| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | 9.9% | -12% | $71,188,562 | -$8,777,469 | 10,097,668 | -11% | FMR LLC | 30 Sep 2025 |
| BlackRock, Inc. | 5.8% | +22% | $38,061,315 | +$6,751,002 | 5,849,917 | +22% | BlackRock, Inc. | 30 Jun 2025 |
As of 30 Sep 2025, 169 institutional investors reported holding 85,449,652 shares of Day One Biopharmaceuticals, Inc. - COMMON STOCK (DAWN). This represents 84% of the company’s total 101,996,650 outstanding shares.
The largest institutional shareholders of Day One Biopharmaceuticals, Inc. - COMMON STOCK (DAWN) together control 71% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| FMR LLC | 9.9% | 10,097,668 | -11% | 0% | $71,188,561 |
| BlackRock, Inc. | 8.8% | 9,001,455 | -8.4% | 0% | $63,460,258 |
| Atlas Venture Life Science Advisors, LLC | 6.3% | 6,430,257 | 0% | 6% | $45,333,312 |
| VANGUARD GROUP INC | 6.1% | 6,181,329 | +0.08% | 0% | $43,578,369 |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 4.6% | 4,705,413 | +26% | 0.51% | $33,173,162 |
| FRANKLIN RESOURCES INC | 3.4% | 3,477,026 | -15% | 0.01% | $24,513,031 |
| Rubric Capital Management LP | 3.3% | 3,377,071 | 0.32% | $23,808,351 | |
| STATE STREET CORP | 3.2% | 3,240,444 | +20% | 0% | $22,845,130 |
| Vestal Point Capital, LP | 2.6% | 2,675,000 | -11% | 0.86% | $18,858,750 |
| Pictet Asset Management Holding SA | 2.3% | 2,373,133 | -36% | 0.02% | $16,730,588 |
| Alyeska Investment Group, L.P. | 2.2% | 2,212,187 | -27% | 0.05% | $15,595,918 |
| BRAIDWELL LP | 2.1% | 2,181,598 | 0% | 0.46% | $15,380,266 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.7% | 1,761,264 | +2.9% | 0% | $12,418,743 |
| AIGH Capital Management LLC | 1.5% | 1,520,492 | 3.8% | $10,719,469 | |
| MAK CAPITAL ONE LLC | 1.4% | 1,448,461 | 2% | $10,211,650 | |
| Balyasny Asset Management L.P. | 1.4% | 1,384,047 | 0.02% | $9,757,531 | |
| GOLDMAN SACHS GROUP INC | 1.3% | 1,371,437 | -19% | 0% | $9,668,631 |
| Hudson Bay Capital Management LP | 1.3% | 1,320,000 | +1.8% | 0.06% | $9,306,000 |
| ALGERT GLOBAL LLC | 1.3% | 1,317,042 | +45% | 0.16% | $9,285,000 |
| MORGAN STANLEY | 1.3% | 1,304,029 | -3.6% | 0% | $9,193,406 |
| DIMENSIONAL FUND ADVISORS LP | 1.2% | 1,223,284 | -14% | 0% | $8,623,775 |
| BANK OF AMERICA CORP /DE/ | 1.2% | 1,191,851 | +23% | 0% | $8,402,550 |
| Qube Research & Technologies Ltd | 1.1% | 1,167,669 | +24% | 0.01% | $8,232,066 |
| DAFNA Capital Management LLC | 0.98% | 999,163 | +14% | 1.7% | $7,044,099 |
| RENAISSANCE TECHNOLOGIES LLC | 0.89% | 905,476 | -9.5% | 0.01% | $6,383,606 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 664,280 | $6,191,233 | +$5,053,624 | $9.32 | 5 |
| 2025 Q3 | 85,449,652 | $602,397,710 | -$3,593,242 | $7.05 | 169 |
| 2025 Q2 | 86,186,499 | $560,206,343 | -$67,566,968 | $6.50 | 173 |
| 2025 Q1 | 94,058,917 | $745,890,533 | -$40,487,714 | $7.93 | 183 |
| 2024 Q4 | 93,739,417 | $1,187,690,667 | -$5,879,821 | $12.67 | 163 |
| 2024 Q3 | 92,050,053 | $1,283,687,781 | +$239,491,695 | $13.93 | 165 |
| 2024 Q2 | 74,705,046 | $1,029,464,955 | +$17,373,333 | $13.78 | 155 |
| 2024 Q1 | 72,782,347 | $1,202,300,406 | -$58,498,635 | $16.52 | 147 |
| 2023 Q4 | 76,570,666 | $1,117,957,204 | -$50,224,829 | $14.60 | 138 |
| 2023 Q3 | 77,547,732 | $951,517,363 | -$22,223,998 | $12.27 | 127 |
| 2023 Q2 | 78,803,713 | $941,011,552 | +$208,122,003 | $11.94 | 136 |
| 2023 Q1 | 61,209,087 | $818,137,120 | -$10,189,943 | $13.37 | 122 |
| 2022 Q4 | 59,797,551 | $1,286,831,022 | -$37,719,296 | $21.52 | 105 |
| 2022 Q3 | 60,343,678 | $1,208,648,617 | +$24,007,409 | $20.03 | 87 |
| 2022 Q2 | 59,307,013 | $1,061,573,186 | +$302,547,160 | $17.90 | 80 |
| 2022 Q1 | 43,302,427 | $429,553,897 | +$13,144,675 | $9.92 | 66 |
| 2021 Q4 | 41,477,196 | $698,277,000 | +$74,959,681 | $16.85 | 57 |
| 2021 Q3 | 19,043,827 | $450,147,328 | +$32,649,130 | $23.73 | 43 |
| 2021 Q2 | 17,724,839 | $401,085,000 | +$401,084,962 | $22.77 | 32 |