X0202 4/A 2005-12-08 2005-12-13 1 0001109189 BASIC ENERGY SERVICES INC BAS 0001041828 FIRST RESERVE CORP ONE LAFAYETTE PLACE THIRD FLOOR GREENWICH CT 06830 0 0 1 0 0001233494 FIRST RESERVE FUND VIII L P ONE LAFAYETTE PLACE THIRD FLOOR GREENWICH CT 06830 0 0 1 0 0001233493 FIRST RESERVE GP VIII L P ONE LAFAYETTE PLACE THIRD FLOOR GREENWICH CT 06830 0 0 1 0 Common Stock 2005-12-08 4 S 0 194375 20.00 D 2388794 I See FN The sale of the 194,375 shares reported on this Form 4 represent the exercise of an overallotment option by underwriters and was not reflected on the Form 4 filed by the Reporting Persons on December 12, 2005 with respect to the December 8, 2005 transaction. In total, First Reserve Fund VIII, L.P. ("Fund VIII") sold a total of 982,381 shares on December 8, 2005 at the indicated price, following which Fund VIII directly holds 2,388,794 shares of the Issuer's common stock. This Form 4 is being filed on behalf of First Reserve Corporation ("FRC"), First Reserve GP VIII, L.P. ("GP VIII"), and Fund VIII. GP VIII is the general partner of Fund VIII and may be deemed to share beneficial ownership of the shares of Common Stock owned by Fund VIII. FRC, as the general partner of GP VIII, may be deemed to share beneficial ownership of Common Stock owned by Fund VIII. First Reserve Corporation by Anne E. Gold, General Counsel, is signing for itself as the designated filer, as well as in the capacity of general partner of First Reserve GP VIII, L.P. First Reserve GP VIII, L.P. by Anne E. Gold is signing in its capacity as general partner of First Reserve Fund VIII, L.P. /s/ Anne E. Gold 2005-12-13 /s/ Anne E. Gold 2005-12-13 /s/ Anne E. Gold 2005-12-13