ATP Oil & Gas Corporation had priced its public offering of 8.75 million shares of its common stock at a public offering price of $8.25 per share. The size of the common stock offering was increased from the previously announced 7.25 million shares. ATP has granted the underwriters a 30-day option to purchase up to 1.3125 million additional shares of common stock to cover any over-allotments.

Closing of the offering is expected to occur on or about June 17, 2009, subject to customary closing conditions. ATP intends to use the net proceeds from the offering to support capital expenditures related to its drilling and development activities, including development of wells at its Telemark Hub in the deepwater Gulf of Mexico, to reduce indebtedness and for general corporate purposes.

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