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 *
  O'Neal John L
 2. Date of Event Requiring Statement (Month/Day/Year)
05/31/2009		 3. Issuer Name and Ticker or Trading Symbol
MIRANT CORP [MIR]
(Last)
(First)
(Middle)
1155 PERIMETER CENTER WEST		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP and Chf Commercial Officer
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

ATLANTA, GA 30338		 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 56,865 (1)
D
 

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
Stock Options   (2) 01/13/2016 Common Stock 7,891 $ 24.64 D  
Stock Options   (2) 02/17/2016 Common Stock 15,524 $ 25.05 D  
Stock Options   (3) 03/08/2012 Common Stock 10,567 $ 37.71 D  
Stock Options   (4) 03/07/2013 Common Stock 15,693 $ 37.02 D  
Stock Options   (5) 03/03/2019 Common Stock 28,979 $ 10.4 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
O'Neal John L
1155 PERIMETER CENTER WEST
ATLANTA, GA 30338		       SVP and Chf Commercial Officer  

Signatures

/s/ David E. Howard, Attorney-in-Fact 06/08/2009
**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) Includes 35,584 restricted stock units that are subject to time-based vesting. Includes 10,146 restricted stock units that vested 100% on June 30, 2008 and will be delivered to the reporting person on his termination date. Each restricted stock unit represents a contingent right to receive one share of Mirant Corporation common stock.
(2) The stock options are fully vested.
(3) Includes 7,045 stock options that are fully vested and 3,522 stock options which will vest on 3/08/10.
(4) Includes 5,231 stock options that are fully vested and 10,462 stock options which will vest 50% on 3/07/2010 and 50% on 3/07/2011.
(5) The stock options have a three year vesting period, 33 1/3% on 3/03/2010, 33 1/3% on 3/03/2011 and 33 1/3% on 3/03/2012.
 
Remarks:
Exhibit List 24.1 - Power of Attorney dated May 27, 2009

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