Monolithic Power Systems 2025 10-K Annual Report

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

For the fiscal year ended December 31, 2025

or

Commission file number: 000-51026

Monolithic Power Systems, Inc.

(Exact name of registrant as specified in its charter)

(561) 839-3999

(Registrant’s telephone number, including area code)

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

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 ☐

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.

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, 2025, was $ 24.7 billion (2).

There were 49,118,000 shares of the registrant’s common stock issued and outstanding as of February 20, 2026.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Proxy Statement for the 2026 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, 2025.

Explanatory Note

Restatement of Previously Issued Consolidated Financial Statements

On February 26, 2026, the Audit Committee of the Board of Directors of Monolithic Power Systems, Inc. (the “Company”), after discussion with senior management and the Company’s independent registered public accountants, determined that the Company’s previously issued audited consolidated financial statements included in its annual report on Form 10-K for the fiscal year ended December 31, 2024, filed on March 3, 2025, and each of the Company’s previously issued unaudited condensed consolidated financial statements included in its quarterly reports on Form 10-Q for each of the quarterly periods in 2025 (each a “Previous Filing” and collectively “Previous Filings”), should no longer be relied upon due to the impact of an unintentional error.

The required restatement was discovered in connection with the preparation of this Annual Report on Form 10-K for the fiscal year ended December 31, 2025. The Company engaged third-party tax service providers in connection with the original determination of the accounting for deferred income taxes associated with a one-time tax incentive granted by a certain foreign jurisdiction. Nevertheless, the Company concluded that in the prior year it had not appropriately accounted for the deferred income taxes associated with the tax incentive. The restatement results in a decrease to income tax benefit, net and net deferred income taxes by $194.6 million in the consolidated financial statements as of and for the year ended December 31, 2024.

This Annual Report on Form 10-K includes restated Consolidated Financial Statements as of and for the years ended December 31, 2024. In addition, the Company has restated its unaudited quarterly Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Operations, Condensed Consolidated Statements of Comprehensive Income, and Condensed Consolidated Statements of Stockholders’ Equity for each of the quarters in the year ended December 31, 2025.

Comparative amounts in 2025 presented in the Company’s Quarterly Reports on Form 10-Q for the periods ending March 31, 2026, June 30, 2026 and September 30, 2026 will be changed retrospectively to reflect the restatement. Accordingly, investors should rely only on the financial information and other disclosures regarding the restated periods in this Form 10-K or in future filings with the Securities and Exchange Commission (as applicable), and not on any Previous Filings, earnings releases or similar communications relating to the restated periods.

Refer to Note 2, Restatement of Previously Issued Consolidated Financial Statements and Note 17, Restatement of Previously Issued Condensed Consolidated Financial Statements (unaudited) in the accompanying Consolidated Financial Statements included in Part II, Item 8 for additional information, including the impact on the specific accounts.

Items Restated in this Form 10-K

Part II, Item 8. Financial Statements and Supplementary Data has been restated, as appropriate, to correct the error noted above.

MONOLITHIC POWER SYSTEMS, INC.

FORM 10-K

FOR THE FISCAL YEAR ENDED December 31, 2025

TABLE OF CONTENTS

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:

These forward-looking statements generally are identified by the words “would,” “could,” “may,” “should,” “predict,” “potential,” “targets,” “continue,” “anticipate,” “expect,” “intend,” “plan,” “believe,” “seek,” “estimate,” “project,” “forecast,” “will,” and similar expressions. 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, global economic uncertainties, including tariffs, export controls and retaliatory measures, and geopolitical tensions 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 Current Reports on Form 8-K.

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

PART I

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General

Monolithic Power Systems, Inc. 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 and more reliable 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 new, innovative products that expand our market.

We have over 4,500 employees worldwide, with various locations in Asia, Europe and the U.S.

Industry and Product 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 applications to digital systems.

