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, 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 | 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, 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 |
|---|---|---|---|---|---|
| First Trust Advisors LP | 307,244 | $26.4M | 0.02% | +7,088+2.4% | Added |
| Emerald Mutual Fund Advisers Trust | 307,248 | $26.4M | 1.28% | −83,967−21.5% | Reduced |
| TimesSquare Capital Management, LLC | 312,360 | $26.9M | 0.46% | +312,360 | New |
| Rhumbline Advisers | 319,580 | $27.5M | 0.02% | +4,968+1.6% | Added |
| Franklin Resources Inc | 323,364 | $27.8M | 0.01% | −162,441−33.4% | Reduced |
| Nomura Asset Management International Inc. | 326,938 | $28.1M | 0.05% | +110,071+50.8% | Added |
| Shannon River Fund Management LLC | 333,817 | $28.7M | 5.48% | +333,817 | New |
| SEI Investments Co | 339,931 | $29.2M | 0.03% | −46,814−12.1% | Reduced |
| Champlain Investment Partners, LLC | 357,223 | $30.7M | 0.39% | +357,223 | New |
| Janus Henderson Group PLC | 358,892 | $30.9M | 0.01% | −20,623−5.4% | Reduced |
| Westwood Holdings Group Inc. | 369,150 | $31.8M | 0.23% | +84,077+29.5% | Added |
| Principal Financial Group Inc | 373,536 | $32.1M | 0.02% | −38,183−9.3% | Reduced |
| Lord, Abbett & Co. LLC | 387,119 | $33.3M | 0.11% | −151,909−28.2% | Reduced |
| Stephens Investment Management Group LLC | 407,783 | $35.1M | 0.48% | +214,081+110.5% | Added |
| Schwartz Investment Counsel Inc | 420,337 | $36.2M | 1.28% | +240,000+133.1% | Added |
| Panagora Asset Management Inc | 436,431 | $37.5M | 0.14% | +1,728+0.4% | Added |
| Caisse de Depot Et Placement du Quebec | 448,595 | $38.6M | 0.06% | +1,286+0.3% | Added |
| Emerald Advisers, LLC | 493,236 | $42.4M | 1.34% | −133,749−21.3% | Reduced |
| Oberweis Asset Management Inc | 526,316 | $45.3M | 1.34% | +64,216+13.9% | Added |
| Clearbridge Investments, LLC | 583,270 | $50.2M | 0.04% | +583,270 | New |
| Loomis Sayles & Co L P | 659,835 | $56.8M | 0.08% | −40,498−5.8% | Reduced |
| PointState Capital LP | 701,307 | $60.3M | 1.40% | +701,307 | New |
| Hood River Capital Management LLC | 727,494 | $62.6M | 0.63% | +18,648+2.6% | Added |
| Fisher Asset Management, LLC | 738,356 | $63.5M | 0.02% | +221,078+42.7% | Added |
| Rafferty Asset Management, LLC | 745,519 | $64.1M | 0.26% | −190,265−20.3% | Reduced |
| Vanguard Fiduciary Trust Co | 749,880 | $64.5M | 0.02% | +749,880 | New |
| Raymond James Financial Inc | 790,979 | $65.5M | 0.02% | −141,302−15.2% | Reduced |
| Voya Investment Management LLC | 765,785 | $65.9M | 0.07% | +41,577+5.7% | Added |
| Bank of New York Mellon Corp | 779,878 | $67.1M | 0.01% | −314,278−28.7% | Reduced |
| Wellington Management Group LLP | 856,598 | $73.7M | 0.01% | −77,336−8.3% | Reduced |
| Nuveen, LLC | 892,337 | $76.8M | 0.02% | −209,753−19.0% | Reduced |
| Goldman Sachs Group Inc | 922,105 | $79.3M | 0.01% | −272,286−22.8% | Reduced |
| UBS Group AG | 956,387 | $82.3M | 0.01% | +500,717+109.9% | Added |
| Ameriprise Financial Inc | 975,209 | $83.9M | 0.02% | +408,530+72.1% | Added |
| Citigroup Inc | 1,007,548 | $86.7M | 0.06% | +505,008+100.5% | Added |
| Bessemer Group Inc | 1,039,905 | $89.5M | 0.14% | +946,177+1,009.5% | Added |
| Barclays PLC | 1,095,701 | $94.3M | 0.03% | +72,717+7.1% | Added |
| AQR Capital Management LLC | 1,250,456 | $104.0M | 0.05% | +539,330+75.8% | Added |
| Morgan Stanley | 1,213,197 | $104.4M | 0.01% | +328,105+37.1% | Added |
| Congress Asset Management Co | 1,275,978 | $109.8M | 0.79% | −134,637−9.5% | Reduced |
| Neuberger Berman Group LLC | 1,302,169 | $111.7M | 0.09% | −3,782−0.3% | Reduced |
| Charles Schwab Investment Management Inc | 1,326,402 | $114.1M | 0.02% | −1,291−0.1% | Reduced |
| Northern Trust Corp | 1,334,095 | $114.8M | 0.02% | +18,544+1.4% | Added |
| Bank of America Corp | 1,361,570 | $117.1M | 0.01% | +111,928+9.0% | Added |
| Swedbank AB | 1,563,000 | $134.5M | 0.14% | +200,000+14.7% | Added |
| JPMorgan Chase & Co | 1,836,500 | $146.4M | 0.01% | −228,843−11.1% | Reduced |
| Dimensional Fund Advisors LP | 1,795,295 | $154.4M | 0.03% | −98,233−5.2% | Reduced |
