Editor's Note: The NAIC has released a more precise dataset, which now reflects an estimated 96% of P&C rate filings. This story has been updated to include those details. During the past year, the P&C industry $791 billion in direct premiums written across all lines of business and slightly more than $761 billion in direct premiums earned, according to the National Association of Insurance Commissioners (NAIC) Property & Casualty Market share report. Roughly 96% of P&C insurance companies have reported so far. The largest amount of direct premiums written was in private passenger auto lines, which had $179 billion in premiums written as of March 1, 2022. This total is about 31% of all written premiums, the association reported. The NAIC's market share report has cumulative data for the following lines: cumulative market share data for the following lines of business: personal auto, commercial auto, workers' compensation, medical professional liability, homeowners, and other liability (excluding auto liability) insurance. The above slideshow highlights the top 10 P&C insurance companies based on premiums written during this past year.  What follows are the insurance companies that were ranked from 11 through 25 on the NAIC list for 2021.

  1. Zurich

Direct premiums written in 2021: $15.01 billion Direct premiums earned in 2021: $14.5 billion Market share: 1.90%

  1. AIG

Direct premiums written in 2021: $14.6 billion Direct premiums earned in 2021: $14.1 billion Market share: 1.86%

  1. The Hartford

Direct premiums written in 2021: $13.5 billion Direct premiums earned in 2021: $13.08 billion Market share: 1.71%

  1. CNA

Direct premiums written in 2021: $12.5 billion Direct premiums earned in 2021: $12.02 billion Market share: 1.59%

  1. American Family

Direct premiums written in 2021: $12.5 billion Direct premiums earned in 2021: $12.04 billion Market share: 1.59%

  1. Tokio Marine Holdings

Direct premiums written in 2021: $10.1 billion Direct premiums earned in 2021: $9.6 billion Market share: 1.28%

  1. Auto-Owners

Direct premiums written in 2021: $9.9 billion Direct premiums earned in 2021: $9.6 billion Market share: 1.25%

  1. Fairfax Financial

Direct premiums written in 2021: $9.5 billion Direct premiums earned in 2021: $8.6 billion Market share: 1.21%

  1. Assurant

Direct premiums written in 2021: $8.9 billion Direct premiums earned in 2021: $8.6 billion Market share: 1.13%

  1. WR Berkley Corp.

Direct premiums written in 2021: $8.2 billion Direct premiums earned in 2021: $7.6 billion Market share: 1.04%

  1. Erie Insurance

Direct premiums written in 2021: $7.8 billion Direct premiums earned in 2021: $7.2 billion Market share: 0.99%

  1. AXA

Direct premiums written in 2021: $7.7 billion Direct premiums earned in 2021: $7.3 billion Market share: 0.98%

  1. American Financial

Direct premiums written in 2021: $7.5 billion Direct premiums earned in 2021: $7.3 billion Market share: 0.94%

  1. Markel Corp.

Direct premiums written in 2021: $7.4 billion Direct premiums earned in 2021: $6.8 billion Market share: 0.94%

  1. SOMPO

Direct premiums written in 2021: $6.5 billion Direct premiums earned in 2021: $6.03 billion Market share: 0.83%

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