X0201 4/A 2003-07-07 2003-09-11 0 0000891456 PLAINS EXPLORATION & PRODUCTION CO PXP 0001083297 ENCAP INVESTMENTS LLC 1100 LOUISIANA SUITE 3150 HOUSTON TX 77002 0 0 1 0 Common Stock 2003-07-07 4 J 0 578 10.81 A 4270752 I by affiliates In the reporting person's Form 4 dated September 11, 2003, the reporting person inadvertently overstated these shares by 9 shares. Such shares were also inadvertently overstated by 9 shares in subsequent Form 4s filed by the reporting person on October 3, 2003, November 6, 2003, and January 5, 2004. Represents shares granted to EnCap Energy Capital Fund III, L.P. as compensation for Robert L. Zorich serving on the Issuer's board of directors. Represents 2,143,114 shares held by EnCap Energy Capital Fund III, L.P., 1,604,946 shares held by EnCap Energy Capital Fund III-B, L.P., and 522,692 shares held by BOCP Energy Partners, L.P. by: EnCap Investments L.P., Manager of EnCap Investments L.L.C., by EnCap Investments GP, L.L.C., General Partner of EnCap Investments L.P., by /s/ Robert L. Zorich, Senior Managing Director 2004-03-11