The National Association of Insurance Commissioners (NAIC) has ranked the top 25 property & casualty insurance companies and groups by countrywide premium for 2017. Each year, the NAIC releases this report providing market share information that indicates the degree of market concentration in lines of business and identifies leading insurance writers.
According to this year's report, direct premiums written among the top 25 P&C providers totaled over $638 billion in 2017, up from $610 billion in 2016. Many of the names on the 2017 list are the same as previous years, with a few changes in ranking.
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