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 www.ambest.com/ratings/methodology.

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

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

Copyright Business Wire 2010

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