- Aetna
- AIG
- Chubb
- Cumberland Insurance Group
- Donegal
- Great American
- Harleysville
- Hartford
- Highmark BC/BS
- Liberty Mutual
- Lititz Mutual
- Millers Mutual
- Nationwide
- Penn National
- Philadelphia
- Progressive
- The Philadelphia Contributionship
- Travelers
- USLI
- VFIS
- Westminster American