BLACKROCK
Rank #1
15.0%
- Shares
- 16.31M
- Change
- +30.12K
- Change %
- +18.00%
- Filing
- Mar 31, 2026
Increased
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
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.
Ownership read
RMBS insider sentiment: Net selling.
BLACKROCK is the largest loaded institutional holder. 87 sale rows and 0 purchase rows are visible in the loaded Form 4 history. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
RMBS
Purchases—
Sales882.72K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
16.31M
BLACKROCK
Insider stance
Net selling
$76.28M sold / — bought
Latest filing
Jun 3, 2026
Most recent holder or insider filing date
Rows loaded
240
120 holder / 120 insider
- Holder rows
- 120
- Market data feed
- Latest filing
- Jun 3, 2026
- Most recent holder or insider filing date
- Increased / initiated
- 67
- 52 decreased in loaded rows
- Insider rows
- 120
- Market data feed
Top 120 institutional holders
Rambus Inc (RMBS) institutional ownership
Ranked by reported share count, with position changes and latest filing dates where the ownership feed supplies them.
VANGUARD GROUP INC
Rank #2
11.3%
- Shares
- 12.29M
- Change
- -410.84K
- Change %
- -3.23%
- Filing
- Dec 31, 2025
Decreased
VANGUARD PORTFOLIO MANAGEMENT LLC
Rank #3
6.12%
- Shares
- 6.64M
- Change
- +6.64M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
INVESCO LTD.
Rank #4
5.98%
- Shares
- 6.50M
- Change
- +2.35M
- Change %
- +56.65%
- Filing
- Mar 31, 2026
Increased
VANGUARD CAPITAL MANAGEMENT LLC
Rank #5
4.44%
- Shares
- 4.83M
- Change
- +4.83M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
STATE STREET CORP
Rank #6
4.03%
- Shares
- 4.37M
- Change
- +122.05K
- Change %
- +2.87%
- Filing
- Mar 31, 2026
Increased
PRICE T ROWE ASSOCIATES INC
Rank #7
3.11%
- Shares
- 3.38M
- Change
- -2.01M
- Change %
- -37.30%
- Filing
- Mar 31, 2026
Decreased
FMR LLC
Rank #8
3.06%
- Shares
- 3.32M
- Change
- +1.73M
- Change %
- +1.09%
- Filing
- Mar 31, 2026
Increased
GEODE CAPITAL MANAGEMENT
Rank #9
2.88%
- Shares
- 3.12M
- Change
- +281.78K
- Change %
- +9.91%
- Filing
- Mar 31, 2026
Increased
T. ROWE PRICE INVESTMENT MANAGEMENT
Rank #10
2.20%
- Shares
- 2.39M
- Change
- +1.70M
- Change %
- +2.48%
- Filing
- Mar 31, 2026
Increased
EDGEPOINT INVESTMENT GROUP INC.
Rank #11
1.79%
- Shares
- 1.95M
- Change
- +541.06K
- Change %
- +38.46%
- Filing
- Mar 31, 2026
Increased
JPMORGAN CHASE & CO
Rank #12
1.69%
- Shares
- 1.84M
- Change
- -228.84K
- Change %
- -11.08%
- Filing
- Mar 31, 2026
Decreased
DIMENSIONAL FUND ADVISORS LP
Rank #13
1.65%
- Shares
- 1.80M
- Change
- -98.23K
- Change %
- -5.19%
- Filing
