Edgar Filing: THACKER WILLIAM L

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

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(Print or Type Responses)

1. Name and Address of Reporting Person ^*

THACKER WILLIAM L

2. Issuer Name and Ticker or Trading Symbol
GenOn Energy, Inc. [GEN]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

__X__ Director	_____ 10% Owner
_____ Officer (give title below)	_____ Other (specify below)

(Last)

(First)

(Middle)

1000 MAIN STREET

3. Date of Earliest Transaction (Month/Day/Year)
12/14/2012

(Street)

HOUSTON, TX 77002

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)
1.Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	12/14/2012		D		100,704	D	⁽¹⁾	0	D
Cash Units	12/14/2012		M		17,245	A	⁽²⁾	17,245	D
Cash Units	12/14/2012		D		17,245	D	⁽²⁾	0	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

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Stock Options

$ 8.7

12/14/2012

14,381

⁽³⁾

01/13/2016

Common Stock

14,315

⁽³⁾

Stock Options

$ 8.6

12/14/2012

14,540

⁽⁴⁾

05/10/2016

Common Stock

14,540

⁽⁴⁾

Cash Units

⁽²⁾

12/14/2012

17,245

⁽²⁾

Common Stock

17,245

$ 0

Reporting Owners

Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
THACKER WILLIAM L 1000 MAIN STREET HOUSTON, TX 77002	X

Signatures

/s/ William L. Thacker		12/18/2012
^**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)	The reporting person disposed of these shares in connection with the merger (the "Merger") involving GenOn Energy, Inc. and NRG Energy, Inc.("NRG") in exchange for shares of NRG common stock, based on the exchange ratio of 0.1216 and having a market value of $23.00 per share on the effective date of the Merger, plus cash consideration for fractional shares.
(2)	Each cash unit is the economic equivalent of one share of common stock of GenOn. The cash units were paid in cash in connection with the Merger based on the fair market value per share of GenOn common stock on the effective date of the Merger.
(3)	Upon completion of the Merger, this fully-vested option was converted into an option to purchase 1,748 shares of NRG common stock at $71.55 per share.
(4)	Upon completion of the Merger, this fully-vested option was converted into an option to purchase 1,768 shares of NRG common stock at $70.73 per share.

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