- Allianz
- Chubb
- Cincinnati Casualty Company
- ClearPath
- CNA
- CNA Surety
- Fireman's Fund
- Foremost
- Great American
- KEMI
- Lexington
- Liberty Mutual
- Nationwide
- Ohio Casualty
- Ohio FAIR Plan
- Philadelphia
- Progressive
- Travelers
- Westfield Insurance
- Jay V. Wittenbaum, Partner
- Bill E. Katz, Partner
- Fred H. Wittenbaum, Partner
- Brad G. Wittenbaum