- Mar 31, 2026
Decreased
NORGES BANK
Rank #14
1.57%
- Shares
- 1.70M
- Change
- -270.77K
- Change %
- -13.73%
- Filing
- Dec 31, 2025
Decreased
SWEDBANK AB
Rank #15
1.44%
- Shares
- 1.56M
- Change
- +200.00K
- Change %
- +14.67%
- Filing
- Mar 31, 2026
Increased
BANK OF AMERICA CORP
Rank #16
1.25%
- Shares
- 1.36M
- Change
- +111.93K
- Change %
- +8.96%
- Filing
- Mar 31, 2026
Increased
NORTHERN TRUST CORP
Rank #17
1.23%
- Shares
- 1.33M
- Change
- +18.54K
- Change %
- +1.41%
- Filing
- Mar 31, 2026
Increased
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
Rank #18
1.22%
- Shares
- 1.33M
- Change
- -1.29K
- Change %
- -10.00%
- Filing
- Mar 31, 2026
Decreased
NEUBERGER BERMAN GROUP LLC
Rank #19
1.20%
- Shares
- 1.30M
- Change
- -3.78K
- Change %
- -29.00%
- Filing
- Mar 31, 2026
Decreased
CONGRESS ASSET MANAGEMENT CO
Rank #20
1.17%
- Shares
- 1.28M
- Change
- -134.64K
- Change %
- -9.54%
- Filing
- Mar 31, 2026
Decreased
| # | Institution | % held | Shares | Change | Change % | Filing date |
|---|---|---|---|---|---|---|
| 1 | 15.0% | 16.31M | +30.12K Increased | +18.00% | Mar 31, 2026 | |
| 2 | 11.3% | 12.29M | -410.84K Decreased | -3.23% | Dec 31, 2025 | |
| 3 | 6.12% | 6.64M | +6.64M Initiated | — | Mar 31, 2026 | |
| 4 | 5.98% | 6.50M | +2.35M Increased | +56.65% | Mar 31, 2026 | |
| 5 | 4.44% | 4.83M | +4.83M Initiated | — | Mar 31, 2026 | |
| 6 | 4.03% | 4.37M | +122.05K Increased | +2.87% | Mar 31, 2026 | |
| 7 | 3.11% | 3.38M | -2.01M Decreased | -37.30% | Mar 31, 2026 | |
| 8 | 3.06% | 3.32M | +1.73M Increased | +1.09% | Mar 31, 2026 | |
| 9 | 2.88% | 3.12M | +281.78K Increased | +9.91% | Mar 31, 2026 | |
| 10 | 2.20% | 2.39M | +1.70M Increased | +2.48% | Mar 31, 2026 | |
| 11 | EDGEPOINT INVESTMENT GROUP INC. | 1.79% | 1.95M | +541.06K Increased | +38.46% | Mar 31, 2026 |
| 12 | 1.69% | 1.84M | -228.84K Decreased | -11.08% | Mar 31, 2026 | |
| 13 | 1.65% | 1.80M | -98.23K Decreased | -5.19% | Mar 31, 2026 | |
| 14 | 1.57% | 1.70M | -270.77K Decreased | -13.73% | Dec 31, 2025 | |
| 15 | SWEDBANK AB | 1.44% | 1.56M | +200.00K Increased | +14.67% | Mar 31, 2026 |
| 16 | 1.25% | 1.36M | +111.93K Increased | +8.96% | Mar 31, 2026 | |
| 17 | 1.23% | 1.33M | +18.54K Increased | +1.41% | Mar 31, 2026 | |
| 18 | 1.22% | 1.33M | -1.29K Decreased | -10.00% | Mar 31, 2026 | |
| 19 | NEUBERGER BERMAN GROUP LLC | 1.20% | 1.30M | -3.78K Decreased | -29.00% | Mar 31, 2026 |
| 20 | CONGRESS ASSET MANAGEMENT CO | 1.17% | 1.28M | -134.64K Decreased | -9.54% | Mar 31, 2026 |
Showing 20 of 120 matching institutional rows.Load more institutions
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.
