Exhibit 99

Form 4 Joint Filer Information

Name:	YORKTOWN ENERGY PARTNERS VI, L.P.
Address:	410 PARK AVENUE, 19TH FLOOR
	NEW YORK, NY 10022-4407
Designated Filer:	YORKTOWN VI ASSOCIATES LLC
Issuer & Ticket Symbol:	CONCHO RESOURCES INC. [CXO]
Date of Event Requiring Statement:	08/11/2009

Signature:	YORKTOWN ENERGY PARTNERS VI, L.P.
	By:	Yorktown VI Company LP, its general partner
	By:	Yorktown VI Associates LLC, its general partner
	By:	/s/ W. Howard Keenan, Jr.
		Member
Date:	08/12/2009