Fmr Llc - Sep 30, 2025 SCHEDULE 13G/A Report for DAY ONE BIOPHARMACEUTICALS INC COMMON STOCK (DAWN)

Filing Manager
Fmr Llc
Reporting Manager
FMR LLC
Symbol
DAWN
Shares outstanding
102M shares
Disclosed Ownership
10.1M shares
Ownership
9.9%
Form type
SCHEDULE 13G/A
Date filed
11/5/2025, 11:30 AM
Date of event
Sep 30, 2025
Previous filing
Aug 6, 2025

Reporting Managers (2)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
FMR LLC 9.9% 10.1M 10.1M 0 Stephanie J. Brown Duly authorized under Power of Attorney effective as of January 3, 2023, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Abigail P. Johnson 9.9% 10.1M 0 0 Stephanie J. Brown Duly authorized under Power of Attorney effective as of January 26, 2023, by and on behalf of Abigail P. Johnson**