SHAREHOLDER ALERT: Brower Piven Informs Investors With Substantial Losses from Investment in ATP Oil & Gas Corporation That Less

  SHAREHOLDER ALERT: Brower Piven Informs Investors With Substantial Losses
  from Investment in ATP Oil & Gas Corporation That Less Than Three Weeks
  Remain To Seek Appointment As Lead Plaintiff In Securities Class Action

Business Wire

STEVENSON, Md. -- September 19, 2013

Brower Piven, A Professional Corporation announces that a class action lawsuit
has been commenced in the United States District Court for the Southern
District of Texas on behalf of purchasers of ATP Oil & Gas Corporation (“ATP”
or the “Company”) (OTC: ATPAQ) common stock during the period between December
16, 2010 and August 17, 2012, inclusive (the “Class Period”).

If you have suffered a net loss from investment in ATP Oil & Gas Corporation
common stock purchased on or after December 16, 2010, and held through any of
the revelations of negative information on August 10, 2012 and/or August 17,
2012, as described below, you may obtain additional information about this
lawsuit and your ability to become a lead plaintiff by contacting Brower Piven
at, by email at, by calling
410/415-6616, or at Brower Piven, A Professional Corporation, 1925 Old Valley
Road, Stevenson, Maryland 21153. Attorneys at Brower Piven have combined
experience litigating securities and class action cases of over 60 years.

No class has yet been certified in the above action. Members of the Class will
be represented by the lead plaintiff and counsel chosen by the lead plaintiff.
If you wish to choose counsel to represent you and the Class, you must apply
to be appointed lead plaintiff no later than October 4, 2013 and be selected
by the Court. The lead plaintiff will direct the litigation and participate in
important decisions including whether to accept a settlement and how much of a
settlement to accept for the Class in the action. The lead plaintiff will be
selected from among applicants claiming the largest loss from investment in
the Company during the Class Period.

The complaint accuses the defendants of violations of the Securities Exchange
Act of 1934 by virtue of the defendants’ failure to disclose the impact that
two successive United States Department of the Interior moratoria for
deepwater drilling operations in the Gulf of Mexico had on the Company’s
operations and revenues and the Company’s breach of certain credit agreements
by engaging in disguised financing arrangements that were designed to evade
the requirements of such credit agreements. According to the Complaint,
following reports on August 10, 2012 that the Company might file for
bankruptcy and the Company’s August 17, 2012 disclosure that it was filing for
Chapter 11 bankruptcy, the value of ATP shares declined significantly.

If you choose to retain counsel, you may retain Brower Piven without financial
obligation or cost to you, or you may retain other counsel of your choice. You
need take no action at this time to be a member of the class.


Brower Piven, A Professional Corporation
Stevenson, Maryland
Charles J. Piven, 410/415-6616
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