We focus on the market for high performance analog and mixed-signal solutions. High performance products generally are differentiated by functionality and performance factors, which include integration of higher levels of functionality into a single chip or module, 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 allow us to operate at 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, communications, consumer, and industrial end markets. Storage and computing was our largest end market in 2025, closely followed by enterprise data. The following table is a summary of the various key end market applications for our products, and those markets’ contribution as a percentage of our total revenue for the periods presented:

Product Families

Our proprietary process and packaging technologies enable us to design and deliver smaller, single-chip power management solutions. These technologies simplify the design process and are applicable across a wide range of analog applications within the storage and computing, enterprise data, automotive, communications, consumer, and industrial end markets.

Our key product families include, but are not limited to, the Direct Current (“DC”) to DC, Alternating Current (“AC”) to DC, driver metal-oxide-semiconductor field-effect transistor, power management IC, current limit switch and lighting control products.

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. For example, DC to DC solutions are used to convert and control voltages within a broad range of electronic systems, such as cloud-based and on-premises CPU servers and workstations, AI systems, memory, storage solutions, notebooks, infotainment, power sources, home appliances, network infrastructure and satellite communications. We believe 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.

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 in a diversified way across regions, expand our customer base and continue to secure manufacturing capacity.

Customers, Sales and Marketing

We have sales offices in various locations in Asia, Europe and the U.S. 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 engineering efforts, we then sell our products to end customers primarily through third-party distributors and value-added resellers. 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. Our resellers may second source other products and provide other services to customers.

In 2025, three distributors accounted for 26%, 18% and 10% of our total revenue. In 2024, two distributors accounted for 31% and 20% of our total revenue. In 2023, three distributors accounted for 26%, 19% and 10% of our total revenue. No other direct 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 of them has the non-exclusive right to sell and shall use its best efforts to promote and develop our products in various markets. 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 worldwide sales are primarily billed and payable in U.S. dollars, the reporting of our sales is not subject to fluctuating currency exchange rates. However, because a majority of our revenue is attributable to sales to customers in Asia, increases in the relative value of the dollar may create pricing pressures for our products. Our revenue from sales to customers in Asia was 92%, 94% and 87% of our total revenue for the years ended December 31, 2025, 2024 and 2023, respectively.

Our sales are made primarily pursuant to standard individual purchase orders. Our backlog consists of orders that we have received from customers that have not yet shipped. Because orders in backlog may be 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 may not necessarily be 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, any 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.

Research and Development

We have assembled a qualified team of engineers in various locations in Asia, Europe and the U.S. 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, packaging and solution development, 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 and packaging 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 and packaging technologies, we are investing in research and development resources to provide leading-edge analog power processes for our next generation of ICs, as well as innovative packaging technologies for integrated solutions. 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, 2025, we had 2,231 patents/applications issued or pending, of which 654 patents have been issued in the U.S. Our issued patents are scheduled to expire at various times through December 2045. 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 U.S. 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.

Manufacturing

We utilize a fabless business model, working with third parties to manufacture, assemble and test 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 equipment in their facilities for use on our behalf. This close collaboration and control over the manufacturing process have historically resulted in favorable yields and product performance for our ICs.

We maintain a diversified and adaptable supply chain. 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 facilities in China, Taiwan, Singapore, Malaysia and South Korea 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, Malaysia and South Korea. The assembled ICs are then sent for final testing to facilities in China, Taiwan, Singapore, Malaysia and South Korea 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. In addition, diversifying our manufacturing footprint across multiple countries helps mitigate operational risks and enhances our ability to adapt and maintain continuity.

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, our ability to maintain the rate at which we introduce these new products, and our ability to meet our end 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. In some cases, our competitors 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. 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 because our ICs and solutions are typically smaller in size, are highly integrated with lower energy consumption, and achieve higher performance specifications 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 introduced by existing competitors or new companies entering our markets. In addition, there has historically been a high level of consolidation in the semiconductor industry. If these or future acquisitions are successful, competition may intensify, as our competitors add resources with which 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 allow us to operate at above average industry performance levels over the long term.

