AM Best Removes From Under Review With Developing Implications and Affirms Credit Ratings of Topa Insurance Company and Dorchester Insurance Company, Ltd. OLDWICK, N.J.--(BUSINESS WIRE)--AM Best has removed from under review with developing implications and affirmed the Financial Strength Rating of A- (Excellent) and the Long-Term Issuer Credit Ratings of “a-” of Topa Insurance Company (Calabasas, CA) and its subsidiary, Dorchester Insurance Company, Ltd. (U.S. Virgin Islands). These companies, which collectively are referred to as Topa Insurance Group (Topa), are wholly owned subsidiaries of Topa Equities Ltd. The outlook assigned to these Credi