| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Image Automation Ltd | 01902336 | 14/05/2001 | Dissolved |
| S & L Installations Ltd | 06011522 | 28/11/2006 | Dissolved |
| Sira Associates Ltd. | 02540284 | 14/03/2003 | Dissolved |
| Sira Communications Ltd | 02423360 | 14/03/2003 | Dissolved |
| Sira Consulting Ltd | 01600723 | 14/03/2003 | Dissolved |
| Sira Group Ltd | 03444757 | 06/01/1998 | Dissolved |
| Sira Holdings Ltd | 04786195 | 04/06/2003 | Dissolved |
| Sira Innovation Ltd | 02287839 | 14/03/2003 | Dissolved |
| Sira Ltd | 00150576 | 10/09/2001 | Dissolved |
| Sira Technology Ltd | 02248869 | 06/01/1998 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Michelson Diagnostics Technology Ltd | 05478714 | 13/06/2005 | 18/05/2006 | Dissolved |
| SIRA CERTIFICATION SERVICE LIMITED | 02266287 | 23/10/2003 | 29/09/2005 | Dissolved |
| SIRA DEFENCE & SECURITY LIMITED | 05589861 | 12/10/2005 | 28/03/2006 | Dissolved |