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, 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
- 14.3M
- −362.1K (−2.5%) vs. Q1 2026
- Total value
- $192.8M
- −$3.70M (−1.9%) 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 | $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, 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 |
|---|---|---|---|---|---|
| Oddo BHF Asset Management SAS | 45,090 | $606.5K | 0.03% | 00.0% | Unchanged |
| Jacobs Levy Equity Management, Inc | 53,992 | $726.2K | 0.00% | +53,992 | New |
| Franklin Resources Inc | 56,699 | $762.6K | 0.00% | +56,699 | New |
| ADAR1 Capital Management, LLC | 57,688 | $775.9K | 0.04% | 00.0% | Unchanged |
| Manufacturers Life Insurance Company, The | 62,853 | $845.4K | 0.00% | +474+0.8% | Added |
| Citadel Advisors LLC | 67,639 | $909.7K | 0.00% | −42,297−38.5% | Reduced |
| Caption Management, LLC | 75,277 | $1.01M | 0.04% | −28,315−27.3% | Reduced |
| FIL Ltd | 76,500 | $1.03M | 0.00% | −2,000−2.5% | Reduced |
| Groupe la Francaise | 80,273 | $1.08M | 0.01% | +50,575+170.3% | Added |
| Credit Industriel Et Commercial | 89,723 | $1.21M | 0.13% | +66,723+290.1% | Added |
| 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 |
| Vanguard Portfolio Management LLC | 101,195 | $1.36M | 0.00% | −243,174−70.6% | Reduced |
| Marble Bar Asset Management LLP | 103,849 | $1.40M | 0.97% | −43,151−29.4% | Reduced |
| Balyasny Asset Management LLC | 105,875 | $1.42M | 0.00% | −129,240−55.0% | Reduced |
| AWM Investment Company, Inc. | 107,500 | $1.45M | 0.13% | +57,500+115.0% | Added |
| Athos Capital Ltd | 107,965 | $1.45M | 0.52% | 00.0% | Unchanged |
| Jane Street Group, LLC | 109,810 | $1.48M | 0.00% | +89,855+450.3% | Added |
| Vanguard Fiduciary Trust Co | 109,961 | $1.48M | 0.00% | +14,833+15.6% | Added |
| TD Asset Management Inc | 111,200 | $1.50M | 0.00% | 00.0% | Unchanged |
| Trium Capital LLP | 113,278 | $1.52M | 0.96% | +113,278 | New |
| ExodusPoint Capital Management, LP | 117,275 | $1.58M | 0.01% | +39,833+51.4% | Added |
| Northern Trust Corp | 119,781 | $1.61M | 0.00% | +21,196+21.5% | Added |
| Anson Funds Management LP | 125,000 | $1.68M | 0.16% | +125,000 | New |
| Norges Bank | 126,575 | $1.70M | 0.00% | +126,575 | New |
| Creek Drive Management Group LLC | 127,600 | $1.72M | 1.06% | +7,600+6.3% | Added |
| DAFNA Capital Management LLC | 128,000 | $1.72M | 0.33% | +128,000 | New |
| Tudor Investment Corp Et Al | 129,591 | $1.74M | 0.01% | +58,232+81.6% | Added |
| Charles Schwab Investment Management Inc | 130,217 | $1.75M | 0.00% | +13,619+11.7% | Added |
| Bank of America Corp | 132,833 | $1.79M | 0.00% | −3,415−2.5% | Reduced |
| Yakira Capital Management, Inc. | 133,047 | $1.79M | 0.53% | +6,402+5.1% | Added |
| Nomura Holdings Inc | 137,394 | $1.85M | 0.01% | +140.0% | Added |
| Bracebridge Capital, LLC | 139,239 | $1.87M | 0.41% | 00.0% | Unchanged |
| Squarepoint Ops LLC | 146,743 | $1.97M | 0.00% | −84,723−36.6% | Reduced |
| Polar Asset Management Partners Inc. | 150,000 | $2.02M | 0.04% | +80,000+114.3% | Added |
| Highland Capital Management Fund Advisors, L.P. | 150,025 | $2.02M | 0.13% | 00.0% | Unchanged |
| AQR Capital Management LLC | 172,235 | $2.32M | 0.00% | +172,235 | New |
| Schonfeld Strategic Advisors LLC | 199,158 | $2.68M | 0.01% | +36,399+22.4% | Added |
| Millennium Management LLC | 200,559 | $2.70M | 0.00% | +9,700+5.1% | Added |
| Weiss Asset Management LP | 219,730 | $2.96M | 0.03% | −20,971−8.7% | Reduced |
| Slotnik Capital, LLC | 237,637 | $3.20M | 0.89% | +56,692+31.3% | Added |
| Cantor Fitzgerald, L. P. | 256,917 | $3.46M | 0.07% | +21,280+9.0% | Added |
| Arbiter Partners Capital Management LLC | 261,288 | $3.51M | 1.88% | +31,288+13.6% | Added |
| State Street Corp | 271,762 | $3.66M | 0.00% | +14,676+5.7% | Added |
| 683 Capital Management, LLC | 300,000 | $4.04M | 0.37% | 00.0% | Unchanged |
| Goldman Sachs Group Inc | 310,341 | $4.17M | 0.00% | −39,609−11.3% | Reduced |
| Two Sigma Investments, LP | 345,481 | $4.65M | 0.00% | +166,921+93.5% | Added |
