Workers' compensation insurance companies

• Accident Fund
• American International Group (AIG)
• Cincinnati Financial Corporation
• Erie Insurance Group
• GUARD Insurance Group
• Hanover Insurance
• The Hartford
• Liberty Mutual
• Merchants Insurance Group
• Missouri Employers Mutual
• Nationwide Mutual Insurance Company
• The Norfolk & Dedham Group
• Penn National Insurance
• Sentry Insurance
• State Farm Insurance
• WellPoint
• Zenith Insurance Company