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 *

SULLIVAN MICHAEL D 		2. Issuer Name and Ticker or Trading Symbol

CONSTELLATION ENERGY GROUP INC [ CEG ] 		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)

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     D    9961.933   D   (1) 0   D    

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     (2) 3/12/2012     D         23179.862      (2)   (2) Common Stock   23179.862     (2) 0   D    

Explanation of Responses:
( 1)  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.
( 2)  Each unit of phantom stock (which is in the form of a deferred stock unit) represents the economic equivalent of one share of Constellation common stock, without par value, and settled in cash upon the termination of the reporting person's service on the Board on the effective date of the Merger in an amount based on the average closing price of a share of Constellation's common stock over the most recent 20 days during which Constellation's common stock was traded on the New York Stock Exchange.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
SULLIVAN MICHAEL D
100 CONSTELLATION WAY
BALTIMORE, MD 21202 		X



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.
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