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, Q3 2025
Institutional positions in Rambus Inc as of Sep 30, 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
- 513
- +62 vs. Q2 2025
- Shares held
- 98.8M
- +3.82M (+4.0%) vs. Q2 2025
- Total value
- $10.3B
- +$4.21B (+69.3%) vs. Q2 2025
- New holders
- 123
- 169 more added
- Sold out
- 61
- 163 more reduced
8 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Rambus Inc; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 15,808,693 | $1.65B | 0.03% | +808,613+5.4% | Added |
| Vanguard Group Inc | 12,701,773 | $1.32B | 0.02% | +140,948+1.1% | Added |
| Price T Rowe Associates Inc | 5,245,344 | $546.6M | 0.06% | +551,954+11.8% | Added |
| State Street Corp | 4,389,985 | $457.4M | 0.02% | −119,012−2.6% | Reduced |
| Geode Capital Management, LLC | 2,748,501 | $286.4M | 0.02% | +60,810+2.3% | Added |
| EdgePoint Investment Group Inc. | 2,682,956 | $279.6M | 2.09% | −104,371−3.7% | Reduced |
| JPMorgan Chase & Co | 2,556,838 | $266.4M | 0.02% | −623,538−19.6% | Reduced |
| Invesco Ltd. | 2,432,032 | $253.4M | 0.04% | +109,908+4.7% | Added |
| Dimensional Fund Advisors LP | 1,928,697 | $201.0M | 0.04% | +11,024+0.6% | Added |
| Alliancebernstein L.P. | 1,822,030 | $189.9M | 0.06% | +1,551,159+572.7% | Added |
| Swedbank AB | 1,700,000 | $177.1M | 0.18% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 1,598,338 | $166.5M | 0.03% | −421,166−20.9% | Reduced |
| Bank of America Corp | 1,550,665 | $161.6M | 0.01% | +1,026,776+196.0% | Added |
| Neuberger Berman Group LLC | 1,482,008 | $154.4M | 0.11% | +133,970+9.9% | Added |
| Northern Trust Corp | 1,385,874 | $144.4M | 0.02% | −7,812−0.6% | Reduced |
| FMR LLC | 1,373,524 | $143.1M | 0.01% | +1,035,263+306.1% | Added |
| Congress Asset Management Co | 1,347,185 | $140.4M | 0.93% | +70,259+5.5% | Added |
| Charles Schwab Investment Management Inc | 1,338,914 | $139.5M | 0.02% | +51,879+4.0% | Added |
| Nuveen, LLC | 1,283,125 | $133.7M | 0.04% | +147,455+13.0% | Added |
| Raymond James Financial Inc | 1,190,320 | $124.0M | 0.04% | −181,789−13.2% | Reduced |
| Goldman Sachs Group Inc | 1,187,133 | $123.7M | 0.02% | +527,524+80.0% | Added |
| Morgan Stanley | 1,065,804 | $111.1M | 0.01% | −97,455−8.4% | Reduced |
| Rafferty Asset Management, LLC | 901,750 | $94.0M | 0.30% | +901,750 | New |
| Barclays PLC | 894,906 | $93.2M | 0.03% | +578,839+183.1% | Added |
| Hood River Capital Management LLC | 838,440 | $87.4M | 1.03% | −117,160−12.3% | Reduced |
| Voya Investment Management LLC | 768,538 | $80.1M | 0.08% | −430,835−35.9% | Reduced |
| Wellington Management Group LLP | 750,446 | $78.2M | 0.01% | −456,320−37.8% | Reduced |
| Lord, Abbett & Co. LLC | 746,676 | $77.8M | 0.23% | +428,354+134.6% | Added |
| T. Rowe Price Investment Management, Inc. | 729,047 | $76.0M | 0.05% | +416,095+133.0% | Added |
| Emerald Advisers, LLC | 637,754 | $66.5M | 2.13% | −72,369−10.2% | Reduced |
