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
                                                                                  
OMB APPROVAL
OMB Number: 3235-0287
Expires: November 30, 2011
Estimated average burden
hours per response... 0.5
                      
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 *

SHATTUCK MAYO A III 		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
__ X __ Officer (give title below)      _____ Other (specify below)
Chairman, Pres. & CEO
(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    150954   D   (1) 0   D    
Common Stock   3/12/2012     D    463378   D   (2) 0   D    
Common Stock   3/12/2012     D    1798.8813   D   (2) 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)   (3) $39.63   3/12/2012     D         184773      (4) 2/26/2014   Common Stock   184773     (4) 0   D    
Stock options (right to buy)   (3) $50.96   3/12/2012     D         334210      (5) 2/24/2015   Common Stock   334210     (5) 0   D    
Stock options (right to buy)   (3) $58.33   3/12/2012     D         75874      (6) 12/21/2015   Common Stock   75874     (6) 0   D    
Stock options (right to buy)   (3) $75.85   3/12/2012     D         293040      (7) 2/22/2017   Common Stock   293040     (7) 0   D    
Stock options (right to buy)   (3) $93.97   3/12/2012     D         226550      (8) 2/21/2018   Common Stock   226550     (8) 0   D    
Stock options (right to buy)   (3) $19.76   3/12/2012     D         781250      (9) 2/27/2019   Common Stock   781250     (9) 0   D    
Stock options (right to buy)   (3) $35.07   3/12/2012     D         407890      (10) 2/26/2020   Common Stock   407890     (10) 0   D    
Stock options (right to buy)   (3) $30.18   3/12/2012     D         500960      (11) 2/25/2021   Common Stock   500960     (11) 0   D    
Stock options (right to buy)   (3) $36.49   3/12/2012     D         702700      (12) 2/24/2022   Common Stock   702700     (12) 0   D    

Explanation of Responses:
( 1)  Disposition of stock units pursuant to Agreement and Plan of Merger (the "Merger") between Exelon Corporation ("Exelon"), Bolt Acquisition Corporation, and Constellation Energy Group, Inc. ("Constellation"), 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.
( 2)  Disposition of common stock pursuant to the Merger, 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.
( 3)  These are employee stock options.
( 4)  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 $42.62 per share.
( 5)  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 $54.80 per share.
( 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 $62.73 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 $81.56 per share.
( 8)  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 $101.05 per share.
( 9)  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.
( 10)  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 $37.71 per share.
( 11)  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 $32.46 per share.
( 12)  Pursuant to the Merger, each Constellation stock option converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $39.24 per share. These stock options were granted on 2/24/12 and will vest on 2/24/13, 2/24/14, and 2/24/15.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
SHATTUCK MAYO A III
100 CONSTELLATION WAY
BALTIMORE, MD 21202 		X
Chairman, Pres. & CEO

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.
Constellation Energy (NYSE:CEG)
Historical Stock Chart
From May 2024 to Jun 2024 Click Here for more Constellation Energy Charts.
Constellation Energy (NYSE:CEG)
Historical Stock Chart
From Jun 2023 to Jun 2024 Click Here for more Constellation Energy Charts.