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 * 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 (Month/Day/Year) 02/24/2012 (Street) BALTIMORE, MD 21202 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 02/24/2012   A(1)   150,954 A $ 0 559,722.7257 D   Common Stock 02/24/2012   A(2)   71,360 A $ 0 631,082.7257 D   Common Stock 02/25/2012   F(3)   17,028 D $ 36.435 614,332 (4) D   Common Stock               1,798.8813 (5) I By 401 (k) Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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) (6)

$ 36.49

02/24/2012

A

702,700

(7)

02/24/2022

Common Stock

702,700

$ 0

702,700

D

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		02/28/2012
**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).
(1)	Reflects award of stock units that will pay dividends which will be reinvested. These stock units are subject to a sale restriction period ending on 12/26/12.
(2)	Reflects award of service-based restricted stock which will vest on 2/24/13, 2/24/14, and 2/24/15.
(3)	The sale restriction period ending on 2/26/12 has lapsed on the stock units granted on 2/26/10, and shares were withheld to pay the taxes due.
(4)	This amount includes shares obtained through reinvested dividends since the Form 4 filed on 12/29/11.
(5)	This amount includes 11.0388 shares acquired since the Form 4 filed on 12/29/11.
(6)	These are employee stock options.
(7)	Options vest in three equal annual installments on 2/24/13, 2/24/14, and 2/24/15.

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