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; 620 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 | 620 | $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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 16,275,186 | $1.50B | 0.03% | +466,493+3.0% | Added |
| Vanguard Group Inc | 12,290,929 | $1.13B | 0.02% | −410,844−3.2% | Reduced |
| Price T Rowe Associates Inc | 5,385,570 | $494.9M | 0.05% | +140,226+2.7% | Added |
| State Street Corp | 4,251,563 | $390.7M | 0.01% | −138,422−3.2% | Reduced |
| Invesco Ltd. | 4,148,653 | $381.2M | 0.04% | +1,716,621+70.6% | Added |
| Geode Capital Management, LLC | 2,842,715 | $261.3M | 0.02% | +94,214+3.4% | Added |
| JPMorgan Chase & Co | 2,065,343 | $189.8M | 0.01% | −491,495−19.2% | Reduced |
| Alliancebernstein L.P. | 1,900,308 | $174.6M | 0.06% | +78,278+4.3% | Added |
| Dimensional Fund Advisors LP | 1,893,528 | $174.0M | 0.04% | −35,169−1.8% | Reduced |
| Norges Bank | 1,701,551 | $156.4M | 0.02% | +1,701,551 | New |
| FMR LLC | 1,587,029 | $145.8M | 0.01% | +213,505+15.5% | Added |
| Congress Asset Management Co | 1,410,615 | $129.6M | 0.91% | +63,430+4.7% | Added |
| EdgePoint Investment Group Inc. | 1,406,686 | $129.3M | 1.06% | −1,276,270−47.6% | Reduced |
| Swedbank AB | 1,363,000 | $125.2M | 0.12% | −337,000−19.8% | Reduced |
| Charles Schwab Investment Management Inc | 1,327,693 | $122.0M | 0.02% | −11,221−0.8% | Reduced |
| Northern Trust Corp | 1,315,551 | $120.9M | 0.02% | −70,323−5.1% | Reduced |
| Neuberger Berman Group LLC | 1,305,951 | $120.1M | 0.09% | −176,057−11.9% | Reduced |
| Bank of America Corp | 1,249,642 | $114.8M | 0.01% | −301,023−19.4% | Reduced |
| Goldman Sachs Group Inc | 1,194,391 | $109.8M | 0.02% | +7,258+0.6% | Added |
| Nuveen, LLC | 1,102,090 | $101.3M | 0.03% | −181,035−14.1% | Reduced |
| Bank of New York Mellon Corp | 1,094,156 | $100.5M | 0.02% | −504,182−31.5% | Reduced |
| Barclays PLC | 1,022,984 | $94.0M | 0.04% | +128,078+14.3% | Added |
| Driehaus Capital Management LLC | 954,164 | $87.7M | 0.60% | +954,164 | New |
| Raymond James Financial Inc | 932,281 | $87.1M | 0.03% | −258,039−21.7% | Reduced |
| Rafferty Asset Management, LLC | 935,784 | $86.0M | 0.30% | +34,034+3.8% | Added |
| Wellington Management Group LLP | 933,934 | $85.8M | 0.02% | +183,488+24.5% | Added |
| Morgan Stanley | 885,092 | $81.3M | 0.00% | −180,712−17.0% | Reduced |
| Voya Investment Management LLC | 724,208 | $66.5M | 0.07% | −44,330−5.8% | Reduced |
| AQR Capital Management LLC | 711,126 | $65.3M | 0.03% | +163,522+29.9% | Added |
| Hood River Capital Management LLC | 708,846 | $65.1M | 0.71% | −129,594−15.5% | Reduced |
| Loomis Sayles & Co L P | 700,333 | $64.4M | 0.08% | +90,180+14.8% | Added |
| T. Rowe Price Investment Management, Inc. | 687,840 | $63.2M | 0.04% | −41,207−5.7% | Reduced |
