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)
Sr. Executive Vice President
(Last)
(First)
(Middle)

10 SOUTH DEARBORN STREET, 54TH FLOOR		 3. Statement for Issuer's Fiscal Year Ended (Month/Day/Year)
12/31/2017
(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             57,243 D  
Common Stock             10,000 I Held by spouse
Common Stock (ESPP Shares)             1,405 D  
Common Stock (Deferred Shares)             9,339 (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
Restricted Stock Unit Awards $ 0             (2)   (2) Common Stock
53,706
  53,706 (3)
D
 
Deferred Compensation Equivalent Shares $ 0             (4)   (4) Common Stock
6,145
  6,145 (5)
D
 
NQ Stock Option 03/12/2012 $ 39.81             (6)   (6) Common Stock
102,000
  102,000
D
 
NQ Stock Option 01/24/2011 $ 43.4             (6)   (6) Common Stock
49,000
  49,000
D
 
NQ Stock Option 01/25/2010 $ 46.09             (6)   (6) Common Stock
27,000
  27,000
D
 
NQ Stock Option 01/26/2009 $ 56.51             (6)   (6) Common Stock
30,700
  30,700
D
 
NQ Stock Option 01/28/2008 $ 73.29             (6)   (6) Common Stock
22,000
  22,000
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		       Sr. Executive Vice President  

Signatures

Scott N. Peters, Esq. Attorney in Fact for Denis P. O'Brien 01/19/2018
**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 inlcudes shares acquired through automatic dividend reinvestment as follows: 82, 81, 79 and 74 shares acquired on March 10, 2017, June 9, 2017, September 8, 2017 and December 9, 2017 respectively.
(2) Restricted stock unit awards made pursuant to the Exelon Long Term Incentive Plan. Share awards are made annually in January at the Compensation and Leadership Development committee's meeting and vest in 1/3 increments on the date of the committee's January meeting in the first, second and third years after the award was made.
(3) Balance consists of unvested shares remaining from the awards granted in January of the previous three years along with shares acquired through automatic dividend reinvestment as follows: 472, 468, 453 and 425 shares acquired on March 10, 2017, June 9, 2017, September 8, 2017 and December 9, 2017 respectively.
(4) Phantom share equivalents representing units held in the Exelon stock fund in a multi-fund, non-qualified deferred compensation plan. The Exelon stock fund is a unitized fund that consists of Exelon common stock and short term investments. Units of the fund will be settled upon the reporting person's separation from the board for any reason. Units will be settled in cash. Units are acquired through regular periodic contributions, company matching contributions and the reinvestment of dividend equivalents. The balance of phantom share equivalents may fluctuate from time to time due to fluctuations in the fund composition.
(5) Balance inlcudes 55, 58, 52 and 46 share equivalents accrued on February 13, 2017, May 11, 2017, August 11, 2017 and November 14, 2017 respectively thorugh automatic dividend reinvestment.
(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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