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 *
O'Brien Denis P.
   2. Issuer Name and Ticker or Trading Symbol
EXELON CORP [EXC] 		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)
10 SOUTH DEARBORN STREET, 54TH FLOOR		 3. Date of Earliest Transaction (Month/Day/Year)
01/28/2013
(Street)

CHICAGO, IL 60603		 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 01/28/2013   M   22,733 A $ 31.18 33,020 D  
Common Stock 01/28/2013   F   7,539 (1) D $ 31.18 25,481 D  
Common Stock 01/28/2013   D   7,597 (2) D $ 31.18 17,884 D  
Common Stock - ESPP               1,405 D  
Common Stock (Deferred Shares)               7,683 (3) I By Stock Deferral Plan
Common Stock               20,000 I Held by spouse.

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
Performance Shares- Stock Units (4) 01/28/2013   A   47,500     (4)   (4) Common stock 47,500 $ 31.18 54,400 D  
Performance Shares- Stock Units (4) 01/28/2013   M     22,733   (4)   (4) Common stock 22,733 $ 31.18 31,667 D  
Restricted Stock Unit Award 01/28/2013 (5) 01/28/2013   A   24,200     (5)   (5) Common stock 24,200 $ 31.18 24,200 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
O'Brien Denis P.
10 SOUTH DEARBORN STREET
54TH FLOOR
CHICAGO, IL 60603		       Executive Vice President  

Signatures

 Scott N. Peters, Attorney in Fact for Denis P. O'Brien   01/29/2013
**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) Shares withheld by the Issuer for reporting person's tax obligation.
(2) Shares settled in cash on a 1 for 1 basis.
(3) Balance includes 98 shares acquired on 3/9/2012; 28 shares on 4/11/2012; 75 shares on 6/8/2012; 109 shares on 9/10/2012; and 133 shares on 12/10/2012 through automatic dividend reinvestment.
(4) Performance Shares awarded pursuant to the Exelon Long Term Incentive Plan. 1/3 of the shares awarded vest immediately upon receipt. The remaining shares vest in 1/3 increments on each of the first and second anniversaries of the grant date. Under certain circumstances some or all of the vested shares may be settled in cash on a 1 for 1 basis based on the cash value of the underlying stock on the date of vesting.
(5) Restricted stock unit award made pursuant to the Exelon Long Term Incentive Plan. 1/3 of the shares awarded will vest upon the first, second and third anniversary date that is referenced in column 1.

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