoiced by us. When we receive claims from the distributors that products have been sold to the end customers at the lower price, we issue the distributors credit memos for the price adjustments. We estimate the price adjustments using the expected value method based on an analysis of historical claims, at both the distributor and product level, as well as an assessment of any known trends of product sales mix. 

Certain distributors have limited stock rotation rights that permit the return of a small percentage of the previous six months’ purchases in accordance with the contract terms. We estimate the stock rotation returns using the expected value method based on an analysis of historical returns, and the current level of inventory in the distribution channel. 

Overall, our estimates of adjustments to contract price due to variable consideration have been materially consistent with actual results; however, these estimates are subject to management’s judgment and actual provisions could be different from our estimates and current provisions, resulting in future adjustments to our revenue and operating results.

Inventory Valuation

Inventories are stated at the lower of standard cost (which approximates actual cost determined on a first-in first-out basis) and estimated net realizable value. We write down excess and obsolete inventories based on their age and forecasted demand, which includes estimates taking into consideration our revenue forecast, outlook on market and economic conditions, technology changes, new product introductions and changes in strategic direction. If actual demand or market conditions are less favorable than those projected by management, additional inventory write-downs may be required. Conversely, if actual demand or market conditions are more favorable, inventories may be sold that were previously written down. 

Accounting for Income Taxes 

Our calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments and involves dealing with uncertainties in the application of complex tax laws. Our estimates of current and deferred tax assets and liabilities may change based, in part, on added certainty, finality or uncertainty to an anticipated outcome, changes in accounting or tax laws in the U.S. or foreign jurisdictions where we operate, or changes in other facts or circumstances. In addition, we recognize liabilities for potential U.S. and foreign income tax for uncertain income tax positions taken on our tax returns if it has less than a 50% likelihood of being sustained. If we determine that payment of these amounts is unnecessary or if the recorded tax liability is less than our current assessment, we may be required to recognize an income tax benefit or additional income tax expense in our financial statements in the period such determination is made.  

As of December 31, 2023 and 2022, we had a valuation allowance of $35.0 million and $20.3 million, respectively, attributable to management’s determination that it is more likely than not that certain deferred tax assets will not be fully realized. In the event we determine that it is more likely than not that we would be able to realize the deferred tax assets in the future in excess of our net recorded amount, an adjustment to the valuation allowance for the deferred tax assets would increase income in the period such determination was made. Likewise, should it be determined that additional amounts of the net deferred tax assets will not be realized in the future, an adjustment to increase the deferred tax assets valuation allowance will be charged to income in the period such determination is made.

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Contingencies

We record a contingent liability related to pending legal and regulatory proceedings when it is probable that a loss has been incurred and the amount is reasonably estimable. Based on the facts and circumstances in each matter, the determination of such liability requires significant judgment. In determining the amount of a contingent loss, we take into account advice received from experts for each specific matter regarding the status of legal proceedings, settlement negotiations, prior case history and other factors. Should the judgments and estimates made by management need to be adjusted as additional information becomes available, we may need to record additional contingent losses that could materially and adversely impact our results of operations. Alternatively, if the judgments and estimates made by management are adjusted, for example, if a particular contingent loss does not occur, the contingent loss recorded would be reversed which could result in a favorable impact on our results of operations.

Stock-Based Compensation

For equity awards with performance conditions, as well as awards containing both market and performance conditions, we recognize compensation expense when it becomes probable that the performance goals will be achieved. Management performs the probability assessment on a quarterly basis by reviewing external factors, such as macroeconomic conditions and the analog industry revenue forecasts, and internal factors, such as our business and operational objectives and revenue forecasts. Changes in the probability assessment of achievement of the performance conditions are accounted for in the period of change by recording a cumulative catch-up adjustment as if the new estimate had been applied since the service inception date. If the projected achievement was revised upward or if the actual results were higher than the projected achievement, additional compensation expense would be recorded for the awards due to the cumulative catch-up adjustment, which would have an adverse impact on our results of operations. Conversely, if the projected achievement was revised downward or if the actual results were lower than the projected achievement, previously accrued compensation expense would be reversed for the awards, which would have a favorable impact on our results of operations. As a result, our stock-based compensation expense is subject to volatility and may fluctuate significantly each quarter due to changes in our probability assessment of achievement of the performance conditions or actual results being different from projections made by management.

Recent Accounting Pronouncements

See Note 1 of the Notes to Consolidated Financial Statements regarding a recently adopted accounting pronouncement and recent accounting pronouncements not yet adopted as of December 31, 2023.

Results of Operations

The following table summarizes our results of operations:

	Year Ended December 31,
	2023				2022					2021
	(in thousands, except percentages)
Revenue	$	1,821,072	100.0	%	$	1,794,148		100.0	%	$	1,207,798	100.0	%
Cost of revenue		799,953	43.9			745,596		41.6			522,339	43.2
Gross profit		1,021,119	56.1			1,048,552		58.4			685,459	56.8
Operating expenses:
Research and development		263,643	14.5			240,171		13.4			190,627	15.8
Selling, general and administrative		275,740	15.1			281,596		15.6			232,415	19.3
Total operating expenses		539,383	29.6			521,767		29.0			423,042	35.1
Operating income		481,736	26.5			526,785		29.4			262,417	21.7
Other income (expense), net		24,105	1.3			(1,848	)	(0.1	)		9,802	0.8
Income before income taxes		505,841	27.8			524,937		29.3			272,219	22.5
Income tax expense		78,467	4.3			87,265		4.9			30,196	2.5
Net income	$	427,374	23.5	%	$	437,672		24.4	%	$	242,023	20.0	%

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Revenue

The following table summarizes our revenue by end market:

	Year Ended December 31,
End Market	2023		% of Revenue			2022		% of Revenue			2021		% of Revenue
	(in thousands, except percentages)
Storage and Computing	$	491,139		27.0	%	$	452,594		25.3	%	$	255,933		21.2	%
Enterprise Data		322,980		17.7			251,415		14.0			116,345		9.6
Automotive		394,665		21.7			300,016		16.7			204,335		16.9
Industrial		172,717		9.4			219,179		12.2			184,784		15.3
Communications		204,911		11.3			251,452		14.0			164,091		13.6
Consumer		234,660		12.9			319,492		17.8			282,310		23.4
Total	$	1,821,072		100.0	%	$	1,794,148		100.0	%	$	1,207,798		100.0	%

Revenue for the year ended December 31, 2023 was $1,821.1 million, an increase of $27.0 million, or 1.5%, from $1,794.1 million for the year ended December 31, 2022. The increase in revenue was primarily due to increases in the average selling prices resulting primarily from product mix, partially offset by lower shipment volume.

For the year ended December 31, 2023, revenue from the storage and computing market increased $38.5 million, or 8.5%, from the same period in 2022. This increase was primarily driven by increased sales of products for notebooks. Revenue from the enterprise data market increased $71.6 million, or 28.5%, from the same period in 2022. This increase was primarily due to higher sales of our power management solutions for AI applications. Revenue from the automotive market increased $94.6 million, or 31.5%, from the same period in 2022. This increase was primarily driven by increased sales of our highly integrated applications supporting advanced driver assistance systems, body electronics and the digital cockpit. Revenue from the industrial market decreased $46.5 million, or 21.2%, from the same period in 2022. This decrease primarily reflected lower sales in applications for industrial automation, security and power sources. Revenue from the communications market decreased $46.5 million, or 18.5%, from the same period in 2022. The decrease was a result of lower 4G and 5G infrastructure sales. Revenue from the consumer market decreased $84.8 million, or 26.6%, from the same period in 2022. This decrease was a result of broad market weakness across all segments.

Cost of Revenue and Gross Margin 

Cost of revenue primarily consists of costs incurred to manufacture, assemble and test our products, as well as warranty costs, inventory-related and other overhead costs, and stock-based compensation expenses. 

	Year Ended December 31,
	2023			2022			2021
	(in thousands, except percentages)
Cost of revenue	$	799,953		$	745,596		$	522,339
As a percentage of revenue		43.9	%		41.6	%		43.2	%
Gross profit	$	1,021,119		$	1,048,552		$	685,459
Gross margin		56.1	%		58.4	%		56.8	%

Cost of revenue was $800.0 million, or 43.9% of revenue, for the year ended December 31, 2023, and $745.6 million, or 41.6% of revenue, for the year ended December 31, 2022. The $54.4 million increase in cost of revenue was primarily driven by product mix, partially offset by lower inventory write-downs and warranty expenses.

Gross margin was 56.1% for the year ended December 31, 2023, compared with 58.4% for the year ended December 31, 2022. The decrease in gross margin was mainly driven by product mix, partially offset by lower inventory write-downs and warranty expenses as a percentage of revenue.

Research and Development (“R&D”)

R&D expenses primarily consist of cash compensation and benefits, stock-based compensation and deferred compensation for design and product engineers, expenses related to new product development and supplies, and facility costs.   

	Year Ended December 31,
	2023			2022			2021
	(in thousands, except percentages)
R&D expenses	$	263,643		$	240,171		$	190,627
As a percentage of revenue		14.5	%		13.4	%		15.8	%

R&D expenses were $263.6 million, or 14.5% of revenue, for the year ended December 31, 2023, and $240.2 million, or 13.4% of revenue, for the year ended December 31, 2022. The $23.5 million increase in R&D expenses was primarily due to a $20.9 million increase in new product development expenses, a $5.6 million increase in expenses related to changes in the value of deferred compensation plan liabilities and a $1.8 million increase in depreciation. This increase was partially offset by an $8.1 million decrease in cash compensation expenses, which was driven by decreased bonuses.

37

Selling, General and Administrative (“SG&A”)

SG&A expenses primarily include cash compensation and benefits, stock-based compensation and deferred compensation for sales, marketing and administrative personnel, sales commissions, travel expenses, facilities costs, third party service fees and litigation expenses. 

	Year Ended December 31,
	2023			2022			2021
	(in thousands, except percentages)
SG&A expenses	$	275,740		$	281,596		$	232,415
As a percentage of revenue		15.1	%		15.6	%		19.3	%

SG&A expenses were $275.7 million, or 15.1% of revenue, for the year ended December 31, 2023, and $281.6 million, or 15.6% of revenue, for the year ended December 31, 2022. The $5.9 million decrease in SG&A expenses was driven by a $12.4 million decrease in stock-based compensation expenses, an $8.8 million decrease in cash compensation expenses driven by decreased bonuses, and a $3.1 million decrease in litigation expenses. This decrease was partially offset by a $10.1 million increase in expenses related to changes in the value of the deferred compensation plan liabilities, and an $8.2 million increase consisting mostly of travel related expenses, third party service expenses and software licensing fees.

Other Income (Expense), Net

Other income, net, was $24.1 million for the year ended December 31, 2023, compared with other expense, net, of $1.8 million for the year ended December 31, 2022. The increase in other income was primarily due to an increase of $18.6 million in net interest income as a result of higher interest rates, and an increase of $15.1 million in income related to changes in the value of deferred compensation plan investments, partially offset by an increase of $9.0 million in charitable contributions.

Income Tax Expense

The income tax expense for the year ended December 31, 2023 was $78.5 million, or 15.5% of pre-tax income. The effective tax rate was lower than the federal statutory rate of 21% primarily due to foreign income from our subsidiaries in Bermuda and China being taxed at lower statutory tax rates and a return to provision true-up adjustment which primarily resulted from a calculation refinement of our capitalization of research and experimental expenditures under Section 174 of the Internal Revenue Code (the “IRC”). The decrease in the effective tax rate relative to the federal statutory rate was partially offset by the inclusion of the global intangible low-taxed income (“GILTI”) tax, the addition of a valuation allowance against China deferred tax assets arising from the indefinite extension of the R&D super deduction policy in China, and excess tax benefits from stock-based compensation.

The income tax expense for the year ended December 31, 2022 was $87.3 million, or 16.6% of pre-tax income. The effective tax rate was lower than the federal statutory rate of 21% primarily due to foreign income from our subsidiaries in Bermuda and China being taxed at lower statutory tax rates, and excess tax benefits from stock-based compensation. The decrease in the effective tax rate relative to the federal statutory rate was partially offset by the inclusion of the GILTI tax.

In December 2023, the Bermuda Corporate Income Tax Act of 2023 (the “Bermuda CIT Act”) was enacted and signed into law. The Bermuda CIT Act includes a 15% corporate income tax (“CIT”) applicable to Bermuda businesses that are multinational enterprise (“MNE”) groups with annual revenue of €750M or more beginning in 2025. The Bermuda CIT Act also includes an Economic Transition Adjustment (“ETA”) that requires MNE’s to revalue their assets and liabilities, excluding goodwill, at their fair value as of September 30, 2023. There is an election to opt out of the ETA. As the Bermuda CIT Act is not effective until January 1, 2025, we are evaluating whether or not to adopt this ETA. Based on information available, we have not recorded any changes to income tax expense related to the Bermuda CIT Act as of December 31, 2023.

In August 2022, the CHIPS Act and the Inflation Reduction Act of 2022 (the “IRA”) were enacted and signed into law, which did not have a material impact on our income tax provisions, results of operations or financial condition for the years ended December 31, 2023 or 2022. We will continue to monitor any new developments related to the CHIPS Act and the IRA and evaluate their impact on our financial statements.

See Note 11 of the Notes to Consolidated Financial Statements for further discussion.

38

Liquidity and Capital Resources

	December 31,
	2023			2022
	(in thousands, except percentages)
Cash and cash equivalents	$	527,843		$	288,607
Short-term investments		580,633			449,266
Total cash, cash equivalents and short-term investments	$	1,108,476		$	737,873
Percentage of total assets		45.5	%		35.8	%
Total current assets	$	1,819,499		$	1,410,619
Total current liabilities		(235,035	)		(263,400	)
Working capital	$	1,584,464		$	1,147,219

As of December 31, 2023, we had cash and cash equivalents of $527.8 million and short-term investments of $580.6 million, compared with cash and cash equivalents of $288.6 million and short-term investments of $449.3 million as of December 31, 2022. As of December 31, 2023, $369.9 million of cash and cash equivalents and $528.0 million of short-term investments were held by our international subsidiaries. For the year ended December 31, 2023, we repatriated $140 million of cash from our Bermuda subsidiary to the U.S. with minimal tax impact. The proceeds are primarily used to fund our ongoing business operations. We may repatriate additional cash from our Bermuda subsidiary to fund our expenditures in future periods. We anticipate that earnings from other foreign subsidiaries will continue to be indefinitely reinvested.

Summary of Cash Flows 

The following table summarizes our cash flow activities:

	Year Ended December 31,
	2023			2022			2021
	(in thousands)
Net cash provided by operating activities	$	638,213		$	246,674		$	320,010
Net cash used in investing activities		(178,726	)		(12,510	)		(378,886	)
Net cash used in financing activities		(183,725	)		(128,785	)		(90,206	)
Effect of change in exchange rates		(3,310	)		(6,039	)		3,400
Net increase (decrease) in cash, cash equivalents and restricted cash	$	272,452		$	99,340		$	(145,682	)

For the year ended December 31, 2023, the $391.5 million increase in cash provided by operating activities compared to the prior period was primarily due to decreased inventory purchases, decreased prepaid wafer expenses, increased accounts receivable collections and other changes in working capital.

For the year ended December 31, 2023, the $166.2 million increase in cash used in investing activities compared to the prior period was primarily due to an increase of $518.9 million in purchases of investments, partially offset by an increase of $340.4 million in sales of investments.

For the year ended December 31, 2023, the $54.9 million increase in cash used in financing activities compared to the prior period was primarily due to a $47.9 million increase in dividend and dividend equivalent payments.

Cash Requirements

Although consequences of economic uncertainty and macroeconomic conditions and other factors could adversely affect our liquidity and capital resources in the future, and cash requirements may fluctuate based on the timing and extent of many factors such as those discussed above, we believe that our balances of cash, cash equivalents and short-term investments of $1,108.5 million as of December 31, 2023, along with cash generated by ongoing operations, will be sufficient to satisfy our liquidity requirements for the next 12 months and beyond.

Our material cash requirements include the following contractual and other obligations:

Purchase Obligations

Purchase obligations represent commitments to our suppliers and other parties requiring the purchases of goods or services. Our purchase obligations primarily consist of wafer and other inventory purchases, assembly and other manufacturing services, construction of manufacturing and R&D facilities, purchases of production and other equipment, and license arrangements.

In May 2022, we entered into a long-term supply agreement in order to secure manufacturing production capacity for silicon wafers over a four-year period. As of December 31, 2023, we had remaining prepayments under this agreement of $120.0 million reported in other long-term assets on the Consolidated Balance Sheet.

As of December 31, 2023, total estimated future unconditional purchase commitments to all suppliers and other parties, net of the $120.0 million prepayment, were $699.7 million, of which $367.8 million was classified as short-term.

39

Transition Tax Liability

The transition tax liability represents the one-time, mandatory deemed repatriation tax imposed on previously deferred foreign earnings under the U.S. Tax Cuts and Jobs Act enacted in December 2017 (the “2017 Tax Act”). As permitted by the 2017 Tax Act, we have elected to pay the tax liability in installments on an interest-free basis through 2025. As of December 31, 2023, the remaining liability totaled $11.1 million, of which $4.9 million was short-term.

Operating Leases

Operating lease obligations represent the undiscounted remaining lease payments primarily for our leased facilities and equipment. As of December 31, 2023, these obligations totaled $7.9 million, of which $2.3 million was short-term.

Capital Return to Stockholders

In October 2023, our Board of Directors approved a new stock repurchase program authorizing us to repurchase up to $640.0 million in the aggregate of our common stock through October 29, 2026. Shares are retired upon repurchase. We repurchased approximately 7,000 shares of our common stock for an aggregate purchase price of $3.7 million during the year ended December 31, 2023. As of December 31, 2023, $636.3 million remained available for future repurchases under the program.

We currently have a dividend program approved by our Board of Directors, pursuant to which we intend to pay quarterly cash dividends on our common stock. Based on our historical practice, stockholders of record as of the last business day of the quarter are entitled to receive the quarterly cash dividends when and if declared by the Board of Directors, which are payable to the stockholders in the following month. As of December 31, 2023, accrued dividends totaled $47.9 million. The declaration of any future cash dividends is at the discretion of our Board of Directors and will depend on, among other things, our financial condition, results of operations, capital requirements, business conditions and other factors that our Board of Directors may deem relevant, as well as a determination that cash dividends are in the best interests of our stockholders.

In February 2024, our Board of Directors approved an increase in the quarterly cash dividend from $1.00 per share to $1.25 per share, which amount will be paid on April 15, 2024 to all stockholders of record as of the close of business on March 29, 2024.

Other Long-Term Obligations

Other long-term obligations primarily include payments for deferred compensation plan liabilities and accrued dividend equivalents. As of December 31, 2023, these obligations totaled $83.1 million.

Acquisition

On January 3, 2024, we acquired Axign, a Dutch company for $33.8 million in cash. See Note 17 of the Notes to Consolidated Financial Statements included in Item 8 of this Annual Report on Form 10-K for additional information.

Item 7A. Quantitative and Qualitative Disclosures about Market Risk

Interest Rate Risk

Our cash equivalents and short-term investments are subject to market risk, primarily interest rate and credit risk. Our investments are managed by outside professional managers within investment guidelines set by management and approved by the Audit Committee of the Board of Directors. Such guidelines include security type, credit quality and maturity and are intended to limit market risk by restricting our investments to high quality debt instruments with relatively short-term maturities. Based on our investment positions as of December 31, 2023, the impact of changes in interest rates on our interest income was immaterial.

Investments in debt securities are classified as available-for-sale, which are reported at fair value with the unrealized gains or losses being included in accumulated other comprehensive loss on the Consolidated Balance Sheets. When the fair value of an investment is below its amortized cost basis, unrealized losses due to changes in interest rates (i.e., non-credit loss factors) are not recognized in our results of operations unless we have the intent to sell the securities or it is more likely than not that we will be required to sell the securities before recovery of the entire amortized cost basis. Based on our investment positions as of December 31, 2023, a hypothetical 100 basis point increase in interest rates would result in a $4.5 million decline in the fair value of our investments. Any losses resulting from such interest rate changes would only be realized if we sold the investments prior to maturity.

We do not use derivative financial instruments in our investment portfolio.

Foreign Currency Exchange Risk

Our sales outside the United States are primarily transacted in U.S. dollars through our subsidiary in Bermuda. Accordingly, our sales are not generally impacted by foreign currency rate changes. The functional currency of our offshore operations is generally the local currency, primarily including the Renminbi, the New Taiwan Dollar and the Euro. We incur foreign currency exchange gains or losses related to certain transactions, including intercompany transactions between the U.S. and our foreign subsidiaries, that are denominated in a currency other than the functional currency. Gains or losses from the remeasurement and settlement of the balances are reported in other income (expense), net, on the Consolidated Statements of Operations. Fluctuations in foreign currency exchange rates have not had a material impact on our results of operations for the periods presented.

40

Item 8. Financial Statements and Supplementary Data

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED FINANCIAL STATEMENTS

Contents

	Page
Reports of Independent Registered Public Accounting Firm (PCAOB ID: 42)	42
Consolidated Balance Sheets	44
Consolidated Statements of Operations	45
Consolidated Statements of Comprehensive Income	46
Consolidated Statements of Stockholders’ Equity	47
Consolidated Statements of Cash Flows	48
Notes to Consolidated Financial Statements	49

41

Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Monolithic Power Systems, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Monolithic Power Systems, Inc. (the Company) as of December 31, 2023 and 2022, the related consolidated statements of operations, comprehensive income, stockholders’ 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, 2023 and 2022, 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 U.S. generally accepted accounting principles.

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 February 29, 2024 expressed an adverse 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 the 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.

	Inventory Valuation
Description of the Matter	The Company’s inventories totaled $383.7 million as of December 31, 2023, representing 15.8% of total assets. As explained in Note 1 to the consolidated financial statements, the Company values inventories at the lower of standard cost (which approximates actual cost determined on a first-in first-out basis) and estimated net realizable value in each reporting period. Excess and obsolete inventory is written down to its estimated net realizable value if less than cost.
	Auditing management’s estimates for excess and obsolete inventory involved subjective auditor judgment because management’s assessment of whether a write down is required and the measurement of any excess of cost over net realizable value is judgmental and considers a number of qualitative factors that are affected by market and economic conditions outside the Company’s control. In particular, determination of excess and obsolete inventory utilizes assumptions, including estimated demand for the Company’s products, new product launches, expected industry sales growth, and product lifecycle.
How We Addressed the Matter in Our Audit	Our audit procedures included, among others, evaluating the significant assumptions stated above and testing the completeness and accuracy of the underlying data used in management’s excess and obsolete inventory valuation assessment. We evaluated inventory levels compared to forecasted product demand, historical sales and specific product considerations. We also assessed the historical accuracy of management’s estimates and performed sensitivity analyses over the significant assumptions to evaluate the changes in the excess and obsolete inventory estimates that would result from changes in the underlying assumptions.

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2019.

San Jose, California  

February 29, 2024

42

Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Monolithic Power Systems, Inc.

Opinion on Internal Control Over Financial Reporting

We have audited Monolithic Power Systems, Inc.’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) (the COSO criteria). In our opinion, because of the effect of the material weakness described below on the achievement of the objectives of the control criteria, Monolithic Power Systems, Inc. (the Company) has not maintained effective internal control over financial reporting as of December 31, 2023, based on the COSO criteria.

A material weakness is a deficiency, or combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the company’s annual or interim financial statements will not be prevented or detected on a timely basis. The following material weakness has been identified and included in management’s assessment. A material weakness was identified in controls related to the company’s inventory demand forecasting process.

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, 2023 and 2022, the related consolidated statements of operations, comprehensive income, stockholders’ equity and cash flows for each of the three years in the period ended December 31, 2023, and the related notes. This material weakness was considered in determining the nature, timing and extent of audit tests applied in our audit of the 2023 consolidated financial statements, and this report does not affect our report dated February 29, 2024, which 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 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.

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 LLP

San Jose, California

February 29, 2024

43

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands, except par value)

	December 31,
	2023			2022
ASSETS
Current assets:
Cash and cash equivalents	$	527,843		$	288,607
Short-term investments		580,633			449,266
Accounts receivable, net		179,858			182,714
Inventories		383,702			447,290
Other current assets		147,463			42,742
Total current assets		1,819,499			1,410,619
Property and equipment, net		368,952			357,157
Goodwill		6,571			6,571
Deferred tax assets, net		28,054			35,252
Other long-term assets		211,277			249,286
Total assets	$	2,434,353		$	2,058,885
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	62,958		$	61,461
Accrued compensation and related benefits		56,286			88,260
Other accrued liabilities		115,791			113,679
Total current liabilities		235,035			263,400
Income tax liabilities		60,724			53,509
Other long-term liabilities		88,655			73,374
Total liabilities		384,414			390,283
Commitments and contingencies
Stockholders’ equity:
Common stock and additional paid-in capital: $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 48,028 and 47,107, respectively		1,129,937			975,276
Retained earnings		947,064			716,403
Accumulated other comprehensive loss		(27,062	)		(23,077	)
Total stockholders’ equity		2,049,939			1,668,602
Total liabilities and stockholders’ equity	$	2,434,353		$	2,058,885

See accompanying notes to consolidated financial statements.

44

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share amounts)

	Year Ended December 31,
	2023		2022			2021
Revenue	$	1,821,072	$	1,794,148		$	1,207,798
Cost of revenue		799,953		745,596			522,339
Gross profit		1,021,119		1,048,552			685,459
Operating expenses:
Research and development		263,643		240,171			190,627
Selling, general and administrative		275,740		281,596			232,415
Total operating expenses		539,383		521,767			423,042
Operating income		481,736		526,785			262,417
Other income (expense), net		24,105		(1,848	)		9,802
Income before income taxes		505,841		524,937			272,219
Income tax expense		78,467		87,265			30,196
Net income	$	427,374	$	437,672		$	242,023
Net income per share:
Basic	$	8.98	$	9.37		$	5.28
Diluted	$	8.76	$	9.05		$	5.05
Weighted-average shares outstanding:
Basic		47,610		46,727			45,851
Diluted		48,771		48,358			47,889

See accompanying notes to consolidated financial statements.

45

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands) 

	Year Ended December 31,
	2023			2022			2021
Net income	$	427,374		$	437,672		$	242,023
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		(9,528	)		(32,293	)		8,404
Change in unrealized gains and losses on available-for-sale securities, net of tax of $(1,352), $184 and $613, respectively		5,543			(6,664	)		(2,664	)
Other comprehensive income (loss), net of tax		(3,985	)		(38,957	)		5,740
Comprehensive income	$	423,389		$	398,715		$	247,763

See accompanying notes to consolidated financial statements.

46

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands, except per share amounts) 

										Accumulated
	Common Stock and									Other			Total
	Additional Paid-in Capital						Retained			Comprehensive			Stockholders’
	Shares			Amount			Earnings			Income (Loss)			Equity
Balance as of January 1, 2021		45,267		$	657,701		$	298,746		$	10,140		$	966,587
Net income		-			-			242,023			-			242,023
Other comprehensive income		-			-			-			5,740			5,740
Dividends and dividend equivalents declared ($2.40 per share)		-			-			(115,890	)		-			(115,890	)
Common stock issued under the employee equity incentive plan		972			17,322			-			-			17,322
Common stock issued under the employee stock purchase plan		17			4,670			-			-			4,670
Stock-based compensation expense		-			123,533			-			-			123,533
Balance as of December 31, 2021		46,256			803,226			424,879			15,880			1,243,985
Net income		-			-			437,672			-			437,672
Other comprehensive loss		-			-			-			(38,957	)		(38,957	)
Dividends and dividend equivalents declared ($3.00 per share)		-			-			(146,148	)		-			(146,148	)
Common stock issued under the employee equity incentive plan		837			5,358			-			-			5,358
Common stock issued under the employee stock purchase plan		14			5,877			-			-			5,877
Stock-based compensation expense		-			160,815			-			-			160,815
Balance as of December 31, 2022		47,107			975,276			716,403			(23,077	)		1,668,602
Net income		-			-			427,374			-			427,374
Other comprehensive loss		-			-			-			(3,985	)		(3,985	)
Dividends and dividend equivalents declared ($4.00 per share)		-			-			(196,713	)		-			(196,713	)
Common stock issued under the employee equity incentive plan		911			1,118			-			-			1,118
Common stock issued under the employee stock purchase plan		17			7,568			-			-			7,568
Repurchase of common stock		(7	)		(3,741	)		-			-			(3,741	)
Stock-based compensation expense		-			149,716			-			-			149,716
Balance as of December 31, 2023		48,028		$	1,129,937		$	947,064		$	(27,062	)	$	2,049,939

See accompanying notes to consolidated financial statements.

47

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended December 31,
	2023			2022			2021
Cash flows from operating activities:
Net income	$	427,374		$	437,672		$	242,023
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		40,168			37,114			28,699
Amortization of premium (discount) on available-for-sale securities		(5,277	)		4,375			4,674
Loss (gain) on deferred compensation plan investments		(8,505	)		6,600			(4,563	)
Deferred taxes, net		5,865			(13,220	)		(2,772	)
Gain on sale of equity investment		(1,424	)		-			-
Stock-based compensation expense		149,711			160,992			123,479
Other		(23	)		97			110
Changes in operating assets and liabilities:
Accounts receivable		2,884			(77,903	)		(37,976	)
Inventories		63,583			(188,073	)		(102,323	)
Other assets		(24,310	)		(177,284	)		(15,311	)
Accounts payable		4,797			(11,240	)		32,926
Accrued compensation and related benefits		(31,187	)		28,514			16,536
Income tax liabilities		(308	)		16,559			11,771
Other accrued liabilities		14,865			22,471			22,737
Net cash provided by operating activities		638,213			246,674			320,010
Cash flows from investing activities:
Purchases of property and equipment		(57,578	)		(58,843	)		(94,420	)
Purchases of investments		(582,603	)		(65,785	)		(394,886	)
Maturities and sales of investments		468,308			128,610			113,755
Contributions to deferred compensation plan, net		(6,853	)		(16,492	)		(2,542	)
Purchases of intangible assets		-			-			(793	)
Net cash used in investing activities		(178,726	)		(12,510	)		(378,886	)
Cash flows from financing activities:
Property and equipment purchased on extended payment terms		(2,826	)		(2,055	)		(2,834	)
Proceeds from common stock issued under the employee equity incentive plan		1,118			5,358			17,322
Proceeds from common stock issued under the employee stock purchase plan		7,568			5,877			4,670
Repurchase of common stock		(3,741	)		-			-
Dividends and dividend equivalents paid		(185,844	)		(137,965	)		(109,364	)
Net cash used in financing activities		(183,725	)		(128,785	)		(90,206	)
Effect of change in exchange rates		(3,310	)		(6,039	)		3,400
Net increase (decrease) in cash, cash equivalents and restricted cash		272,452			99,340			(145,682	)
Cash, cash equivalents and restricted cash, beginning of period		288,729			189,389			335,071
Cash, cash equivalents and restricted cash, end of period	$	561,181		$	288,729		$	189,389
Supplemental disclosures for cash flow information:
Cash paid for income taxes, net	$	85,128		$	85,031		$	21,148
Non-cash investing and financing activities:
Liability accrued for property and equipment purchases	$	1,784		$	5,743		$	17,877
Liability accrued for dividends and dividend equivalents	$	53,213		$	40,939		$	33,059

See accompanying notes to consolidated financial statements.

48

MONOLITHIC POWER SYSTEMS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Business

Monolithic Power Systems, Inc. (the “Company”) was incorporated in the State of California on August 22, 1997. On November 17, 2004, the Company was reincorporated in the State of Delaware. MPS designs, develops and markets high-performance, semiconductor-based power electronic solutions. MPS’s mission is to provide innovative power solutions in the storage and computing, enterprise data, automotive, industrial, communications and consumer markets.

Basis of Presentation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions used in these consolidated financial statements primarily include those related to revenue recognition, inventory valuation, valuation of share-based awards, contingencies and income tax valuation allowances. Actual results could differ from these estimates and assumptions, and any such differences  may be material to the Company’s consolidated financial statements. 

Certain Significant Risks and Uncertainties

Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash equivalents, short-term and long-term investments and accounts receivable. The Company’s cash equivalents include short-term, highly liquid investments purchased with remaining maturities at the date of purchase of three months or less. The Company’s short-term investments may consist of corporate debt securities, certificates of deposit, commercial paper and government agency bonds and treasuries, and the long-term investments consist of government-backed student loan auction-rate securities.

The Company does not require its customers to provide collateral to support accounts receivable. The Company assesses the collectability by reviewing accounts receivable on a customer-by-customer basis. To manage credit risk, management performs ongoing credit evaluations of the customers’ financial condition, monitors payment performance, and assesses current economic conditions, as well as reasonable and supportable forecasts of future economic conditions, that  may affect collectability of the outstanding receivables. For certain high-risk customers, the Company requires standby letters of credit or advance payment prior to shipments of goods.

The Company participates in the dynamic high technology industry and believes that changes in any of the following areas could have a material adverse effect on its future financial position, results of operations or cash flows: advances and trends in new technologies and industry standards; competitive pressures in the form of new products or price reductions on current products; changes in product mix; changes in the overall demand for products offered by the Company or in specific markets; changes in third-party manufacturers or the terms of such arrangements; changes in key suppliers; changes in certain strategic relationships or customer relationships; litigation or claims against the Company based on intellectual property, patent, product, regulatory or other factors; fluctuations in foreign currency exchange rates; risk associated with changes in government policies and regulations on trade restrictions and corporate taxes; availability of necessary components or sub-assemblies; availability of foundry capacity; ability to integrate acquired companies; and the Company’s ability to attract and retain employees necessary to support its growth.

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Foreign Currency  

In general, the functional currency of the Company’s international subsidiaries is the local currency. The primary subsidiaries are located in China, Taiwan and Europe, which utilize the Renminbi, the New Taiwan Dollar and the Euro as their currencies, respectively. Accordingly, assets and liabilities of the foreign subsidiaries are translated using exchange rates in effect at the end of the period. Revenue and costs are translated using average exchange rates for the period. The resulting translation adjustments are recorded in accumulated other comprehensive loss on the Consolidated Balance Sheets.

In addition, the Company incurs foreign currency exchange gains or losses related to certain transactions, including intercompany transactions, that are denominated in a currency other than the functional currency. In connection with the remeasurement and settlement of the balances, the Company recorded foreign currency exchange gain (loss) of $(0.2) million, $0.5 million and $(0.7) million for the years ended December 31, 2023, 2022 and 2021, respectively, which were reported in other income (expense), net, on the Consolidated Statements of Operations.

For intercompany transactions that are of a long-term investment nature, the Company records the foreign currency exchange gains and losses in accumulated other comprehensive loss on the Consolidated Balance Sheets.

Cash Equivalents and Debt Investments 

The Company classifies all highly liquid investments with stated maturities of three months or less from date of purchase as cash equivalents. The Company may classify investments with maturities beyond one year as short-term based on the nature of the investments and their availability for use in current operations.

Cash equivalents are stated at cost, which approximates fair market value. The Company’s short-term and long-term debt investments are classified as available-for-sale securities and are stated at their fair market value, with unrealized gains and losses recorded in accumulated other comprehensive loss on the Consolidated Balance Sheets. Premiums and discounts on debt investments are generally amortized or accreted over the life of the related available-for-sale securities. Interest income is recognized when earned. The cost of investments sold is determined on the basis of the specific identification method.

Available-for-sale investments are subject to impairment reviews when the fair value is below the amortized cost basis. If the Company determines that the decline in fair value below the amortized cost basis is due to credit-related factors, the impairment is recognized as an allowance on the Consolidated Balance Sheets with a corresponding adjustment to earnings. An impairment that is not credit-related is recognized in accumulated other comprehensive loss on the Consolidated Balance Sheets. If the Company intends to sell the impaired investments, or more likely than not will be required to sell such investments before recovering the amortized cost basis, the entire impairment amount is recognized in earnings with a corresponding adjustment to the amortized cost basis.

Equity Investments

Equity investments in privately held companies without readily determinable fair values are accounted for under the measurement alternative method, provided that the Company does not have the ability to exercise significant influence or control over the investees. Under this method, the Company measures the investments at cost, less any impairment, and adjusts the carrying value of the investments to fair value resulting from observable transactions for identical or similar investments of the same issuer. The Company records the investments in other long-term assets on the Consolidated Balance Sheets, and gains and losses on the investments are recognized in other income (expense), net, on the Consolidated Statements of Operations.

