| Healthcare Providers Insurance Exchange | PA | 08/06/2021 |
| Lincoln General Insurance Company | PA | 10/19/2018 |
| Castlepoint National Insurance Company | CA | 12/31/2017 |
| Regis Insurance Company | PA | 06/27/2016 |
| Reliance Insurance Company | PA | 03/31/2016 |
| Villanova Insurance Company | PA | 04/30/2015 |
| Legion Insurance Company | PA | 04/30/2015 |
| Freestone Insurance Company | DE | 12/31/2015 |
| Gramercy Insurance Company | TX | 02/26/2015 |
| Atlantic Mutual Insurance Company | NY | 01/16/2015 |
| Centennial Insurance Company | NY | 01/16/2015 |
| Lumbermens Mutual Casualty Company | IL | 11/10/2014 |
| Ullico Casualty Company | DE | 06/30/2014 |
| Frontier Insurance Company | NY | 12/31/2014 |
| Insurance Corporation of New York | NY | 12/31/2012 |
| MIIX Insurance Company | NJ | 04/11/2011 |
| Rockwood Insurance Company | PA | 09/24/2010 |
| Union Indemnity Insurance Company of New York | NY | 07/19/2010 |
| Newark Insurance Company | NJ | 09/28/2009 |
| PHICO Insurance Company | PA | 07/31/2009 |
| Vesta Fire Insurance Corporation | TX | 11/30/2007 |
| Shelby Casualty Insurance Company | TX | 11/30/2007 |
| Shelby Insurance Company | TX | 11/30/2007 |
| State Capital Insurance Company | NC | 06/30/2006 |
| United Community Insurance Company | NY | 11/15/2004 |
| Reciprocal of America | VA | 09/30/2004 |
| The Home Insurance Company | NH | 06/13/2004 |
| White Hall Mutual Insurance Company | PA | 04/10/2004 |
| Ideal Mutual Insurance Company | NY | 12/31/2003 |
| American Horizon Insurance Company | IL | 07/11/2003 |
| Premier Insurance Company | PA | 08/31/2001 |
| Hamilton Insurance Company | PA | 08/03/2001 |
| LMI Insurance Company | OH | 05/23/2001 |
| P.I.E. Mutual Insurance Company | OH | 09/23/1999 |
| P.I.C. Insurance Group | PA | 01/21/1999 |
