Rambus Inc
RMBS- Exchange
- Nasdaq
- Industry
- Semiconductors & Related Devices
- SEC CIK
- 0000917273
In the last 90 days, Rambus Inc insiders filed 0 open-market purchases and 2 sales; 621 institutions reported holding it in 13F filings for Q2 2026, worth $13.3B in total; superinvestors Duquesne Family Office and Maverick Capital hold it.
13F holders, Q4 2025
Institutional positions in Rambus Inc as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 554
- +50 vs. Q3 2025
- Shares held
- 99.8M
- +1.42M (+1.4%) vs. Q3 2025
- Total value
- $9.18B
- −$1.08B (−10.5%) vs. Q3 2025
- New holders
- 103
- 190 more added
- Sold out
- 53
- 195 more reduced
9 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting RMBS on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 621 | $13.3B |
| Q1 2026 | 557 | $8.83B |
| Q4 2025 | 554 | $9.18B |
| Q3 2025 | 513 | $10.3B |
| Q2 2025 | 459 | $6.22B |
| Q1 2025 | 413 | $5.01B |
| Q4 2024 | 395 | $5.03B |
| Q3 2024 | 376 | $3.94B |
| Q2 2024 | 363 | $5.64B |
| Q1 2024 | 375 | $6.00B |
| Q4 2023 | 400 | $6.62B |
| Q3 2023 | 350 | $5.48B |
| Q2 2023 | 393 | $6.14B |
| Q1 2023 | 337 | $4.81B |
| Q4 2022 | 303 | $3.27B |
| Q3 2022 | 241 | $2.38B |
| Q2 2022 | 253 | $2.07B |
| Q1 2022 | 276 | $2.98B |
| Q4 2021 | 258 | $2.80B |
| Q3 2021 | 236 | $2.07B |
| Q2 2021 | 219 | $2.30B |
| Q1 2021 | 213 | $1.86B |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Rambus Inc; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Lazard Asset Management LLC | 297,870 | $27.4M | 0.05% | −1,058−0.4% | Reduced |
| First Trust Advisors LP | 300,156 | $27.6M | 0.02% | +99,611+49.7% | Added |
| Public Sector Pension Investment Board | 305,209 | $28.0M | 0.09% | +305,209 | New |
| Rhumbline Advisers | 314,612 | $28.9M | 0.02% | −29,775−8.6% | Reduced |
| William Blair Investment Management, LLC | 316,397 | $29.1M | 0.08% | +25,215+8.7% | Added |
| Westfield Capital Management Co LP | 362,092 | $33.3M | 0.14% | −122,373−25.3% | Reduced |
| Janus Henderson Group PLC | 379,515 | $34.9M | 0.02% | −4,489−1.2% | Reduced |
| SEI Investments Co | 386,745 | $35.5M | 0.04% | +106,192+37.9% | Added |
| Emerald Mutual Fund Advisers Trust | 391,215 | $35.9M | 1.75% | 00.0% | Unchanged |
| Principal Financial Group Inc | 411,719 | $37.8M | 0.02% | −61,255−13.0% | Reduced |
| Panagora Asset Management Inc | 434,703 | $39.9M | 0.14% | −3,414−0.8% | Reduced |
| Caisse de Depot Et Placement du Quebec | 447,309 | $41.1M | 0.07% | +66,705+17.5% | Added |
| UBS Group AG | 455,670 | $41.9M | 0.01% | −110,135−19.5% | Reduced |
| Oberweis Asset Management Inc | 462,100 | $42.5M | 1.55% | −45,799−9.0% | Reduced |
| Canada Pension Plan Investment Board | 466,600 | $42.9M | 0.03% | +212,000+83.3% | Added |
| Franklin Resources Inc | 485,805 | $44.6M | 0.01% | +13,456+2.8% | Added |
| Citigroup Inc | 502,540 | $46.2M | 0.03% | +132,199+35.7% | Added |
| Fisher Asset Management, LLC | 517,278 | $47.5M | 0.02% | +364,396+238.4% | Added |
| Lord, Abbett & Co. LLC | 539,028 | $49.5M | 0.15% | −207,648−27.8% | Reduced |
| Allspring Global Investments Holdings, LLC | 522,226 | $51.8M | 0.08% | +26,773+5.4% | Added |
