X0306 4 2017-11-14 0 0001679268 MAMMOTH ENERGY SERVICES, INC. TUSK 0001450919 Straehla Arty 14201 CALIBER DRIVE SUITE 300 OKLAHOMA CITY OK 73134 1 1 0 0 Chief Executive Officer Common Stock 2017-11-14 4 S 0 18289 18.7134 D 231711 D Common Stock 2017-11-15 4 S 0 7553 17.8091 D 224158 D Common Stock 460 I As custodian for grandchild's UTMA Account Common Stock 666 I As custodian for grandchild's UTMA Account Common Stock 666 I As custodian for grandchild's UTMA Account These shares were sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units previously granted under the issuer's equity incentive plan. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $18.50 per share to $19.11 per share, inclusive. The reporting person undertakes to provide to Mammoth Energy Services, Inc., any security holder of Mammoth Energy Services, Inc., 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 ranges set forth in footnotes 2 and 3 of this Form 4. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $17.52 per share to $18.11 per share, inclusive. The shares are held in a custodial account for the benefit of Mr. Straehla's grandchild. Mr. Straehla maintains investment control over the account and may be deemed to have beneficial ownership of these shares. /s/ Mark Layton as attorney-in-fact for Arty Straehla 2017-11-16