X0306 4 2017-02-28 0 0001679268 Mammoth Energy Services, Inc. TUSK 0001450919 Straehla Arty 4727 GAILLARDIA PARKWAY, SUITE 200 OKLAHOMA CITY OK 73142 1 1 0 0 Chief Executive Officer Common Stock 2017-02-28 4 P 0 460 21.7565 A 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. Common Stock 250000 D 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. This amount does not include the aggregate 1,792 shares reported above, which shares are held indirectly by Mr. Straehla as custodian for three UTMA accounts, each in the name of one of Mr. Straehla's grandchildren. /s/ Mark Layton as attorney-in-fact for Arty Straehla 2017-03-02