A.M. Best has affirmed the financial strength rating (FSR) of A
(Excellent) and the issuer credit ratings (ICR) of “a” of Atlantic
Specialty Insurance Company (New York, NY) and its three U.S.
reinsured affiliates, collectively referred to as OneBeacon Insurance
At the same time, A.M. Best has affirmed the ICRs of “bbb” and debt
ratings of OneBeacon’s publicly traded parent, OneBeacon Insurance
for A.M. Best Affirms Ratings of White Mountains Insurance Group, Ltd., Its Subsidiaries and OneBeacon Insurance Group, Ltd. investment picks