AM Best has upgraded the Long-Term Issuer Credit Rating of Bermuda-based Golden Tree Reinsurance Limited to “bbb+” from “bbb”, citing its robust risk-adjusted capitalization, positive financial results and improving geographic diversification. The ratings agency said, “AM Best has upgraded the Long-Term Issuer Credit Rating [ICR] to “bbb+” [Good] from “bbb” [Good] and affirmed the Financial …