Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  BUTLER CALVIN JR
2. Date of Event Requiring Statement (Month/Day/Year)
03/01/2014
3. Issuer Name and Ticker or Trading Symbol
EXELON CORP [EXC]
(Last)
(First)
(Middle)
10 SOUTH DEARBORN STREET, 54TH FLOOR
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
CEO, BGE
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CHICAGO, IL 60603
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 Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 6,326
D
 
Common Stock (401k shares) 411 (1)
I
Held by 401k Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Performance Shares- Units 01/27/2013   (2)   (2) Common stock 2,458 $ (2) D  
Restricted Stock Units 01/27/2013   (3)   (3) Common stock 3,115 $ (3) D  
Restricted Stock Units 01/27/2014   (4)   (4) Common stock 5,200 $ (4) D  
Restricted Stock Units 03/13/2012   (5)   (5) Common stock 5,000 $ (5) D  
NQ Stock Options 01/24/2011   (6)   (6) Common stock 15,000 $ 43.4 D  
NQ Stock Options 03/12/2012   (6)   (6) Common stock 16,000 $ 39.81 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
BUTLER CALVIN JR
10 SOUTH DEARBORN STREET
54TH FLOOR
CHICAGO, IL 60603
      CEO, BGE  

Signatures

Scott N. Peters, Attorney in fact for Calvin Butler, Jr. 03/04/2014
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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 held as of February 28, 2014 in a multi-fund 401(k) Plan to be settled in 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.
(2) Performance shares awarded pursuant to the Exelon Long Term Incentive Plan. 1/3 of the units vested immediately upon receipt, and 1/3 vest on each of the first and second anniversaries of the award date. Under certain circumstances some or all of the vested units may be settled in cash on a 1 for 1 basis based on the price of the underlying stock on the date of vesting. Balance reported represents the final third of the grant.
(3) Restricted stock unit granted pursuant to the Exelon Long Term Incentive Plan. Accrues dividend units that vest when the underlying units vest. 1/3 of the units and the related dividend units vest on each of the first three anniversaries of the grant date referenced in column 1. Balance reported represents the second and third tranches of units and associated dividend units.
(4) Restricted stock unit granted pursuant to the Exelon Long Term Incentive Plan. Accrues dividend units that vest when the underlying units vest. 1/3 of the units and the related dividend units vest on each of the first three anniversaries of the grant date referenced in column 1.
(5) Restricted stock unit award made pursuant to the Exelon Long Term Incentive Plan. 100% of the shares will vest on March 13, 2014.
(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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