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Property and Casualty Insurance Industry Shows Growth Nationally

NAIC Releases 2018 Property/Casualty Market Share Data

WASHINGTON (June 28, 2019) — The National Association of Insurance Commissioners (NAIC) released data on property/casualty insurers. The 2018 Market Share Reports for Property/Casualty Groups and Companies includes detailed information on market share and loss ratios for property/casualty companies by specific line of business.

A few highlights from the report include:

  • The top 10 groups made up 47% of the property and casualty market in the United States
  • Private passenger auto liability is the top line of business with the highest amount of written premium
  • There was a 5.37% increase in written premiums in the U.S. market compared to 2017
  • By line of business, commercial auto liability had the largest increase in written premium, 13.14%, compared to 2017
  • There was a 109% increase in written premium for burglary and theft over the last 10 years, the largest of any line of business

Updated annually, the report includes data on the top 125 groups/companies countrywide. The report also provides the countrywide and by-state direct loss ratios for the top writers in each line of business, as well as a countrywide and by-state "total industry" loss ratio.

The data-filled report, and others like it produced by the NAIC, provide insurance professionals with industry-specific data and shows which companies are focused or specialize in a particular line of business.

About the NAIC

As part of our state-based system of insurance regulation in the United States, the National Association of Insurance Commissioners (NAIC) provides expertise, data, and analysis for insurance commissioners to effectively regulate the industry and protect consumers. The U.S. standard-setting organization is governed by the chief insurance regulators from the 50 states, the District of Columbia and five U.S. territories. Through the NAIC, state insurance regulators establish standards and best practices, conduct peer reviews, and coordinate regulatory oversight. NAIC staff supports these efforts and represents the collective views of state regulators domestically and internationally. For more information, visit

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