| Emerald Advisers, LLC | 626,985 | $57.6M | 1.78% | −10,769−1.7% | Reduced |
| Ameriprise Financial Inc | 566,679 | $52.1M | 0.01% | +106,575+23.2% | Added |
| Allspring Global Investments Holdings, LLC | 522,226 | $51.8M | 0.08% | +26,773+5.4% | Added |
| Lord, Abbett & Co. LLC | 539,028 | $49.5M | 0.15% | −207,648−27.8% | Reduced |
| Fisher Asset Management, LLC | 517,278 | $47.5M | 0.02% | +364,396+238.4% | Added |
| Citigroup Inc | 502,540 | $46.2M | 0.03% | +132,199+35.7% | Added |
| Franklin Resources Inc | 485,805 | $44.6M | 0.01% | +13,456+2.8% | Added |
| Canada Pension Plan Investment Board | 466,600 | $42.9M | 0.03% | +212,000+83.3% | Added |
| Oberweis Asset Management Inc | 462,100 | $42.5M | 1.55% | −45,799−9.0% | Reduced |
| UBS Group AG | 455,670 | $41.9M | 0.01% | −110,135−19.5% | Reduced |
| Caisse de Depot Et Placement du Quebec | 447,309 | $41.1M | 0.07% | +66,705+17.5% | Added |
| Panagora Asset Management Inc | 434,703 | $39.9M | 0.14% | −3,414−0.8% | Reduced |
| Principal Financial Group Inc | 411,719 | $37.8M | 0.02% | −61,255−13.0% | Reduced |
| Emerald Mutual Fund Advisers Trust | 391,215 | $35.9M | 1.75% | 00.0% | Unchanged |
| SEI Investments Co | 386,745 | $35.5M | 0.04% | +106,192+37.9% | Added |
| Janus Henderson Group PLC | 379,515 | $34.9M | 0.02% | −4,489−1.2% | Reduced |
| Westfield Capital Management Co LP | 362,092 | $33.3M | 0.14% | −122,373−25.3% | Reduced |
| William Blair Investment Management, LLC | 316,397 | $29.1M | 0.08% | +25,215+8.7% | Added |
| Rhumbline Advisers | 314,612 | $28.9M | 0.02% | −29,775−8.6% | Reduced |
| Public Sector Pension Investment Board | 305,209 | $28.0M | 0.09% | +305,209 | New |
| First Trust Advisors LP | 300,156 | $27.6M | 0.02% | +99,611+49.7% | Added |
| Lazard Asset Management LLC | 297,870 | $27.4M | 0.05% | −1,058−0.4% | Reduced |
| Westwood Holdings Group Inc. | 285,073 | $26.2M | 0.21% | +50,016+21.3% | Added |
| ArrowMark Colorado Holdings LLC | 272,010 | $25.0M | 0.55% | +272,010 | New |
| Granahan Investment Management Inc | 265,516 | $24.4M | 1.04% | +27,073+11.4% | Added |
| Millennium Management LLC | 262,578 | $24.1M | 0.02% | +65,346+33.1% | Added |
| Silvercrest Asset Management Group LLC | 249,986 | $23.0M | 0.16% | −214,903−46.2% | Reduced |
| BNP Paribas Arbitrage, SA | 246,494 | $22.7M | 0.01% | +81,183+49.1% | Added |
| UBS Asset Management Americas Inc | 244,344 | $22.5M | 0.00% | −9,562−3.8% | Reduced |
| MetLife Investment Management | 240,162 | $22.1M | 0.11% | −5,650−2.3% | Reduced |
| Advisor Group Holdings, Inc. | 217,072 | $19.9M | 0.03% | −7,583−3.4% | Reduced |
| Wells Fargo & Company | 216,914 | $19.9M | 0.00% | +35,934+19.9% | Added |
| Nomura Asset Management International Inc. | 216,867 | $19.9M | 0.03% | +216,867 | New |
| Prudential Financial Inc | 213,642 | $19.6M | 0.02% | −7,379−3.3% | Reduced |
