Who owns Atrium Therapeutics, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of RNA from SEC Form 13F filings across 154 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 154 institutions disclosed 14.3M shares of Atrium Therapeutics, Inc. worth $192.8M — about 83.8% of shares outstanding; the largest disclosed holder is Sessa Capital IM, L.P.. Source: SEC Form 13F filings, parsed by EvidInvest.
154
13F holders
$192.8M
value, 2026 filers
83.8%
of shares outstanding (14.3M sh)
41
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of RNA's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Sessa Capital IM, L.P. | 1.5M | $20.2M | 0.3% | 8.8% | +172.0% |
| 2 | PRICE T ROWE ASSOCIATES INC /MD/ | 1.5M | $19.8M | 0.0% | 8.6% | -5.2% |
| 3 | BlackRock, Inc. | 1.4M | $19.5M | 0.0% | 8.5% | +20.1% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 730,831 | $9.8M | 0.0% | 4.3% | +16.6% |
| 5 | CRCM LPNEW | 641,539 | $8.6M | 5.7% | 3.8% | new |
| 6 | TIG Advisors, LLC | 561,533 | $7.6M | 0.3% | 3.3% | -7.6% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 386,929 | $5.2M | 0.0% | 2.3% | +21.0% |
| 8 | TWO SIGMA INVESTMENTS, LP | 345,481 | $4.6M | 0.0% | 2% | +93.5% |
| 9 | GOLDMAN SACHS GROUP INC | 310,341 | $4.2M | 0.0% | 1.8% | -11.3% |
| 10 | 683 Capital Management, LLC | 300,000 | $4.0M | 0.2% | 1.8% | 0.0% |
| 11 | STATE STREET CORP | 271,762 | $3.7M | 0.0% | 1.6% | +5.7% |
| 12 | Arbiter Partners Capital Management LLC | 261,288 | $3.5M | 1.9% | 1.5% | +13.6% |
| 13 | CANTOR FITZGERALD, L. P. | 256,917 | $3.5M | 0.0% | 1.5% | +9.0% |
| 14 | Slotnik Capital, LLC | 237,637 | $3.2M | 0.8% | 1.4% | +31.3% |
| 15 | Weiss Asset Management LP | 219,730 | $3.0M | 0.0% | 1.3% | -8.7% |
| 16 | MILLENNIUM MANAGEMENT LLC | 200,559 | $2.7M | 0.0% | 1.2% | +5.1% |
| 17 | Schonfeld Strategic Advisors LLC | 199,158 | $2.7M | 0.0% | 1.2% | +22.4% |
| 18 | AQR CAPITAL MANAGEMENT LLCNEW | 172,235 | $2.3M | 0.0% | 1% | new |
| 19 | NEXPOINT ASSET MANAGEMENT, L.P. | 150,025 | $2.0M | 0.1% | 0.9% | 0.0% |
| 20 | Polar Asset Management Partners Inc. | 150,000 | $2.0M | 0.0% | 0.9% | +114.3% |
| 21 | Squarepoint Ops LLC | 146,743 | $2.0M | 0.0% | 0.9% | -36.6% |
| 22 | Bracebridge Capital, LLC | 139,239 | $1.9M | 0.0% | 0.8% | 0.0% |
| 23 | NOMURA HOLDINGS INC | 137,394 | $1.8M | 0.0% | 0.8% | 0.0% |
| 24 | Yakira Capital Management, Inc. | 133,047 | $1.8M | 0.5% | 0.8% | +5.1% |
| 25 | BANK OF AMERICA CORP /DE/ | 132,833 | $1.8M | 0.0% | 0.8% | -2.5% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.