Lam Research (LRCX)CEO sold ~$18.6M

~$18.6M

Approx. value · 113K sh @ $163.86

932K

Holds after · shares reported

Traded

Dec 17, 2025

Filed

Dec 18, 2025

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Oct 22, 2025Company filing · Form 8-K · ResultsReported its results
2. Oct 27, 2025Insider · 1 personInsiders: 2 sales (~$1.4M)
3. Nov 3, 2025InsiderDirector sold ~$208K of LRCX shares in the open market
4. Nov 4, 2025Company filing · Form 8-K · Shareholder rights, Executive changeChanged a top executive or board member, and changed the rights of its shareholders (and 2 more items)
5. Nov 7, 2025InsiderDirector sold ~$4.8K of LRCX shares in the open market
6. Nov 14, 2025InsiderCFO sold ~$6.04M of LRCX shares in the open market
7. Nov 20, 2025Government · Federal Register noticePhasedown of Hydrofluorocarbons: Notice of 2026 Allowance Allocations for Production and Consumption of Regulated Substances Under the American Innovation and Manufacturing Act of 2020, and Notice of Final Actions Establishing Administrative Consequences
8. Dec 17, 2025 · this disclosureInsider · Their largest sale since 2013CEO sold ~$18.6M of LRCX shares in the open market

What came next

1. Dec 17, 2025InsiderCEO sold ~$8.19M of LRCX shares in the open market
2. Dec 29, 2025CongressDisclosed purchase of LRCX — reported range $50,001 - $100,000
3. Jan 8, 2026Congress · 2 peopleMembers of Congress: 3 sales
4. Jan 16, 2026CongressDisclosed sale of LRCX — reported range $1,001 - $15,000
5. Jan 28, 2026Company filing · Form 8-K · ResultsReported its results
6. Jan 30, 2026Company filing · Form 8-K · Executive changeChanged a top executive or board member“On February 3, 2026, the Board of Directors (the “Board”) of Lam Research Corporation (the “Company”), pursuant to applicable provisions of the Company’s Amended and Restated Bylaws, appointed Anirudh Devgan, Ph.D., age 56, as a director of the Company, effective immediately.”
7. Jan 30, 2026Company filing · Form 8-K · Executive changeChanged a top executive or board member“On February 3, 2026, Lam Research Corporation (the “Company”) filed a Current Report on Form 8-K (the “Initial Form 8-K”) wherein it reported that it had issued a press release (the “Exhibit 99.2 Press Release”) announcing the retirement of Patrick J. Lord, Ph.D. and the appointment of Seshasayee (Sesha) Varadarajan as the Company’s executive vice president and chief operating officer.”
8. Feb 3, 2026CongressDisclosed purchase of LRCX — reported range $15,001 - $50,000
9. Feb 6, 2026Insider · 1 personInsiders: 2 sales (~$7.9M)
10. Feb 26, 2026Congress · 1 personMembers of Congress: 2 sales
11. Mar 2, 2026Insider · 2 peopleInsiders: 2 sales (~$10.2M)
12. Mar 4, 2026Insider · 2 peopleInsiders: 2 sales (~$11.5M)
13. Mar 12, 2026CongressDisclosed purchase of LRCX — reported range $1,001 - $15,000
14. Mar 27, 20265% stakeThe Vanguard Group reported a passive stake (13G)

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Lam Research

For Lam Research, OQRO holds 11 insider filings (SEC Form 4 or Form 144), 2 Congress trade reports and 134 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its LRCX page.

Other recent filings by Timothy Archer, President and CEO

• SEC Form 4 at Lam Research (LRCX)Sep 10, 2026
• SEC Form 4 at Lam Research (LRCX)Aug 7, 2026
• SEC Form 4 at Lam Research (LRCX)Jul 6, 2026
• SEC Form 4 at Lam Research (LRCX)Dec 18, 2025

The full history of Timothy Archer, President and CEO is on the profile page.

How this filing works

• SEC Form 4
• Open-market purchase
• Rule 10b5-1 trading plans

Other disclosures at Lam Research

• SEC Form 4Sep 10, 2026
• SEC Form 4Sep 10, 2026
• SEC Form 144Sep 9, 2026
• SEC Form 144Sep 9, 2026
• SEC Form 4Sep 3, 2026
• SEC Form 4Sep 3, 2026

Everything OQRO holds on this company is on its LRCX page.