| Swiss National Bank | 212,200 | $19.5M | 0.01% | +4,000+1.9% | Added |
| Algert Global LLC | 202,222 | $18.6M | 0.29% | +79,835+65.2% | Added |
| California Public Employees Retirement System | 196,207 | $18.0M | 0.01% | +116+0.1% | Added |
| Stephens Investment Management Group LLC | 193,702 | $17.8M | 0.23% | +311+0.2% | Added |
| Schwartz Investment Counsel Inc | 180,337 | $16.6M | 0.58% | −50,000−21.7% | Reduced |
| WCM Investment Management, LLC | 172,366 | $16.3M | 0.03% | −126,514−42.3% | Reduced |
| Legal & General Group Plc | 177,596 | $16.3M | 0.00% | −42,118−19.2% | Reduced |
| Glenmede Trust Co NA | 172,534 | $15.9M | 0.08% | +172,534 | New |
| Citadel Advisors LLC | 169,902 | $15.6M | 0.01% | +101,199+147.3% | Added |
| Acadian Asset Management LLC | 169,421 | $15.6M | 0.03% | +8,293+5.1% | Added |
| Axiom Investors LLC | 163,242 | $15.0M | 0.13% | +163,242 | New |
| Man Group plc | 162,940 | $15.0M | 0.03% | +28,565+21.3% | Added |
| HighTower Advisors, LLC | 157,470 | $14.5M | 0.02% | +3,441+2.2% | Added |
| Mirae Asset Global Investments Co., Ltd. | 157,148 | $14.4M | 0.04% | +27,472+21.2% | Added |
| Bridgewater Associates, LP | 154,296 | $14.2M | 0.05% | −20,818−11.9% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 150,124 | $13.8M | 0.02% | −2,409−1.6% | Reduced |
| Van Eck Associates Corp | 147,123 | $13.5M | 0.01% | −5,389−3.5% | Reduced |
| Two Sigma Investments, LP | 144,403 | $13.3M | 0.02% | +66,513+85.4% | Added |
| Russell Investments Group, Ltd. | 142,390 | $13.1M | 0.01% | −5,881−4.0% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 137,692 | $12.7M | 0.02% | +85,257+162.6% | Added |
| Mutual of America Capital Management LLC | 136,390 | $12.5M | 0.13% | −5,484−3.9% | Reduced |
| Federated Hermes, Inc. | 129,360 | $11.9M | 0.02% | +19,519+17.8% | Added |
| Retirement Systems of Alabama | 129,198 | $11.9M | 0.04% | −890−0.7% | Reduced |
| Janney Montgomery Scott LLC | 122,562 | $11.3M | 0.03% | +122,562 | New |
| Nordea Investment Management AB | 120,976 | $11.2M | 0.01% | −18,454−13.2% | Reduced |
| Intech Investment Management LLC | 120,052 | $11.0M | 0.10% | +55,481+85.9% | Added |
| Manufacturers Life Insurance Company, The | 113,988 | $10.5M | 0.01% | −1,382−1.2% | Reduced |
| Assetmark, Inc | 110,754 | $10.2M | 0.02% | −10,395−8.6% | Reduced |
| Renaissance Group LLC | 108,775 | $10.0M | 0.40% | +308+0.3% | Added |
| Segall Bryant & Hamill, LLC | 108,429 | $9.96M | 0.13% | −139,650−56.3% | Reduced |
| DekaBank Deutsche Girozentrale | 154,173 | $9.52M | 0.02% | 00.0% | Unchanged |
| Schroder Investment Management Group | 99,055 | $9.38M | 0.01% | −44,038−30.8% | Reduced |
| Tudor Investment Corp Et Al | 101,605 | $9.34M | 0.05% | +101,605 | New |
| State of Wisconsin Investment Board | 101,320 | $9.31M | 0.02% | −13,674−11.9% | Reduced |