- Aenta
- Agrilogic
- American Collectors
- American Livestock, Inc.
- AmTrust North America
- Auto-Owners Insurance Company
- Blue Cross Blue Shield of Illinois
- Coventry
- Delta Dental
- Foremost
- Frontier Mutual Insurance Company
- General Casualty
- Grinnell Mutual Reinsurance Company
- Hanover
- Humana
- Illinois Public Risk Fund
- Land of Lincoln
- Markel Insurance Company
- MetLife
- Old Republic Surety
- Principal Financial Group
- Progressive Insurance Company
- Protective Life Insurance Company
- RLI Surety Company
- Safeco
- Society Insurance Company
- Travelers
- United Healthcare of River Valley
- United Health Care
- U.S. Insurance Company of America
- West Bend Mutual Insurance Company
- Health Alliance
