<SEC-DOCUMENT>0001493152-18-001450-index.html : 20180205
<SEC-HEADER>0001493152-18-001450.hdr.sgml : 20180205
<ACCEPTANCE-DATETIME>20180205091158
ACCESSION NUMBER:		0001493152-18-001450
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20180205
DATE AS OF CHANGE:		20180205

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CATALYST BIOSCIENCES, INC.
		CENTRAL INDEX KEY:			0001124105
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				562020050
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-82442
		FILM NUMBER:		18572922

	BUSINESS ADDRESS:	
		STREET 1:		260 LITTLEFIELD AVENUE
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080
		BUSINESS PHONE:		6507450655

	MAIL ADDRESS:	
		STREET 1:		260 LITTLEFIELD AVENUE
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TARGACEPT INC
		DATE OF NAME CHANGE:	20000919

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			RTW INVESTMENTS, LP
		CENTRAL INDEX KEY:			0001493215
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		250 WEST 55TH STREET
		STREET 2:		16TH FLOOR, SUITE A
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
		BUSINESS PHONE:		646-597-6980

	MAIL ADDRESS:	
		STREET 1:		250 WEST 55TH STREET
		STREET 2:		16TH FLOOR, SUITE A
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RTW INVESTMENTS, LLC
		DATE OF NAME CHANGE:	20100602
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>sc13g.htm
<TEXT>
Document 1 - file: sc13g.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1
<SEQUENCE>2
<FILENAME>ex1.htm
<TEXT>
Document 2 - file: ex1.htm

</DOCUMENT>
</SEC-DOCUMENT>