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Rambus Inc. (RMBS) Institutional Ownership & Insider Trading History

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

Last confirmed price
$92.75-5.52%
Oct 14, 2026, 3:28 PM EDT · Prices may be delayed
Market cap · calculated
$10.03B
Oct 14, 2026 · Valuation and sources

Data dates

Prices as of Oct 14, 3:28 PM EDT · Fundamentals checked Oct 14, 3:28 PM EDT · Statement period ended Mar 31, 2026

Ownership read

RMBS insider transaction activity: Net selling.

Blackrock Inc. is the largest institutional holder. 46 sales and 0 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

RMBS

Purchases0
Sales365.22K

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

Top holder

13.96M

Blackrock Inc.

Insider transaction activity

Net selling

$33.57M sold / $0.0000 bought

Observations shown

90

10 holder / 80 insider

Holder rows
10
Yahoo Finance · Filing dates shown per row
Increased / initiated
4
6 decreased · provider-reported changes
Insider rows
80
Yahoo Finance · Filing dates shown per row

Ownership concentration and transaction activity

Top 10 reported holders
51.06% 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

These changes cover the holders shown. A holder missing from this list may still own shares. Compare positions from the same reporting quarters.

Net shares sold: 365,216

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.

  • Purchase / sale; plan unknown: 46
  • Grant: 32
  • Gift: 2

Top 10 institutional holders

Rambus Inc. (RMBS) institutional ownership

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

Rambus Inc. (RMBS) institutional ownership
#Institution% heldSharesChange %Position / filing date
1
Blackrock Inc.
12.9%13.96M-14.36%Position as of Jun 30, 2026Filing date unknown
2
FMR, LLC
9.64%10.46M+215.21%Position as of Jun 30, 2026Filing date unknown
3
Invesco Ltd.
6.12%6.63M+2.05%Position as of Jun 30, 2026Filing date unknown
4
Vanguard Portfolio Management LLC
5.60%6.07M-8.67%Position as of Jun 30, 2026Filing date unknown
5
Vanguard Capital Management LLC
4.49%4.87M+0.96%Position as of Jun 30, 2026Filing date unknown
6
State Street Corporation
3.61%3.92M-10.48%Position as of Jun 30, 2026Filing date unknown
7
Price (T.Rowe) Associates Inc
3.07%3.33M-1.25%Position as of Jun 30, 2026Filing date unknown
8
Geode Capital Management, LLC
2.12%2.30M-26.46%Position as of Jun 30, 2026Filing date unknown
9
JPMORGAN CHASE & CO
1.94%2.10M+14.43%Position as of Jun 30, 2026Filing date unknown
10
Dimensional Fund Advisors LP
1.59%1.72M-4.23%Position as of Jun 30, 2026Filing date unknown
Showing 10 of 10 matching institutional rows.

Recent insider transactions

Rambus Inc. (RMBS) Form 4 filings

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

Rambus Inc. (RMBS) Form 4 insider transactions
#Insider% companyActionSharesTransaction date
1
KISSNER CHARLES D
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

5.00KOct 2, 2026
2
KISSNER CHARLES D
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

5.00KSep 22, 2026
3
KISSNER CHARLES D
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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 7, 2026
4
SAYINER NECIP
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

5.00KJun 3, 2026
5
QUANFENG DONG
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

10.00KJun 2, 2026
6
STANG ERIC BRADFORD
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

5.00KJun 1, 2026
7
QUANFENG DONG
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

5.00KMay 26, 2026
8
FAN XIANZHI SEAN
Chief Operating Officer
0.04%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

37.91KMay 26, 2026
9
SHINN JOHN
General Counsel
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

1.00KMay 22, 2026
10
SAYINER NECIP
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

9.82KMay 8, 2026
11
LAUB STEVEN A
Director
<0.01%SaleOpen-market or direct sale reported on Form 4.
Transaction context
Classification:
Purchase / sale; plan unknown
10b5-1:
Not reported
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.

1.50KMay 7, 2026
12
GAGNEJA SUMEET
Chief Financial Officer
0.04%Stock Award(Grant)Transaction code reported in the data source. Check the original Form 4 filing for details.
Transaction context
Classification:
Grant
10b5-1:
Not reported
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.

41.32KMay 1, 2026
Showing 12 of 80 matching Form 4 rows. Percent of company uses current shares outstanding.

Frequently asked

Questions about this quote

Who are the largest RMBS shareholders?

Blackrock Inc. is the largest reported institutional holder of RMBS, with 13.96 million shares, or about 12.88% of shares outstanding.

What does the institutional filing activity show for RMBS?

Rambus Inc. has 10 institutional rows on file: 4 increased or initiated positions and 6 reduced them.

What insider transactions are available for RMBS?

TECHi shows 80 dated RMBS insider transactions through Oct 2, 2026, with transaction types kept separate so administrative actions are not presented as open-market trades.

Are RMBS insiders buying or selling?

The displayed RMBS activity reads Net selling: 46 sales and 0 purchases. Other transaction types remain separate.

Who is the most active reported RMBS insider?

SERAPHIN LUC has the largest absolute share movement in the displayed RMBS filing rows, totaling 525,996 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.

What this page answers

Check who owns the float and whether insiders are active.

Explore Institutional concentration, insider transaction pattern, and float context.

Keep in mind Filings are delayed or transactions are administrative rather than economic.

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