It depends on the state you live in, your age, health condition, occupation, hobbies, height-to-weight ratio, if you smoke or not, credit history, driving record, family health history, etc.
However, some of the leading life insurance companies include Northwestern Mutual, Prudential, and Metlife among others.
Each year, the III.org (Insurance Information Institute) issues a list of the top life insurance companies writing the most life insurance premium from the previous year.
Here's a list of the Top 10 life insurance companies in America, including their financial strength ratings. You can review the list and request your free life insurance quote online.