Exhibit 17.1

May 8, 2020

To the Board of Directors of

Mammoth Energy Services, Inc.

14201 Caliber Drive, Suite 300

Oklahoma City, OK 73134

Effective immediately, I hereby resign as a member of the Board of Directors of Mammoth Energy Services, Inc.

/s/ Jonathan H. Yellen    

Jonathan H. Yellen

Cc: Mark Layton, Secretary (Mammoth)

        Matthew Thompson, Senior Counsel (Mammoth)

        Tom Knight (Grant Thornton)

        Seth Molay (Akin Gump)

        Patrick K. Craine (Gulfport)