- Aegis
- American Collectors Insurance
- American Modern Insurance Group
- American Strategic Insurance
- AmTrust
- Argo Group
- Berkley Mid-Atlantic Group
- Berkshire Hathaway
- Berkshire Hathaway GUARD
- Bristol West
- Chubb
- CNA
- Dairyland
- Donegal
- EMC
- Encompass
- Encova
- Farmers Fire Insurance Company
- FirstComp
- Foremost
- Grundy Worldwide
- Hagerty
- Harford Mut.
- Hartford
- iSurity
- Keystone
- Lackawanna Cas.
- Lititz Mutual
- Lloyd's
- Markel
- Millville
- Nationwide
- Ohio Casualty
- Peerless
- Penn Natl.
- Pennsylvania Lumbermens Mutual
- Philadelphia
- Progressive
- QBE
- RLI Corp.
- Safeco
- Selective
- Synergy Comp
- The Philadelphia Contributionship
- Travelers
- United Fire Group
- VFIS
- Westfield Insurance
- Zenith