0001209191-23-010823.txt : 20230217 0001209191-23-010823.hdr.sgml : 20230217 20230217173515 ACCESSION NUMBER: 0001209191-23-010823 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20230215 FILED AS OF DATE: 20230217 DATE AS OF CHANGE: 20230217 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: York Charles N II CENTRAL INDEX KEY: 0001655962 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40431 FILM NUMBER: 23644232 MAIL ADDRESS: STREET 1: 901 S. MOPAC EXPRESSWAY STREET 2: BARTON OAKS PLAZA ONE, SUITE 250 CITY: AUSTIN STATE: TX ZIP: 78746 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 X0306 4 2023-02-15 0 0001845337 Day One Biopharmaceuticals, Inc. DAWN 0001655962 York Charles N II 2000 SIERRA POINT PARKWAY, SUITE 501 BRISBANE CA 94005 0 1 0 0 COO, CFO and Secretary Common Stock 2023-02-15 4 M 0 1375 A 270185 D Common Stock 2023-02-15 4 M 0 2250 A 272435 D Common Stock 2023-02-16 4 S 0 930 19.573 D 271505 D Restricted Stock Units 2023-02-15 4 M 0 1375 0.00 D Common Stock 1375 15125 D Restricted Stock Units 2023-02-15 4 M 0 2250 0.00 D Common Stock 2250 33750 D Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration. The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs. The RSUs will vest as to 1/16th of the total award in quarterly installments on February 15, May 15, August 15 and November 15, subject to the Reporting Person's provision of service to the Issuer on each vesting date. /s/ Charles N. York II 2023-02-17