1089 INVESTMENT RESEARCH INC.

ed in the appropriate investment funds in accordance with the participants’ directions and the Plan’s provisions. 7 Table of Contents Employer contributions - The Company may make matching contributions as defined in the Plan. In 2025, the Company matched 50 % of each eligible participant’s salary deferral contribution (excluding catch-up contributions and after-tax contributions) up to a maximum of the first 6 % of the participant’s eligible compensation, on a per-payroll-period basis. If a participant who was an active employee on the last day of the plan year did not receive the full 50 % Company match, the Company provided a year end “true up” contribution to provide such participants with the 50 % that they would have received had the timing of their contributions not limited the Comp

utions. No additional discretionary matching contributions or discretionary profit sharing contributions were made for the year ended December 31, 2025. Vesting - Participants are immediately vested in their entire account, including employer matching, additional discretionary matching, and discretionary profit sharing contributions (if any). Participant accounts - Each participant’s account is credited with the participant’s contributions, Plan earnings or losses in funds selected by the participant, and an allocation of the Company’s contribution, if any. Allocation of the Company’s contribution is based on participant contributions and / or compensation, as defined in the Plan. In the event that the participant fails to make an investment election, participant contributions and Company

nt reduction in either taxable or after-tax compensation (in the form of pretax, Roth or after-tax contributions). New hires that do not make an affirmative election otherwise are automatically enrolled in the Plan with a taxable compensation deferral rate of 6 % on a pre-tax basis. Participants are permitted to designate their contributions as Roth contributions subject to current taxation as wages but which, together with earnings, would be nontaxable when distributed from the Plan, and participants may elect to have certain vested assets held on an after-tax and pre-tax basis converted to be considered designated Roth contributions. Contributions withheld are invested in accordance with the participants’ directions. Participants are also allowed to make rollover contributions of amounts

07,716 Employer’s 37,847,922 Rollovers 16,604,696 186,560,334 Total additions 1,022,404,439 Deductions from net assets attributed to: Withdrawals and distributions ( 262,519,081 ) Administrative expenses ( 751,057 ) Total deductions ( 263,270,138 ) Net increase in net assets 759,134,301 Net assets available for benefits: Beginning of year 2,830,979,711 End of year $ 3,590,114,012 See notes to financial statements 5 Table of Contents SAVINGS PLUS PLAN, LAM RESEARCH 401(k) NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 2025 and 2024 NOTE 1 - THE PLAN AND ITS SIGNIFICANT ACCOUNTING POLICIES General - The following description of the Savings Plus Plan, Lam Research 401(k) (the “Plan”) provides only general information about the Plan in the form existing on December 31, 2025. Readers should refer t