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 |
|---|---|---|---|---|---|
| Aspetuck Financial Management LLC | 38,175 | $3.28M | 2.25% | 00.0% | Unchanged |
| Meiji Yasuda Asset Management Co Ltd. | 39,661 | $3.41M | 0.17% | +37,161+1,486.4% | Added |
| Diversified Trust Co | 39,861 | $3.43M | 0.06% | +11,506+40.6% | Added |
| Diversify Wealth Management, LLC | 31,253 | $3.51M | 0.06% | +13,470+75.7% | Added |
| Campbell Newman Asset Management Inc | 41,067 | $3.53M | 0.29% | +721+1.8% | Added |
| State of Tennessee, Treasury Department | 42,268 | $3.64M | 0.01% | 00.0% | Unchanged |
| EFG International AG | 42,417 | $3.65M | 0.08% | +4,886+13.0% | Added |
| Guggenheim Capital LLC | 42,731 | $3.68M | 0.03% | +19,226+81.8% | Added |
| New York State Common Retirement Fund | 42,938 | $3.69M | 0.01% | +1,000+2.4% | Added |
| Pictet Asset Management Holding SA | 43,583 | $3.75M | 0.00% | +2,832+6.9% | Added |
| Raiffeisen Bank International AG | 48,000 | $3.83M | 0.06% | +48,000 | New |
| Hancock Whitney Corp | 33,382 | $3.84M | 0.07% | +2,854+9.3% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 44,874 | $3.86M | 0.01% | +8,072+21.9% | Added |
| American Century Companies Inc | 45,490 | $3.91M | 0.00% | −12,812−22.0% | Reduced |
| Amalgamated Bank | 46,548 | $4.00M | 0.03% | +1,209+2.7% | Added |
| Tower Research Capital LLC (TRC) | 46,839 | $4.03M | 0.10% | +22,134+89.6% | Added |
| Primecap Management Co | 47,500 | $4.09M | 0.00% | 00.0% | Unchanged |
| Assenagon Asset Management S.A. | 47,531 | $4.09M | 0.01% | +1,174+2.5% | Added |
| Vanguard Global Advisers, LLC | 47,982 | $4.13M | 0.00% | +47,982 | New |
| Teachers Retirement System of the State of Kentucky | 49,124 | $4.23M | 0.03% | −236−0.5% | Reduced |
| AI-Squared Management Ltd | 49,578 | $4.27M | 3.10% | +49,578 | New |
| Holocene Advisors, LP | 49,604 | $4.27M | 0.01% | +49,604 | New |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 50,271 | $4.32M | 0.01% | −7,528−13.0% | Reduced |
| Nicholas Investment Partners, LP | 50,851 | $4.37M | 0.32% | +3,048+6.4% | Added |
| Captrust Financial Advisors | 51,797 | $4.46M | 0.01% | +10,921+26.7% | Added |
| Bridgewater Associates, LP | 51,854 | $4.46M | 0.02% | −102,442−66.4% | Reduced |
| Vident Advisory, LLC | 51,947 | $4.47M | 0.04% | −14,124−21.4% | Reduced |
| Mackenzie Financial Corp | 53,689 | $4.62M | 0.01% | +29,540+122.3% | Added |
| Penserra Capital Management LLC | 57,161 | $4.92M | 0.06% | +57,161 | New |
| Loup Funds, LLC | 58,036 | $4.99M | 3.16% | +58,036 | New |
| Thornburg Investment Management Inc | 58,106 | $5.00M | 0.05% | +552+1.0% | Added |
| Great West Life Assurance Co | 62,130 | $5.35M | 0.01% | +159+0.3% | Added |
| Weiss Asset Management LP | 63,100 | $5.43M | 0.10% | +26,800+73.8% | Added |
| Munro Partners | 64,395 | $5.54M | 0.19% | +64,395 | New |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 66,044 | $5.68M | 0.01% | −71,648−52.0% | Reduced |
| Fred Alger Management, LLC | 66,862 | $5.75M | 0.03% | −341−0.5% | Reduced |
| Allspring Global Investments Holdings, LLC | 66,531 | $5.98M | 0.01% | −455,695−87.3% | Reduced |
| Algert Global LLC | 72,447 | $6.23M | 0.09% | −129,775−64.2% | Reduced |
| New York State Teachers Retirement System | 73,322 | $6.31M | 0.01% | −3,604−4.7% | Reduced |
| AMJ Financial Wealth Management | 76,330 | $6.57M | 1.56% | −18,616−19.6% | Reduced |
| Two Sigma Investments, LP | 77,410 | $6.66M | 0.01% | −66,993−46.4% | Reduced |
| SummitTX Capital, L.P. | 80,674 | $6.94M | 0.22% | −16,698−17.1% | Reduced |
| Osterweis Capital Management Inc | 84,930 | $7.31M | 0.38% | −4,135−4.6% | Reduced |
| Susquehanna International Group, LLP | 85,824 | $7.38M | 0.01% | +71,990+520.4% | Added |
| LPL Financial LLC | 87,964 | $7.57M | 0.00% | +3,429+4.1% | Added |
| Allianz Asset Management GmbH | 89,106 | $7.67M | 0.01% | +89,106 | New |
| Prudential Financial Inc | 89,397 | $7.69M | 0.01% | −124,245−58.2% | Reduced |
| Envestnet Asset Management Inc | 90,674 | $7.80M | 0.00% | +21,287+30.7% | Added |
| State of Wisconsin Investment Board | 95,368 | $8.20M | 0.02% | −5,952−5.9% | Reduced |
| Rockefeller Capital Management L.P. | 95,452 | $8.21M | 0.01% | +92,768+3,456.3% | Added |
