- Accident Fund Insurance Company
- American Hallmark
- American Modern Insurance Group
- Arkansas Mutual
- Berkshire Hathaway
- BITCO Insurance Companies
- Blue Cross Blue Shield
- Chubb
- Cincinnati Insurance Companies
- CNA
- Colonial Life
- FCCI
- Foremost
- Hanover
- Hartford
- Kansas City Life
- Liberty Mutual
- Lincoln Financial Group
- Mercy Health Plans
- MetLife
- National American Ins.
- Principal
- ProAssurance
- Progressive
- QualChoice
- Safeco
- State Auto
- Summit
- Sun Life Financial
- TASC
- Travelers
- Union Std.
- United Fire Group
- United Healthcare
- Unum
- Westfield Insurance
- Zurich