ATP Oil & Gas to Host Web Cast Call to Announce Record Proved Reserves, Fourth Quarter and Annual 2005 Results and Operations Update

Business Wire, March 8, 2006

HOUSTON -- ATP Oil & Gas Corporation (Nasdaq:ATPG) will host a live conference call on Thursday, March 9. Chairman and President T. Paul Bulmahn along with Senior Vice President Gerald W. Schlief, Chief Operating Officer Leland E. Tate and Chief Financial Officer Albert L. Reese, Jr. will discuss the Company's year-end results followed by a Q & A session. ATP expects to issue a press release announcing proved reserves, fourth quarter and annual 2005 results and an operations update after the close of market on Wednesday, March 8.

4th Quarter 2005 Conference Call

Date: March 9, 2006

Time: 11:00 AM ET, 10:00 AM CT, 9:00 AM MT, 8:00 AM PT

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 to the call via the telephone, dial 877-704-5378. A recorded replay will be available at 888-203-1112, Conference ID number 1499558 for 24 hours after the call beginning at 1 pm CT, 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.