X0201 4 2004-04-20 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 2004-04-20 4 C 0 17224 39.75 A 2296753 I See footnote $2.625 Cumulative Convertible Preferred Stock 39.75 2004-04-20 4 C 0 13694 50 D Common Stock 17224 0 I See footnote $2.625 Cumulative Convertible Preferred Stock 39.75 2004-04-20 4 J 0 821 50 D Common Stock 1032 0 I See footnote Reporting Person elected to convert all the remaining 6,847 shares of $2.625 Cumulative Convertible Preferred Stock ("Preferred Stock") held by him individually and Reporting Person's spouse also elected to convert all remaining 6,847 shares of Preferred stock held by her individually. Reporting Person and his spouse jointly owned 821 shares of Preferred Stock which were not converted and for which $50.467 per share was received by Reporting Person and his spouse upon the automatic redemption date of April 20, 2004. Following the transactions, Reporting Person and his spouse held no further shares of Preferred Stock. The Preferred Stock has no expiry date and is convertible at any time by the holder. Reporting Person holds 1,276,657 shares of common stock directly, Reporting Person's spouse holds 1,018,866 shares of common stock directly, and the Reporting Person and his spouse hold 1,230 shares of common stock as joint tenants. /s/ John C. Walter, as Attorney-in Fact for Walter L. Stonehocker 2004-04-22