SAYINER, NECIP
Director
- Shares
- 5.00K
- % company
- <0.01%
- Price
- $170.15
- Value
- $850,750
Filed Jun 3, 2026
HIGASHI, EMIKO
Director
- Shares
- 5.00K
- % company
- <0.01%
- Price
- $158.00
- Value
- $790,000
Filed Jun 2, 2026
HIGASHI, EMIKO
Director
- Shares
- 5.00K
- % company
- <0.01%
- Price
- $163.00
- Value
- $815,000
Filed Jun 2, 2026
STANG, ERIC B
Director
- Shares
- 5.00K
- % company
- <0.01%
- Price
- $146.00
- Value
- $730,000
Filed Jun 1, 2026
FAN, XIANZHI SEAN
EVP, COO
- Shares
- 37.81K
- % company
- 0.03%
- Price
- $151.69
- Value
- $5,735,991
Filed May 26, 2026
HIGASHI, EMIKO
Director
- Shares
- 5.00K
- % company
- <0.01%
- Price
- $157.57
- Value
- $787,851
Filed May 26, 2026
FAN, XIANZHI SEAN
EVP, COO
- Shares
- 100
- % company
- <0.01%
- Price
- $152.35
- Value
- $15,235
Filed May 26, 2026
SHINN, JOHN
SVP, General Counsel
- Shares
- 1.00K
- % company
- <0.01%
- Price
- $143.63
- Value
- $143,630
Filed May 22, 2026
SAYINER, NECIP
Director
- Shares
- 9.82K
- % company
- <0.01%
- Price
- $130.18
- Value
- $1,278,888
Filed May 8, 2026
LAUB, STEVEN
Director
- Shares
- 1.50K
- % company
- <0.01%
- Price
- $125.52
- Value
- $188,279
Filed May 7, 2026
GAGNEJA, SUMEET
SVP, CFO
- Shares
- 14.52K
- % company
- 0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 1, 2026
GAGNEJA, SUMEET
SVP, CFO
- Shares
- 26.80K
- % company
- 0.02%
- Price
- No cash value
- Value
- No cash value
Filed May 1, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | SAYINER, NECIP Director | <0.01% | Sale to issuer | 5.00K | $170.15 | $850,750 | Jun 3, 2026 |
| 2 | HIGASHI, EMIKO Director | <0.01% | Sale to issuer | 5.00K | $158.00 | $790,000 | Jun 2, 2026 |
| 3 | HIGASHI, EMIKO Director | <0.01% | Sale to issuer | 5.00K | $163.00 | $815,000 | Jun 2, 2026 |
| 4 | STANG, ERIC B Director | <0.01% | Sale to issuer | 5.00K | $146.00 | $730,000 | Jun 1, 2026 |
| 5 | FAN, XIANZHI SEAN EVP, COO | 0.03% | Sale to issuer | 37.81K | $151.69 | $5,735,991 | May 26, 2026 |
| 6 | HIGASHI, EMIKO Director | <0.01% | Sale to issuer | 5.00K | $157.57 | $787,851 | May 26, 2026 |
| 7 | FAN, XIANZHI SEAN EVP, COO | <0.01% | Sale to issuer | 100 | $152.35 | $15,235 | May 26, 2026 |
| 8 | SHINN, JOHN SVP, General Counsel | <0.01% | Sale to issuer | 1.00K | $143.63 | $143,630 | May 22, 2026 |
| 9 | SAYINER, NECIP Director | <0.01% | Sale to issuer | 9.82K | $130.18 | $1,278,888 | May 8, 2026 |
| 10 | LAUB, STEVEN Director | <0.01% | Sale to issuer | 1.50K | $125.52 | $188,279 | May 7, 2026 |
| 11 | GAGNEJA, SUMEET SVP, CFO | 0.01% | Award / grant | 14.52K | No cash value | No cash value | May 1, 2026 |
| 12 | GAGNEJA, SUMEET SVP, CFO | 0.02% | Award / grant | 26.80K | No cash value | No cash value | May 1, 2026 |
Showing 12 of 120 matching Form 4 rows. Percent of company uses current shares outstanding when available.Load more insiders
Frequently asked
Common questions.
Who are the largest RMBS shareholders?
BLACKROCK is the largest institutional holder in the loaded RMBS ownership feed, with 16.31 million shares, or about 15.01% of shares outstanding. The table ranks additional institutions by reported share count.
What is institutional ownership of RMBS?
The current TECHi snapshot has 120 loaded institutional rows for Rambus Inc. 67 rows are marked increased or initiated, while 52 rows are marked decreased, with the latest holder filing dated Mar 31, 2026.
Where can I see Rambus Inc insider transactions?
The insider transaction table currently shows 120 loaded Form 4 rows for RMBS, with the latest insider filing dated Jun 3, 2026. It separates purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are not confused with open-market trades.
Are RMBS insiders buying or selling?
The loaded RMBS Form 4 rows currently read Net selling: 87 sale rows and 0 purchase rows. Awards, gifts, conversions, and tax withholding are shown separately because they do not carry the same signal as open-market buying or selling.
Who is the most active RMBS insider in the loaded filings?
SERAPHIN, LUC is the most active insider by absolute share movement in the loaded RMBS rows, with 779,643 shares moving across the visible filing history. Review the action labels before treating that activity as buying or selling.