There are several independent agencies that rate insurance companies based on an in-depth study of their operations and financial stability. Some of the more widely known agencies are A.M. Best, Standard&Poor's, Fitch and Moody's. The rating is typically assigned in the form of letter grades, e.g., AAA or A+. Each insurance company's website will have a link to its ratings from these agencies.
You can also check out the PolicyGenius insurance company profiles, which have their ratings and other information you might find useful in your evaluation.Financial soundness is an important factor in deciding the company with which you want to do business.