Day One Biopharmaceuticals IDAWN
13F holders, Q1 2026 (March 31)208holders +24
77new positions
56sold out
7famous investors
$21.27avg. 13F price*
At the end of Q1 2026, 208 institutions reported holding Day One Biopharmaceuticals I (DAWN) in their 13F filings, up 24 from Q4 2025. 77 opened new positions and 56 sold out. The largest holders were BlackRock, Inc. ($151.0M), Glazer Capital, LLC ($100.4M) and FIL Ltd ($88.6M). 7 famous investors held it, including George Soros (0.6% of Soros Fund Management's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Day One Biopharmaceuticals I
- CUSIP
- 23954D109
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 77 | $613.1M |
| Exits | 56 | $213.7M |
All 13F filers, Q4 2025 → Q1 2026: 40,696,729 shares bought and 40,443,641 shares sold, net +253,088 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 208 holders
| BlackRock, Inc. | 0.00% | Reduce -20.3% | 7,044,487 | $151.0M |
| Glazer Capital, LLC | 2.23% | New | 4,683,687 | $100.4M |
| FIL Ltd | 0.07% | New | 4,131,907 | $88.6M |
| Kryger Capital LLC | 5.91% | — | 3,896,485 | $83.5M |
| Deerfield Management Company, L.P. | 1.11% | No change | 3,723,131 | $79.8M |
| Vanguard Capital Management LLC | 0.00% | — | 3,357,684 | $72.0M |
| JPMorgan Chase & Co. | 0.00% | Add +7101.4% | 3,134,753 | $67.1M |
| State Street Corp. | 0.00% | Reduce -33.1% | 2,869,876 | $61.5M |
| Balyasny Asset Management L.P. | 0.12% | Add +76.2% | 2,625,235 | $56.3M |
| AQR Arbitrage LLC | 1.04% | New | 2,462,154 | $52.8M |
| UBS Group AG | 0.01% | Add +1250.2% | 2,305,123 | $49.4M |
| Vanguard Portfolio Management LLC | 0.00% | — | 2,095,813 | $44.9M |
| Geode Capital Management, LLC | 0.00% | Add +4.1% | 1,954,735 | $41.9M |
| Qube Research & Technologies Ltd | 0.06% | Add +31.5% | 1,954,552 | $41.9M |
| Millennium Management | 0.03% | Add +42.8% | 1,927,557 | $41.3M |
| Bank of America Corp. | 0.00% | Add +75.6% | 1,902,868 | $40.8M |
| O'Connor Alternative Investments LLC | 2.27% | — | 1,867,553 | $40.0M |
| Nuveen, LLC | 0.01% | Add +249.1% | 1,823,998 | $39.1M |
| Perceptive Advisors LLC | 0.75% | New | 1,755,799 | $37.6M |
| Oddo BHF Asset Management Sas | 1.32% | New | 1,550,000 | $33.2M |
| Soros Fund Management | 0.61% | New | 1,539,100 | $33.0M |
| First Trust Capital Management L.P. | 1.69% | New | 1,496,007 | $32.1M |
| Renaissance Technologies | 0.04% | Reduce -0.6% | 1,296,984 | $27.8M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -35.0% | 979,238 | $21.0M |
| DAFNA Capital Management LLC | 4.84% | Reduce -2.1% | 978,463 | $21.0M |
| Water Island Capital LLC | 2.85% | New | 944,247 | $20.2M |
| Alpine Associates Management Inc. | 1.17% | New | 925,000 | $19.8M |
| Dimensional Fund Advisors LP | 0.00% | Reduce -21.0% | 819,371 | $17.6M |
| Pentwater Capital Management LP | 0.12% | New | 800,000 | $17.2M |
| Morgan Stanley | 0.00% | Reduce -55.7% | 687,107 | $14.7M |
| Hudson Bay Capital Management LP | 0.10% | Reduce -60.6% | 670,000 | $14.4M |
| Northern Trust Corp. | 0.00% | Add +8.0% | 666,180 | $14.3M |
| Magnetar Financial LLC | 0.15% | New | 645,173 | $13.8M |
| Healthcare of Ontario Pension Plan Trust Fund | 0.02% | New | 643,738 | $13.8M |
| Polar Asset Management Partners Inc. | 0.44% | New | 630,410 | $13.5M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -2.5% | 617,561 | $13.2M |
| TIG Advisors, LLC | 0.63% | New | 613,918 | $13.2M |
| Janus Henderson Group PLC | 0.01% | Add +2465.4% | 546,428 | $11.7M |
| Alliancebernstein L.P. | 0.00% | Add +1692.0% | 1,214,783 | $11.3M |
| Beryl Capital Management LLC | 10.15% | New | 514,114 | $11.0M |
| Jump Financial, LLC | 0.18% | Reduce -25.4% | 497,365 | $10.7M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 478,839 | $10.3M |
| Jane Street Group, LLC | 0.01% | Reduce -43.8% | 475,436 | $10.2M |
| Susquehanna International Group, LLP | 0.01% | Reduce -35.8% | 473,543 | $10.2M |
