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Gastar Exploration Inc. – SEPARATION AND RELEASE AGREEMENT (February 27th, 2018)

THIS SEPARATION AND RELEASE AGREEMENT (the “Agreement”) is made as of this 26th day of February, 2018, by Gastar Exploration Inc. (the “Company”), and J. Russell Porter (the “Executive”).

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, President & Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott, Dennard▪Lascar Associates: 713-529-6600 / lelliott@DennardLascar.com (June 27th, 2017)

All Russell US Indexes are subsets of the Russell 3000® Index, which includes the large cap Russell 1000® Index and small cap Russell 2000® Index.  Russell is a source for index data and a default reference for investors all around the world and are widely used by investment managers and institutional investors as benchmarks for both passive and active investment strategies.  The Russell US Indexes are designed as the building blocks of a broad range of financial products, such as index tracking funds, derivatives and Exchange Traded Funds (ETFs), as well as being performance benchmarks.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, President & Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott, Dennard•Lascar Associates: 713-529-6600 / lelliott@DennardLascar.com (June 5th, 2017)

This news release also includes “forward looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward looking statements give our current expectations, opinion, belief or forecasts of future events and performance. A statement identified by the use of forward looking words including “may,” “expects,” “projects,” “anticipates,” “plans,” “believes,” “estimate,” “will,” “should,” and certain of the other foregoing statements may be deemed forward-looking statements. Although Gastar believes that the expectations reflected in such forward-looking statements are reasonable, these statements involve risks and uncertainties that may cause actual future activities and results to be materially different from those suggested or described in this news release. These include risks inherent in oil and natural gas drilling and production activities, including risks with respect to continue

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott, Dennard▪Lascar Associates: 713-529-6600 / lelliott@DennardLascar.com (April 6th, 2017)

HOUSTON, TEXAS, April 6, 2017 — Gastar Exploration Inc., (the “Company”) (NYSE MKT:  GST) today announced that its Net Operating Loss (“NOL”) Shareholder Rights Plan (the “Rights Plan”) has been amended to accelerate the expiration date of the related preferred share purchase rights to April 6, 2017, effectively terminating the Rights Plan as of today. Stockholders are not required to take any action as a result of this expiration.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott, Dennard◾Lascar Associates: 713-529-6600 / lelliott@DennardLascar.com (March 22nd, 2017)

HOUSTON, March 22, 2017 – Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has completed the acquisition of additional working and net revenue interests in approximately 66 gross (9.5 net) producing wells and 5,670 net acres of additional STACK oil and gas leasehold in Kingfisher County, Oklahoma. Prior to the acquisition, Gastar held an interest in the majority of the acquired producing wells and leasehold. Current net production associated with the acquired well interests is approximately 330 barrels of oil equivalent per day (49% oil) and 57% of the acreage is currently held-by-production. The acquisition price of $51.4 million has an effective date of March 1, 2017 and is subject to customary final closing adjustments.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott, Dennard¾Lascar Associates: 713-529-6600 / lelliott@DennardLascar.com (February 17th, 2017)

HOUSTON, February 17, 2017 – Gastar Exploration Inc. (“Gastar” or the “Company”) (NYSE MKT: GST) announced today that it has entered into a definitive securities purchase agreement with funds managed by affiliates of Ares Management, L.P. (NYSE: ARES) (“Ares”) that provides for $425 million in new financing to the Company in the form of a $250 million secured term loan, $125 million secured convertible notes and a $50 million common stock issuance (collectively, the “Ares Investment”). Proceeds from the Ares Investment will be used to fully repay Gastar’s existing $70.4 million revolving credit facility and redeem its $325 million senior secured notes due May 2018. The closing and funding of the Ares Investment, which is expected this month, is subject to the finalization of security and collateral documentation and the satisfaction of customary conditions precedent to funding.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott, Dennard▪Lascar Associates: 713-529-6600 / lelliott@DennardLascar.com (November 21st, 2016)

Gastar also announced that its regularly scheduled November 2016 revolving credit facility borrowing base redetermination resulted in a current borrowing base of $85 million, down from $100 million. Gastar will repay the required $15 million borrowing base reduction from proceeds of the initial closing of the non-core acreage sale. The next regularly scheduled borrowing base redetermination is to occur in May 2017.