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 and research and development. We believe that our operations and facilities comply in all material respects with applicable environmental laws and worker health and safety laws.

We and our supply chain, including the end products which contain our products, are also subject to import/export controls, tariffs, and other trade-related regulations and restrictions in the countries in which we, our supply chain or the providers of such end products, have operations or otherwise do business. Government regulations and import/export controls can be complex and are subject to change in the future, in some cases unexpectedly, and accordingly, we are unable to assess the possible effect on our business and financial results of compliance with future requirements. Our efforts to comply with these government regulations could have material impacts on our capital expenditures, operating expenses, revenue, margins, resource allocation, operations, competitive position, or financial condition, and 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.

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, 2025, we employed 4,501 employees in various locations in Asia, Europe and the U.S., compared with 4,017 employees as of December 31, 2024. Certain employees are subject to collective bargaining agreements. 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 a broad range of skill sets and experience, a healthy and safe environment, and professional growth opportunities:

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 certain corporate documents and policies, including 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 the 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 27, 2026 is as follows:

Michael Hsing founded MPS in 1997 and currently serves as our President, Chief Executive Officer, Chairman of the Board of Directors. 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. In 2004, Mr. Hsing took the company through its IPO. Under his leadership, we are constantly creating cutting-edge products to improve the quality of life with green, easy-to-use systems solutions.

Bernie Blegen currently serves as Executive Vice President and Chief Financial Officer. He 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 March 2016, Mr. Blegen served as our Corporate Controller, and from March 2016 to July 2016, as our interim Chief Financial Officer. Mr. Blegen joined us with more than 25 years of experience in corporate strategy, mergers and acquisitions, tax, finance and accounting in the semiconductor, software and publishing industries. Prior to joining us, 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 currently serves as our Executive Vice President of Global Operations. He served as our President of Asia Operations since January 2008. Since joining us in May 2001, Mr. Xiao held several executive positions, including Foundry Manager and Senior Vice President of Operations. Before joining us, from June 2000 to May 2001, Mr. Xiao was Engineering Account Manager at Chartered Semiconductor Manufacturing, Inc. Prior to that, Mr. Xiao spent 6 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 currently serves as our Executive Vice President of Worldwide Sales and Marketing. Mr. Sciammas joined us in July 1999 and served as Senior Vice President of Worldwide Sales and Marketing until he was appointed to his current position. Before joining us, 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 currently serves as Executive Vice President, Strategic Corporate Development, General Counsel and Corporate Secretary. She 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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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 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 include those related to 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:

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

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Cybersecurity Risk Management and Strategy

We recognize it is 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 operations and programs through a diversified approach including threat-monitoring and assessments by third-parties, adopting IT security ISO standards/governance, and 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 new technologies and existing and emerging laws and regulations related to data protection and information security and implement changes that help to mitigate risk. 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. To date, we do not believe we have experienced any material information security breaches and have not incurred significant operating expenses related to information security breaches.

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 on our cybersecurity risk management and strategy programs to the Board of Directors on a quarterly basis.

The Cybersecurity Steering Committee includes individuals with an average of over 20 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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As of December 31, 2025, our owned and leased facilities in the U.S. and other countries that are individually in excess of 10,000 square feet consisted of:

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

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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 are also 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. Based on current information and management assessment, we do not believe that a material loss from known matters is probable as of December 31, 2025.

