UHY Clients

ATP Oil & Gas Corporation

28th February, 2007

ATP Oil & Gas Corporation

ATP Oil & Gas Corporation is engaged in the acquisition, development and production of oil and natural gas properties in the Gulf of Mexico and the North Sea. ATP's core business is to acquire and develop properties with proven undeveloped reserves that are economically attractive to ATP but are not strategic to major or large exploration-orientated oil and gas companies. The estimated pre-tax proven reserves at 31st December 2005 were 2.7 billion USD. The company has leasehold and other interests in 76 offshore blocks, 53 platforms and 147 wells, including 11 subsea wells, in the Gulf of Mexico. ATP also has interests in 10 blocks and two company-operated subsea wells in the North Sea, the UK.

ATP was founded in 1991. In 2001 the company went public and is currently listed on the NASDAQ Global Select Market. Its global headquarters are in Houston, Texas, the US, with regional offices located in Guildford, the UK, and IJmuiden, the Netherlands.

In 2005 ATP became a client of UHY Advisors in the US. Managing Director Barbara Shirley says the client chose UHY for Sarbanes-Oxley work because of its international organisation and the experience her team had gained working on similar projects.

ATP interviewed each team member before selection and validated UHY’s industry and technical experience.

UHY’s strong international links meant that the project could be confidently assigned to local country offices, capitalising on local capabilities and expertise to the benefit of the client: UHY’s Houston office managed US-specific matters while the London office dealt with UK issues.

The same methodology and tools were used by UHY in both the US and the UK, resulting in seamless client service delivery and project integration.

Barbara Shirley says: “We replaced a larger firm that had international offices, so we would have been at a disadvantage had we not had the international network... It clearly helps in calls to say ‘Yes, we have a member firm there, and we have worked with such-and-such manager for other clients’.‿

Barbara says three key factors enabled UHY to win the contract:

• UHY’s ability to be seamless and to have clear lines of communication
• UHY’s high quality resources that understand and apply the same methodology
• UHY partners and firms committed to working together.

The contract between ATP and UHY has been renewed. Seven UHY executives work on the
account in the US and four in the UK.

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