| American Mutual Insurance Company Of Boston | Jan 17, 1989 |
| American Mutual Liability Insurance Company | Jan 17, 1989 |
| Atlantic Mutual Insurance Company | Apr 27, 2011 |
| Bakers Mutual Insurance Company | Aug 10, 1978 |
| Carriers Insurance Company | Jan 16, 1986 |
| Casualty Reciprocal Exchange | Aug 18, 2004 |
| Centennial Insurance Company | Apr 27, 2011 |
| Commercial Compensation Insurance In Liq | Sep 26, 2000 |
| Consolidated Mutual Inc. Company | Nov 13, 1978 |
| Cosmopolitan Mutual Insurance Company | Aug 05, 1980 |
| Credit General Insurance Company | Jan 05, 2001 |
| Employer's National Insurance Company | Jan 06, 1994 |
| Equity Mutual Insurance Company | Aug 18, 2004 |
| Fremont Indemnity Company | Jul 02, 2003 |
| Ideal Mutual Insurance Company | Dec 26, 1984 |
| Imperial Casualty and Indemnity Company | Oct 31, 1995 |
| Imperial Insurance Company | Jan 10, 1978 |
| Legion Indemnity Company | Apr 09, 2003 |
| Legion Insurance Company | Jul 25, 2003 |
| LMI Insurance Company | May 22, 2000 |
| Mastercare | Jul 14, 2003 |
| Midland Insurance Company | Apr 03, 1986 |
| Newark Insurance Company | Aug 09, 2007 |
| Phico Insurance Company In Liquidation | Feb 01, 2002 |
| Reinsurance Company of America, Inc | Apr 27, 2011 |
| Reliance Insurance Company | Oct 03, 2001 |
| Shelby Worker's Comp | Aug 24, 2006 |
| State Capital Insurance Company | Jun 21, 2004 |
| The Home Insurance Company In Liquidation | Jun 13, 2003 |
| Transit Casualty Insurance Company In Receivership | Dec 20, 1985 |
| Villanova Insurance Company | Jul 25, 2003 |
| Warwick Insurance Company | Jun 22, 1993 |
| Western Employers Insurance Company | Apr 19, 1991 |
| Western Employers Workers Comp | Apr 19, 1991 |