On February 4, 2025, a class action lawsuit was filed against us and certain of our executives. The lawsuit is captioned Waterford Twp. Gen. Emps. Ret. Sys. v. Monolithic Power Systems, Inc., et al., No. 25-cv-220 (W.D. Wash.) (the “Securities Action”) and alleges that we violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 promulgated thereunder, by making material misstatements or omissions relating to our business. We believe the lawsuit is meritless and currently intend to defend against it vigorously. Related to the Securities Action, two shareholder derivative suits were also filed, against current – and one former – director, and certain executives, alleging breaches of their fiduciary duties. The shareholder derivative suits have been consolidated under the caption Miller v. Hsing, et al., No. 25-cv-527 (W.D. Wash.), filed on March 26, 2025 (the “Derivative Litigation”). The Securities Action and Derivative Litigation seek unspecified amounts of damages and/or attorneys’ fees and other relief. The Derivative Litigation is stayed pending developments in the Securities Action.

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Not applicable.

PART II

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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 20, 2026, there were 91 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 February 2025, our Board of Directors approved a stock repurchase program authorizing us to repurchase up to $500.0 million of our common stock through February 2028. Shares are retired upon repurchase. We repurchased approximately 8,000 shares of our common stock for an aggregate purchase price of $6.6 million during the year ended December 31, 2025.

The following table represents details of our stock repurchase transactions during the three months ended December 31, 2025:

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 shares 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.

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.

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, 2020, and its performance relative to the performance of the same investment in the two indexes is shown through December 31, 2025, 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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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 contains, 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 2023 results and year-to-year comparisons between 2024 and 2023 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, 2024, filed with the SEC on March 3, 2025.

Overview

We are a fabless global company that provides high-performance, semiconductor-based power electronics solutions. Our 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, we have 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 us 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 allow us to operate at above average industry performance levels over the long term.

We work with third parties to manufacture, assemble and test 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 incurring a significant penalty, make the forecasting of our orders, revenue and expenses 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 sales to customers in Asia was 92%, 94% and 87% for the years ended December 31, 2025, 2024 and 2023, respectively. We believe our ability to achieve revenue growth will depend, in part, on our ability to develop new products, enter new markets, gain market share, manage litigation risk, diversify our customer base and continue to secure manufacturing capacity.

Macroeconomic Conditions and Regulations

The semiconductor industry is impacted by various macroeconomic challenges including fluctuations in consumer spending, fluctuations in demand for semiconductors, rising inflation, global tariffs and retaliatory measures and announcements regarding the same, increased interest rates, and fluctuations in currency rates. We remain cautious in light of continued challenging global 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, tariffs, trade regulations and other trade requirements. For the year ended December 31, 2025 and through the date we filed this Annual Report, no restrictions or requirements have had a material impact on our revenue and operations. We believe that our diverse, agile and resilient supply chain is structured in a way to minimize the impact of tariffs; however, such restrictions or requirements can be enacted quickly and unexpectedly and could impact our business in the future. To the extent tariffs, trade regulations or retaliatory measures or announcements regarding the same that affect us are implemented, we will seek to take mitigating actions in the near- and medium-term, as necessary, but there can be no assurance we will be successful. We are committed to complying with all applicable trade laws, regulations and other requirements.

Critical Accounting 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 U.S. generally accepted accounting principles (“U.S. 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 income taxes valuation allowances and stock-based compensation. 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. These factors include demand for our products, economic conditions and other current and future events, such as macroeconomic factors, global economic uncertainties, current and potential global conflicts and global tariffs, export controls and retaliatory measures and announcements regarding the same. 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 estimates reflect our significant judgments used in the preparation of our consolidated financial statements.

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 both December 31, 2025 and 2024, we had a valuation allowance of $3.6 billion attributable to management’s determination that it is more likely than not that certain deferred tax assets will not be fully realized. In 2024, one of the Company’s foreign subsidiaries was granted a ten-year tax incentive, beginning in tax year 2025. 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 is 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. For example, a change in forecasted income could impact the expected utilization of our tax incentive and result in an income tax benefit or additional income tax expense in our financial statements in the period such determination is made.

Stock-Based Compensation

For equity awards with 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 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 a recent accounting pronouncement not yet adopted as of December 31, 2025.

