- Accident Fund Insurance Company
- Auto-Owners
- Blue Choice Health Plan
- Blue Option
- Brick Street Mutual (Encova)
- Builders Insurance Group
- Central Mutual Insurance Company
- Chubb
- Employers
- Encova
- FCCI
- Foremost
- Frankenmuth
- Hagerty
- Harford Mutual
- Hartford
- ICW Group
- J.C. Taylor
- Liberty Mutual
- Lititz Mutual
- Main Street America
- Markel
- Nationwide
- Penn Natl.
- Philadelphia
- Progressive
- Safeco
- SCHB Self Ins. Fund
- Selective
- State Auto
- Stillwater Ins. Group
- Summit
- Travelers
- USLI
- Utica National Insurance Group