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 $211.9M in total; no superinvestor holds it.
13F holders, Q2 2026
Institutional positions in Atrium Therapeutics, Inc. as of Jun 30, 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
- 154
- −7 vs. Q1 2026
- Shares held
- 15.8M
- +1.06M (+7.2%) vs. Q1 2026
- Total value
- $211.9M
- +$15.4M (+7.8%) vs. Q1 2026
- New holders
- 39
- 47 more added
- Sold out
- 46
- 35 more reduced
2 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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 | $211.9M |
| 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, Q2 2026
Shares, value and share of portfolio for each institution holding Atrium Therapeutics, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Sessa Capital IM, L.P. | 1,500,000 | $20.2M | 0.35% | +948,609+172.0% | Added |
| Price T Rowe Associates Inc | 1,472,984 | $19.8M | 0.00% | −80,226−5.2% | Reduced |
| BlackRock, Inc. | 1,447,476 | $19.5M | 0.00% | +242,185+20.1% | Added |
| CRCM LP | 1,283,078 | $17.3M | 5.68% | +1,283,078 | New |
| Arbiter Partners Capital Management LLC | 783,864 | $10.5M | 1.92% | +553,864+240.8% | Added |
| Vanguard Capital Management LLC | 730,831 | $9.83M | 0.00% | +103,962+16.6% | Added |
| TIG Advisors, LLC | 561,533 | $7.55M | 0.35% | −46,019−7.6% | Reduced |
| Cantor Fitzgerald, L. P. | 513,834 | $6.91M | 0.07% | +278,197+118.1% | Added |
| Geode Capital Management, LLC | 386,929 | $5.21M | 0.00% | +67,098+21.0% | Added |
| Two Sigma Investments, LP | 345,481 | $4.65M | 0.00% | +166,921+93.5% | Added |
| Goldman Sachs Group Inc | 310,341 | $4.17M | 0.00% | −39,609−11.3% | Reduced |
| 683 Capital Management, LLC | 300,000 | $4.04M | 0.37% | 00.0% | Unchanged |
| State Street Corp | 271,762 | $3.66M | 0.00% | +14,676+5.7% | Added |
| Slotnik Capital, LLC | 237,637 | $3.20M | 0.89% | +56,692+31.3% | Added |
| Weiss Asset Management LP | 219,730 | $2.96M | 0.03% | −20,971−8.7% | Reduced |
| Millennium Management LLC | 200,559 | $2.70M | 0.00% | +9,700+5.1% | Added |
| Schonfeld Strategic Advisors LLC | 199,158 | $2.68M | 0.01% | +36,399+22.4% | Added |
| AQR Capital Management LLC | 172,235 | $2.32M | 0.00% | +172,235 | New |
| Highland Capital Management Fund Advisors, L.P. | 150,025 | $2.02M | 0.13% | 00.0% | Unchanged |
| Polar Asset Management Partners Inc. | 150,000 | $2.02M | 0.04% | +80,000+114.3% | Added |
| Squarepoint Ops LLC | 146,743 | $1.97M | 0.00% | −84,723−36.6% | Reduced |
| Bracebridge Capital, LLC | 139,239 | $1.87M | 0.41% | 00.0% | Unchanged |
| Nomura Holdings Inc | 137,394 | $1.85M | 0.01% | +140.0% | Added |
| Yakira Capital Management, Inc. | 133,047 | $1.79M | 0.53% | +6,402+5.1% | Added |
| Bank of America Corp | 132,833 | $1.79M | 0.00% | −3,415−2.5% | Reduced |
| Charles Schwab Investment Management Inc | 130,217 | $1.75M | 0.00% | +13,619+11.7% | Added |
