X0303 4 2010-02-23 0001358071 CONCHO RESOURCES INC CXO 0001370287 Keenan W Howard JR 410 PARK AVENUE 19TH FLOOR NEW YORK NY 10022-4407 1 0 0 0 Common Stock, par value $0.001 per share 2010-02-23 4 A 0 2750 0 A 362989 D Common Stock, par value $0.001 per share 85232 I See footnote Common Stock, par value $0.001 per share 91098 I See footnote Represents a restricted stock grant that vests 12 months from the grant date. Includes 12,750 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. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose. 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. /s/ David W. Copeland, attorney-in-fact 2010-02-26