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, Q1 2026
Institutional positions in Rambus Inc as of Mar 31, 2026. 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
- 557
- +11 vs. Q4 2025
- Shares held
- 102.8M
- +17.0M (+19.8%) vs. Q4 2025
- Total value
- $8.83B
- +$938.8M (+11.9%) vs. Q4 2025
- New holders
- 85
- 189 more added
- Sold out
- 74
- 207 more reduced
8 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Rambus Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 16,305,306 | $1.40B | 0.02% | +30,120+0.2% | Added |
| Vanguard Portfolio Management LLC | 6,644,320 | $571.6M | 0.03% | +6,644,320 | New |
| Invesco Ltd. | 6,499,048 | $559.1M | 0.05% | +2,350,395+56.7% | Added |
| Vanguard Capital Management LLC | 4,827,854 | $415.3M | 0.01% | +4,827,854 | New |
| State Street Corp | 4,373,617 | $376.3M | 0.01% | +122,054+2.9% | Added |
| Price T Rowe Associates Inc | 3,376,689 | $290.5M | 0.03% | −2,008,881−37.3% | Reduced |
| FMR LLC | 3,318,449 | $285.5M | 0.02% | +1,731,420+109.1% | Added |
| Geode Capital Management, LLC | 3,124,495 | $268.8M | 0.02% | +281,780+9.9% | Added |
| T. Rowe Price Investment Management, Inc. | 2,391,020 | $205.7M | 0.14% | +1,703,180+247.6% | Added |
| EdgePoint Investment Group Inc. | 1,947,742 | $167.6M | 1.34% | +541,056+38.5% | Added |
| Dimensional Fund Advisors LP | 1,795,295 | $154.4M | 0.03% | −98,233−5.2% | Reduced |
| JPMorgan Chase & Co | 1,836,500 | $146.4M | 0.01% | −228,843−11.1% | Reduced |
| Swedbank AB | 1,563,000 | $134.5M | 0.14% | +200,000+14.7% | Added |
| Bank of America Corp | 1,361,570 | $117.1M | 0.01% | +111,928+9.0% | Added |
| Northern Trust Corp | 1,334,095 | $114.8M | 0.02% | +18,544+1.4% | Added |
| Charles Schwab Investment Management Inc | 1,326,402 | $114.1M | 0.02% | −1,291−0.1% | Reduced |
| Neuberger Berman Group LLC | 1,302,169 | $111.7M | 0.09% | −3,782−0.3% | Reduced |
| Congress Asset Management Co | 1,275,978 | $109.8M | 0.79% | −134,637−9.5% | Reduced |
| Morgan Stanley | 1,213,197 | $104.4M | 0.01% | +328,105+37.1% | Added |
| AQR Capital Management LLC | 1,250,456 | $104.0M | 0.05% | +539,330+75.8% | Added |
| Barclays PLC | 1,095,701 | $94.3M | 0.03% | +72,717+7.1% | Added |
| Bessemer Group Inc | 1,039,905 | $89.5M | 0.14% | +946,177+1,009.5% | Added |
| Citigroup Inc | 1,007,548 | $86.7M | 0.06% | +505,008+100.5% | Added |
| Ameriprise Financial Inc | 975,209 | $83.9M | 0.02% | +408,530+72.1% | Added |
| UBS Group AG | 956,387 | $82.3M | 0.01% | +500,717+109.9% | Added |
| Goldman Sachs Group Inc | 922,105 | $79.3M | 0.01% | −272,286−22.8% | Reduced |
| Nuveen, LLC | 892,337 | $76.8M | 0.02% | −209,753−19.0% | Reduced |
| Wellington Management Group LLP | 856,598 | $73.7M | 0.01% | −77,336−8.3% | Reduced |
| Bank of New York Mellon Corp | 779,878 | $67.1M | 0.01% | −314,278−28.7% | Reduced |
| Voya Investment Management LLC | 765,785 | $65.9M | 0.07% | +41,577+5.7% | Added |
