| Acceleration National Insurance Co. |
| Affirmative Insurance Company |
| Agricultural Insurance Company |
| All America Insurance Company |
| American Alliance Insurance Company |
| American Empire Insurance Company |
| American Family Insurance Company |
| American Fire & Casualty Company |
| American Hardware Mutual Insurance Co. |
| American Merchants Casualty Co. |
| American Modern Home Insurance Co. |
| American Mutual Share Insurance Corp. |
| American Select Insurance Company |
| American Standard Insurance Co. of Ohio |
| Atlanta Casualty Company |
| Atlanta Reserve Insurance Company |
| Atlanta Specialty Insurance Company |
| BCS Insurance Company |
| Beacon Insurance Co. of America |
| Buckeye State Mutual Insurance Company |
| Buckeye Union Insurance Company |
| Celina Mutual Insurance Company |
| Central Mutual Insurance Company |
| Century Surety Company |
| Cigna Insurance Company of Ohio |
| Cincinnati Casualty Company |
| Cincinnati Equitable Insurance Company |
| Cincinnati Indemnity Company |
| Cincinnati Insurance Company |
| Citizens Insurance Company of Ohio |
| Club Insurance Company |
| Community Insurance Company |
| Continental Heritage Insurance Company |
| Continental National Indemnity Company |
| Coventry Insurance Company |
| Credit General Indemnity Company |
| Credit General Insurance Company |
| Crum & Forster Underwriting Co. of Ohio |
| Dealers Assurance Company |
| Eagle American Insurance Company |
| Elevators Mutual Insurance Company |
| Evergreen National Indemnity Company |
| Excess Share Insurance Corp. |
| Farmers Insurance of Columbus, Inc. |
| Fidelity Excess & Surplus Ins. Co. |
| Fireman's Fund Insurance Co. of Ohio |
| Front Royal Insurance Company |
| General Star National Insurance Company |
| German Mutual Insurance Company |
| Globe American Casualty Company |
| Grange Guardian Insurance Company |
| Grange Mutual Casualty Company |
| Great American Insurance Company |
| Great Lakes Protective Assn. |
| Great Oaks Insurance Company |
| Halcyon Insurance Company |
| Hamilton Mutual Insurance Co. of Cincinnati |
| Insura Property & Casualty Ins. Company, Inc. |
| Insurance Company of Ohio |
| JC Penney Casualty Insurance Company |
| Leader Insurance Company |
| Leader Preferred Insurance Company |
| Lightning Rod Mutual Insurance Company |
| LMI Insurance Company |
| Medical Mutual of Ohio |
| Mennonite Mutual Insurance Company |
| Miami Mutual Insurance Company |
| MICO Insurance Company |
| Mid-American Fire and Casualty Company |
| Midwest Employers Casualty Company |
| Midwestern Indemnity Company |
| Motorists Mutual Insurance Company |
| National Interstate Insurance Company |
| National Mutual Insurance Company |
| Nationwide General Insurance Company |
| Nationwide Indemnity Company |
| Nationwide Mutual Insurance Company |
| Nationwide Property and Casualty Co. |
| OHIC Insurance Company |
| Ohio Bar Liability Insurance Company |
| Ohio Casualty Insurance Company |
| Ohio Casualty of New Jersey, Inc. |
| Ohio Farmers Insurance Company |
| Ohio Indemnity Company |
| Ohio Security Insurance Company |
| Owners Insurance Company |
| Permanent General Assurance |
| Personal Service Insurance Company |
| Physicians Insurance Company of Ohio |
| Pioneer Insurance Company |
| Plans Liability Insurance Company |
| Primetime Medical Insurance Company |
| Professionals Insurance Company |
| Progressive Casualty Insurance Company |
| Progressive Max Insurance Company |
| Progressive Preferred Insurance Company |
| Progressive Specialty Insurance Company |
| Proliance Insurance Company |
| Qualchoice Health Plan, Inc. |
| Republic Mutual Insurance Company |
| Republic-Franklin Insurance Company |
| Safe Auto Insurance Company |
| Scottsdale Indemnity Company |
| Scottsdale Insurance Company |
| Service General Insurance Company |
| Shelby Insurance Company |
| Sonenberg Insurance Company |
| Stanford Insurance Company |
| State Auto Mutual Insurance Company |
| State Auto National Insurance Company |
| Summa Insurance Company, Inc. |
| TICO Insurance Company |
| Transport Insurance Company |
| United Ohio Insurance Company |
| Victoria Fire and Casualty Company |
| Victoria National Insurance Company |
| Victoria Select Insurance Company |
| Victoria Specialty Insurance Company |
| Wayne Mutual Insurance Company |
| Western Reserve Mutual Casualty Company |
| Westfield Insurance Company |
| Westfield National Insurance Company |
| Worldwide Insurance Company |