FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Jepperson Thomas C 		2. Issuer Name and Ticker or Trading Symbol

QUESTAR CORP [ STR ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
VP and General Counsel
(Last)          (First)          (Middle)

180 EAST 100 SOUTH, P.O. BOX 45433 		3. Date of Earliest Transaction (MM/DD/YYYY)

1/19/2010
(Street)

SALT LAKE CITY, UT 84145-0433
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   1/19/2010     S    5000   D $45.0351   80609.247   (1) D    
Common Stock                  12319.3597   (2) I   Employee Investment Plan  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Phantom Stock Units   $0.00                      (3)   (3) Phantom Stock Units   4288.9266     4288.9266   D    
Stock Option   $14.005                    8/13/2001   2/13/2011   Common Stock   10424     10424   D    
Stock Option   $11.475                    8/11/2002   2/11/2012   Common Stock   8612     8612   D    
Stock Option   $13.555                    8/11/2003   2/11/2013   Common Stock   8798     8798   D    
Stock Option   $35.38                      (4) 3/5/2016   Common Stock   30000     30000   D    

Explanation of Responses:
( 1)  These shares sold were sold pursuant to a Rule 10b5-1 plan entered into on 3/6/2009 and disclosed by my Form 144 filed on 1/19/2010 These are the last shares sold in this plan.
( 2)  As of January 19, 2010, I have 12,319.3597 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.
( 3)  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.
( 4)  The option vests in three annual installments beginning on March 5, 2010.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Jepperson Thomas C
180 EAST 100 SOUTH, P.O. BOX 45433
SALT LAKE CITY, UT 84145-0433

VP and General Counsel

Signatures
Abigial L. Jones Attorney in Fact for T. C. Jepperson 1/20/2010
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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