| EdgePoint Investment Group Inc. | 1,947,742 | $167.6M | 1.34% | +541,056+38.5% | Added |
| T. Rowe Price Investment Management, Inc. | 2,391,020 | $205.7M | 0.14% | +1,703,180+247.6% | Added |
| Geode Capital Management, LLC | 3,124,495 | $268.8M | 0.02% | +281,780+9.9% | Added |
| FMR LLC | 3,318,449 | $285.5M | 0.02% | +1,731,420+109.1% | Added |
| Price T Rowe Associates Inc | 3,376,689 | $290.5M | 0.03% | −2,008,881−37.3% | Reduced |
| State Street Corp | 4,373,617 | $376.3M | 0.01% | +122,054+2.9% | Added |
| Vanguard Capital Management LLC | 4,827,854 | $415.3M | 0.01% | +4,827,854 | New |
| Invesco Ltd. | 6,499,048 | $559.1M | 0.05% | +2,350,395+56.7% | Added |
| Vanguard Portfolio Management LLC | 6,644,320 | $571.6M | 0.03% | +6,644,320 | New |
| BlackRock, Inc. | 16,305,306 | $1.40B | 0.02% | +30,120+0.2% | Added |
| William Blair Investment Management, LLC | 0 | $0 | 0.00% | −316,397−100.0% | Sold out |
| Public Sector Pension Investment Board | 0 | $0 | 0.00% | −305,209−100.0% | Sold out |
| Tudor Investment Corp Et Al | 0 | $0 | 0.00% | −101,605−100.0% | Sold out |
| Castleark Management LLC | 0 | $0 | 0.00% | −95,578−100.0% | Sold out |
| Hillsdale Investment Management Inc. | 0 | $0 | 0.00% | −88,990−100.0% | Sold out |
| Trexquant Investment LP | 0 | $0 | 0.00% | −74,943−100.0% | Sold out |
| EAM Investors, LLC | 0 | $0 | 0.00% | −60,957−100.0% | Sold out |
| Erste Asset Management GmbH | 0 | $0 | 0.00% | −55,600−100.0% | Sold out |
| M37 Management LP | 0 | $0 | 0.00% | −50,000−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −46,700−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −30,021−100.0% | Sold out |
| F/M Investments LLC | 0 | $0 | 0.00% | −26,710−100.0% | Sold out |
| Skandinaviska Enskilda Banken AB (publ) | 0 | $0 | 0.00% | −24,177−100.0% | Sold out |
| PEAK6 LLC | 0 | $0 | 0.00% | −17,648−100.0% | Sold out |
| Epoch Investment Partners, Inc. | 0 | $0 | 0.00% | −17,603−100.0% | Sold out |
| GF Fund Management Co. Ltd. | 0 | $0 | 0.00% | −15,975−100.0% | Sold out |
| Credit Agricole S A | 0 | $0 | 0.00% | −15,114−100.0% | Sold out |
| Campbell & CO Investment Adviser LLC | 0 | $0 | 0.00% | −14,091−100.0% | Sold out |
| Entropy Technologies, LP | 0 | $0 | 0.00% | −12,810−100.0% | Sold out |
| Edgestream Partners, L.P. | 0 | $0 | 0.00% | −11,739−100.0% | Sold out |
| Encompass More Asset Management | 0 | $0 | 0.00% | −10,349−100.0% | Sold out |
| Eventide Asset Management, LLC | 0 | $0 | 0.00% | −10,330−100.0% | Sold out |
| Vestmark Advisory Solutions, Inc. | 0 | $0 | 0.00% | −9,992−100.0% | Sold out |
| FirstWave Capital Management LLC | 0 | $0 | 0.00% | −9,933−100.0% | Sold out |
| GTS Securities LLC | 0 | $0 | 0.00% | −9,846−100.0% | Sold out |
| Sigma Planning Corp | 0 | $0 | 0.00% | −9,460−100.0% | Sold out |
| Diametric Capital, LP | 0 | $0 | 0.00% | −6,991−100.0% | Sold out |
| Axq Capital, LP | 0 | $0 | 0.00% | −6,742−100.0% | Sold out |
| Integrated Advisors Network LLC | 0 | $0 | 0.00% | −6,475−100.0% | Sold out |
| Calamos Advisors LLC | 0 | $0 | 0.00% | −6,316−100.0% | Sold out |
| VGI Partners Ltd | 0 | $0 | 0.00% | −6,000−100.0% | Sold out |
| Qube Research & Technologies Ltd | 0 | $0 | 0.00% | −5,648−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −5,496−100.0% | Sold out |
| CoreCap Advisors, LLC | 0 | $0 | 0.00% | −4,367−100.0% | Sold out |
| Verition Fund Management LLC | 0 | $0 | 0.00% | −4,091−100.0% | Sold out |
| Forum Financial Management, LP | 0 | $0 | 0.00% | −3,891−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −3,884−100.0% | Sold out |
| Oak Ridge Investments LLC | 0 | $0 | 0.00% | −3,828−100.0% | Sold out |
| Freestone Grove Partners LP | 0 | $0 | 0.00% | −3,574−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −3,505−100.0% | Sold out |
| Occudo Quantitative Strategies LP | 0 | $0 | 0.00% | −3,494−100.0% | Sold out |
| City Center Advisors, LLC | 0 | $0 | 0.00% | −3,338−100.0% | Sold out |
| Journey Retirement Planning & Investment Management LLC | 0 | $0 | 0.00% | −3,312−100.0% | Sold out |