Atrium Therapeutics, Inc.
RNA- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0002093101
No open-market purchases or sales by Atrium Therapeutics, Inc. insiders were filed in the last 90 days; 154 institutions reported holding it in 13F filings for Q2 2026, worth $192.8M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Atrium Therapeutics, 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
- 163
- +163 vs. Q4 2025
- Shares held
- 14.8M
- +14.8M vs. Q4 2025
- Total value
- $198.3M
- +$198.3M vs. Q4 2025
- New holders
- 163
- 0 more added
- Sold out
- 0
- 0 more reduced
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting RNA 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 | 154 | $192.8M |
| Q1 2026 | 163 | $198.3M |
| Q4 2025 | 0 | $0 |
| Q3 2025 | 0 | $0 |
| Q2 2025 | 0 | $0 |
| Q1 2025 | 0 | $0 |
| Q4 2024 | 0 | $0 |
| Q3 2024 | 0 | $0 |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Atrium Therapeutics, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Price T Rowe Associates Inc | 1,553,210 | $20.8M | 0.00% | +1,553,210 | New |
| BlackRock, Inc. | 1,205,291 | $16.1M | 0.00% | +1,205,291 | New |
| Ra Capital Management, L.P. | 864,102 | $11.6M | 0.12% | +864,102 | New |
| Vanguard Capital Management LLC | 626,869 | $8.38M | 0.00% | +626,869 | New |
| TIG Advisors, LLC | 607,552 | $8.12M | 0.39% | +607,552 | New |
| Pentwater Capital Management LP | 602,649 | $8.06M | 0.06% | +602,649 | New |
| O'Connor Alternative Investments LLC | 578,011 | $7.73M | 0.41% | +578,011 | New |
| Sessa Capital IM, L.P. | 551,391 | $7.37M | 0.14% | +551,391 | New |
| Goldman Sachs Group Inc | 349,950 | $4.68M | 0.00% | +349,950 | New |
| Farallon Capital Management, L.L.C. | 349,360 | $4.67M | 0.03% | +349,360 | New |
| Vanguard Portfolio Management LLC | 344,369 | $4.60M | 0.00% | +344,369 | New |
| Geode Capital Management, LLC | 319,831 | $4.28M | 0.00% | +319,831 | New |
| 683 Capital Management, LLC | 300,000 | $4.01M | 0.37% | +300,000 | New |
| Bellevue Group AG | 263,096 | $3.52M | 0.08% | +263,096 | New |
| State Street Corp | 257,086 | $3.44M | 0.00% | +257,086 | New |
| Weiss Asset Management LP | 240,701 | $3.22M | 0.06% | +240,701 | New |
| Cantor Fitzgerald, L. P. | 235,637 | $3.15M | 0.11% | +235,637 | New |
| Balyasny Asset Management LLC | 235,115 | $3.14M | 0.01% | +235,115 | New |
| Squarepoint Ops LLC | 231,466 | $3.09M | 0.01% | +231,466 | New |
| Arbiter Partners Capital Management LLC | 230,000 | $3.08M | 2.09% | +230,000 | New |
| Millennium Management LLC | 190,859 | $2.55M | 0.00% | +190,859 | New |
| Adage Capital Partners GP, L.L.C. | 183,580 | $2.45M | 0.00% | +183,580 | New |
| Slotnik Capital, LLC | 180,945 | $2.42M | 0.72% | +180,945 | New |
| CNH Partners LLC | 179,713 | $2.40M | 0.04% | +179,713 | New |
| Two Sigma Investments, LP | 178,560 | $2.39M | 0.00% | +178,560 | New |
| Morgan Stanley | 165,036 | $2.21M | 0.00% | +165,036 | New |
| Schonfeld Strategic Advisors LLC | 162,759 | $2.18M | 0.02% | +162,759 | New |
| Highland Capital Management Fund Advisors, L.P. | 150,025 | $2.01M | 0.14% | +150,025 | New |
| Marble Bar Asset Management LLP | 147,000 | $1.97M | 1.93% | +147,000 | New |
| Janus Henderson Group PLC | 139,973 | $1.87M | 0.00% | +139,973 | New |
| Bracebridge Capital, LLC | 139,239 | $1.86M | 0.33% | +139,239 | New |
| Nomura Holdings Inc | 137,380 | $1.84M | 0.02% | +137,380 | New |
| Bank of America Corp | 136,248 | $1.82M | 0.00% | +136,248 | New |
| Yakira Capital Management, Inc. | 126,645 | $1.69M | 0.50% | +126,645 | New |
| Creek Drive Management Group LLC | 120,000 | $1.60M | 1.01% | +120,000 | New |
| Charles Schwab Investment Management Inc | 116,598 | $1.56M | 0.00% | +116,598 | New |
| TD Asset Management Inc | 111,200 | $1.49M | 0.00% | +111,200 | New |
| Citadel Advisors LLC | 109,936 | $1.47M | 0.00% | +109,936 | New |
| Athos Capital Ltd | 107,965 | $1.44M | 0.45% | +107,965 | New |
| Caption Management, LLC | 103,592 | $1.39M | 0.07% | +103,592 | New |
| Northern Trust Corp | 98,585 | $1.32M | 0.00% | +98,585 | New |
| Vanguard Fiduciary Trust Co | 95,128 | $1.27M | 0.00% | +95,128 | New |
| FIL Ltd | 78,500 | $1.05M | 0.00% | +78,500 | New |
