X0306 4 2017-11-14 0 0001679268 MAMMOTH ENERGY SERVICES, INC. TUSK 0001687210 Layton Mark E. 14201 CALIBER DRIVE SUITE 300 OKLAHOMA CITY OK 73134 0 1 0 0 CFO and Secretary Common Stock 2017-11-14 4 S 0 925 19.0132 D 57075 D 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 $18.75 per share to $19.13 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 range set forth in this footnote. /s/ Mark Layton 2017-11-16