Gastar Exploration Inc. – Gastar Exploration Announces Oklahoma Development Agreement in Kingfisher County, Non-Core Canadian County Property Sale and Revolving Credit Facility Amendment (October 20th, 2016)

Under the Development Agreement, the Investor will fund 90% of Gastar’s working interest portion of drilling and completion costs to initially earn 80% of Gastar’s working interest in each new well (in each case, proportionately reduced by other participating working interests in the well).  As a result, Gastar will pay 10% of its working interest portion of such costs for 20% of its original working interest in the well.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.com Anne Pearson / apearson@DennardLascar.com Dennard-Lascar Associates: 713-529-6600 (May 12th, 2016)

This press release does not constitute an offer to sell or the solicitation of an offer to buy the securities described herein, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction. The offering may be made only by means of a prospectus supplement and accompanying base prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.com Anne Pearson / apearson@DennardLascar.com Dennard-Lascar Associates: 713-529-6600 (May 11th, 2016)

This press release does not constitute an offer to sell or the solicitation of an offer to buy the securities described herein, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction.  The offering may be made only by means of a prospectus supplement and accompanying base prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

Gastar Exploration Inc. – NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Andrew Siegel / Nick Lamplough Joele Frank, Wilkinson Brimmer Katcher: 212-355-4449 (January 19th, 2016)

HOUSTON, January 19, 2016 – Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar” or the “Company”) today announced that its Board of Directors has adopted a Net Operating Loss (NOL) Shareholder Rights Agreement (the “Rights Plan”) designed to preserve its substantial tax assets. As of December 31, 2014, Gastar had cumulative net operating loss carryforwards of approximately $447.0 million, which can be utilized in certain circumstances to offset future U.S. taxable income. The Company further expects its cumulative net operating loss carryforwards to increase as of December 31, 2015.

Gastar Exploration Inc. – NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, President and Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott, Dennard▪Lascar Associates 713-529-6600 / lelliott@DennardLascar.com (December 18th, 2015)

HOUSTON, December 16, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar” or the “Company”) today announced the closing of its previously announced acquisition of additional interests in its Area of Mutual Interest (“AMI”) from its AMI co-participant, Husky Ventures, Inc. (“Husky”), and certain other parties (collectively “Sellers”).  The acquisition included working and net revenue interests in 103 gross (10.2 net) producing wells and approximately 15,700 net developed and undeveloped acres in Kingfisher and Garfield Counties, Oklahoma within the STACK play and Hunton Limestone formations.  The purchase price of approximately $42.1 million, with an effective date of July 1, 2015, was funded with borrowings under Gastar’s revolving credit facility. Gastar also conveyed approximately 11,000 net non-core, non-producing acres in Blaine and Major Counties, Oklahoma to the Sellers.  With the closing of the transaction, the AMI participation agreements with Gastar’s AMI co-participant

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, President & CEO 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott, Dennard▪Lascar Associates: 713-529-6600 / lelliott@DennardLascar.com (November 17th, 2015)

HOUSTON, November 16, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar” or the “Company”) is pleased to announce that Mr. Jerry R. Schuyler, a current independent director of Gastar, has been appointed Chairman of Gastar’s Board of Directors, replacing Mr. John M. Selser, Sr. who has resigned from Gastar’s board of directors to devote more time to other business interests.

Gastar Exploration Inc. – NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, President and Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott, Dennard▪Lascar Associates 713-529-6600 / lelliott@DennardLascar.com (October 16th, 2015)

Acquisition from JV partner in area of mutual interest will consolidate Gastar’s Mid-Continent working interests and operations

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts: Gastar Exploration Inc. J. Russell Porter, Chief Executive Officer 713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.com Dennard-Lascar Associates: 713-529-6600 (October 5th, 2015)

HOUSTON, October 5, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for October 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (September 3rd, 2015)

HOUSTON, September 3, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for September 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (August 4th, 2015)

HOUSTON, August 4, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for August 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (July 7th, 2015)

This news release includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934,

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (July 1st, 2015)