Results of Operations

The following table summarizes our results of operations for the periods presented:

Revenue

The following table summarizes our revenue by end market for the periods presented:

Revenue for the full year ended December 31, 2025 was $2.8 billion, an increase of $583.4 million, or 26.4%, from $2.2 billion for the year ended December 31, 2024. The increase in revenue was primarily due to increases in shipment volume.

By end market, full year 2025 revenue for storage and computing of $732.5 million increased $230.9 million, or 46.0%, from the same period in 2024. This increase was primarily driven by increased sales of power solutions for memory, storage, notebooks and graphic cards. Revenue from the enterprise data market decreased $14.4 million, or 2.0%, from the same period in 2024. Full year 2025 automotive revenue of $592.5 million increased $178.5 million, or 43.1%, from the same period in 2024. This increase was broad-based and primarily driven by increased sales of our highly integrated applications supporting advanced driver assistance systems and infotainment. Communications revenue of $309.1 million increased $83.2 million, or 36.8%, from the same period in 2024 due to higher sales of power solutions for optical modules and routers. Full year 2025 consumer revenue of $255.2 million increased $53.2 million, or 26.3%, from the same period in 2024. This increase was a result of higher sales of products for home appliances and gaming. Revenue of $199.4 million from the industrial market increased $52.0 million, or 35.3%, from the same period in 2024 due to higher sales for power sources and instrumentation applications.

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.

Cost of revenue was $1,250.7 million, or 44.8% of revenue, for the year ended December 31, 2025, and $986.2 million, or 44.7% of revenue, for the year ended December 31, 2024. The $264.5 million increase in cost of revenue was primarily driven by higher shipment volume.

Gross margin was 55.2% for the year ended December 31, 2025, compared with 55.3% for the year ended December 31, 2024. The decrease in gross margin was mainly driven by higher warranty expenses as a percentage of revenue, partially offset by lower inventory write-downs as a percentage of revenue.

Research and Development (“R&D”)

R&D expenses primarily consist of cash-based 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.

R&D expenses were $382.3 million, or 13.7% of revenue, for the year ended December 31, 2025, and $324.7 million, or 14.7% of revenue, for the year ended December 31, 2024. The $57.6 million increase in R&D expenses was primarily due to a $30.1 million increase in cash-based compensation and benefits, a $9.1 million increase in new product development expenses, a $5.8 million increase in laboratory and other supplies, and a $4.1 million increase in stock-based compensation and related payroll taxes.

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

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

SG&A expenses were $428.8 million, or 15.4% of revenue, for the year ended December 31, 2025, and $356.8 million, or 16.2% of revenue, for the year ended December 31, 2024. The $72.0 million increase in SG&A expenses was primarily driven by a $37.3 million increase in cash-based compensation and benefits, and a $23.8 million increase in stock-based compensation and related payroll taxes.

Other Income, Net

Other income, net, was $37.6 million for the year ended December 31, 2025, compared with $33.6 million for the year ended December 31, 2024.

Income Tax Expense (Benefit), Net

The budget reconciliation bill H.R.1 (“H.R.1 Act”) signed into law on July 4, 2025, makes permanent certain expiring provisions of the 2017 Tax Cuts and Jobs Act and makes modifications to the existing tax framework. The primary impact for the current year is the immediate tax expensing of prior year unamortized and current year domestic R&D expenses and accelerated depreciation in the year ended December 31, 2025. Our tax provision for the year ended December 31, 2025 includes the estimated impact of the H.R.1 Act.

The income tax expense for the year ended December 31, 2025 was $144.7 million, or 18.9% of pre-tax income. The effective tax rate was lower than the federal statutory rate of 21% primarily due to income generated by our subsidiaries in lower tax jurisdictions and research tax credits. The lower effective tax rate relative to the federal statutory rate was partially offset by the U.S. taxation of foreign earnings and non-deductible stock-based compensation.