| Ameriprise Financial Inc | 566,679 | $52.1M | 0.01% | +106,575+23.2% | Added |
| Emerald Advisers, LLC | 626,985 | $57.6M | 1.78% | −10,769−1.7% | Reduced |
| T. Rowe Price Investment Management, Inc. | 687,840 | $63.2M | 0.04% | −41,207−5.7% | Reduced |
| Loomis Sayles & Co L P | 700,333 | $64.4M | 0.08% | +90,180+14.8% | Added |
| Hood River Capital Management LLC | 708,846 | $65.1M | 0.71% | −129,594−15.5% | Reduced |
| AQR Capital Management LLC | 711,126 | $65.3M | 0.03% | +163,522+29.9% | Added |
| Voya Investment Management LLC | 724,208 | $66.5M | 0.07% | −44,330−5.8% | Reduced |
| Morgan Stanley | 885,092 | $81.3M | 0.00% | −180,712−17.0% | Reduced |
| Wellington Management Group LLP | 933,934 | $85.8M | 0.02% | +183,488+24.5% | Added |
| Rafferty Asset Management, LLC | 935,784 | $86.0M | 0.30% | +34,034+3.8% | Added |
| Raymond James Financial Inc | 932,281 | $87.1M | 0.03% | −258,039−21.7% | Reduced |
| Driehaus Capital Management LLC | 954,164 | $87.7M | 0.60% | +954,164 | New |
| Barclays PLC | 1,022,984 | $94.0M | 0.04% | +128,078+14.3% | Added |
| Bank of New York Mellon Corp | 1,094,156 | $100.5M | 0.02% | −504,182−31.5% | Reduced |
| Nuveen, LLC | 1,102,090 | $101.3M | 0.03% | −181,035−14.1% | Reduced |
| Goldman Sachs Group Inc | 1,194,391 | $109.8M | 0.02% | +7,258+0.6% | Added |
| Bank of America Corp | 1,249,642 | $114.8M | 0.01% | −301,023−19.4% | Reduced |
| Neuberger Berman Group LLC | 1,305,951 | $120.1M | 0.09% | −176,057−11.9% | Reduced |
| Northern Trust Corp | 1,315,551 | $120.9M | 0.02% | −70,323−5.1% | Reduced |
| Charles Schwab Investment Management Inc | 1,327,693 | $122.0M | 0.02% | −11,221−0.8% | Reduced |
| Swedbank AB | 1,363,000 | $125.2M | 0.12% | −337,000−19.8% | Reduced |
| EdgePoint Investment Group Inc. | 1,406,686 | $129.3M | 1.06% | −1,276,270−47.6% | Reduced |
| Congress Asset Management Co | 1,410,615 | $129.6M | 0.91% | +63,430+4.7% | Added |
| FMR LLC | 1,587,029 | $145.8M | 0.01% | +213,505+15.5% | Added |
| Norges Bank | 1,701,551 | $156.4M | 0.02% | +1,701,551 | New |
| Dimensional Fund Advisors LP | 1,893,528 | $174.0M | 0.04% | −35,169−1.8% | Reduced |
| Alliancebernstein L.P. | 1,900,308 | $174.6M | 0.06% | +78,278+4.3% | Added |
| JPMorgan Chase & Co | 2,065,343 | $189.8M | 0.01% | −491,495−19.2% | Reduced |
| Geode Capital Management, LLC | 2,842,715 | $261.3M | 0.02% | +94,214+3.4% | Added |
| Invesco Ltd. | 4,148,653 | $381.2M | 0.04% | +1,716,621+70.6% | Added |
| State Street Corp | 4,251,563 | $390.7M | 0.01% | −138,422−3.2% | Reduced |
| Price T Rowe Associates Inc | 5,385,570 | $494.9M | 0.05% | +140,226+2.7% | Added |
| Vanguard Group Inc | 12,290,929 | $1.13B | 0.02% | −410,844−3.2% | Reduced |
| BlackRock, Inc. | 16,275,186 | $1.50B | 0.03% | +466,493+3.0% | Added |
| Analog Century Management LP | 0 | $0 | 0.00% | −631,343−100.0% | Sold out |
| Healthcare of Ontario Pension Plan Trust Fund | 0 | $0 | 0.00% | −200,000−100.0% | Sold out |
| Arrowstreet Capital, Limited Partnership | 0 | $0 | 0.00% | −173,353−100.0% | Sold out |
| CloudAlpha Capital Management Limited/Hong Kong | 0 | $0 | 0.00% | −165,800−100.0% | Sold out |
