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 |
|---|---|---|---|---|---|
| Manufacturers Life Insurance Company, The | 102,403 | $8.81M | 0.01% | −11,585−10.2% | Reduced |
| Creative Planning | 102,320 | $8.80M | 0.01% | +11,007+12.1% | Added |
| DF Dent & Co Inc | 101,865 | $8.76M | 0.17% | +101,865 | New |
| Lazard Asset Management LLC | 101,701 | $8.75M | 0.01% | −196,169−65.9% | Reduced |
| Schroder Investment Management Group | 108,594 | $8.66M | 0.01% | +9,539+9.6% | Added |
| Alight Capital Management LP | 100,000 | $8.60M | 2.50% | +100,000 | New |
| Vanguard Asset Management, Ltd | 97,189 | $8.36M | 0.01% | +97,189 | New |
| Rockefeller Capital Management L.P. | 95,452 | $8.21M | 0.01% | +92,768+3,456.3% | Added |
| State of Wisconsin Investment Board | 95,368 | $8.20M | 0.02% | −5,952−5.9% | Reduced |
| Envestnet Asset Management Inc | 90,674 | $7.80M | 0.00% | +21,287+30.7% | Added |
| Prudential Financial Inc | 89,397 | $7.69M | 0.01% | −124,245−58.2% | Reduced |
| Allianz Asset Management GmbH | 89,106 | $7.67M | 0.01% | +89,106 | New |
| LPL Financial LLC | 87,964 | $7.57M | 0.00% | +3,429+4.1% | Added |
| Susquehanna International Group, LLP | 85,824 | $7.38M | 0.01% | +71,990+520.4% | Added |
| Osterweis Capital Management Inc | 84,930 | $7.31M | 0.38% | −4,135−4.6% | Reduced |
| SummitTX Capital, L.P. | 80,674 | $6.94M | 0.22% | −16,698−17.1% | Reduced |
| Two Sigma Investments, LP | 77,410 | $6.66M | 0.01% | −66,993−46.4% | Reduced |
| AMJ Financial Wealth Management | 76,330 | $6.57M | 1.56% | −18,616−19.6% | Reduced |
| New York State Teachers Retirement System | 73,322 | $6.31M | 0.01% | −3,604−4.7% | Reduced |
| Algert Global LLC | 72,447 | $6.23M | 0.09% | −129,775−64.2% | Reduced |
| Allspring Global Investments Holdings, LLC | 66,531 | $5.98M | 0.01% | −455,695−87.3% | Reduced |
| Fred Alger Management, LLC | 66,862 | $5.75M | 0.03% | −341−0.5% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 66,044 | $5.68M | 0.01% | −71,648−52.0% | Reduced |
| Munro Partners | 64,395 | $5.54M | 0.19% | +64,395 | New |
| Weiss Asset Management LP | 63,100 | $5.43M | 0.10% | +26,800+73.8% | Added |
| Great West Life Assurance Co | 62,130 | $5.35M | 0.01% | +159+0.3% | Added |
| Thornburg Investment Management Inc | 58,106 | $5.00M | 0.05% | +552+1.0% | Added |
| Loup Funds, LLC | 58,036 | $4.99M | 3.16% | +58,036 | New |
| Penserra Capital Management LLC | 57,161 | $4.92M | 0.06% | +57,161 | New |
| Mackenzie Financial Corp | 53,689 | $4.62M | 0.01% | +29,540+122.3% | Added |
| Vident Advisory, LLC | 51,947 | $4.47M | 0.04% | −14,124−21.4% | Reduced |
| Bridgewater Associates, LP | 51,854 | $4.46M | 0.02% | −102,442−66.4% | Reduced |
| Captrust Financial Advisors | 51,797 | $4.46M | 0.01% | +10,921+26.7% | Added |
| Nicholas Investment Partners, LP | 50,851 | $4.37M | 0.32% | +3,048+6.4% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 50,271 | $4.32M | 0.01% | −7,528−13.0% | Reduced |
| Holocene Advisors, LP | 49,604 | $4.27M | 0.01% | +49,604 | New |
| AI-Squared Management Ltd | 49,578 | $4.27M | 3.10% | +49,578 | New |
| Teachers Retirement System of the State of Kentucky | 49,124 | $4.23M | 0.03% | −236−0.5% | Reduced |
| Vanguard Global Advisers, LLC | 47,982 | $4.13M | 0.00% | +47,982 | New |
| Assenagon Asset Management S.A. | 47,531 | $4.09M | 0.01% | +1,174+2.5% | Added |
| Primecap Management Co | 47,500 | $4.09M | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 46,839 | $4.03M | 0.10% | +22,134+89.6% | Added |
| Amalgamated Bank | 46,548 | $4.00M | 0.03% | +1,209+2.7% | Added |
| American Century Companies Inc | 45,490 | $3.91M | 0.00% | −12,812−22.0% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 44,874 | $3.86M | 0.01% | +8,072+21.9% | Added |
| Hancock Whitney Corp | 33,382 | $3.84M | 0.07% | +2,854+9.3% | Added |
| Raiffeisen Bank International AG | 48,000 | $3.83M | 0.06% | +48,000 | New |
| Pictet Asset Management Holding SA | 43,583 | $3.75M | 0.00% | +2,832+6.9% | Added |
| New York State Common Retirement Fund | 42,938 | $3.69M | 0.01% | +1,000+2.4% | Added |
| Guggenheim Capital LLC | 42,731 | $3.68M | 0.03% | +19,226+81.8% | Added |
