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Exhibit 22.1

List of Guarantor Subsidiaries

The following subsidiaries of Concho Resources Inc. (the “Company”) were, as of March 31, 2020, guarantors of the Company’s 4.375% Senior Notes due 2025, 3.750% Senior Notes due 2027, 4.300% Senior Notes due 2028, 4.875% Senior Notes due 2047 and 4.850% Senior Notes due 2048:

Exact Name of Guarantor SubsidiaryJurisdiction of Formation
COG Operating LLCDelaware
Mongoose Minerals LLCDelaware
RSP Permian, Inc.Delaware
RSP Permian, L.L.C.Delaware
Concho Oil & Gas LLCTexas
Quail Ranch LLCTexas
COG Realty LLCTexas
COG Holdings LLCTexas
Delaware River SWD LLCTexas
COG Production LLCTexas
COG Acreage LPTexas