Ownership Submission
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

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(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
MOURTON KENNETH R
   2. Issuer Name and Ticker or Trading Symbol
SOUTHWESTERN ENERGY CO [SWN] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
2350 N. SAM HOUSTON PARKWAY EAST, SUITE 300		 3. Date of Earliest Transaction (Month/Day/Year)
12/13/2005
(Street)

HOUSTON, TX 77032		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 12/13/2005   A   770 A $ 0 (1) 6,890 (2) D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(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
Stock Options (Right to buy) $ 1.625             12/31/2000 12/31/2009 Common Stock 48,000   48,000 (3) D  
Stock Options (Right to buy) $ 1.75             12/31/1999 12/31/2008 Common Stock 48,000   48,000 (4) D  
Stock Options (Right to buy) $ 2.4375             12/31/2001 12/31/2010 Common Stock 32,000   32,000 (5) D  
Stock Options (Right to buy) $ 2.725             12/31/2002 12/31/2011 Common Stock 32,000   32,000 (6) D  
Stock Options (Right to buy) $ 2.935             12/31/2003 12/31/2012 Common Stock 32,000   32,000 (7) D  
Stock Options (Right to buy) $ 3.1875             12/31/1998 12/13/2007 Common Stock 48,000   48,000 (8) D  
Stock Options (Right to buy) $ 3.7813             12/31/1997 12/31/2006 Common Stock 48,000   48,000 (9) D  
Stock Options (Right to buy) $ 6.195             12/31/2004 12/31/2013 Common Stock 32,000   32,000 (10) D  
Stock Options (Right to buy) $ 12.45             12/09/2005 12/09/2011 Common Stock 6,880   6,880 (11) D  
Stock Options (Right to buy) $ 35.94 12/13/2005   A   2,750   12/13/2006(12) 12/13/2012 Common Stock 2,750 (1) 2,750 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
MOURTON KENNETH R
2350 N. SAM HOUSTON PARKWAY EAST
SUITE 300
HOUSTON, TX 77032		   X      

Signatures

 Melissa D. McCarty, Attorney-in-Fact   12/13/2005
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(7) This option was previously reported as covering 8,000 shares at an exercise price of $11.74 per share, and has been adjusted as a result of a 2-for-1 stock split on May 20, 2005, and a 2-for-1 stock split on November 3, 2005.
(8) This option was previously reported as covering 12,000 shares at an exercise price of $12.75 per share, and has been adjusted as a result of a 2-for-1 stock split on May 20, 2005, and a 2-for-1 stock split on November 3, 2005.
(6) This option was previously reported as covering 8,000 shares at an exercise price of $10.90 per share, and has been adjusted as a result of a 2-for-1 stock split on May 20, 2005, and a 2-for-1 stock split on November 3, 2005.
(4) This option was previously reported as covering 12,000 shares at an exercise price of $7.00 per share, and has been adjusted as a result of a 2-for-1 stock split on May 20, 2005, and a 2-for-1 stock split on November 3, 2005.
(3) This option was previously reported as covering 12,000 shares at an exercise price of $6.50 per share, and has been adjusted as a result of a 2-for-1 stock split on May 20, 2005, and a 2-for-1 stock split on November 3, 2005.
(5) This option was previously reported as covering 8,000 shares at an exercise price of $9.75 per share, and has been adjusted as a result of a 2-for-1 stock split on May 20, 2005, and a 2-for-1 stock split on November 3, 2005.
(10) This option was previously reported as covering 8,000 shares at an exercise price of $24.78 per share, and has been adjusted as a result of a 2-for-1 stock split on May 20, 2005, and a 2-for-1 stock split on November 3, 2005.
(1) Restricted stock and options granted in consideration of services as a director.
(12) Option becomes exercisable in three equal annual installments beginning on the first anniversary of the grant date specified in Column 3 or immediately upon a change in control.
(9) This option was previously reported as covering 12,000 shares at an exercise price of $15.125 per share, and has been adjusted as a result of a 2-for-1 stock split on May 20, 2005, and a 2-for-1 stock split on November 3, 2005.
(2) On May 20, 2005, and again on November 3, 2005, the common stock of Southwestern Energy Company split 2-for-1, resulting in the reporting person's acquisition of 4,590 additional shares of common stock.
(11) This option was previously reported as covering 1,720 shares at an exercise price of $49.80 per share, and has been adjusted as a result of a 2-for-1 stock split on May 20, 2005, and a 2-for-1 stock split on November 3, 2005.

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