- Auto-Owners
- Berkshire Hathaway
- Celina Insurance Group
- EMC
- Encova
- Grinnell Mutual
- Hagerty
- Hawkeye Mut.
- IMT Insurance
- Louisa Mutual
- Markel
- MetLife
- Nationwide
- Prairie Mut.
- Progressive
- United Fire Group
- Wellmark Blue Cross Blue Shield
- West Bend
- Westfield Insurance