The Chubb Corporation—

-- “aa-” on $600 million 6.5% senior unsecured notes, due 2038

-- “aa-” on $600 million 5.75% senior unsecured notes, due 2018

-- “aa-” on $800 million 6.0% senior unsecured notes, due 2037

-- “aa-” on $275 million 5.2% senior unsecured notes, due 2013

-- “aa-” on $200 million 6.8% senior unsecured debentures, due 2031

-- “aa-” on $100 million 6.6% senior unsecured debentures, due 2018

-- “a” on $1 billion 6.375% junior subordinated debentures, due 2067

The following debt rating has been affirmed:

The Chubb Corporation—

-- AMB-1+ on commercial paper

The following indicative ratings have been affirmed for securities under the shelf registration:

The Chubb Corporation—

-- “aa-” on senior unsecured debt

-- “a+” on subordinated debt

-- “a+” on preferred securities

-- “a” on preferred stock

The methodology used in determining these ratings is Best’s Credit Rating Methodology, which provides a comprehensive explanation of A.M. Best’s rating process and contains the different rating criteria employed in the rating process. Key criteria utilized include: “Risk Management and the Rating Process for Insurance Companies”; “Rating Natural Catastrophe Bonds”; “Analyzing Commercial Paper Programs”; “Catastrophe Analysis in A.M. Best Ratings”; “Insurance Holding Company and Debt Ratings”; “Equity Credit for Hybrid Securities”; “The Treatment of Terrorism Risk in the Rating Evaluation”; “Understanding BCAR for Property/Casualty Insurers”; “Understanding BCAR for Canadian Property/Casualty Insurers”; “Understanding Universal BCAR”; and “Rating Members of Insurance Groups.” Best’s Credit Rating Methodology can be found at

Founded in 1899, A.M. Best Company is the world's oldest and most authoritative insurance rating and information source. For more information, visit

Copyright © 2013 by A.M. Best Company, Inc. ALL RIGHTS RESERVED.

Copyright Business Wire 2010

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