X0202 3/A 2004-05-14 2004-05-19 0 0000891456 PLAINS EXPLORATION & PRODUCTION CO PXP 0001128391 ARNOLD ISAAC JR 601 JEFFERSON SUITE 4010 HOUSTON TX 77002 1 0 0 0 Common Stock 137621 D The direct stock holdings listed in the reporting person's original filing have been increased by 4,747 shares due to an error in the number of shares being used in calculating the conversion of Nuevo Energy Company shares into Plains Exploration & Production Company shares on May 14, 2004. This increase affects the subsequent Forms 4 filed May 20, 2004, June 30, 2004 and September 10, 2004. Deborah R. Anderson, attorney-in-fact for Issac Arnold, Jr. 2004-09-28