Notice of Effectiveness
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date: May 16, 2016
Accession Number: 0001564590-16-019396
Submission Type: POS AM
CIK: 0001160308
Company Name: Mast Therapeutics, Inc.
File Number: 333-164177