FORM 4
[ X ] 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 *

BARRON HENRY B JR 		2. Issuer Name and Ticker or Trading Symbol

CONSTELLATION ENERGY GROUP INC [ CEG ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Executive Vice President
(Last)          (First)          (Middle)

100 CONSTELLATION WAY 		3. Date of Earliest Transaction (MM/DD/YYYY)

3/12/2012
(Street)

BALTIMORE, MD 21202
(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   3/12/2012     M    7402   (1) A $ 0   30477.35   D    
Common Stock   3/12/2012     F (2)    3343   D $35.86   27134.35   D    
Common Stock   3/12/2012     D    27134.35   D   (3) 0   D    
Common Stock   3/12/2012     D    6862   D   (4) 0   D    
Common Stock   3/12/2012     D    418.7336   D   (3) 0   I   By 401 (k)  

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
Stock options (right to buy)   (5) $90   3/12/2012     D         23120      (6) 4/1/2018   Common Stock   23120     (6) 0   D    
Stock options (right to buy)   (5) $19.76   3/12/2012     D         103670      (7) 2/27/2019   Common Stock   103670     (7) 0   D    
Restricted stock units     (8) 3/12/2012     D         7402      (8)   (8) Common Stock   7402     (8) 0   D    

Explanation of Responses:
( 1)  This transaction involved the vesting of restricted stock units on 3/12/12 in connection with the Merger described below.
( 2)  This amount represents shares withheld to pay taxes due on the restricted stock units that vested on 3/12/12 and is reported in Table II.
( 3)  Disposition of common stock pursuant to Agreement and Plan of Merger (the "Merger") between Exelon Corporation ("Exelon"), Bolt Acquisition Corporation, and Constellation Energy Group, Inc. ("Constellation"), whereby each share of Constellation common stock, without par value, converted into the right to receive 0.9300 shares of Exelon common stock, without par value, having a closing market value of $39.81 per share on the effective date of the Merger and a cash payment being made for any fractional shares.
( 4)  Disposition of stock units pursuant to the Merger, whereby each Constellation stock unit converted into 0.9300 Exelon stock units with a sale restriction that will lapse on 12/26/12 and a cash payment being made for any fractional shares.
( 5)  These are employee stock options.
( 6)  Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $96.78 per share.
( 7)  Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $21.25 per share.
( 8)  Disposition of restricted stock units pursuant to the Merger. The restricted stock units vested and the shares of Constellation common stock received upon vesting converted into the right to receive 0.9300 shares of Exelon common stock, without par value, having a closing market value of $39.81 per share on the effective date of the Merger and a cash payment being made for any fractional shares. The shares of Constellation common stock received upon vesting are included in the number of shares of Constellation common stock disposed of in the Merger reported in Table I.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
BARRON HENRY B JR
100 CONSTELLATION WAY
BALTIMORE, MD 21202

Executive Vice President

Signatures
Sean J. Klein, Attorney-In-Fact 3/14/2012
** 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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