The Company monitors its non-marketable equity investments for impairment indicators, such as negative changes in industry and market conditions, financial performance, business prospects, and other relevant events and factors. If indicators exist for a security and the fair value is below the carrying amount, the Company writes down the security to fair value.

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Fair Value of Financial Instruments

Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value, the Company considers the principal or most advantageous market in which the Company would transact, as well as assumptions that market participants would use when pricing the assets or liabilities. Fair value is estimated by applying the fair value hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement. See Note 4 for additional information on the fair value of the Company’s financial instruments.

Inventories

Inventories are stated at the lower of standard cost (which approximates actual cost determined on a first-in first-out basis) and estimated net realizable value. The Company writes down excess and obsolete inventories based on their age and forecasted demand, which includes estimates taking into consideration the Company’s revenue forecast, outlook on market and economic conditions, technology changes, new product introductions and changes in strategic direction. Actual demand may differ from forecasted demand, and such a difference  may have a material effect on recorded inventory values. When the Company records a write-down on inventory, it establishes a new, lower cost basis for that inventory, and subsequent changes in facts and circumstances will not result in the restoration or increase in that newly established cost basis.

Property and Equipment

Property and equipment are stated at cost. Depreciation commences when an asset is placed in service and available for its intended use. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Buildings and building improvements have estimated useful lives of 20 to 40 years. Leasehold improvements are amortized over the shorter of the estimated useful lives or the lease period. Production equipment, lab equipment and software have estimated useful lives of three to eight years. Transportation equipment has estimated useful lives of 5 to 20 years. Furniture and fixtures have estimated useful lives of three to five years. Land is not depreciated.

Impairment of Long-Lived Assets

The Company evaluates its long-lived assets other than goodwill for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss would be recognized when the sum of the undiscounted future net cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount. Such impairment loss would be measured as the difference between the carrying amount of the asset and its fair value based on the present value of estimated future cash flows. The Company did not record material impairments in any of the periods presented.

Goodwill

Goodwill represents the excess of the fair value of purchase consideration over the fair value of net tangible and identified intangible assets as of the date of acquisition. Goodwill is not amortized.

The Company tests goodwill for impairment at least annually in the fourth quarter of each year, or whenever events or changes in circumstances indicate that goodwill may be impaired. The Company has elected to first assess the qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines that it is more likely than not that the fair value of the reporting unit is less than the carrying amount, then a quantitative goodwill impairment test is performed to measure the impairment loss. No impairment of goodwill has been identified in any of the periods presented.  

Deferred Compensation Plan 

The Company has a non-qualified, unfunded deferred compensation plan, which provides certain key employees, including executive officers, with the ability to defer the receipt of compensation in order to accumulate funds for retirement on a tax deferred basis. The Company does not make contributions to the plan or guarantee returns on the investments. The Company is responsible for the plan’s administrative expenses. Participants’ deferrals and investment gains and losses remain as the Company’s liabilities and the underlying assets are subject to claims of general creditors.

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The liabilities for compensation deferred under the plan are recorded at fair value as of the end of each reporting period. Changes in the fair value of the liabilities are included in operating expenses on the Consolidated Statements of Operations. The Company manages the risk of changes in the fair value of the liabilities by electing to match the liabilities with investments in corporate-owned life insurance policies, mutual funds and money market funds that offset a substantial portion of the exposure. The investments are recorded at the cash surrender value of the corporate-owned life insurance policies, and at the fair value of the mutual funds and money market funds, which are classified as trading securities. Changes in the cash surrender value of the corporate-owned life insurance policies and the fair value of mutual fund and money market fund investments are included in other income (expense), net, on the Consolidated Statements of Operations. The following table summarizes the deferred compensation plan balances on the Consolidated Balance Sheets (in thousands): 

	December 31,
	2023		2022
Deferred compensation plan asset components:
Cash surrender value of corporate-owned life insurance policies	$	23,545	$	19,089
Fair value of mutual funds and money market funds		54,836		43,933
Total	$	78,381	$	63,022
Deferred compensation plan assets reported in:
Other long-term assets	$	78,381	$	63,022
Deferred compensation plan liabilities reported in:
Accrued compensation and related benefits (short-term)	$	384	$	118
Other long-term liabilities		80,903		64,863
Total	$	81,287	$	64,981

Revenue Recognition

The Company recognizes revenue when it transfers control of promised goods or services to its customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. See Note 2 for further discussion.

R&D

Costs incurred in R&D are expensed as incurred.

Warranty Reserve

The Company generally provides either a one- or two-year warranty against defects in materials and workmanship and will repair the products, provide replacements at no charge to customers or issue a refund. As they are considered assurance-type warranties, the Company does not account for them as separate performance obligations. Warranty reserve requirements are generally based on a specific assessment of the products sold with warranties when a customer asserts a claim for warranty or a product defect. 

Leases

The Company determines if an arrangement is a lease at inception. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Operating lease right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term, and operating lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of remaining lease payments over the lease term. ROU assets also include any initial direct costs incurred and prepaid lease payments, less lease incentives received. Because the implicit rate in each lease is not readily determinable, the Company uses its estimated incremental borrowing rate to determine the present value of the remaining lease payment. The Company recognizes operating lease costs on a straight-line basis over the lease term.

The Company does not record short-term leases with a term of 12 months or less at the commencement date on the Consolidated Balance Sheets. For lease arrangements that contain lease and non-lease components, the Company accounts for them as single lease components.

For lease arrangements where the Company is the lessor, the Company recognizes lease income from operating leases on a straight-line basis over the lease term.

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Stock-Based Compensation

The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The fair value of RSUs with only service conditions is determined based on the grant date stock price. The fair value of all other awards is determined based on the following valuation methods:

Type of Awards	Valuation Method
RSUs with performance conditions (“PSUs”) that have a purchase price adjustment	Monte Carlo simulation model
RSUs with market conditions (“MSUs”)	Monte Carlo simulation model
RSUs with both performance and market conditions (“MPSUs”)	Monte Carlo simulation model
Shares issued under the employee stock purchase plan (“ESPP”)	Black-Scholes model

The valuation models consider inputs including stock price, expected volatility, expected term of awards, risk-free interest rate, and expected dividend yield. Expected volatility used in the models is determined based on historical volatility of the Company’s stock price for the period, which corresponds to the expected term of the awards, immediately preceding the granting of the awards.

Compensation expense related to awards with service conditions is recorded on a straight-line basis over the requisite service period. Compensation expense related to awards subject to performance or market conditions is recognized over the requisite service period for each separately vesting tranche. For awards with only market conditions, compensation expense is not reversed if the market conditions are not satisfied. For awards with only performance conditions, as well as awards containing both market and performance conditions, the Company recognizes compensation expense when it becomes probable that the performance goals will be achieved. Management performs the probability assessment on a quarterly basis by reviewing external factors, such as macroeconomic conditions and the analog industry revenue forecasts, and internal factors, such as the Company’s business and operational objectives and revenue forecasts. Changes in the probability assessment of achievement of the performance conditions are accounted for in the period of change by recording a cumulative catch-up adjustment as if the new estimate had been applied since the service inception date. Any previously recognized compensation expense is reversed if the performance conditions are not expected to be satisfied as a result of management’s assessment.

The Company accounts for forfeitures of equity awards when they occur.

Accounting for Income Taxes 

The Company recognizes federal, state and foreign current tax liabilities or assets based on its estimate of taxes payable or refundable in the current fiscal year by tax jurisdiction. The Company also recognizes federal, state and foreign deferred tax assets or liabilities for its estimate of future tax effects attributable to temporary differences and carryforwards. The Company records a valuation allowance to reduce any deferred tax assets by the amount of any tax benefits that, based on available evidence and judgment, are not expected to be realized.

The Company’s calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments and involves dealing with uncertainties in the application of complex tax laws. The Company’s estimates of current and deferred tax assets and liabilities may change based on, in part, added certainty, finality or uncertainty to an anticipated outcome, changes in accounting or tax laws in the U.S. or foreign jurisdictions where the Company operates, or changes in other facts or circumstances. In addition, the Company recognizes liabilities for potential U.S. and foreign income tax for uncertain income tax positions taken on its tax returns if it has less than a 50% likelihood of being sustained. If the Company determines that payment of these amounts is unnecessary or if the recorded tax liability is less than its current assessment, the Company may be required to recognize an income tax benefit or additional income tax expense in its financial statements in the period such determination is made. The Company has calculated its uncertain tax positions which were attributable to certain estimates and judgments.

Litigation and Contingencies

The Company is a party to actions and proceedings in the ordinary course of business, including challenges to the enforceability or validity of its intellectual property, claims that the Company’s products infringe on the intellectual property rights of others, and employment matters. The Company may also be subject to litigation initiated by its stockholders. The pending proceedings involve complex questions of fact and law and will require the expenditure of significant funds and the diversion of other resources to prosecute and defend. In addition, from time to time, the Company becomes aware that it is subject to other contingent liabilities. When this occurs, the Company will evaluate the appropriate accounting for the potential contingent liabilities to determine whether a contingent liability should be recorded. In making this determination, management may, depending on the nature of the matter, consult with internal and external legal counsel and technical experts. Based on the facts and circumstances in each matter, the Company uses its judgment to determine whether it is probable that a contingent loss has occurred and whether the amount of such loss can be estimated. If the Company determines a loss is probable and estimable, the Company records a contingent loss. In determining the amount of a contingent loss, the Company takes into account advice received from experts for each specific matter regarding the status of legal proceedings, settlement negotiations, prior case history and other factors. Should the judgments and estimates made by management need to be adjusted as additional information becomes available, the Company may need to record additional contingent losses. Alternatively, if the judgments and estimates made by management are adjusted, for example, if a particular contingent loss does not occur, the contingent loss recorded would be reversed.

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Net Income per Share

Basic net income per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into shares of common stock, and calculated using the treasury stock method. Contingently issuable shares, including equity awards with performance conditions or market conditions, are considered outstanding shares of common stock and included in the basic net income per share as of the date that all necessary conditions to earn the awards have been satisfied. Prior to the end of the contingency period, the number of contingently issuable shares included in the diluted net income per share is based on the number of shares, if any, that would be issuable under the terms of the arrangement at the end of the reporting period.

The Company’s RSUs contain forfeitable rights to receive cash dividend equivalents, which are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do not fulfill the requisite service requirement and, as a result, the awards do not vest. Accordingly, these awards are not treated as participating securities in the net income per share calculation. 

Comprehensive Income 

Comprehensive income represents the change in the Company’s net assets during the period from non-owner sources. Accumulated other comprehensive loss presented on the Consolidated Balance Sheets primarily consists of unrealized gains or losses related to available-for-sale investments and foreign currency translation adjustments.

Recently Adopted Accounting Pronouncement

In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. The guidance requires an acquirer to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Accounting Standards Codification 606, Revenue from Contracts with Customers, as if it had originated the contracts. The Company adopted this guidance at the beginning of fiscal year 2023 prospectively and it did not impact the consolidated financial statements for the year ended December 31, 2023. The Company is evaluating the impact of this guidance on its recent acquisition but does not expect a material impact on its consolidated financial statements. See Note 17 for additional information regarding this acquisition.

New Accounting Pronouncements Not Yet Adopted as of December 31, 2023

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which aims to improve disclosures regarding a public entity’s reportable segments, primarily through more comprehensive disclosures around significant segment expenses. The guidance will be effective for the annual reporting for fiscal year 2024 and interim reporting for the first quarter in 2025, and should be applied retroactively to all prior periods presented. The Company is evaluating the impact of adoption on its consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which aims to improve an entity’s income tax disclosures around its effective rate reconciliation, income taxes paid, disaggregation of income before income taxes and income tax expense. The guidance will be effective for annual reporting for fiscal year 2025. The standard should be applied prospectively and retrospective application is permitted. The Company does not expect the adoption of this standard to have a material impact on its consolidated financial statements.

2.  REVENUE RECOGNITION

Revenue from Product Sales

The Company generates revenue primarily from product sales, which include assembled and tested ICs, as well as dies in wafer form. These product sales accounted for 99%, 98% and 97% of the Company’s total revenue for the years ended December 31, 2023, 2022 and 2021, respectively. The remaining revenue primarily includes royalty revenue from licensing arrangements and revenue from wafer testing services performed for third parties, which have not been significant for the periods presented. See Note 15 for the disaggregation of the Company’s revenue by geographic region and by product family.

The Company sells its products primarily through third-party distributors, value-added resellers, OEMs, ODMs and EMS providers. For the years ended December 31, 2023, 2022 and 2021, 80%, 83% and 88%, respectively, of the Company’s product sales were made through distribution arrangements. These distribution arrangements contain enforceable rights and obligations specific to those distributors and not the end customers. Purchase orders, which are generally governed by sales agreements or the Company’s standard terms of sale, set the final terms for unit price, quantity, shipping and payment agreed between the Company and the customer. The Company considers purchase orders to be the contracts with customers. The unit price as stated on the purchase orders is considered the observable, stand-alone selling price for the arrangements.

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The Company recognizes revenue when it satisfies a performance obligation by transferring control of the promised goods or services to its customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The Company excludes taxes assessed by government authorities, such as sales taxes, from revenue.

Product sales consist of a single performance obligation that the Company satisfies at a point in time. The Company recognizes product revenue from distributors and direct end customers when the following events have occurred: (a) the Company has transferred physical possession of the products, (b) the Company has a present right to payment, (c) the customer has legal title to the products, and (d) the customer bears significant risks and rewards of ownership of the products. In accordance with the shipping terms specified in the contracts, these criteria are generally met when the products are shipped from the Company’s facilities (such as the “Ex Works” shipping term) or delivered to the customers’ locations (such as the “Delivered Duty Paid” shipping term).

Under certain consignment agreements, revenue is not recognized when the products are shipped and delivered to be held at customers’ designated locations because the Company continues to control the products and retain ownership, and the customers do not have an unconditional obligation to pay. The Company recognizes revenue when the customers consume the products from the consigned inventory locations or at which time control transfers to the customers and the Company invoices them for payment.

Variable Consideration

The Company accounts for price adjustments and stock rotation rights as variable consideration that reduces the transaction price and recognizes that reduction in the same period the associated revenue is recognized. Certain U.S.-based distributors have price adjustment rights when they sell the Company’s products to their end customers at a price that is lower than the distribution price invoiced by the Company. When the Company receives claims from the distributors that products have been sold to the end customers at the lower prices, the Company issues the distributors credit memos for the price adjustments. The Company estimates the price adjustments using the expected value method based on an analysis of historical claims, at both the distributor and product level, as well as an assessment of any known trends of product sales mix. Other U.S. distributors and non-U.S. distributors do not have price adjustment rights. The Company records a credit against accounts receivable for the estimated price adjustments, with a corresponding reduction to revenue.

Certain distributors have limited stock rotation rights that permit the return of a small percentage of the previous six months’ purchases in accordance with the contract terms. The Company estimates the stock rotation returns using the expected value method based on an analysis of historical returns, and the current level of inventory in the distribution channel. The Company records a liability for the stock rotation reserve, with a corresponding reduction to revenue. In addition, the Company recognizes an asset for product returns which represents the right to recover products from the customers related to stock rotations, with a corresponding reduction to cost of revenue.

Contract Balances

Accounts Receivable:

The Company records a receivable when it has an unconditional right to receive consideration after the performance obligations are satisfied. As of  December 31, 2023 and 2022, accounts receivable totaled $179.9 million and $182.7 million, respectively. The Company’s accounts receivable are short-term, with standard payment terms generally ranging from 30 to 90 days. The Company did not recognize any write-offs of accounts receivable or record any allowance for credit losses for the periods presented. 

Contract Liabilities:

For certain customers located in Asia, the Company requires cash payments two weeks before the products are scheduled to be shipped to the customers. The Company records these payments received in advance of performance as customer prepayments within current accrued liabilities. As of December 31, 2023 and 2022, customer prepayments totaled $2.8 million and $3.6 million, respectively. The decrease in the customer prepayment balance for the year ended December 31, 2023 resulted from a decrease in unfulfilled customer orders for which the Company had received payments. For the year ended December 31, 2023, the Company recognized substantially all of the revenue that was included in the customer prepayment balance as of December 31, 2022.

Practical Expedients

The Company has elected the practical expedient to expense sales commissions as incurred because the amortization period would have been one year or less. 

The Company’s standard payment terms generally require customers to pay 30 to 90 days after the Company satisfies the performance obligations. For those customers who are required to pay in advance, the Company satisfies the performance obligations generally within a quarter. For these reasons, the Company has elected not to determine whether contracts with customers contain significant financing components.

The Company’s unsatisfied performance obligations primarily include products held in consignment arrangements and customer purchase orders for products that the Company has not yet shipped. Because the Company expects to fulfill these performance obligations within one year, the Company has elected not to disclose the amount of these remaining performance obligations.

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3.  CASH, CASH EQUIVALENTS, INVESTMENTS AND RESTRICTED CASH

The following is a summary of the Company’s cash, cash equivalents and debt investments (in thousands): 

	December 31,
	2023		2022
Cash	$	392,329	$	273,145
Money market funds		135,514		15,462
Certificates of deposit		127,123		130,467
Corporate debt securities		95,101		292,586
Commercial paper		-		17,928
U.S. treasuries and government agency bonds		358,409		8,285
Auction-rate securities backed by student-loan notes		567		1,711
Total	$	1,109,043	$	739,584

	December 31,
	2023		2022
Reported as:
Cash and cash equivalents	$	527,843	$	288,607
Short-term investments		580,633		449,266
Investment within other long-term assets		567		1,711
Total	$	1,109,043	$	739,584

The following table summarizes the contractual maturities of the short-term and long-term available-for-sale investments as of December 31, 2023 (in thousands): 

	Amortized Cost		Fair Value
Due in less than 1 year	$	398,670	$	397,884
Due in 1 - 5 years		183,266		182,749
Due in greater than 5 years		574		567
Total	$	582,510	$	581,200

Gross realized gains and losses were not material for the periods presented.

The following tables summarize the unrealized gain and loss positions related to the available-for sale investments (in thousands): 

	December 31, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Money market funds	$	135,514	$	-	$	-		$	135,514
Certificates of deposit		127,123		-		-			127,123
Corporate debt securities		96,636		4		(1,539	)		95,101
U.S. treasuries and government agency bonds		358,177		327		(95	)		358,409
Auction-rate securities backed by student-loan notes		574		-		(7	)		567
Total	$	718,024	$	331	$	(1,641	)	$	716,714

	December 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Money market funds	$	15,462	$	-	$	-		$	15,462
Certificates of deposit		130,467		-		-			130,467
Corporate debt securities		300,529		18		(7,961	)		292,586
Commercial paper		17,928		-		-			17,928
U.S. treasuries and government agency bonds		8,487		-		(202	)		8,285
Auction-rate securities backed by student-loan notes		1,770		-		(59	)		1,711
Total	$	474,643	$	18	$	(8,222	)	$	466,439

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The following tables present information about the available-for-sale investments that had been in a continuous unrealized loss position for less than 12 months and for greater than 12 months (in thousands):

	December 31, 2023
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	20,792	$	(19	)	$	70,806	$	(1,520	)	$	91,598	$	(1,539	)
U.S. treasuries and government agency bonds		97,599		(95	)		-		-			97,599		(95	)
Auction-rate securities backed by student-loan notes		-		-			567		(7	)		567		(7	)
Total	$	118,391	$	(114	)	$	71,373	$	(1,527	)	$	189,764	$	(1,641	)

	December 31, 2022
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	72,943	$	(973	)	$	202,074	$	(6,988	)	$	275,017	$	(7,961	)
U.S. treasuries and government agency bonds		987		(2	)		7,298		(200	)		8,285		(202	)
Auction-rate securities backed by student-loan notes		-		-			1,711		(59	)		1,711		(59	)
Total	$	73,930	$	(975	)	$	211,083	$	(7,247	)	$	285,013	$	(8,222	)

An impairment exists when the fair value of an investment is less than its amortized cost basis. As of December 31, 2023 and 2022, the Company did not consider the impairment of its investments to be a result of credit losses. The Company typically invests in highly rated securities, with the primary objective of minimizing the potential risk of principal loss. The Company’s investment policy generally requires securities to be investment grade and limits the amount of credit exposure to any one issuer. When evaluating a debt security for impairment, management reviews factors such as the Company’s intent to sell, or whether it will more likely than not be required to sell, the security before recovery of its amortized cost basis, the extent to which the fair value of the security is less than its cost, the financial condition of the issuer and the credit quality of the investment.

Non-Marketable Equity Investment

In November 2020, the Company made an equity investment in a privately held Swiss company (the “Investee”) that is accounted for under the measurement alternative. In April 2022, the Company made an additional investment in the form of a convertible loan. One member of the Board of Directors was an executive officer of a company that has a commercial relationship with the Investee. In addition, the Company’s Chief Executive Officer had a personal investment in the Investee and was on the Investee’s Board of Directors. As of December 31, 2022, the Company’s investment in the Investee, which is denominated in Swiss Franc, had a carrying value of $5.4 million.

In May 2023, the Company sold all its investments in the Investee for $7.4 million and recorded a gain of $1.4 million, which was included as a component of other income (expense), net, in the Consolidated Statements of Operations for the year ended December 31, 2023.

Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported on the Consolidated Balance Sheets to the amounts reported on the Consolidated Statements of Cash Flows (in thousands):   

	December 31,
	2023		2022
Cash and cash equivalents	$	527,843	$	288,607
Restricted cash included in other current assets		33,204		-
Restricted cash included in other long-term assets		134		122
Total cash, cash equivalents and restricted cash reported on the Consolidated Statements of Cash Flows	$	561,181	$	288,729

As of December 31, 2023, restricted cash included in other current assets was related to preliminary purchase consideration held in a trust account in connection with the Company’s recent acquisition. See Note 17 for additional information. As of December 31, 2023 and 2022, restricted cash included in other long-term assets was related to a security deposit that is set aside in a bank account and cannot be withdrawn by the Company under the terms of a lease agreement. The restriction will end upon the expiration of the lease.

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4. FAIR VALUE MEASUREMENTS

Fair Value Hierarchy

The Company has estimated the fair value of its financial assets by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

● Level 1 —includes instruments with quoted prices in active markets for identical assets.

● Level 2 —includes instruments for which the valuations are based upon quoted market prices in active markets involving similar assets or inputs other than quoted prices that are observable for the assets. The market inputs used to value these instruments generally consist of market yields, recently executed transactions, broker/dealer quotes or alternative pricing sources with reasonable levels of price transparency. Pricing sources may include industry standard data providers, security master files from large financial institutions, and other third-party sources used to determine a daily market value.

● Level 3 —includes instruments for which the valuations are based on inputs that are unobservable and significant to the overall fair value measurement.

Financial Assets Measured at Fair Value on a Recurring Basis

The following table details the fair value of the financial assets measured on a recurring basis (in thousands):

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Money market funds	$	135,514	$	135,514	$	-	$	-
Certificates of deposit		127,123		-		127,123		-
Corporate debt securities		95,101		-		95,101		-
U.S. treasuries and government agency bonds		358,409		-		358,409		-
Auction-rate securities backed by student-loan notes		567		-		-		567
Mutual funds and money market funds under deferred compensation plan		54,836		54,836		-		-
Total	$	771,550	$	190,350	$	580,633	$	567

	December 31, 2022
	Total		Level 1		Level 2		Level 3
Money market funds	$	15,462	$	15,462	$	-	$	-
Certificates of deposit		130,467		-		130,467		-
Corporate debt securities		292,586		-		292,586		-
Commercial paper		17,928		-		17,928		-
U.S. treasuries and government agency bonds		8,285		-		8,285		-
Auction-rate securities backed by student-loan notes		1,711		-		-		1,711
Mutual funds and money market funds under deferred compensation plan		43,933		43,933		-		-
Total	$	510,372	$	59,395	$	449,266	$	1,711

Redemptions and changes in the fair value of the auction-rate securities classified as Level 3 assets were not material for the periods presented.

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5. BALANCE SHEET COMPONENTS

Inventories 

Inventories consist of the following (in thousands):

	December 31,
	2023		2022
Raw materials	$	118,917	$	126,760
Work in process		112,750		134,071
Finished goods		152,035		186,459
Total	$	383,702	$	447,290

Other Current Assets

Other current assets consist of the following (in thousands):

	December 31,
	2023		2022
Other receivables	$	50,000	$	-
RSU tax withholding proceeds receivable		20,141		14,480
Prepaid expenses		28,964		11,045
Restricted cash		33,204		-
Other		15,154		17,217
Total	$	147,463	$	42,742

Other receivables relate to a deposit made to a supplier under a long-term wafer supply agreement. See Note 12 for further details. 

Property and Equipment, Net

Property and equipment, net, consist of the following (in thousands):

	December 31,
	2023			2022
Land	$	48,490		$	41,924
Production equipment and software		270,390			254,882
Buildings and improvements		205,132			195,205
Transportation equipment		28,641			28,612
Leasehold improvements		17,052			17,389
Furniture and fixtures		11,711			11,378
Construction in progress		16,980			1,908
Property and equipment, gross		598,396			551,298
Less: accumulated depreciation and amortization		(229,444	)		(194,141	)
Total	$	368,952		$	357,157

Depreciation and amortization expense on property and equipment was $40.0 million, $36.8 million and $28.4 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Other Long-Term Assets

Other long-term assets consist of the following (in thousands):

	December 31,
	2023		2022
Deferred compensation plan assets	$	78,381	$	63,022
Prepaid wafer purchases		120,000		170,000
Other		12,896		16,264
Total	$	211,277	$	249,286

Prepaid wafer purchases relate to a deposit made to a supplier under a long-term wafer supply agreement. See Note 12 for further details.

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Other Accrued Liabilities

Other accrued liabilities consist of the following (in thousands):

	December 31,
	2023		2022
Dividends and dividend equivalents	$	57,697	$	42,170
Warranty		16,906		24,082
Stock rotation and sales returns		18,843		14,931
Income tax payable		8,063		15,595
Other		14,282		16,901
Total	$	115,791	$	113,679

Other Long-Term Liabilities

Other long-term liabilities consist of the following (in thousands):

	December 31,
	2023		2022
Deferred compensation plan liabilities	$	80,903	$	64,863
Dividend equivalents		2,187		6,847
Operating lease liabilities		5,565		1,664
Total	$	88,655	$	73,374

6. LEASES

Lessee

The Company has operating leases primarily for administrative, sales and marketing offices, manufacturing operations and R&D facilities, employee housing units and certain equipment. These leases have remaining lease terms from less than one year to seven years. Some of these leases include options to renew the lease term for up to five years or on a month-to-month basis. The Company does not have finance lease arrangements.

The following table summarizes the balances of operating lease ROU assets and liabilities (in thousands):

		December 31,
	Financial Statement Line Item	2023		2022
Operating lease ROU assets	Other long-term assets	$	8,355	$	4,288
Operating lease liabilities	Other accrued liabilities	$	2,303	$	2,133
	Other long-term liabilities	$	5,565	$	1,664

The following tables summarize certain information related to the leases (in thousands, except percentages and years):

	Year Ended December 31,
	2023		2022		2021
Lease costs:
Operating lease costs	$	3,113	$	2,704	$	2,454
Other		2,120		1,769		740
Total lease costs	$	5,233	$	4,473	$	3,194

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	Year Ended December 31,
	2023		2022		2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	2,954	$	2,762	$	2,315
ROU assets obtained in exchange for new operating lease liabilities	$	7,081	$	1,175	$	5,195

	December 31,
	2023			2022
Weighted-average remaining lease term (in years)		4.7			2.1
Weighted-average discount rate		4.3	%		2.1	%

As of  December 31, 2023, the maturities of the lease liabilities were as follows (in thousands):

2024	$	2,583
2025		1,909
2026		1,230
2027		1,238
Thereafter		1,653
Total remaining lease payments		8,613
Less: imputed interest		(745	)
Total lease liabilities	$	7,868

As of  December 31, 2023, the operating lease that has not yet commenced is not material.

Lessor

The Company owns certain office buildings and leases a portion of these properties to third parties under arrangements that are classified as operating leases. These leases have remaining lease terms ranging from less than one year to three years. Some of these leases include options to renew the lease term for up to five years.

Income related to lease payments was $1.5 million, $2.4 million and $2.2 million for the years ended December 31, 2023, 2022 and 2021, respectively. As of December 31, 2023, future income related to lease payments was as follows (in thousands):

2024	$	760
2025		235
2026		41
Total	$	1,036

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7. STOCK-BASED COMPENSATION

2014 Equity Incentive Plan 

In  April 2013, the Board of Directors adopted the 2014 Equity Incentive Plan (the “2014 Plan”), which the Company’s stockholders approved in  June 2013. In  October 2014, the Board of Directors approved certain amendments to the 2014 Plan. The amended 2014 Plan became effective on  November 13, 2014 and provided for the issuance of up to 5.5 million shares. In  April 2020, the Board of Directors further amended and restated the amended 2014 Plan (the “Amended and Restated 2014 Plan”), which the Company’s stockholders approved in  June 2020. The Amended and Restated 2014 Plan became effective on  June 11, 2020 and provides for the issuance of up to 10.5 million shares. The Amended and Restated 2014 Plan will expire on  June 11, 2030. As of  December 31, 2023, 4.2 million shares remained available for future issuance under the Amended and Restated 2014 Plan.  

Stock-Based Compensation Expense

The Company recognized stock-based compensation expense as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Cost of revenue	$	4,545	$	4,721	$	3,543
Research and development		36,611		35,355		26,030
Selling, general and administrative		108,555		120,916		93,906
Total stock-based compensation expense	$	149,711	$	160,992	$	123,479
Tax benefit related to stock-based compensation (1)	$	2,519	$	2,498	$	1,760

(1) Amount reflects the tax benefit related to stock-based compensation recorded for equity awards that are expected to generate tax deductions when they vest in future periods. Equity awards granted to the Company’s executive officers are subject to the tax deduction limitations set by Section 162(m) of the IRC.

RSUs

The Company’s RSUs include time-based RSUs, PSUs, MSUs, and MPSUs. Vesting of awards with performance conditions or market conditions is subject to the achievement of pre-determined performance or market goals and the approval of such achievement by the Compensation Committee of the Board of Directors (the “Compensation Committee”). All awards include service conditions which require continued employment with the Company.

A summary of RSU activity is presented in the table below (in thousands, except per share amounts):

	Time-Based RSUs					PSUs and MPSUs						MSUs					Total
	Number of Shares			Weighted-Average Grant Date Fair Value Per Share		Number of Shares				Weighted-Average Grant Date Fair Value Per Share		Number of Shares			Weighted-Average Grant Date Fair Value Per Share		Number of Shares			Weighted-Average Grant Date Fair Value Per Share
Outstanding at January 1, 2021		161		$	151.62		1,390			$	132.60		1,554		$	40.40		3,105		$	87.42
Granted		46		$	384.33		365		(1)	$	354.12		-		$	-		411		$	357.49
Vested		(71	)	$	144.46		(577	)		$	91.50		(324	)	$	23.57		(972	)	$	72.69
Forfeited		(11	)	$	207.04		(12	)		$	103.84		(12	)	$	68.48		(35	)	$	124.50
Outstanding at December 31, 2021		125		$	235.82		1,166			$	222.78		1,218		$	44.59		2,509		$	136.87
Granted		49		$	390.89		35		(1)(2)	$	385.80		917		$	199.63		1,001		$	215.63
Vested		(61	)	$	193.18		(452	)		$	147.78		(324	)	$	23.57		(837	)	$	103.02
Forfeited		(7	)	$	316.00		(1	)		$	377.86		(6	)	$	216.37		(14	)	$	275.47
Outstanding at December 31, 2022		106		$	327.13		748			$	275.70		1,805		$	126.57		2,659		$	176.50
Granted		51		$	472.38		281		(1)	$	449.38		31		$	330.95		363		$	444.86
Vested		(49	)	$	296.65		(543	)		$	257.24		(319	)	$	23.57		(911	)	$	177.54
Forfeited		(6	)	$	387.61		(4	)		$	315.19		(15	)	$	110.65		(25	)	$	209.23
Outstanding at December 31, 2023		102		$	411.11		482			$	397.77		1,502		$	152.89		2,086		$	222.04

(1) Amount reflects the number of awards that  may ultimately be earned based on management’s probability assessment of the achievement of performance conditions at each reporting period.

(2) Amount included grants and cancellations of the 2022 Executive PSUs as defined under the “2022 PSUs” section.

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The intrinsic value related to vested RSUs was $461.3 million, $336.8 million and $381.2 million for the years ended December 31, 2023, 2022 and 2021, respectively. As of December 31, 2023, the total intrinsic value of all outstanding RSUs was $1.3 billion, based on the closing stock price of $630.78. As of December 31, 2023, unamortized compensation expense related to all outstanding RSUs was $232.6 million with a weighted-average remaining recognition period of approximately two years. 

Cash proceeds from vested PSUs with a purchase price totaled $1.1 million, $5.4 million and $17.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Time-Based RSUs

For the years ended December 31, 2023, 2022 and 2021, the Compensation Committee granted 51,000, 49,000 and 46,000 RSUs, respectively, with service conditions to non-executive employees and non-employee directors. The RSUs generally vest over four years for employees and one year for directors, subject to continued service with the Company.

PSUs and MPSUs

2023 PSUs:

In February 2023, the Compensation Committee granted 69,000 PSUs to the executive officers, which represent a target number of shares that can be earned based on the degree of achievement of two sets of performance goals (“2023 Executive PSUs”). For the first goal, the executive officers can earn up to 300% of the target number of the 2023 Executive PSUs based on the achievement of the Company’s average three-year (2023 through 2025) revenue growth rate in excess of the analog industry’s average three-year revenue growth rate as published by the Semiconductor Industry Association (the “SIA”). For the second goal, the executive officers can earn up to an additional 200% of the target number of the 2023 Executive PSUs if the Company secures additional manufacturing capacity outside China during a three-year performance period. For both goals, a percentage of the 2023 Executive PSUs will fully vest on December 31, 2025, depending on the degree to which the pre-determined goals are met during the performance periods. Assuming the achievement of the highest level of the performance goals, the total stock-based compensation cost for the 2023 Executive PSUs is $156.2 million.

In February 2023, the Compensation Committee granted 13,000 PSUs to certain non-executive employees, which represent a target number of shares that can be earned based on the degree of achievement of the Company’s 2024 revenue goals for certain regions or product line divisions, or based on the degree of achievement of the Company’s average two-year (2023 and 2024) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2023 Non-Executive PSUs”). The maximum number of shares that an employee can earn is either 200% or 300% of the target number of the 2023 Non-Executive PSUs, depending on the job classification of the employee. 50% of the 2023 Non-Executive PSUs will vest in the first quarter of 2025 depending on the degree to which the pre-determined goals are met during the performance period. The remaining 2023 Non-Executive PSUs will vest over the following two years on a quarterly basis. Assuming the achievement of the highest level of performance goals, the total stock-based compensation cost for the 2023 Non-Executive PSUs is $13.8 million.

The 2023 Executive PSUs and the 2023 Non-Executive PSUs contain a purchase price feature, which requires the employees to pay the Company $30 per share upon vesting of the shares. The $30 purchase price requirement is deemed satisfied and waived if the Company’s stock price on the last trading day of the performance period is $30 higher than the grant date stock price of $467.62. The Company determined the grant date fair value of the 2023 Executive PSUs and the 2023 Non-Executive PSUs using a Monte Carlo simulation model with the following assumptions: stock price of $467.62, simulation term of four years, expected volatility of 51.0%, risk-free interest rate of 3.9%, and expected dividend yield of 0.9%. There is no illiquidity discount because the awards do not contain any post-vesting sales restrictions.

2022 PSUs:

In February 2022, the Compensation Committee granted 81,000 PSUs to the executive officers, which represented a target number of shares that could be earned subject to the achievement of two sets of performance goals (“2022 Executive PSUs”). For the first goal, the executive officers could earn up to 300% of the target number of the 2022 Executive PSUs based on the achievement of the Company’s average two-year (2022 and 2023) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA. 50% of the 2022 Executive PSUs would vest in the first quarter of 2024 if the pre-determined revenue goal was met during the performance period. The remaining 2022 Executive PSUs would vest over the following two years on a quarterly basis. For the second goal, the executive officers could earn up to an additional 200% of the target number of the 2022 Executive PSUs if the Company secured additional wafer capacity during a three-year performance period. The 2022 Executive PSUs related to the second goal would fully vest in the first quarter of 2025 if the pre-determined goal was met during the performance period. In addition, all vested shares related to the second goal would be subject to a post-vesting sales restriction period of one year. Assuming the achievement of the highest level of the performance goals, the total stock-based compensation cost for the 2022 Executive PSUs would be $142.7 million. The 2022 Executive PSUs were subsequently cancelled by the Board of Directors in October 2022. See the “2022 MSUs” section for further details.