| Analog Century Management LP | 631,343 | $65.8M | 3.53% | −195,759−23.7% | Reduced |
| Loomis Sayles & Co L P | 610,153 | $63.6M | 0.08% | +389,925+177.1% | Added |
| UBS Group AG | 565,805 | $59.0M | 0.01% | +425,364+302.9% | Added |
| AQR Capital Management LLC | 547,604 | $57.1M | 0.04% | −154,142−22.0% | Reduced |
| Oberweis Asset Management Inc | 507,899 | $52.9M | 2.03% | +2,119+0.4% | Added |
| Allspring Global Investments Holdings, LLC | 495,453 | $51.1M | 0.08% | +427,297+626.9% | Added |
| Westfield Capital Management Co LP | 484,465 | $50.5M | 0.21% | −477,954−49.7% | Reduced |
| Principal Financial Group Inc | 472,974 | $49.3M | 0.02% | −43,049−8.3% | Reduced |
| Franklin Resources Inc | 472,349 | $49.2M | 0.01% | +44,400+10.4% | Added |
| Silvercrest Asset Management Group LLC | 464,889 | $48.4M | 0.32% | −15,559−3.2% | Reduced |
| Ameriprise Financial Inc | 460,104 | $47.9M | 0.01% | +208,186+82.6% | Added |
| Panagora Asset Management Inc | 438,117 | $45.7M | 0.18% | −39,242−8.2% | Reduced |
| Emerald Mutual Fund Advisers Trust | 391,215 | $40.8M | 2.10% | −24,907−6.0% | Reduced |
| Janus Henderson Group PLC | 384,004 | $40.0M | 0.02% | +170,601+79.9% | Added |
| Caisse de Depot Et Placement du Quebec | 380,604 | $39.7M | 0.07% | +367,225+2,744.8% | Added |
| Citigroup Inc | 370,341 | $38.6M | 0.03% | +220,207+146.7% | Added |
| Rhumbline Advisers | 344,387 | $35.9M | 0.03% | −7,641−2.2% | Reduced |
| Lazard Asset Management LLC | 298,928 | $31.1M | 0.04% | +84,491+39.4% | Added |
| WCM Investment Management, LLC | 298,880 | $31.1M | 0.06% | −118,021−28.3% | Reduced |
| Macquarie Group Ltd | 292,205 | $30.4M | 0.04% | +36,112+14.1% | Added |
| William Blair Investment Management, LLC | 291,182 | $30.3M | 0.08% | +291,182 | New |
| SEI Investments Co | 280,553 | $29.2M | 0.03% | −126,803−31.1% | Reduced |
| Canada Pension Plan Investment Board | 254,600 | $26.5M | 0.02% | +113,100+79.9% | Added |
| UBS Asset Management Americas Inc | 253,906 | $26.5M | 0.01% | −168,899−39.9% | Reduced |
| Segall Bryant & Hamill, LLC | 248,079 | $25.8M | 0.34% | −14,498−5.5% | Reduced |
| MetLife Investment Management | 245,812 | $25.6M | 0.12% | −144,630−37.0% | Reduced |
| Granahan Investment Management Inc | 238,443 | $24.8M | 1.02% | +108,362+83.3% | Added |
| Westwood Holdings Group Inc. | 235,057 | $24.5M | 0.17% | −1,502,005−86.5% | Reduced |
| Schwartz Investment Counsel Inc | 230,337 | $24.0M | 0.81% | −150,000−39.4% | Reduced |
| Prudential Financial Inc | 221,021 | $23.0M | 0.03% | −42,350−16.1% | Reduced |
| Legal & General Group Plc | 219,714 | $22.9M | 0.01% | −10,483−4.6% | Reduced |
| Advisor Group Holdings, Inc. | 224,655 | $22.4M | 0.03% | +213,035+1,833.3% | Added |
| Swiss National Bank | 208,200 | $21.7M | 0.01% | +3,000+1.5% | Added |
| First Trust Advisors LP | 200,545 | $20.9M | 0.02% | +51,215+34.3% | Added |
| Healthcare of Ontario Pension Plan Trust Fund | 200,000 | $20.8M | 0.04% | +200,000 | New |
