LAM RESEARCH CORP

Rule 10b5-1 and Non-Rule 10b5-1 Trading Arrangements

During the Company’s fiscal quarter ended December 28, 2025, except for the following arrangement, none of the Company’s directors or officers adopted, modified, orterminated a trading arrangement for the purchase or sale of the Company’s common stock that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) (a “Rule 10b5-1 Trading Arrangement”) or a non-Rule 10b5-1 trading arrangement (as defined in Item 408(c) of Regulation S-K).

•On October 29, 2025, Patrick J. Lord, the Executive Vice President and Chief Operating Officer of the Company, adopted a Rule 10b5-1 Trading Arrangement. Dr. Lord’s Rule 10b5-1 Trading Arrangement provides for: (i) the potential sale of up to 36,645 shares of the Company’s common stock; (ii) the potential exercise of 10,130 stock options expiring March 1, 2029 and the associated sale of up to 10,130 shares of the Company’s common stock resulting from such exercise; (iii) the

Lam Research Corporation 2025 Q3 10-Q 38 potential exercise of 28,140 stock options expiring March 1, 2030 and the associated sale of up to 28,140 shares of the Company’s common stock resulting from such exercise; (iv) the potential exercise of 21,220 stock options expiring March 1, 2031 and the associated sale of up to 21,220 shares of the Company’s common stock resulting from such exercise; (v) the potential sale of the net shares of the Company’s common stock resulting from the vesting of 17,244 service-based restricted stock units (net shares are net of tax withholding); and (vi) subject to performance conditions, the potential sale of the net shares of the Company’s common stock resulting from the vesting of 63,345 market-based performance restricted stock units (representing the maximum number of shares that may be issued; the final number of shares that may be earned is 0% to 150% of the target number of 42,230); in each case pursuant to the terms of the Rule 10b5-1 Trading Arrangement. Dr. Lord’s Rule 10b5-1 Trading Arrangement has a termination date of October 30, 2026.

•On November 12, 2025, Bethany J. Mayer, a member of the Board of Directors of the Company, adopted a Rule 10b5-1 Trading Arrangement. Ms. Mayer’s Rule 10b5-1 Trading Arrangement provides for the potential sale of up to 615 shares of the Company’s common stock. Ms. Mayer’s Rule 10b5-1 Trading Arrangement has a termination date of November 9, 2026.

•On November 17, 2025, Neil J. Fernandes, the Senior Vice President, Global Customer Operations, of the Company, adopted a Rule 10b5-1 Trading Arrangement. Mr. Fernandes’ Rule 10b5-1 Trading Arrangement provides for the potential sale of up to 25,829 shares of the Company’s common stock pursuant to the terms of the Rule 10b5-1 Trading Arrangement. Mr. Fernandes’ Rule 10b5-1 Trading Arrangement has a termination date of November 30, 2026.

The Rule 10b5-1 Trading Arrangementsof Dr. Lord and Mr. Fernandes contain pricing conditions that preclude or limit the sale of shares below predetermined minimum prices. Each of the Rule 10b5-1 Trading Arrangements will terminate on the earlier of: (a) its respective termination date indicated above; (b) execution of all trades or expiration of all the orders relating to such trades under the Rule 10b5-1 Trading Arrangement; or (c) such date as the Rule 10b5-1 Trading Arrangement is otherwise terminated according to its terms.

Lam Research Corporation 2025 Q3 10-Q 39