In February 2022, the Compensation Committee granted 14,000 PSUs to certain non-executive employees, which represented a target number of shares that could be earned subject to the achievement of the Company’s 2023 revenue goals for certain regions or product line divisions, or based on the achievement of the Company’s average two-year (2022 and 2023) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2022 Non-Executive PSUs”). The maximum number of shares that an employee could earn was either 200% or 300% of the target number of the 2022 Non-Executive PSUs, depending on the job classification of the employee. Based on the actual revenue achievement at the end of the performance period, a total of 29,000 shares were awarded to the non-executive employees. 50% of the 2022 Non-Executive PSUs will vest in the first quarter of 2024. The remaining 2022 Non-Executive PSUs will vest over the following two years on an annual or quarterly basis. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2022 Non-Executive PSUs is $11.1 million.

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The 2022 Executive PSUs and the 2022 Non-Executive PSUs contained a purchase price feature, which required the employees to pay the Company $30 per share upon vesting of the shares. The $30 purchase price requirement was deemed satisfied and waived if the average stock price for 20 consecutive trading days at any time during 2022 and 2023 was $30 higher than the grant date stock price of $393.16. This market condition was achieved in the first quarter of 2022. The Company determined the grant date fair value of the 2022 Executive PSUs for the first goal and the 2022 Non-Executive PSUs using a Monte Carlo simulation model with the following assumptions: stock price of $393.16, simulation term of four years, expected volatility of 44.6%, risk-free interest rate of 1.5%, and expected dividend yield of 0.8%. In addition, for the 2022 Executive PSUs related to the second goal, the fair value was determined based on the closing stock price at the end of each reporting period, adjusted for accrued dividends and an illiquidity discount of 10.3% to account for the post-vesting sales restrictions.

2021 PSUs:

In February 2021, the Compensation Committee granted 80,000 PSUs to the executive officers, which represented a target number of shares that could be earned subject to the achievement of two sets of performance goals (“2021 Executive PSUs”). For the first goal, the executive officers could earn up to 300% of the target number of the 2021 Executive PSUs based on the achievement of the Company’s average two-year (2021 and 2022) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA. Based on the actual revenue achievement at the end of the performance period, a total of 240,000 shares were awarded to the executive officers. 50% of the 2021 Executive PSUs vested in the first quarter of 2023. The remaining 2021 Executive PSUs vest over the following two years on a quarterly basis. For the second goal, the executive officers could earn an additional 100% of the target number of the 2021 Executive PSUs subject to the achievement of three environmental objectives under the Company’s ESG initiatives with a performance period through December 31, 2023. As of December 31, 2023, all three environmental objectives were achieved and a total of 80,000 shares were awarded to the executive officers. The 2021 Executive PSUs related to the ESG goal fully vested upon achievement of the objectives. All vested shares related to the ESG goal are subject to a post-vesting sales restriction period of one year. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2021 Executive PSUs is $114.4 million. 

In February 2021, the Compensation Committee granted 14,000 PSUs to certain non-executive employees, which represented a target number of shares that could be earned subject to the achievement of the Company’s 2022 revenue goals for certain regions or product line divisions, or based on the achievement of the Company’s average two-year (2021 and 2022) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2021 Non-Executive PSUs”). The maximum number of shares that an employee could earn was either 200% or 300% of the target number of the 2021 Non-Executive PSUs, depending on the job classification of the employee. Based on the actual revenue achievement at the end of the performance period, a total of 33,000 shares were awarded to the non-executive employees. 50% of the 2021 Non-Executive PSUs vested in the first quarter of 2023. The remaining 2021 Non-Executive PSUs vest over the following two years on an annual or quarterly basis. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2021 Non-Executive PSUs is $11.9 million.

The 2021 Executive PSUs and the 2021 Non-Executive PSUs contained a purchase price feature, which required the employees to pay the Company $30 per share upon vesting of the shares. The $30 purchase price requirement was deemed satisfied and waived if the average stock price for 20 consecutive trading days at any time between the grant date and December 31, 2022 was $30 higher than the grant date stock price of $374.57. This market condition was achieved in the third quarter of 2021. The Company determined the grant date fair value of the 2021 Executive PSUs and the 2021 Non-Executive PSUs using a Monte Carlo simulation model with the following assumptions: stock price of $374.57, simulation term of 4.0 years, expected volatility of 41.4%, risk-free interest rate of 0.3%, and expected dividend yield of 0.6%. In addition, the grant date fair value for the 2021 Executive PSUs subject to the ESG goal included an illiquidity discount of 9.8% to account for the post-vesting sales restrictions.

2020 PSUs:

In  February 2020, the Compensation Committee granted 100,000 PSUs to the executive officers, which represented a target number of shares that could be earned based on the Company’s average two-year (2020 and 2021) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2020 Executive PSUs”). The maximum number of shares that an executive officer could earn was 300% of the target number of the 2020 Executive PSUs. Based on the actual revenue achievement at the end of the performance period, a total of 300,000 shares were awarded to the executive officers. 50% of the 2020 Executive PSUs vested in the first quarter of 2022. The remaining 2020 Executive PSUs vest over the following two years on a quarterly basis. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2020 Executive PSUs is $51.1 million.

In  February 2020, the Compensation Committee granted 30,000 PSUs to certain non-executive employees, which represented a target number of shares that could be earned based on the Company’s 2021 revenue goals for certain regions or product line divisions, or based on the Company’s average two-year (2020 and 2021) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2020 Non-Executive PSUs”). The maximum number of shares that an employee could earn was either 200% or 300% of the target number of the 2020 Non-Executive PSUs, depending on the job classification of the employee. Based on the actual revenue achievement at the end of the performance period, a total of 71,000 shares were awarded to the non-executive employees. 50% of the 2020 Non-Executive PSUs vested in the first quarter of 2022. The remaining 2020 Non-Executive PSUs vest over the following two years on an annual or quarterly basis. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2020 Non-Executive PSUs is $11.8 million.

The 2020 Executive PSUs and the 2020 Non-Executive PSUs contained a purchase price feature, which required the employees to pay the Company $30 per share upon vesting of the shares. The $30 purchase price requirement was deemed satisfied and waived if the average stock price for 20 consecutive trading days at any time during the performance period was $30 higher than the grant date stock price of $182.62. This market condition was achieved in the second quarter of 2020. The Company determined the grant date fair value of the 2020 Executive PSUs and the 2020 Non-Executive PSUs using a Monte Carlo simulation model with the following assumptions: stock price of $182.62, simulation term of 2.0 years, expected volatility of 33.6%, risk-free interest rate of 1.4%, and expected dividend yield of 1.1%. 

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2020 MPSUs:

In  July 2020, the Compensation Committee granted 43,000 MPSUs to the executive officers and 2,000 MPSUs to certain key employees, which represented a target number of shares that could be earned based on the achievement of both market and performance conditions (“2020 MPSUs”). The maximum number of shares that an employee could earn was 500% of the target number of the 2020 MPSUs. The market conditions consisted of five stock price targets ranging from $260 to $300 with a performance period through  July 20, 2023, and the performance condition consisted of one business operating goal related to a revenue target for certain customers with a performance period through  December 31, 2021. As of December 31, 2020, the Company had achieved all five price targets and the operating goal, and a total of 221,000 shares were awarded to the employees. 75% of the 2020 MPSUs vested on  July 20, 2023, and 25% of the 2020 MPSUs will vest on  July 20, 2024. All vested shares are subject to a post-vesting sales restriction period of one year. Based on the actual achievement of the market and performance goals, the total stock-based compensation cost for the 2020 MPSUs is $42.1 million.

The Company determined the grant date fair value of the 2020 MPSUs using a Monte Carlo simulation model with the following assumptions: stock price of $248.71, simulation term of 4.0 years, expected volatility of 38.8%, risk-free interest rate of 0.2%, and expected dividend yield of 0.8%. In addition, the grant date fair value included an illiquidity discount of 8.9% to account for the post-vesting sales restrictions.

MSUs

2022 MSUs:

In October 2022, the Compensation Committee cancelled the 2022 Executive PSUs and granted 159,000 MSUs to the executive officers as replacement awards, which represented a target number of shares that could be earned subject to the achievement of both stock price targets and stock performance compared to the companies comprising the Philadelphia Semiconductor Sector Index (“Peer Group”) over a three-year performance period from October 25, 2022 to October 25, 2025 (“2022 Executive MSUs”). The maximum number of shares that an executive officer could earn was 500% of the target number of the 2022 Executive MSUs if: (1) the Company achieved five stock price targets ranging from $455 to $591 at any time during the performance period, and (2) the Company’s total stockholder return ranked in the 50^th percentile or above relative to the Peer Group at the end of the performance period. As of December 31, 2023, price targets one and two have been achieved. Upon achievement of the performance conditions, the 2022 Executive MSUs will fully vest on October 25, 2025. Under modification accounting, the total stock-based compensation cost was $119.2 million, which was subsequently updated to $124.3 million due to a change of application of accounting methodology. The total stock-based compensation cost of $124.3 million included the unamortized expense of $102.8 million related to 2022 Executive PSUs on the modification date and the incremental cost of $21.5 million related to the 2022 Executive MSUs as a result of the modification. 

The Company determined the grant date fair value of the 2022 Executive MSUs using a Monte Carlo simulation model with the following assumptions: stock price of $342.16, simulation term of three years, expected volatility of 54.0%, risk-free interest rate of 4.4%, and an expected dividend yield of 0.9%. There was no illiquidity discount because the awards did not contain any post-vesting sales restrictions.

In February 2022, the Compensation Committee granted 24,000 MSUs to certain non-executive employees, which represented a target number of shares that could be earned upon achievement of stock price targets (“2022 Non-Executive MSUs”). The maximum number of shares that an employee could earn was 500% of the target number of the 2022 Non-Executive MSUs if the Company achieved five stock price targets ranging from $472 to $590 during a performance period from February 3, 2022 to February 3, 2025. As of December 31, 2023, the Company has achieved all stock price targets. The 2022 Non-Executive MSUs will vest in equal amounts on each of the first, second and third anniversaries of February 3, 2025. The total stock-based compensation cost for the 2022 Non-Executive MSUs is $30.1 million.

The Company determined the grant date fair value of the 2022 Non-Executive MSUs using a Monte Carlo simulation model with the following assumptions: stock price of $393.16, simulation term of six years, expected volatility of 39.0%, risk-free interest rate of 1.7%, and expected dividend yield of 0.8%.

2018 MSUs:

In  October 2018, the Compensation Committee granted 60,000 MSUs to the executive officers and 60,000 MSUs to certain non-executive employees, which represented a target number of shares that could be earned upon achievement of stock price targets (“2018 MSUs”). The maximum number of shares that an employee could earn was 500% of the target number of the 2018 MSUs if the Company achieved five stock price targets ranging from $140 to $172 during a performance period from October 26, 2018 to December 31, 2023. As of December 31, 2019, all stock price targets had been achieved and the employees were awarded a total of 600,000 shares. The 2018 MSUs vested on  January 1, 2024, with post-vesting sales restrictions on the vested shares for up to an additional two years. The total stock-based compensation cost for the 2018 MSUs is $38.5 million.

The Company determined the grant date fair value of the 2018 MSUs using a Monte Carlo simulation model with the following assumptions: stock price of $108.43, expected volatility of 31.6%, a risk-free interest rate of 3.0%, and an illiquidity discount of 8.7% to account for the post-vesting sales restrictions. 

2013 MSUs:

In December 2013, the Compensation Committee granted 276,000 MSUs to the executive officers and 84,000 MSUs to certain non-executive employees, which represented a target number of shares that could be earned upon achievement of stock price targets (“2013 MSUs”). The maximum number of shares that an employee could earn was 500% of the target number of the 2013 MSUs if the Company achieved five price targets ranging from $40 to $56 during a performance period from January 1, 2014 to December 31, 2018. As of December 31, 2015, all stock price targets had been achieved and the employees were awarded a total of 1.8 million shares. The 2013 MSUs vested quarterly from January 1, 2019 to December 31, 2023. The total stock-based compensation cost for the 2013 MSUs is $38.1 million.

The Company determined the grant date fair value of the 2013 MSUs using a Monte Carlo simulation model with the following assumptions: stock price of $31.73, expected volatility of 38.7% and a risk-free interest rate of 1.6%. There was no illiquidity discount because the awards did not contain any post-vesting sales restrictions.

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ESPP

In April 2023, the Board of Directors approved, subject to stockholder approval, the amendment and restatement of the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan (the “Amended 2004 ESPP”). The Amended 2004 ESPP, which was subsequently approved by the Company’s stockholders on June 15, 2023, became effective on August 16, 2023, after the final purchase period of the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan (the “2004 ESPP”). The 2004 ESPP provided for an annual increase by an amount equal to the least of one million shares, 2% of the outstanding shares of common stock on the first day of the year, or a number of shares as determined by the Board of Directors. This evergreen provision was removed in the Amended 2004 ESPP. The Amended 2004 ESPP further provides for the issuance of up to 4.4 million shares of the Company’s common stock and will expire on August 16, 2038.

Under both ESPPs, eligible employees may purchase common stock through payroll deductions. Participants may not purchase more than 2,000 shares in a six-month offering period, or purchase shares having a value greater than $25,000 in any calendar year as measured at the beginning of the offering period in accordance with the IRC and applicable treasury regulations. As of December 31, 2023, 4.4 million shares were available for future issuance under the Amended 2004 ESPP.

For the years ended December 31, 2023, 2022 and 2021, 17,000, 14,000 and 17,000 shares, respectively, were issued under the 2004 ESPP and the Amended 2004 ESPP. The intrinsic value of the shares issued was $1.4 million, $1.6 million and $2.4 million for the years ended December 31, 2023, 2022 and 2021, respectively. As of December 31, 2023, the unamortized expense was $0.4 million, which will be recognized through the first quarter of 2024. The Black-Scholes model was used to value the employee stock purchase rights with the following weighted-average assumptions: 

	Year Ended December 31,
	2023			2022			2021
Expected term (in years)		0.5			0.5			0.5
Expected volatility		53.3	%		50.6	%		43.2	%
Risk-free interest rate		5.3	%		1.9	%		0.1	%
Dividend yield		0.8	%		0.6	%		0.6	%

Cash proceeds from the shares issued under the 2004 ESPP and the Amended 2004 ESPP were $7.6 million, $5.9 million and $4.7 million for the years ended December 31, 2023, 2022 and 2021, respectively.

8. STOCKHOLDER’ EQUITY

Cash Dividend Program

The Company has a dividend program approved by the Board of Directors, pursuant to which the Company intends to pay quarterly cash dividends on its common stock. Based on the Company’s historical practice, stockholders of record as of the last business day of the quarter are entitled to receive the quarterly cash dividends when and if declared by the Board of Directors, which are payable to the stockholders in the following month. The Board of Directors declared the following cash dividends (in thousands, except per share amounts): 

	Year Ended December 31,
	2023		2022		2021
Dividend declared per share	$	4.00	$	3.00	$	2.40
Total amount	$	190,642	$	140,337	$	110,206

As of  December 31, 2023 and 2022, accrued dividends totaled $47.9 million and $35.3 million, respectively.

The declaration of any future cash dividends is at the discretion of the Board of Directors and will depend on, among other things, the Company’s financial condition, results of operations, capital requirements, business conditions, and other factors that the Board of Directors  may deem relevant, as well as a determination that cash dividends are in the best interests of the Company’s stockholders.

The Company anticipates that cash used for future dividend payments will come from its domestic cash, cash generated from ongoing U.S. operations, and cash repatriated from its Bermuda subsidiary. The Company also anticipates that earnings from other foreign subsidiaries will continue to be indefinitely reinvested.

Cash Dividend Equivalent Rights

The Company’s RSUs contain rights to receive cash dividend equivalents, which entitle employees who hold RSUs to the same dividend value per share as holders of common stock. The dividend equivalents are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do not fulfill the requisite service requirement and, as a result, the awards do not vest. As of  December 31, 2023 and 2022, accrued dividend equivalents totaled $11.9 million and $13.8 million, respectively.

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Stock Repurchase Program

In October 2023, the Board of Directors approved a new stock repurchase program authorizing the Company to repurchase up to $640.0 million in the aggregate of its common stock through October 29, 2026. Shares are retired upon repurchase. The Company repurchased approximately 7,000 shares of its common stock for an aggregate purchase price of $3.7 million during the year ended December 31, 2023. 

Stock repurchased under the program may be made through open market repurchases, privately negotiated transactions or other structures in accordance with applicable state and federal securities laws, at times and in amounts as management deems appropriate. The timing and the number of any repurchased common stock will be determined by the Company’s management based on its evaluation of market conditions, legal requirements, share price, and other factors. The repurchase program does not obligate the Company to purchase any particular number of shares and may be suspended, modified, or discontinued at any time without prior notice.

The U.S. IRA requires a 1% excise tax of the value of certain stock repurchases in excess of stock issued for employee compensation made after December 31, 2022. This provision did not have an impact on the Company’s consolidated financial statements.

9. OTHER INCOME (EXPENSE), NET

The components of other income (expense), net, are as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
Interest income	$	23,363		$	14,369		$	11,637
Amortization of discount (premium) on available-for-sale securities, net		5,277			(4,375	)		(4,674	)
Gain (loss) on deferred compensation plan investments		8,505			(6,600	)		4,563
Charitable contributions		(14,850	)		(5,900	)		(1,500	)
Gain on sale of equity investment		1,424			-			-
Other		386			658			(224	)
Total	$	24,105		$	(1,848	)	$	9,802

10.  NET INCOME PER SHARE

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):

	Year Ended December 31,
	2023		2022		2021
Numerator:
Net income	$	427,374	$	437,672	$	242,023
Denominator:
Weighted-average outstanding shares - basic		47,610		46,727		45,851
Effect of dilutive securities		1,161		1,631		2,038
Weighted-average outstanding shares - diluted		48,771		48,358		47,889
Net income per share:
Basic	$	8.98	$	9.37	$	5.28
Diluted	$	8.76	$	9.05	$	5.05

Anti-dilutive common stock equivalents were not material for the periods presented.

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11.  INCOME TAXES

The components of income before income taxes are as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
United States	$	(15,066	)	$	(30,190	)	$	(15,542	)
Foreign		520,907			555,127			287,761
Income before income taxes	$	505,841		$	524,937		$	272,219

The components of the income tax expense are as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
Current:
Federal	$	61,064		$	95,176		$	24,955
State		4,257			12			35
Foreign		5,702			5,019			3,801
Deferred:
Federal		(1,705	)		(8,523	)		4,929
State		(744	)		-			-
Foreign		9,893			(4,419	)		(3,524	)
Income tax expense	$	78,467		$	87,265		$	30,196

The effective tax rate differs from the applicable U.S. statutory federal income tax rate as follows:

	Year Ended December 31,
	2023			2022			2021
U.S. statutory federal tax rate		21.0	%		21.0	%		21.0	%
Foreign income at lower rates		(21.9	)		(22.8	)		(23.2	)
GILTI		13.5			16.0			11.4
Changes in valuation allowance		2.9			0.2			0.5
Stock-based compensation		2.2			2.8			1.6
Return to provision true-up adjustment		(2.0	)		-			(1.1	)
Tax credits, net of reserves		(1.1	)		(1.2	)		(0.5	)
State income taxes		-			(0.2	)		1.6
Other adjustments		0.9			0.8			(0.2	)
Effective tax rate		15.5	%		16.6	%		11.1	%

The prior years’ return to provision true-up adjustment has been disaggregated to conform with the current-year presentation.

The components of net deferred tax assets consist of the following (in thousands):

	December 31,
	2023			2022
Deferred tax assets:
Tax credits	$	37,518		$	32,037
Stock-based compensation		3,404			2,900
Deferred compensation		11,126			9,844
Net operating losses		12,115			9,000
Other expenses not currently deductible		7,755			8,891
Deferred tax assets, gross		71,918			62,672
Valuation allowance		(35,008	)		(20,321	)
Deferred tax assets, net of valuation allowance		36,910			42,351
Deferred tax liabilities:
Depreciation and amortization		(6,420	)		(5,927	)
Undistributed foreign earnings		(817	)		(358	)
Other expenses currently deductible		(1,619	)		(814	)
Deferred tax liabilities		(8,856	)		(7,099	)
Net deferred tax assets	$	28,054		$	35,252

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GILTI:

The Company accounts for GILTI as a period cost. 

Valuation Allowance:

The Company periodically evaluates its deferred tax assets, including a determination of whether a valuation allowance is necessary, based upon its ability to utilize the assets using a more likely than not analysis. The realizability of the Company’s net deferred tax assets is dependent on its ability to generate sufficient future taxable income during periods prior to the expiration of tax attributes to fully utilize these assets. As of December 31, 2023 and 2022, the Company has evaluated the realization of its deferred tax assets and recorded a valuation allowance for assets that do not meet the more-likely-than-not recognition threshold. 

A reconciliation of the beginning and ending balance of valuation allowances is as follows (in thousands):

Period	Balance at Beginning of Period		Additions		Reductions			Balance at End of Period
Year ended December 31, 2021	$	18,190	$	1,560	$	(230	)	$	19,520
Year ended December 31, 2022	$	19,520	$	1,743	$	(942	)	$	20,321
Year ended December 31, 2023	$	20,321	$	15,405	$	(718	)	$	35,008

The additions in 2023 were primarily the result of a change in foreign tax law in 2023 that negatively impacted the realizability of foreign deferred tax assets.

Undistributed Earnings of Subsidiaries:

The Company has analyzed its global working capital and cash requirements, and has determined that it plans to repatriate cash from its Bermuda subsidiary on an ongoing basis to fund its future U.S.-based expenditures and dividends. For the years ended December 31, 2023 and 2021, the Company repatriated $140.0 million and $70.0 million from its Bermuda subsidiary, respectively. No cash was repatriated from the subsidiary during the year ended December 31, 2022.

For all other foreign subsidiaries, the Company expects to indefinitely reinvest undistributed earnings to fund their operations and R&D. As of December 31, 2023 and 2022, the undistributed earnings were approximately $85.0 million and $67.4 million, respectively. An actual repatriation of the undistributed earnings could be subject to additional foreign withholding taxes and U.S. state taxes. The Company expects to be able to take a dividend received deduction to offset any U.S. federal income tax liability on the undistributed earnings. Determination of the unrecognized state and withholding deferred tax liability is not practicable at this time due to the complexities associated with the hypothetical calculation.

Other Income Tax Provision Matters

As of December 31, 2023, the Company did not have federal net operating loss carryforwards. As of December 31, 2023, the state net operating loss carryforwards for income tax purposes were $3.6 million, which will expire beginning in 2029. As of December 31, 2023, the Company has foreign net operating loss carryforwards for income tax purposes of $92.7 million, which will expire beginning in 2029. 

As of December 31, 2023, the Company had no R&D tax credit carryforwards for federal income tax purposes, and $40.6 million for state income tax purposes, which can be carried forward indefinitely.

In the event of a change in ownership, as defined under federal and state tax laws, the Company’s net operating loss and tax credit carryforwards could be subject to annual limitations. The annual limitations could result in the expiration of the net operating loss and tax credit carryforwards prior to utilization.

  

As of December 31, 2023, the Company had $62.7 million of unrecognized tax benefits, $48.9 million of which would affect its effective tax rate if recognized after considering the valuation allowance. As of December 31, 2022, the Company had $49.3 million of unrecognized tax benefits, $38.3 million of which would affect its effective tax rate if recognized after considering the valuation allowance. 

A reconciliation of the gross unrecognized tax benefits is as follows (in thousands): 

Balance as of January 1, 2021	$	33,499
Increase for tax position of current year		9,191
Decrease for tax position of prior year		(657	)
Decrease due to settlement with tax authorities		(54	)
Decrease due to lapse of statute of limitation		(458	)
Balance as of December 31, 2021		41,521
Increase for tax position of current year		10,965
Increase for tax position of prior year		247
Decrease due to settlement with tax authorities		(970	)
Decrease due to lapse of statute of limitation		(2,486	)
Balance as of December 31, 2022		49,277
Increase for tax position of current year		14,108
Increase for tax position of prior year		2,209
Decrease due to lapse of statute of limitation		(1,926	)
Decrease for tax positions of prior year		(1,008	)
Balance as of December 31, 2023	$	62,660

The Company recognizes interest and penalties, if any, related to uncertain tax positions in its income tax provision. As of December 31, 2023 and 2022, the Company has $5.7 million and $4.3 million, respectively, of accrued interest related to uncertain tax positions, which were recorded in income tax liabilities on the Consolidated Balance Sheets.

  

Uncertain tax positions relate to the allocation of income and deductions among the Company’s global entities and to the determination of the R&D tax credit. It is reasonably possible that the balance of gross unrecognized tax benefits could significantly change in the next 12 months. However, it is not possible to determine either the magnitude or the range of increases or decreases at this time.

  

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The Company currently has reduced tax rates in its subsidiaries in Chengdu and Hangzhou, China through 2026 and 2024, respectively, for performing R&D activities.

On December 27, 2023, the Bermuda CIT Act was enacted and signed into law. It includes a 15% CIT applicable to Bermuda businesses that are MNE with annual revenue of €750M or more beginning in 2025. The Bermuda CIT Act also includes an ETA that requires MNE’s to revalue their assets and liabilities, excluding goodwill, at their fair value as of September 30, 2023. There is an election to opt out of the ETA. As the Bermuda CIT Act is not effective until January 1, 2025, the Company is evaluating whether or not to adopt this ETA. Based on the information available, the Company has not recorded any changes to income tax expense related to the Bermuda CIT Act as of December 31, 2023.

On August 9, 2022, the U.S. government enacted the CHIPS Act to provide certain financial and tax incentives to the semiconductor industry, primarily for manufacturing activities within the United States. On August 16, 2022, the IRA was enacted and signed into law. The IRA, among other things, introduces a new 15% corporate minimum tax, based on adjusted financial statement income of certain large corporations, and imposes a 1% excise tax on certain stock repurchases. This excise tax is effective January 1, 2023. The CHIPS Act and the IRA had no material impact on the income tax provisions, results of operations or financial condition of the Company for the year ended December 31, 2023 and 2022.

Income Tax Examination

The Company is subject to examination of its income tax returns by the IRS and other tax authorities. In general, the tax years for 2007 and forward are open for examination for U.S. federal and state income tax purposes.

12.  COMMITMENTS AND CONTINGENCIES

Warranty and Indemnification Provisions

The changes in warranty reserves are as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
Balance at beginning of period	$	24,082		$	20,989		$	6,895
Warranties issued		2,929			3,092			10,558
Repairs, replacement and refund		(2,708	)		(2,357	)		(1,770	)
Changes in liability for pre-existing warranties		(7,397	)		2,358			5,306
Balance at end of period	$	16,906		$	24,082		$	20,989

Changes in liability for pre-existing warranties result from changes in estimates for warranties issued in prior periods.

The Company provides indemnification agreements to certain direct or indirect customers. The Company agrees to reimburse these parties for any damages, costs and expenses incurred by them as a result of legal actions taken against them by third parties for infringing upon their intellectual property rights as a result of using the Company’s products and technologies. These indemnification provisions are varied in scope and are subject to certain terms, conditions, limitations and exclusions. In addition, the Company has entered into indemnification agreements with its directors and officers.

It is not possible to predict the maximum potential amount of future payments under these agreements due to the limited history of indemnification claims and the unique facts and circumstances involved in each particular agreement. There were no indemnification liabilities incurred for the periods presented. However, there can be no assurances that the Company will not incur any financial liabilities in the future as a result of these obligations.

Purchase Commitments

The Company has outstanding purchase obligations with its suppliers and other parties that require the purchases of goods or services. The purchase obligations primarily consist of wafer and other inventory purchases, assembly and other manufacturing services, construction of manufacturing and R&D facilities, purchases of production and other equipment, and license arrangements.

In May 2022, the Company entered into a long-term supply agreement in order to secure manufacturing production capacity for silicon wafers over a four-year period. As of December 31, 2023, the Company had remaining prepayments under this agreement of $120.0 million reported in other long-term assets on the Consolidated Balance Sheet.

Total estimated future unconditional purchase commitments to all suppliers and other parties, net of the $120.0 million prepayment, as of December 31, 2023 were as follows (in thousands):

2024	$	367,842
2025		298,958
2026		1,668
2027		31,266
Total	$	699,734

Litigation

The Company is a party to actions and proceedings in the ordinary course of business, including challenges to the enforceability or validity of its intellectual property, claims that the Company’s products infringe on the intellectual property rights of others, and employment matters. The Company may also be subject to litigation initiated by its stockholders. These proceedings often involve complex questions of fact and law and may require the expenditure of significant funds and the diversion of other resources to prosecute and defend. The Company defends itself vigorously against any such claims. As of December 31, 2023, there were no material pending legal proceedings to which the Company was a party.

70

 

13.  EMPLOYEE 401(k) PLAN

The Company sponsors a 401(k) retirement savings plan for all employees in the U.S. who meet certain eligibility requirements. Participants may contribute up to the amount allowable as a deduction for federal income tax purposes. The Company is not required to contribute and did not contribute to the plan for the years ended December 31, 2023, 2022 and 2021. 

14.  SIGNIFICANT CUSTOMERS

The Company sells its products primarily through third-party distributors and value-added resellers, and directly to OEMs, ODMs and EMS providers. The following table summarizes those customers with sales equal to 10% or more of the Company’s total revenue: 

	Year Ended December 31,
Customer	2023			2022			2021
Distributor A		26	%		24	%		26	%
Distributor B		19	%		19	%		15	%
Distributor C		10	%		*			10	%

* Represents less than 10%.

The Company’s agreements with these third-party customers were made in the ordinary course of business and  may be terminated with or without cause by these customers with advance notice. Although the Company  may experience a short-term disruption in the distribution of its products and a short-term decline in revenue if its agreement with any of the distributors were terminated, the Company believes that such termination would not have a material adverse effect on its financial statements because it would be able to engage alternative distributors, resellers and other distribution channels to deliver its products to end customers within a short period following any termination of the agreement with a distributor.

The following table summarizes those customers with accounts receivable equal to 10% or more of the Company’s total accounts receivable:  

	December 31,
Customer		2023		2022
Distributor A		42	%	29	%
Distributor B		13	%	23	%
Distributor C		10	%	*

* Represents less than 10%.

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15.  SEGMENT AND GEOGRAPHIC INFORMATION

The Company operates in one reportable segment that includes the design, development, marketing and sale of high-performance, semiconductor-based power electronic solutions for the storage and computing, enterprise data, automotive, industrial, communications and consumer markets. The Company’s chief operating decision maker is its Chief Executive Officer, who reviews financial information presented on a consolidated basis for the purposes of allocating resources and evaluating financial performance. The Company derives a majority of its revenue from sales to customers located outside North America, with geographic revenue based on the customers’ ship-to locations.  

The following is a summary of revenue by geographic region (in thousands):

	Year Ended December 31,
Country or Region	2023		2022		2021
China	$	934,768	$	938,946	$	700,985
Taiwan		307,499		233,040		169,130
South Korea		169,867		189,478		93,027
Europe		132,620		145,584		85,201
United States		97,294		99,804		35,770
Japan		93,340		91,048		68,720
Southeast Asia		85,150		95,739		54,611
Other		534		509		354
Total	$	1,821,072	$	1,794,148	$	1,207,798

The following is a summary of revenue by major product family (in thousands):

	Year Ended December 31,
Product Family	2023		2022		2021
DC to DC	$	1,718,623	$	1,696,594	$	1,147,329
Lighting Control		102,449		97,554		60,469
Total	$	1,821,072	$	1,794,148	$	1,207,798

The following is a summary of long-lived assets by geographic region (in thousands): 

	December 31,
Country	2023		2022		2021
China	$	184,685	$	200,508	$	211,973
United States		119,430		113,996		113,805
Taiwan		39,419		20,074		19,607
Other		25,418		22,579		17,577
Total	$	368,952	$	357,157	$	362,962

16. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table summarizes the changes in accumulated other comprehensive income (loss) (in thousands):

	Unrealized Losses on Available-for-Sale Securities			Foreign Currency Translation Adjustments			Total
Balance as of January 1, 2022	$	(1,063	)	$	16,943		$	15,880
Other comprehensive loss before reclassifications		(6,944	)		(32,293	)		(39,237	)
Amounts reclassified from accumulated other comprehensive loss		96			-			96
Tax effect		184			-			184
Net current period other comprehensive loss		(6,664	)		(32,293	)		(38,957	)
Balance as of December 31, 2022		(7,727	)		(15,350	)		(23,077	)
Other comprehensive income (loss) before reclassifications		6,896			(9,528	)		(2,632	)
Amounts reclassified from accumulated other comprehensive income		(1	)		-			(1	)
Tax effect		(1,352	)		-			(1,352	)
Net current period other comprehensive income (loss)		5,543			(9,528	)		(3,985	)
Balance as of December 31, 2023	$	(2,184	)	$	(24,878	)	$	(27,062	)

The amounts reclassified from accumulated other comprehensive income (loss) were recorded in other income (expense), net, on the Consolidated Statements of Operations.  

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17. SUBSEQUENT EVENTS

Acquisition 

In January 2024, the Company completed the acquisition of Axign in a cash transaction in exchange for all outstanding Axign shares. Axign is a Dutch company that designs and develops class-D audio ICs, targeting applications ranging from portable consumer speakers to automotive and professional-grade multi-speaker systems. The preliminary total purchase consideration was approximately $33.8 million. The initial accounting for the acquisition, including the valuation of assets acquired and liabilities assumed, is still ongoing as of the date this Annual Report on Form 10-K is issued.

Cash Dividend Increase

In February 2024, the Board of Directors approved an increase in quarterly cash dividends from $1.00 per share to $1.25 per share.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures pursuant to Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934 as of the end of the period covered by this Annual Report on Form 10-K. 

Based on this evaluation, and due to the finding of the material weakness described below, our Chief Executive Officer and Chief Financial Officer concluded that, as of December 31, 2023, our disclosure controls and procedures were not effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms.

Notwithstanding the material weakness in internal control over financial reporting described below, management believes and has concluded that the consolidated financial statements included in this Annual Report on Form 10-K fairly present, in all material respects, our financial position, results of operations and cash flows for the periods presented in conformity with GAAP.

Management’s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our management conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. 

During the year-end financial reporting process of fiscal 2023, a material weakness was identified in internal control over financial reporting within the Company’s demand forecast process regarding excess and obsolete inventory. The material weakness resulted from ineffective design of the controls related to management’s review and documentation of the Company’s inventory demand information and other assumptions used to determine the inventory carrying value adjustments necessary to record such quantities at the lower of their cost or net realizable value.

A material weakness is a deficiency, or a combination of deficiencies in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of our annual or interim consolidated financial statements will not be prevented or detected on a timely basis. We do not believe that this material weakness resulted in any material errors. 

Ernst & Young LLP independently assessed the effectiveness of our internal control over financial reporting, as stated in the firm’s attestation report, which appears in Part II, Item 8 of this Annual Report on Form 10-K.

Remediation

Management has been implementing and continues to implement measures designed to ensure that control deficiencies contributing to the material weakness are remediated, such that these controls are designed, implemented, and operating effectively. These remediation actions are ongoing and include or are expected to include:

• Increased frequency of inventory reserve calculations and reconcile data between the inventory demand forecast system and our financial system at the same frequency; 

• Amend inventory provision spreadsheet formats to include additional columns and color coding to delineate specific parts and products before and after review, setting dollar thresholds for reserve requirements, and adding a tab for management review comments; and

• Document discussions and proposed actions and follow-up at inventory demand forecast meetings.

As we continue to evaluate and work to improve our internal control over financial reporting, we may decide to take additional measures to address this identified deficiency or modify the remediation plans described above. We believe that these actions will remediate the material weakness, however, the weakness will not be considered remediated until the applicable controls operate for a sufficient period of time and management has concluded, through testing, that these controls are operating effectively. Management believes the foregoing plans will effectively remediate the deficiency constituting the material weakness and believes that the remediation of this material weakness (including necessary testing) will be completed during 2024. However, there is no assurance as to when such remediation will be completed. As the remediation plans are implemented, management may take additional measures or modify the remediation plan elements described above.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during the quarter ended December 31, 2023, that would have materially affected, or were reasonably likely to materially affect, our internal control over financial reporting. However, the Company has initiated enhancements to its internal control over financial reporting to remediate the material weakness described above identified during the year-end financial reporting process of fiscal 2023.