| ExodusPoint Capital Management, LP | 77,442 | $1.04M | 0.01% | +77,442 | New |
| Tudor Investment Corp Et Al | 71,359 | $954.1K | 0.01% | +71,359 | New |
| Polar Asset Management Partners Inc. | 70,000 | $935.9K | 0.02% | +70,000 | New |
| Neuberger Berman Group LLC | 69,294 | $926.5K | 0.00% | +69,294 | New |
| Quarry LP | 66,651 | $891.1K | 0.18% | +66,651 | New |
| Manufacturers Life Insurance Company, The | 62,379 | $834.0K | 0.00% | +62,379 | New |
| ADAR1 Capital Management, LLC | 57,688 | $771.0K | 0.05% | +57,688 | New |
| Westchester Capital Management, LLC | 55,236 | $738.5K | 0.04% | +55,236 | New |
| AWM Investment Company, Inc. | 50,000 | $668.5K | 0.07% | +50,000 | New |
| Twin Securities, Inc. | 49,913 | $667.3K | 0.33% | +49,913 | New |
| UBS Group AG | 49,814 | $666.0K | 0.00% | +49,814 | New |
| Oddo BHF Asset Management SAS | 45,090 | $602.9K | 0.02% | +45,090 | New |
| Caxton Associates LLP | 44,230 | $591.4K | 0.01% | +44,230 | New |
| Alethea Capital Management, LLC | 43,758 | $585.0K | 0.31% | +43,758 | New |
| Bank of New York Mellon Corp | 43,697 | $584.2K | 0.00% | +43,697 | New |
| Canada Pension Plan Investment Board | 41,970 | $561.1K | 0.00% | +41,970 | New |
| Highbridge Capital Management LLC | 40,986 | $555.4K | 0.04% | +40,986 | New |
| Saba Capital Management, L.P. | 39,640 | $530.0K | 0.02% | +39,640 | New |
| Fifth Lane Capital, LP | 35,999 | $481.3K | 0.58% | +35,999 | New |
| Royal Bank of Canada | 35,698 | $477.0K | 0.00% | +35,698 | New |
| Kennedy Capital Management, Inc. | 33,977 | $454.3K | 0.01% | +33,977 | New |
| Marshall Wace, LLP | 33,691 | $450.4K | 0.00% | +33,691 | New |
| LMR Partners LLP | 32,500 | $434.5K | 0.00% | +32,500 | New |
| Brevan Howard Capital Management LP | 31,644 | $423.1K | 0.00% | +31,644 | New |
| Groupe la Francaise | 29,698 | $397.1K | 0.01% | +29,698 | New |
| FMR LLC | 29,292 | $391.6K | 0.00% | +29,292 | New |
| Woodline Partners LP | 28,845 | $385.7K | 0.00% | +28,845 | New |
| Nuveen, LLC | 25,307 | $338.4K | 0.00% | +25,307 | New |
| Cannon Global Investment Management, LLC | 25,087 | $335.4K | 0.81% | +25,087 | New |
| Credit Industriel Et Commercial | 23,000 | $307.5K | 0.05% | +23,000 | New |
| Point72 Asset Management, L.P. | 22,708 | $303.6K | 0.00% | +22,708 | New |
| Fortress Investment Group LLC | 22,033 | $294.6K | 0.08% | +22,033 | New |
| Healthcare of Ontario Pension Plan Trust Fund | 20,590 | $275.3K | 0.00% | +20,590 | New |
| Fractal Investments LLC | 20,000 | $267.4K | 0.03% | +20,000 | New |
| Jane Street Group, LLC | 19,955 | $266.8K | 0.00% | +19,955 | New |
| Vestcor Inc | 17,499 | $234.0K | 0.01% | +17,499 | New |
| Grantham, Mayo, Van Otterloo & Co. LLC | 15,444 | $206.5K | 0.00% | +15,444 | New |
| Rhumbline Advisers | 14,953 | $199.9K | 0.00% | +14,953 | New |
| AlphaCentric Advisors LLC | 13,286 | $177.6K | 0.18% | +13,286 | New |
| Susquehanna Portfolio Strategies, LLC | 13,110 | $175.3K | 0.00% | +13,110 | New |
| Alliancebernstein L.P. | 12,970 | $173.4K | 0.00% | +12,970 | New |
| Public Sector Pension Investment Board | 12,882 | $172.2K | 0.00% | +12,882 | New |
| Quantinno Capital Management LP | 12,454 | $166.5K | 0.00% | +12,454 | New |
| JPMorgan Chase & Co | 12,038 | $163.1K | 0.00% | +12,038 | New |
| AlphaGrep UK Ltd | 11,870 | $158.7K | 0.05% | +11,870 | New |
| Wells Fargo & Company | 11,416 | $152.6K | 0.00% | +11,416 | New |
| Susquehanna International Group, LLP | 11,343 | $151.7K | 0.00% | +11,343 | New |
| Magnetar Financial LLC | 10,512 | $140.5K | 0.00% | +10,512 | New |
| Invesco Ltd. | 10,193 | $136.3K | 0.00% | +10,193 | New |
| Deutsche Bank AG | 10,019 | $134.0K | 0.00% | +10,019 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 9,488 | $126.9K | 0.00% | +9,488 | New |
| MetLife Investment Management | 8,845 | $118.3K | 0.00% | +8,845 | New |
| BNP Paribas Arbitrage, SA | 8,267 | $110.5K | 0.00% | +8,267 | New |
| Centiva Capital, LP | 5,895 | $78.8K | 0.00% | +5,895 | New |
| Legal & General Group Plc | 5,657 | $75.6K | 0.00% | +5,657 | New |
| Vanguard Global Advisers, LLC | 5,585 | $74.7K | 0.00% | +5,585 | New |
| Russell Investments Group, Ltd. | 3,839 | $51.3K | 0.00% | +3,839 | New |