X0201 4 2003-12-04 0 0000856716 WESTERN GAS RESOURCES INC WGR 0001228362 STONEHOCKER WALTER L 1099 18TH STREET, SUITE 1200 DENVER CO 80202 1 0 0 0 Common Stock 2003-12-04 4 S 0 50000 45.82 D 2409918 I See footnote Common Stock 2003-12-04 4 S 0 13000 45.85 D 2396918 I See footnote Common Stock 2003-12-05 4 C 0 6862 39.75 A 2403780 I See footnote $2.625 Cumulative Convertible Preferred Stock 39.75 2003-12-05 4 C 0 5457 D Common Stock 6862 26343 I See footnote Reporting Person holds 1,257,791 shares of common stock of Western Gas Resources, Inc. directly and the remainder are held either by the Reporting Person and his spouse as joint tenants or by his spouse. Reporting Person elected to convert 2,500 of the 15,000 shares of the $2.625 Cumulative Convertible Preferred Stock ("Preferred Stock") held by him and his spouse elected to convert 2,500 of the 15,000 shares of Preferred Stock held by her. Reporting Person and his spouse also elected to convert 457 of the 1,800 shares of Preferred Stock jointly owned. Preferred Stock has no expiry date and is convertible at any time at the election of the holder. Reporting Person holds 1,260,935 shares of common stock of Western Gas Resources, Inc. directly and the remainder are held either by the Reporting Person and his spouse as joint tenants or by his spouse. /s/ John C. Walter, as Attorney-in Fact for Walter L. Stonehocker 2003-12-08