OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has assigned a Financial Strength Rating of A (Excellent) and a Long-Term Issuer Credit Rating of “a” to Split Rock Insurance, Ltd. (Split Rock) (Bermuda). The outlook assigned to these Credit Ratings (ratings) is stable. Split Rock is a wholly owned subsidiary of OneBeacon Insurance Group, Ltd. (OneBeacon) [NYSE:OB]. Split Rock was established in 2013 to reinsure its affiliate, Atlantic Specialty Insurance Company (ASIC), also a subsidiary of OneBeacon
