X0201 4 2003-12-01 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 2003-12-01 4 S 0 30000 44.715 D 2444918 I See footnote Common Stock 2003-12-02 4 S 0 5000 45.00 D 2439918 I See footnote Common Stock 2003-12-02 4 S 0 15000 45.15 D 2424918 I See footnote Common Stock 2003-12-03 4 S 0 15000 45.25 D 2409918 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. /s/ John C. Walter, as Attorney-in Fact for Walter L. Stonehocker 2003-12-03