X0201 4 2003-12-24 0 0000751652 QUESTAR CORP STR 0001179477 CASH R D 1 0 0 0 Common Stock and attached Common Stock Purchase Rights 2003-12-24 4 S 0 1600 35.32 D 48537 I Private Foundation Common Stock and attached Common Stock Purchase Rights 2003-12-24 4 S 0 400 35.38 D 48137 I Private Foundation Common Stock and attached Common Stock Purchase Rights 278204 D Phantom Stock Units 0 1988-08-08 1988-08-08 Phantom Stock Units 0 55702.83 D Common Stock and attached Common Stock Purchase Rights 0 1988-08-08 1988-08-08 Common Stock and attached Common Stock Purchase Rights 0 692009 D These shares were sold pursuant to a Rule 10b5-1 plan that was disclosed by my Form 144 filed on 7/21/2003. This total does not include 6,936 shares held indirectly through family trusts for which I have voting and investment control. This total includes 36,557.0852 phantom stock units held in an excess benefits plan. It also includes phantom stock units attributable to deferred director's fees. I am receiving cash payments for the value of phantom stock units (exclusive of deferred director's fees) that began on May 1, 2003. I will not receive cash payments for the value of my deferred director's fees until I retire as a director. Connie C. Holbrook Attorney in Fact for R.D. Cash 2003-12-24