Ownership Submission
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
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
CLARK MARK T
  2. Issuer Name and Ticker or Trading Symbol
FIRSTENERGY CORP [FE]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Exec VP, Finance & Strategy
(Last)
(First)
(Middle)
76 SOUTH MAIN STREET
3. Date of Earliest Transaction (Month/Day/Year)
03/08/2013
(Street)

AKRON, OH 44308
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 03/08/2013   M   8,857 (1) A $ 40.82 112,979.992 D  
Common Stock 03/08/2013   A   18,084 (1) A $ 40.82 131,063.992 D  
Common Stock 03/08/2013   F   10,921 (1) D $ 40.82 120,142.992 D  
Common Stock 01/16/2013   G V 2,500 D $ 0 105,122.992 D  
Common Stock 01/28/2013   G V 1,000 D $ 0 104,122.992 D  
Common Stock               1,262.2 I In Savings 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 1474 (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 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
RSUP18 (2) 03/08/2013   A   16,926 (3)   03/01/2016 03/01/2016 Common Stock 16,926 $ 40.82 16,926 D  
RSUP14 (2) 03/08/2013   M     8,857 (1) 03/08/2013 03/08/2013 Common Stock 8,857 $ 0 0 D  
Phantom / Retirement (2)               (4)   (4) Common Stock 3,657.228   3,657.228 D  
RSUP16 (2)             03/04/2014 03/04/2014 Common Stock 9,436   9,436 D  
RSUP17 (2)             03/05/2015 03/05/2015 Common Stock 16,082   16,082 D  
Stock Options (Right to Buy) $ 37.75             12/31/2012 02/25/2021 Common Stock 100,322   100,322 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
CLARK MARK T
76 SOUTH MAIN STREET
AKRON, OH 44308
      Exec VP, Finance & Strategy  

Signatures

 Edward J. Udovich, POA   03/12/2013
**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) RSUP14 award listed in Table II has been reported at 50% of the original grant amount, as that represents the minimum amount guaranteed to be paid out upon vesting. Because of the performance targets were achieved, the award was paid out on March 8, 2013 at a performance rate of 150%. The shares coded "A" represent that portion attributable to this performance adjustment. The shares coded "F" were withheld to cover income tax obligations associated with the payout.
(2) 1 for 1
(3) This transaction is a performance-adjusted restricted stock unit grant (RSUP18) of which 50% is reflected in table II. Of the total shares granted, 50% of the shares are subject to forfeiture if the performance goals are not met. The full grant can be adjusted upward by an additional 50% if the 3-year goals are achieved.
(4) This transaction reflects the extension and vesting of phantom stock to retirement or other termination of employment under arrangements approved by the Compensation Committee.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.