NASDAQ · Technology · Holders
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
- $85.65-0.09%
- Oct 23, 2026, 4:00 PM EDT · Prices may be delayed
Data dates
Prices as of Oct 23, 4:00 PM EDT · Fundamentals checked Oct 24, 2:44 AM EDT · Statement period ended Mar 31, 2026
Ownership read
RMBS insider transaction activity: Net selling.
Blackrock Inc. is the largest institutional holder. 46 classified sales and 0 classified purchases appear in the recent insider records. Use the filters below to separate open-market activity from option exercises, gifts, awards, and tax withholding.
Insider flow
RMBS
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
- Increased / initiated
- Unavailable
- Prior positions were not supplied
- Insider rows
- 80
- Transaction 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
- Prior-position data unavailable
- 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.
| # | Institution | % held | Shares | Position / filing date |
|---|---|---|---|---|
| 1 | 12.9% | 13.96M | Position as of Jun 30, 2026Filing date unknown | |
| 2 | 9.64% | 10.46M | Position as of Jun 30, 2026Filing date unknown | |
| 3 | 6.12% | 6.63M | Position as of Jun 30, 2026Filing date unknown | |
| 4 | 5.60% | 6.07M | Position as of Jun 30, 2026Filing date unknown | |
| 5 | 4.49% | 4.87M | Position as of Jun 30, 2026Filing date unknown | |
| 6 | 3.61% | 3.92M | Position as of Jun 30, 2026Filing date unknown | |
| 7 | 3.07% | 3.33M | Position as of Jun 30, 2026Filing date unknown | |
| 8 | 2.12% | 2.30M | Position as of Jun 30, 2026Filing date unknown | |
| 9 | 1.94% | 2.10M | Position as of Jun 30, 2026Filing date unknown | |
| 10 | 1.59% | 1.72M | Position as of Jun 30, 2026Filing date unknown |
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. Window: Dec 12, 2024–Oct 2, 2026 · 80 records.
| # | Insider | % company | Action | Shares | Price | Value | Transaction / filing |
|---|---|---|---|---|---|---|---|
| 1 | KISSNER CHARLES D Director | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 5.00K | $111.00 | $555,000 | Oct 2, 2026Filing date unavailableOriginal filing link unavailable |
| 2 | KISSNER CHARLES D Director | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 5.00K | $105.00 | $525,000 | Sep 22, 2026Filing date unavailableOriginal filing link unavailable |
| 3 | KISSNER CHARLES D Director | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 5.00K | $100.92 | $504,600 | Aug 7, 2026Filing date unavailableOriginal filing link unavailable |
| 4 | SAYINER NECIP Director | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 5.00K | $170.15 | $850,750 | Jun 3, 2026Filing date unavailableOriginal filing link unavailable |
| 5 | QUANFENG DONG Director | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 10.00K | $160.50 | $1,605,000 | Jun 2, 2026Filing date unavailableOriginal filing link unavailable |
| 6 | STANG ERIC BRADFORD Director | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 5.00K | $146.00 | $730,000 | Jun 1, 2026Filing date unavailableOriginal filing link unavailable |
| 7 | FAN XIANZHI SEAN Chief Operating Officer | 0.04% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 37.91K | $151.69 | $5,751,226 | May 26, 2026Filing date unavailableOriginal filing link unavailable |
| 8 | QUANFENG DONG Director | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 5.00K | $157.57 | $787,850 | May 26, 2026Filing date unavailableOriginal filing link unavailable |
| 9 | SHINN JOHN General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 1.00K | $143.63 | $143,630 | May 22, 2026Filing date unavailableOriginal filing link unavailable |
| 10 | SAYINER NECIP Director | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 9.82K | $130.18 | $1,278,888 | May 8, 2026Filing date unavailableOriginal filing link unavailable |
| 11 | LAUB STEVEN A Director | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 1.50K | $125.52 | $188,279 | May 7, 2026Filing date unavailableOriginal filing link unavailable |
| 12 | GAGNEJA SUMEET Chief Financial Officer | 0.04% | Award / grantAward, grant, or acquisition under an equity compensation plan.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 41.32K | No cash value | No cash value | May 1, 2026Filing date unavailableOriginal filing link unavailable |
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. Previous position sizes are unavailable, so increases and reductions cannot be determined.
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.
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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