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Business Context and Reporting Period

This summary covers the Form 10-Q filed by ACE Limited (referred to as ACE) for the quarterly period ended September 30, 2007. ACE is a Bermuda-based holding company providing a broad range of insurance and reinsurance products globally. The company operates through four primary segments: Insurance – North American, Insurance – Overseas General, Global Reinsurance, and Life Insurance and Reinsurance.

Key Financial Metrics

Material Changes vs. Prior Period

• Revenue Growth: Net premiums earned increased 2% in the quarter and 5% year-to-date compared to 2006, driven by foreign exchange strength (weak U.S. dollar) and growth in retail business, offset by declines in wholesale and reinsurance lines due to competitive conditions.
• Profitability: Net income rose 13% in the quarter and 22% year-to-date. The increase was supported by a 19% rise in net investment income and favorable prior period loss development.
• Loss Ratios: The P&C combined ratio improved to 87.8% for the nine months ended September 30, 2007, compared to 88.1% in the prior year. This improvement was driven by a 1.4% favorable prior period development of $128 million, partially offset by $136 million in net catastrophe losses (primarily U.K. floods, Australian floods, and European windstorm Kyrill).
• Investment Portfolio: Total investments grew to $41.47 billion from $36.60 billion at year-end 2006. The portfolio includes $272 million in sub-prime mortgage exposure (less than 1% of total assets) and no collateralized debt obligations.

Guidance, Outlook, Risks, and Unusual Items

• Accounting Changes: The company adopted FIN 48 (Accounting for Uncertainty in Income Taxes) on January 1, 2007, resulting in a $22 million reduction to retained earnings. FAS 155 was also adopted, resulting in a $12 million reclassification within equity.
• Legal Proceedings: ACE is involved in numerous investigations and lawsuits regarding underwriting practices and contingent commissions. Notable settlements in 2007 included $9 million with Pennsylvania authorities and $4.5 million with nine other states. A major federal class action regarding antitrust and RICO claims was dismissed with prejudice in August/September 2007, though plaintiffs have appealed.
• Catastrophe Exposure: Modeled annual aggregate 1-in-100-year U.S. hurricane probable maximum loss is approximately $974 million (net of reinsurance), representing about 6% of shareholders' equity.
• Liquidity: The company maintains $2.8 billion in available credit lines, with $1.6 billion utilized as of September 30, 2007. Management anticipates positive operating cash flows will cover obligations through 2007.
• Dividends: Dividends declared on Ordinary Shares totaled $260 million for the nine months ended September 30, 2007.

Investor Verification Checklist

• Reinsurance Recoverables: Verify the collectibility of the $14.2 billion in reinsurance recoverables, particularly given the provision for uncollectible reinsurance of $649 million.
• Asbestos and Environmental (A&E) Reserves: Review the $1.96 billion in net A&E reserves (as of June 30, 2007) and the adequacy of the $256 million remaining limit under the Aggregate Excess of Loss Agreement for Brandywine run-off entities.
• Legal Settlements: Monitor the status of the appealed federal antitrust/RICO rulings and potential future settlements related to industry practice investigations.
• Sub-prime Exposure: Assess the impact of the $272 million sub-prime mortgage exposure on the investment portfolio given market volatility.
• Foreign Exchange Impact: Evaluate the sustainability of revenue growth given the significant contribution of foreign exchange rates (weak U.S. dollar) to reported premium increases.