144 0001450919 XXXXXXXX LIVE 0001679268 MAMMOTH ENERGY SERVICES, INC. 001-37917 14201 CALIBER DRIVE SUITE 300 OKLAHOMA CITY OK 73134 405-608-6007 Straehla Arty Officer Common Fidelity Brokerage Services LLC

245 Summer Street Boston MA 02110

190000 837900.00 47941652 12/13/2023 NASDAQ Common 02/24/2023 Stock Award Issuer N 110000 02/24/2023 Compensation Common 11/11/2019 Stock Award Issuer N 80000 11/11/2019 Compensation Y 12/13/2023 /s/ Cristina Garcia, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Straehla Arty