| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 5.8% | +22% | $37,731,965 | +$6,692,584 | 5,849,917 | +22% | BlackRock, Inc. | 30 Jun 2025 |
| FMR LLC | 5.6% | -43% | $53,284,798 | -$40,829,513 | 5,717,008 | -43% | FMR LLC | 31 Dec 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 102,089,423 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 | 12,862,228 | $119,876,220 | +$20,059,683 | $9.32 | 42 |
| 2025 Q3 | 85,449,652 | $602,397,711 | -$3,593,270 | $7.05 | 169 |
| 2025 Q2 | 86,186,499 | $560,206,343 | -$67,566,969 | $6.50 | 173 |
| 2025 Q1 | 94,058,917 | $745,890,326 | -$40,487,662 | $7.93 | 183 |
| 2024 Q4 | 93,739,342 | $1,187,690,005 | -$3,739,529 | $12.67 | 163 |
| 2024 Q3 | 91,881,053 | $1,281,333,612 | +$237,113,888 | $13.93 | 165 |
| 2024 Q2 | 74,602,379 | $1,028,050,163 | +$21,249,286 | $13.78 | 154 |
| 2024 Q1 | 72,604,915 | $1,199,369,142 | -$58,693,203 | $16.52 | 145 |
| 2023 Q4 | 101,501 | $1,501,883 | +$112,829 | $14.60 | 3 |
| 2023 Q3 | 77,325,767 | $948,787,585 | -$24,319,640 | $12.27 | 124 |
| 2023 Q2 | 78,582,018 | $938,347,210 | +$205,861,747 | $11.94 | 133 |
| 2023 Q1 | 61,082,876 | $816,481,210 | -$9,337,179 | $13.37 | 119 |
| 2022 Q4 | 59,766,818 | $1,286,169,495 | -$37,736,580 | $21.52 | 102 |
| 2022 Q3 | 60,187,503 | $1,205,520,820 | +$22,024,075 | $20.03 | 84 |
| 2022 Q2 | 59,270,087 | $1,060,913,186 | +$302,181,308 | $17.90 | 79 |
| 2022 Q1 | 43,302,285 | $429,552,897 | +$13,142,727 | $9.92 | 65 |
| 2021 Q4 | 41,463,336 | $698,043,000 | +$74,624,254 | $16.85 | 56 |
| 2021 Q3 | 19,043,939 | $450,149,328 | +$33,790,142 | $23.73 | 44 |
| 2021 Q2 | 17,724,839 | $401,085,000 | +$401,084,714 | $22.77 | 32 |