Our A.M. Best Rating: A+

A.M. Best Co. has upgraded the financial strength rating (FSR) to A+ (Superior) from A- (Excellent) and the issuer credit rating (ICR) to "aa-" from "a-" of American Mining Insurance Company. The ratings have been removed from under review with positive implications and assigned a stable outlook.

W. R. Berkley Corporation, founded in 1967, is an insurance holding company that operates in five segments of the property casualty insurance business: specialty insurance, regional property casualty insurance, alternative markets, reinsurance and international. W. R. Berkley Corporation is a Fortune 500 company and is listed on the New York Stock Exchange under the symbol BER.