| Tudor Investment Corp Et Al | 129,591 | $1.74M | 0.01% | +58,232+81.6% | Added |
| DAFNA Capital Management LLC | 128,000 | $1.72M | 0.33% | +128,000 | New |
| Creek Drive Management Group LLC | 127,600 | $1.72M | 1.06% | +7,600+6.3% | Added |
| Norges Bank | 126,575 | $1.70M | 0.00% | +126,575 | New |
| Anson Funds Management LP | 125,000 | $1.68M | 0.15% | +125,000 | New |
| Northern Trust Corp | 119,781 | $1.61M | 0.00% | +21,196+21.5% | Added |
| ExodusPoint Capital Management, LP | 117,275 | $1.58M | 0.01% | +39,833+51.4% | Added |
| Trium Capital LLP | 113,278 | $1.52M | 0.96% | +113,278 | New |
| TD Asset Management Inc | 111,200 | $1.50M | 0.00% | 00.0% | Unchanged |
| Vanguard Fiduciary Trust Co | 109,961 | $1.48M | 0.00% | +14,833+15.6% | Added |
| Jane Street Group, LLC | 109,810 | $1.48M | 0.00% | +89,855+450.3% | Added |
| Athos Capital Ltd | 107,965 | $1.45M | 0.52% | 00.0% | Unchanged |
| AWM Investment Company, Inc. | 107,500 | $1.45M | 0.13% | +57,500+115.0% | Added |
| Balyasny Asset Management LLC | 105,875 | $1.42M | 0.00% | −129,240−55.0% | Reduced |
| Marble Bar Asset Management LLP | 103,849 | $1.40M | 0.97% | −43,151−29.4% | Reduced |
| Vanguard Portfolio Management LLC | 101,195 | $1.36M | 0.00% | −243,174−70.6% | Reduced |
| Adage Capital Partners GP, L.L.C. | 100,000 | $1.34M | 0.00% | −83,580−45.5% | Reduced |
| BlueCrest Capital Management Ltd | 100,000 | $1.34M | 0.06% | +100,000 | New |
| Credit Industriel Et Commercial | 89,723 | $1.21M | 0.13% | +66,723+290.1% | Added |
| Groupe la Francaise | 80,273 | $1.08M | 0.01% | +50,575+170.3% | Added |
| FIL Ltd | 76,500 | $1.03M | 0.00% | −2,000−2.5% | Reduced |
| Caption Management, LLC | 75,277 | $1.01M | 0.04% | −28,315−27.3% | Reduced |
| Citadel Advisors LLC | 67,639 | $909.7K | 0.00% | −42,297−38.5% | Reduced |
| Manufacturers Life Insurance Company, The | 62,853 | $845.4K | 0.00% | +474+0.8% | Added |
| ADAR1 Capital Management, LLC | 57,688 | $775.9K | 0.04% | 00.0% | Unchanged |
| Franklin Resources Inc | 56,699 | $762.6K | 0.00% | +56,699 | New |
| Jacobs Levy Equity Management, Inc | 53,992 | $726.2K | 0.00% | +53,992 | New |
| Oddo BHF Asset Management SAS | 45,090 | $606.5K | 0.03% | 00.0% | Unchanged |
| Caxton Associates LLP | 44,230 | $594.9K | 0.01% | 00.0% | Unchanged |
| Alethea Capital Management, LLC | 43,758 | $588.5K | 0.24% | 00.0% | Unchanged |
| Canada Pension Plan Investment Board | 41,970 | $564.5K | 0.00% | 00.0% | Unchanged |
| Morgan Stanley | 41,942 | $564.1K | 0.00% | −123,094−74.6% | Reduced |
| Saba Capital Management, L.P. | 39,640 | $533.2K | 0.02% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 39,252 | $527.9K | 0.00% | −4,445−10.2% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 35,103 | $472.1K | 0.01% | +35,103 | New |
| Kennedy Capital Management, Inc. | 34,979 | $470.5K | 0.01% | +1,002+2.9% | Added |
