The Rigg Darlington Group
- Capital Blue Cross
- Chubb
- Cincinnati Insurance Companies
- Donegal
- Eastern Alliance
- Health America
- Highmark Blue Shield
- HM Ins. Grp.
- Independence Blue Cross
- Liberty Mutual
- Penn Natl.
- Philadelphia
- Progressive
- Travelers
- United Concordia
- United Healthcare
- Westfield Insurance
- Windsor-Mount Joy Mutual
- Jeffrey Darlington, Partner