- ACE-USA (formerly CIGNA Property & Casualty)
- American-Interstate Insurance Company
- American Safety Insurance Services
- American Subcontractors Association of Oklahoma
- Antenna Vision, Argonaut Great Central Insurance Company
- BancFirst
- Browning-Ferris Industries
- Central Plastics, Central States Thermo-King
- Citizen Potawatomi Nation
- The City of Lawton
- C.L. Frates and Company
- Claim Indemnity Service
- Claims and Risk Services
- Coldwell Banker Real Estate Management Services, Inc.
- Consolidated Benefits Resources
- CompSource Oklahoma
- Cox Cable of OKC
- Crawford & Company
- Crawley Petroleum Corporation
- Cunningham Lindsey Claims Management
- EBI Companies
- El Paso Production Company
- Empire Electric Company
- Employers Mutual Companies
- EPS, Employers Claims Adjustment Services
- Georgia Pacific
- The Gray Insurance. Co.
- Haskell Lemon Construction Company
- Homeland Stores, Inc.
- Hobby Lobby Stores, Inc.
- Integris Health
- Kemper Insurance Companies
- Marathon Oil Company
- Oklahoma Aggregate Association
- Oklahoma Gas and Electric
- Oklahoma Lumbermen’s Association
- Mid-Continent Casualty Company
- Multimedia Security
- Mustang Fuel Corp.
- Mutual Assurance Administrators
- National, Security Fire and Casualty
- Oklahoma Cable and Telecommunications Association
- Oklahoma County
- Oklahoma Grocers Association
- Oklahoma Municipal Power Authority
- Oklahoma Restaurant Group
- O’Reilly Auto Parts
- Orasure
- Oscar J. Boldt Construction Company
- Putnam City Schools; R.L. Polk and Co.
- Republic Insurance Group
- Remedy Staffing, Risk Enterprise Management, LTD
- Rocor International
- Saint Anthony’s Hospital
- Sedgwick James Co.
- Spartan Aviation Industries
- Stephens Production Company
- St. Paul Fire & Marine Insurance Company
- Travelers Insurance Company
- Oklahoma Municipal Assurance Group
- 7-Eleven Stores, Inc.
- Union Standard Insurance Company
- Unit Parts Company
- W. H. Braum, Inc.
- Universal Underwriters Insurance Company
- Yellow Freight System, Inc.
- Zenith Insurance Company
- Zurich-American Insurance Group
- Zurich Direct Markets and Zurich North America