The income tax benefit for the year ended December 31, 2024 was $1.0 billion, or 177.9% of pre-tax income. The effective tax rate was lower than the federal statutory rate of 21% primarily due to tax benefits associated with a ten-year tax incentive. In 2024, one of our foreign subsidiaries was granted a ten-year tax incentive, beginning in 2025. A deferred tax benefit of $1.1 billion, net of $0.2 billion of deferred tax liability and $0.1 billion of valuation allowance, was recorded during the year ended December 31, 2024 to reflect the estimated future reductions in cash tax paid in that jurisdiction associated with the incentive. Furthermore, the effective tax rate for the year ended December 31, 2024 benefited from lower statutory tax rates at certain of our foreign subsidiaries. The effective tax rate was partially offset by the inclusion of the global intangible low-taxed income (“GILTI”) tax, the addition of a valuation allowance against foreign tax assets, and excess tax benefits from stock-based compensation.

In December 2024, we completed an intercompany transaction that resulted in one of our foreign subsidiaries recording a step up in the tax basis of intangible assets of $23.2 billion. This resulted in a deferred tax difference between the U.S. GAAP basis and local tax basis of the specified intangibles. We do not expect to realize the deferred tax asset for U.S. GAAP purposes; therefore, we have recorded a full valuation allowance of $23.2 billion as of December 31, 2024 which remains the same as of December 31, 2025.

In January 2025, the OECD released new Administrative Guidance on the application of the Global Anti-Base Erosion Model Rules. We will continue to evaluate the impact of this release and of other future guidance on our future global tax provision.

Liquidity and Capital Resources

As of December 31, 2025, we had cash and cash equivalents of $1.1 billion and short-term investments of $157.2 million, compared with cash and cash equivalents of $691.8 million and short-term investments of $171.1 million as of December 31, 2024. As of December 31, 2025, $672.9 million of cash and cash equivalents and $157.2 million of short-term investments were held by our foreign subsidiaries. For the years ended December 31, 2025 and 2024, we repatriated $275 million and $642 million, respectively, of cash from certain of our foreign subsidiaries to the U.S. with immaterial tax impact. The proceeds are primarily used to fund our stock repurchase program, dividend program and ongoing business operations. We may repatriate additional cash from certain of our foreign subsidiaries 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 for the periods presented:

For the year ended December 31, 2025, the $49.8 million increase in net cash provided by operating activities compared to the prior period was primarily due to increased accounts receivable collections, partially offset by increased inventory purchases and other changes in working capital.

For the year ended December 31, 2025, the $380.3 million decrease in net cash provided by investing activities compared to the prior period was primarily due to $403.3 million in lower net sales of investments.

For the year ended December 31, 2025, the $586.4 million decrease in net cash used in financing activities compared to the prior period was primarily due to a $628.6 million decrease in stock repurchases, partially offset by a $44.2 million increase in dividends and dividend equivalent payments.

Cash Requirements

Although consequences of economic uncertainties and macroeconomic conditions, including tariffs and retaliatory measures and announcements regarding the same, and many 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 $1.3 billion as of December 31, 2025, along with cash generated by ongoing operations, will be sufficient to satisfy our liquidity requirements for the next 12 months.

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.

As of December 31, 2025, total estimated future unconditional purchase commitments to all suppliers and other parties were $442.2 million, of which $389.8 million was due within a year.

Capital Return to Stockholders

In February 2025_,_ our Board of Directors approved a new stock repurchase program authorizing us to repurchase up to $500.0 million of our common stock through February 2028_._ Shares are retired upon repurchase. We repurchased approximately 8,000 shares of our common stock for an aggregate purchase price of $6.6 million during the year ended December 31, 2025. As of December 31, 2025, $493.4 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, 2025, accrued dividends totaled $76.0 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 2026, our Board of Directors approved an increase in the quarterly cash dividend from $1.56 per share to $2.00 per share, which amount will be paid on April 15, 2026 to all stockholders of record as of the close of business on March 31, 2026.