| Geode Capital Management, LLC | 386,929 | $5.21M | 0.00% | +67,098+21.0% | Added |
| TIG Advisors, LLC | 561,533 | $7.55M | 0.35% | −46,019−7.6% | Reduced |
| CRCM LP | 641,539 | $8.63M | 5.67% | +641,539 | New |
| Vanguard Capital Management LLC | 730,831 | $9.83M | 0.00% | +103,962+16.6% | Added |
| BlackRock, Inc. | 1,447,476 | $19.5M | 0.00% | +242,185+20.1% | Added |
| Price T Rowe Associates Inc | 1,472,984 | $19.8M | 0.00% | −80,226−5.2% | Reduced |
| Sessa Capital IM, L.P. | 1,500,000 | $20.2M | 0.35% | +948,609+172.0% | Added |
| Ra Capital Management, L.P. | 0 | $0 | 0.00% | −864,102−100.0% | Sold out |
| Pentwater Capital Management LP | 0 | $0 | 0.00% | −602,649−100.0% | Sold out |
| O'Connor Alternative Investments LLC | 0 | $0 | 0.00% | −578,011−100.0% | Sold out |
| Farallon Capital Management, L.L.C. | 0 | $0 | 0.00% | −349,360−100.0% | Sold out |
| Bellevue Group AG | 0 | $0 | 0.00% | −263,096−100.0% | Sold out |
| CNH Partners LLC | 0 | $0 | 0.00% | −179,713−100.0% | Sold out |
| Neuberger Berman Group LLC | 0 | $0 | 0.00% | −69,294−100.0% | Sold out |
| Quarry LP | 0 | $0 | 0.00% | −66,651−100.0% | Sold out |
| Westchester Capital Management, LLC | 0 | $0 | 0.00% | −55,236−100.0% | Sold out |
| Highbridge Capital Management LLC | 0 | $0 | 0.00% | −40,986−100.0% | Sold out |
| Fifth Lane Capital, LP | 0 | $0 | 0.00% | −35,999−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −33,691−100.0% | Sold out |
| Woodline Partners LP | 0 | $0 | 0.00% | −28,845−100.0% | Sold out |
| Cannon Global Investment Management, LLC | 0 | $0 | 0.00% | −25,087−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −22,708−100.0% | Sold out |
| Fortress Investment Group LLC | 0 | $0 | 0.00% | −22,033−100.0% | Sold out |
| Grantham, Mayo, Van Otterloo & Co. LLC | 0 | $0 | 0.00% | −15,444−100.0% | Sold out |
| Susquehanna Portfolio Strategies, LLC | 0 | $0 | 0.00% | −13,110−100.0% | Sold out |
| Public Sector Pension Investment Board | 0 | $0 | 0.00% | −12,882−100.0% | Sold out |
| AlphaGrep UK Ltd | 0 | $0 | 0.00% | −11,870−100.0% | Sold out |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −11,343−100.0% | Sold out |
| Magnetar Financial LLC | 0 | $0 | 0.00% | −10,512−100.0% | Sold out |
| Centiva Capital, LP | 0 | $0 | 0.00% | −5,895−100.0% | Sold out |
| Diadema Partners LP | 0 | $0 | 0.00% | −2,512−100.0% | Sold out |
| MAI Capital Management | 0 | $0 | 0.00% | −1,293−100.0% | Sold out |
| Natixis | 0 | $0 | 0.00% | −1,292−100.0% | Sold out |
| Federation des caisses Desjardins du Quebec | 0 | $0 | 0.00% | −810−100.0% | Sold out |
| Public Employees Retirement Association of Colorado | 0 | $0 | 0.00% | −780−100.0% | Sold out |
| Mint Tower Capital Management B.V. | 0 | $0 | 0.00% | −781−100.0% | Sold out |
| Van Eck Associates Corp | 0 | $0 | 0.00% | −472−100.0% | Sold out |
| KBC Group NV | 0 | $0 | 0.00% | −337−100.0% | Sold out |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 0 | $0 | 0.00% | −331−100.0% | Sold out |
| Quadrant Capital Group LLC | 0 | $0 | 0.00% | −316−100.0% | Sold out |
| Persistent Asset Partners Ltd | 0 | $0 | 0.00% | −283−100.0% | Sold out |
| GWM Advisors LLC | 0 | $0 | 0.00% | −123−100.0% | Sold out |
| Westside Investment Management, Inc. | 0 | $0 | 0.00% | −120−100.0% | Sold out |
| Fifth Third Bancorp | 0 | $0 | 0.00% | −59−100.0% | Sold out |
| Assetmark, Inc | 0 | $0 | 0.00% | −34−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −12−100.0% | Sold out |
| Northwestern Mutual Wealth Management Co | 0 | $0 | 0.00% | −4−100.0% | Sold out |
| Massmutual Trust Co FSB | 0 | $0 | 0.00% | −2−100.0% | Sold out |
| Bell Investment Advisors, Inc | 0 | $0 | 0.00% | −2−100.0% | Sold out |
| Root Financial Partners, LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Bare Financial Services, Inc | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Cornerstone Financial Management LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Bessemer Group Inc | 0 | $0 | 0.00% | −9−100.0% | Sold out |