| EFG International AG | 42,417 | $3.65M | 0.08% | +4,886+13.0% | Added |
| State of Tennessee, Treasury Department | 42,268 | $3.64M | 0.01% | 00.0% | Unchanged |
| Campbell Newman Asset Management Inc | 41,067 | $3.53M | 0.29% | +721+1.8% | Added |
| Diversify Wealth Management, LLC | 31,253 | $3.51M | 0.06% | +13,470+75.7% | Added |
| Diversified Trust Co | 39,861 | $3.43M | 0.06% | +11,506+40.6% | Added |
| Meiji Yasuda Asset Management Co Ltd. | 39,661 | $3.41M | 0.17% | +37,161+1,486.4% | Added |
| Aspetuck Financial Management LLC | 38,175 | $3.28M | 2.25% | 00.0% | Unchanged |
| Moody Aldrich Partners LLC | 37,335 | $3.21M | 0.58% | +903+2.5% | Added |
| Rice Hall James & Associates, LLC | 37,059 | $3.19M | 0.18% | −7,886−17.5% | Reduced |
| Pacer Advisors, Inc. | 37,001 | $3.18M | 0.01% | +16,542+80.9% | Added |
| State of New Jersey Common Pension Fund D | 36,975 | $3.18M | 0.01% | 00.0% | Unchanged |
| Y-Intercept (Hong Kong) Ltd | 36,901 | $3.17M | 0.06% | +7,451+25.3% | Added |
| Pathstone Holdings, LLC | 36,183 | $3.11M | 0.01% | +9,634+36.3% | Added |
| Future Fund LLC | 34,386 | $2.96M | 1.04% | +34,386 | New |
| Stephens Inc | 32,981 | $2.84M | 0.04% | +3,045+10.2% | Added |
| Yousif Capital Management, LLC | 31,695 | $2.73M | 0.03% | −1,622−4.9% | Reduced |
| Louisiana State Employees Retirement System | 31,200 | $2.68M | 0.05% | +1,400+4.7% | Added |
| Susquehanna Portfolio Strategies, LLC | 30,578 | $2.63M | 0.04% | −1,948−6.0% | Reduced |
| Natixis Advisors, L.P. | 30,567 | $2.63M | 0.00% | +2,201+7.8% | Added |
| ProShare Advisors LLC | 29,844 | $2.57M | 0.00% | −7,926−21.0% | Reduced |
| Arizona State Retirement System | 29,569 | $2.54M | 0.01% | −191−0.6% | Reduced |
| Royal Bank of Canada | 29,542 | $2.54M | 0.00% | −4,462−13.1% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 29,310 | $2.52M | 0.02% | +359+1.2% | Added |
| Ameritas Investment Partners, Inc. | 28,746 | $2.47M | 0.08% | +102+0.4% | Added |
| Cetera Investment Advisers | 28,692 | $2.47M | 0.00% | +301+1.1% | Added |
| South Dakota Investment Council | 28,613 | $2.46M | 0.05% | 00.0% | Unchanged |
| Emerald Investment Advisers, LLC | 28,090 | $2.42M | 0.22% | +28,090 | New |
| New Age Alpha Advisors, LLC | 27,979 | $2.41M | 0.11% | −689−2.4% | Reduced |
| Ensign Peak Advisors, Inc | 27,480 | $2.36M | 0.00% | −960−3.4% | Reduced |
| Fifth Third Bancorp | 27,361 | $2.35M | 0.00% | +25,820+1,675.5% | Added |
| Illinois Municipal Retirement Fund | 27,314 | $2.35M | 0.03% | +2,974+12.2% | Added |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 26,972 | $2.32M | 0.01% | +34+0.1% | Added |
| Vanguard Investments Australia, Ltd. | 26,807 | $2.31M | 0.01% | +26,807 | New |
| State Board of Administration of Florida Retirement System | 26,583 | $2.29M | 0.00% | 00.0% | Unchanged |
| Nissay Asset Management Corp | 26,374 | $2.27M | 0.01% | +269+1.0% | Added |
| Linden Thomas Advisory Services, LLC | 26,221 | $2.26M | 0.22% | −38−0.1% | Reduced |
| SG Americas Securities, LLC | 25,962 | $2.23M | 0.00% | −37,690−59.2% | Reduced |
| Stifel Financial Corp | 25,943 | $2.23M | 0.00% | −3,530−12.0% | Reduced |
| State of Michigan Retirement System | 25,900 | $2.23M | 0.01% | +500+2.0% | Added |
| Hennion & Walsh Asset Management, Inc. | 25,727 | $2.21M | 0.07% | −252−1.0% | Reduced |
| Investors Towarzystwo Funduszy Inwestycyjnych Spolka Akcyjna | 25,700 | $2.21M | 0.91% | −4,050−13.6% | Reduced |
| Elo Mutual Pension Insurance Co | 25,691 | $2.21M | 0.04% | +1,479+6.1% | Added |
| Cerity Partners LLC | 25,687 | $2.21M | 0.00% | −4,789−15.7% | Reduced |
| Quantinno Capital Management LP | 25,621 | $2.20M | 0.00% | +2,219+9.5% | Added |
| Silvercrest Asset Management Group LLC | 25,451 | $2.19M | 0.02% | −224,535−89.8% | Reduced |
| STRS Ohio | 24,300 | $2.09M | 0.01% | −300−1.2% | Reduced |
| US Bancorp | 24,246 | $2.09M | 0.00% | +3,114+14.7% | Added |
| Northwestern Mutual Investment Management Company, LLC | 24,116 | $2.07M | 0.03% | +31+0.1% | Added |
| Baird Financial Group, Inc. | 24,090 | $2.07M | 0.00% | −14,351−37.3% | Reduced |
| CWA Asset Management Group, LLC | 23,967 | $2.06M | 0.07% | +23,967 | New |