X0306 4 2019-01-25 0001679268 MAMMOTH ENERGY SERVICES, INC. TUSK 0001179697 AMRON ARTHUR H C/O WEXFORD CAPITAL LP 411 WEST PUTNAM AVENUE, SUITE 125 GREENWICH CT 06830 true Restricted Stock Units 2019-01-25 4 A 0 1549 0 A 1549 D These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant, pro-rated for the period beginning on January 25, 2019 and ending on June 7, 2019. These securities will vest on the earlier of June 7, 2019 or the date of the issuer's 2019 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 Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein. Arthur H. Amron 2019-01-29