- Acuity Insurance
- Aetna
- American Mining
- Anthem Blue Cross Blue Shield
- Auto-Owners
- BITCO Insurance Companies
- Brick Street Mutual (Encova)
- Central Insurance
- Chubb
- Chubb
- Cincinnati Casualty Company
- CNA
- Doctors Co.
- Encompass
- Encova
- F & D Cos.
- Foremost
- Great American
- Hanover
- Hartford
- Health Care 1
- KEMI
- Kemper
- Liberty Mutual
- Medical Mutual of Ohio
- Nationwide
- Philadelphia
- Progressive
- RLI Corp.
- Safeco
- Summit
- Travelers
- Utica National Insurance Group
- West Bend
- Zurich