- A. Central Insurance Company
- Acadia
- Adirondack Insurance Exchange
- Allianz
- Andover Companies
- Applied Underwriters
- Chubb
- Cincinnati Insurance Companies
- CNA
- Empire Underwriters
- Erie & Niagara Insurance Association
- Great American
- Hartford
- Kemper
- Liberty Mut.
- MEMIC
- Merchants Insurance Group
- Michigan Millers Mutual Insurance Company
- National Grange Mutual
- Natl. Interstate
- NYCM
- ORYX
- Philadelphia
- R-T Specialty
- Transguard
- Travelers
- Wesco
- Scott T. Hoffman, Managing Partner