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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1. Name and Address of Reporting Person * CLARK FRANK M   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) Chairman and CEO of ComEd (Last) (First) (Middle) 10 SOUTH DEARBORN STREET, 54TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 08/01/2009 (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 08/01/2009   M   10,000 A $ 50.86 37,038 (1) D   Common Stock 08/01/2009   F   3,949 (2) D $ 50.86 33,089 D   Common Stock 08/01/2009   D   6,051 (3) D $ 50.86 27,038 D

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

Restricted Stock Units 07/27/2009

$ 0 (4)

08/01/2009

M

5,000

(4)

(4)

Common Stock

5,000

$ 50.86

0

D

Restricted Stock Units 08/01/2004

$ 0 (5)

08/01/2009

M

5,000

(5)

(5)

Common Stock

5,000

$ 50.86

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
CLARK FRANK M 10 SOUTH DEARBORN STREET 54TH FLOOR CHICAGO, IL 60603			Chairman and CEO of ComEd

Signatures

Scott N. Peters, Attorney in Fact for Frank M. Clark		08/04/2009
**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 305 shares acquired on 3/10/2009 and 282 shares acquired on 6/10/2009 through the automatic dividend reinvestment feature of Exelon plans.
(2)	Shares witheld to satisfy the reporting person's income tax liability due upon vesting.
(3)	Vested shares settled in cash on a 1 for 1 basis.
(4)	Restricted stock units granted 07/27/2009 under the Exelon Long Term Incentive Plan. Restricted stock units may be settled in cash on a 1 for 1 basis based on the closing price of Exelon common stock on the day of vesting.
(5)	Restricted stock units granted 08/01/2004 under the Exelon Long Term Incentive Program. Restricted stock units may be settled for cash on a 1 for 1 basis based on the closing price of Exelon common stock on the day of vesting.

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