SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* DeFontes Kenneth William Jr. (Last) (First) (Middle) 10 SOUTH DEARBORN STREET 54TH FLOOR (Street) CHICAGO IL 60603 (City) (State) (Zip)	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) President & CEO, BGE
	3. Date of Earliest Transaction (Month/Day/Year) 08/03/2012
	4. If Amendment, Date of 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

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	08/03/2012		M(1)		7,500	A	$21.25	17,691(4)	D
Common Stock	08/03/2012		S(1)		7,500	A	$38.33	10,191	D
Common Stock - Restricted Stock Units								9,668(5)(6)	D
Common Stock- 401k Plan Shares								7,971(2)	I	by 401k Plan
Common Stock								11,777(7)	I	Held by Spouse

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 Securities Underlying Derivative Security (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: 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
NQ Stock Options 02/27/2009	$21.25	08/03/2012		M(1)			7,500	(3)	(3)	Common Stock	7,500	(3)	76,330	D

Explanation of Responses:

1. Exercise and all reported sales made pursuant to a rule 10b5-1 trading plan entered into on June 13, 2012.

2. Common stock as of 07/31/2012 held in a multi-fund 401(k) plan.

3. Non qualified employee stock options originally granted pursuant to the Constellation Energy Group Long Term Incentive Plan. Each Constellation option was converted from the right to purchase 1 share of Constellation common stock to the right to purchase 0.93 shares of Exelon common at a strike price equal to the quotient of the original Constellation strike price and 0.93. This grant became fully vested upon conversion on March 12, 2012. Options expire 10 years from the grant date referenced in Column 1.

4. Balance includes 103 shares acquired on 06/08/2012 through automatic dividend reinvestment.

5. Restricted stock units originally granted pursuant to the Constellation Energy Group Long Term Incentive Plan and each stock unit was converted to 0.93 stock units of Exelon Corporation on March 12, 2012. Stock units will settle in shares of Exelon common stock on a 1 for 1 basis upon vesting. Award will vest 1/3 in February 2013, 1/3 in February 2014 and 1/3 in February 2015.

6. Balance includes 97 shares aquired on 06/08/2012 through automatic dividend reinvestment.

7. Balance inlcudes 119 shares acquired on 06/08/2012 through automatic dividend reinvestment.

Remarks:

	Lawrence C. Bachman, Attorney in Fact for Kenneth W. DeFontes, Jr.	08/03/2012
	** Signature of Reporting Person	Date
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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 Number.