Latest Period
Q1 2026
Security Snapshot
RAMBUS INC - COMMON STOCK (RMBS) Institutional Ownership
CUSIP: 750917106
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
553
Shares (Excl. Options)
102,770,629
Price
$86.03
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- Security type / class
- Equity / COMMON STOCK
- Symbol
- RMBS on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 102,770,629
- Total 13F value
- $8,824,182,039
- Portfolio coverage rank
- 0.01%
- Share change
- +2,841,311
- Value change
- +$214,301,664
- Number of holders
- 553
- Shares outstanding
- 108,623,027
- SEC-reported price per share
- $148.66
- Insider filing price
- $148.66
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- RMBS - RAMBUS INC - COMMON STOCK is tracked under CUSIP 750917106.
- 553 institutions reported positions in Q1 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 554 to 553 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $9,179,564,312 to $8,824,182,039.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 553 institutions filings for Q1 2026.
Security key
750917106
Latest holder period
Q1 2026
13F holders
553
13D/G owners
6
CIK / CUSIP context first
Open Q1 2026 holders
RMBS full holder history
RAMBUS INC SEC filings
RAMBUS INC company facts
RAMBUS INC insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 750917106:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
RMBS
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 14% | $1,383,886,224 | 15,060,232 | BlackRock, Inc. | 31 Dec 2025 | |||
| FMR LLC | 10% | $1,523,372,780 | 11,296,795 | FMR LLC | 29 May 2026 | |||
| VANGUARD PORTFOLIO MANAGEMENT LLC | 6.2% | $580,054,178 | 6,742,464 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| Invesco Ltd. | 6% | $717,754,861 | 6,499,048 | Invesco Ltd. | 31 Mar 2026 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.2% | $486,204,395 | 5,651,568 | Vanguard Capital Management | 31 Mar 2026 | |||
| PRICE T ROWE ASSOCIATES INC /MD/ | 3.1% | -38% | $372,852,508 | -$221,933,487 | 3,376,064 | -37% | T. Rowe Price Associates, Inc. | 31 Mar 2026 |
As of 31 Mar 2026, 553 institutional investors reported holding 102,770,629 shares of RAMBUS INC - COMMON STOCK (RMBS). This represents 95% of the company’s total 108,623,027 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
66%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 15% | 16,305,306 | +0.19% | 0.02% | $1,402,745,519 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 6.1% | 6,644,320 | 0% | 0.03% | $571,610,850 |
| Invesco Ltd. | 6% | 6,499,048 | +57% | 0.09% | $559,113,102 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.4% | 4,827,854 | 0% | 0.01% | $415,340,280 |
| STATE STREET CORP | 4% | 4,373,617 | +2.9% | 0.01% | $376,262,271 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 3.1% | 3,376,689 | -37% | 0.03% | $290,498,000 |
| FMR LLC | 3.1% | 3,318,449 | +109% | 0.02% | $285,486,134 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.9% | 3,124,495 | +9.9% | 0.02% | $268,843,262 |
| T. Rowe Price Investment Management, Inc. | 2.2% | 2,391,020 | +248% | 0.14% | $205,700,000 |
