OREANDA-NEWS. A.M. Best has affirmed the Financial Strength Rating of A (Excellent) and the Long-Term Issuer Credit Rating of “a+” of AMEX Assurance Company (AMEX Assurance) (Chicago, IL). AMEX Assurance is a wholly owned subsidiary of American Express Company (American Express) [NYSE: AXP]. The outlook of these Credit Ratings (ratings) is stable.