<SEC-DOCUMENT>0001193125-20-213690-index.html : 20200826
<SEC-HEADER>0001193125-20-213690.hdr.sgml : 20200826
<ACCEPTANCE-DATETIME>20200807203431
ACCESSION NUMBER:		0001193125-20-213690
CONFORMED SUBMISSION TYPE:	SC 13D
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20200807
DATE AS OF CHANGE:		20200807
GROUP MEMBERS:		BLACKSTONE CLARUS III L.L.C.
GROUP MEMBERS:		BLACKSTONE GROUP INC.
GROUP MEMBERS:		BLACKSTONE GROUP MANAGEMENT L.L.C.
GROUP MEMBERS:		BLACKSTONE HOLDINGS I/II GP L.L.C.
GROUP MEMBERS:		CLARUS LIFESCIENCES III, L.P.
GROUP MEMBERS:		CLARUS VENTURES III GP, L.P.
GROUP MEMBERS:		STEPHEN A. SCHWARZMAN

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Annexon, Inc.
		CENTRAL INDEX KEY:			0001528115
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				275414423
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-91583
		FILM NUMBER:		201086540

	BUSINESS ADDRESS:	
		STREET 1:		180 KIMBALL WAY
		STREET 2:		SUITE 200
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080
		BUSINESS PHONE:		(650)-822-5500

	MAIL ADDRESS:	
		STREET 1:		180 KIMBALL WAY
		STREET 2:		SUITE 200
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Blackstone Holdings II L.P.
		CENTRAL INDEX KEY:			0001484870
		IRS NUMBER:				260288604

	FILING VALUES:
		FORM TYPE:		SC 13D

	BUSINESS ADDRESS:	
		STREET 1:		C/O  THE BLACKSTONE GROUP
		STREET 2:		345 PARK AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10154
		BUSINESS PHONE:		212-583-5000

	MAIL ADDRESS:	
		STREET 1:		C/O  THE BLACKSTONE GROUP
		STREET 2:		345 PARK AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10154
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D
<SEQUENCE>1
<FILENAME>d90191dsc13d.htm
<DESCRIPTION>SC 13D
<TEXT>
Document 1 - file: d90191dsc13d.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.A
<SEQUENCE>2
<FILENAME>d90191dex99a.htm
<DESCRIPTION>EXHIBIT A
<TEXT>
Document 2 - file: d90191dex99a.htm

</DOCUMENT>
</SEC-DOCUMENT>