Exhibit 99.3 - Joint Filers’ Signatures

WARBURG PINCUS PRIVATE EQUITY X O&G, L.P.

By: Warburg Pincus X, L.P., its General Partner

By: Warburg Pincus X GP L.P., its General Partner

By: WPP GP LLC, its General Partner

By: Warburg Pincus Partners, L.P., its Managing Member

By: Warburg Pincus Partners GP LLC, its General Partner

By: Warburg Pincus & Co., its Managing Member

WARBURG PINCUS X PARTNERS, L.P.

By: Warburg Pincus X, L.P., its General Partner

By: Warburg Pincus X GP L.P., its General Partner

By: WPP GP LLC, its General Partner

By: Warburg Pincus Partners, L.P., its Managing Member

By: Warburg Pincus Partners GP LLC, its General Partner

By: Warburg Pincus & Co., its Managing Member

WARBURG PINCUS X, L.P.

By: Warburg Pincus X GP L.P., its General Partner

By: WPP GP LLC, its General Partner

By: Warburg Pincus Partners, L.P., its Managing Member

By: Warburg Pincus Partners GP LLC, its General Partner

By: Warburg Pincus & Co., its Managing Member

WARBURG PINCUS X GP L.P.

By: WPP GP LLC, its General Partner

By: Warburg Pincus Partners, L.P., its Managing Member

By: Warburg Pincus Partners GP LLC, its General Partner

By: Warburg Pincus & Co., its Managing Member

WPP GP LLC

By: Warburg Pincus Partners, L.P., its Managing Member

By: Warburg Pincus Partners GP LLC, its General Partner

By: Warburg Pincus & Co., its Managing Member

WARBURG PINCUS PARTNERS, L.P.

By: Warburg Pincus Partners GP LLC, its General Partner

By: Warburg Pincus & Co., its Managing Member

WARBURG PINCUS PARTNERS GP LLC

By: Warburg Pincus & Co., its Managing Member

WARBURG PINCUS & CO.

WARBURG PINCUS LLC

Warburg Pincus Private Equity X O&G, L.P. 4