- American Commerce Insurance
- American Modern Insurance Group
- American Risk Insurance (ARI)
- American Strategic Insurance
- Andover Companies
- Applied Underwriters
- Assurant
- CNA
- Countryway
- Cumberland Mutual
- Encompass
- Fireman's Fund
- Foremost
- Franklin Mut.
- G&G Undwrs.
- Great American
- Greater NY Mut.
- Guard
- Hartford
- Liberty Mutual
- Magna Carta
- Mercer
- Merchants Insurance Group
- Mercury
- MetLife
- Narragansett Bay
- Nationwide
- Norfolk & Dedham
- Ohio Casualty
- Peerless
- Philadelphia
- Plymouth Rock Assurance
- Preserver
- Progressive
- RLI Corp.
- Safeco
- Selective
- The Philadelphia Contributionship
- Travelers
- United Fire Group
- Utica National Insurance Group
- Windsor-Mount Joy Mutual
- Zenith
- Zurich