| EdgePoint Investment Group Inc. | 1.8% | 1,947,742 | +38% | 1.3% | $167,564,244 |
| JPMORGAN CHASE & CO | 1.7% | 1,836,500 | -11% | 0.01% | $146,424,147 |
| DIMENSIONAL FUND ADVISORS LP | 1.7% | 1,795,295 | -5.2% | 0.03% | $154,417,340 |
| Swedbank AB | 1.4% | 1,563,000 | +15% | 0.14% | $134,464,890 |
| BANK OF AMERICA CORP /DE/ | 1.3% | 1,361,570 | +9% | 0.01% | $117,135,866 |
| NORTHERN TRUST CORP | 1.2% | 1,334,095 | +1.4% | 0.02% | $114,772,192 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.2% | 1,326,402 | -0.1% | 0.02% | $114,110,364 |
| NEUBERGER BERMAN GROUP LLC | 1.2% | 1,302,169 | -0.29% | 0.09% | $111,719,586 |
| CONGRESS ASSET MANAGEMENT CO | 1.2% | 1,275,978 | -9.5% | 0.79% | $109,772,387 |
| AQR CAPITAL MANAGEMENT LLC | 1.2% | 1,250,456 | +76% | 0.05% | $103,962,871 |
| MORGAN STANLEY | 1.1% | 1,213,197 | +37% | 0.01% | $104,371,458 |
| BARCLAYS PLC | 1% | 1,095,701 | +7.1% | 0.03% | $94,263,156 |
| BESSEMER GROUP INC | 0.96% | 1,039,905 | +1009% | 0.14% | $89,463,000 |
| CITIGROUP INC | 0.93% | 1,007,548 | +100% | 0.06% | $86,679,354 |
| AMERIPRISE FINANCIAL INC | 0.9% | 975,209 | +72% | 0.02% | $83,895,612 |
| UBS Group AG | 0.88% | 956,387 | +110% | 0.01% | $82,277,975 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 102,770,629 | $8,824,182,039 | +$214,301,664 | $86.03 | 553 |
| 2025 Q4 | 99,840,591 | $9,179,564,312 | +$54,153,981 | $91.89 | 554 |
| 2025 Q3 | 98,720,954 | $10,287,013,170 | +$329,370,913 | $104.20 | 508 |
| 2025 Q2 | 97,175,851 | $6,221,678,375 | +$55,183,928 | $64.02 | 454 |
| 2025 Q1 | 96,333,210 | $4,988,963,649 | +$67,491,508 | $51.78 | 407 |
| 2024 Q4 | 95,008,872 | $5,022,794,265 | +$134,234,343 | $52.86 | 388 |
| 2024 Q3 | 92,291,982 | $3,897,859,273 | -$134,755,356 | $42.22 | 366 |
| 2024 Q2 | 96,165,643 | $5,648,162,967 | -$55,372,554 | $58.76 | 360 |
| 2024 Q1 | 96,963,181 | $5,982,121,446 | -$4,927,304 | $61.81 | 372 |
| 2023 Q4 | 96,952,912 | $6,617,035,509 | -$48,558,518 | $68.25 | 393 |
| 2023 Q3 | 98,159,619 | $5,476,899,149 | +$107,718,089 | $55.79 | 346 |
| 2023 Q2 | 95,388,175 | $6,120,379,053 | +$115,519,537 | $64.17 | 387 |
| 2023 Q1 | 93,847,033 | $4,809,816,902 | +$165,414,108 | $51.26 | 330 |
| 2022 Q4 | 91,262,173 | $3,269,593,067 | -$57,969,038 | $35.82 | 298 |
| 2022 Q3 | 93,543,335 | $2,378,168,249 | -$64,449,169 | $25.42 | 231 |
| 2022 Q2 | 96,128,813 | $2,066,646,677 | +$42,078,444 | $21.49 | 242 |
| 2022 Q1 | 93,594,821 | $2,980,992,723 | -$56,899,496 | $31.89 | 263 |
| 2021 Q4 | 95,124,067 | $2,794,059,734 | +$65,910,581 | $29.39 | 248 |
| 2021 Q3 | 93,314,238 | $2,071,337,938 | -$74,736,458 | $22.20 | 229 |
| 2021 Q2 | 97,063,344 | $2,300,634,115 | +$38,471,787 | $23.71 | 215 |
| 2021 Q1 | 95,752,564 | $1,861,230,562 | +$2,038,981 | $19.44 | 207 |
| 2020 Q4 | 95,947,500 | $1,675,889,341 | +$40,079,526 | $17.46 | 212 |
| 2020 Q3 | 95,116,912 | $1,302,181,717 | -$10,592,348 | $13.69 | 182 |
| 2020 Q2 | 95,342,666 | $1,448,975,078 | +$22,552,264 | $15.20 | 194 |
| 2020 Q1 | 94,020,413 | $1,043,785,850 | -$5,966,355 | $11.10 | 172 |