- A.I.M. Mutual Insurance Companies
- Acadia
- AFM
- AIG
- AmTrust
- Andover Companies
- Bunker Hill Insurance
- Chubb
- Cigna
- CNA
- Commerce
- Crum & Forster
- Fidelity & Deposit
- Fireman's Fund
- FM Global
- Great American
- Greater NY Mut.
- Guardian
- GuideOne
- Hanover
- Hartford
- Liberty Mutual
- MEMIC
- MiddleOak
- MMG
- MPIUA f MA
- Mt. Washington
- Nationwide
- Navigators
- NGM
- Ohio Casualty
- One Beacon
- Patron's Oxford
- Peerless
- PEPIP
- Plymouth Rock Assurance
- PMA
- Progressive
- ProMutual
- Providence Mut.
- Quincy Mutual Group
- Safety
- Selective
- Travelers
- United Educators
- UNUM/Provident
- Utica National Insurance Group
- Vermont Mutual Insurance Group
- Zurich