OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has assigned a financial strength rating of B+ (Good) and an issuer credit rating of “bbb-” to One Alliance Insurance Corporation (One Alliance) (San Juan, Puerto Rico). The outlook assigned to both ratings is stable. The ratings reflect One Alliance’s supportive risk-adjusted capitalization, efficient reinsurance structure and experienced management team. The ratings also reflect the benefits afforded by the company’s affiliated insurance agency, Niki