RNA Atrium Therapeutics, Inc.
Atrium Therapeutics, Inc. (RNA) Institutional Ownership
What the institutions did with RNA 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 |
|---|---|---|
| Sessa Capital IM, L.P. | 1.5M | 9.7% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.5M | 9.5% |
| BlackRock, Inc. | 1.4M | 9.3% |
| CRCM LP | 1.3M | 8.3% |
| VANGUARD CAPITAL MANAGEMENT LLC | 730.8K | 4.7% |
| TIG Advisors, LLC | 561.5K | 3.6% |
| Arbiter Partners Capital Management LLC | 522.6K | 3.4% |
| CANTOR FITZGERALD, L. P. | 513.8K | 3.3% |
| GEODE CAPITAL MANAGEMENT, LLC | 386.9K | 2.5% |
| TWO SIGMA INVESTMENTS, LP | 345.5K | 2.2% |
| GOLDMAN SACHS GROUP INC | 310.3K | 2.0% |
| 683 Capital Management, LLC | 300.0K | 1.9% |
| STATE STREET CORP | 271.8K | 1.8% |
| Slotnik Capital, LLC | 237.6K | 1.5% |
| Weiss Asset Management LP | 219.7K | 1.4% |
| MILLENNIUM MANAGEMENT LLC | 200.6K | 1.3% |
| Schonfeld Strategic Advisors LLC | 199.2K | 1.3% |
| AQR CAPITAL MANAGEMENT LLC | 172.2K | 1.1% |
| NEXPOINT ASSET MANAGEMENT, L.P. | 150.0K | 1.0% |
| Polar Asset Management Partners Inc. | 150.0K | 1.0% |
| Squarepoint Ops LLC | 146.7K | 0.9% |
| Bracebridge Capital, LLC | 139.2K | 0.9% |
| NOMURA HOLDINGS INC | 137.4K | 0.9% |
| Yakira Capital Management, Inc. | 133.0K | 0.9% |
| BANK OF AMERICA CORP /DE/ | 132.8K | 0.9% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| CRCM LP | New | 0 | 1.3M | +1.3M |
| Sessa Capital IM, L.P. | Increased | 551.4K | 1.5M | +948.6K |
| RA CAPITAL MANAGEMENT, L.P. | Sold Out | 864.1K | 0 | -864.1K |
| Pentwater Capital Management LP | Sold Out | 602.6K | 0 | -602.6K |
| O'Connor Alternative Investments LLC | Sold Out | 578.0K | 0 | -578.0K |
| FARALLON CAPITAL MANAGEMENT LLC | Sold Out | 349.4K | 0 | -349.4K |
| Arbiter Partners Capital Management LLC | Increased | 230.0K | 522.6K | +292.6K |
| CANTOR FITZGERALD, L. P. | Increased | 235.6K | 513.8K | +278.2K |
| Bellevue Group AG | Sold Out | 263.1K | 0 | -263.1K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 344.4K | 101.2K | -243.2K |
| BlackRock, Inc. | Increased | 1.2M | 1.4M | +242.2K |
| AQR Arbitrage LLC | Sold Out | 179.7K | 0 | -179.7K |
| AQR CAPITAL MANAGEMENT LLC | New | 0 | 172.2K | +172.2K |
| TWO SIGMA INVESTMENTS, LP | Increased | 178.6K | 345.5K | +166.9K |
| Balyasny Asset Management L.P. | Reduced | 235.1K | 105.9K | -129.2K |
| DAFNA Capital Management LLC | New | 0 | 128.0K | +128.0K |
| Anson Funds Management LP | New | 0 | 125.0K | +125.0K |
| MORGAN STANLEY | Reduced | 165.0K | 41.9K | -123.1K |
| Trium Capital LLP | New | 0 | 113.3K | +113.3K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 626.9K | 730.8K | +104.0K |
| BlueCrest Capital Management Ltd | New | 0 | 100.0K | +100.0K |
| JANE STREET GROUP, LLC | Increased | 20.0K | 109.8K | +89.9K |
| Squarepoint Ops LLC | Reduced | 231.5K | 146.7K | -84.7K |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Reduced | 183.6K | 100.0K | -83.6K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | 1.6M | 1.5M | -80.2K |
| Polar Asset Management Partners Inc. | Increased | 70.0K | 150.0K | +80.0K |
| NEUBERGER BERMAN GROUP LLC | Sold Out | 69.3K | 0 | -69.3K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 319.8K | 386.9K | +67.1K |
| CREDIT INDUSTRIEL ET COMMERCIAL | Increased | 23.0K | 89.7K | +66.7K |
| Quarry LP | Sold Out | 66.7K | 0 | -66.7K |
| TUDOR INVESTMENT CORP ET AL | Increased | 71.4K | 129.6K | +58.2K |
| AWM Investment Company, Inc. | Increased | 50.0K | 107.5K | +57.5K |
| FRANKLIN RESOURCES INC | New | 0 | 56.7K | +56.7K |
| Slotnik Capital, LLC | Increased | 180.9K | 237.6K | +56.7K |
| Westchester Capital Management, LLC | Sold Out | 55.2K | 0 | -55.2K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | New | 0 | 54.0K | +54.0K |
| Groupe la Francaise | Increased | 29.7K | 80.3K | +50.6K |
| TIG Advisors, LLC | Reduced | 607.6K | 561.5K | -46.0K |
| Marble Bar Asset Management LLP | Reduced | 147.0K | 103.8K | -43.2K |
| CITADEL ADVISORS LLC | Reduced | 109.9K | 67.6K | -42.3K |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | Sold Out | 41.0K | 0 | -41.0K |
| ExodusPoint Capital Management, LP | Increased | 77.4K | 117.3K | +39.8K |
| GOLDMAN SACHS GROUP INC | Reduced | 350.0K | 310.3K | -39.6K |
| Schonfeld Strategic Advisors LLC | Increased | 162.8K | 199.2K | +36.4K |
| FIFTH LANE CAPITAL, LP | Sold Out | 36.0K | 0 | -36.0K |
| Y-Intercept (Hong Kong) Ltd | New | 0 | 35.1K | +35.1K |
| ROYAL BANK OF CANADA | Reduced | 35.7K | 600 | -35.1K |
| MARSHALL WACE, LLP | Sold Out | 33.7K | 0 | -33.7K |
| Moran Wealth Management, LLC | New | 0 | 33.3K | +33.3K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | New | 0 | 31.5K | +31.5K |
| Jump Financial, LLC | New | 0 | 31.0K | +31.0K |
| UBS Group AG | Reduced | 49.8K | 19.6K | -30.2K |
| Woodline Partners LP | Sold Out | 28.8K | 0 | -28.8K |
| Caption Management, LLC | Reduced | 103.6K | 75.3K | -28.3K |
| Cannon Global Investment Management, LLC | Sold Out | 25.1K | 0 | -25.1K |
| Twin Securities, Inc. | Reduced | 49.9K | 26.5K | -23.4K |
| Point72 Asset Management, L.P. | Sold Out | 22.7K | 0 | -22.7K |
| Fortress Investment Group LLC | Sold Out | 22.0K | 0 | -22.0K |
| Odyssean, LLC | New | 0 | 21.2K | +21.2K |
| NORTHERN TRUST CORP | Increased | 98.6K | 119.8K | +21.2K |
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.