Other Long-Term Obligations

Other long-term obligations primarily include deferred compensation plan liabilities and accrued dividend equivalents. As of December 31, 2025, these obligations totaled $107.9 million.

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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, 2025, 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, 2025, there was no impact of changes in interest rates on 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 worldwide sales are primarily denominated in U.S. dollars. Accordingly, the reporting of our sales is not subject to foreign currency rate changes. The functional currency of our offshore non-sales operations is generally the local currency, primarily 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, 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.

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MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED FINANCIAL STATEMENTS

Contents

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, 2025 and 2024, 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, 2025, 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, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2025, 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, 2025, 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 27, 2026 expressed an adverse opinion thereon.

Restatement of 2024 Financial Statements

As discussed in Note 2 to the consolidated financial statements, the 2024 consolidated financial statements have been restated to correct a misstatement.

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 disclosure to which it relates.

/s/ Ernst & Young LLP

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

San Jose, California

February 27, 2026

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, 2025, 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, 2025, 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 review of deferred income taxes.

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, 2025 and 2024, the related consolidated state

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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, 2025, 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 and the resulting restatement 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. 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.

As of December 31, 2025, we identified a material weakness in our internal control over financial reporting. During the year-end financial reporting process for fiscal year 2025, the material weakness was identified in internal control over financial reporting related to the accounting for deferred income taxes. We engaged third-party tax service providers in connection with the original determination of the accounting for deferred income taxes associated with a one-time tax incentive granted by a certain foreign jurisdiction. Nevertheless, the internal controls in place with respect to the review of the calculation of deferred income taxes and the related income tax expense (benefit) were not designed appropriately or operating effectively as of December 31, 2025 and 2024.

We have developed a remediation plan for this material weakness, which is described below.

As further described in Note 2 and Note 17 to the Consolidated Financial Statements, the identified material weakness resulted in the misstatement of deferred income taxes and income tax benefit, net for the fiscal year ended December 31, 2024. 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:

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 material 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 2026. However, there can be no assurance as to when such remediation will be completed. As the remediation plan is implemented, management may take additional measures or modify the remediation plan elements described above.

Changes in Internal Control over Financial Reporting

Except for the remediation measures related to the material weakness described above, there were no changes in our internal control over financial reporting that occurred during the quarter ended December 31, 2025, that would have materially affected, or were reasonably likely to materially affect, our internal control over financial reporting.

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.

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10b5-1 Trading Plans

Certain of our executive officers and directors 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 Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan, amended and restated, and upon vesting of RSUs.

The following table summarizes the adoption of trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) during the three months ended December 31, 2025:

The following table summarizes the termination of trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) during the three months ended December 31, 2025:

During the three months ended December 31, 2025, no trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) were modified, 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.

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Not applicable.

PART III

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Reference is made to the information regarding directors and nominees, code of ethics, insider trading policy and other corporate governance matters and disclosure relating to compliance with Section 16(a) of the Securities Exchange Act of 1934 appearing in the Company’s Proxy Statement for its 2026 Annual Meeting of Stockholders (the “2026 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.

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The information required by this item will be set forth under the caption “Named Executive Officer Compensation” in the Company’s Proxy Statement for the 2026 Annual Meeting, and is incorporated herein by reference.

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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 2026 Annual Meeting, and is incorporated herein by reference.

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The information required by this item will be set forth under the captions “Certain Relationships and Related Transactions” and “Proposal One - Election of Directors” in the Company’s Proxy Statement for the 2026 Annual Meeting, and is incorporated herein by reference.

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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 2026 Annual Meeting, and is incorporated herein by reference.

PART IV

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(a) Documents filed as part of this report

(1) All financial statements

(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

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None.

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.

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 27, 2026 by the following persons on behalf of the registrant and in the capacities indicated: