Statistics can tell a lot, not only about the financial health of companies, but also how they stack up against one another. In this annual feature, we take the pulse of 50 top-ranking life and health insurers when measured against four key metrics: net investment income, total enrollment (health lines only), policyholder surplus and net premiums written. 

The following ranks New York Life, Aetna, UnitedHealth, Vision Service Plan, Anthem and Kaiser Foundation Heatlh Plan as leaders in their respective categories. To see which other companies earned a spot on this annual list, read on. 

(Source for all data: S&P Global Market Intelligence)