THE CORPORATE LIBRARY

Related Party Transactions and Outside Related Director Information

ATP Oil & Gas Corporation (ATPG)

5/1/2006 Proxy Information

Mr. Adams is President of Oil & Gas Rental Services, Inc. (“Oil & Gas Rental”), a rental equipment supplier to the oil and gas industry. In the ordinary course of business, from time to time, ATP rents oilfield goods, equipment and obtains related services from Oil & Gas Rental. ATP’s payments to Oil & Gas Rental over their last three fiscal years constitute less than 1.5% of their total revenues in each of such fiscal years. We believe that all negotiations with Oil & Gas Rental have been on an arms-length basis and in the ordinary course of business. ATP will continue to monitor its business relationship with Oil & Gas Rental in accordance with applicable rules of the SEC and the NASDAQ.