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NAIC 2018 Property-Casualty Insurer Market Share Data Show Growth

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July 01, 2019

The National Association of Insurance Commissioners (NAIC) has released complete market share data on property-casualty insurers. The 2018 Market Share Reports for Property/Casualty Groups and Companies By State and Countrywide includes detailed information on market share and loss ratios for property-casualty companies by specific line of business.

Updated annually, the report includes cumulative market share data for the top 10 writers by state and for the top 125 writers 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.

A few property-casualty report highlights are as follows.

  • The top 10 groups made up 47 percent 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 percent increase in written premiums in the US market compared to 2017.
  • By line of business, commercial auto liability had the largest increase in written premium, 13.14 percent, compared to 2017.
  • There was a 109 percent increase in written premium for burglary and theft over the last 10 years, the largest of any line of business.

The property-casualty report includes market shares for 30 lines of business, plus aggregate write-ins for other lines of business and the total for all lines.

The top 5 ranking insurers in terms of direct premiums written for commercial auto, workers compensation, medical professional liability, and other liability are as follows.
Commercial Auto  Workers
Medical Professional Liability  Other Liability (excluding auto)
Progressive Travelers Berkshire Hathaway Chubb
Travelers Hartford Doctors Company AIG
Liberty Mutual Berkshire Hathaway CNA Travelers
Nationwide Zurich ProAssurance Assurant
Berkshire Hathaway Amtrust Coverys Liberty Mutual

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