| Millennium Management LLC | 197,232 | $20.6M | 0.02% | −221,280−52.9% | Reduced |
| California Public Employees Retirement System | 196,091 | $20.4M | 0.01% | +10,208+5.5% | Added |
| Stephens Investment Management Group LLC | 193,391 | $20.2M | 0.26% | −1,732−0.9% | Reduced |
| Jane Street Group, LLC | 193,150 | $20.1M | 0.02% | +84,229+77.3% | Added |
| Glenmede Investment Management, LP | 188,187 | $19.6M | 0.09% | −109,253−36.7% | Reduced |
| Wells Fargo & Company | 180,980 | $18.9M | 0.00% | +10,341+6.1% | Added |
| Bridgewater Associates, LP | 175,114 | $18.2M | 0.07% | −51,755−22.8% | Reduced |
| Arrowstreet Capital, Limited Partnership | 173,353 | $18.1M | 0.01% | +173,353 | New |
| Point72 Asset Management, L.P. | 166,667 | $17.4M | 0.04% | +166,667 | New |
| CloudAlpha Capital Management Limited/Hong Kong | 165,800 | $17.3M | 1.55% | +165,800 | New |
| BNP Paribas Arbitrage, SA | 165,311 | $17.2M | 0.01% | −44,019−21.0% | Reduced |
| Acadian Asset Management LLC | 161,128 | $16.8M | 0.03% | +93,072+136.8% | Added |
| DekaBank Deutsche Girozentrale | 154,173 | $16.1M | 0.03% | 00.0% | Unchanged |
| HighTower Advisors, LLC | 154,029 | $16.0M | 0.02% | −64,291−29.4% | Reduced |
| Fisher Asset Management, LLC | 152,882 | $15.9M | 0.01% | +152,882 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 152,533 | $15.9M | 0.03% | −21,685−12.4% | Reduced |
| Van Eck Associates Corp | 152,512 | $15.9M | 0.01% | +39,148+34.5% | Added |
| Penn Capital Management Co Inc | 151,825 | $15.9M | 1.22% | −134,438−47.0% | Reduced |
| Osterweis Capital Management Inc | 151,560 | $15.8M | 0.71% | −132,850−46.7% | Reduced |
| Russell Investments Group, Ltd. | 148,271 | $15.4M | 0.02% | +17,093+13.0% | Added |
| Schroder Investment Management Group | 143,093 | $14.9M | 0.01% | +12,472+9.5% | Added |
| Mutual of America Capital Management LLC | 141,874 | $14.8M | 0.16% | −9,980−6.6% | Reduced |
| Nordea Investment Management AB | 139,430 | $14.7M | 0.01% | +70,314+101.7% | Added |
| Man Group plc | 134,375 | $14.0M | 0.03% | −6,917−4.9% | Reduced |
| Retirement Systems of Alabama | 130,088 | $13.6M | 0.05% | −1,195−0.9% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 129,676 | $13.5M | 0.04% | +120,549+1,320.8% | Added |
| Deutsche Bank AG | 125,944 | $13.1M | 0.00% | −1,862−1.5% | Reduced |
| New York State Common Retirement Fund | 125,713 | $13.1M | 0.02% | −81,526−39.3% | Reduced |
| Algert Global LLC | 122,387 | $12.8M | 0.21% | −48,457−28.4% | Reduced |
| Assetmark, Inc | 121,149 | $12.6M | 0.03% | −4,407−3.5% | Reduced |
| Manufacturers Life Insurance Company, The | 115,370 | $12.0M | 0.01% | −5,839−4.8% | Reduced |
| State of Wisconsin Investment Board | 114,994 | $12.0M | 0.03% | +13,999+13.9% | Added |
| Hillsdale Investment Management Inc. | 112,700 | $11.7M | 0.35% | +9,070+8.8% | Added |
| Castleark Management LLC | 110,838 | $11.5M | 0.32% | −3,862−3.4% | Reduced |
| Federated Hermes, Inc. | 109,841 | $11.4M | 0.02% | +99,814+995.5% | Added |