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Public ownership evidence

Lam Research Corp (LRCX) Ownership Disclosures

Read LRCX insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

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2026-09-102026-09-09ARCHER TIMOTHYS30,000Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-09-09 and its public availability date is 2026-09-10. Subtracting those calendar dates gives 1 day of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code S: a sale. A purchase-following rule excludes this sale even if the reported dollar amount is large.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0001343600-26-000013 ↗SEC 0001405693-26-000011 ↗SEC 0001707827-26-000006 ↗

Recent Form 4 activity

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2026-09-102026-09-09ARCHER TIMOTHYS30,000Not reported
2026-09-102026-09-09Mayer BethanyS9,557Not reported
2026-09-042026-09-02Varadarajan SeshasayeeS27,480Not reported
2026-09-042026-09-02Varadarajan SeshasayeeS12,270Not reported
2026-09-042026-09-02Varadarajan SeshasayeeS20,000Not reported
2026-09-022026-08-31Harter AvaS5,000Not reported
2026-08-082026-08-06ARCHER TIMOTHYS30,000Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

Inspect all 50 displayed rows: Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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Alternative Investment Advisors, LLC.2026-06-302026-09-0117,383$7,532,769None
Cornerstone Financial Management LLC2026-06-302026-08-29222$96,199None
Cornerstone Financial Management LLC2026-03-312026-08-29131$27,989None
Cornerstone Financial Management LLC2025-12-312026-08-29112$19,172None
B. Riley Wealth Advisors, Inc.2025-03-312026-08-2993,872$6,824,501None
OPTIMIZE FINANCIAL INC.2026-06-302026-08-2814,010$6,070,953None
Corient Private Wealth LP2026-06-302026-08-28949,264$411,345,234None
Corient Private Wealth LP2026-06-302026-08-2826,547$11,503,939None
TUCKER ASSET MANAGEMENT LLC2026-03-312026-08-282,056$439,318None
Formuepleje A/S2026-06-302026-08-287,565$3,278,141None
Formuepleje A/S2026-03-312026-08-2815,640$3,341,642None
Wellington Grp LLC2026-06-302026-08-277,632$3,307,175None
Reflection Asset Management2026-03-312026-08-2712,541$2,680,242None
Legacy Edge Advisors, LLC2025-09-302026-08-276,210$831,519None
HORAN Wealth, LLC2026-06-302026-08-27623$269,909None
Principia Wealth Advisory, LLC2026-06-302026-08-27267$115,699None
Principia Wealth Advisory, LLC2026-03-312026-08-27607$129,692None
Brown Financial Advisors2026-06-302026-08-276,727$2,915,011None
Advisors Asset Management, Inc.2025-03-312026-08-2764,870$4,716,049None
Advisors Asset Management, Inc.2025-09-302026-08-2785,247$11,414,573None
Dakota Wealth Management2025-09-302026-08-279,739$1,304,053None
Dakota Wealth Management2025-12-312026-08-2728,731$4,918,201None
Dakota Wealth Management2026-03-312026-08-2722,733$4,857,193None
Redwood Investment Management, LLC2025-09-302026-08-279,459$1,267,000None
Redwood Investment Management, LLC2025-12-312026-08-276,369$1,090,000None
Advus Financial Partners, LLC2026-06-302026-08-263,578$1,550,455None
Advus Financial Partners, LLC2026-03-312026-08-263,544$757,211None
Advus Financial Partners, LLC2025-12-312026-08-263,227$552,398None
Advus Financial Partners, LLC2025-09-302026-08-262,659$356,040None
Advus Financial Partners, LLC2025-06-302026-08-262,823$274,791None
Advus Financial Partners, LLC2025-03-312026-08-263,455$251,179None
Advus Financial Partners, LLC2024-12-312026-08-263,315$239,442None
Groupe la Francaise2026-06-302026-08-26118,568$51,390,974None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-03-312026-08-26409,151$87,419,203None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-06-302026-08-26392,874$170,244,090None
Advisors Asset Management, Inc.2025-06-302026-08-2574,899$7,290,669None
Vancity Investment Management Ltd2026-06-302026-08-257,209$3,124,000None
CYBER HORNET ETFs LLC2026-06-302026-08-253,407$1,476,355None
Strategic Financial Services, Inc.2026-06-302026-08-2534,437$14,922,585None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-251,895,716$821,470,614None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25821,470,614$1,895,716,000None
Advisors Asset Management, Inc.2024-12-312026-08-2246,304$3,344,538None
Advisors Asset Management, Inc.2025-12-312026-08-2294,695$16,209,890None
WEST MICHIGAN ADVISORS, LLC2026-06-302026-08-224,738$2,054,362None
Assenagon Asset Management S.A.2026-06-302026-08-22519,230$224,997,936None
Ridgepath Capital Management LLC2026-06-302026-08-212,080$901,326None
Rehmann Capital Advisory Group2026-06-302026-08-219,408$4,072,213None
Jackson Wealth Management, LLC2026-06-302026-08-217,815$3,386,000None
CLIFFORD SWAN INVESTMENT COUNSEL LLC2026-06-302026-08-217,400$3,206,642Put
CLIFFORD SWAN INVESTMENT COUNSEL LLC2026-06-302026-08-217,300$3,163,309Put

90-day public filing window, up to 50 source positions.

Alternative Investment Advisors, LLC. ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗B. Riley Wealth Advisors, Inc. ↗OPTIMIZE FINANCIAL INC. ↗Corient Private Wealth LP ↗Corient Private Wealth LP ↗TUCKER ASSET MANAGEMENT LLC ↗Formuepleje A/S ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.