Limitations on Effectiveness of Controls and Procedures

In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints, and that management is required to apply its judgment in evaluating the benefits of possible controls and procedures relative to their costs. 

Item 9B. Other Information

10b5-1 Trading Plans

Certain of our executive officers have entered into trading plans pursuant to Rule 10b5-1(c) of the Securities Exchange Act of 1934, as amended. A trading plan is a written document that pre-establishes the amounts, prices and dates (or formula for determining the amounts, prices and dates) of future purchases or sales of our common stock, including the sale of shares acquired pursuant to the 2004 ESPP and the Amended 2004 ESPP, and upon vesting of RSUs. During the three months ended December 31, 2023, no director or officer of the Company adopted, modified or terminated trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) as defined in Item 408(a) of Regulation S-K. During the three months ended December 31, 2023, no pre-existing trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) were modified or terminated, and no other written trading arrangements that are not intended to qualify for the Rule 10b5-1(c) affirmative defense were adopted, modified, or terminated.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicable.

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PART III

Item 10. Directors, Executive Officers and Corporate Governance

Reference is made to the information regarding directors and nominees, code of ethics, corporate governance matters and disclosure relating to compliance with Section 16(a) of the Securities Exchange Act of 1934 appearing under the captions “Election of Directors” and “Delinquent Section 16(a) Reports” in the Company’s Proxy Statement for its 2024 Annual Meeting of Stockholders (the “2024 Annual Meeting”), which information is incorporated in this Annual Report on Form 10-K by reference. Information regarding executive officers is set forth under the caption “Information about Executive Officers” in Part I of this Annual Report on Form 10-K.

Item 11. Executive Compensation

The information required by this item will be set forth under the caption “Executive Officer Compensation” in the Company’s Proxy Statement for the 2024 Annual Meeting, and is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information required by this item will be set forth under the captions “Security Ownership of Certain Beneficial Owners and Management” and “Equity Compensation Plan Information” in the Company’s Proxy Statement for the 2024 Annual Meeting, and is incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions, and Director Independence

The information required by this item will be set forth under the captions “Certain Relationships and Related Transactions” and “Election of Directors” in the Company’s Proxy Statement for the 2024 Annual Meeting, and is incorporated herein by reference.

Item 14. Principal Accountant Fees and Services

The information required by this item will be set forth under the caption “Audit and Other Fees” in the Company’s Proxy Statement for the 2024 Annual Meeting, and is incorporated herein by reference.

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PART IV

Item 15. Exhibits and Financial Statement Schedules

(a) Documents filed as part of this report

(1) All financial statements

	Page
Reports of Independent Registered Public Accounting Firm (PCAOB ID: 42)	42
Consolidated Balance Sheets	44
Consolidated Statements of Operations	45
Consolidated Statements of Comprehensive Income	46
Consolidated Statements of Stockholders’ Equity	47
Consolidated Statements of Cash Flows	48
Notes to Consolidated Financial Statements	49

(2) Financial Statement Schedules

All schedules have been omitted because they are not required, not applicable, or the information required is otherwise included in the consolidated financial statements or notes thereto.

(3) Exhibits

Exhibit Number	Description
3.1 (1)	Amended and Restated Certificate of Incorporation.
3.2 (2)	Amended and Restated Bylaws of Monolithic Power Systems, Inc., effective April 26, 2022.
4.1 (3)	Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934.
10.1+ (4)	Registrant’s 2004 Employee Stock Purchase Plan and form of subscription agreement.
10.2+ (5)	Form of Directors’ and Officers’ Indemnification Agreement.
10.3+ (6)	Employment Agreement with Michael Hsing, and Amendment thereof.
10.4+ (7)	Employment Agreement with Maurice Sciammas, and Amendment thereof.
10.5+ (8)	Employment Agreement with Jim Moyer.
10.6+(9)	Employment Agreement with Deming Xiao, and Amendment thereof.
10.7+(10)	Letter Agreement with Victor Lee.
10.8+(11)	Letter Agreement with Jeff Zhou.
10.9+(12)	Monolithic Power Systems, Inc. Master Cash Performance Bonus Plan.
10.10+(13)	Letter Agreement with Eugen Elmiger.
10.11+(14)	Monolithic Power Systems, Inc. 2004 Equity Incentive Plan, as Amended, and Form of Grant Agreement.
10.12+(15)	Monolithic Power Systems, Inc. 2014 Equity Incentive Plan, as Amended, and Form of Grant Agreement.

75

10.13+(16)	Employment Agreement with Bernie Blegen.
10.14+(17)	Employment Agreement with Saria Tseng and Amendment thereof.
10.15+(18)	Monolithic Power Systems, Inc. Amended and Restated 2014 Equity Incentive Plan.
10.16+(19)	Form of Grant Agreement for grants of Performance Stock Units under the Monolithic Power Systems, Inc. Amended and Restated 2014 Equity Incentive Plan.
10.17+(20)	Letter Agreement with Carintia Martinez.
10.18+(21)	Indemnification Agreement with Carintia Martinez.
10.19+(22)	Letter Agreement with Eileen Wynne.
10.20+(23)	Indemnification Agreement with Eileen Wynne.
10.21+(24)	Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan, Amended and Restated as of August 16, 2023.
21.1	Subsidiaries of Monolithic Power Systems, Inc.
23.1	Consent of Independent Registered Public Accounting Firm.
24.1	Power of Attorney (included on Signature page to this Form 10-K).
31.1	Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
97.1	Monolithic Power Systems, Inc. Compensation Clawback Policy
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 (formatted as Inline XBRL and contained in Exhibit 101)

+	Management contract or compensatory plan or arrangement.
*	This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference in any filings under the Securities Act of 1933 or the Securities Exchange Act of 1934, whether made before or after the date hereof and irrespective of any general incorporation language in any filings.
(1)	Incorporated by reference to Exhibit 3.2 of the Registrant’s Registration Statement on Form S-1/A (Registration No. 333-117327), filed with the Securities and Exchange Commission on November 15, 2004.
(2)	Incorporated by reference to Exhibit 3.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on April 27, 2022.
(3)	Incorporated by reference to Exhibit 4.1 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on February 28, 2020.
(4)	Incorporated by reference to Exhibit 10.3 of the Registrant’s Registration Statement on Form S-1/A (Registration No. 333-117327), filed with the Securities and Exchange Commission on November 15, 2004.

76

(5)	Incorporated by reference to Exhibit 10.4 of the Registrant’s Registration Statement on Form S-1/A (Registration No. 333-117327), filed with the Securities and Exchange Commission on November 15, 2004.
(6)	Incorporated by reference to Exhibit 10.7 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 11, 2008 and Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on December 19, 2008.
(7)	Incorporated by reference to Exhibit 10.8 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 11, 2008 and Exhibit 10.3 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on December 19, 2008.
(8)	Incorporated by reference to Exhibit 10.9 of the Registrant’s Registration Statement on Form S-1 (Registration No. 333-117327), filed with the Securities and Exchange Commission on July 13, 2004.
(9)	Incorporated by reference to Exhibit 10.10 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 11, 2008 and Exhibit 10.4 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on December 19, 2008.
(10)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on September 14, 2006.
(11)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on February 3, 2010.
(12)	Incorporated by reference to Annexure C of the Registrant’s Proxy Statement on Schedule 14A (File No. 000-51026), filed with the Securities and Exchange Commission on April 30, 2013.
(13)	Incorporated by reference to Exhibit 10.36 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 10, 2014.
(14)	Incorporated by reference to Exhibit 4.4 of the Registrant’s Registration Statement on Form S-8 (Registration No. 333-199782), filed with the Securities and Exchange Commission on November 3, 2014.
(15)	Incorporated by reference to Exhibit 4.6 of the Registrant’s Registration Statement on Form S-8 (Registration No. 333-199782), filed with the Securities and Exchange Commission on November 3, 2014.
(16)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on July 22, 2016.
(17)	Incorporated by reference to Exhibit 10.14 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on February 28, 2020.
(18)	Incorporated by reference to Annexure B of the Registrant’s Proxy Statement on Schedule 14A (File No. 000-51026), filed with the Securities and Exchange Commission on April 29, 2020.
(19)	Incorporated by reference to Exhibit 10.3 of the Registrant’s quarterly report on Form 10-Q (File No. 000-51026), filed with the Securities and Exchange Commission on May 5, 2023.
(20)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on May 28, 2021.
(21)	Incorporated by reference to Exhibit 10.2 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on May 28, 2021.
(22)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on February 8, 2023.
(23)	Incorporated by reference to Exhibit 10.2 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on February 8, 2023.
(24)	Incorporated by reference to Exhibit 10.1 of the Registrant’s quarterly report on Form 10-Q (File No. 000-51026), filed with the Securities and Exchange Commission on August 4, 2023.

Item 16. Form 10-K Summary

None.

77

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	MONOLITHIC POWER SYSTEMS, INC.
Date: February 29, 2024	By:	/s/ Michael Hsing
		Michael Hsing
		President and Chief Executive Officer

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Michael Hsing and T. Bernie Blegen, jointly and severally, his or her attorneys-in-fact, each with the power of substitution, for him or her in any and all capacities, to sign any amendments to this report, and to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact, or his or her substitute or substitutes, may do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below on February 29, 2024 by the following persons on behalf of the registrant and in the capacities indicated:

/s/ Michael Hsing	President, Chief Executive Officer, and Director (Principal Executive Officer)
MICHAEL HSING
/s/ T. Bernie Blegen	Chief Financial Officer (Principal Financial and Accounting Officer)
T. BERNIE BLEGEN
/s/ Herbert Chang	Director
HERBERT CHANG
/s/ Eugen Elmiger	Director
EUGEN ELMIGER
/s/ Victor K. Lee	Director
VICTOR K. LEE
/s/ Carintia Martinez	Director
CARINTIA MARTINEZ
/s/ James C. Moyer	Director
JAMES C. MOYER
/s/ Eileen Wynne	Director
EILEEN WYNNE
/s/ Jeff Zhou	Director
JEFF ZHOU

78

EX-21.1

Exhibit 21.1

SUBSIDIARIES OF MONOLITHIC POWER SYSTEMS, INC.

MPS International Ltd. 

MPS International (Shanghai) Ltd. 

Chengdu Monolithic Power Systems Co., Ltd.

MPS International Korea Co., Ltd.

MPS Japan G.K.

MPS Japan K.K.

MPS France SARL

Hangzhou MPS Semiconductor Technology Ltd.

MPS International (Taiwan) Ltd. 

Monolithic Power Systems (Singapore) Pte. Ltd. 

MPS Germany GmbH

MPS Tech Switzerland SARL

Monolithic Power Spain, S.L.

MSN Equipment Leasing LLC

M2 Holding, LLC

EZmotion Technologies, Inc.

MPS Portugal, Unipessoal LDA.

Monolithic Power Malaysia SDN. BHD.

EX-23.1

EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-8 No. 333-240305) pertaining to the Monolithic Power Systems, Inc. amended and restated 2014 Equity Incentive Plan,

(2) Registration Statement (Form S-8 No. 333-199782) pertaining to the Monolithic Power Systems, Inc. 2014 Equity Incentive Plan,

(3) Registration Statement (Form S-8 No. 333-187117) pertaining to the Monolithic Power Systems, Inc. 2004 Equity Incentive Plan and the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan,

(4) Registration Statement (Form S-8 No. 333-180047) pertaining to the Monolithic Power Systems, Inc. 2004 Equity Incentive Plan and the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan,

(5) Registration Statement (Form S-8 No. 333-172013) pertaining to the Monolithic Power Systems, Inc. 2004 Equity Incentive Plan and the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan,

(6) Registration Statement (Form S-8 No. 333-164673) pertaining to the Monolithic Power Systems, Inc. 2004 Equity Incentive Plan and the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan,

(7) Registration Statement (Form S-8 No. 333-157095) pertaining to the Monolithic Power Systems, Inc. 2004 Equity Incentive Plan and the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan,

(8) Registration Statement (Form S-8 No. 333-149027) pertaining to the Monolithic Power Systems, Inc. 2004 Equity Incentive Plan and the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan,

(9) Registration Statement (Form S-8 No. 333-140563) pertaining to the Monolithic Power Systems, Inc. 2004 Equity Incentive Plan and the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan,

(10) Registration Statement (Form S-8 No. 333-132411), as amended, pertaining to the Monolithic Power Systems, Inc. 2004 Equity Incentive Plan and the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan, and

(11) Registration Statement (Form S-8 No. 333-120886) pertaining to the Monolithic Power Systems, Inc. 2004 Equity Incentive Plan, the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan and the Monolithic Power Systems, Inc. 1998 Stock Plan,

of our reports dated February 29, 2024 with respect to the consolidated financial statements of Monolithic Power Systems, Inc., and the effectiveness of internal control over financial reporting of Monolithic Power Systems, Inc. included in this Annual Report (Form 10-K) of Monolithic Power Systems, Inc. for the year ended December 31, 2023.

/s/ Ernst & Young LLP

San Jose, California

February 29, 2024

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) and 15d-14(a), AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Michael Hsing, certify that:

1. I have reviewed this Annual Report on Form 10-K of Monolithic Power Systems, Inc.;

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 registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) 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 registrant 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 registrant, 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 registrant’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 registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’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 registrant’s internal control over financial reporting.

Date: February 29, 2024

/s/ Michael Hsing

Michael Hsing

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) and 15d-14(a), AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, T. Bernie Blegen, certify that:

1. I have reviewed this Annual Report on Form 10-K of Monolithic Power Systems, Inc.;

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 registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) 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 registrant 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 registrant, 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 registrant’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 registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’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 registrant’s internal control over financial reporting.

Date: February 29, 2024

/s/ T. Bernie Blegen

T. Bernie Blegen

Chief Financial Officer

EX-32.1

Exhibit 32.1

The following certification shall not be deemed “filed” for purposes of section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, whether made before or after the date hereof and irrespective of any general incorporation language in any filings.

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND

CHIEF FINANCIAL OFFICER PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of Monolithic Power Systems, Inc., a Delaware corporation, for the year ended December 31, 2023 (the “Report”), as filed with the Securities and Exchange Commission, each of the undersigned officers of Monolithic Power Systems, Inc. certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) the accompanying Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Monolithic Power Systems, Inc. for the periods presented therein.

Date: February 29, 2024

/s/ Michael Hsing

Michael Hsing

Chief Executive Officer

Date: February 29, 2024

/s/ T. Bernie Blegen

T. Bernie Blegen

Chief Financial Officer

EX-97.1

Exhibit 97.1

Monolithic Power Systems, Inc.

Compensation Clawback Policy

Effective October 2, 2023

This Compensation Clawback Policy (this “Policy”) of Monolithic Power Systems, Inc. (the “Company”) has been adopted by the Company’s Board of Directors (“Board”) and is effective as of the date first written above (the “Effective Date”). For purposes of this Policy, the Compensation Committee of the Board is referred to as the “Committee”. This Policy has been adopted, in part, to address final rules and regulations (“Final Regulations”) promulgated by the U.S. Securities and Exchange Commission (the “SEC”) and final listing standards (“Final Listing Standards”) adopted by The NASDAQ Stock Market (“NASDAQ”) to empower the Company to (as further described in the Final Listing Standards) recover certain compensation or other amounts erroneously awarded to an Executive Officer (as defined in the Final Listing Standards, an “Executive Officer”) in the event of an applicable accounting restatement (as described in the Final Listing Standards) (collectively, the “NASDAQ Clawback Requirements”). The applicable provisions of this Policy implementing the NASDAQ Clawback Requirements are generally referred to as the “NASDAQ Clawback Provisions”.

Notwithstanding anything in this Policy to the contrary, this Policy is at all times subject to interpretation and operation in accordance with the Final Regulations, the Final Listing Standards, and any applicable SEC or NASDAQ guidance or interpretations issued from time to time regarding the NASDAQ Clawback Requirements (collectively, the “Final Requirements”). Questions regarding this Policy should be directed to the Company’s General Counsel (or such officer’s successor(s)).

Section 1

A.         Scope. As a general matter, it is the policy of the Company (including under this Policy) to comply with the NASDAQ Clawback Requirements through the operation and enforcement of this Policy and the NASDAQ Clawback Provisions. For purposes of this Policy, the NASDAQ Clawback Requirements are as set forth on Exhibit A to this Policy.

B.         General Statement of NASDAQ Clawback Requirements. Subject to the Final Requirements, the following provisions apply to the Executive Officers (and capitalized (or other key) terms not previously or otherwise defined have the meanings set forth the NASDAQ Clawback Requirements): In general, unless a permissible clawback exception applies, the Company will recover, reasonably promptly, from each Executive Officer the erroneously awarded compensation that was received by such Executive Officer in the event that the Company is required to prepare 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.

Section 2

A.         Administration and Interpretation. The Board or the Committee will administer this Policy in accordance with the Final Requirements and will have full and exclusive authority and discretion to supplement, amend, repeal, interpret, terminate, construe, modify, replace and/or enforce (in whole or in part) this Policy, including the authority to correct any defect, supply any omission or reconcile any ambiguity, inconsistency or conflict in the Policy, subject to the Final Requirements. Further, all reasonable actions, interpretations and determinations taken or made by the Board or the Committee regarding this Policy will be final, conclusive and binding.

B.         Offset Only in Compliance with Section 409A. The Board or the Committee will have the authority to offset any compensation or benefit amounts that becomes due to the applicable Executive Officer to the extent permissible under Section 409A of the Internal Revenue Code of 1986, as amended, and as it deems necessary or desirable to recover any compensation under this Policy.

C.         Acknowledgment and Consent. Each Executive Officer, upon being so designated or assuming such position, is required to execute and deliver to the Company’s General Counsel (or such officer’s successor(s)) an acknowledgment of and consent to this Policy, in a form reasonably acceptable to and provided by the Company from time to time: (1) acknowledging and consenting to be bound by the terms of this Policy; (2) agreeing to fully cooperate with the Company in connection with any of such officer’s obligations to the Company pursuant to this Policy; (3) agreeing that the Company may enforce its rights under this Policy through any and all reasonable means permitted under applicable law as it deems necessary or desirable under this Policy; and (4) acknowledging and agreeing that such officer has reviewed the Policy carefully and has had a chance to consult an attorney (or any other professionals whose advice he or she values regarding this Policy, such as an accountant or financial advisor) before executing such acknowledgment of and consent to this Policy.

D.         Relationship of This Policy to Prior Clawback Policy. This Policy succeeds, as of the Effective Date, as described herein, the Company’s Compensation Recoupment Policy first adopted in February 2012 and applicable under certain circumstances described therein (the “Prior Clawback Policy”) with respect to the compensation recoupment required under this Policy. The Prior Clawback Policy shall be in force and effect prior to the Effective Date with respect to any compensation recoupment covered by the Prior Clawback Policy, and the Prior Clawback Policy shall not continue in force and effect on or after the Effective Date with respect to any compensation recoupment covered by the Prior Clawback Policy but not covered by this Policy. For purposes of clarification, to the extent any compensation or other amounts or Executive Officers are covered by or subject to the NASDAQ Clawback Provisions by this Policy’s terms, the Prior Clawback Policy will operate (if at all) only after, and (if at all) as a supplement to (as opposed to superseding and/or replacing), the NASDAQ Clawback Provisions regarding such compensation or other amounts or Executive Officers.

EXHIBIT A

5608. Recovery of Erroneously Awarded Compensation

(a) Preamble. As required by SEC Rule 10D-1, this Rule 5608 requires Companies to adopt a compensation recovery policy, comply with that policy, and provide the compensation recovery policy disclosures required by this rule and in the applicable Commission filings.

(b) Recovery of Erroneously Awarded Compensation. Each Company must:

(1)         Adopt and comply with a written policy providing that the Company will recover reasonably promptly the amount of erroneously awarded incentive-based compensation in the event that the Company is required to prepare 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.

(i)         The Company’s recovery policy must apply to all incentive-based compensation received by a person: (A) After beginning service as an executive officer; (B) Who served as an executive officer at any time during the performance period for that incentive-based compensation; (C) While the Company has a class of securities listed on a national securities exchange or a national securities association; and (D) During the three completed fiscal years immediately preceding the date that the Company is required to prepare an accounting restatement as described in paragraph (b)(1) of this Rule. In addition to these last three completed fiscal years, the recovery policy must apply to any transition period (that results from a change in the Company’s fiscal year) within or immediately following those three completed fiscal years. However, a transition period between the last day of the Company’s previous fiscal year end and the first day of its new fiscal year that comprises a period of nine to 12 months would be deemed a completed fiscal year. A Company’s obligation to recover erroneously awarded compensation is not dependent on if or when the restated financial statements are filed.

(ii)         For purposes of determining the relevant recovery period, the date that a Company is required to prepare an accounting restatement as described in paragraph (b)(1) of this Rule is the earlier to occur of: (A) The date the Company’s board of directors, a committee of the board of directors, or the officer or officers of the Company authorized to take such action if board action is not required, concludes, or reasonably should have concluded, that the Company is required to prepare an accounting restatement as described in paragraph (b)(1) of this Rule; or (B) The date a court, regulator, or other legally authorized body directs the Company to prepare an accounting restatement as described in paragraph (b)(1) of this Rule.

(iii)         The amount of incentive-based compensation that must be subject to the Company’s recovery policy (“erroneously awarded compensation”) is the amount of incentive-based compensation received that exceeds the amount of incentive-based compensation that otherwise would have been received had it been determined based on the restated amounts, and must be computed without regard to any taxes paid. For 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 an accounting restatement: (A) The amount must be based on a reasonable estimate of the effect of the accounting restatement on the stock price or total shareholder return upon which the incentive-based compensation was received; and (B) The Company must maintain documentation of the determination of that reasonable estimate and provide such documentation to Nasdaq.

(iv)         The Company must recover erroneously awarded compensation in compliance with its recovery policy except to the extent that the conditions of paragraphs (b)(1)(iv)(A), (B), or (C) of this Rule are met, and the Company’s Compensation Committee, or in the absence of such a committee, a majority of the independent directors serving on the board, has made a determination that recovery would be impracticable.

(A)         The direct expense paid to a third party to assist in enforcing the policy would exceed the amount to be recovered. Before concluding that it would be impracticable to recover any amount of erroneously awarded compensation based on expense of enforcement, the Company must make a reasonable attempt to recover such erroneously awarded compensation, document such reasonable attempt(s) to recover, and provide that documentation to Nasdaq.

(B)         Recovery would violate home country law where that law was adopted prior to November 28, 2022. Before concluding that it would be impracticable to recover any amount of erroneously awarded compensation based on violation of home country law, the Company must obtain an opinion of home country counsel, acceptable to Nasdaq, that recovery would result in such a violation, and must provide such opinion to Nasdaq.

(C)         Recovery would likely cause an otherwise tax-qualified retirement plan, under which benefits are broadly available to employees of the registrant, to fail to meet the requirements of 26 U.S.C. 401(a)(13) or 26 U.S.C. 411(a) and regulations thereunder.

(v)         The Company is prohibited from indemnifying any executive officer or former executive officer against the loss of erroneously awarded compensation.

(2)         File all disclosures with respect to such recovery policy in accordance with the requirements of the Federal securities laws, including the disclosure required by the applicable Commission filings.

(c) General Exemptions. The requirements of this Rule 5608 do not apply to the listing of:

(1)         Any security issued by a unit investment trust, as defined in 15 U.S.C. 80a-4(2); and

(2)         Any security issued by a management company, as defined in 15 U.S.C. 80a-4(3), that is registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8), if such management company has not awarded incentive-based compensation to any executive officer of the company in any of the last three fiscal years, or in the case of a company that has been listed for less than three fiscal years, since the listing of the company.

(d) Definitions. Unless the context otherwise requires, the following definitions apply for purposes of this Rule 5608 (and only for purposes of this Rule 5608):

Executive Officer. An executive officer is 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 policymaking functions for the Company. Executive officers of the Company’s parent(s) or subsidiaries are deemed executive officers of the Company if they perform such policy making functions for the Company. In addition, when the Company is a limited partnership, officers or employees of the general partner(s) who perform policy-making functions for the limited partnership are deemed officers of the limited partnership. When the Company is a trust, officers, or employees of the trustee(s) who perform policymaking functions for the trust are deemed officers of the trust. Policy-making function is not intended to include policy-making functions that are not significant. Identification of an executive officer for purposes of this Rule would include at a minimum executive officers identified pursuant to 17 CFR 229.401(b).

Financial Reporting Measures. Financial reporting measures are measures that are determined and presented in accordance with the accounting principles used in preparing the Company’s financial statements, and any measures that are derived wholly or in part from such measures. Stock price and total shareholder return are also financial reporting measures. A financial reporting measure need not be presented within the financial statements or included in a filing with the Commission.

Incentive-Based Compensation. Incentive-based compensation is any compensation that is granted, earned, or vested based wholly or in part upon the attainment of a financial reporting measure.

Received. Incentive-based compensation is deemed received in the Company’s fiscal period during which the financial reporting measure specified in the incentive-based compensation award is attained, even if the payment or grant of the incentive-based compensation occurs after the end of that period.

(e) Effective Date. Each Company is required to (i) adopt a policy governing the recovery of erroneously awarded compensation as required by this rule no later than 60 days following October 2, 2023, (ii) comply with its recovery policy for all incentive-based compensation received (as such term is defined in Rule 5608(d)) by executive officers on or after October 2, 2023, and (iii) provide the disclosures required by this rule and in the applicable Commission filings on or after October 2, 2023. Notwithstanding the look-back requirement in Rule 5608(b)(1)(i)(D), a Company is only required to apply the recovery policy to incentive-based compensation received on or after October 2, 2023.

* * * * *

Monolithic Power Systems, Inc.

Compensation Clawback Policy

Acknowledgment and Consent

The undersigned hereby acknowledges that he or she has received and reviewed a copy of the Compensation Clawback Policy (the “Policy”) of Monolithic Power Systems, Inc. (the “Company”), effective as of October 2, 2023, as adopted by the Company’s Board of Directors. Terms used but not defined in this document shall have meanings as set forth in the Policy.

Pursuant to such Policy, the undersigned hereby:

● acknowledges that he or she has been designated as (or assumed the position of) a “Executive Officer” as defined in the Policy;

● acknowledges and consents to the Policy;

● acknowledges and consents to be bound by the terms of the Policy;

● agrees to fully cooperate with the Company in connection with any of the undersigned’s obligations to the Company pursuant to the Policy;

● agrees that the Company may enforce its rights under the Policy through any and all reasonable means permitted under applicable law as the Company deems necessary or desirable under the Policy; and

● acknowledges and agrees that he or she has reviewed the Policy carefully and has had a chance to consult an attorney (or any other professionals whose advice he or she values regarding the Policy, such as an accountant or financial advisor) before executing this acknowledgment of and consent to the Policy.

ACKNOWLEDGED AND AGREED:

Name: [NAME]

Date: [DATE]

XML

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 22, 2024	Jun. 30, 2023
Document Information [Line Items]
Entity Central Index Key	0001280452
Entity Registrant Name	MONOLITHIC POWER SYSTEMS INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	000-51026
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0466789
Entity Address, Address Line One	5808 Lake Washington Blvd. NE
Entity Address, City or Town	Kirkland
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98033
City Area Code	425
Local Phone Number	296-9956
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	MPWR
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 16,400,000,000
Entity Common Stock, Shares Outstanding		48,661,000
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	San Jose, California

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 527,843	$ 288,607
Short-term investments	580,633	449,266
Accounts receivable, net	179,858	182,714
Inventories	383,702	447,290
Other current assets	147,463	42,742
Total current assets	1,819,499	1,410,619
Property and equipment, net	368,952	357,157
Goodwill	6,571	6,571
Deferred tax assets, net	28,054	35,252
Other long-term assets	211,277	249,286
Total assets	2,434,353	2,058,885
Current liabilities:
Accounts payable	62,958	61,461
Accrued compensation and related benefits	56,286	88,260
Other accrued liabilities	115,791	113,679
Total current liabilities	235,035	263,400
Income tax liabilities	60,724	53,509
Other long-term liabilities	88,655	73,374
Total liabilities	384,414	390,283
Commitments and contingencies
Stockholders’ equity:
Common stock and additional paid-in capital: $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 48,028 and 47,107, respectively	1,129,937	975,276
Retained earnings	947,064	716,403
Accumulated other comprehensive loss	(27,062)	(23,077)
Total stockholders’ equity	2,049,939	1,668,602
Total liabilities and stockholders’ equity	$ 2,434,353	$ 2,058,885

XML

Consolidated Balance Sheets (Parentheticals) - $ / shares shares in Thousands	Dec. 31, 2023	Dec. 31, 2022
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	150,000	150,000
Common stock, shares issued (in shares)	48,028	47,107
Common stock, shares outstanding (in shares)	48,028	47,107

XML

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue	$ 1,821,072	$ 1,794,148	$ 1,207,798
Cost of revenue	799,953	745,596	522,339
Gross profit	1,021,119	1,048,552	685,459
Operating expenses:
Research and development	263,643	240,171	190,627
Selling, general and administrative	275,740	281,596	232,415
Total operating expenses	539,383	521,767	423,042
Operating income	481,736	526,785	262,417
Other income (expense), net	24,105	(1,848)	9,802
Income before income taxes	505,841	524,937	272,219
Income tax expense	78,467	87,265	30,196
Net income	$ 427,374	$ 437,672	$ 242,023
Net income per share
Basic (in dollars per share)	$ 8.98	$ 9.37	$ 5.28
Diluted (in dollars per share)	$ 8.76	$ 9.05	$ 5.05
Weighted-average shares outstanding:
Basic (in shares)	47,610	46,727	45,851
Diluted (in shares)	48,771	48,358	47,889

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 427,374	$ 437,672	$ 242,023
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(9,528)	(32,293)	8,404
Change in unrealized gains and losses on available-for-sale securities, net of tax of $(1,352), $184 and $613, respectively	5,543	(6,664)	(2,664)
Other comprehensive income (loss), net of tax	(3,985)	(38,957)	5,740
Comprehensive income	$ 423,389	$ 398,715	$ 247,763

XML

Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in unrealized gain (loss) on available-for-sale securities, tax	$ (1,352)	$ 184	$ 613

XML

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2020	45,267,000
Balance at Dec. 31, 2020	$ 657,701	$ 298,746	$ 10,140	$ 966,587
Net income	0	242,023	0	242,023
Other comprehensive income	0	0	5,740	5,740
Dividends and dividend equivalents declared	$ 0	(115,890)	0	(115,890)
Common stock issued under the employee equity incentive plan (in shares)	972,000
Common stock issued under the employee equity incentive plan	$ 17,322	0	0	17,322
Common stock issued under the employee stock purchase plan (in shares)	17,000
Common stock issued under the employee stock purchase plan	$ 4,670	0	0	4,670
Stock-based compensation expense	$ 123,533	0	0	123,533
Balance (in shares) at Dec. 31, 2021	46,256,000
Balance at Dec. 31, 2021	$ 803,226	424,879	15,880	1,243,985
Net income	0	437,672	0	437,672
Other comprehensive income	0	0	(38,957)	(38,957)
Dividends and dividend equivalents declared	$ 0	(146,148)	0	(146,148)
Common stock issued under the employee equity incentive plan (in shares)	837,000
Common stock issued under the employee equity incentive plan	$ 5,358	0	0	5,358
Common stock issued under the employee stock purchase plan (in shares)	14,000
Common stock issued under the employee stock purchase plan	$ 5,877	0	0	5,877
Stock-based compensation expense	$ 160,815	0	0	$ 160,815
Balance (in shares) at Dec. 31, 2022	47,107,000			47,107,000
Balance at Dec. 31, 2022	$ 975,276	716,403	(23,077)	$ 1,668,602
Net income	0	427,374	0	427,374
Other comprehensive income	0	0	(3,985)	(3,985)
Dividends and dividend equivalents declared	$ 0	(196,713)	0	(196,713)
Common stock issued under the employee equity incentive plan (in shares)	911,000
Common stock issued under the employee equity incentive plan	$ 1,118	0	0	1,118
Common stock issued under the employee stock purchase plan (in shares)	17,000
Common stock issued under the employee stock purchase plan	$ 7,568	0	0	7,568
Stock-based compensation expense	$ 149,716	0	0	$ 149,716
Repurchase of common stock (in shares)	(7,000)			(7,000)
Repurchase of common stock	$ (3,741)	0	0	$ (3,741)
Balance (in shares) at Dec. 31, 2023	48,028,000			48,028,000
Balance at Dec. 31, 2023	$ 1,129,937	$ 947,064	$ (27,062)	$ 2,049,939

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Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Dividends and dividend equivalents declared per share (in dollars per share)	$ 1	$ 4	$ 3	$ 2.4

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 427,374	$ 437,672	$ 242,023
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	40,168	37,114	28,699
Amortization of premium (discount) on available-for-sale securities	(5,277)	4,375	4,674
Loss (gain) on deferred compensation plan investments	(8,505)	6,600	(4,563)
Deferred taxes, net	5,865	(13,220)	(2,772)
Gain on sale of equity investment	(1,424)	0	0
Stock-based compensation expense	149,711	160,992	123,479
Other	(23)	97	110
Changes in operating assets and liabilities:
Accounts receivable	2,884	(77,903)	(37,976)
Inventories	63,583	(188,073)	(102,323)
Other assets	(24,310)	(177,284)	(15,311)
Accounts payable	4,797	(11,240)	32,926
Accrued compensation and related benefits	(31,187)	28,514	16,536
Income tax liabilities	(308)	16,559	11,771
Other accrued liabilities	14,865	22,471	22,737
Net cash provided by operating activities	638,213	246,674	320,010
Cash flows from investing activities:
Purchases of property and equipment	(57,578)	(58,843)	(94,420)
Purchases of investments	(582,603)	(65,785)	(394,886)
Maturities and sales of investments	468,308	128,610	113,755
Contributions to deferred compensation plan, net	(6,853)	(16,492)	(2,542)
Purchases of intangible assets	0	0	(793)
Net cash used in investing activities	(178,726)	(12,510)	(378,886)
Cash flows from financing activities:
Property and equipment purchased on extended payment terms	(2,826)	(2,055)	(2,834)
Proceeds from common stock issued under the employee equity incentive plan	1,118	5,358	17,322
Proceeds from common stock issued under the employee stock purchase plan	7,568	5,877	4,670
Repurchase of common stock	(3,741)	0	0
Dividends and dividend equivalents paid	(185,844)	(137,965)	(109,364)
Net cash used in financing activities	(183,725)	(128,785)	(90,206)
Effect of change in exchange rates	(3,310)	(6,039)	3,400
Net increase (decrease) in cash, cash equivalents and restricted cash	272,452	99,340	(145,682)
Cash, cash equivalents and restricted cash, beginning of period	288,729	189,389	335,071
Cash, cash equivalents and restricted cash, end of period	561,181	288,729	189,389
Supplemental disclosures for cash flow information:
Cash paid for income taxes, net	85,128	85,031	21,148
Non-cash investing and financing activities:
Liability accrued for property and equipment purchases	1,784	5,743	17,877
Liability accrued for dividends and dividend equivalents	$ 53,213	$ 40,939	$ 33,059

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Note 1 - Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Significant Accounting Policies [Text Block]

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Business

Monolithic Power Systems, Inc. (the “Company”) was incorporated in the State of California on August 22, 1997. On November 17, 2004, the Company was reincorporated in the State of Delaware. MPS designs, develops and markets high-performance, semiconductor-based power electronic solutions. MPS’s mission is to provide innovative power solutions in the storage and computing, enterprise data, automotive, industrial, communications and consumer markets.

Basis of Presentation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions used in these consolidated financial statements primarily include those related to revenue recognition, inventory valuation, valuation of share-based awards, contingencies and income tax valuation allowances. Actual results could differ from these estimates and assumptions, and any such differences  may be material to the Company’s consolidated financial statements. 

Certain Significant Risks and Uncertainties

Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash equivalents, short-term and long-term investments and accounts receivable. The Company’s cash equivalents include short-term, highly liquid investments purchased with remaining maturities at the date of purchase of three months or less. The Company’s short-term investments may consist of corporate debt securities, certificates of deposit, commercial paper and government agency bonds and treasuries, and the long-term investments consist of government-backed student loan auction-rate securities.

