Ownership Submission
FORM 5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Form 3 Holdings Reported
Form 4 Transactions Reported
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

ANNUAL 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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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. Statement for Issuer's Fiscal Year Ended (Month/Day/Year)
12/31/2009
(Street)


CHICAGO, IL 60603		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Reporting
(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 at end of Issuer's Fiscal Year
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Amount (A) or (D) Price
Common Stock             25,639 D  
Common Stock - ESPP Shares             1,405 D  
Common Stock - Deferred Shares             6,559 (1) I By Stock Deferral Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. 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. SEC 2270 (9-02)

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 at End of Issuer's Fiscal Year
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
(A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Performance Shares - Stock Units               (2)   (2) Common Stock
20,436
  20,436 (3)
D
 
Deferred Comp. Phantom Shares               (4)   (4) Common Stock
2,902
  2,902
D
 
NQ Stock Options 02/29/2000 $ 18.66             (5)   (5) Common Stock
8,000
  8,000
D
 
NQ Stock Options 08/01/2000 $ 21.91             (5)   (5) Common Stock
9,000
  9,000
D
 
NQ Stock Options 01/27/2003 $ 24.805             (6)   (6) Common Stock
30,000
  30,000
D
 
NQ Stock Options 01/26/2004 $ 32.54             (6)   (6) Common Stock
30,000
  30,000
D
 
NQ Stock Options 01/24/2005 $ 42.85             (6)   (6) Common Stock
29,000
  29,000
D
 
NQ Stock Options 01/23/2006 $ 58.55             (6)   (6) Common Stock
20,000
  20,000
D
 
NQ Stock Options 01/22/2007 $ 59.96             (6)   (6) Common Stock
19,000
  19,000
D
 
NQ Stock Options 01/28/2008 $ 73.29             (6)   (6) Common Stock
22,000
  22,000
D
 
NQ Stock Options 01/26/2009 $ 56.51             (6)   (6) Common Stock
30,700
  30,700
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 02/12/2010
**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) Balance includes the following shares acquired through the automatic dividend reinvestment feature of Exelon plans: 72 shares on 3/10/2009; 67 shares on 6/10/2009; 69 shares on 9/10/2009; and 67 shares on 12/10/2009.
(2) Performance Shares awarded pursuant to the Exelon Long Term Incentive Plan. 1/3 of the shares awarded vested 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.
(3) Balance includes the following shares acquired through the automatic dividend reinvestment feature of Exelon plans: 226 shares on 3/10/2009; 209 shares on 6/10/2009; 216 shares on 9/10/2009; and 208 shares on 12/10/2009.
(4) Phantom shares held in a multi-fund deferred compensation plan to be settled for cash upon the reporting person's termination of employment for any reason on a 1:1 basis. Shares are acquired through regular periodic contributions, company matching contributions, and the automatic reinvestment of dividends.
(5) Non qualified employee stock options, awarded pursuant to the Exelon Long Term Incentive Plan. Options vest in 1/3 increments on each of the first three anniversaries of the grant date, referenced in column one, and expire on the tenth anniversay of the grant date.
(6) Non qualified employee stock options, awarded pursuant to the Exelon Long Term Incentive Plan. Options vest in 1/4 increments on each of the first four anniversaries of the grant date, referenced in column one, and expire on the tenth anniversay of the grant date.

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