RMBS Rambus, Inc.
Rambus, Inc. (RMBS) Institutional Ownership
What the institutions did with RMBS last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 14.0M | 13.9% |
| FMR LLC | 10.5M | 10.4% |
| Invesco Ltd. | 6.6M | 6.6% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 6.1M | 6.0% |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.9M | 4.8% |
| STATE STREET CORP | 3.9M | 3.9% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 3.3M | 3.3% |
| GEODE CAPITAL MANAGEMENT, LLC | 2.3M | 2.3% |
| JPMORGAN CHASE & CO | 2.1M | 2.1% |
| DIMENSIONAL FUND ADVISORS LP | 1.7M | 1.7% |
| Swedbank AB | 1.6M | 1.6% |
| NORGES BANK | 1.5M | 1.5% |
| MORGAN STANLEY | 1.4M | 1.4% |
| NEUBERGER BERMAN GROUP LLC | 1.3M | 1.3% |
| BANK OF AMERICA CORP /DE/ | 1.2M | 1.2% |
| AQR CAPITAL MANAGEMENT LLC | 1.2M | 1.2% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.1M | 1.1% |
| EdgePoint Investment Group Inc. | 1.1M | 1.1% |
| Rafferty Asset Management, LLC | 984.4K | 1.0% |
| GOLDMAN SACHS GROUP INC | 960.9K | 1.0% |
| BESSEMER GROUP INC | 958.9K | 1.0% |
| NORTHERN TRUST CORP | 949.1K | 0.9% |
| Bank of New York Mellon Corp | 828.2K | 0.8% |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | 797.2K | 0.8% |
| CONGRESS ASSET MANAGEMENT CO | 778.0K | 0.8% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| FMR LLC | Increased | 3.3M | 10.5M | +7.1M |
| T. Rowe Price Investment Management, Inc. | Sold Out | 2.4M | 0 | -2.4M |
| BlackRock, Inc. | Reduced | 16.3M | 14.0M | -2.3M |
| EdgePoint Investment Group Inc. | Reduced | 1.9M | 1.1M | -861.5K |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 3.1M | 2.3M | -826.8K |
| Hood River Capital Management LLC | Sold Out | 727.5K | 0 | -727.5K |
| D. E. Shaw & Co., Inc. | Increased | 12.8K | 739.7K | +726.9K |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | Increased | 102.4K | 797.2K | +694.8K |
| VOYA INVESTMENT MANAGEMENT LLC | Reduced | 765.8K | 99.8K | -666.0K |
| AMERIPRISE FINANCIAL INC | Reduced | 975.2K | 321.2K | -654.0K |
| UBS Group AG | Reduced | 956.4K | 373.6K | -582.8K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 6.6M | 6.1M | -575.8K |
| CONGRESS ASSET MANAGEMENT CO | Reduced | 1.3M | 778.0K | -498.0K |
| CITIGROUP INC | Reduced | 1.0M | 532.4K | -475.1K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 85.8K | 555.9K | +470.1K |
| STATE STREET CORP | Reduced | 4.4M | 3.9M | -458.5K |
| BARCLAYS PLC | Reduced | 1.1M | 646.0K | -449.7K |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 856.6K | 418.5K | -438.1K |
| HRT FINANCIAL LP | New | 0 | 430.2K | +430.2K |
| PANAGORA ASSET MANAGEMENT INC | Reduced | 436.4K | 10.2K | -426.2K |
| Nuveen, LLC | Reduced | 892.3K | 496.4K | -395.9K |
| NORTHERN TRUST CORP | Reduced | 1.3M | 949.1K | -385.0K |
| CITADEL ADVISORS LLC | Increased | 16.5K | 400.2K | +383.7K |
| WESTFIELD CAPITAL MANAGEMENT CO LP | Increased | 14.4K | 385.8K | +371.4K |
| Maple Rock Capital Partners Inc. | New | 0 | 342.6K | +342.6K |
| MILLENNIUM MANAGEMENT LLC | Increased | 141.3K | 472.8K | +331.5K |
| SCHWARTZ INVESTMENT COUNSEL INC | Reduced | 420.3K | 100.0K | -320.3K |
| JPMORGAN CHASE & CO | Increased | 1.8M | 2.1M | +264.9K |
| GILDER GAGNON HOWE & CO LLC | New | 0 | 257.4K | +257.4K |
| FRANKLIN RESOURCES INC | Reduced | 323.4K | 74.0K | -249.3K |
| EMERALD ADVISERS, LLC | Reduced | 493.2K | 252.7K | -240.5K |
| Rafferty Asset Management, LLC | Increased | 745.5K | 984.4K | +238.9K |
| MORGAN STANLEY | Increased | 1.2M | 1.4M | +231.1K |
| LORD, ABBETT & CO. LLC | Reduced | 387.1K | 158.3K | -228.9K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Reduced | 1.3M | 1.1M | -217.3K |
| Granahan Investment Management, LLC | Reduced | 280.2K | 66.2K | -214.0K |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | New | 0 | 200.1K | +200.1K |
| LOOMIS SAYLES & CO L P | Reduced | 659.8K | 470.9K | -188.9K |
| MACKENZIE FINANCIAL CORP | Increased | 53.7K | 242.2K | +188.5K |
| RAYMOND JAMES FINANCIAL INC | Reduced | 791.0K | 603.9K | -187.1K |
| FEDERATED HERMES, INC. | Reduced | 215.4K | 35.6K | -179.8K |
| Duquesne Family Office LLC | New | 0 | 173.0K | +173.0K |
| ArrowMark Colorado Holdings LLC | Reduced | 261.7K | 89.5K | -172.2K |
| EMERALD MUTUAL FUND ADVISERS TRUST | Reduced | 307.2K | 139.3K | -168.0K |
| Caisse de depot et placement du Quebec | Reduced | 448.6K | 282.6K | -166.0K |
| Allianz Asset Management GmbH | Increased | 89.1K | 254.9K | +165.8K |
| GLENMEDE TRUST CO NA | Reduced | 159.1K | 2.0K | -157.2K |
| TUDOR INVESTMENT CORP ET AL | New | 0 | 157.2K | +157.2K |
| STEADFAST CAPITAL MANAGEMENT LP | Sold Out | 153.3K | 0 | -153.3K |
| TWO SIGMA INVESTMENTS, LP | Increased | 77.4K | 222.9K | +145.5K |
| BANK OF AMERICA CORP /DE/ | Reduced | 1.4M | 1.2M | -142.8K |
| ROYAL BANK OF CANADA | Increased | 29.5K | 169.5K | +139.9K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Increased | 13.0K | 150.2K | +137.2K |
| Invesco Ltd. | Increased | 6.5M | 6.6M | +133.4K |
| CANADA PENSION PLAN INVESTMENT BOARD | Increased | 199.4K | 330.6K | +131.2K |
| TD Asset Management Inc | Sold Out | 120.3K | 0 | -120.3K |
| Tairen Capital Ltd | Sold Out | 120.0K | 0 | -120.0K |
| ALLIANCEBERNSTEIN L.P. | Reduced | 267.2K | 155.1K | -112.1K |
| WESTWOOD HOLDINGS GROUP INC | Reduced | 369.2K | 260.1K | -109.1K |
| SCHRODER INVESTMENT MANAGEMENT GROUP | Reduced | 108.6K | 2.4K | -106.2K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.