X0202 4 2007-08-02 0 0001358071 CONCHO RESOURCES INC CXO 0001408628 CHASE OIL CORP P.O. BOX 1767 ARTESIA NM 88211-1767 0 0 1 0 Common Stock 2007-08-02 4 S 0 5382988 10.7812 D 22621995 D These shares were sold in the initial public offering of Concho Resources Inc. ("Concho") pursuant to an Underwriting Agreement dated August 2, 2007 among Concho, the Reporting Person, the other selling stockholders named therein, and J.P. Morgan Securities Inc. and Banc of America Securities LLC, as representatives of the several underwriters named therein. /s/ Robert C. Chase 2007-08-06