INVESTOR ALERT: Rosen Law Firm Announces Filing of Securities Class Action On Behalf of ATP Oil & Gas Corporation Common Stock Investors - ATPAQ

The Rosen Law Firm today announced that a class action lawsuit has been filed on behalf of all purchasers of the securities of ATP Oil & Gas Corp. (PINKSHEETS: ATPAQ) between December 16, 2010 and August 17, 2012.

To join the ATP class action, go to the website at http://rosenlegal.com or call Phillip Kim, Esq. or Kevin Chan toll-free at 866-767-3653 or email pkim@rosenlegal.com or kchan@rosenlegal.com for information on the class action.

NO CLASS HAS YET BEEN CERTIFIED IN THE ABOVE ACTION. UNTIL A CLASS IS CERTIFIED, YOU ARE NOT REPRESENTED BY COUNSEL UNLESS YOU RETAIN ONE. YOU MAY ALSO REMAIN AN ABSENT CLASS MEMBER AND DO NOTHING AT THIS POINT. YOU MAY RETAIN COUNSEL OF YOUR CHOICE.

According to the lawsuit, defendants caused ATP to issue materially false and misleading statements about ATP’s true business and financial condition in violation of the federal securities laws. Specifically, defendants materially misstated and/or failed to disclose that (a) ATP severely downplayed the impact that the United States Department of Interior moratoria had on the Company’s business and revenues; (b) ATP violated the provisions of certain credit agreements to which the Company was a party; and (c) misstated ATP’s liquidity and financial position. As a result of this misconduct, the complaint alleges that ATP investors lost nearly the entire value of their investment as ATP declared bankruptcy.

A class action lawsuit has already been filed on behalf of ATP investors. If you wish to serve as lead plaintiff, you must move the Court no later than October 4, 2013. If you wish to join the litigation or to discuss your rights or interests regarding this class action, please contact, Phillip Kim, Esq. or Kevin Chan of The Rosen Law Firm toll free at 866-767-3653 or via e-mail at pkim@rosenlegal.com or kchan@rosenlegal.com.

The Rosen Law Firm focuses on prosecuting securities class action litigation and actions involving financial fraud. The Rosen Law Firm represents investors throughout the globe concentrating its practice in securities class actions.