<SEC-DOCUMENT>0000315066-22-001748-index.html : 20220912
<SEC-HEADER>0000315066-22-001748.hdr.sgml : 20220912
<ACCEPTANCE-DATETIME>20220912111314
ACCESSION NUMBER:		0000315066-22-001748
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20220912
DATE AS OF CHANGE:		20220912

SUBJECT COMPANY:	

	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

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-92582
		FILM NUMBER:		221237940

	BUSINESS ADDRESS:	
		STREET 1:		395 OYSTER POINT BLVD STE 217
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080-1930
		BUSINESS PHONE:		206-913-4300

	MAIL ADDRESS:	
		STREET 1:		395 OYSTER POINT BLVD STE 217
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080-1930

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Day One Biopharmaceuticals Holding Co LLC
		DATE OF NAME CHANGE:	20210209

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FMR LLC
		CENTRAL INDEX KEY:			0000315066
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				043532603
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		245 SUMMER STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		6175706339

	MAIL ADDRESS:	
		STREET 1:		245 SUMMER STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FMR CORP
		DATE OF NAME CHANGE:	19920717
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>filing.txt
<TEXT>
Document 1 - file: filing.txt

</DOCUMENT>
</SEC-DOCUMENT>