| FMR LLC | 33,532 | $451.0K | 0.00% | +4,240+14.5% | Added |
| Moran Wealth Management, LLC | 33,320 | $448.2K | 0.01% | +33,320 | New |
| Boussard & Gavaudan Gestion SAS | 32,845 | $447.2K | 0.02% | +32,845 | New |
| LMR Partners LLP | 32,500 | $437.1K | 0.00% | 00.0% | Unchanged |
| Los Angeles Capital Management LLC | 31,477 | $423.4K | 0.00% | +31,477 | New |
| Nuveen, LLC | 31,071 | $417.9K | 0.00% | +5,764+22.8% | Added |
| Jump Financial, LLC | 31,017 | $417.2K | 0.00% | +31,017 | New |
| Quantinno Capital Management LP | 27,418 | $368.8K | 0.00% | +14,964+120.2% | Added |
| Twin Securities, Inc. | 26,517 | $356.7K | 0.18% | −23,396−46.9% | Reduced |
| Odyssean, LLC | 21,233 | $285.6K | 0.05% | +21,233 | New |
| Brevan Howard Capital Management LP | 20,834 | $280.2K | 0.00% | −10,810−34.2% | Reduced |
| Fractal Investments LLC | 20,000 | $269.0K | 0.03% | 00.0% | Unchanged |
| UBS Group AG | 19,572 | $263.2K | 0.00% | −30,242−60.7% | Reduced |
| Healthcare of Ontario Pension Plan Trust Fund | 18,590 | $250.0K | 0.00% | −2,000−9.7% | Reduced |
| Vestcor Inc | 17,499 | $235.0K | 0.01% | 00.0% | Unchanged |
| Wells Fargo & Company | 17,451 | $234.7K | 0.00% | +6,035+52.9% | Added |
| Alliancebernstein L.P. | 17,110 | $228.8K | 0.00% | +4,140+31.9% | Added |
| Rhumbline Advisers | 16,579 | $223.0K | 0.00% | +1,626+10.9% | Added |
| Bluefin Capital Management, LLC | 16,011 | $215.3K | 0.06% | +16,011 | New |
| Renaissance Technologies LLC | 14,971 | $201.4K | 0.00% | +14,971 | New |
| Deutsche Bank AG | 14,967 | $201.3K | 0.00% | +4,948+49.4% | Added |
| Invesco Ltd. | 14,174 | $190.6K | 0.00% | +3,981+39.1% | Added |
| Jupiter Topco LLC | 13,833 | $185.6K | 0.00% | +13,833 | New |
| AlphaCentric Advisors LLC | 13,478 | $181.3K | 0.15% | +192+1.4% | Added |
| Axq Capital, LP | 11,377 | $153.0K | 0.02% | +11,377 | New |
| Kestra Private Wealth Services, LLC | 10,370 | $139.5K | 0.00% | +10,370 | New |
| MetLife Investment Management | 10,283 | $138.3K | 0.00% | +1,438+16.3% | Added |
| Corsicana & Co. | 9,820 | $132.1K | 0.06% | +9,820 | New |
| JPMorgan Chase & Co | 9,388 | $128.1K | 0.00% | −2,650−22.0% | Reduced |
| BNP Paribas Arbitrage, SA | 7,901 | $106.3K | 0.00% | −366−4.4% | Reduced |
| Citigroup Inc | 6,685 | $89.9K | 0.00% | +6,047+947.8% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 6,602 | $88.8K | 0.00% | −2,886−30.4% | Reduced |
| Vanguard Global Advisers, LLC | 5,585 | $75.1K | 0.00% | 00.0% | Unchanged |
| Russell Investments Group, Ltd. | 4,475 | $60.2K | 0.00% | +636+16.6% | Added |
| Skandinaviska Enskilda Banken AB (publ) | 4,400 | $59.2K | 0.00% | +4,400 | New |
| Walleye Trading LLC | 3,978 | $53.5K | 0.00% | +350+9.6% | Added |
| Erste Asset Management GmbH | 3,600 | $49.1K | 0.00% | 00.0% | Unchanged |
| Quantbot Technologies LP | 3,614 | $48.6K | 0.00% | +3,614 | New |