Mammoth Energy Services Inc.

Priced an underwritten public offering of 4 million shares of its common stock by certain selling stockholders. The gross proceeds from the sale of the shares by the selling stockholders will be approximately $152.8 million. The underwriters have a 30-day option to purchase up to an additional 600,000 shares of common stock from the selling stockholders. Mammoth will not receive any proceeds for the sale of the shares by the selling stockholders.