| Raymond James Financial Inc | 790,979 | $65.5M | 0.02% | −141,302−15.2% | Reduced |
| Vanguard Fiduciary Trust Co | 749,880 | $64.5M | 0.02% | +749,880 | New |
| Rafferty Asset Management, LLC | 745,519 | $64.1M | 0.26% | −190,265−20.3% | Reduced |
| Fisher Asset Management, LLC | 738,356 | $63.5M | 0.02% | +221,078+42.7% | Added |
| Hood River Capital Management LLC | 727,494 | $62.6M | 0.63% | +18,648+2.6% | Added |
| PointState Capital LP | 701,307 | $60.3M | 1.40% | +701,307 | New |
| Loomis Sayles & Co L P | 659,835 | $56.8M | 0.08% | −40,498−5.8% | Reduced |
| Clearbridge Investments, LLC | 583,270 | $50.2M | 0.04% | +583,270 | New |
| Oberweis Asset Management Inc | 526,316 | $45.3M | 1.34% | +64,216+13.9% | Added |
| Emerald Advisers, LLC | 493,236 | $42.4M | 1.34% | −133,749−21.3% | Reduced |
| Caisse de Depot Et Placement du Quebec | 448,595 | $38.6M | 0.06% | +1,286+0.3% | Added |
| Panagora Asset Management Inc | 436,431 | $37.5M | 0.14% | +1,728+0.4% | Added |
| Schwartz Investment Counsel Inc | 420,337 | $36.2M | 1.28% | +240,000+133.1% | Added |
| Stephens Investment Management Group LLC | 407,783 | $35.1M | 0.48% | +214,081+110.5% | Added |
| Lord, Abbett & Co. LLC | 387,119 | $33.3M | 0.11% | −151,909−28.2% | Reduced |
| Principal Financial Group Inc | 373,536 | $32.1M | 0.02% | −38,183−9.3% | Reduced |
| Westwood Holdings Group Inc. | 369,150 | $31.8M | 0.23% | +84,077+29.5% | Added |
| Janus Henderson Group PLC | 358,892 | $30.9M | 0.01% | −20,623−5.4% | Reduced |
| Champlain Investment Partners, LLC | 357,223 | $30.7M | 0.39% | +357,223 | New |
| SEI Investments Co | 339,931 | $29.2M | 0.03% | −46,814−12.1% | Reduced |
| Shannon River Fund Management LLC | 333,817 | $28.7M | 5.48% | +333,817 | New |
| Nomura Asset Management International Inc. | 326,938 | $28.1M | 0.05% | +110,071+50.8% | Added |
| Franklin Resources Inc | 323,364 | $27.8M | 0.01% | −162,441−33.4% | Reduced |
| Rhumbline Advisers | 319,580 | $27.5M | 0.02% | +4,968+1.6% | Added |
| TimesSquare Capital Management, LLC | 312,360 | $26.9M | 0.46% | +312,360 | New |
| Emerald Mutual Fund Advisers Trust | 307,248 | $26.4M | 1.28% | −83,967−21.5% | Reduced |
| First Trust Advisors LP | 307,244 | $26.4M | 0.02% | +7,088+2.4% | Added |
| Alliancebernstein L.P. | 267,189 | $24.6M | 0.01% | −1,633,119−85.9% | Reduced |
| Granahan Investment Management Inc | 280,246 | $24.1M | 1.17% | +14,730+5.5% | Added |
| BNP Paribas Arbitrage, SA | 264,398 | $22.7M | 0.01% | +17,904+7.3% | Added |
| ArrowMark Colorado Holdings LLC | 261,716 | $22.5M | 0.60% | −10,294−3.8% | Reduced |
| UBS Asset Management Americas Inc | 240,606 | $20.7M | 0.00% | −3,738−1.5% | Reduced |
| California Public Employees Retirement System | 227,271 | $19.6M | 0.01% | +31,064+15.8% | Added |
| Ranger Investment Management, L.P. | 224,365 | $19.3M | 1.40% | +128,875+135.0% | Added |
| Federated Hermes, Inc. | 215,400 | $18.5M | 0.03% | +86,040+66.5% | Added |
