LAM RESEARCH CORP (LRCX) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-02-27 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: LAM RESEARCH CORP (LRCX) CIK: 0000707549 --- Reporting Owner --- Name: Vahedi Vahid CIK: 0001707826 Role: Officer (Senior Vice President) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-02-27 | Code: A (Grant or award) Shares: +9,053 | Price: $0.00 Shares Owned After: 309,870 | Ownership: D (Direct) Footnotes: [F1] The restricted stock units will vest in three equal installments on 02/27/2027, 02/27/2028, and 02/27/2029. [F2] The amount reported includes shares subject to unvested restricted stock units. [Transaction #2] Security: Common Stock Date: 2026-02-27 | Code: F (Payment of exercise/tax) Shares: -24,675 | Price: $233.89 Total Value: $5,771,235.75 Shares Owned After: 285,195 | Ownership: D (Direct) Footnotes: [F3] Represents shares that were automatically withheld upon vesting of restricted stock units to satisfy tax withholding obligations. [F2] The amount reported includes shares subject to unvested restricted stock units. [Transaction #3] Security: Common Stock Date: 2026-02-27 | Code: F (Payment of exercise/tax) Shares: -2,994 | Price: $233.89 Total Value: $700,266.66 Shares Owned After: 282,201 | Ownership: D (Direct) Footnotes: [F3] Represents shares that were automatically withheld upon vesting of restricted stock units to satisfy tax withholding obligations. [F2] The amount reported includes shares subject to unvested restricted stock units. [Transaction #4] Security: Common Stock Date: 2026-02-27 | Code: F (Payment of exercise/tax) Shares: -1,923 | Price: $233.89 Total Value: $449,770.47 Shares Owned After: 280,278 | Ownership: D (Direct) Footnotes: [F3] Represents shares that were automatically withheld upon vesting of restricted stock units to satisfy tax withholding obligations. [F2] The amount reported includes shares subject to unvested restricted stock units. [Transaction #5] Security: Common Stock Date: 2026-03-27 | Code: F (Payment of exercise/tax) Shares: -3,382 | Price: $233.89 Total Value: $791,015.98 Shares Owned After: 276,896 | Ownership: D (Direct) Footnotes: [F3] Represents shares that were automatically withheld upon vesting of restricted stock units to satisfy tax withholding obligations. [F2] The amount reported includes shares subject to unvested restricted stock units. --- Derivative Transactions --- [Transaction #1] Security: Market-based Performance Restricted Stock Unit Date: 2026-02-27 | Code: A (Grant or award) Shares: +11,065 | Price: $0.00 Shares Owned After: 11,065 | Ownership: D (Direct) Footnotes: [F4] The Market-based performance restricted stock units will vest between 0% and 150% on 2/27/2029. The performance of this award is based on the percentile ranking of Lam Research's Total Shareholder Return relative to the Total Shareholder Return of the companies in the PHLX Semiconductor Total Return Index during the performance period of 02/2/2026 through 02/01/2029. [F4] The Market-based performance restricted stock units will vest between 0% and 150% on 2/27/2029. The performance of this award is based on the percentile ranking of Lam Research's Total Shareholder Return relative to the Total Shareholder Return of the companies in the PHLX Semiconductor Total Return Index during the performance period of 02/2/2026 through 02/01/2029. --- Footnotes (Complete Index) --- F1: The restricted stock units will vest in three equal installments on 02/27/2027, 02/27/2028, and 02/27/2029. F2: The amount reported includes shares subject to unvested restricted stock units. F3: Represents shares that were automatically withheld upon vesting of restricted stock units to satisfy tax withholding obligations. F4: The Market-based performance restricted stock units will vest between 0% and 150% on 2/27/2029. The performance of this award is based on the percentile ranking of Lam Research's Total Shareholder Return relative to the Total Shareholder Return of the companies in the PHLX Semiconductor Total Return Index during the performance period of 02/2/2026 through 02/01/2029. --- Signature --- /s/ Marta Woods by Power of Attorney (2026-03-02)