X0206 3 2016-01-08 0 0001431372 Gastar Exploration Inc. GST 0001165595 GLOBAL UNDERVALUED SECURITIES MASTER FUND LP 301 COMMERCE STREET, SUITE 1900 FORT WORTH TX 76102 0 0 1 1 Member of a 13(d) 10% Group 0001161175 KLEINHEINZ CAPITAL PARTNERS, INC. 301 COMMERCE STREET, SUITE 1900 FORT WORTH TX 76102 0 0 0 1 Member of a 13(d) 10% Group 0001081865 KLEINHEINZ JOHN B 301 COMMERCE STREET, SUITE 1900 FORT WORTH TX 76102 0 0 0 1 Member of a 13(d) 10% Group Common Stock 8337749 D Represents shares of common stock, par value $0.001 (the "Common Stock"), of Gastar Exploration Inc. (the "Issuer") directly beneficially owned by Global Undervalued Securities Master Fund, L.P. (the "Master Fund"). As general partner of the Master Fund, Kleinheinz Capital Partners, Inc. ("Kleinheinz Inc.") may be deemed to beneficially own the shares of Common Stock directly beneficially owned by the Master Fund. As sole owner of the Master Fund and Kleinheinz Inc., John B. Kleinheinz ("Mr. Kleinheinz") may be deemed to beneficially own the shares of Common Stock directly beneficially owned by the Master Fund. In addition, each reporting person may be deemed to beneficially own more than 10% of the Common Stock under Rule 16a-1(a)(1) under the Securities Exchange Act of 1934, as amended (the "Exchange Act") as a result of being deemed a member of a group under Sections 13(d)(3) and 13(d)(5) of the Exchange Act. (Continued in Footnote 3.) Kleinheinz Inc. and Mr. Kleinheinz disclaim beneficial ownership of all of the Common Stock described herein, except to the extent of any pecuniary interest therein. See Exhibit 99.1 2016-01-13