X0306 4 2018-02-02 0 0001679268 MAMMOTH ENERGY SERVICES, INC. TUSK 0001034323 SMITH ARTHUR L 14201 CALIBER DRIVE SUITE 300 OKLAHOMA CITY OK 73134 1 0 0 0 Common Stock 2018-02-02 4 A 0 2913 0.00 A 9580 D Common Stock 6000 I By Arthur L. Smith Family LP 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 shares of common stock are held by Arthur L. Smith Family LP, which is managed by Arthur L. Smith Management LLC, of which Mr. Smith is the manager. /s/ Mark Layton as attorney-in-fact for Arthur Smith 2018-02-06