X0306 4 2018-02-02 0 0001679268 MAMMOTH ENERGY SERVICES, INC. TUSK 0001694037 Heerwagen Paul K IV 3001 QUAIL SPRINGS PARKWAY OKLAHOMA CITY OK 73134 1 0 0 0 Common Stock 2018-02-02 4 A 0 2913 0.00 A 2913 D These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing a portion of the annual director grant, pro-rated for the service period beginning on October 20, 2017 and ending on June 8, 2018 and vesting on the earlier of June 8, 2018 and the date of the issuer's 2018 Annual Meeting of Stockholders. 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 2018-02-06