The Company does not require its customers to provide collateral to support accounts receivable. The Company assesses the collectability by reviewing accounts receivable on a customer-by-customer basis. To manage credit risk, management performs ongoing credit evaluations of the customers’ financial condition, monitors payment performance, and assesses current economic conditions, as well as reasonable and supportable forecasts of future economic conditions, that  may affect collectability of the outstanding receivables. For certain high-risk customers, the Company requires standby letters of credit or advance payment prior to shipments of goods.

The Company participates in the dynamic high technology industry and believes that changes in any of the following areas could have a material adverse effect on its future financial position, results of operations or cash flows: advances and trends in new technologies and industry standards; competitive pressures in the form of new products or price reductions on current products; changes in product mix; changes in the overall demand for products offered by the Company or in specific markets; changes in third-party manufacturers or the terms of such arrangements; changes in key suppliers; changes in certain strategic relationships or customer relationships; litigation or claims against the Company based on intellectual property, patent, product, regulatory or other factors; fluctuations in foreign currency exchange rates; risk associated with changes in government policies and regulations on trade restrictions and corporate taxes; availability of necessary components or sub-assemblies; availability of foundry capacity; ability to integrate acquired companies; and the Company’s ability to attract and retain employees necessary to support its growth.

Foreign Currency  

In general, the functional currency of the Company’s international subsidiaries is the local currency. The primary subsidiaries are located in China, Taiwan and Europe, which utilize the Renminbi, the New Taiwan Dollar and the Euro as their currencies, respectively. Accordingly, assets and liabilities of the foreign subsidiaries are translated using exchange rates in effect at the end of the period. Revenue and costs are translated using average exchange rates for the period. The resulting translation adjustments are recorded in accumulated other comprehensive loss on the Consolidated Balance Sheets.

In addition, the Company incurs foreign currency exchange gains or losses related to certain transactions, including intercompany transactions, that are denominated in a currency other than the functional currency. In connection with the remeasurement and settlement of the balances, the Company recorded foreign currency exchange gain (loss) of $(0.2) million, $0.5 million and $(0.7) million for the years ended December 31, 2023, 2022 and 2021, respectively, which were reported in other income (expense), net, on the Consolidated Statements of Operations.

For intercompany transactions that are of a long-term investment nature, the Company records the foreign currency exchange gains and losses in accumulated other comprehensive loss on the Consolidated Balance Sheets.

Cash Equivalents and Debt Investments 

The Company classifies all highly liquid investments with stated maturities of three months or less from date of purchase as cash equivalents. The Company may classify investments with maturities beyond one year as short-term based on the nature of the investments and their availability for use in current operations.

Cash equivalents are stated at cost, which approximates fair market value. The Company’s short-term and long-term debt investments are classified as available-for-sale securities and are stated at their fair market value, with unrealized gains and losses recorded in accumulated other comprehensive loss on the Consolidated Balance Sheets. Premiums and discounts on debt investments are generally amortized or accreted over the life of the related available-for-sale securities. Interest income is recognized when earned. The cost of investments sold is determined on the basis of the specific identification method.

Available-for-sale investments are subject to impairment reviews when the fair value is below the amortized cost basis. If the Company determines that the decline in fair value below the amortized cost basis is due to credit-related factors, the impairment is recognized as an allowance on the Consolidated Balance Sheets with a corresponding adjustment to earnings. An impairment that is not credit-related is recognized in accumulated other comprehensive loss on the Consolidated Balance Sheets. If the Company intends to sell the impaired investments, or more likely than not will be required to sell such investments before recovering the amortized cost basis, the entire impairment amount is recognized in earnings with a corresponding adjustment to the amortized cost basis.

Equity Investments

Equity investments in privately held companies without readily determinable fair values are accounted for under the measurement alternative method, provided that the Company does not have the ability to exercise significant influence or control over the investees. Under this method, the Company measures the investments at cost, less any impairment, and adjusts the carrying value of the investments to fair value resulting from observable transactions for identical or similar investments of the same issuer. The Company records the investments in other long-term assets on the Consolidated Balance Sheets, and gains and losses on the investments are recognized in other income (expense), net, on the Consolidated Statements of Operations.

The Company monitors its non-marketable equity investments for impairment indicators, such as negative changes in industry and market conditions, financial performance, business prospects, and other relevant events and factors. If indicators exist for a security and the fair value is below the carrying amount, the Company writes down the security to fair value.

Fair Value of Financial Instruments

Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value, the Company considers the principal or most advantageous market in which the Company would transact, as well as assumptions that market participants would use when pricing the assets or liabilities. Fair value is estimated by applying the fair value hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement. See Note 4 for additional information on the fair value of the Company’s financial instruments.

Inventories

Inventories are stated at the lower of standard cost (which approximates actual cost determined on a first-in first-out basis) and estimated net realizable value. The Company writes down excess and obsolete inventories based on their age and forecasted demand, which includes estimates taking into consideration the Company’s revenue forecast, outlook on market and economic conditions, technology changes, new product introductions and changes in strategic direction. Actual demand may differ from forecasted demand, and such a difference  may have a material effect on recorded inventory values. When the Company records a write-down on inventory, it establishes a new, lower cost basis for that inventory, and subsequent changes in facts and circumstances will not result in the restoration or increase in that newly established cost basis.

Property and Equipment

Property and equipment are stated at cost. Depreciation commences when an asset is placed in service and available for its intended use. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Buildings and building improvements have estimated useful lives of 20 to 40 years. Leasehold improvements are amortized over the shorter of the estimated useful lives or the lease period. Production equipment, lab equipment and software have estimated useful lives of three to eight years. Transportation equipment has estimated useful lives of 5 to 20 years. Furniture and fixtures have estimated useful lives of three to five years. Land is not depreciated.

Impairment of Long-Lived Assets

The Company evaluates its long-lived assets other than goodwill for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss would be recognized when the sum of the undiscounted future net cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount. Such impairment loss would be measured as the difference between the carrying amount of the asset and its fair value based on the present value of estimated future cash flows. The Company did not record material impairments in any of the periods presented.

Goodwill

Goodwill represents the excess of the fair value of purchase consideration over the fair value of net tangible and identified intangible assets as of the date of acquisition. Goodwill is not amortized.

The Company tests goodwill for impairment at least annually in the fourth quarter of each year, or whenever events or changes in circumstances indicate that goodwill may be impaired. The Company has elected to first assess the qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines that it is more likely than not that the fair value of the reporting unit is less than the carrying amount, then a quantitative goodwill impairment test is performed to measure the impairment loss. No impairment of goodwill has been identified in any of the periods presented.  

Deferred Compensation Plan 

The Company has a non-qualified, unfunded deferred compensation plan, which provides certain key employees, including executive officers, with the ability to defer the receipt of compensation in order to accumulate funds for retirement on a tax deferred basis. The Company does not make contributions to the plan or guarantee returns on the investments. The Company is responsible for the plan’s administrative expenses. Participants’ deferrals and investment gains and losses remain as the Company’s liabilities and the underlying assets are subject to claims of general creditors.

The liabilities for compensation deferred under the plan are recorded at fair value as of the end of each reporting period. Changes in the fair value of the liabilities are included in operating expenses on the Consolidated Statements of Operations. The Company manages the risk of changes in the fair value of the liabilities by electing to match the liabilities with investments in corporate-owned life insurance policies, mutual funds and money market funds that offset a substantial portion of the exposure. The investments are recorded at the cash surrender value of the corporate-owned life insurance policies, and at the fair value of the mutual funds and money market funds, which are classified as trading securities. Changes in the cash surrender value of the corporate-owned life insurance policies and the fair value of mutual fund and money market fund investments are included in other income (expense), net, on the Consolidated Statements of Operations. The following table summarizes the deferred compensation plan balances on the Consolidated Balance Sheets (in thousands): 

	December 31,
	2023		2022
Deferred compensation plan asset components:
Cash surrender value of corporate-owned life insurance policies	$	23,545	$	19,089
Fair value of mutual funds and money market funds		54,836		43,933
Total	$	78,381	$	63,022
Deferred compensation plan assets reported in:
Other long-term assets	$	78,381	$	63,022
Deferred compensation plan liabilities reported in:
Accrued compensation and related benefits (short-term)	$	384	$	118
Other long-term liabilities		80,903		64,863
Total	$	81,287	$	64,981

Revenue Recognition

The Company recognizes revenue when it transfers control of promised goods or services to its customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. See Note 2 for further discussion.

R&D

Costs incurred in R&D are expensed as incurred.

Warranty Reserve

The Company generally provides either a one- or two-year warranty against defects in materials and workmanship and will repair the products, provide replacements at no charge to customers or issue a refund. As they are considered assurance-type warranties, the Company does not account for them as separate performance obligations. Warranty reserve requirements are generally based on a specific assessment of the products sold with warranties when a customer asserts a claim for warranty or a product defect. 

Leases

The Company determines if an arrangement is a lease at inception. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Operating lease right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term, and operating lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of remaining lease payments over the lease term. ROU assets also include any initial direct costs incurred and prepaid lease payments, less lease incentives received. Because the implicit rate in each lease is not readily determinable, the Company uses its estimated incremental borrowing rate to determine the present value of the remaining lease payment. The Company recognizes operating lease costs on a straight-line basis over the lease term.

The Company does not record short-term leases with a term of 12 months or less at the commencement date on the Consolidated Balance Sheets. For lease arrangements that contain lease and non-lease components, the Company accounts for them as single lease components.

For lease arrangements where the Company is the lessor, the Company recognizes lease income from operating leases on a straight-line basis over the lease term.

Stock-Based Compensation

The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The fair value of RSUs with only service conditions is determined based on the grant date stock price. The fair value of all other awards is determined based on the following valuation methods:

Type of Awards	Valuation Method
RSUs with performance conditions (“PSUs”) that have a purchase price adjustment	Monte Carlo simulation model
RSUs with market conditions (“MSUs”)	Monte Carlo simulation model
RSUs with both performance and market conditions (“MPSUs”)	Monte Carlo simulation model
Shares issued under the employee stock purchase plan (“ESPP”)	Black-Scholes model

The valuation models consider inputs including stock price, expected volatility, expected term of awards, risk-free interest rate, and expected dividend yield. Expected volatility used in the models is determined based on historical volatility of the Company’s stock price for the period, which corresponds to the expected term of the awards, immediately preceding the granting of the awards.

Compensation expense related to awards with service conditions is recorded on a straight-line basis over the requisite service period. Compensation expense related to awards subject to performance or market conditions is recognized over the requisite service period for each separately vesting tranche. For awards with only market conditions, compensation expense is not reversed if the market conditions are not satisfied. For awards with only performance conditions, as well as awards containing both market and performance conditions, the Company recognizes compensation expense when it becomes probable that the performance goals will be achieved. Management performs the probability assessment on a quarterly basis by reviewing external factors, such as macroeconomic conditions and the analog industry revenue forecasts, and internal factors, such as the Company’s business and operational objectives and revenue forecasts. Changes in the probability assessment of achievement of the performance conditions are accounted for in the period of change by recording a cumulative catch-up adjustment as if the new estimate had been applied since the service inception date. Any previously recognized compensation expense is reversed if the performance conditions are not expected to be satisfied as a result of management’s assessment.

The Company accounts for forfeitures of equity awards when they occur.

Accounting for Income Taxes 

The Company recognizes federal, state and foreign current tax liabilities or assets based on its estimate of taxes payable or refundable in the current fiscal year by tax jurisdiction. The Company also recognizes federal, state and foreign deferred tax assets or liabilities for its estimate of future tax effects attributable to temporary differences and carryforwards. The Company records a valuation allowance to reduce any deferred tax assets by the amount of any tax benefits that, based on available evidence and judgment, are not expected to be realized.

The Company’s calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments and involves dealing with uncertainties in the application of complex tax laws. The Company’s estimates of current and deferred tax assets and liabilities may change based on, in part, added certainty, finality or uncertainty to an anticipated outcome, changes in accounting or tax laws in the U.S. or foreign jurisdictions where the Company operates, or changes in other facts or circumstances. In addition, the Company recognizes liabilities for potential U.S. and foreign income tax for uncertain income tax positions taken on its tax returns if it has less than a 50% likelihood of being sustained. If the Company determines that payment of these amounts is unnecessary or if the recorded tax liability is less than its current assessment, the Company may be required to recognize an income tax benefit or additional income tax expense in its financial statements in the period such determination is made. The Company has calculated its uncertain tax positions which were attributable to certain estimates and judgments.

Litigation and Contingencies

The Company is a party to actions and proceedings in the ordinary course of business, including challenges to the enforceability or validity of its intellectual property, claims that the Company’s products infringe on the intellectual property rights of others, and employment matters. The Company may also be subject to litigation initiated by its stockholders. The pending proceedings involve complex questions of fact and law and will require the expenditure of significant funds and the diversion of other resources to prosecute and defend. In addition, from time to time, the Company becomes aware that it is subject to other contingent liabilities. When this occurs, the Company will evaluate the appropriate accounting for the potential contingent liabilities to determine whether a contingent liability should be recorded. In making this determination, management may, depending on the nature of the matter, consult with internal and external legal counsel and technical experts. Based on the facts and circumstances in each matter, the Company uses its judgment to determine whether it is probable that a contingent loss has occurred and whether the amount of such loss can be estimated. If the Company determines a loss is probable and estimable, the Company records a contingent loss. In determining the amount of a contingent loss, the Company takes into account advice received from experts for each specific matter regarding the status of legal proceedings, settlement negotiations, prior case history and other factors. Should the judgments and estimates made by management need to be adjusted as additional information becomes available, the Company may need to record additional contingent losses. Alternatively, if the judgments and estimates made by management are adjusted, for example, if a particular contingent loss does not occur, the contingent loss recorded would be reversed.

Net Income per Share

Basic net income per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into shares of common stock, and calculated using the treasury stock method. Contingently issuable shares, including equity awards with performance conditions or market conditions, are considered outstanding shares of common stock and included in the basic net income per share as of the date that all necessary conditions to earn the awards have been satisfied. Prior to the end of the contingency period, the number of contingently issuable shares included in the diluted net income per share is based on the number of shares, if any, that would be issuable under the terms of the arrangement at the end of the reporting period.

The Company’s RSUs contain forfeitable rights to receive cash dividend equivalents, which are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do not fulfill the requisite service requirement and, as a result, the awards do not vest. Accordingly, these awards are not treated as participating securities in the net income per share calculation. 

Comprehensive Income 

Comprehensive income represents the change in the Company’s net assets during the period from non-owner sources. Accumulated other comprehensive loss presented on the Consolidated Balance Sheets primarily consists of unrealized gains or losses related to available-for-sale investments and foreign currency translation adjustments.

Recently Adopted Accounting Pronouncement

In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. The guidance requires an acquirer to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Accounting Standards Codification 606, Revenue from Contracts with Customers, as if it had originated the contracts. The Company adopted this guidance at the beginning of fiscal year 2023 prospectively and it did not impact the consolidated financial statements for the year ended December 31, 2023. The Company is evaluating the impact of this guidance on its recent acquisition but does not expect a material impact on its consolidated financial statements. See Note 17 for additional information regarding this acquisition.

New Accounting Pronouncements Not Yet Adopted as of December 31, 2023

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which aims to improve disclosures regarding a public entity’s reportable segments, primarily through more comprehensive disclosures around significant segment expenses. The guidance will be effective for the annual reporting for fiscal year 2024 and interim reporting for the first quarter in 2025, and should be applied retroactively to all prior periods presented. The Company is evaluating the impact of adoption on its consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which aims to improve an entity’s income tax disclosures around its effective rate reconciliation, income taxes paid, disaggregation of income before income taxes and income tax expense. The guidance will be effective for annual reporting for fiscal year 2025. The standard should be applied prospectively and retrospective application is permitted. The Company does not expect the adoption of this standard to have a material impact on its consolidated financial statements.

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Note 2 - Revenue Recognition

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Revenue from Contract with Customer [Text Block]

2.  REVENUE RECOGNITION

Revenue from Product Sales

The Company generates revenue primarily from product sales, which include assembled and tested ICs, as well as dies in wafer form. These product sales accounted for 99%, 98% and 97% of the Company’s total revenue for the years ended December 31, 2023, 2022 and 2021, respectively. The remaining revenue primarily includes royalty revenue from licensing arrangements and revenue from wafer testing services performed for third parties, which have not been significant for the periods presented. See Note 15 for the disaggregation of the Company’s revenue by geographic region and by product family.

The Company sells its products primarily through third-party distributors, value-added resellers, OEMs, ODMs and EMS providers. For the years ended December 31, 2023, 2022 and 2021, 80%, 83% and 88%, respectively, of the Company’s product sales were made through distribution arrangements. These distribution arrangements contain enforceable rights and obligations specific to those distributors and not the end customers. Purchase orders, which are generally governed by sales agreements or the Company’s standard terms of sale, set the final terms for unit price, quantity, shipping and payment agreed between the Company and the customer. The Company considers purchase orders to be the contracts with customers. The unit price as stated on the purchase orders is considered the observable, stand-alone selling price for the arrangements.

The Company recognizes revenue when it satisfies a performance obligation by transferring control of the promised goods or services to its customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The Company excludes taxes assessed by government authorities, such as sales taxes, from revenue.

Product sales consist of a single performance obligation that the Company satisfies at a point in time. The Company recognizes product revenue from distributors and direct end customers when the following events have occurred: (a) the Company has transferred physical possession of the products, (b) the Company has a present right to payment, (c) the customer has legal title to the products, and (d) the customer bears significant risks and rewards of ownership of the products. In accordance with the shipping terms specified in the contracts, these criteria are generally met when the products are shipped from the Company’s facilities (such as the “Ex Works” shipping term) or delivered to the customers’ locations (such as the “Delivered Duty Paid” shipping term).

Under certain consignment agreements, revenue is not recognized when the products are shipped and delivered to be held at customers’ designated locations because the Company continues to control the products and retain ownership, and the customers do not have an unconditional obligation to pay. The Company recognizes revenue when the customers consume the products from the consigned inventory locations or at which time control transfers to the customers and the Company invoices them for payment.

Variable Consideration

The Company accounts for price adjustments and stock rotation rights as variable consideration that reduces the transaction price and recognizes that reduction in the same period the associated revenue is recognized. Certain U.S.-based distributors have price adjustment rights when they sell the Company’s products to their end customers at a price that is lower than the distribution price invoiced by the Company. When the Company receives claims from the distributors that products have been sold to the end customers at the lower prices, the Company issues the distributors credit memos for the price adjustments. The Company estimates the price adjustments using the expected value method based on an analysis of historical claims, at both the distributor and product level, as well as an assessment of any known trends of product sales mix. Other U.S. distributors and non-U.S. distributors do not have price adjustment rights. The Company records a credit against accounts receivable for the estimated price adjustments, with a corresponding reduction to revenue.

Certain distributors have limited stock rotation rights that permit the return of a small percentage of the previous six months’ purchases in accordance with the contract terms. The Company estimates the stock rotation returns using the expected value method based on an analysis of historical returns, and the current level of inventory in the distribution channel. The Company records a liability for the stock rotation reserve, with a corresponding reduction to revenue. In addition, the Company recognizes an asset for product returns which represents the right to recover products from the customers related to stock rotations, with a corresponding reduction to cost of revenue.

Contract Balances

Accounts Receivable:

The Company records a receivable when it has an unconditional right to receive consideration after the performance obligations are satisfied. As of  December 31, 2023 and 2022, accounts receivable totaled $179.9 million and $182.7 million, respectively. The Company’s accounts receivable are short-term, with standard payment terms generally ranging from 30 to 90 days. The Company did not recognize any write-offs of accounts receivable or record any allowance for credit losses for the periods presented. 

Contract Liabilities:

For certain customers located in Asia, the Company requires cash payments two weeks before the products are scheduled to be shipped to the customers. The Company records these payments received in advance of performance as customer prepayments within current accrued liabilities. As of December 31, 2023 and 2022, customer prepayments totaled $2.8 million and $3.6 million, respectively. The decrease in the customer prepayment balance for the year ended December 31, 2023 resulted from a decrease in unfulfilled customer orders for which the Company had received payments. For the year ended December 31, 2023, the Company recognized substantially all of the revenue that was included in the customer prepayment balance as of December 31, 2022.

Practical Expedients

The Company has elected the practical expedient to expense sales commissions as incurred because the amortization period would have been one year or less. 

The Company’s standard payment terms generally require customers to pay 30 to 90 days after the Company satisfies the performance obligations. For those customers who are required to pay in advance, the Company satisfies the performance obligations generally within a quarter. For these reasons, the Company has elected not to determine whether contracts with customers contain significant financing components.

The Company’s unsatisfied performance obligations primarily include products held in consignment arrangements and customer purchase orders for products that the Company has not yet shipped. Because the Company expects to fulfill these performance obligations within one year, the Company has elected not to disclose the amount of these remaining performance obligations.

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Note 3 - Cash, Cash Equivalents, Investments and Restricted Cash

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Financial Instruments Disclosure [Text Block]

3.  CASH, CASH EQUIVALENTS, INVESTMENTS AND RESTRICTED CASH

The following is a summary of the Company’s cash, cash equivalents and debt investments (in thousands): 

	December 31,
	2023		2022
Cash	$	392,329	$	273,145
Money market funds		135,514		15,462
Certificates of deposit		127,123		130,467
Corporate debt securities		95,101		292,586
Commercial paper		-		17,928
U.S. treasuries and government agency bonds		358,409		8,285
Auction-rate securities backed by student-loan notes		567		1,711
Total	$	1,109,043	$	739,584

	December 31,
	2023		2022
Reported as:
Cash and cash equivalents	$	527,843	$	288,607
Short-term investments		580,633		449,266
Investment within other long-term assets		567		1,711
Total	$	1,109,043	$	739,584

The following table summarizes the contractual maturities of the short-term and long-term available-for-sale investments as of December 31, 2023 (in thousands): 

	Amortized Cost		Fair Value
Due in less than 1 year	$	398,670	$	397,884
Due in 1 - 5 years		183,266		182,749
Due in greater than 5 years		574		567
Total	$	582,510	$	581,200

Gross realized gains and losses were not material for the periods presented.

The following tables summarize the unrealized gain and loss positions related to the available-for sale investments (in thousands): 

	December 31, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Money market funds	$	135,514	$	-	$	-		$	135,514
Certificates of deposit		127,123		-		-			127,123
Corporate debt securities		96,636		4		(1,539	)		95,101
U.S. treasuries and government agency bonds		358,177		327		(95	)		358,409
Auction-rate securities backed by student-loan notes		574		-		(7	)		567
Total	$	718,024	$	331	$	(1,641	)	$	716,714

	December 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Money market funds	$	15,462	$	-	$	-		$	15,462
Certificates of deposit		130,467		-		-			130,467
Corporate debt securities		300,529		18		(7,961	)		292,586
Commercial paper		17,928		-		-			17,928
U.S. treasuries and government agency bonds		8,487		-		(202	)		8,285
Auction-rate securities backed by student-loan notes		1,770		-		(59	)		1,711
Total	$	474,643	$	18	$	(8,222	)	$	466,439

The following tables present information about the available-for-sale investments that had been in a continuous unrealized loss position for less than 12 months and for greater than 12 months (in thousands):

	December 31, 2023
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	20,792	$	(19	)	$	70,806	$	(1,520	)	$	91,598	$	(1,539	)
U.S. treasuries and government agency bonds		97,599		(95	)		-		-			97,599		(95	)
Auction-rate securities backed by student-loan notes		-		-			567		(7	)		567		(7	)
Total	$	118,391	$	(114	)	$	71,373	$	(1,527	)	$	189,764	$	(1,641	)

	December 31, 2022
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	72,943	$	(973	)	$	202,074	$	(6,988	)	$	275,017	$	(7,961	)
U.S. treasuries and government agency bonds		987		(2	)		7,298		(200	)		8,285		(202	)
Auction-rate securities backed by student-loan notes		-		-			1,711		(59	)		1,711		(59	)
Total	$	73,930	$	(975	)	$	211,083	$	(7,247	)	$	285,013	$	(8,222	)

An impairment exists when the fair value of an investment is less than its amortized cost basis. As of December 31, 2023 and 2022, the Company did not consider the impairment of its investments to be a result of credit losses. The Company typically invests in highly rated securities, with the primary objective of minimizing the potential risk of principal loss. The Company’s investment policy generally requires securities to be investment grade and limits the amount of credit exposure to any one issuer. When evaluating a debt security for impairment, management reviews factors such as the Company’s intent to sell, or whether it will more likely than not be required to sell, the security before recovery of its amortized cost basis, the extent to which the fair value of the security is less than its cost, the financial condition of the issuer and the credit quality of the investment.

Non-Marketable Equity Investment

In November 2020, the Company made an equity investment in a privately held Swiss company (the “Investee”) that is accounted for under the measurement alternative. In April 2022, the Company made an additional investment in the form of a convertible loan. One member of the Board of Directors was an executive officer of a company that has a commercial relationship with the Investee. In addition, the Company’s Chief Executive Officer had a personal investment in the Investee and was on the Investee’s Board of Directors. As of December 31, 2022, the Company’s investment in the Investee, which is denominated in Swiss Franc, had a carrying value of $5.4 million.

In May 2023, the Company sold all its investments in the Investee for $7.4 million and recorded a gain of $1.4 million, which was included as a component of other income (expense), net, in the Consolidated Statements of Operations for the year ended December 31, 2023.

Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported on the Consolidated Balance Sheets to the amounts reported on the Consolidated Statements of Cash Flows (in thousands):   

	December 31,
	2023		2022
Cash and cash equivalents	$	527,843	$	288,607
Restricted cash included in other current assets		33,204		-
Restricted cash included in other long-term assets		134		122
Total cash, cash equivalents and restricted cash reported on the Consolidated Statements of Cash Flows	$	561,181	$	288,729

As of December 31, 2023, restricted cash included in other current assets was related to preliminary purchase consideration held in a trust account in connection with the Company’s recent acquisition. See Note 17 for additional information. As of December 31, 2023 and 2022, restricted cash included in other long-term assets was related to a security deposit that is set aside in a bank account and cannot be withdrawn by the Company under the terms of a lease agreement. The restriction will end upon the expiration of the lease.

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Note 4 - Fair Value Measurements

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Fair Value Disclosures [Text Block]

4. FAIR VALUE MEASUREMENTS

Fair Value Hierarchy

The Company has estimated the fair value of its financial assets by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

● Level 1 —includes instruments with quoted prices in active markets for identical assets.

● Level 2 —includes instruments for which the valuations are based upon quoted market prices in active markets involving similar assets or inputs other than quoted prices that are observable for the assets. The market inputs used to value these instruments generally consist of market yields, recently executed transactions, broker/dealer quotes or alternative pricing sources with reasonable levels of price transparency. Pricing sources may include industry standard data providers, security master files from large financial institutions, and other third-party sources used to determine a daily market value.

● Level 3 —includes instruments for which the valuations are based on inputs that are unobservable and significant to the overall fair value measurement.

Financial Assets Measured at Fair Value on a Recurring Basis

The following table details the fair value of the financial assets measured on a recurring basis (in thousands):

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Money market funds	$	135,514	$	135,514	$	-	$	-
Certificates of deposit		127,123		-		127,123		-
Corporate debt securities		95,101		-		95,101		-
U.S. treasuries and government agency bonds		358,409		-		358,409		-
Auction-rate securities backed by student-loan notes		567		-		-		567
Mutual funds and money market funds under deferred compensation plan		54,836		54,836		-		-
Total	$	771,550	$	190,350	$	580,633	$	567

	December 31, 2022
	Total		Level 1		Level 2		Level 3
Money market funds	$	15,462	$	15,462	$	-	$	-
Certificates of deposit		130,467		-		130,467		-
Corporate debt securities		292,586		-		292,586		-
Commercial paper		17,928		-		17,928		-
U.S. treasuries and government agency bonds		8,285		-		8,285		-
Auction-rate securities backed by student-loan notes		1,711		-		-		1,711
Mutual funds and money market funds under deferred compensation plan		43,933		43,933		-		-
Total	$	510,372	$	59,395	$	449,266	$	1,711

Redemptions and changes in the fair value of the auction-rate securities classified as Level 3 assets were not material for the periods presented.

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Note 5 - Balance Sheet Components

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Supplemental Balance Sheet Disclosures [Text Block]

5. BALANCE SHEET COMPONENTS

Inventories 

Inventories consist of the following (in thousands):

	December 31,
	2023		2022
Raw materials	$	118,917	$	126,760
Work in process		112,750		134,071
Finished goods		152,035		186,459
Total	$	383,702	$	447,290

Other Current Assets

Other current assets consist of the following (in thousands):

	December 31,
	2023		2022
Other receivables	$	50,000	$	-
RSU tax withholding proceeds receivable		20,141		14,480
Prepaid expenses		28,964		11,045
Restricted cash		33,204		-
Other		15,154		17,217
Total	$	147,463	$	42,742

Other receivables relate to a deposit made to a supplier under a long-term wafer supply agreement. See Note 12 for further details. 

Property and Equipment, Net

Property and equipment, net, consist of the following (in thousands):

	December 31,
	2023			2022
Land	$	48,490		$	41,924
Production equipment and software		270,390			254,882
Buildings and improvements		205,132			195,205
Transportation equipment		28,641			28,612
Leasehold improvements		17,052			17,389
Furniture and fixtures		11,711			11,378
Construction in progress		16,980			1,908
Property and equipment, gross		598,396			551,298
Less: accumulated depreciation and amortization		(229,444	)		(194,141	)
Total	$	368,952		$	357,157

Depreciation and amortization expense on property and equipment was $40.0 million, $36.8 million and $28.4 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Other Long-Term Assets

Other long-term assets consist of the following (in thousands):

	December 31,
	2023		2022
Deferred compensation plan assets	$	78,381	$	63,022
Prepaid wafer purchases		120,000		170,000
Other		12,896		16,264
Total	$	211,277	$	249,286

Prepaid wafer purchases relate to a deposit made to a supplier under a long-term wafer supply agreement. See Note 12 for further details.

Other Accrued Liabilities

Other accrued liabilities consist of the following (in thousands):

	December 31,
	2023		2022
Dividends and dividend equivalents	$	57,697	$	42,170
Warranty		16,906		24,082
Stock rotation and sales returns		18,843		14,931
Income tax payable		8,063		15,595
Other		14,282		16,901
Total	$	115,791	$	113,679

Other Long-Term Liabilities

Other long-term liabilities consist of the following (in thousands):

	December 31,
	2023		2022
Deferred compensation plan liabilities	$	80,903	$	64,863
Dividend equivalents		2,187		6,847
Operating lease liabilities		5,565		1,664
Total	$	88,655	$	73,374

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Note 6 - Leases

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Leases Disclosure [Text Block]

6. LEASES

Lessee

The Company has operating leases primarily for administrative, sales and marketing offices, manufacturing operations and R&D facilities, employee housing units and certain equipment. These leases have remaining lease terms from less than one year to seven years. Some of these leases include options to renew the lease term for up to five years or on a month-to-month basis. The Company does not have finance lease arrangements.

The following table summarizes the balances of operating lease ROU assets and liabilities (in thousands):

		December 31,
	Financial Statement Line Item	2023		2022
Operating lease ROU assets	Other long-term assets	$	8,355	$	4,288
Operating lease liabilities	Other accrued liabilities	$	2,303	$	2,133
	Other long-term liabilities	$	5,565	$	1,664

The following tables summarize certain information related to the leases (in thousands, except percentages and years):

	Year Ended December 31,
	2023		2022		2021
Lease costs:
Operating lease costs	$	3,113	$	2,704	$	2,454
Other		2,120		1,769		740
Total lease costs	$	5,233	$	4,473	$	3,194

	Year Ended December 31,
	2023		2022		2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	2,954	$	2,762	$	2,315
ROU assets obtained in exchange for new operating lease liabilities	$	7,081	$	1,175	$	5,195

	December 31,
	2023			2022
Weighted-average remaining lease term (in years)		4.7			2.1
Weighted-average discount rate		4.3	%		2.1	%

As of  December 31, 2023, the maturities of the lease liabilities were as follows (in thousands):

2024	$	2,583
2025		1,909
2026		1,230
2027		1,238
Thereafter		1,653
Total remaining lease payments		8,613
Less: imputed interest		(745	)
Total lease liabilities	$	7,868

As of  December 31, 2023, the operating lease that has not yet commenced is not material.

Lessor

The Company owns certain office buildings and leases a portion of these properties to third parties under arrangements that are classified as operating leases. These leases have remaining lease terms ranging from less than one year to three years. Some of these leases include options to renew the lease term for up to five years.

Income related to lease payments was $1.5 million, $2.4 million and $2.2 million for the years ended December 31, 2023, 2022 and 2021, respectively. As of December 31, 2023, future income related to lease payments was as follows (in thousands):

2024	$	760
2025		235
2026		41
Total	$	1,036

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Note 7 - Stock-based Compensation

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Share-Based Payment Arrangement [Text Block]

7. STOCK-BASED COMPENSATION

2014 Equity Incentive Plan 

In  April 2013, the Board of Directors adopted the 2014 Equity Incentive Plan (the “2014 Plan”), which the Company’s stockholders approved in  June 2013. In  October 2014, the Board of Directors approved certain amendments to the 2014 Plan. The amended 2014 Plan became effective on  November 13, 2014 and provided for the issuance of up to 5.5 million shares. In  April 2020, the Board of Directors further amended and restated the amended 2014 Plan (the “Amended and Restated 2014 Plan”), which the Company’s stockholders approved in  June 2020. The Amended and Restated 2014 Plan became effective on  June 11, 2020 and provides for the issuance of up to 10.5 million shares. The Amended and Restated 2014 Plan will expire on  June 11, 2030. As of  December 31, 2023, 4.2 million shares remained available for future issuance under the Amended and Restated 2014 Plan.  

Stock-Based Compensation Expense

The Company recognized stock-based compensation expense as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Cost of revenue	$	4,545	$	4,721	$	3,543
Research and development		36,611		35,355		26,030
Selling, general and administrative		108,555		120,916		93,906
Total stock-based compensation expense	$	149,711	$	160,992	$	123,479
Tax benefit related to stock-based compensation (1)	$	2,519	$	2,498	$	1,760

(1) Amount reflects the tax benefit related to stock-based compensation recorded for equity awards that are expected to generate tax deductions when they vest in future periods. Equity awards granted to the Company’s executive officers are subject to the tax deduction limitations set by Section 162(m) of the IRC.

RSUs

The Company’s RSUs include time-based RSUs, PSUs, MSUs, and MPSUs. Vesting of awards with performance conditions or market conditions is subject to the achievement of pre-determined performance or market goals and the approval of such achievement by the Compensation Committee of the Board of Directors (the “Compensation Committee”). All awards include service conditions which require continued employment with the Company.

A summary of RSU activity is presented in the table below (in thousands, except per share amounts):

	Time-Based RSUs					PSUs and MPSUs						MSUs					Total
	Number of Shares			Weighted-Average Grant Date Fair Value Per Share		Number of Shares				Weighted-Average Grant Date Fair Value Per Share		Number of Shares			Weighted-Average Grant Date Fair Value Per Share		Number of Shares			Weighted-Average Grant Date Fair Value Per Share
Outstanding at January 1, 2021		161		$	151.62		1,390			$	132.60		1,554		$	40.40		3,105		$	87.42
Granted		46		$	384.33		365		(1)	$	354.12		-		$	-		411		$	357.49
Vested		(71	)	$	144.46		(577	)		$	91.50		(324	)	$	23.57		(972	)	$	72.69
Forfeited		(11	)	$	207.04		(12	)		$	103.84		(12	)	$	68.48		(35	)	$	124.50
Outstanding at December 31, 2021		125		$	235.82		1,166			$	222.78		1,218		$	44.59		2,509		$	136.87
Granted		49		$	390.89		35		(1)(2)	$	385.80		917		$	199.63		1,001		$	215.63
Vested		(61	)	$	193.18		(452	)		$	147.78		(324	)	$	23.57		(837	)	$	103.02
Forfeited		(7	)	$	316.00		(1	)		$	377.86		(6	)	$	216.37		(14	)	$	275.47
Outstanding at December 31, 2022		106		$	327.13		748			$	275.70		1,805		$	126.57		2,659		$	176.50
Granted		51		$	472.38		281		(1)	$	449.38		31		$	330.95		363		$	444.86
Vested		(49	)	$	296.65		(543	)		$	257.24		(319	)	$	23.57		(911	)	$	177.54
Forfeited		(6	)	$	387.61		(4	)		$	315.19		(15	)	$	110.65		(25	)	$	209.23
Outstanding at December 31, 2023		102		$	411.11		482			$	397.77		1,502		$	152.89		2,086		$	222.04

(1) Amount reflects the number of awards that  may ultimately be earned based on management’s probability assessment of the achievement of performance conditions at each reporting period.

