<SEC-DOCUMENT>0001193125-25-070393-index.html : 20250401
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<ACCEPTANCE-DATETIME>20250401160200
ACCESSION NUMBER:		0001193125-25-070393
CONFORMED SUBMISSION TYPE:	S-3
PUBLIC DOCUMENT COUNT:		10
FILED AS OF DATE:		20250401
DATE AS OF CHANGE:		20250401

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Boundless Bio, Inc.
		CENTRAL INDEX KEY:			0001782303
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				830751369
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-286302
		FILM NUMBER:		25799528

	BUSINESS ADDRESS:	
		STREET 1:		10955 ALEXANDRIA WAY
		STREET 2:		SUITE 100
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121
		BUSINESS PHONE:		(858) 766-9912

	MAIL ADDRESS:	
		STREET 1:		10955 ALEXANDRIA WAY
		STREET 2:		SUITE 100
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121
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<TYPE>S-3
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<FILENAME>d926309ds3.htm
<DESCRIPTION>S-3
<TEXT>
Document 1 - file: d926309ds3.htm

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<DOCUMENT>
<TYPE>EX-1.2
<SEQUENCE>2
<FILENAME>d926309dex12.htm
<DESCRIPTION>EX-1.2
<TEXT>
Document 2 - file: d926309dex12.htm

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<DOCUMENT>
<TYPE>EX-4.3
<SEQUENCE>3
<FILENAME>d926309dex43.htm
<DESCRIPTION>EX-4.3
<TEXT>
Document 3 - file: d926309dex43.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>4
<FILENAME>d926309dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 4 - file: d926309dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.2
<SEQUENCE>5
<FILENAME>d926309dex52.htm
<DESCRIPTION>EX-5.2
<TEXT>
Document 5 - file: d926309dex52.htm

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<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>6
<FILENAME>d926309dex231.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 6 - file: d926309dex231.htm

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<DOCUMENT>
<TYPE>EX-FILING FEES
<SEQUENCE>7
<FILENAME>d926309dexfilingfees.htm
<DESCRIPTION>EX-FILING FEES
<TEXT>
Document 7 - file: d926309dexfilingfees.htm

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g926309g0327131011671.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g926309g0327131011671.jpg

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<FILENAME>g926309g0327160637493.jpg
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Document 9 - file: g926309g0327160637493.jpg

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Document 10 - file: g926309g03h01.jpg

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