- Aegis
- American Collectors Insurance
- AmWINS
- Applied Underwriters
- Chesapeake Employers Ins.
- Chubb
- CNA
- CNA Surety
- Donegal
- First Insurance Funding
- Foremost
- Harford Mut. Ins. Co.
- Hartford
- Hiscox
- MAIF
- Markel
- Medical Mutual
- Peninsula
- Professionals Advocate
- Progressive
- Safeco
- Selective
- The Philadelphia Contributionship
- Utica National Insurance Group
- Westfield Insurance
- Walter A. Tilley, President