(2) Amount included grants and cancellations of the 2022 Executive PSUs as defined under the “2022 PSUs” section.

The intrinsic value related to vested RSUs was $461.3 million, $336.8 million and $381.2 million for the years ended December 31, 2023, 2022 and 2021, respectively. As of December 31, 2023, the total intrinsic value of all outstanding RSUs was $1.3 billion, based on the closing stock price of $630.78. As of December 31, 2023, unamortized compensation expense related to all outstanding RSUs was $232.6 million with a weighted-average remaining recognition period of approximately two years. 

Cash proceeds from vested PSUs with a purchase price totaled $1.1 million, $5.4 million and $17.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Time-Based RSUs

For the years ended December 31, 2023, 2022 and 2021, the Compensation Committee granted 51,000, 49,000 and 46,000 RSUs, respectively, with service conditions to non-executive employees and non-employee directors. The RSUs generally vest over four years for employees and one year for directors, subject to continued service with the Company.

PSUs and MPSUs

2023 PSUs:

In February 2023, the Compensation Committee granted 69,000 PSUs to the executive officers, which represent a target number of shares that can be earned based on the degree of achievement of two sets of performance goals (“2023 Executive PSUs”). For the first goal, the executive officers can earn up to 300% of the target number of the 2023 Executive PSUs based on the achievement of the Company’s average three-year (2023 through 2025) revenue growth rate in excess of the analog industry’s average three-year revenue growth rate as published by the Semiconductor Industry Association (the “SIA”). For the second goal, the executive officers can earn up to an additional 200% of the target number of the 2023 Executive PSUs if the Company secures additional manufacturing capacity outside China during a three-year performance period. For both goals, a percentage of the 2023 Executive PSUs will fully vest on December 31, 2025, depending on the degree to which the pre-determined goals are met during the performance periods. Assuming the achievement of the highest level of the performance goals, the total stock-based compensation cost for the 2023 Executive PSUs is $156.2 million.

In February 2023, the Compensation Committee granted 13,000 PSUs to certain non-executive employees, which represent a target number of shares that can be earned based on the degree of achievement of the Company’s 2024 revenue goals for certain regions or product line divisions, or based on the degree of achievement of the Company’s average two-year (2023 and 2024) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2023 Non-Executive PSUs”). The maximum number of shares that an employee can earn is either 200% or 300% of the target number of the 2023 Non-Executive PSUs, depending on the job classification of the employee. 50% of the 2023 Non-Executive PSUs will vest in the first quarter of 2025 depending on the degree to which the pre-determined goals are met during the performance period. The remaining 2023 Non-Executive PSUs will vest over the following two years on a quarterly basis. Assuming the achievement of the highest level of performance goals, the total stock-based compensation cost for the 2023 Non-Executive PSUs is $13.8 million.

The 2023 Executive PSUs and the 2023 Non-Executive PSUs contain a purchase price feature, which requires the employees to pay the Company $30 per share upon vesting of the shares. The $30 purchase price requirement is deemed satisfied and waived if the Company’s stock price on the last trading day of the performance period is $30 higher than the grant date stock price of $467.62. The Company determined the grant date fair value of the 2023 Executive PSUs and the 2023 Non-Executive PSUs using a Monte Carlo simulation model with the following assumptions: stock price of $467.62, simulation term of four years, expected volatility of 51.0%, risk-free interest rate of 3.9%, and expected dividend yield of 0.9%. There is no illiquidity discount because the awards do not contain any post-vesting sales restrictions.

2022 PSUs:

In February 2022, the Compensation Committee granted 81,000 PSUs to the executive officers, which represented a target number of shares that could be earned subject to the achievement of two sets of performance goals (“2022 Executive PSUs”). For the first goal, the executive officers could earn up to 300% of the target number of the 2022 Executive PSUs based on the achievement of the Company’s average two-year (2022 and 2023) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA. 50% of the 2022 Executive PSUs would vest in the first quarter of 2024 if the pre-determined revenue goal was met during the performance period. The remaining 2022 Executive PSUs would vest over the following two years on a quarterly basis. For the second goal, the executive officers could earn up to an additional 200% of the target number of the 2022 Executive PSUs if the Company secured additional wafer capacity during a three-year performance period. The 2022 Executive PSUs related to the second goal would fully vest in the first quarter of 2025 if the pre-determined goal was met during the performance period. In addition, all vested shares related to the second goal would be subject to a post-vesting sales restriction period of one year. Assuming the achievement of the highest level of the performance goals, the total stock-based compensation cost for the 2022 Executive PSUs would be $142.7 million. The 2022 Executive PSUs were subsequently cancelled by the Board of Directors in October 2022. See the “2022 MSUs” section for further details.

In February 2022, the Compensation Committee granted 14,000 PSUs to certain non-executive employees, which represented a target number of shares that could be earned subject to the achievement of the Company’s 2023 revenue goals for certain regions or product line divisions, or based on the achievement of the Company’s average two-year (2022 and 2023) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2022 Non-Executive PSUs”). The maximum number of shares that an employee could earn was either 200% or 300% of the target number of the 2022 Non-Executive PSUs, depending on the job classification of the employee. Based on the actual revenue achievement at the end of the performance period, a total of 29,000 shares were awarded to the non-executive employees. 50% of the 2022 Non-Executive PSUs will vest in the first quarter of 2024. The remaining 2022 Non-Executive PSUs will vest over the following two years on an annual or quarterly basis. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2022 Non-Executive PSUs is $11.1 million.

The 2022 Executive PSUs and the 2022 Non-Executive PSUs contained a purchase price feature, which required the employees to pay the Company $30 per share upon vesting of the shares. The $30 purchase price requirement was deemed satisfied and waived if the average stock price for 20 consecutive trading days at any time during 2022 and 2023 was $30 higher than the grant date stock price of $393.16. This market condition was achieved in the first quarter of 2022. The Company determined the grant date fair value of the 2022 Executive PSUs for the first goal and the 2022 Non-Executive PSUs using a Monte Carlo simulation model with the following assumptions: stock price of $393.16, simulation term of four years, expected volatility of 44.6%, risk-free interest rate of 1.5%, and expected dividend yield of 0.8%. In addition, for the 2022 Executive PSUs related to the second goal, the fair value was determined based on the closing stock price at the end of each reporting period, adjusted for accrued dividends and an illiquidity discount of 10.3% to account for the post-vesting sales restrictions.

2021 PSUs:

In February 2021, the Compensation Committee granted 80,000 PSUs to the executive officers, which represented a target number of shares that could be earned subject to the achievement of two sets of performance goals (“2021 Executive PSUs”). For the first goal, the executive officers could earn up to 300% of the target number of the 2021 Executive PSUs based on the achievement of the Company’s average two-year (2021 and 2022) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA. Based on the actual revenue achievement at the end of the performance period, a total of 240,000 shares were awarded to the executive officers. 50% of the 2021 Executive PSUs vested in the first quarter of 2023. The remaining 2021 Executive PSUs vest over the following two years on a quarterly basis. For the second goal, the executive officers could earn an additional 100% of the target number of the 2021 Executive PSUs subject to the achievement of three environmental objectives under the Company’s ESG initiatives with a performance period through December 31, 2023. As of December 31, 2023, all three environmental objectives were achieved and a total of 80,000 shares were awarded to the executive officers. The 2021 Executive PSUs related to the ESG goal fully vested upon achievement of the objectives. All vested shares related to the ESG goal are subject to a post-vesting sales restriction period of one year. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2021 Executive PSUs is $114.4 million. 

In February 2021, the Compensation Committee granted 14,000 PSUs to certain non-executive employees, which represented a target number of shares that could be earned subject to the achievement of the Company’s 2022 revenue goals for certain regions or product line divisions, or based on the achievement of the Company’s average two-year (2021 and 2022) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2021 Non-Executive PSUs”). The maximum number of shares that an employee could earn was either 200% or 300% of the target number of the 2021 Non-Executive PSUs, depending on the job classification of the employee. Based on the actual revenue achievement at the end of the performance period, a total of 33,000 shares were awarded to the non-executive employees. 50% of the 2021 Non-Executive PSUs vested in the first quarter of 2023. The remaining 2021 Non-Executive PSUs vest over the following two years on an annual or quarterly basis. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2021 Non-Executive PSUs is $11.9 million.

The 2021 Executive PSUs and the 2021 Non-Executive PSUs contained a purchase price feature, which required the employees to pay the Company $30 per share upon vesting of the shares. The $30 purchase price requirement was deemed satisfied and waived if the average stock price for 20 consecutive trading days at any time between the grant date and December 31, 2022 was $30 higher than the grant date stock price of $374.57. This market condition was achieved in the third quarter of 2021. The Company determined the grant date fair value of the 2021 Executive PSUs and the 2021 Non-Executive PSUs using a Monte Carlo simulation model with the following assumptions: stock price of $374.57, simulation term of 4.0 years, expected volatility of 41.4%, risk-free interest rate of 0.3%, and expected dividend yield of 0.6%. In addition, the grant date fair value for the 2021 Executive PSUs subject to the ESG goal included an illiquidity discount of 9.8% to account for the post-vesting sales restrictions.

2020 PSUs:

In  February 2020, the Compensation Committee granted 100,000 PSUs to the executive officers, which represented a target number of shares that could be earned based on the Company’s average two-year (2020 and 2021) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2020 Executive PSUs”). The maximum number of shares that an executive officer could earn was 300% of the target number of the 2020 Executive PSUs. Based on the actual revenue achievement at the end of the performance period, a total of 300,000 shares were awarded to the executive officers. 50% of the 2020 Executive PSUs vested in the first quarter of 2022. The remaining 2020 Executive PSUs vest over the following two years on a quarterly basis. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2020 Executive PSUs is $51.1 million.

In  February 2020, the Compensation Committee granted 30,000 PSUs to certain non-executive employees, which represented a target number of shares that could be earned based on the Company’s 2021 revenue goals for certain regions or product line divisions, or based on the Company’s average two-year (2020 and 2021) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the SIA (“2020 Non-Executive PSUs”). The maximum number of shares that an employee could earn was either 200% or 300% of the target number of the 2020 Non-Executive PSUs, depending on the job classification of the employee. Based on the actual revenue achievement at the end of the performance period, a total of 71,000 shares were awarded to the non-executive employees. 50% of the 2020 Non-Executive PSUs vested in the first quarter of 2022. The remaining 2020 Non-Executive PSUs vest over the following two years on an annual or quarterly basis. Based on the actual achievement of the performance goals, the total stock-based compensation cost for the 2020 Non-Executive PSUs is $11.8 million.

The 2020 Executive PSUs and the 2020 Non-Executive PSUs contained a purchase price feature, which required the employees to pay the Company $30 per share upon vesting of the shares. The $30 purchase price requirement was deemed satisfied and waived if the average stock price for 20 consecutive trading days at any time during the performance period was $30 higher than the grant date stock price of $182.62. This market condition was achieved in the second quarter of 2020. The Company determined the grant date fair value of the 2020 Executive PSUs and the 2020 Non-Executive PSUs using a Monte Carlo simulation model with the following assumptions: stock price of $182.62, simulation term of 2.0 years, expected volatility of 33.6%, risk-free interest rate of 1.4%, and expected dividend yield of 1.1%. 

2020 MPSUs:

In  July 2020, the Compensation Committee granted 43,000 MPSUs to the executive officers and 2,000 MPSUs to certain key employees, which represented a target number of shares that could be earned based on the achievement of both market and performance conditions (“2020 MPSUs”). The maximum number of shares that an employee could earn was 500% of the target number of the 2020 MPSUs. The market conditions consisted of five stock price targets ranging from $260 to $300 with a performance period through  July 20, 2023, and the performance condition consisted of one business operating goal related to a revenue target for certain customers with a performance period through  December 31, 2021. As of December 31, 2020, the Company had achieved all five price targets and the operating goal, and a total of 221,000 shares were awarded to the employees. 75% of the 2020 MPSUs vested on  July 20, 2023, and 25% of the 2020 MPSUs will vest on  July 20, 2024. All vested shares are subject to a post-vesting sales restriction period of one year. Based on the actual achievement of the market and performance goals, the total stock-based compensation cost for the 2020 MPSUs is $42.1 million.

The Company determined the grant date fair value of the 2020 MPSUs using a Monte Carlo simulation model with the following assumptions: stock price of $248.71, simulation term of 4.0 years, expected volatility of 38.8%, risk-free interest rate of 0.2%, and expected dividend yield of 0.8%. In addition, the grant date fair value included an illiquidity discount of 8.9% to account for the post-vesting sales restrictions.

MSUs

2022 MSUs:

In October 2022, the Compensation Committee cancelled the 2022 Executive PSUs and granted 159,000 MSUs to the executive officers as replacement awards, which represented a target number of shares that could be earned subject to the achievement of both stock price targets and stock performance compared to the companies comprising the Philadelphia Semiconductor Sector Index (“Peer Group”) over a three-year performance period from October 25, 2022 to October 25, 2025 (“2022 Executive MSUs”). The maximum number of shares that an executive officer could earn was 500% of the target number of the 2022 Executive MSUs if: (1) the Company achieved five stock price targets ranging from $455 to $591 at any time during the performance period, and (2) the Company’s total stockholder return ranked in the 50^th percentile or above relative to the Peer Group at the end of the performance period. As of December 31, 2023, price targets one and two have been achieved. Upon achievement of the performance conditions, the 2022 Executive MSUs will fully vest on October 25, 2025. Under modification accounting, the total stock-based compensation cost was $119.2 million, which was subsequently updated to $124.3 million due to a change of application of accounting methodology. The total stock-based compensation cost of $124.3 million included the unamortized expense of $102.8 million related to 2022 Executive PSUs on the modification date and the incremental cost of $21.5 million related to the 2022 Executive MSUs as a result of the modification. 

The Company determined the grant date fair value of the 2022 Executive MSUs using a Monte Carlo simulation model with the following assumptions: stock price of $342.16, simulation term of three years, expected volatility of 54.0%, risk-free interest rate of 4.4%, and an expected dividend yield of 0.9%. There was no illiquidity discount because the awards did not contain any post-vesting sales restrictions.

In February 2022, the Compensation Committee granted 24,000 MSUs to certain non-executive employees, which represented a target number of shares that could be earned upon achievement of stock price targets (“2022 Non-Executive MSUs”). The maximum number of shares that an employee could earn was 500% of the target number of the 2022 Non-Executive MSUs if the Company achieved five stock price targets ranging from $472 to $590 during a performance period from February 3, 2022 to February 3, 2025. As of December 31, 2023, the Company has achieved all stock price targets. The 2022 Non-Executive MSUs will vest in equal amounts on each of the first, second and third anniversaries of February 3, 2025. The total stock-based compensation cost for the 2022 Non-Executive MSUs is $30.1 million.

The Company determined the grant date fair value of the 2022 Non-Executive MSUs using a Monte Carlo simulation model with the following assumptions: stock price of $393.16, simulation term of six years, expected volatility of 39.0%, risk-free interest rate of 1.7%, and expected dividend yield of 0.8%.

2018 MSUs:

In  October 2018, the Compensation Committee granted 60,000 MSUs to the executive officers and 60,000 MSUs to certain non-executive employees, which represented a target number of shares that could be earned upon achievement of stock price targets (“2018 MSUs”). The maximum number of shares that an employee could earn was 500% of the target number of the 2018 MSUs if the Company achieved five stock price targets ranging from $140 to $172 during a performance period from October 26, 2018 to December 31, 2023. As of December 31, 2019, all stock price targets had been achieved and the employees were awarded a total of 600,000 shares. The 2018 MSUs vested on  January 1, 2024, with post-vesting sales restrictions on the vested shares for up to an additional two years. The total stock-based compensation cost for the 2018 MSUs is $38.5 million.

The Company determined the grant date fair value of the 2018 MSUs using a Monte Carlo simulation model with the following assumptions: stock price of $108.43, expected volatility of 31.6%, a risk-free interest rate of 3.0%, and an illiquidity discount of 8.7% to account for the post-vesting sales restrictions. 

2013 MSUs:

In December 2013, the Compensation Committee granted 276,000 MSUs to the executive officers and 84,000 MSUs to certain non-executive employees, which represented a target number of shares that could be earned upon achievement of stock price targets (“2013 MSUs”). The maximum number of shares that an employee could earn was 500% of the target number of the 2013 MSUs if the Company achieved five price targets ranging from $40 to $56 during a performance period from January 1, 2014 to December 31, 2018. As of December 31, 2015, all stock price targets had been achieved and the employees were awarded a total of 1.8 million shares. The 2013 MSUs vested quarterly from January 1, 2019 to December 31, 2023. The total stock-based compensation cost for the 2013 MSUs is $38.1 million.

The Company determined the grant date fair value of the 2013 MSUs using a Monte Carlo simulation model with the following assumptions: stock price of $31.73, expected volatility of 38.7% and a risk-free interest rate of 1.6%. There was no illiquidity discount because the awards did not contain any post-vesting sales restrictions.

ESPP

In April 2023, the Board of Directors approved, subject to stockholder approval, the amendment and restatement of the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan (the “Amended 2004 ESPP”). The Amended 2004 ESPP, which was subsequently approved by the Company’s stockholders on June 15, 2023, became effective on August 16, 2023, after the final purchase period of the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan (the “2004 ESPP”). The 2004 ESPP provided for an annual increase by an amount equal to the least of one million shares, 2% of the outstanding shares of common stock on the first day of the year, or a number of shares as determined by the Board of Directors. This evergreen provision was removed in the Amended 2004 ESPP. The Amended 2004 ESPP further provides for the issuance of up to 4.4 million shares of the Company’s common stock and will expire on August 16, 2038.

Under both ESPPs, eligible employees may purchase common stock through payroll deductions. Participants may not purchase more than 2,000 shares in a six-month offering period, or purchase shares having a value greater than $25,000 in any calendar year as measured at the beginning of the offering period in accordance with the IRC and applicable treasury regulations. As of December 31, 2023, 4.4 million shares were available for future issuance under the Amended 2004 ESPP.

For the years ended December 31, 2023, 2022 and 2021, 17,000, 14,000 and 17,000 shares, respectively, were issued under the 2004 ESPP and the Amended 2004 ESPP. The intrinsic value of the shares issued was $1.4 million, $1.6 million and $2.4 million for the years ended December 31, 2023, 2022 and 2021, respectively. As of December 31, 2023, the unamortized expense was $0.4 million, which will be recognized through the first quarter of 2024. The Black-Scholes model was used to value the employee stock purchase rights with the following weighted-average assumptions: 

	Year Ended December 31,
	2023			2022			2021
Expected term (in years)		0.5			0.5			0.5
Expected volatility		53.3	%		50.6	%		43.2	%
Risk-free interest rate		5.3	%		1.9	%		0.1	%
Dividend yield		0.8	%		0.6	%		0.6	%

Cash proceeds from the shares issued under the 2004 ESPP and the Amended 2004 ESPP were $7.6 million, $5.9 million and $4.7 million for the years ended December 31, 2023, 2022 and 2021, respectively.

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Note 8 - Stockholders' Equity

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Equity [Text Block]

8. STOCKHOLDER’ EQUITY

Cash Dividend Program

The Company has a dividend program approved by the Board of Directors, pursuant to which the Company intends to pay quarterly cash dividends on its common stock. Based on the Company’s historical practice, stockholders of record as of the last business day of the quarter are entitled to receive the quarterly cash dividends when and if declared by the Board of Directors, which are payable to the stockholders in the following month. The Board of Directors declared the following cash dividends (in thousands, except per share amounts): 

	Year Ended December 31,
	2023		2022		2021
Dividend declared per share	$	4.00	$	3.00	$	2.40
Total amount	$	190,642	$	140,337	$	110,206

As of  December 31, 2023 and 2022, accrued dividends totaled $47.9 million and $35.3 million, respectively.

The declaration of any future cash dividends is at the discretion of the Board of Directors and will depend on, among other things, the Company’s financial condition, results of operations, capital requirements, business conditions, and other factors that the Board of Directors  may deem relevant, as well as a determination that cash dividends are in the best interests of the Company’s stockholders.

The Company anticipates that cash used for future dividend payments will come from its domestic cash, cash generated from ongoing U.S. operations, and cash repatriated from its Bermuda subsidiary. The Company also anticipates that earnings from other foreign subsidiaries will continue to be indefinitely reinvested.

Cash Dividend Equivalent Rights

The Company’s RSUs contain rights to receive cash dividend equivalents, which entitle employees who hold RSUs to the same dividend value per share as holders of common stock. The dividend equivalents are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do not fulfill the requisite service requirement and, as a result, the awards do not vest. As of  December 31, 2023 and 2022, accrued dividend equivalents totaled $11.9 million and $13.8 million, respectively.

Stock Repurchase Program

In October 2023, the Board of Directors approved a new stock repurchase program authorizing the Company to repurchase up to $640.0 million in the aggregate of its common stock through October 29, 2026. Shares are retired upon repurchase. The Company repurchased approximately 7,000 shares of its common stock for an aggregate purchase price of $3.7 million during the year ended December 31, 2023. 

Stock repurchased under the program may be made through open market repurchases, privately negotiated transactions or other structures in accordance with applicable state and federal securities laws, at times and in amounts as management deems appropriate. The timing and the number of any repurchased common stock will be determined by the Company’s management based on its evaluation of market conditions, legal requirements, share price, and other factors. The repurchase program does not obligate the Company to purchase any particular number of shares and may be suspended, modified, or discontinued at any time without prior notice.

The U.S. IRA requires a 1% excise tax of the value of certain stock repurchases in excess of stock issued for employee compensation made after December 31, 2022. This provision did not have an impact on the Company’s consolidated financial statements.

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Note 9 - Other Income (Expense), Net

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Other Nonoperating Income and Expense [Text Block]

9. OTHER INCOME (EXPENSE), NET

The components of other income (expense), net, are as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
Interest income	$	23,363		$	14,369		$	11,637
Amortization of discount (premium) on available-for-sale securities, net		5,277			(4,375	)		(4,674	)
Gain (loss) on deferred compensation plan investments		8,505			(6,600	)		4,563
Charitable contributions		(14,850	)		(5,900	)		(1,500	)
Gain on sale of equity investment		1,424			-			-
Other		386			658			(224	)
Total	$	24,105		$	(1,848	)	$	9,802

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Note 10 - Net Income Per Share

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Earnings Per Share [Text Block]

10.  NET INCOME PER SHARE

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):

	Year Ended December 31,
	2023		2022		2021
Numerator:
Net income	$	427,374	$	437,672	$	242,023
Denominator:
Weighted-average outstanding shares - basic		47,610		46,727		45,851
Effect of dilutive securities		1,161		1,631		2,038
Weighted-average outstanding shares - diluted		48,771		48,358		47,889
Net income per share:
Basic	$	8.98	$	9.37	$	5.28
Diluted	$	8.76	$	9.05	$	5.05

Anti-dilutive common stock equivalents were not material for the periods presented.

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Note 11 - Income Taxes

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Income Tax Disclosure [Text Block]

11.  INCOME TAXES

The components of income before income taxes are as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
United States	$	(15,066	)	$	(30,190	)	$	(15,542	)
Foreign		520,907			555,127			287,761
Income before income taxes	$	505,841		$	524,937		$	272,219

The components of the income tax expense are as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
Current:
Federal	$	61,064		$	95,176		$	24,955
State		4,257			12			35
Foreign		5,702			5,019			3,801
Deferred:
Federal		(1,705	)		(8,523	)		4,929
State		(744	)		-			-
Foreign		9,893			(4,419	)		(3,524	)
Income tax expense	$	78,467		$	87,265		$	30,196

The effective tax rate differs from the applicable U.S. statutory federal income tax rate as follows:

	Year Ended December 31,
	2023			2022			2021
U.S. statutory federal tax rate		21.0	%		21.0	%		21.0	%
Foreign income at lower rates		(21.9	)		(22.8	)		(23.2	)
GILTI		13.5			16.0			11.4
Changes in valuation allowance		2.9			0.2			0.5
Stock-based compensation		2.2			2.8			1.6
Return to provision true-up adjustment		(2.0	)		-			(1.1	)
Tax credits, net of reserves		(1.1	)		(1.2	)		(0.5	)
State income taxes		-			(0.2	)		1.6
Other adjustments		0.9			0.8			(0.2	)
Effective tax rate		15.5	%		16.6	%		11.1	%

The prior years’ return to provision true-up adjustment has been disaggregated to conform with the current-year presentation.

The components of net deferred tax assets consist of the following (in thousands):

	December 31,
	2023			2022
Deferred tax assets:
Tax credits	$	37,518		$	32,037
Stock-based compensation		3,404			2,900
Deferred compensation		11,126			9,844
Net operating losses		12,115			9,000
Other expenses not currently deductible		7,755			8,891
Deferred tax assets, gross		71,918			62,672
Valuation allowance		(35,008	)		(20,321	)
Deferred tax assets, net of valuation allowance		36,910			42,351
Deferred tax liabilities:
Depreciation and amortization		(6,420	)		(5,927	)
Undistributed foreign earnings		(817	)		(358	)
Other expenses currently deductible		(1,619	)		(814	)
Deferred tax liabilities		(8,856	)		(7,099	)
Net deferred tax assets	$	28,054		$	35,252

GILTI:

The Company accounts for GILTI as a period cost. 

Valuation Allowance:

The Company periodically evaluates its deferred tax assets, including a determination of whether a valuation allowance is necessary, based upon its ability to utilize the assets using a more likely than not analysis. The realizability of the Company’s net deferred tax assets is dependent on its ability to generate sufficient future taxable income during periods prior to the expiration of tax attributes to fully utilize these assets. As of December 31, 2023 and 2022, the Company has evaluated the realization of its deferred tax assets and recorded a valuation allowance for assets that do not meet the more-likely-than-not recognition threshold. 

A reconciliation of the beginning and ending balance of valuation allowances is as follows (in thousands):

Period	Balance at Beginning of Period		Additions		Reductions			Balance at End of Period
Year ended December 31, 2021	$	18,190	$	1,560	$	(230	)	$	19,520
Year ended December 31, 2022	$	19,520	$	1,743	$	(942	)	$	20,321
Year ended December 31, 2023	$	20,321	$	15,405	$	(718	)	$	35,008

The additions in 2023 were primarily the result of a change in foreign tax law in 2023 that negatively impacted the realizability of foreign deferred tax assets.

Undistributed Earnings of Subsidiaries:

The Company has analyzed its global working capital and cash requirements, and has determined that it plans to repatriate cash from its Bermuda subsidiary on an ongoing basis to fund its future U.S.-based expenditures and dividends. For the years ended December 31, 2023 and 2021, the Company repatriated $140.0 million and $70.0 million from its Bermuda subsidiary, respectively. No cash was repatriated from the subsidiary during the year ended December 31, 2022.

For all other foreign subsidiaries, the Company expects to indefinitely reinvest undistributed earnings to fund their operations and R&D. As of December 31, 2023 and 2022, the undistributed earnings were approximately $85.0 million and $67.4 million, respectively. An actual repatriation of the undistributed earnings could be subject to additional foreign withholding taxes and U.S. state taxes. The Company expects to be able to take a dividend received deduction to offset any U.S. federal income tax liability on the undistributed earnings. Determination of the unrecognized state and withholding deferred tax liability is not practicable at this time due to the complexities associated with the hypothetical calculation.

Other Income Tax Provision Matters

As of December 31, 2023, the Company did not have federal net operating loss carryforwards. As of December 31, 2023, the state net operating loss carryforwards for income tax purposes were $3.6 million, which will expire beginning in 2029. As of December 31, 2023, the Company has foreign net operating loss carryforwards for income tax purposes of $92.7 million, which will expire beginning in 2029. 

As of December 31, 2023, the Company had no R&D tax credit carryforwards for federal income tax purposes, and $40.6 million for state income tax purposes, which can be carried forward indefinitely.

In the event of a change in ownership, as defined under federal and state tax laws, the Company’s net operating loss and tax credit carryforwards could be subject to annual limitations. The annual limitations could result in the expiration of the net operating loss and tax credit carryforwards prior to utilization.

  

As of December 31, 2023, the Company had $62.7 million of unrecognized tax benefits, $48.9 million of which would affect its effective tax rate if recognized after considering the valuation allowance. As of December 31, 2022, the Company had $49.3 million of unrecognized tax benefits, $38.3 million of which would affect its effective tax rate if recognized after considering the valuation allowance. 

A reconciliation of the gross unrecognized tax benefits is as follows (in thousands): 

Balance as of January 1, 2021	$	33,499
Increase for tax position of current year		9,191
Decrease for tax position of prior year		(657	)
Decrease due to settlement with tax authorities		(54	)
Decrease due to lapse of statute of limitation		(458	)
Balance as of December 31, 2021		41,521
Increase for tax position of current year		10,965
Increase for tax position of prior year		247
Decrease due to settlement with tax authorities		(970	)
Decrease due to lapse of statute of limitation		(2,486	)
Balance as of December 31, 2022		49,277
Increase for tax position of current year		14,108
Increase for tax position of prior year		2,209
Decrease due to lapse of statute of limitation		(1,926	)
Decrease for tax positions of prior year		(1,008	)
Balance as of December 31, 2023	$	62,660

The Company recognizes interest and penalties, if any, related to uncertain tax positions in its income tax provision. As of December 31, 2023 and 2022, the Company has $5.7 million and $4.3 million, respectively, of accrued interest related to uncertain tax positions, which were recorded in income tax liabilities on the Consolidated Balance Sheets.

  

Uncertain tax positions relate to the allocation of income and deductions among the Company’s global entities and to the determination of the R&D tax credit. It is reasonably possible that the balance of gross unrecognized tax benefits could significantly change in the next 12 months. However, it is not possible to determine either the magnitude or the range of increases or decreases at this time.

  

The Company currently has reduced tax rates in its subsidiaries in Chengdu and Hangzhou, China through 2026 and 2024, respectively, for performing R&D activities.

On December 27, 2023, the Bermuda CIT Act was enacted and signed into law. It includes a 15% CIT applicable to Bermuda businesses that are MNE with annual revenue of €750M or more beginning in 2025. The Bermuda CIT Act also includes an ETA that requires MNE’s to revalue their assets and liabilities, excluding goodwill, at their fair value as of September 30, 2023. There is an election to opt out of the ETA. As the Bermuda CIT Act is not effective until January 1, 2025, the Company is evaluating whether or not to adopt this ETA. Based on the information available, the Company has not recorded any changes to income tax expense related to the Bermuda CIT Act as of December 31, 2023.

On August 9, 2022, the U.S. government enacted the CHIPS Act to provide certain financial and tax incentives to the semiconductor industry, primarily for manufacturing activities within the United States. On August 16, 2022, the IRA was enacted and signed into law. The IRA, among other things, introduces a new 15% corporate minimum tax, based on adjusted financial statement income of certain large corporations, and imposes a 1% excise tax on certain stock repurchases. This excise tax is effective January 1, 2023. The CHIPS Act and the IRA had no material impact on the income tax provisions, results of operations or financial condition of the Company for the year ended December 31, 2023 and 2022.

Income Tax Examination

The Company is subject to examination of its income tax returns by the IRS and other tax authorities. In general, the tax years for 2007 and forward are open for examination for U.S. federal and state income tax purposes.

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Note 12 - Commitments and Contingencies

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

12.  COMMITMENTS AND CONTINGENCIES

Warranty and Indemnification Provisions

The changes in warranty reserves are as follows (in thousands):

	Year Ended December 31,
	2023			2022			2021
Balance at beginning of period	$	24,082		$	20,989		$	6,895
Warranties issued		2,929			3,092			10,558
Repairs, replacement and refund		(2,708	)		(2,357	)		(1,770	)
Changes in liability for pre-existing warranties		(7,397	)		2,358			5,306
Balance at end of period	$	16,906		$	24,082		$	20,989

Changes in liability for pre-existing warranties result from changes in estimates for warranties issued in prior periods.

The Company provides indemnification agreements to certain direct or indirect customers. The Company agrees to reimburse these parties for any damages, costs and expenses incurred by them as a result of legal actions taken against them by third parties for infringing upon their intellectual property rights as a result of using the Company’s products and technologies. These indemnification provisions are varied in scope and are subject to certain terms, conditions, limitations and exclusions. In addition, the Company has entered into indemnification agreements with its directors and officers.

It is not possible to predict the maximum potential amount of future payments under these agreements due to the limited history of indemnification claims and the unique facts and circumstances involved in each particular agreement. There were no indemnification liabilities incurred for the periods presented. However, there can be no assurances that the Company will not incur any financial liabilities in the future as a result of these obligations.

Purchase Commitments

The Company has outstanding purchase obligations with its suppliers and other parties that require the purchases of goods or services. The purchase obligations primarily consist of wafer and other inventory purchases, assembly and other manufacturing services, construction of manufacturing and R&D facilities, purchases of production and other equipment, and license arrangements.

In May 2022, the Company entered into a long-term supply agreement in order to secure manufacturing production capacity for silicon wafers over a four-year period. As of December 31, 2023, the Company had remaining prepayments under this agreement of $120.0 million reported in other long-term assets on the Consolidated Balance Sheet.

Total estimated future unconditional purchase commitments to all suppliers and other parties, net of the $120.0 million prepayment, as of December 31, 2023 were as follows (in thousands):

2024	$	367,842
2025		298,958
2026		1,668
2027		31,266
Total	$	699,734

Litigation

The Company is a party to actions and proceedings in the ordinary course of business, including challenges to the enforceability or validity of its intellectual property, claims that the Company’s products infringe on the intellectual property rights of others, and employment matters. The Company may also be subject to litigation initiated by its stockholders. These proceedings often involve complex questions of fact and law and may require the expenditure of significant funds and the diversion of other resources to prosecute and defend. The Company defends itself vigorously against any such claims. As of December 31, 2023, there were no material pending legal proceedings to which the Company was a party.

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Note 13 - Employee 401(k) Plan

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Retirement Benefits [Text Block]

13.  EMPLOYEE 401(k) PLAN

The Company sponsors a 401(k) retirement savings plan for all employees in the U.S. who meet certain eligibility requirements. Participants may contribute up to the amount allowable as a deduction for federal income tax purposes. The Company is not required to contribute and did not contribute to the plan for the years ended December 31, 2023, 2022 and 2021. 

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Note 14 - Significant Customers

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Concentration Risk Disclosure [Text Block]

14.  SIGNIFICANT CUSTOMERS

The Company sells its products primarily through third-party distributors and value-added resellers, and directly to OEMs, ODMs and EMS providers. The following table summarizes those customers with sales equal to 10% or more of the Company’s total revenue: 

	Year Ended December 31,
Customer	2023			2022			2021
Distributor A		26	%		24	%		26	%
Distributor B		19	%		19	%		15	%
Distributor C		10	%		*			10	%

* Represents less than 10%.

The Company’s agreements with these third-party customers were made in the ordinary course of business and  may be terminated with or without cause by these customers with advance notice. Although the Company  may experience a short-term disruption in the distribution of its products and a short-term decline in revenue if its agreement with any of the distributors were terminated, the Company believes that such termination would not have a material adverse effect on its financial statements because it would be able to engage alternative distributors, resellers and other distribution channels to deliver its products to end customers within a short period following any termination of the agreement with a distributor.

The following table summarizes those customers with accounts receivable equal to 10% or more of the Company’s total accounts receivable:  

	December 31,
Customer		2023		2022
Distributor A		42	%	29	%
Distributor B		13	%	23	%
Distributor C		10	%	*

* Represents less than 10%.

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Note 15 - Segment and Geographic Information

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Segment Reporting Disclosure [Text Block]

15.  SEGMENT AND GEOGRAPHIC INFORMATION

The Company operates in one reportable segment that includes the design, development, marketing and sale of high-performance, semiconductor-based power electronic solutions for the storage and computing, enterprise data, automotive, industrial, communications and consumer markets. The Company’s chief operating decision maker is its Chief Executive Officer, who reviews financial information presented on a consolidated basis for the purposes of allocating resources and evaluating financial performance. The Company derives a majority of its revenue from sales to customers located outside North America, with geographic revenue based on the customers’ ship-to locations.  

