SC 13G/A

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

(Amendment No. 1)

Under the Securities Exchange Act of 1934

ATP Oil & Gas Corporation

(Name of Issuer)

Common Stock, par value $0.001

(Title of Class of Securities)

00208J108

(CUSIP Number)

December 31, 2012

(Date of Event Which Requires Filing of this Statement)

Check the following box to designate the rule pursuant to which the Schedule is filed:

¨ Rule 13d-1(b)

x Rule 13d-1(c)

¨ Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 00208J108
	1.	Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only) D. E. Shaw & Co., L.P. 13-3695715
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		¨
		(b)		¨
	3.	SEC Use Only
	4.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power -0-
			6.		Shared Voting Power -0-
			7.		Sole Dispositive Power -0-
			8.		Shared Dispositive Power -0-
	9.	Aggregate Amount Beneficially Owned by Each Reporting Person -0-
	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) ¨
	11.	Percent of Class Represented by Amount in Row (9) 0.0%
	12.	Type of Reporting Person (See Instructions) IA, PN

CUSIP No. 00208J108
	1.	Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only) David E. Shaw
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		¨
		(b)		¨
	3.	SEC Use Only
	4.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power -0-
			6.		Shared Voting Power -0-
			7.		Sole Dispositive Power -0-
			8.		Shared Dispositive Power -0-
	9.	Aggregate Amount Beneficially Owned by Each Reporting Person -0-
	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) ¨
	11.	Percent of Class Represented by Amount in Row (9) 0.0%
	12.	Type of Reporting Person (See Instructions) IN

Item 1.

(a)	Name of Issuer
	ATP Oil & Gas Corporation
(b)
	Address of Issuer's Principal Executive Offices
	4600 Post Oak Place, Suite 100
	Houston, Texas 77027

Item 2.

(a)	Name of Person Filing
	D. E. Shaw & Co., L.P.
	David E. Shaw
(b)	Address of Principal Business Office or, if none, Residence
	The business address for each reporting person is:
	1166 Avenue of the Americas, 9th Floor
	New York, NY 10036
(c)	Citizenship
	D. E. Shaw & Co., L.P. is a limited partnership organized under the laws of the state of Delaware.
	David E. Shaw is a citizen of the United States of America.
(d)	Title of Class of Securities
	Common Stock, par value $0.001
(e)	CUSIP Number
	00208J108

Item 3. If this statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) or (c), check whether the person filing is a:

Not Applicable

Item 4. Ownership

As of December 31, 2012:

(a)	Amount beneficially owned:
	D. E. Shaw & Co., L.P.:	-0- shares

David E. Shaw: -0- shares

(b)	Percent of class:
	D. E. Shaw & Co., L.P.:	0.0%
	David E. Shaw:	0.0%

(c) Number of shares to which the person has:

(i)	Sole power to vote or to direct the vote:
	D. E. Shaw & Co., L.P.:	-0- shares
	David E. Shaw:	-0- shares

(ii)	Shared power to vote or to direct the vote:
	D. E. Shaw & Co., L.P.:	-0- shares
	David E. Shaw:	-0- shares

(iii)	Sole power to dispose or to direct the disposition of:
	D. E. Shaw & Co., L.P.:	-0- shares
	David E. Shaw:	-0- shares
(iv)	Shared power to dispose or to direct the disposition of:
	D. E. Shaw & Co., L.P.:	-0- shares
	David E. Shaw:	-0- shares

Item 5. Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following S.

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

Not Applicable

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.

Not Applicable

Item 8. Identification and Classification of Members of the Group

Not Applicable

Item 9. Notice of Dissolution of Group

Not Applicable

Item 10. Certification

By signing below, each of D. E. Shaw & Co., L.P. and David E. Shaw certify that, to the best of such reporting person’s knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having such purposes or effect.

SIGNATURE

After reasonable inquiry and to the best of their knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct. A Power of Attorney, dated June 22, 2012, granted by David E. Shaw in favor of Nathan Thomas, is attached hereto.

Dated: February 14, 2013

D. E. Shaw & Co., L.P.
By:	/s/ Nathan Thomas
	Nathan Thomas
	Chief Compliance Officer

David E. Shaw
By:	/s/ Nathan Thomas
	Nathan Thomas
	Attorney-in-Fact for David E. Shaw

EX-1

Exhibit 1

POWER OF ATTORNEY

FOR CERTAIN REGULATORY FILINGS

INCLUDING CERTAIN FILINGS

UNDER THE SECURITIES EXCHANGE ACT OF 1934

AND THE INVESTMENT ADVISERS ACT OF 1940

I, David E. Shaw, hereby make, constitute, and appoint each of:

Anne Dinning,

Julius Gaudio,

John Liftin,

Louis Salkind,

Maximilian Stone,

Nathan Thomas, and

Eric Wepsic,

acting individually, as my agent and attorney-in-fact, with full power of substitution, for the purpose of, from time to time, (i) executing in my name and/or my capacity as President of D. E. Shaw & Co., Inc. (acting for itself or as the general partner of D. E. Shaw & Co., L.P. and general partner, managing member, or manager of other entities, any of which in turn may be acting for itself or other entities) all documents, certificates, instruments, statements, other filings, and amendments to the foregoing (collectively, “documents”) determined by such person to be necessary or appropriate to comply with any registration or regulatory disclosure requirements and/or ownership or control-person reporting requirements imposed by any United States or non-United States governmental or regulatory authority, including without limitation Form ADV, Forms 3, 4, 5, and 13F, and Schedules 13D and 13G required to be filed with the United States Securities and Exchange Commission, and (ii) delivering, furnishing, or filing any such documents to or with the appropriate governmental or regulatory authority. Any such determination shall be conclusively evidenced by such person’s execution, delivery, furnishing, and/or filing of the applicable document.

This power of attorney shall be valid from the date hereof and replaces the power granted on December 15, 2011, which is hereby cancelled.

IN WITNESS HEREOF, I have executed this instrument as of the date set forth below.

Date: June 22, 2012

DAVID E. SHAW, as President of

D. E. Shaw & Co., Inc.

/s/ David E. Shaw

New York, New York