X0306 4 2016-01-30 1 0001431372 Gastar Exploration Inc. GST 0001578219 McCown Michael 1331 LAMAR, SUITE 650 HOUSTON TX 77010 0 1 0 0 Senior VP & COO Common Stock 2016-01-30 4 F 0 80494 1.19 D 464685 D Common Stock 2016-01-30 4 M 0 89080 0.00 A 553765 D Common Stock 2016-01-30 4 F 0 31092 1.19 D 522673 D 2013 Performance Based Units 0.00 2016-01-30 4 M 0 44540 0.00 D 2016-01-30 Common Stock 44540 0 D 2014 Performance Based Units 0.00 2016-01-30 4 J 0 14368 0.00 D 2017-01-30 Common Stock 14368 14367 D 2014 Performance Based Units 0.00 2016-02-02 4 J 0 14367 0.00 D 2017-01-30 Common Stock 14367 0 D 2015 Performance Based Units 0.00 2016-02-02 4 J 0 145833 0.00 D 2018-01-30 Common Stock 145833 0 D Shares forfeited to meet tax obligation of restricted share vesting. Common stock acquired as a result of the 2013 performance based unit award vesting at 200% of the target award based on Gastar's share price appreciation over the performance period. Shares forfeited to meet tax obligation of performance based unit vesting. These performance based units ("PBUs") vest ratably over a three-year performance period as previously reported. These PBUs vested and forfeited as a result of the 2014 PBU award settling at 0% of the target award based on Gastar's share price depreciation over the performance period. These PBUs were forfeited in conjunction with reporting person's retirement. These PBUs vest in their entirety at the end of a three-year performance period as previously reported. /s/ Michael McCown, by Michael A. Gerlich as Attorney in Fact 2016-02-02