OLDWICK, N.J., May 10, 2010 (BUSINESS WIRE) -- A.M. Best Co. has upgraded the issuer credit ratings (ICR) to "bbb+" from "bbb" and senior debt ratings of American Financial Group, Inc. (AFG) [NYSE/NASDAQ: AFG] and AAG Holding Company, Inc.

Concurrently, A.M. Best has upgraded the ICRs to "a+" from "a" and affirmed the financial strength ratings (FSR) of A (Excellent) of Great American Insurance Companies (Great American) and Mid-Continent Group (Mid-Continent) (Tulsa, OK) and their property/casualty members.