OLDWICK, N.J.--( BUSINESS WIRE )-- AM Best has downgraded the Long-Term Issuer Credit Rating of Sompo International Holdings Ltd. (SIH) (Pembroke, Bermuda) from "a" (Excellent) to "a-" (Excellent). The downgrade is to harmonize the intermediate holding company Credit Ratings (ratings) of SIH with the Financial Strength Ratings of Sompo Japan Insurance Inc. (The ratings of the insurance operating companies of SIH. remain unchanged. Please see related press release dated Sept. 16, 2022.)