LAM RESEARCH CORP (LRCX) · Initial Holdings (Form 3) SEC Filing

=== SEC Form 3 — Statement of Changes in Beneficial Ownership === Document Type: 3 Period of Report: 2026-03-06 --- Issuer --- Name: LAM RESEARCH CORP (LRCX) CIK: 0000707549 --- Reporting Owner --- Name: Rammohan Karthikeyan CIK: 0002113601 Role: Officer (SVP, Global Ops & Ent Solns) --- Holdings --- [Holding #1] Security: Common Stock Ownership: D (Direct) Footnotes: [F1] The amount reported includes shares subject to unvested restricted stock units. [Holding #2] Security: Common Stock Ownership: I (Indirect) [Holding #3] Security: Common Stock Ownership: I (Indirect) [Holding #4] Security: Market-based Performance Restricted Stock Unit Ownership: D (Direct) Footnotes: [F2] The Market-based performance restricted stock units will vest between 0% and 150% on 2/28/2028. 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 02/03/2025 through 02/02/2028. [F2] The Market-based performance restricted stock units will vest between 0% and 150% on 2/28/2028. 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 02/03/2025 through 02/02/2028. [Holding #5] Security: Market-based Performance Restricted Stock Unit Ownership: D (Direct) Footnotes: [F3] The Market-based performance restricted stock units will vest between 0% and 150% on 03/01/2027. The performance of this award is based on the Lam Research Total Shareholder Return performance relative to the PHLX Semiconductor Total Return Index Total Shareholder Return during the performance period of 02/01/2024 through 01/31/2027. [F3] The Market-based performance restricted stock units will vest between 0% and 150% on 03/01/2027. The performance of this award is based on the Lam Research Total Shareholder Return performance relative to the PHLX Semiconductor Total Return Index Total Shareholder Return during the performance period of 02/01/2024 through 01/31/2027. [Holding #6] Security: Market-based Performance Restricted Stock Unit 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 amount reported includes shares subject to unvested restricted stock units. F2: The Market-based performance restricted stock units will vest between 0% and 150% on 2/28/2028. 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 02/03/2025 through 02/02/2028. F3: The Market-based performance restricted stock units will vest between 0% and 150% on 03/01/2027. The performance of this award is based on the Lam Research Total Shareholder Return performance relative to the PHLX Semiconductor Total Return Index Total Shareholder Return during the performance period of 02/01/2024 through 01/31/2027. 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 (2026-03-10)