X0306 4 2016-06-20 0 0000874499 GULFPORT ENERGY CORP GPOR 0001583383 Maier Stuart 14313 NORTH MAY AVENUE, SUITE 100 OKLAHOMA CITY OK 73134 0 1 0 0 Vice President of Geosciences Common Stock 2016-06-20 4 S 0 10000 33.3546 D 20366 D This transaction was executed in multiple trades at prices ranging from $33.35 per share to $33.36 per share, inclusive. The price reported above reflects the weighted average sale price. The reporting person undertakes to provide Gulfport Energy Corporation, any security holder of Gulfport Energy Corporation or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. /s/ Stuart A. Maier 2016-06-22