| Blue Cross / Blue Shield |
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| First Comp Underwriters |
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| Hagerty Insurance |
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| Philadelphia Insurance Company |
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| Markel Insurance |
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| Acuity |
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| American West |
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| Berkley Classics |
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| Concorde General Agency |
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| Foremost Insurance Group (Principal Office Location: Caledonia, Michigan) |
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| The Hartford Financial Services Group, Inc. (Principal Office Location: Hartford, Connecticut) |
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| Kemper Insurance |
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| Austin Mutual Insurance Company |
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| Nationwide |
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| The Progressive Corporation (Principal Office Location: Mayfield Village, Ohio) |
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| Safeco |
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| Viking Insurance |
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| Dairyland |
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| CNA Surety Corporation (Principal Office Location: Chicago, Illinois) |
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| Wellmark |
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| Humana |
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| Mutual of Omaha |
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| Burns & Wilcox |
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| Northland Insurance |
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| Delta Dental |
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| Aetna |
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| RLI |
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| Zurich |
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| Main Street America Group |
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