<SEC-DOCUMENT>0001072613-20-000101-index.html : 20200213
<SEC-HEADER>0001072613-20-000101.hdr.sgml : 20200213
<ACCEPTANCE-DATETIME>20200213165347
ACCESSION NUMBER:		0001072613-20-000101
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20200213
DATE AS OF CHANGE:		20200213
GROUP MEMBERS:		ARCH VENTURE FUND IX OVERAGE, L.P.
GROUP MEMBERS:		ARCH VENTURE PARTNERS IX OVERAGE, L.P.
GROUP MEMBERS:		ARCH VENTURE PARTNERS IX, L.P.
GROUP MEMBERS:		ARCH VENTURE PARTNERS IX, LLC
GROUP MEMBERS:		CLINTON BYBEE
GROUP MEMBERS:		KEITH CRANDELL
GROUP MEMBERS:		ROBERT NELSEN

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Gossamer Bio, Inc.
		CENTRAL INDEX KEY:			0001728117
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				475461709
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-91334
		FILM NUMBER:		20611619

	BUSINESS ADDRESS:	
		STREET 1:		3013 SCIENCE PARK
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121
		BUSINESS PHONE:		(858) 922-0718

	MAIL ADDRESS:	
		STREET 1:		3013 SCIENCE PARK
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ARCH Venture Fund IX, L.P.
		CENTRAL INDEX KEY:			0001666306
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		8755 W. HIGGINS ROAD, SUITE 1025
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60631
		BUSINESS PHONE:		773-380-6600

	MAIL ADDRESS:	
		STREET 1:		8755 W. HIGGINS ROAD, SUITE 1025
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60631
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>archix-gossamer_13g18372.htm
<DESCRIPTION>ARCH VENTURE FUND IX, L.P. - GOSSAMER BIO, INC. -- SCHEDULE 13G
<TEXT>
Document 1 - file: archix-gossamer_13g18372.htm

</DOCUMENT>
</SEC-DOCUMENT>