On October 12, 2021, ATP Oil & Gas Corp. went out of business as per its Chapter 7 liquidation filing under bankruptcy. ATP Oil & Gas Corp. engages in the acquisition, development, and production of oil and natural gas properties primarily in the Gulf of Mexico and the United Kingdom sector of the North Sea. The company also has interests in three deepwater licenses in the Mediterranean Sea off the coast of Israel.

As of December 31, 2011, it had estimated net proved reserves of 118.9 million barrels of crude oil equivalent (MMBoe), of which approximately 75.9 MMBoe were in the Gulf of Mexico and 42.9 MMBoe were in the North Sea. The company's reserves comprised approximately 78.6 million barrels of crude oil or other liquid hydrocarbons and 241.5 billion cubic feet of natural gas. It also owned leasehold and other interests in 38 offshore blocks and 49 wells comprising 23 subsea wells in the Gulf of Mexico, as well as had interests in 13 blocks and 2 company-operated subsea wells in the North Sea.

ATP Oil & Gas Corporation was founded in 1991 and is headquartered in Houston, Texas.