- 21st Century
- AEIG
- AIG
- Andover Companies
- Applied Underwriters
- Chubb
- CNA
- Cumberland Insurance Group
- Encompass
- Farmers of Salem
- Foremost
- Franklin Mut.
- GNY
- Guard
- Hanover
- Harford Mut.
- Hartford
- IFA
- Imperium/Delos
- Liberty Mutual
- Magna Carta
- MAPFRE
- Merchants Insurance Group
- Mercury
- MetLife
- MiddleOak
- Nationwide
- NJSBA
- Norfolk & Dedham
- Ohio Casualty
- One Beacon
- Peerless
- Penn Millers
- Penn Natl.
- Personal Service Ins.
- Plymouth Rock Assurance
- Preferred Mutual
- Progressive
- Safeco
- SAIF
- Selective
- Skylands
- The Philadelphia Contributionship
- Travelers
- United Fire Group
- Utica First
- Utica National Insurance Group
- Zurich