0001950047-24-001093.txt : 20240216 0001950047-24-001093.hdr.sgml : 20240216 20240216175154 ACCESSION NUMBER: 0001950047-24-001093 CONFORMED SUBMISSION TYPE: 144 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20240216 DATE AS OF CHANGE: 20240216 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: Day One Biopharmaceuticals, Inc. CENTRAL INDEX KEY: 0001845337 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] ORGANIZATION NAME: 03 Life Sciences IRS NUMBER: 832415215 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 144 SEC ACT: 1933 Act SEC FILE NUMBER: 001-40431 FILM NUMBER: 24649837 BUSINESS ADDRESS: STREET 1: 2000 SIERRA POINT PARKWAY, SUITE 501 CITY: BRISBANE STATE: CA ZIP: 94005 BUSINESS PHONE: 650 484-0899 MAIL ADDRESS: STREET 1: 2000 SIERRA POINT PARKWAY, SUITE 501 CITY: BRISBANE STATE: CA ZIP: 94005 FORMER COMPANY: FORMER CONFORMED NAME: Day One Biopharmaceuticals Holding Co LLC DATE OF NAME CHANGE: 20210209 REPORTING-OWNER: COMPANY DATA: COMPANY CONFORMED NAME: Bender Jeremy CENTRAL INDEX KEY: 0001863107 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 144 MAIL ADDRESS: STREET 1: 395 OYSTER POINT BLVD. STREET 2: SUITE 217 CITY: SOUTH SAN FRANCISCO STATE: CA ZIP: 94080 144 1 primary_doc.xml 144 0001863107 XXXXXXXX LIVE 0001845337 DAY ONE BIOPHARMACEUTICALS, INC. 001-40431 2000 Sierra Point Parkway, Suite 501 Brisbane CA 94005 (650) 484-0899 JEREMY BENDER Officer Director Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 38th Floor New York NY 10004

7615 116113.52 87042933 02/16/2024 NASDAQ Common 02/15/2024 Restricted Stock Issuer N 7615 02/15/2024 Not Applicable Y 02/16/2024 /s/ Jeremy Bender