Sec Form 4 Filing - GLOBAL UNDERVALUED SECURITIES MASTER FUND LP @ GASTAR EXPLORATION, INC. - 2016-02-22

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person GLOBAL UNDERVALUED SECURITIES MASTER FUND LP 2. Issuer Name and Ticker or Trading Symbol GASTAR EXPLORATION, INC. [ GST] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) X __ Other (specify below) Member of a 13(d) 10% Group (Last) (First) (Middle) 301 COMMERCE STREET, SUITE 1900 3. Date of Earliest Transaction (MM/DD/YY) 02/22/2016 (Street) FORT WORTH, TX76102 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/22/2016 S 50,000 ( 1 ) D $ 0.9861 10,099,519 ( 2 ) ( 3 ) ( 4 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other GLOBAL UNDERVALUED SECURITIES MASTER FUND LP 301 COMMERCE STREET SUITE 1900 FORT WORTH, TX76102 X Member of a 13(d) 10% Group KLEINHEINZ CAPITAL PARTNERS, INC. 301 COMMERCE STREET SUITE 1900 FORT WORTH, TX76102 Member of a 13(d) 10% Group KLEINHEINZ JOHN B 301 COMMERCE STREET SUITE 1900 FORT WORTH, TX76102 Member of a 13(d) 10% Group Signatures See Exhibit 99.1 02/24/2016 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The transaction described in this Form 4 did not result in any short swing profits under Section 16(b) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). ( 2 )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"). ( 3 )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 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 4.) ( 4 )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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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