<SEC-DOCUMENT>0001535610-16-000140-index.html : 20160212
<SEC-HEADER>0001535610-16-000140.hdr.sgml : 20160212
<ACCEPTANCE-DATETIME>20160212131843
ACCESSION NUMBER:		0001535610-16-000140
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20160212
DATE AS OF CHANGE:		20160212

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Mast Therapeutics, Inc.
		CENTRAL INDEX KEY:			0001160308
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				841318182
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-78541
		FILM NUMBER:		161417254

	BUSINESS ADDRESS:	
		STREET 1:		3611 VALLEY CENTRE DRIVE
		STREET 2:		SUITE 500
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92130
		BUSINESS PHONE:		8585520866

	MAIL ADDRESS:	
		STREET 1:		3611 VALLEY CENTRE DRIVE
		STREET 2:		SUITE 500
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92130

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ADVENTRX PHARMACEUTICALS INC
		DATE OF NAME CHANGE:	20030613

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BIOKEYS PHARMACEUTICALS INC
		DATE OF NAME CHANGE:	20010928

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SABBY MANAGEMENT, LLC
		CENTRAL INDEX KEY:			0001535610
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		10 MOUNTAINVIEW ROAD
		STREET 2:		SUITE 205
		CITY:			UPPER SADDLE RIVER
		STATE:			NJ
		ZIP:			07458
		BUSINESS PHONE:		646-307-4527

	MAIL ADDRESS:	
		STREET 1:		10 MOUNTAINVIEW ROAD
		STREET 2:		SUITE 205
		CITY:			UPPER SADDLE RIVER
		STATE:			NJ
		ZIP:			07458
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>mstx0216.txt
<DESCRIPTION>SABBY 13G MSTX 2.12.16
<TEXT>
Document 1 - file: mstx0216.txt

</DOCUMENT>
</SEC-DOCUMENT>