Day One Biopharmaceuticals, Inc.
12.52%
12,929,322
1845337
Apr 8, 2026
Apr 13, 2026, 05:06 PM
Reporting Persons (4)
This is a joint filing. The reported shares may overlap between reporting persons and should not be summed.
| Name | Type | % of Class | Aggregate | Sole Voting | Shared Voting |
|---|---|---|---|---|---|
| AI Day1 LLC | Other | 12.52% | 12,929,322 | 12,929,322 | 0 |
| Access Industries Holdings LLC | Other | 12.52% | 12,929,322 | 0 | 12,929,322 |
| Access Industries Management, LLC | Other | 12.52% | 12,929,322 | 0 | 12,929,322 |
| Len Blavatnik | Individual | 12.52% | 12,929,322 | 0 | 12,929,322 |
Disclosure Items (3)
Common Stock, par value $0.0001 per share
Day One Biopharmaceuticals, Inc.
1800 Sierra Point Parkway, Brisbane, CA, 94005
Item 5 of the Schedule 13D is hereby amended and restated as follows: The responses of each of the Reporting Persons with respect to Rows 11, 12, and 13 of the cover pages of this Schedule 13D that relate to the aggregate number and percentage of Common Stock (including but not limited to footnotes to such information) are incorporated herein by reference. The responses of each of the Reporting Persons with respect to Rows 7, 8, 9, and 10 of the cover pages of this Schedule 13D that relate to the number of Common Stock as to which each of the persons or entities referenced in Item 2 above has sole or shared power to vote or to direct the vote of and sole or shared power to dispose of or to direct the disposition of (including but not limited to footnotes to such information) are incorporated herein by reference.
12,929,322 shares of Common Stock and Warrants to purchase 827,586 shares of Common Stock are owned directly by AI Day1 and may be deemed to be beneficially owned by AIH, AIM and Mr. Blavatnik because (i) AIH indirectly controls all of the outstanding voting interests in AI Day1, (ii) AIM controls AIH and (iii) Mr. Blavatnik controls AIM and controls a majority of the outstanding voting interests in AIH. Each of the Reporting Persons (other than AI Day1), and each of their affiliated entities and the officers, partners, members and managers thereof, disclaims beneficial ownership of these securities.
The following transactions in the Issuer's securities have been effected by Reporting Persons within the 60 days prior to this filing: The information set forth in Item 3 of this Schedule 13D is incorporated by reference herein.
Not applicable.
Not applicable.