- AIG
- Catlin Insurance Company
- Chubb
- Chubb
- CNA
- Donegal
- Grange
- Great American
- Hanover
- Hartford
- Liberty Mutual
- Lloyd's
- Markel
- Nationwide
- New Hampshire
- North American Specialty
- Ohio Casualty
- Old United
- One Beacon
- Philadelphia
- PMA
- Progressive
- Safeco
- Seaworthy
- Selective
- State Auto
- The Philadelphia Contributionship
- Travelers
- W. R. Berkley Corporation
- XL Specialty
- Zurich