0001209191-23-035128.txt : 20230607 0001209191-23-035128.hdr.sgml : 20230607 20230607165121 ACCESSION NUMBER: 0001209191-23-035128 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20230605 FILED AS OF DATE: 20230607 DATE AS OF CHANGE: 20230607 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Blackman Samuel C. CENTRAL INDEX KEY: 0001863676 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40431 FILM NUMBER: 23999617 MAIL ADDRESS: STREET 1: 395 OYSTER POINT BLVD. STREET 2: SUITE 217 CITY: SOUTH SAN FRANCISCO STATE: CA ZIP: 94080 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Day One Biopharmaceuticals, Inc. CENTRAL INDEX KEY: 0001845337 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 832415215 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 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 4 1 doc4.xml FORM 4 SUBMISSION X0407 4 2023-06-05 0 0001845337 Day One Biopharmaceuticals, Inc. DAWN 0001863676 Blackman Samuel C. 2000 SIERRA POINT PARKWAY, SUITE 501 BRISBANE CA 94005 0 1 0 0 Chief Medical Officer 0 Common Stock 2023-06-05 4 S 0 1229 16.00 D 1234363 D Common Stock 1000000 I By the 2021 Blackman Family LLC The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 23, 2022. The Reporting Person is the sole manager, and has shared voting and dispositive power with his wife as members. The Reporting Person continues to report beneficial ownership of all of the Issuer's Common Stock held by the 2021 Blackman Family LLC but disclaims beneficial ownership except to the extent of his and his wife's pecuniary interest therein. /s/ Charles N. York II, as Attorney-in-Fact 2023-06-07