| Tairen Capital Ltd | 0 | $0 | 0.00% | −103,073−100.0% | Sold out |
| Lisanti Capital Growth, LLC | 0 | $0 | 0.00% | −41,532−100.0% | Sold out |
| Penserra Capital Management LLC | 0 | $0 | 0.00% | −34,162−100.0% | Sold out |
| Capital Fund Management S.A. | 0 | $0 | 0.00% | −29,371−100.0% | Sold out |
| Nomura Holdings Inc | 0 | $0 | 0.00% | −27,046−100.0% | Sold out |
| Jackson Creek Investment Advisors LLC | 0 | $0 | 0.00% | −23,920−100.0% | Sold out |
| IMC-Chicago, LLC | 0 | $0 | 0.00% | −20,443−100.0% | Sold out |
| Zacks Investment Management | 0 | $0 | 0.00% | −19,110−100.0% | Sold out |
| Cinctive Capital Management LP | 0 | $0 | 0.00% | −16,315−100.0% | Sold out |
| Baader Bank INC | 0 | $0 | 0.00% | −11,042−100.0% | Sold out |
| Hussman Strategic Advisors, Inc. | 0 | $0 | 0.00% | −10,500−100.0% | Sold out |
| Unique Wealth Strategies, LLC | 0 | $0 | 0.00% | −8,025−100.0% | Sold out |
| Beacon Pointe Advisors, LLC | 0 | $0 | 0.00% | −7,500−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −6,221−100.0% | Sold out |
| Neo Ivy Capital Management | 0 | $0 | 0.00% | −5,770−100.0% | Sold out |
| Polymer Capital Management (US) LLC | 0 | $0 | 0.00% | −5,374−100.0% | Sold out |
| K.J. Harrison & Partners Inc | 0 | $0 | 0.00% | −5,000−100.0% | Sold out |
| Empowered Funds, LLC | 0 | $0 | 0.00% | −4,450−100.0% | Sold out |
| WBI Investments | 0 | $0 | 0.00% | −4,356−100.0% | Sold out |
| Atom Investors LP | 0 | $0 | 0.00% | −4,292−100.0% | Sold out |
| NJ State Employees Deferred Compensation Plan | 0 | $0 | 0.00% | −4,000−100.0% | Sold out |
| Massar Capital Management, LP | 0 | $0 | 0.00% | −3,600−100.0% | Sold out |
| Mitsubishi UFJ Trust & Banking Corp | 0 | $0 | 0.00% | −2,784−100.0% | Sold out |
| Requisite Capital Management, LLC | 0 | $0 | 0.00% | −2,522−100.0% | Sold out |
| Blue Barn Wealth, LLC | 0 | $0 | 0.00% | −2,500−100.0% | Sold out |
| Keel Point, LLC | 0 | $0 | 0.00% | −2,430−100.0% | Sold out |
| St Germain D J Co Inc | 0 | $0 | 0.00% | −2,245−100.0% | Sold out |
| NewEdge Wealth, LLC | 0 | $0 | 0.00% | −2,037−100.0% | Sold out |
| Hilltop Holdings Inc. | 0 | $0 | 0.00% | −2,049−100.0% | Sold out |
| DRW Securities, LLC | 0 | $0 | 0.00% | −2,026−100.0% | Sold out |
| Johnson Investment Counsel Inc | 0 | $0 | 0.00% | −1,986−100.0% | Sold out |
| Juncture Wealth Strategies, LLC | 0 | $0 | 0.00% | −1,980−100.0% | Sold out |
| Chase Investment Counsel Corp | 0 | $0 | 0.00% | −1,973−100.0% | Sold out |
| Oppenheimer Asset Management Inc. | 0 | $0 | 0.00% | −1,928−100.0% | Sold out |
| Picton Mahoney Asset Management | 0 | $0 | 0.00% | −1,285−100.0% | Sold out |
| Wexford Capital LP | 0 | $0 | 0.00% | −999−100.0% | Sold out |
| Principal Securities, Inc. | 0 | $0 | 0.00% | −730−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −685−100.0% | Sold out |
| Ci Investments Inc. | 0 | $0 | 0.00% | −661−100.0% | Sold out |
| Credit Industriel Et Commercial | 0 | $0 | 0.00% | −505−100.0% | Sold out |
| Rise Advisors, LLC | 0 | $0 | 0.00% | −405−100.0% | Sold out |
| Wealthspire Advisors, LLC | 0 | $0 | 0.00% | −323−100.0% | Sold out |