<SEC-DOCUMENT>0001140361-25-013474-index.html : 20250411
<SEC-HEADER>0001140361-25-013474.hdr.sgml : 20250411
<ACCEPTANCE-DATETIME>20250411160635
ACCESSION NUMBER:		0001140361-25-013474
CONFORMED SUBMISSION TYPE:	ARS
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20241231
FILED AS OF DATE:		20250411
DATE AS OF CHANGE:		20250411
EFFECTIVENESS DATE:		20250411

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Day One Biopharmaceuticals, Inc.
		CENTRAL INDEX KEY:			0001845337
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				832415215
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		ARS
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40431
		FILM NUMBER:		25832116

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>ARS
<SEQUENCE>1
<FILENAME>ny20043087x3_ars.pdf
<DESCRIPTION>ARS
<TEXT>
Document 1 - file: ny20043087x3_ars.pdf

</DOCUMENT>
</SEC-DOCUMENT>