X0304 4 2012-02-21 false 0001358071 CONCHO RESOURCES INC CXO 0001370287 Keenan W Howard JR 410 PARK AVENUE, 19TH FLOOR NEW YORK NY 10022 true false false false Common Stock 85232 I See footnote Common Stock 91098 I See footnote Common Stock 2012-02-21 4 A false 1520 0 A 383401 D These securities are owned directly by Yorktown Energy Partners V, L.P., of which Yorktown V Company LLC is the general partner. The reporting person is a member and manager of Yorktown V Company LLC. These securities are owned directly by Yorktown Energy Partners VI, L.P., of which Yorktown VI Company LP is the general partner, of which Yorktown VI Associates LLC is the general partner. The reporting person is a member and manager of Yorktown VI Associates LLC. Represents a restricted stock grant that vests in a single installment on February 21, 2013. The direct ownership amount includes 10,000 shares received by the reporting person as director compensation that the reporting person holds for the benefit of Yorktown Energy Partners V, L.P. and Yorktown Energy Partners VI, L.P., and of which the reporting person disclaims any beneficial ownership for, except to the extent of his pecuniary interest therein. /s/ W. Howard Keenan, Jr. 2012-02-23