The following is a summary of revenue by geographic region (in thousands):

	Year Ended December 31,
Country or Region	2023		2022		2021
China	$	934,768	$	938,946	$	700,985
Taiwan		307,499		233,040		169,130
South Korea		169,867		189,478		93,027
Europe		132,620		145,584		85,201
United States		97,294		99,804		35,770
Japan		93,340		91,048		68,720
Southeast Asia		85,150		95,739		54,611
Other		534		509		354
Total	$	1,821,072	$	1,794,148	$	1,207,798

The following is a summary of revenue by major product family (in thousands):

	Year Ended December 31,
Product Family	2023		2022		2021
DC to DC	$	1,718,623	$	1,696,594	$	1,147,329
Lighting Control		102,449		97,554		60,469
Total	$	1,821,072	$	1,794,148	$	1,207,798

The following is a summary of long-lived assets by geographic region (in thousands): 

	December 31,
Country	2023		2022		2021
China	$	184,685	$	200,508	$	211,973
United States		119,430		113,996		113,805
Taiwan		39,419		20,074		19,607
Other		25,418		22,579		17,577
Total	$	368,952	$	357,157	$	362,962

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Note 16 - Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Comprehensive Income (Loss) Note [Text Block]

16. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table summarizes the changes in accumulated other comprehensive income (loss) (in thousands):

	Unrealized Losses on Available-for-Sale Securities			Foreign Currency Translation Adjustments			Total
Balance as of January 1, 2022	$	(1,063	)	$	16,943		$	15,880
Other comprehensive loss before reclassifications		(6,944	)		(32,293	)		(39,237	)
Amounts reclassified from accumulated other comprehensive loss		96			-			96
Tax effect		184			-			184
Net current period other comprehensive loss		(6,664	)		(32,293	)		(38,957	)
Balance as of December 31, 2022		(7,727	)		(15,350	)		(23,077	)
Other comprehensive income (loss) before reclassifications		6,896			(9,528	)		(2,632	)
Amounts reclassified from accumulated other comprehensive income		(1	)		-			(1	)
Tax effect		(1,352	)		-			(1,352	)
Net current period other comprehensive income (loss)		5,543			(9,528	)		(3,985	)
Balance as of December 31, 2023	$	(2,184	)	$	(24,878	)	$	(27,062	)

The amounts reclassified from accumulated other comprehensive income (loss) were recorded in other income (expense), net, on the Consolidated Statements of Operations.  

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Note 17 - Subsequent Events

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Subsequent Events [Text Block]

17. SUBSEQUENT EVENTS

Acquisition 

In January 2024, the Company completed the acquisition of Axign in a cash transaction in exchange for all outstanding Axign shares. Axign is a Dutch company that designs and develops class-D audio ICs, targeting applications ranging from portable consumer speakers to automotive and professional-grade multi-speaker systems. The preliminary total purchase consideration was approximately $33.8 million. The initial accounting for the acquisition, including the valuation of assets acquired and liabilities assumed, is still ongoing as of the date this Annual Report on Form 10-K is issued.

Cash Dividend Increase

In February 2024, the Board of Directors approved an increase in quarterly cash dividends from $1.00 per share to $1.25 per share.

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Insider Trading Arrangements

12 Months Ended

Dec. 31, 2023

Insider Trading Arr Line Items

Material Terms of Trading Arrangement [Text Block]

Item 9B. Other Information

10b5-1 Trading Plans

Certain of our executive officers have entered into trading plans pursuant to Rule 10b5-1(c) of the Securities Exchange Act of 1934, as amended. A trading plan is a written document that pre-establishes the amounts, prices and dates (or formula for determining the amounts, prices and dates) of future purchases or sales of our common stock, including the sale of shares acquired pursuant to the 2004 ESPP and the Amended 2004 ESPP, and upon vesting of RSUs. During the three months ended December 31, 2023, no director or officer of the Company adopted, modified or terminated trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) as defined in Item 408(a) of Regulation S-K. During the three months ended December 31, 2023, no pre-existing trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) were modified or terminated, and no other written trading arrangements that are not intended to qualify for the Rule 10b5-1(c) affirmative defense were adopted, modified, or terminated.

Rule 10b5-1 Arrangement Adopted [Flag]

false

Rule 10b5-1 Arrangement Terminated [Flag]

false

Non-Rule 10b5-1 Arrangement Adopted [Flag]

false

Non-Rule 10b5-1 Arrangement Terminated [Flag]

false

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Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

Basis of Presentation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions used in these consolidated financial statements primarily include those related to revenue recognition, inventory valuation, valuation of share-based awards, contingencies and income tax valuation allowances. Actual results could differ from these estimates and assumptions, and any such differences  may be material to the Company’s consolidated financial statements. 

Concentration Risk, Credit Risk, Policy [Policy Text Block]

Certain Significant Risks and Uncertainties

Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash equivalents, short-term and long-term investments and accounts receivable. The Company’s cash equivalents include short-term, highly liquid investments purchased with remaining maturities at the date of purchase of three months or less. The Company’s short-term investments may consist of corporate debt securities, certificates of deposit, commercial paper and government agency bonds and treasuries, and the long-term investments consist of government-backed student loan auction-rate securities.

The Company does not require its customers to provide collateral to support accounts receivable. The Company assesses the collectability by reviewing accounts receivable on a customer-by-customer basis. To manage credit risk, management performs ongoing credit evaluations of the customers’ financial condition, monitors payment performance, and assesses current economic conditions, as well as reasonable and supportable forecasts of future economic conditions, that  may affect collectability of the outstanding receivables. For certain high-risk customers, the Company requires standby letters of credit or advance payment prior to shipments of goods.

The Company participates in the dynamic high technology industry and believes that changes in any of the following areas could have a material adverse effect on its future financial position, results of operations or cash flows: advances and trends in new technologies and industry standards; competitive pressures in the form of new products or price reductions on current products; changes in product mix; changes in the overall demand for products offered by the Company or in specific markets; changes in third-party manufacturers or the terms of such arrangements; changes in key suppliers; changes in certain strategic relationships or customer relationships; litigation or claims against the Company based on intellectual property, patent, product, regulatory or other factors; fluctuations in foreign currency exchange rates; risk associated with changes in government policies and regulations on trade restrictions and corporate taxes; availability of necessary components or sub-assemblies; availability of foundry capacity; ability to integrate acquired companies; and the Company’s ability to attract and retain employees necessary to support its growth.

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency  

In general, the functional currency of the Company’s international subsidiaries is the local currency. The primary subsidiaries are located in China, Taiwan and Europe, which utilize the Renminbi, the New Taiwan Dollar and the Euro as their currencies, respectively. Accordingly, assets and liabilities of the foreign subsidiaries are translated using exchange rates in effect at the end of the period. Revenue and costs are translated using average exchange rates for the period. The resulting translation adjustments are recorded in accumulated other comprehensive loss on the Consolidated Balance Sheets.

In addition, the Company incurs foreign currency exchange gains or losses related to certain transactions, including intercompany transactions, that are denominated in a currency other than the functional currency. In connection with the remeasurement and settlement of the balances, the Company recorded foreign currency exchange gain (loss) of $(0.2) million, $0.5 million and $(0.7) million for the years ended December 31, 2023, 2022 and 2021, respectively, which were reported in other income (expense), net, on the Consolidated Statements of Operations.

For intercompany transactions that are of a long-term investment nature, the Company records the foreign currency exchange gains and losses in accumulated other comprehensive loss on the Consolidated Balance Sheets.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash Equivalents and Debt Investments 

The Company classifies all highly liquid investments with stated maturities of three months or less from date of purchase as cash equivalents. The Company may classify investments with maturities beyond one year as short-term based on the nature of the investments and their availability for use in current operations.

Cash equivalents are stated at cost, which approximates fair market value. The Company’s short-term and long-term debt investments are classified as available-for-sale securities and are stated at their fair market value, with unrealized gains and losses recorded in accumulated other comprehensive loss on the Consolidated Balance Sheets. Premiums and discounts on debt investments are generally amortized or accreted over the life of the related available-for-sale securities. Interest income is recognized when earned. The cost of investments sold is determined on the basis of the specific identification method.

Available-for-sale investments are subject to impairment reviews when the fair value is below the amortized cost basis. If the Company determines that the decline in fair value below the amortized cost basis is due to credit-related factors, the impairment is recognized as an allowance on the Consolidated Balance Sheets with a corresponding adjustment to earnings. An impairment that is not credit-related is recognized in accumulated other comprehensive loss on the Consolidated Balance Sheets. If the Company intends to sell the impaired investments, or more likely than not will be required to sell such investments before recovering the amortized cost basis, the entire impairment amount is recognized in earnings with a corresponding adjustment to the amortized cost basis.

Equity Securities without Readily Determinable Fair Value [Policy Text Block]

Equity Investments

Equity investments in privately held companies without readily determinable fair values are accounted for under the measurement alternative method, provided that the Company does not have the ability to exercise significant influence or control over the investees. Under this method, the Company measures the investments at cost, less any impairment, and adjusts the carrying value of the investments to fair value resulting from observable transactions for identical or similar investments of the same issuer. The Company records the investments in other long-term assets on the Consolidated Balance Sheets, and gains and losses on the investments are recognized in other income (expense), net, on the Consolidated Statements of Operations.

The Company monitors its non-marketable equity investments for impairment indicators, such as negative changes in industry and market conditions, financial performance, business prospects, and other relevant events and factors. If indicators exist for a security and the fair value is below the carrying amount, the Company writes down the security to fair value.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments

Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value, the Company considers the principal or most advantageous market in which the Company would transact, as well as assumptions that market participants would use when pricing the assets or liabilities. Fair value is estimated by applying the fair value hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement. See Note 4 for additional information on the fair value of the Company’s financial instruments.

Inventory, Policy [Policy Text Block]

Inventories

Inventories are stated at the lower of standard cost (which approximates actual cost determined on a first-in first-out basis) and estimated net realizable value. The Company writes down excess and obsolete inventories based on their age and forecasted demand, which includes estimates taking into consideration the Company’s revenue forecast, outlook on market and economic conditions, technology changes, new product introductions and changes in strategic direction. Actual demand may differ from forecasted demand, and such a difference  may have a material effect on recorded inventory values. When the Company records a write-down on inventory, it establishes a new, lower cost basis for that inventory, and subsequent changes in facts and circumstances will not result in the restoration or increase in that newly established cost basis.

Property, Plant and Equipment, Policy [Policy Text Block]

Property and Equipment

Property and equipment are stated at cost. Depreciation commences when an asset is placed in service and available for its intended use. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Buildings and building improvements have estimated useful lives of 20 to 40 years. Leasehold improvements are amortized over the shorter of the estimated useful lives or the lease period. Production equipment, lab equipment and software have estimated useful lives of three to eight years. Transportation equipment has estimated useful lives of 5 to 20 years. Furniture and fixtures have estimated useful lives of three to five years. Land is not depreciated.

Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]

Impairment of Long-Lived Assets

The Company evaluates its long-lived assets other than goodwill for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss would be recognized when the sum of the undiscounted future net cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount. Such impairment loss would be measured as the difference between the carrying amount of the asset and its fair value based on the present value of estimated future cash flows. The Company did not record material impairments in any of the periods presented.

Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]

Goodwill

Goodwill represents the excess of the fair value of purchase consideration over the fair value of net tangible and identified intangible assets as of the date of acquisition. Goodwill is not amortized.

The Company tests goodwill for impairment at least annually in the fourth quarter of each year, or whenever events or changes in circumstances indicate that goodwill may be impaired. The Company has elected to first assess the qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines that it is more likely than not that the fair value of the reporting unit is less than the carrying amount, then a quantitative goodwill impairment test is performed to measure the impairment loss. No impairment of goodwill has been identified in any of the periods presented.  

Deferred Compensation Plan, Policy [Policy Text Block]

Deferred Compensation Plan 

The Company has a non-qualified, unfunded deferred compensation plan, which provides certain key employees, including executive officers, with the ability to defer the receipt of compensation in order to accumulate funds for retirement on a tax deferred basis. The Company does not make contributions to the plan or guarantee returns on the investments. The Company is responsible for the plan’s administrative expenses. Participants’ deferrals and investment gains and losses remain as the Company’s liabilities and the underlying assets are subject to claims of general creditors.

The liabilities for compensation deferred under the plan are recorded at fair value as of the end of each reporting period. Changes in the fair value of the liabilities are included in operating expenses on the Consolidated Statements of Operations. The Company manages the risk of changes in the fair value of the liabilities by electing to match the liabilities with investments in corporate-owned life insurance policies, mutual funds and money market funds that offset a substantial portion of the exposure. The investments are recorded at the cash surrender value of the corporate-owned life insurance policies, and at the fair value of the mutual funds and money market funds, which are classified as trading securities. Changes in the cash surrender value of the corporate-owned life insurance policies and the fair value of mutual fund and money market fund investments are included in other income (expense), net, on the Consolidated Statements of Operations. The following table summarizes the deferred compensation plan balances on the Consolidated Balance Sheets (in thousands): 

	December 31,
	2023		2022
Deferred compensation plan asset components:
Cash surrender value of corporate-owned life insurance policies	$	23,545	$	19,089
Fair value of mutual funds and money market funds		54,836		43,933
Total	$	78,381	$	63,022
Deferred compensation plan assets reported in:
Other long-term assets	$	78,381	$	63,022
Deferred compensation plan liabilities reported in:
Accrued compensation and related benefits (short-term)	$	384	$	118
Other long-term liabilities		80,903		64,863
Total	$	81,287	$	64,981

Revenue from Contract with Customer [Policy Text Block]

Revenue Recognition

The Company recognizes revenue when it transfers control of promised goods or services to its customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. See Note 2 for further discussion.

Research and Development Expense, Policy [Policy Text Block]

R&D

Costs incurred in R&D are expensed as incurred.

Standard Product Warranty, Policy [Policy Text Block]

Warranty Reserve

The Company generally provides either a one- or two-year warranty against defects in materials and workmanship and will repair the products, provide replacements at no charge to customers or issue a refund. As they are considered assurance-type warranties, the Company does not account for them as separate performance obligations. Warranty reserve requirements are generally based on a specific assessment of the products sold with warranties when a customer asserts a claim for warranty or a product defect. 

Lessee, Leases [Policy Text Block]

Leases

The Company determines if an arrangement is a lease at inception. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Operating lease right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term, and operating lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of remaining lease payments over the lease term. ROU assets also include any initial direct costs incurred and prepaid lease payments, less lease incentives received. Because the implicit rate in each lease is not readily determinable, the Company uses its estimated incremental borrowing rate to determine the present value of the remaining lease payment. The Company recognizes operating lease costs on a straight-line basis over the lease term.

The Company does not record short-term leases with a term of 12 months or less at the commencement date on the Consolidated Balance Sheets. For lease arrangements that contain lease and non-lease components, the Company accounts for them as single lease components.

For lease arrangements where the Company is the lessor, the Company recognizes lease income from operating leases on a straight-line basis over the lease term.

Share-Based Payment Arrangement [Policy Text Block]

Stock-Based Compensation

The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The fair value of RSUs with only service conditions is determined based on the grant date stock price. The fair value of all other awards is determined based on the following valuation methods:

Type of Awards	Valuation Method
RSUs with performance conditions (“PSUs”) that have a purchase price adjustment	Monte Carlo simulation model
RSUs with market conditions (“MSUs”)	Monte Carlo simulation model
RSUs with both performance and market conditions (“MPSUs”)	Monte Carlo simulation model
Shares issued under the employee stock purchase plan (“ESPP”)	Black-Scholes model

The valuation models consider inputs including stock price, expected volatility, expected term of awards, risk-free interest rate, and expected dividend yield. Expected volatility used in the models is determined based on historical volatility of the Company’s stock price for the period, which corresponds to the expected term of the awards, immediately preceding the granting of the awards.

Compensation expense related to awards with service conditions is recorded on a straight-line basis over the requisite service period. Compensation expense related to awards subject to performance or market conditions is recognized over the requisite service period for each separately vesting tranche. For awards with only market conditions, compensation expense is not reversed if the market conditions are not satisfied. For awards with only performance conditions, as well as awards containing both market and performance conditions, the Company recognizes compensation expense when it becomes probable that the performance goals will be achieved. Management performs the probability assessment on a quarterly basis by reviewing external factors, such as macroeconomic conditions and the analog industry revenue forecasts, and internal factors, such as the Company’s business and operational objectives and revenue forecasts. Changes in the probability assessment of achievement of the performance conditions are accounted for in the period of change by recording a cumulative catch-up adjustment as if the new estimate had been applied since the service inception date. Any previously recognized compensation expense is reversed if the performance conditions are not expected to be satisfied as a result of management’s assessment.

The Company accounts for forfeitures of equity awards when they occur.

Income Tax, Policy [Policy Text Block]

Accounting for Income Taxes 

The Company recognizes federal, state and foreign current tax liabilities or assets based on its estimate of taxes payable or refundable in the current fiscal year by tax jurisdiction. The Company also recognizes federal, state and foreign deferred tax assets or liabilities for its estimate of future tax effects attributable to temporary differences and carryforwards. The Company records a valuation allowance to reduce any deferred tax assets by the amount of any tax benefits that, based on available evidence and judgment, are not expected to be realized.

The Company’s calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments and involves dealing with uncertainties in the application of complex tax laws. The Company’s estimates of current and deferred tax assets and liabilities may change based on, in part, added certainty, finality or uncertainty to an anticipated outcome, changes in accounting or tax laws in the U.S. or foreign jurisdictions where the Company operates, or changes in other facts or circumstances. In addition, the Company recognizes liabilities for potential U.S. and foreign income tax for uncertain income tax positions taken on its tax returns if it has less than a 50% likelihood of being sustained. If the Company determines that payment of these amounts is unnecessary or if the recorded tax liability is less than its current assessment, the Company may be required to recognize an income tax benefit or additional income tax expense in its financial statements in the period such determination is made. The Company has calculated its uncertain tax positions which were attributable to certain estimates and judgments.

Litigation and Contingencies, Policy [Policy Text Block]

Litigation and Contingencies

The Company is a party to actions and proceedings in the ordinary course of business, including challenges to the enforceability or validity of its intellectual property, claims that the Company’s products infringe on the intellectual property rights of others, and employment matters. The Company may also be subject to litigation initiated by its stockholders. The pending proceedings involve complex questions of fact and law and will require the expenditure of significant funds and the diversion of other resources to prosecute and defend. In addition, from time to time, the Company becomes aware that it is subject to other contingent liabilities. When this occurs, the Company will evaluate the appropriate accounting for the potential contingent liabilities to determine whether a contingent liability should be recorded. In making this determination, management may, depending on the nature of the matter, consult with internal and external legal counsel and technical experts. Based on the facts and circumstances in each matter, the Company uses its judgment to determine whether it is probable that a contingent loss has occurred and whether the amount of such loss can be estimated. If the Company determines a loss is probable and estimable, the Company records a contingent loss. In determining the amount of a contingent loss, the Company takes into account advice received from experts for each specific matter regarding the status of legal proceedings, settlement negotiations, prior case history and other factors. Should the judgments and estimates made by management need to be adjusted as additional information becomes available, the Company may need to record additional contingent losses. Alternatively, if the judgments and estimates made by management are adjusted, for example, if a particular contingent loss does not occur, the contingent loss recorded would be reversed.

Earnings Per Share, Policy [Policy Text Block]

Net Income per Share

Basic net income per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into shares of common stock, and calculated using the treasury stock method. Contingently issuable shares, including equity awards with performance conditions or market conditions, are considered outstanding shares of common stock and included in the basic net income per share as of the date that all necessary conditions to earn the awards have been satisfied. Prior to the end of the contingency period, the number of contingently issuable shares included in the diluted net income per share is based on the number of shares, if any, that would be issuable under the terms of the arrangement at the end of the reporting period.

The Company’s RSUs contain forfeitable rights to receive cash dividend equivalents, which are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do not fulfill the requisite service requirement and, as a result, the awards do not vest. Accordingly, these awards are not treated as participating securities in the net income per share calculation. 

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income 

Comprehensive income represents the change in the Company’s net assets during the period from non-owner sources. Accumulated other comprehensive loss presented on the Consolidated Balance Sheets primarily consists of unrealized gains or losses related to available-for-sale investments and foreign currency translation adjustments.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Adopted Accounting Pronouncement

In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. The guidance requires an acquirer to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Accounting Standards Codification 606, Revenue from Contracts with Customers, as if it had originated the contracts. The Company adopted this guidance at the beginning of fiscal year 2023 prospectively and it did not impact the consolidated financial statements for the year ended December 31, 2023. The Company is evaluating the impact of this guidance on its recent acquisition but does not expect a material impact on its consolidated financial statements. See Note 17 for additional information regarding this acquisition.

New Accounting Pronouncements Not Yet Adopted as of December 31, 2023

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which aims to improve disclosures regarding a public entity’s reportable segments, primarily through more comprehensive disclosures around significant segment expenses. The guidance will be effective for the annual reporting for fiscal year 2024 and interim reporting for the first quarter in 2025, and should be applied retroactively to all prior periods presented. The Company is evaluating the impact of adoption on its consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which aims to improve an entity’s income tax disclosures around its effective rate reconciliation, income taxes paid, disaggregation of income before income taxes and income tax expense. The guidance will be effective for annual reporting for fiscal year 2025. The standard should be applied prospectively and retrospective application is permitted. The Company does not expect the adoption of this standard to have a material impact on its consolidated financial statements.

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Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Deferred Compensation Plan [Table Text Block]

	December 31,
	2023		2022
Deferred compensation plan asset components:
Cash surrender value of corporate-owned life insurance policies	$	23,545	$	19,089
Fair value of mutual funds and money market funds		54,836		43,933
Total	$	78,381	$	63,022
Deferred compensation plan assets reported in:
Other long-term assets	$	78,381	$	63,022
Deferred compensation plan liabilities reported in:
Accrued compensation and related benefits (short-term)	$	384	$	118
Other long-term liabilities		80,903		64,863
Total	$	81,287	$	64,981

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Note 3 - Cash, Cash Equivalents, Investments and Restricted Cash (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Fair Value, by Balance Sheet Grouping [Table Text Block]

	December 31,
	2023		2022
Cash	$	392,329	$	273,145
Money market funds		135,514		15,462
Certificates of deposit		127,123		130,467
Corporate debt securities		95,101		292,586
Commercial paper		-		17,928
U.S. treasuries and government agency bonds		358,409		8,285
Auction-rate securities backed by student-loan notes		567		1,711
Total	$	1,109,043	$	739,584

	December 31,
	2023		2022
Reported as:
Cash and cash equivalents	$	527,843	$	288,607
Short-term investments		580,633		449,266
Investment within other long-term assets		567		1,711
Total	$	1,109,043	$	739,584

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Due in less than 1 year	$	398,670	$	397,884
Due in 1 - 5 years		183,266		182,749
Due in greater than 5 years		574		567
Total	$	582,510	$	581,200

Unrealized Gain (Loss) on Investments [Table Text Block]

	December 31, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Money market funds	$	135,514	$	-	$	-		$	135,514
Certificates of deposit		127,123		-		-			127,123
Corporate debt securities		96,636		4		(1,539	)		95,101
U.S. treasuries and government agency bonds		358,177		327		(95	)		358,409
Auction-rate securities backed by student-loan notes		574		-		(7	)		567
Total	$	718,024	$	331	$	(1,641	)	$	716,714

	December 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Money market funds	$	15,462	$	-	$	-		$	15,462
Certificates of deposit		130,467		-		-			130,467
Corporate debt securities		300,529		18		(7,961	)		292,586
Commercial paper		17,928		-		-			17,928
U.S. treasuries and government agency bonds		8,487		-		(202	)		8,285
Auction-rate securities backed by student-loan notes		1,770		-		(59	)		1,711
Total	$	474,643	$	18	$	(8,222	)	$	466,439

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

	December 31, 2023
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	20,792	$	(19	)	$	70,806	$	(1,520	)	$	91,598	$	(1,539	)
U.S. treasuries and government agency bonds		97,599		(95	)		-		-			97,599		(95	)
Auction-rate securities backed by student-loan notes		-		-			567		(7	)		567		(7	)
Total	$	118,391	$	(114	)	$	71,373	$	(1,527	)	$	189,764	$	(1,641	)

	December 31, 2022
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	72,943	$	(973	)	$	202,074	$	(6,988	)	$	275,017	$	(7,961	)
U.S. treasuries and government agency bonds		987		(2	)		7,298		(200	)		8,285		(202	)
Auction-rate securities backed by student-loan notes		-		-			1,711		(59	)		1,711		(59	)
Total	$	73,930	$	(975	)	$	211,083	$	(7,247	)	$	285,013	$	(8,222	)

Restrictions on Cash and Cash Equivalents [Table Text Block]

	December 31,
	2023		2022
Cash and cash equivalents	$	527,843	$	288,607
Restricted cash included in other current assets		33,204		-
Restricted cash included in other long-term assets		134		122
Total cash, cash equivalents and restricted cash reported on the Consolidated Statements of Cash Flows	$	561,181	$	288,729

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Note 4 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Money market funds	$	135,514	$	135,514	$	-	$	-
Certificates of deposit		127,123		-		127,123		-
Corporate debt securities		95,101		-		95,101		-
U.S. treasuries and government agency bonds		358,409		-		358,409		-
Auction-rate securities backed by student-loan notes		567		-		-		567
Mutual funds and money market funds under deferred compensation plan		54,836		54,836		-		-
Total	$	771,550	$	190,350	$	580,633	$	567

	December 31, 2022
	Total		Level 1		Level 2		Level 3
Money market funds	$	15,462	$	15,462	$	-	$	-
Certificates of deposit		130,467		-		130,467		-
Corporate debt securities		292,586		-		292,586		-
Commercial paper		17,928		-		17,928		-
U.S. treasuries and government agency bonds		8,285		-		8,285		-
Auction-rate securities backed by student-loan notes		1,711		-		-		1,711
Mutual funds and money market funds under deferred compensation plan		43,933		43,933		-		-
Total	$	510,372	$	59,395	$	449,266	$	1,711

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Note 5 - Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	December 31,
	2023		2022
Raw materials	$	118,917	$	126,760
Work in process		112,750		134,071
Finished goods		152,035		186,459
Total	$	383,702	$	447,290

Schedule of Other Current Assets [Table Text Block]

	December 31,
	2023		2022
Other receivables	$	50,000	$	-
RSU tax withholding proceeds receivable		20,141		14,480
Prepaid expenses		28,964		11,045
Restricted cash		33,204		-
Other		15,154		17,217
Total	$	147,463	$	42,742

Property, Plant and Equipment [Table Text Block]

	December 31,
	2023			2022
Land	$	48,490		$	41,924
Production equipment and software		270,390			254,882
Buildings and improvements		205,132			195,205
Transportation equipment		28,641			28,612
Leasehold improvements		17,052			17,389
Furniture and fixtures		11,711			11,378
Construction in progress		16,980			1,908
Property and equipment, gross		598,396			551,298
Less: accumulated depreciation and amortization		(229,444	)		(194,141	)
Total	$	368,952		$	357,157

Schedule of Other Assets, Noncurrent [Table Text Block]

	December 31,
	2023		2022
Deferred compensation plan assets	$	78,381	$	63,022
Prepaid wafer purchases		120,000		170,000
Other		12,896		16,264
Total	$	211,277	$	249,286

Schedule of Accrued Liabilities [Table Text Block]

	December 31,
	2023		2022
Dividends and dividend equivalents	$	57,697	$	42,170
Warranty		16,906		24,082
Stock rotation and sales returns		18,843		14,931
Income tax payable		8,063		15,595
Other		14,282		16,901
Total	$	115,791	$	113,679

Other Noncurrent Liabilities [Table Text Block]

	December 31,
	2023		2022
Deferred compensation plan liabilities	$	80,903	$	64,863
Dividend equivalents		2,187		6,847
Operating lease liabilities		5,565		1,664
Total	$	88,655	$	73,374

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Note 6 - Leases (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Lessee, Operating Lease, Balance Sheet Information [Table Text Block]

		December 31,
	Financial Statement Line Item	2023		2022
Operating lease ROU assets	Other long-term assets	$	8,355	$	4,288
Operating lease liabilities	Other accrued liabilities	$	2,303	$	2,133
	Other long-term liabilities	$	5,565	$	1,664

Lease, Cost [Table Text Block]

	Year Ended December 31,
	2023		2022		2021
Lease costs:
Operating lease costs	$	3,113	$	2,704	$	2,454
Other		2,120		1,769		740
Total lease costs	$	5,233	$	4,473	$	3,194

	Year Ended December 31,
	2023		2022		2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	2,954	$	2,762	$	2,315
ROU assets obtained in exchange for new operating lease liabilities	$	7,081	$	1,175	$	5,195

	December 31,
	2023			2022
Weighted-average remaining lease term (in years)		4.7			2.1
Weighted-average discount rate		4.3	%		2.1	%

Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]

2024	$	2,583
2025		1,909
2026		1,230
2027		1,238
Thereafter		1,653
Total remaining lease payments		8,613
Less: imputed interest		(745	)
Total lease liabilities	$	7,868

Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block]

2024	$	760
2025		235
2026		41
Total	$	1,036

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Note 7 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

	Year Ended December 31,
	2023		2022		2021
Cost of revenue	$	4,545	$	4,721	$	3,543
Research and development		36,611		35,355		26,030
Selling, general and administrative		108,555		120,916		93,906
Total stock-based compensation expense	$	149,711	$	160,992	$	123,479
Tax benefit related to stock-based compensation (1)	$	2,519	$	2,498	$	1,760

Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	Time-Based RSUs					PSUs and MPSUs						MSUs					Total
	Number of Shares			Weighted-Average Grant Date Fair Value Per Share		Number of Shares				Weighted-Average Grant Date Fair Value Per Share		Number of Shares			Weighted-Average Grant Date Fair Value Per Share		Number of Shares			Weighted-Average Grant Date Fair Value Per Share
Outstanding at January 1, 2021		161		$	151.62		1,390			$	132.60		1,554		$	40.40		3,105		$	87.42
Granted		46		$	384.33		365		(1)	$	354.12		-		$	-		411		$	357.49
Vested		(71	)	$	144.46		(577	)		$	91.50		(324	)	$	23.57		(972	)	$	72.69
Forfeited		(11	)	$	207.04		(12	)		$	103.84		(12	)	$	68.48		(35	)	$	124.50
Outstanding at December 31, 2021		125		$	235.82		1,166			$	222.78		1,218		$	44.59		2,509		$	136.87
Granted		49		$	390.89		35		(1)(2)	$	385.80		917		$	199.63		1,001		$	215.63
Vested		(61	)	$	193.18		(452	)		$	147.78		(324	)	$	23.57		(837	)	$	103.02
Forfeited		(7	)	$	316.00		(1	)		$	377.86		(6	)	$	216.37		(14	)	$	275.47
Outstanding at December 31, 2022		106		$	327.13		748			$	275.70		1,805		$	126.57		2,659		$	176.50
Granted		51		$	472.38		281		(1)	$	449.38		31		$	330.95		363		$	444.86
Vested		(49	)	$	296.65		(543	)		$	257.24		(319	)	$	23.57		(911	)	$	177.54
Forfeited		(6	)	$	387.61		(4	)		$	315.19		(15	)	$	110.65		(25	)	$	209.23
Outstanding at December 31, 2023		102		$	411.11		482			$	397.77		1,502		$	152.89		2,086		$	222.04

Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

	Year Ended December 31,
	2023			2022			2021
Expected term (in years)		0.5			0.5			0.5
Expected volatility		53.3	%		50.6	%		43.2	%
Risk-free interest rate		5.3	%		1.9	%		0.1	%
Dividend yield		0.8	%		0.6	%		0.6	%

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Note 8 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Dividends Declared [Table Text Block]

	Year Ended December 31,
	2023		2022		2021
Dividend declared per share	$	4.00	$	3.00	$	2.40
Total amount	$	190,642	$	140,337	$	110,206

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Note 9 - Other Income (Expense), Net (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Other Nonoperating Income (Expense) [Table Text Block]

	Year Ended December 31,
	2023			2022			2021
Interest income	$	23,363		$	14,369		$	11,637
Amortization of discount (premium) on available-for-sale securities, net		5,277			(4,375	)		(4,674	)
Gain (loss) on deferred compensation plan investments		8,505			(6,600	)		4,563
Charitable contributions		(14,850	)		(5,900	)		(1,500	)
Gain on sale of equity investment		1,424			-			-
Other		386			658			(224	)
Total	$	24,105		$	(1,848	)	$	9,802

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Note 10 - Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended December 31,
	2023		2022		2021
Numerator:
Net income	$	427,374	$	437,672	$	242,023
Denominator:
Weighted-average outstanding shares - basic		47,610		46,727		45,851
Effect of dilutive securities		1,161		1,631		2,038
Weighted-average outstanding shares - diluted		48,771		48,358		47,889
Net income per share:
Basic	$	8.98	$	9.37	$	5.28
Diluted	$	8.76	$	9.05	$	5.05

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Note 11 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

	Year Ended December 31,
	2023			2022			2021
United States	$	(15,066	)	$	(30,190	)	$	(15,542	)
Foreign		520,907			555,127			287,761
Income before income taxes	$	505,841		$	524,937		$	272,219

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2023			2022			2021
Current:
Federal	$	61,064		$	95,176		$	24,955
State		4,257			12			35
Foreign		5,702			5,019			3,801
Deferred:
Federal		(1,705	)		(8,523	)		4,929
State		(744	)		-			-
Foreign		9,893			(4,419	)		(3,524	)
Income tax expense	$	78,467		$	87,265		$	30,196

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	2023			2022			2021
U.S. statutory federal tax rate		21.0	%		21.0	%		21.0	%
Foreign income at lower rates		(21.9	)		(22.8	)		(23.2	)
GILTI		13.5			16.0			11.4
Changes in valuation allowance		2.9			0.2			0.5
Stock-based compensation		2.2			2.8			1.6
Return to provision true-up adjustment		(2.0	)		-			(1.1	)
Tax credits, net of reserves		(1.1	)		(1.2	)		(0.5	)
State income taxes		-			(0.2	)		1.6
Other adjustments		0.9			0.8			(0.2	)
Effective tax rate		15.5	%		16.6	%		11.1	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2023			2022
Deferred tax assets:
Tax credits	$	37,518		$	32,037
Stock-based compensation		3,404			2,900
Deferred compensation		11,126			9,844
Net operating losses		12,115			9,000
Other expenses not currently deductible		7,755			8,891
Deferred tax assets, gross		71,918			62,672
Valuation allowance		(35,008	)		(20,321	)
Deferred tax assets, net of valuation allowance		36,910			42,351
Deferred tax liabilities:
Depreciation and amortization		(6,420	)		(5,927	)
Undistributed foreign earnings		(817	)		(358	)
Other expenses currently deductible		(1,619	)		(814	)
Deferred tax liabilities		(8,856	)		(7,099	)
Net deferred tax assets	$	28,054		$	35,252

Summary of Valuation Allowance [Table Text Block]

Period	Balance at Beginning of Period		Additions		Reductions			Balance at End of Period
Year ended December 31, 2021	$	18,190	$	1,560	$	(230	)	$	19,520
Year ended December 31, 2022	$	19,520	$	1,743	$	(942	)	$	20,321
Year ended December 31, 2023	$	20,321	$	15,405	$	(718	)	$	35,008

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

Balance as of January 1, 2021	$	33,499
Increase for tax position of current year		9,191
Decrease for tax position of prior year		(657	)
Decrease due to settlement with tax authorities		(54	)
Decrease due to lapse of statute of limitation		(458	)
Balance as of December 31, 2021		41,521
Increase for tax position of current year		10,965
Increase for tax position of prior year		247
Decrease due to settlement with tax authorities		(970	)
Decrease due to lapse of statute of limitation		(2,486	)
Balance as of December 31, 2022		49,277
Increase for tax position of current year		14,108
Increase for tax position of prior year		2,209
Decrease due to lapse of statute of limitation		(1,926	)
Decrease for tax positions of prior year		(1,008	)
Balance as of December 31, 2023	$	62,660

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Note 12 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Year Ended December 31,
	2023			2022			2021
Balance at beginning of period	$	24,082		$	20,989		$	6,895
Warranties issued		2,929			3,092			10,558
Repairs, replacement and refund		(2,708	)		(2,357	)		(1,770	)
Changes in liability for pre-existing warranties		(7,397	)		2,358			5,306
Balance at end of period	$	16,906		$	24,082		$	20,989

Contractual Obligation, Fiscal Year Maturity [Table Text Block]

