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Lam Research (LRCX) Institutional Ownership & Insider Trading History

Top LRCX institutional shareholders, filing changes, and Form 4 insider activity with filters for buys, sales, option exercises, gifts, and tax withholding.

Section freshness

Prices as of Sep 28, 4:00 PM EDT · Fundamentals checked Sep 29, 8:40 AM EDT · Statements Jun 28, 2026

Ownership read

LRCX insider transaction activity: Mixed, sale-heavy.

Blackrock Inc. is the largest institutional holder. 26 sales and 1 purchases appear in the recent Form 4 filings. Use the filters below to separate open-market activity from option exercises, gifts, awards, and tax withholding.

Review insider tradesView institutions

Insider flow

LRCX

Purchases9
Sales832.61K

Directional bars ignore awards, gifts, conversions, and tax withholding rows.

Top holder

132.73M

Blackrock Inc.

Insider transaction activity

Mixed, sale-heavy

$187.92M sold / $602 bought

Observations shown

104

10 holder / 94 insider

Holder rows
10
Yahoo Finance · Filing dates shown per row
Increased / initiated
7
3 decreased · provider-reported changes
Insider rows
94
Yahoo Finance · Filing dates shown per row

Ownership concentration and transaction activity

Top 10 reported holders
41.68% outstanding
Changes with share-count history
Prior-position data unavailable
New / exited positions
0 / 0 explicitly reported
Largest increase with share-count history
Prior share counts unavailable

Reported-holder cohort only; absence from a limited provider list does not establish an exit. Changes are provider-reported and are only comparable quarter over quarter when the position periods match.

Net shares sold: 832,600

Sale-code S shares minus purchase-code P shares in this sample. Includes disclosed plans and unknown plan status; excludes grants, gifts, exercises and withholding. This is activity, not sentiment.

  • Conversion / exercise: 10
  • Purchase / sale; plan unknown: 27
  • Gift: 7
  • Grant: 36
  • Other / unclassified: 14

Top 10 institutional holders

Lam Research (LRCX) institutional ownership

Ranked by reported share count, with position changes and separate position and filing dates where ownership data supplies them.

Lam Research (LRCX) institutional ownership
#Institution% heldSharesChange %Position / filing date
1
Blackrock Inc.
10.6%132.73M-0.09%Position as of Jun 30, 2026Filing date unknown
2
Vanguard Capital Management LLC
6.53%81.68M+0.65%Position as of Jun 30, 2026Filing date unknown
3
State Street Corporation
4.85%60.70M+2.61%Position as of Jun 30, 2026Filing date unknown
4
Invesco Ltd.
4.18%52.32M+3.68%Position as of Jun 30, 2026Filing date unknown
5
JPMORGAN CHASE & CO
3.62%45.32M+38.53%Position as of Jun 30, 2026Filing date unknown
6
Vanguard Portfolio Management LLC
2.93%36.64M-1.15%Position as of Jun 30, 2026Filing date unknown
7
Geode Capital Management, LLC
2.76%34.51M-1.90%Position as of Jun 30, 2026Filing date unknown
8
FMR, LLC
2.69%33.68M+0.31%Position as of Jun 30, 2026Filing date unknown
9
Price (T.Rowe) Associates Inc
1.97%24.60M+85.78%Position as of Jun 30, 2026Filing date unknown
10
Morgan Stanley
1.54%19.22M+1.30%Position as of Jun 30, 2026Filing date unknown
Showing 10 of 10 matching institutional rows.

Recent insider transactions

Lam Research (LRCX) Form 4 filings

Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.

Lam Research (LRCX) Form 4 insider transactions
#Insider% companyActionSharesTransaction date
1
ARCHER TIMOTHY M
Chief Executive Officer
<0.01%Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Conversion / exercise
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

30.00KSep 9, 2026
2
ARCHER TIMOTHY M
Chief Executive Officer
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

30.00KSep 9, 2026
3
MAYER BETHANY J
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

9.56KSep 9, 2026
4
VARADARAJAN SESHASAYEE
Officer
<0.01%Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Conversion / exercise
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

39.75KSep 2, 2026
5
VARADARAJAN SESHASAYEE
Officer
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

59.75KSep 2, 2026
6
HARTER AVA
Officer
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

5.00KAug 31, 2026
7
ARCHER TIMOTHY M
Chief Executive Officer
<0.01%Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Conversion / exercise
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

30.00KAug 6, 2026
8
ARCHER TIMOTHY M
Chief Executive Officer
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

30.00KAug 6, 2026
9
TALWALKAR ABHIJIT Y
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

18.28KJul 13, 2026
10
ARCHER TIMOTHY M
Chief Executive Officer
<0.01%Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Conversion / exercise
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

30.00KJul 2, 2026
11
ARCHER TIMOTHY M
Chief Executive Officer
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

30.00KJul 2, 2026
12
BRANDT ERIC K
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

54.50KJun 12, 2026
Showing 12 of 94 matching Form 4 rows. Percent of company uses current shares outstanding.

Frequently asked

Common questions.

Who are the largest LRCX shareholders?

Blackrock Inc. is the largest reported institutional holder of LRCX, with 132.73 million shares, or about 10.61% of shares outstanding.

What does the institutional filing activity show for LRCX?

Lam Research has 10 institutional rows on file: 7 increased or initiated positions and 3 reduced them.

What insider transactions are available for LRCX?

TECHi shows 94 dated LRCX insider transactions through Sep 9, 2026, with transaction types kept separate so administrative actions are not presented as open-market trades.

Are LRCX insiders buying or selling?

The displayed LRCX activity reads Mixed, sale-heavy: 26 sales and 1 purchases. Other transaction types remain separate.

Who is the most active reported LRCX insider?

ARCHER TIMOTHY M has the largest absolute share movement in the displayed LRCX filing rows, totaling 991,311 shares. The action labels provide the transaction context.

All data sources

Search the dated figures used for this view. Each entry identifies its units, reporting period and calculation status.

How to use this page

Use this to check who owns the float and whether insiders are active.

Best for Institutional concentration, insider transaction pattern, and float context.

Weak when Filings are delayed or transactions are administrative rather than economic.

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