- ACE
- Acuity
- Aetna
- Affiliated FM
- Allied
- American International Group
- American Interstate
- Anthem Blue Cross Blue Shield
- Assurant Employee Benefits
- Bar Plan
- Bituminous Insurance Companies
- Blue Cross/Blue Shield of Illinois
- Capitol Indemnity
- Chubb
- CIGNA Healthcare
- CNA
- Continental Western
- Delta Dental
- Electric
- Encompass
- Fireman's Fund
- Genworth Financial
- Great American
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- Great West Casualty
- Group Health Plan
- Guardian Life Insurance Company of America
- Hartford
- Hartford Steam Boile
- Hawkeye-Security
- Humana
- International Fidelity
- Kansas City Life
- Lafayette Life
- Lancer
- Lincoln Financial
- Medical Protective
- Medmare Casualty
- Mercy Health Plan
- Metropolitan Life
- Midwest Employers Casualty
- Missouri Employers Mutual
- Mutual of Omaha
- National Interstate
- Navigators
- North American Life Insurance
- OneBeacon
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- Pacific Life
- Pennsylvania Lumbermens
- Philadelphia Insurance
- Principal Financial Company
- Progressive
- Prudential
- Reliance Standard
- Safeco
- Secura
- Sentry
- State Auto
- Standard Insurance
- Tokio Fire & Marine
- Travelers
- Trustmark
- Unicare
- United Healthcare
- UNUM Provident
- Vanliner
- Wausau
- XL Insurance
- Zenith Insurance
- Zurich U.S.
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