2024	$	367,842
2025		298,958
2026		1,668
2027		31,266
Total	$	699,734

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Note 14 - Significant Customers (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Year Ended December 31,
Customer	2023			2022			2021
Distributor A		26	%		24	%		26	%
Distributor B		19	%		19	%		15	%
Distributor C		10	%		*			10	%

	December 31,
Customer		2023		2022
Distributor A		42	%	29	%
Distributor B		13	%	23	%
Distributor C		10	%	*

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Note 15 - Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Year Ended December 31,
Country or Region	2023		2022		2021
China	$	934,768	$	938,946	$	700,985
Taiwan		307,499		233,040		169,130
South Korea		169,867		189,478		93,027
Europe		132,620		145,584		85,201
United States		97,294		99,804		35,770
Japan		93,340		91,048		68,720
Southeast Asia		85,150		95,739		54,611
Other		534		509		354
Total	$	1,821,072	$	1,794,148	$	1,207,798

Revenue from External Customers by Products and Services [Table Text Block]

	Year Ended December 31,
Product Family	2023		2022		2021
DC to DC	$	1,718,623	$	1,696,594	$	1,147,329
Lighting Control		102,449		97,554		60,469
Total	$	1,821,072	$	1,794,148	$	1,207,798

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

	December 31,
Country	2023		2022		2021
China	$	184,685	$	200,508	$	211,973
United States		119,430		113,996		113,805
Taiwan		39,419		20,074		19,607
Other		25,418		22,579		17,577
Total	$	368,952	$	357,157	$	362,962

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Note 16 - Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Unrealized Losses on Available-for-Sale Securities			Foreign Currency Translation Adjustments			Total
Balance as of January 1, 2022	$	(1,063	)	$	16,943		$	15,880
Other comprehensive loss before reclassifications		(6,944	)		(32,293	)		(39,237	)
Amounts reclassified from accumulated other comprehensive loss		96			-			96
Tax effect		184			-			184
Net current period other comprehensive loss		(6,664	)		(32,293	)		(38,957	)
Balance as of December 31, 2022		(7,727	)		(15,350	)		(23,077	)
Other comprehensive income (loss) before reclassifications		6,896			(9,528	)		(2,632	)
Amounts reclassified from accumulated other comprehensive income		(1	)		-			(1	)
Tax effect		(1,352	)		-			(1,352	)
Net current period other comprehensive income (loss)		5,543			(9,528	)		(3,985	)
Balance as of December 31, 2023	$	(2,184	)	$	(24,878	)	$	(27,062	)

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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Gain (Loss), Foreign Currency Transaction, before Tax	$ 200	$ 500	$ (700)
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Minimum [Member]
Warranty Term (Year)	1 year
Maximum [Member]
Warranty Term (Year)	2 years
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	20 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	40 years
Computer Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Transportation Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Transportation Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	20 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years

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Note 1 - Summary of Significant Accounting Policies - Summary of Deferred Compensation Plan (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred compensation plan assets	$ 78,381	$ 63,022
Deferred compensation plan liabilities	81,287	64,981
Other Long-term Assets [Member]
Deferred compensation plan assets	78,381	63,022
Accrued Compensation and Related Benefits [Member]
Deferred compensation plan liabilities	384	118
Other Long-term Liabilities [Member]
Deferred compensation plan liabilities	80,903	64,863
Cash Surrender Value [Member]
Deferred compensation plan assets	23,545	19,089
Mutual Funds and Money Market Funds, Fair Value [Member]
Deferred compensation plan assets	$ 54,836	$ 43,933

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Note 2 - Revenue Recognition (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, after Allowance for Credit Loss, Current	$ 179,858	$ 182,714
Minimum [Member]
Contract with Customer, Payment Term (Day)	30 days
Maximum [Member]
Contract with Customer, Payment Term (Day)	90 days
Certain Customers in China [Member]
Contract with Customer, Payment Term Required Prior to Shipping Products (Week)	14 days
Certain Customers in China [Member] | Accrued Liabilities, Current [Member]
Contract with Customer, Liability, Current	$ 2,800	$ 3,600
Product [Member]
Percentage of Revenue	99.00%	98.00%	97.00%
Product Sales Through Distribution Arrangements [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	80.00%	83.00%	88.00%

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Note 3 - Cash, Cash Equivalents, Investments and Restricted Cash (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity Securities without Readily Determinable Fair Value, Amount			$ 5,400
Proceeds from Sale, Maturity and Collection of Investments	$ 7,400
Gain on Sale of Investments		$ 1,424	$ (0)	$ (0)
Other Income (Expense) [Member]
Gain on Sale of Investments	$ 1,400

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Note 3 - Cash, Cash Equivalents, Investments and Restricted Cash - Cash, Cash Equivalents, Short-term and Long-term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Cash	$ 392,329	$ 273,145
Money market funds	135,514	15,462
Certificates of deposit	127,123	130,467
Commercial paper	0	17,928
U.S. treasuries and government agency bonds	358,409	8,285
Total	1,109,043	739,584
Cash and cash equivalents	527,843	288,607
Short-term investments	580,633	449,266
Investment within other long-term assets	567	1,711
Corporate Debt Securities [Member]
Available-for-sale securities	95,101	292,586
Auction Rate Securities [Member]
Available-for-sale securities	$ 567	$ 1,711

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Note 3 - Cash, Cash Equivalents, Investments and Restricted Cash - Investment Maturity Classification (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Due in less than 1 year, Amortized cost	$ 398,670
Due in less than 1 year, fair value	397,884
Due in 1 - 5 years, Amortized cost	183,266
Due in 1 - 5 years, fair value	182,749
Due in greater than 5 years, Amortized cost	574
Due in greater than 5 years, fair value	567
Total, Amortized cost	582,510
Total, fair value	$ 581,200

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Note 3 - Cash, Cash Equivalents, Investments and Restricted Cash - Unrealized Gains and Losses on Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost	$ 718,024	$ 474,643
Total Fair Value	716,714	466,439
Unrealized Gains	331	18
Unrealized Losses	(1,641)	(8,222)
Money Market Funds [Member]
Amortized Cost	135,514	15,462
Total Fair Value	135,514	15,462
Unrealized Gains		0
Unrealized Losses		0
Certificates of Deposit [Member]
Amortized Cost	127,123	130,467
Total Fair Value	127,123	130,467
Unrealized Gains		0
Unrealized Losses		0
Corporate Debt Securities [Member]
Amortized Cost	96,636	300,529
Total Fair Value	95,101	292,586
Unrealized Gains	4	18
Unrealized Losses	(1,539)	(7,961)
US Government Agencies Short-Term Debt Securities [Member]
Amortized Cost	358,177	8,487
Total Fair Value	358,409	8,285
Unrealized Gains	327	0
Unrealized Losses	(95)	(202)
Commercial Paper [Member]
Amortized Cost		17,928
Total Fair Value		17,928
Unrealized Gains		0
Unrealized Losses		0
Auction Rate Securities [Member]
Amortized Cost	574	1,770
Total Fair Value	$ 567	1,711
Unrealized Gains		0
Unrealized Losses		$ (59)

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Note 3 - Cash, Cash Equivalents, Investments and Restricted Cash - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Continuous Unrealized Loss Position, Less than 12 Months	$ 118,391	$ 73,930
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(114)	(975)
Continuous Unrealized Loss Position, 12 Months or Longer	71,373	211,083
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,527)	(7,247)
Unrealized Loss Position, Total	189,764	285,013
Unrealized Loss Position, Accumulated Loss, Total	(1,641)	(8,222)
Corporate Debt Securities [Member]
Continuous Unrealized Loss Position, Less than 12 Months	20,792	72,943
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(19)	(973)
Continuous Unrealized Loss Position, 12 Months or Longer	70,806	202,074
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,520)	(6,988)
Unrealized Loss Position, Total	91,598	275,017
Unrealized Loss Position, Accumulated Loss, Total	(1,539)	(7,961)
US Treasury and Government Short-Term Debt Securities [Member]
Continuous Unrealized Loss Position, Less than 12 Months	97,599
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(95)
Continuous Unrealized Loss Position, 12 Months or Longer	0
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Unrealized Loss Position, Total	97,599
Unrealized Loss Position, Accumulated Loss, Total	(95)
US Government Agencies Short-Term Debt Securities [Member]
Continuous Unrealized Loss Position, Less than 12 Months		987
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(2)
Continuous Unrealized Loss Position, 12 Months or Longer		7,298
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(200)
Unrealized Loss Position, Total		8,285
Unrealized Loss Position, Accumulated Loss, Total		(202)
Auction Rate Securities [Member]
Continuous Unrealized Loss Position, Less than 12 Months	0	0
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Continuous Unrealized Loss Position, 12 Months or Longer	567	1,711
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(7)	(59)
Unrealized Loss Position, Total	567	1,711
Unrealized Loss Position, Accumulated Loss, Total	$ (7)	$ (59)

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Note 3 - Cash, Cash Equivalents, Investments and Restricted Cash - Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash and cash equivalents	$ 527,843	$ 288,607
Restricted cash included in other current assets	33,204	0
Restricted cash included in other long-term assets	134	122
Total cash, cash equivalents and restricted cash reported on the Consolidated Statements of Cash Flows	$ 561,181	$ 288,729	$ 189,389	$ 335,071

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Note 4 - Fair Value Measurements - Financial Assets and Liabilities, Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Total Fair Value	$ 716,714	$ 466,439
Assets, fair value	771,550	510,372
Fair Value, Inputs, Level 1 [Member]
Assets, fair value	190,350	59,395
Fair Value, Inputs, Level 2 [Member]
Assets, fair value	580,633	449,266
Fair Value, Inputs, Level 3 [Member]
Assets, fair value	567	1,711
Money Market Funds [Member]
Total Fair Value	135,514	15,462
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value	135,514	15,462
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	0	0
Certificates of Deposit [Member]
Total Fair Value	127,123	130,467
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value	0	0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value	127,123	130,467
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	0	0
Corporate Debt Securities [Member]
Total Fair Value	95,101	292,586
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value	95,101	292,586
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	0	0
US Government Agencies Short-Term Debt Securities [Member]
Total Fair Value	358,409	8,285
US Government Agencies Short-Term Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value	0	0
US Government Agencies Short-Term Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value	358,409	8,285
US Government Agencies Short-Term Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	0	0
Commercial Paper [Member]
Total Fair Value		17,928
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value		0
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value		17,928
Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value		0
Auction Rate Securities [Member]
Total Fair Value	567	1,711
Auction Rate Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value	0	0
Auction Rate Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value	0	0
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	567	1,711
Mutual Fund [Member]
Total Fair Value	54,836	43,933
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value	54,836	43,933
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value	0	0
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	$ 0	$ 0

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Note 5 - Balance Sheet Components (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Depreciation	$ 40.0	$ 36.8	$ 28.4

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Note 5 - Balance Sheet Components - Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Raw materials	$ 118,917	$ 126,760
Work in process	112,750	134,071
Finished goods	152,035	186,459
Total	$ 383,702	$ 447,290

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Note 5 - Balance Sheet Components - Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other receivables	$ 50,000	$ 0
RSU tax withholding proceeds receivable	20,141	14,480
Prepaid expenses	28,964	11,045
Restricted cash included in other current assets	33,204	0
Other	15,154	17,217
Total	$ 147,463	$ 42,742

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Note 5 - Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property and equipment	$ 598,396	$ 551,298
Less: accumulated depreciation and amortization	(229,444)	(194,141)
Total	368,952	357,157
Land [Member]
Property and equipment	48,490	41,924
Production Equipment and Software [Member]
Property and equipment	270,390	254,882
Building and Building Improvements [Member]
Property and equipment	205,132	195,205
Transportation Equipment [Member]
Property and equipment	28,641	28,612
Leasehold Improvements [Member]
Property and equipment	17,052	17,389
Furniture and Fixtures [Member]
Property and equipment	11,711	11,378
Construction in Progress [Member]
Property and equipment	$ 16,980	$ 1,908

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Note 5 - Balance Sheet Components - Other Long-term Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred compensation plan assets	$ 78,381	$ 63,022
Prepaid wafer purchases	120,000	170,000
Other	12,896	16,264
Total	$ 211,277	$ 249,286

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Note 5 - Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Dividends and dividend equivalents	$ 57,697	$ 42,170
Warranty	16,906	24,082
Stock rotation and sales returns	18,843	14,931
Income tax payable	8,063	15,595
Other	14,282	16,901
Total	$ 115,791	$ 113,679

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Note 5 - Balance Sheet Components - Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred compensation plan liabilities	$ 80,903	$ 64,863
Dividend equivalents	2,187	6,847
Operating lease liabilities	5,565	1,664
Total	$ 88,655	$ 73,374

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Note 6 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Operating Lease, Lease Not yet Commenced, Future Lease Obligations	$ 0
Operating Lease, Lease Income, Lease Payments	$ 1,500	$ 2,400	$ 2,200
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Lessor, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	7 years
Lessee, Operating Lease, Renewal Term (Year)	5 years
Lessor, Operating Lease, Remaining Lease Term (Year)	3 years
Lessor, Operating Lease, Renewal Term (Year)	5 years

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Note 6 - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Operating Lease, Liability, Noncurrent	$ 5,565	$ 1,664
Other Long-term Assets [Member]
Operating lease ROU assets	8,355	4,288
Other Accrued Liabilities [Member]
Operating lease liabilities	2,303	2,133
Other Long-term Liabilities [Member]
Operating Lease, Liability, Noncurrent	$ 5,565	$ 1,664

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Note 6 - Leases - Leases Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating lease costs	$ 3,113	$ 2,704	$ 2,454
Other	2,120	1,769	740
Total lease costs	5,233	4,473	3,194
Operating cash flows for operating leases	2,954	2,762	2,315
ROU assets obtained in exchange for new operating lease liabilities	$ 7,081	$ 1,175	$ 5,195
Weighted-average remaining lease term (in years) (Year)	4 years 8 months 12 days	2 years 1 month 6 days
Weighted-average discount rate	4.30%	2.10%

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Note 6 - Leases - Maturities of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2023 USD ($)
2024	$ 2,583
2025	1,909
2026	1,230
2027	1,238
Thereafter	1,653
Total remaining lease payments	8,613
Less: imputed interest	(745)
Accrued Liabilities and Other Long-term Liabilities [Member]
Total lease liabilities	$ 7,868

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Note 6 - Leases - Maturities of Income Related to Lease Payments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
2024	$ 760
2025	235
2026	41
Total	$ 1,036

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Note 7 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands			1 Months Ended									2 Months Ended	3 Months Ended	12 Months Ended
	Jun. 11, 2020 shares	Dec. 31, 2015 USD ($) shares	Apr. 30, 2023 shares	Feb. 28, 2023 USD ($) shares	Oct. 31, 2022 USD ($) $ / shares shares	Feb. 28, 2022 USD ($) $ / shares shares	Feb. 28, 2021 USD ($) $ / shares shares	Jul. 31, 2020 USD ($) $ / shares shares	Feb. 29, 2020 USD ($) $ / shares shares	Oct. 31, 2018 $ / shares shares	Dec. 31, 2013 $ / shares shares	Feb. 28, 2023	Mar. 31, 2022	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 shares	Dec. 31, 2019 USD ($) shares	Nov. 13, 2014 shares
Share Price (in dollars per share) | $ / shares						$ 393.16	$ 374.57							$ 630.78
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Excluding Option Exercised | $														$ 1,118	$ 5,358	$ 17,322
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)														363,000	1,001,000	411,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares														$ 444.86	$ 215.63	$ 357.49
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)														911,000	837,000	972,000
Share-based Payment Arrangement, Expense | $														$ 149,711	$ 160,992	$ 123,479
Proceeds from Stock Plans | $														7,568	5,877	4,670
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested | $														461,300	336,800	381,200
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $														1,300,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $														$ 232,600
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)														2 years
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Excluding Option Exercised | $														$ 1,100	$ 5,400	$ 17,300
Time-Based RSUs [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)														51,000	49,000	46,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares														$ 472.38	$ 390.89	$ 384.33
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)														49,000	61,000	71,000
Time-Based RSUs [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)														4 years
Time-Based RSUs [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)						1 year								1 year	1 year
PSU2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Price Per Share Payable Upon Vesting of Equity Instruments Other than Options (in dollars per share) | $ / shares														$ 30
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares														$ 467.62
Total number of performance conditions														4
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate														51.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate														3.90%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate														0.90%
PSU2023 [Member] | Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				69,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed						300.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed														200.00%
Maximum Stock Compensation Costs | $														$ 156,200
PSU2023 [Member] | Non-Executive Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				13,000
Maximum Stock Compensation Costs | $				$ 13,800
PSU2023 [Member] | Non-Executive Employees [Member] | Vesting First Quarter of 2025 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage												50.00%
PSU2023 [Member] | Non-Executive Employees [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed												200.00%
PSU2023 [Member] | Non-Executive Employees [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed												300.00%
PSU 2022 [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $					$ 102,800
Share-based Compensation Arrangement by Share-based Payment Award, Price Per Share Payable Upon Vesting of Equity Instruments Other than Options (in dollars per share) | $ / shares						$ 30
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares						$ 393.16
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate						44.60%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate						1.50%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate						0.80%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)						4 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions						10.30%
PSU 2022 [Member] | Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						81,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed						300.00%
PSU 2022 [Member] | Executive Officer [Member] | Vesting First Quarter of 2023 if Performance Conditions are Met [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage						50.00%
PSU 2022 [Member] | Non-Executive Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						14,000
Maximum Stock Compensation Costs | $						$ 142,700
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)													2 years
PSU 2022 [Member] | Non-Executive Employees [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed						200.00%
PSU 2020 [Member]
Share Price (in dollars per share) | $ / shares									$ 182.62
Share-based Compensation Arrangement by Share-based Payment Award, Price Per Share Payable Upon Vesting of Equity Instruments Other than Options (in dollars per share) | $ / shares									30
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares									$ 182.62
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate									33.60%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate									1.40%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate									1.10%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)									2 years
PSU 2020 [Member] | Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)									100,000							300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed									300.00%
Maximum Stock Compensation Costs | $									$ 51,100
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)									2 years
PSU 2020 [Member] | Executive Officer [Member] | Vesting First Quarter of 2022 if Performance Conditions are Met [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage									50.00%
PSU 2020 [Member] | Non-Executive Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)									30,000							71,000
Maximum Stock Compensation Costs | $						$ 11,100			$ 11,800
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)						2 years			2 years
PSU 2020 [Member] | Non-Executive Employees [Member] | Vesting First Quarter of 2021 if Performance Conditions are Met [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						29,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage						50.00%			50.00%
PSU 2020 [Member] | Non-Executive Employees [Member] | Annual or Quarterly Vesting of Awards Not Based on Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)						2 years			2 years
PSU 2020 [Member] | Non-Executive Employees [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed						200.00%			200.00%
PSU 2020 [Member] | Non-Executive Employees [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed						300.00%			300.00%
PSU 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Price Per Share Payable Upon Vesting of Equity Instruments Other than Options (in dollars per share) | $ / shares							30
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares							$ 374.57
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate							41.40%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate							0.30%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate							0.60%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)							4 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions							9.80%
PSU 2021 [Member] | Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							80,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed							300.00%
Maximum Stock Compensation Costs | $							$ 114,400
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)							2 years
PSU 2021 [Member] | Executive Officer [Member] | Vesting First Quarter of 2023 if Performance Conditions are Met [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							240,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage							50.00%
PSU 2021 [Member] | Non-Executive Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							14,000
Maximum Stock Compensation Costs | $							$ 11,900
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)							2 years
PSU 2021 [Member] | Non-Executive Employees [Member] | Vesting First Quarter of 2021 if Performance Conditions are Met [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							33,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage							50.00%
PSU 2021 [Member] | Non-Executive Employees [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed							200.00%
PSU 2021 [Member] | Non-Executive Employees [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed							300.00%
MPSUs 2020 [Member]
Share Price (in dollars per share) | $ / shares																$ 248.71
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed								500.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate																38.80%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate																0.20%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate																0.80%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)																4 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions																8.90%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets								5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)																	221,000
Share-based Payment Arrangement, Expense | $								$ 42,100
MPSUs 2020 [Member] | Vest on July, 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage								75.00%
MPSUs 2020 [Member] | Vest on July 20, 2024 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage								25.00%
MPSUs 2020 [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award, Stock Price Target (in dollars per share) | $ / shares								$ 260
MPSUs 2020 [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award, Stock Price Target (in dollars per share) | $ / shares								$ 300
MPSUs 2020 [Member] | Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)								43,000
MPSUs 2020 [Member] | Key Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)								2,000
MSUs 2022 [Member]
Share Price (in dollars per share) | $ / shares					$ 342.16	$ 393.16
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					159,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed					500.00%	500.00%
Maximum Stock Compensation Costs | $					$ 119,200	$ 30,100								$ 124,300
Total number of performance conditions						6
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate					54.00%	39.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate					4.40%	1.70%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate					0.90%	0.80%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)					3 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets						5
Share-Based Payment Arrangement, Plan Modification, Incremental Cost | $					$ 21,500
MSUs 2022 [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets					5
MSUs 2022 [Member] | Minimum [Member]
Market Awards Price Targets (in dollars per share) | $ / shares					$ 455	$ 472
MSUs 2022 [Member] | Maximum [Member]
Market Awards Price Targets (in dollars per share) | $ / shares					$ 591	$ 590
MSUs 2022 [Member] | Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						24,000
MSUs 2018 [Member]
Share Price (in dollars per share) | $ / shares										$ 108.43
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)																		600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed										500.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate										31.60%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate										3.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions										8.70%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets										5
Share-based Payment Arrangement, Expense | $																		$ 38,500
Share-based Compensation Arrangement by Share-based Payment Award, Post-Award Vesting Period, Restriction Period on Sales (Year)										2 years
MSUs 2018 [Member] | Minimum [Member]
Market Awards Price Targets (in dollars per share) | $ / shares										$ 140
MSUs 2018 [Member] | Maximum [Member]
Market Awards Price Targets (in dollars per share) | $ / shares										$ 172
MSUs 2018 [Member] | Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)										60,000
MSUs 2018 [Member] | Non-Executive Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)										60,000
2013 MSU's [Member]
Share Price (in dollars per share) | $ / shares											$ 31.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed											500.00%
Maximum Stock Compensation Costs | $		$ 38,100
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate											38.70%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate											1.60%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions											0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets											5
Total MSUs Earned (in shares)		1,800,000
2013 MSU's [Member] | Minimum [Member]
Market Awards Price Targets (in dollars per share) | $ / shares											$ 40
2013 MSU's [Member] | Maximum [Member]
Market Awards Price Targets (in dollars per share) | $ / shares											$ 56
2013 MSU's [Member] | Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)											276,000
2013 MSU's [Member] | Non-Executive Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)											84,000
The2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)																			5,500,000
Amended and Restated 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)	10,500,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)														4,200,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)			4,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Automatic Increase Shares (in shares)			1,000,000
Share-basedCompensation Arrangement by Share-based Payment Award, Other Than Options, Percent Increases in Period			2.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee (in shares)														2,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares per Employee Value (in shares)														25,000
The 2004 Employee Stock Purchase Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)														4,400,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $														$ 400
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)														17,000	14,000	17,000
Employee Stock Purchase Plan Shares Issued, Intrinsic Value | $														$ 1,400	$ 1,600	$ 2,400
Proceeds from Stock Plans | $														$ 7,600	$ 5,900	$ 4,700

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Note 7 - Stock-based Compensation - Stock-based Compensation Plan Expenses (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share based compensation expense		$ 149,711	$ 160,992	$ 123,479
Tax benefit related to stock-based compensation	[1]	2,519	2,498	1,760
Cost of Sales [Member]
Share based compensation expense		4,545	4,721	3,543
Research and Development Expense [Member]
Share based compensation expense		36,611	35,355	26,030
Selling, General and Administrative Expenses [Member]
Share based compensation expense		$ 108,555	$ 120,916	$ 93,906

[1] Amount reflects the tax benefit related to stock-based compensation recorded for equity awards that are expected to generate tax deductions when they vest in future periods. Equity awards granted to the Company’s executive officers are subject to the tax deduction limitations set by Section 162(m) of the Internal Revenue Code.

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Note 7 - Stock-based Compensation - RSU Summary (Details) - $ / shares		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Balance (in shares)		2,659,000	2,509,000		3,105,000
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share)		$ 176.5	$ 136.87		$ 87.42
Granted (in shares)		363,000	1,001,000		411,000
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share)		$ 444.86	$ 215.63		$ 357.49
Vested (in shares)		(911,000)	(837,000)		(972,000)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share)		$ 177.54	$ 103.02		$ 72.69
Forfeited (in shares)		(25,000)	(14,000)		(35,000)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share)		$ 209.23	$ 275.47		$ 124.5
Balance (in shares)		2,086,000	2,659,000		2,509,000
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share)		$ 222.04	$ 176.5		$ 136.87
Time-Based RSUs [Member]
Balance (in shares)		106,000	125,000		161,000
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share)		$ 327.13	$ 235.82		$ 151.62
Granted (in shares)		51,000	49,000		46,000
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share)		$ 472.38	$ 390.89		$ 384.33
Vested (in shares)		(49,000)	(61,000)		(71,000)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share)		$ 296.65	$ 193.18		$ 144.46
Forfeited (in shares)		(6,000)	(7,000)		(11,000)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share)		$ 387.61	$ 316		$ 207.04
Balance (in shares)		102,000	106,000		125,000
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share)		$ 411.11	$ 327.13		$ 235.82
PSUs and MPSUs [Member]
Balance (in shares)		748,000	1,166,000		1,390,000
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share)		$ 275.7	$ 222.78		$ 132.6
Granted (in shares)	[1]	281,000	35,000	[2]	365,000
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share)		$ 449.38	$ 385.8		$ 354.12
Vested (in shares)		(543,000)	(452,000)		(577,000)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share)		$ 257.24	$ 147.78		$ 91.5
Forfeited (in shares)		(4,000)	(1,000)		(12,000)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share)		$ 315.19	$ 377.86		$ 103.84
Balance (in shares)		482,000	748,000		1,166,000
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share)		$ 397.77	$ 275.7		$ 222.78
MSUs [Member]
Balance (in shares)		1,805,000	1,218,000		1,554,000
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share)		$ 126.57	$ 44.59		$ 40.4
Granted (in shares)		31,000	917,000		0
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share)		$ 330.95	$ 199.63		$ 0
Vested (in shares)		(319,000)	(324,000)		(324,000)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share)		$ 23.57	$ 23.57		$ 23.57
Forfeited (in shares)		(15,000)	(6,000)		(12,000)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share)		$ 110.65	$ 216.37		$ 68.48
Balance (in shares)		1,502,000	1,805,000		1,218,000
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share)		$ 152.89	$ 126.57		$ 44.59

[1] Amount reflects the number of awards that may ultimately be earned based on management’s probability assessment of the achievement of performance conditions at each reporting period.

[2] Amount included grants and cancellations of the 2022 Executive PSUs as defined under the "2022 PSUs" section.

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Note 7 - Stock-based Compensation - Valuation Assumptions (Details) - 2004 Employee Stock Plan [Member] - Employee Stock Purchase Plan [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Expected term (Year)	6 months	6 months	6 months
Expected volatility	53.30%	50.60%	43.20%
Risk-free interest rate	5.30%	1.90%	0.10%
Dividend yield	0.80%	0.60%	0.60%

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Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Oct. 31, 2023	Dec. 31, 2022
Dividends Payable, Current	$ 47,900		$ 35,300
Accrued Dividend Equivalents	$ 11,900		$ 13,800
Stock Repurchased and Retired During Period, Shares (in shares)	7,000
Stock Repurchased and Retired During Period, Value	$ 3,741
Maximum [Member]
Stock Repurchase Program, Authorized Amount		$ 640,000

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Note 8 - Stockholders' Equity - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Dividend declared per share (in dollars per share)	$ 1	$ 4	$ 3	$ 2.4
Total amount		$ 190,642	$ 140,337	$ 110,206

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Note 9 - Other Income (Expense), Net - Interest and Other Income Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income	$ 23,363	$ 14,369	$ 11,637
Amortization of discount (premium) on available-for-sale securities, net	5,277	(4,375)	(4,674)
Gain (loss) on deferred compensation plan investments	8,505	(6,600)	4,563
Charitable contributions	(14,850)	(5,900)	(1,500)
Gain on sale of equity investment	1,424	(0)	(0)
Other	386	658	(224)
Total	$ 24,105	$ (1,848)	$ 9,802

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Note 10 - Net Income Per Share - Net Income Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 427,374	$ 437,672	$ 242,023
Weighted-average outstanding shares - basic (in shares)	47,610	46,727	45,851
Effect of dilutive securities (in shares)	1,161	1,631	2,038
Weighted-average outstanding shares - diluted (in shares)	48,771	48,358	47,889
Earnings per share, basic (in dollars per share)	$ 8.98	$ 9.37	$ 5.28
Earnings per share, diluted (in dollars per share)	$ 8.76	$ 9.05	$ 5.05

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Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Undistributed Earnings of Foreign Subsidiaries	$ 85,000	$ 67,400
Unrecognized Tax Benefits	62,660	49,277	$ 41,521	$ 33,499
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	48,900	38,300
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	5,700	4,300
Domestic Tax Authority [Member]
Operating Loss Carryforwards	0
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	3,600
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	40,600
Foreign Tax Authority [Member]
Operating Loss Carryforwards	92,700
Bermuda Subsidiary [Member]
Foreign Earnings Repatriated	$ 140,000	$ 0	$ 70,000

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Note 11 - Income Taxes - Components of Income Before Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
United States	$ (15,066)	$ (30,190)	$ (15,542)
Foreign	520,907	555,127	287,761
Income before income taxes	$ 505,841	$ 524,937	$ 272,219

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Note 11 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal	$ 61,064	$ 95,176	$ 24,955
State	4,257	12	35
Foreign	5,702	5,019	3,801
Federal	(1,705)	(8,523)	4,929
State	(744)	0	0
Foreign	9,893	(4,419)	(3,524)
Income tax expense	$ 78,467	$ 87,265	$ 30,196

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Note 11 - Income Taxes - Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
U.S. statutory federal tax rate	21.00%	21.00%	21.00%
Foreign income at lower rates	(21.90%)	(22.80%)	(23.20%)
GILTI	13.50%	16.00%	11.40%
Changes in valuation allowance	2.90%	0.20%	0.50%
Stock-based compensation	2.20%	2.80%	1.60%
Return to provision true-up adjustment	(2.00%)	0.00%	(1.10%)
Tax credits, net of reserves	(1.10%)	(1.20%)	(0.50%)
State income taxes	0.00%	(0.20%)	1.60%
Other adjustments	0.90%	0.80%	(0.20%)
Effective tax rate	15.50%	16.60%	11.10%

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Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Tax credits	$ 37,518	$ 32,037
Stock-based compensation	3,404	2,900
Deferred compensation	11,126	9,844
Net operating losses	12,115	9,000
Other expenses not currently deductible	7,755	8,891
Deferred tax assets, gross	71,918	62,672
Valuation allowance	(35,008)	(20,321)
Deferred tax assets, net of valuation allowance	36,910	42,351
Depreciation and amortization	(6,420)	(5,927)
Undistributed foreign earnings	(817)	(358)
Other expenses currently deductible	(1,619)	(814)
Deferred tax liabilities	(8,856)	(7,099)
Net deferred tax assets	$ 28,054	$ 35,252

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Note 11 - Income Taxes - Reconciliation of Valuation Allowances (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance	$ 20,321	$ 19,520	$ 18,190
Addition	15,405	1,743	1,560
Reduction	(718)	(942)	(230)
Balance	$ 35,008	$ 20,321	$ 19,520

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Note 11 - Income Taxes - Unrecognized Tax Benefits Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance	$ 49,277	$ 41,521	$ 33,499
Increase for tax position of current year	14,108	10,965	9,191
Decrease for tax position of prior year	(1,008)		(657)
Decrease due to settlement with tax authorities		(970)	(54)
Decrease due to lapse of statute of limitation	(1,926)	(2,486)	(458)
Increase for tax position of prior year	2,209	247
Balance	$ 62,660	$ 49,277	$ 41,521

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Note 12 - Commitments and Contingencies (Details Textual) $ in Thousands	Dec. 31, 2023 USD ($)
Purchase Obligation	$ 699,734
Long-term Supply Agreement [Member]
Purchase Obligation	$ 120,000

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Note 12 - Commitments and Contingencies - Changes in Warranty Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance	$ 24,082	$ 20,989	$ 6,895
Warranties issued	2,929	3,092	10,558
Repairs, replacement and refund	(2,708)	(2,357)	(1,770)
Changes in liability for pre-existing warranties	(7,397)	2,358	5,306
Balance	$ 16,906	$ 24,082	$ 20,989

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Note 12 - Commitments and Contingencies - Estimated Future Unconditional Purchase Commitments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
2024	$ 367,842
2025	298,958
2026	1,668
2027	31,266
Total	$ 699,734

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Note 13 - Employee 401(k) Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0	$ 0	$ 0

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Note 14 - Segment, Significant Customers and Geographic Information - Customers with Sales and Accounts Receivable Greater Than 10% (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue Benchmark [Member] | Distributor A [Member]
Concentration risk	26.00%	24.00%	26.00%
Revenue Benchmark [Member] | Distributor B [Member]
Concentration risk	19.00%	19.00%	15.00%
Revenue Benchmark [Member] | Distributor C [Member]
Concentration risk	10.00%		10.00%
Accounts Receivable [Member] | Distributor A [Member]
Concentration risk	42.00%	29.00%
Accounts Receivable [Member] | Distributor B [Member]
Concentration risk	13.00%	23.00%
Accounts Receivable [Member] | Distributor C [Member]
Concentration risk	10.00%

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Note 15 - Segment and Geographic Information (Details Textual)	12 Months Ended
	Dec. 31, 2023
Number of Reportable Segments	1

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Note 15 - Segment and Geographic Information - Revenue By Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue	$ 1,821,072	$ 1,794,148	$ 1,207,798
CHINA
Revenue	934,768	938,946	700,985
TAIWAN
Revenue	307,499	233,040	169,130
KOREA, REPUBLIC OF
Revenue	169,867	189,478	93,027
Europe [Member]
Revenue	132,620	145,584	85,201
UNITED STATES
Revenue	97,294	99,804	35,770
JAPAN
Revenue	93,340	91,048	68,720
South East Asia [Member]
Revenue	85,150	95,739	54,611
Other Region [Member]
Revenue	$ 534	$ 509	$ 354

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Note 15 - Segment and Geographic Information - Revenue By Product Family (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue	$ 1,821,072	$ 1,794,148	$ 1,207,798
DC To DC Products [Member]
Revenue	1,718,623	1,696,594	1,147,329
Lighting Control Products [Member]
Revenue	$ 102,449	$ 97,554	$ 60,469

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Note 15 - Segment and Geographic Information - Long Lived Assets By Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Long lived assets by region	$ 368,952	$ 357,157	$ 362,962
CHINA
Long lived assets by region	184,685	200,508	211,973
UNITED STATES
Long lived assets by region	119,430	113,996	113,805
TAIWAN
Long lived assets by region	39,419	20,074	19,607
Other Region [Member]
Long lived assets by region	$ 25,418	$ 22,579	$ 17,577

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Note 16 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 1,668,602	$ 1,243,985
Balance	2,049,939	1,668,602
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(7,727)	(1,063)
Other comprehensive loss before reclassifications	6,896	(6,944)
Amounts reclassified from accumulated other comprehensive loss	(1)	96
Tax effect	(1,352)	184
Net current period other comprehensive loss	5,543	(6,664)
Balance	(2,184)	(7,727)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(15,350)	16,943
Other comprehensive loss before reclassifications	(9,528)	(32,293)
Amounts reclassified from accumulated other comprehensive loss	0	0
Tax effect	0	0
Net current period other comprehensive loss	(9,528)	(32,293)
Balance	(24,878)	(15,350)
AOCI Attributable to Parent [Member]
Balance	(23,077)	15,880
Other comprehensive loss before reclassifications	(2,632)	(39,237)
Amounts reclassified from accumulated other comprehensive loss	(1)	96
Tax effect	(1,352)	184
Net current period other comprehensive loss	(3,985)	(38,957)
Balance	$ (27,062)	$ (23,077)

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Note 17 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 29, 2024	Jan. 31, 2024	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Common Stock, Dividends, Per Share, Declared (in dollars per share)			$ 1	$ 4	$ 3	$ 2.4
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 1.25
Axign [Member] | Subsequent Event [Member]
Business Combination, Consideration Transferred		$ 33.8