Omega Specialty Insurance Company Ltd. (Bermuda) (OSIL) has been affirmed the financial strength rating of A- (excellent) and issuer credit rating (ICR) of "a-" by Best The outlook for both ratings remains stable.

In Best's opinion, OSIL's risk-adjusted capitalisation is likely to remain excellent in 2008 and 2009, supported by increasing retained earnings. Additionally, OSIL benefits from the financial flexibility of its parent, Omega Insurance Holdings Ltd. (OIH), which has demonstrated its ability to raise funds to support the group's growth, the ratings agency said.

Best has also affirmed the financial strength rating (FSR) of A- (excellent) and issuer credit rating of "a-" of AmerInst Insurance Group, Ltd. (Bermuda). The outlook for both ratings is stable.

These ratings reflect AmerInst's conservative reserve position, its niche expertise as a reinsurer of professional liability policies and adequate capitalisation.