To start, there are independent rating agencies that analyze the financials of insurers and issue financial strength ratings of the insurers, which is an indication of the insurance company's ability to pay their claims and meet their financial obligations.
The higher the financial rating, the more financial secure the insurance company which is what you want so they are able to pay any claim on your life insurance policy.
In addition, each year the Insurance Information Institute issues a list of the top life insurance companies based on several factors, such as the amount of individual life insurance policies issued the previous year.
Here is how you can learn more about the best life insurance companies ratings and compare top insurers.