| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ATRIUM CAPITAL LIMITED | 02959679 | 21/08/2000 | Dissolved |
| ATRIUM COCKELL GROUP LIMITED | 03044367 | 01/08/1997 | Dissolved |
| ATRIUM SERVICES LIMITED | 02983890 | 01/08/2000 | Dissolved |
| Atrium Management Services Ltd | 03063061 | 03/06/2005 | Dissolved |
| NEWCOCKELL LIMITED | 03250907 | 01/08/2000 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ATRIUM 5 LIMITED | 02861145 | 02/12/1998 | 01/07/2014 | Gold |
| ATRIUM GROUP SERVICES LIMITED | 06022662 | 07/12/2006 | 01/07/2014 | Silver |
| ATRIUM INSURANCE AGENCY LIMITED | 05993519 | 09/11/2006 | 01/01/2016 | Gold |
| ATRIUM UNDERWRITERS LIMITED | 01958863 | 01/08/1997 | 31/12/2020 | Gold |
| ATRIUM UNDERWRITING GROUP LIMITED | 02860390 | 01/01/2000 | 31/12/2020 | Silver |
| ATRIUM UNDERWRITING HOLDINGS LIMITED | 02861307 | 02/12/1998 | 01/07/2014 | Dissolved |
| GRACECHURCH UTG NO. 383 LIMITED | 02861129 | 02/12/1998 | 01/07/2014 | Dissolved |
| GRACECHURCH UTG NO. 384 LIMITED | 02861131 | 02/12/1998 | 30/09/2007 | Dissolved |
| GRACECHURCH UTG NO. 385 LIMITED | 02861134 | 02/12/1998 | 01/07/2014 | Strike Off |
| GRACECHURCH UTG NO. 386 LIMITED | 02861143 | 02/12/1998 | 01/07/2014 | Strike Off |
| GRACECHURCH UTG NO. 387 LIMITED | 03411497 | 02/12/1998 | 01/07/2014 | Dissolved |
| GRACECHURCH UTG NO. 388 LIMITED | 03411536 | 02/12/1998 | 01/07/2014 | Dissolved |
| GRACECHURCH UTG NO. 389 LIMITED | 03411529 | 02/12/1998 | 01/07/2014 | Dissolved |
| GRACECHURCH UTG NO. 390 LIMITED | 03411534 | 02/12/1998 | 01/07/2014 | Dissolved |
| GRACECHURCH UTG NO. 391 LIMITED | 03411528 | 02/12/1998 | 01/07/2014 | Dissolved |
| GRACECHURCH UTG NO. 392 LIMITED | 02966649 | 21/08/2000 | 01/07/2014 | Dissolved |
| NOMINA NO 207 LLP | OC323523 | 27/10/2006 | 01/01/2018 | Bronze |