X0202 4 2006-03-13 0 0000751652 QUESTAR CORP STR 0001180568 RATTIE KEITH O 180 EAST 100 SOUTH, P.O. BOX 45433 SALT LAKE CITY UT 84145-0433 0 1 0 0 Pres.& Chief Executive Officer Common Stock and attached Common Stock Purchase Rights 98755 D Common Stock and attached Common Stock Purchase Rights 1208.8938 I Employee Investment Plan Phantom Stock Units 69.15 2006-03-13 4 A 0 1219.6966 69.15 A Phantom Stock Units 1219.6966 14052.8202 D Stock Option 27.42 2001-08-01 2011-02-01 Common Stock and attached Common Stock Purchase Rights 100000 100000 D Stock Option 28.01 2001-08-13 2011-02-13 Common Stock and attached Common Stock Purchase Rights 100000 100000 D Stock Option 22.95 2002-08-11 2012-02-11 Common Stock and attached Common Stock Purchase Rights 140000 140000 D Stock Option 27.11 2003-08-11 2013-02-11 Common Stock and attached Common Stock Purchase Rights 112500 112500 D Stock Option 77.14 2010-02-01 2012-10-24 Common Stock and attached Common Stock Purchase Rights 0 0 D As of March 13, 2006, I have 1,208.8938 equivalent shares of stock in Questar's Employee Investment Plan. The number of equivalent shares will fluctuate as Questar's stock price changes; this fluctuation does not reflect any transactions that should be reported. I also receive phantom stock units as a result of my participation in an excess benefit plan. This total includes 13,963.9524 units in such plan, in addition to units held through my account balance in a deferred compensation plan. I also receive dividends. Phantom stock units will be converted to cash beginning at retirement; my retirement date is unknown. This total includes dividends of .2882 plus shares of 1,219.4084 attributable to my excess benefit plan. Abigail L. Jones Attorney in Fact for K. O. Rattie 2006-03-14