ATP Oil & Gas Hosts Webcast for First Quarter 2006 Results

Business Wire, May 9, 2006

HOUSTON -- ATP Oil & Gas Corporation's (Nasdaq:ATPG) Chairman and President T. Paul Bulmahn and members of the Company's senior management team will discuss results of the first quarter 2006 during a conference call to be web cast live at 10 a.m. CDT on May 10, 2006. ATP expects to issue a press release announcing first quarter 2006 results after the close of market on Tuesday, May 9.

1st Quarter 2006 Conference Call

Date: May 10, 2006
Time: 11:00 A.M. EDT, 10:00 A.M. CDT, 9:00 A.M. MDT, 8:00 A.M. PDT

To participate in the web cast, log on to ATP's web site at www.atpog.com at least 10 minutes prior to the start of the call and follow the links to Investor Info, then Conference Calls. To listen via the telephone, dial 877-707-9631. A recorded replay will be available at 888-203-1112, Conference ID number 4223348, for 24 hours after the call beginning at 1 p.m. CDT and the web cast will be archived on ATP's web site for 30 business days.

About ATP Oil & Gas

ATP Oil & Gas is a development and production company of natural gas and oil in the Gulf of Mexico and the North Sea. The Company trades publicly as ATPG on the NASDAQ National Market.