The RLI Corp. ICR of "a" (Excellent) was affirmed and the ICRs of "aa" (Superior) have been affirmed for the following subsidiaries: RLI Insurance Company, Mt. Hawley Insurance Company and CBIC. AM Best, a global credit rating agency, news publisher and data analytics provider specializing in the insurance industry, stated in its press release that the ratings "reflect RLI's balance sheet strength, which AM Best assesses as strongest, as well as its strong operating performance, favorable business profile and very strong enterprise risk management." ABOUT RLI RLI Corp. (NYSE: RLI) is a specialty insurer serving niche property, casualty and surety markets.