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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

For the fiscal year ended June 28, 2026

OR

For the transition period from to .

Commission file number: 000-12933

Registrant’s telephone number, including area code: (510) 572-0200

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

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 Registrant’s Common Stock, $0.001 par value, held by non-affiliates of the Registrant, as of December 28, 2025, the last business day of the Registrant’s most recently completed second fiscal quarter, was $178,309,002,956. Common Stock held by each executive officer, director, and person who owns more than 5% of the outstanding Common Stock has been excluded from this computation based on the assumption that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination of such status for other purposes.

As of August 4, 2026, the Registrant had 1,251,321 thousand outstanding shares of Common Stock.

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Documents Incorporated by Reference

Parts of the Registrant’s Proxy Statement for the Annual Meeting of Stockholders expected to be held on or about November 3, 2026, are incorporated by reference into Part III of this Annual Report on Form 10-K. Except as expressly incorporated by reference herein, the Registrant’s Proxy Statement shall not be deemed to be part of this report.

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LAM RESEARCH CORPORATION

2026 ANNUAL REPORT ON FORM 10-K

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PART I

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K (“Form 10-K” or “2026 Form 10-K”) contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements other than statements of historical fact contained in this report are forward-looking statements. In some cases, forward-looking statements can be identified by words such as “aim,” “accelerate,” “anticipate,” “assume,” “believe,” “become,” “continue,” “can,” “commit,” “could,” “drive,” “estimate,” “focus,” “forecast,” “goal,” “grow,” “target,” “expect,” “increase,” “intend,” “likely,” “may,” “maintain,” “objective,” “ongoing,” “opportunity,” “pipeline,” “plan,” “possible,” “potential,” “predict,” “probable,” “progress,” “project,” “scale,” “seek,” “should,” “strategy,” “sustain,” “transition,” “will,” “work,” “would,” or variations of these words or other similar expressions. However, the absence of these words or similar expressions does not mean that a statement is not forward-looking. Forward-looking statements in this report include, but are not limited to, statements concerning: our future results of operations and financial condition; our commitment to driving semiconductor breakthroughs; trends related to demand for electronic systems, including for high performance, energy efficient and highly integrated semiconductor devices, semiconductor manufacturer adoption of vertical scaling and advanced integration approaches, technology inflections, including increasing manufacturing complexity and precision requirements, and demand for our technologies and services; our belief regarding our position in deposition, etch, and clean markets and perceived opportunities for sustainable differentiation for us due to several specified factors; the performance and benefits of our products and services; trends related to increasing requirements for semiconductor device density, performance, and energy efficiency and demand for energy- and compute-intensive applications and related effects; our research and development strategy, and beliefs and expectations regarding perceived opportunities and continued investments in research and development; our efforts to maintain relationships with customers; customers continuing to establish joint ventures, alliances, and licensing arrangements and related effects on our competitive position and market opportunities; our beliefs regarding our third-party outsourcing arrangements and our ability to manage related risks; our efforts to comply with new and changing regulations and efforts to grow our business; our acquisition strategy; our environmental, social and governance (“ESG”) goals and targets; our efforts to compete in the markets we serve, to strengthen and enhance our products and services, and to maintain customer service and support; our ability to succeed in the marketplace and the implications of a semiconductor manufacturer selecting and qualifying a supplier’s equipment; our ability to continue to meet the expectations of our customers in the presence of competition and our expectations regarding our competitors’ performance; our intellectual property strategy; our approach to human capital and employment, recruitment and development activities; our environmental health and safety (“EHS”) goals and certifications; our belief regarding the condition of our facilities; our capital allocation strategy, including our intention to pay quarterly dividends, our focus to return a portion of our free cash flow to stockholders over time through dividends and share repurchases, and expected sources of funds for capital return activities; continued growth of wafer fabrication investment in calendar year 2026, including the role of the artificial intelligence (“AI”) market in driving higher spending across both the memory and non-memory market segments; our belief regarding demand for semiconductors and technology inflections in the semiconductor industry driving sustainable growth and increasing served available market for our products and services in the deposition, etch, and clean businesses; customer investments driving demand for our products and services; beliefs, estimates, and assumptions relating to our significant accounting policies, including with respect to revenue recognition, inventory valuation, and income taxes; our expectations regarding the sufficiency of our liquidity to support our anticipated business activities through the next twelve months based on anticipated cash flows and our current business outlook; the use of net proceeds from the commercial paper Program; our ability to access the capital markets; the dependence of our liquidity on our future revenues and ability to manage costs; off-balance sheet arrangements and contractual obligations; expectations regarding deferred revenue; estimates and expectations regarding equity-based compensation plans; our evaluation, expectations, and beliefs regarding deferred income taxes and carryforwards; our evaluation of uncertain tax positions and related effects if recognized; financial instruments and related fair value estimates and assumptions, and credit concentration risks; obligations under our deferred compensation plans; commitments and contingencies, including our beliefs regarding the materiality of legal proceedings and probability of a material loss; and other statements included in Part I, Item 1, “Business,” Part I, Item 1A, “Risk Factors,” Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in this Form 10-K.

These forward-looking statements are not a guarantee of future performance and involve a number of risks, uncertainties, and other factors that could cause our actual results or outcomes, or the timing of our results or outcomes, to differ materially from those expressed or implied in this Form 10-K. Such risks, uncertainties, and other factors include, among others, the following:

• our assumptions related to continued expansion of the wafer fabrication equipment market, growth of deposition and etch intensity, and scaling of our operating framework may prove invalid;

• business, economic, political and/or regulatory conditions in the consumer electronics industry, including wafer fabrication equipment spending, the semiconductor industry and the overall economy may deteriorate or change;

• the actions, performance, or investment levels of our customers and competitors may be inconsistent with our expectations;

• customer and product mix, including across market segments and geographical regions, may change;

• we may be unable to effectively manage and implement pricing actions, realize the value of our products and technology, successfully commercialize new products and technologies, or execute on perceived opportunities;

• we may be unable to achieve anticipated operational, manufacturing, supply chain, procurement, and scale efficiencies;

• customer technology transitions, capacity expansions, and fab construction projects may have different timing or be less successful than we expect;

• we may be unable to manage operating expenses effectively while continuing to invest in research and development, product innovation, customer support, and future growth opportunities;

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• trade regulations, export controls, tariffs, trade disputes, and other geopolitical developments may inhibit our ability to sell our products;

• supply chain cost increases, tariffs, and other inflationary pressures have impacted and may continue to impact our profitability;

• supply chain disruptions or manufacturing capacity constraints may limit our ability to manufacture and sell our products;

• natural and human-caused disasters, disease outbreaks, war, terrorism, political or governmental unrest or instability, or other events beyond our control may impact our operations and revenue in affected areas; and

• the other factors described in Part I, Item 1, “Business,” Part I, Item 1A, “Risk Factors,” Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and Part II, Item 7A “Quantitative and Qualitative Disclosures About Market Risk” of this Form 10-K and other documents we file from time to time with the Securities and Exchange Commission (“SEC”), such as our quarterly reports on Form 10-Q and our current reports on Form 8-K.

You should evaluate all forward-looking statements made in this Form 10-K in the context of these risks, uncertainties, and other factors. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof and are based on our current beliefs, expectations, and assumptions about future events. Except as required by law, we do not undertake any obligation to revise or update these forward-looking statements as a result of events or circumstances that occur after the date of this report or to reflect the occurrence or effect of anticipated or unanticipated events.