HOUSTON, June 30, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) reported today initial and 30-day average production on its second Utica Point/Pleasant well. The Blake U-7H well located in Marshall County, West Virginia produced at a peak 48-hour gross sales rate of 36.8 MMcf/d of natural gas on a 32/64ths choke with approximately 6,235 psi of flowing casing pressure.  On a restricted flow basis, the well’s post peak rate 30-day production averaged 20.2 MMcf/d on a 26/64ths choke with approximately 5,312 psi of flowing casing pressure. The most recent 5-day average rate is 14.8 MMcf/d at approximately 5,008 psi of flowing casing pressure. The Blake U-7H well was drilled with a lateral length of 6,617 feet and was completed with 34 hydraulic fracturing stages that used approximately 14.8 million pounds of proppant.  Gastar has a 50% working interest in the Blake U-7H well and 41.1% net revenue interest in the well.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (July 1st, 2015)

HOUSTON, July 1, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for July 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (June 23rd, 2015)

This news release also includes “forward looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward looking statements give our current expectations, opinion, belief or forecasts of future events and performance. A statement identified by the use of forward looking

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (June 4th, 2015)

HOUSTON, June 4, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for June 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (May 7th, 2015)

HOUSTON, May 5, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for May 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (May 7th, 2015)

HOUSTON, May 6, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has entered into a purchase and sale agreement to sell certain non-core assets in Oklahoma to an undisclosed private third party for approximately $46.2 million, subject to certain adjustments and customary closing conditions. The transaction is expected to close on or before June 22, 2015, with a property sale effective date of April 1, 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (April 2nd, 2015)

HOUSTON, April 2, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for April 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (March 3rd, 2015)

HOUSTON, March 3, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for March 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (February 3rd, 2015)

HOUSTON, February 3, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for February 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (February 3rd, 2015)

HOUSTON, February 2, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) is pleased to provide an investor update that includes a summary of the Company’s year-end 2014 reserves, preliminary fourth quarter 2014 production results, and revised 2015 capital budget and production guidance.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (January 6th, 2015)

HOUSTON, January 5, 2015 - Gastar Exploration Inc. (“Gastar”) (NYSE MKT: GST) is pleased to announce the resolution of a legal challenge to its West Virginia operations and results of recent Marcellus well completions.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (January 6th, 2015)

HOUSTON, January 5, 2015 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for January 2015.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (December 4th, 2014)

HOUSTON, December 4, 2014 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for December 2014.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (November 6th, 2014)

HOUSTON, November 4, 2014 - Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for November 2014.

Gastar Exploration Inc. – NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comAnne Pearson / apearson@DennardLascar .comDennard-Lascar Associates: 713-529-6600 (October 6th, 2014)

HOUSTON, October 3, 2014 – Gastar Exploration Inc. (NYSE MKT: GST) (“Gastar”) announced today that it has declared monthly cash dividends on its 8.625% Series A Preferred Stock (“Series A Preferred Stock”) and its 10.75% Series B Preferred Stock (“Series B Preferred Stock”) for October 2014.

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comAnne Pearson / apearson@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (September 19th, 2014)

HOUSTON, September 18, 2014 – Gastar Exploration Inc. (“Gastar”) (NYSE MKT: GST) announced today that it has priced 17,000,000 shares of its common stock, par value $0.001 per share, at a price to the public of $6.25 per share, in a public offering pursuant to an effective shelf registration statement previously filed with the Securities and Exchange Commission. In connection with the offering, Gastar has granted the underwriters a 30-day option to purchase up to an additional 2,550,000 shares of common stock. Gastar expects to receive net proceeds of approximately $101.2 million (or approximately $116.4 million if the underwriters exercise their option to purchase additional shares), after deducting estimated fees and expenses (including underwriting discounts and commissions).

Gastar Exploration Inc. – For Immediate Release NEWS RELEASE Contacts:Gastar Exploration Inc.J. Russell Porter, Chief Executive Officer713-739-1800 / rporter@gastar.com Investor Relations Counsel: Lisa Elliott / lelliott@DennardLascar.comAnne Pearson / apearson@DennardLascar.comDennard-Lascar Associates: 713-529-6600 (September 15th, 2014)

HOUSTON, September 15, 2014 - Gastar Exploration Inc. (“Gastar”) (NYSE MKT: GST) today announced its 2015 capital budget and provided full-year 2015 production guidance.