| Swiss National Bank | 213,000 | $18.3M | 0.01% | +800+0.4% | Added |
| Advisor Group Holdings, Inc. | 199,726 | $17.2M | 0.03% | −17,346−8.0% | Reduced |
| Canada Pension Plan Investment Board | 199,448 | $17.2M | 0.01% | −267,152−57.3% | Reduced |
| Victory Capital Management Inc | 182,999 | $15.7M | 0.01% | +116,014+173.2% | Added |
| HighTower Advisors, LLC | 181,596 | $15.6M | 0.02% | +24,126+15.3% | Added |
| Driehaus Capital Management LLC | 173,953 | $15.0M | 0.11% | −780,211−81.8% | Reduced |
| Thrivent Financial for Lutherans | 162,057 | $13.9M | 0.03% | +67,562+71.5% | Added |
| Glenmede Trust Co NA | 159,131 | $13.7M | 0.07% | −13,403−7.8% | Reduced |
| Legal & General Group Plc | 158,704 | $13.7M | 0.00% | −18,892−10.6% | Reduced |
| Segall Bryant & Hamill, LLC | 157,450 | $13.5M | 0.19% | +49,021+45.2% | Added |
| Steadfast Capital Management LP | 153,250 | $13.2M | 0.50% | +153,250 | New |
| WCM Investment Management, LLC | 165,018 | $13.2M | 0.03% | −7,348−4.3% | Reduced |
| Assetmark, Inc | 147,554 | $12.7M | 0.03% | +36,800+33.2% | Added |
| DekaBank Deutsche Girozentrale | 154,173 | $12.5M | 0.02% | 00.0% | Unchanged |
| Van Eck Associates Corp | 145,251 | $12.5M | 0.01% | −1,872−1.3% | Reduced |
| Millennium Management LLC | 141,314 | $12.2M | 0.01% | −121,264−46.2% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 141,085 | $12.1M | 0.02% | −9,039−6.0% | Reduced |
| Axiom Investors LLC | 139,229 | $12.0M | 0.13% | −24,013−14.7% | Reduced |
| Man Group plc | 139,132 | $12.0M | 0.02% | −23,808−14.6% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 134,273 | $11.6M | 0.03% | −22,875−14.6% | Reduced |
| Mutual of America Capital Management LLC | 132,611 | $11.4M | 0.13% | −3,779−2.8% | Reduced |
| Retirement Systems of Alabama | 131,972 | $11.4M | 0.04% | +2,774+2.1% | Added |
| Russell Investments Group, Ltd. | 129,892 | $11.2M | 0.01% | −12,498−8.8% | Reduced |
| Toroso Investments, LLC | 125,305 | $10.8M | 0.03% | +82,803+194.8% | Added |
| Wells Fargo & Company | 124,889 | $10.7M | 0.00% | −92,025−42.4% | Reduced |
| California State Teachers Retirement System | 124,195 | $10.7M | 0.01% | +23,170+22.9% | Added |
| TD Asset Management Inc | 120,282 | $10.3M | 0.01% | +96,272+401.0% | Added |
| Tairen Capital Ltd | 120,000 | $10.3M | 1.12% | +120,000 | New |
| Handelsbanken Fonder AB | 117,797 | $10.1M | 0.03% | +86,000+270.5% | Added |
| Intech Investment Management LLC | 114,367 | $9.84M | 0.10% | −5,685−4.7% | Reduced |
| Janney Montgomery Scott LLC | 110,607 | $9.52M | 0.02% | −11,955−9.8% | Reduced |
| MetLife Investment Management | 109,833 | $9.45M | 0.05% | −130,329−54.3% | Reduced |
| Deutsche Bank AG | 108,308 | $9.32M | 0.00% | +11,112+11.4% | Added |
| Renaissance Group LLC | 105,795 | $9.10M | 0.38% | −2,980−2.7% | Reduced |
| Nordea Investment Management AB | 108,055 | $8.86M | 0.01% | −12,921−10.7% | Reduced |