United States Property And Casualty Insurance Top Companies
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State Farm Mutual Automobile Insurance Co.
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Berkshire Hathaway Inc. (GEICO, National Indemnity)
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The Progressive Corp.
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Allstate Corp.
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Liberty Mutual Holding Co.
*Disclaimer: Top companies sorted in no particular order

United States Property And Casualty Insurance Market Concentration

United States Property And Casualty Insurance Company List
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State Farm Mutual Automobile Insurance Co.
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Berkshire Hathaway Inc. (GEICO, National Indemnity)
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The Progressive Corp.
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Allstate Corp.
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Liberty Mutual Holding Co.
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USAA
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Travelers Cos. Inc.
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Chubb Ltd.
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Nationwide Mutual Insurance Co.
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American International Group Inc.
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Farmers Insurance Group
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Hartford Financial Services Group
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CNA Financial Corp.
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W. R. Berkley Corp.
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American Family Insurance Group
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Old Republic International Corp.
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Tokio Marine (HCC)
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Markel Group Inc.
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Fairfax Financial Holdings Ltd. (Crum & Forster)
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Zurich North America
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Arch Capital Group Ltd.
Specific to United States Property And Casualty Insurance Market