X0306 4 2017-01-09 0 0001679268 Mammoth Energy Services, Inc. TUSK 0001694037 Heerwagen Paul K IV 3001 QUAIL SPRINGS PKWY. OKLAHOMA CITY OK 73134 1 0 0 0 Common Stock 2016-01-09 4 A 0 4444 0.00 A 4444 D These securities are restricted stock units that were granted under the issuer's 2016 Equity Incentive Plan. These restricted stock units will vest in two equal annual installments beginning on October 19, 2017. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Gulfport Energy Corporation under the terms of Mr. Heerwagen's employment with Gulfport Energy Corporation. As a result, Mr. Heerwagen disclaims any pecuniary interest in these restricted stock units. /s/ Mark Layton as attorney-in-fact for Paul K. Heerwagen IV 2017-01-10