| Gabelli Funds LLC | 0.07% | New | 464,097 | $10.0M |
| Cinctive Capital Management LP | 0.63% | New | 450,000 | $9.6M |
| AQR Capital Management | 0.00% | Add +2.9% | 444,467 | $9.5M |
| Kennedy Capital Management LLC | 0.20% | Reduce -19.6% | 436,732 | $9.4M |
| Squarepoint Ops LLC | 0.02% | Add +313.2% | 415,706 | $8.9M |
| Hennion & Walsh Asset Management, Inc. | 0.26% | Add +17.1% | 367,134 | $7.9M |
| LMR Partners LLP | 0.09% | New | 362,641 | $7.8M |
| BNP Paribas Financial Markets | 0.00% | Reduce -25.5% | 337,767 | $7.2M |
| Marshall Wace, LLP | 0.01% | New | 328,638 | $7.0M |
| GABELLI & Co INVESTMENT ADVISERS, INC. | 1.04% | New | 325,350 | $7.0M |
| Capstone Investment Advisors, LLC | 0.06% | New | 236,000 | $5.1M |
| Public Sector Pension Investment Board | 0.02% | New | 236,000 | $5.1M |
| Bank of New York Mellon Corp | 0.00% | Add +9.2% | 231,043 | $5.0M |
| Abc Arbitrage SA | 0.65% | New | 228,817 | $4.9M |
| Alberta Investment Management Corp | 0.03% | New | 200,000 | $4.3M |
| Man Group plc | 0.01% | Add +1.5% | 200,000 | $4.3M |
| Woodline Partners LP | 0.02% | New | 189,057 | $4.1M |
| Eversept Partners, LP | 0.26% | New | 183,902 | $3.9M |
| Groupe la Francaise | 0.05% | New | 179,495 | $3.8M |
| Slotnik Capital, LLC | 1.06% | New | 166,837 | $3.6M |
| Invesco Ltd. | 0.00% | Add +29.0% | 159,898 | $3.4M |
| Skandinaviska Enskilda Banken AB (publ) | 0.07% | New | 150,000 | $3.2M |
| Massachusetts Financial Services Co. | 0.00% | Reduce -2.6% | 147,012 | $3.2M |
| Swiss National Bank | 0.00% | No change | 141,500 | $3.0M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +10.1% | 136,991 | $2.9M |
| Credit Industriel Et Commercial | 0.51% | New | 135,420 | $2.9M |
| Versor Investments LP | 6.49% | New | 123,673 | $2.7M |
| SG Americas Securities, LLC | 0.00% | Reduce -64.9% | 122,922 | $2.6M |
| T. Rowe Price Associates Inc. | 0.00% | Add +16.4% | 119,288 | $2.6M |
| Rhumbline Advisers | 0.00% | Add +6.2% | 118,557 | $2.5M |
| Sagefield Capital LP | 0.17% | New | 110,199 | $2.4M |
| Nomura Asset Management International Inc. | 0.00% | No change | 110,000 | $2.4M |
| Sei Investments Co. | 0.00% | Add +178.8% | 104,598 | $2.2M |
| Maven Securities LTD | 0.13% | New | 103,900 | $2.2M |
| Virtus Investment Advisers, LLC | 0.60% | Add +23.5% | 100,990 | $2.2M |
| Oxford Asset Management LLP | 0.86% | New | 99,747 | $2.1M |
| American Century Companies Inc. | 0.00% | Add +11.8% | 88,278 | $1.9M |
| Gardner Lewis Asset Management L P | 0.39% | New | 84,768 | $1.8M |
| Alps Advisors Inc. | 0.01% | Reduce -0.3% | 84,092 | $1.8M |
| Aquatic Capital Management LLC | 0.05% | Add +1046.7% | 78,379 | $1.7M |
| Harvest Management LLC | 0.86% | New | 75,000 | $1.6M |
| California State Teachers Retirement System | 0.00% | Reduce -6.6% | 67,463 | $1.4M |
| Deutsche Bank AG | 0.00% | Add +16.6% | 66,445 | $1.4M |
| Simplex Trading, LLC | 0.04% | New | 64,464 | $1.4M |
| Mint Tower Capital Management B.V. | 0.28% | New | 60,000 | $1.3M |
| Rafferty Asset Management, LLC | 0.01% | Reduce -62.3% | 59,207 | $1.3M |
| Susquehanna Portfolio Strategies, LLC | 0.02% | No change | 57,379 | $1.2M |
| Prelude Capital Management, LLC | 0.09% | New | 56,673 | $1.2M |
| Wells Fargo & Company | 0.00% | Reduce -50.8% | 56,429 | $1.2M |
| Timothy G. Youngquist 2020 Irrevocable Trust | 0.56% | New | 53,399 | $1.1M |
| Franklin Resources Inc. | 0.00% | Reduce -0.2% | 52,623 | $1.1M |
| Mariner, LLC | 0.00% | Add +67.9% | 52,342 | $1.1M |
| Legal & General Group Plc | 0.00% | Reduce -18.7% | 51,763 | $1.1M |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 50,545 | $1.1M |
| ADAR1 Capital Management, LLC | 0.06% | New | 49,923 | $1.1M |
| MetLife Investment Management, LLC | 0.00% | Add +1.0% | 44,101 | $946K |
"% of holder's portfolio" is DAWN's weight in each manager's 13F, not the share of Day One Biopharmaceuticals I the manager owns.