| Vanguard Asset Management, Ltd | 97,189 | $8.36M | 0.01% | +97,189 | New |
| Alight Capital Management LP | 100,000 | $8.60M | 2.50% | +100,000 | New |
| Schroder Investment Management Group | 108,594 | $8.66M | 0.01% | +9,539+9.6% | Added |
| Lazard Asset Management LLC | 101,701 | $8.75M | 0.01% | −196,169−65.9% | Reduced |
| DF Dent & Co Inc | 101,865 | $8.76M | 0.17% | +101,865 | New |
| Creative Planning | 102,320 | $8.80M | 0.01% | +11,007+12.1% | Added |
| Manufacturers Life Insurance Company, The | 102,403 | $8.81M | 0.01% | −11,585−10.2% | Reduced |
| Nordea Investment Management AB | 108,055 | $8.86M | 0.01% | −12,921−10.7% | Reduced |
| Renaissance Group LLC | 105,795 | $9.10M | 0.38% | −2,980−2.7% | Reduced |
| Deutsche Bank AG | 108,308 | $9.32M | 0.00% | +11,112+11.4% | Added |
| MetLife Investment Management | 109,833 | $9.45M | 0.05% | −130,329−54.3% | Reduced |
| Janney Montgomery Scott LLC | 110,607 | $9.52M | 0.02% | −11,955−9.8% | Reduced |
| Intech Investment Management LLC | 114,367 | $9.84M | 0.10% | −5,685−4.7% | Reduced |
| Handelsbanken Fonder AB | 117,797 | $10.1M | 0.03% | +86,000+270.5% | Added |
| Tairen Capital Ltd | 120,000 | $10.3M | 1.12% | +120,000 | New |
| TD Asset Management Inc | 120,282 | $10.3M | 0.01% | +96,272+401.0% | Added |
| California State Teachers Retirement System | 124,195 | $10.7M | 0.01% | +23,170+22.9% | Added |
| Wells Fargo & Company | 124,889 | $10.7M | 0.00% | −92,025−42.4% | Reduced |
| Toroso Investments, LLC | 125,305 | $10.8M | 0.03% | +82,803+194.8% | Added |
| Russell Investments Group, Ltd. | 129,892 | $11.2M | 0.01% | −12,498−8.8% | Reduced |
| Retirement Systems of Alabama | 131,972 | $11.4M | 0.04% | +2,774+2.1% | Added |
| Mutual of America Capital Management LLC | 132,611 | $11.4M | 0.13% | −3,779−2.8% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 134,273 | $11.6M | 0.03% | −22,875−14.6% | Reduced |
| Man Group plc | 139,132 | $12.0M | 0.02% | −23,808−14.6% | Reduced |
| Axiom Investors LLC | 139,229 | $12.0M | 0.13% | −24,013−14.7% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 141,085 | $12.1M | 0.02% | −9,039−6.0% | Reduced |
| Millennium Management LLC | 141,314 | $12.2M | 0.01% | −121,264−46.2% | Reduced |
| Van Eck Associates Corp | 145,251 | $12.5M | 0.01% | −1,872−1.3% | Reduced |
| DekaBank Deutsche Girozentrale | 154,173 | $12.5M | 0.02% | 00.0% | Unchanged |
| Assetmark, Inc | 147,554 | $12.7M | 0.03% | +36,800+33.2% | Added |
| WCM Investment Management, LLC | 165,018 | $13.2M | 0.03% | −7,348−4.3% | Reduced |
| Steadfast Capital Management LP | 153,250 | $13.2M | 0.50% | +153,250 | New |
| Segall Bryant & Hamill, LLC | 157,450 | $13.5M | 0.19% | +49,021+45.2% | Added |
| Legal & General Group Plc | 158,704 | $13.7M | 0.00% | −18,892−10.6% | Reduced |
| Glenmede Trust Co NA | 159,131 | $13.7M | 0.07% | −13,403−7.8% | Reduced |
| Thrivent Financial for Lutherans | 162,057 | $13.9M | 0.03% | +67,562+71.5% | Added |
| Driehaus Capital Management LLC | 173,953 | $15.0M | 0.11% | −780,211−81.8% | Reduced |
| HighTower Advisors, LLC | 181,596 | $15.6M | 0.02% | +24,126+15.3% | Added |
| Victory Capital Management Inc | 182,999 | $15.7M | 0.01% | +116,014+173.2% | Added |
| Canada Pension Plan Investment Board | 199,448 | $17.2M | 0.01% | −267,152−57.3% | Reduced |
| Advisor Group Holdings, Inc. | 199,726 | $17.2M | 0.03% | −17,346−8.0% | Reduced |
| Swiss National Bank | 213,000 | $18.3M | 0.01% | +800+0.4% | Added |
| Federated Hermes, Inc. | 215,400 | $18.5M | 0.03% | +86,040+66.5% | Added |
| Ranger Investment Management, L.P. | 224,365 | $19.3M | 1.40% | +128,875+135.0% | Added |
| California Public Employees Retirement System | 227,271 | $19.6M | 0.01% | +31,064+15.8% | Added |
| UBS Asset Management Americas Inc | 240,606 | $20.7M | 0.00% | −3,738−1.5% | Reduced |
| ArrowMark Colorado Holdings LLC | 261,716 | $22.5M | 0.60% | −10,294−3.8% | Reduced |
| BNP Paribas Arbitrage, SA | 264,398 | $22.7M | 0.01% | +17,904+7.3% | Added |
| Granahan Investment Management Inc | 280,246 | $24.1M | 1.17% | +14,730+5.5% | Added |
| Alliancebernstein L.P. | 267,189 | $24.6M | 0.01% | −1,633,119−85.9% | Reduced |