X0303 4 2010-12-23 0 0000751652 QUESTAR CORP STR 0001180568 RATTIE KEITH O 180 EAST 100 SOUTH, P.O. BOX 45433 SALT LAKE CITY UT 84145-0433 1 0 0 0 Common Stock 2010-12-23 4 M 0 20000 4.515 A 319251 D Common Stock 2010-12-23 4 S 0 20000 17.4384 D 299251 D Common Stock 2010-12-27 4 M 0 20000 4.515 A 319251 D Common Stock 2010-12-27 4 S 0 20000 17.3984 D 299251 D Common Stock 2010-12-28 4 M 0 20000 4.515 A 319251 D Common Stock 2010-12-28 4 S 0 20000 17.381 D 299251 D Common Stock 2646 I IRA Stock Option 4.515 2010-12-23 4 M 0 20000 4.515 D 2001-08-13 2011-02-13 Common Stock 20000 120000 D Stock Option 4.515 2010-12-27 4 M 0 20000 4.515 D 2001-08-13 2011-02-13 Common Stock 20000 100000 D Stock Option 4.515 2010-12-28 4 M 0 20000 4.515 D 2001-08-13 2011-02-13 Common Stock 20000 80000 D Phantom Stock Units 0.00 Phantom Stock Units 27064.6384 27064.6384 D Restricted Stock Unit 0.00 Common Stock 66766.7987 66766.7987 D Stock Option 11.40 2010-06-30 2016-03-05 Common Stock 147174 147174 D Stock Option 13.235 2010-06-30 2015-02-13 Common Stock 80000 80000 D Stock Option 17.35 2010-06-30 2016-02-12 Common Stock 30000 30000 D Stock Option 12.43 2010-06-30 2012-10-24 Common Stock 200000 200000 D Stock Option 13.10 2010-06-30 2017-03-05 Common Stock 125000 125000 D Stock Option 3.695 2002-08-11 2012-02-11 Common Stock 271286 271286 D Stock Option 4.365 2003-08-11 2013-02-11 Common Stock 300000 300000 D My disposition of these shares was pursuant to a 10b5-1 plan. The shares were acquired by the exercise of an option that that would have expired in early 2011. Phantom stock units will be converted to cash per my elections on or within 5 years of my termination of employment (subject to 6-month delay if necessary to comply with IRC 409A), or upon my death or Disability. The restricted stock units vest in three equal annual installments beginning on July 1, 2011, subject to accelerated vesting upon the occurrence of certain events a set forth in the award agreement. Thomas C. Jepperson, Attorney in Fact 2010-12-28