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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1679268	Mammoth Energy Services Inc.	TUSK	Crude Petroleum & Natural Gas (1311)	DE

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
874499	Gulfport Energy Corp	3001 Quail Springs Parkway Oklahoma City OK 73134		Yes	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2018-07-30	118,974	$38.01	9,829,548	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Footnotes

These shares of common stock, par value $0.01 per share ("Common Stock") of Mammoth Energy Services, Inc. (the "Issuer"), were sold by Gulfport Energy Corporation ("Gulfport") to the underwriters in a secondary public offering of Common Stock at a price of $38.01 per share in connection with the underwriters' partial exercise of their option to purchase additional shares of the Issuer's Common Stock from Gulfport and the other selling stockholder granted by such selling stockholders in the previously reported June 2018 secondary offering (the "Option Exercise"). The Option Exercise closed on July 30, 2018.
Of these securities, 4,877 are unvested restricted stock units ("RSUs") that were granted under the Issuer's 2016 Equity Incentive Plan and were assigned to Gulfport by its director designee to the Issuer's board of directors under the terms of his employment with Gulfport. Such director designee previously reported the acquisition of the RSUs in his Form 4 filings and indicated that these were assigned to Gulfport. Of these 4,877 unvested RSUs, 2,222 will vest on October 19, 2018 and 2,655 will vest on the earlier of June 7, 2019 and the date of the Issuer's 2019 Annual Meeting of Stockholders. Each RSU represents a contingent right to receive one share of Common Stock of the Issuer.