Sec Form 4 Filing - GLACE JOSEPH R @ EXELON CORP - 2013-01-28

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 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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1. Name and Address of Reporting Person GLACE JOSEPH R 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) SVP and Chief Risk Officer (Last) (First) (Middle) 10 SOUTH DEARBORN STREET, 54TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 01/28/2013 (Street) CHICAGO, IL60603 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 3,722 A $ 31.18 7,199 D Common Stock 01/28/2013 F 1,570 ( 1 ) D $ 31.18 5,629 D Common Stock 01/28/2013 D 980 ( 2 ) D $ 31.18 4,649 D Common Stock - ESPP 1,361 ( 3 ) D Common Stock - IRA account 200 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 7,375 ( 4 ) ( 4 ) Common stock 7,375 $ 31.18 8,022 D Performance Shares- Stock Units ( 4 ) 01/28/2013 M 3,105 ( 4 ) ( 4 ) Common stock 3,105 $ 31.18 4,917 D Restricted Stock Units- Key Manager Program ( 5 ) 01/28/2013 M 617 ( 5 ) ( 5 ) Common stock 617 $ 31.18 625 D Restricted Stock Unit Award 01/28/2013 ( 6 ) 01/28/2013 A 3,800 ( 6 ) ( 6 ) Common stock 3,800 $ 31.18 3,800 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other GLACE JOSEPH R 10 SOUTH DEARBORN STREET 54TH FLOOR CHICAGO, IL60603 SVP and Chief Risk Officer Signatures Scott N. Peters, Attorney in Fact for Joseph R. Glace 01/29/2013 Signature of Reporting Person Date

Explanation of Responses:

( 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 as of 12/31/2012. Shares acquired through the Exelon Employee Stock Purchase Plan. ( 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 units awarded pursuant to the Key Manager Program of the Exelon Long Term Incentive Plan. 1/3 of the shares awarded vest on each of the first, second and third 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. ( 6 )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.

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).

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