| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| DERITEND ELECTRO-MECHANICAL SERVICES LIMITED | 04159270 | 21/02/2001 | Dissolved |
| DERITEND INDUCTION SERVICES LIMITED | 04145430 | 16/02/2001 | Dissolved |
| DERITEND LIMITED | 04140330 | 16/02/2001 | Dissolved |
| DERITEND MAINTENANCE LIMITED | 04140309 | 16/02/2001 | Dissolved |
| DERITEND MAINTENANCE SERVICES LIMITED | 04159274 | 21/02/2001 | Dissolved |
| Deritend Aviation Windings Ltd | 04149845 | 16/02/2001 | Dissolved |
| Gw 3107 Ltd | 04869281 | 24/11/2003 | Dissolved |
| Gw 3117 Ltd | 05394509 | 18/07/2005 | Dissolved |
| HALE GROUP LTD | 05394932 | 18/07/2005 | Silver |
| R.M.B. (TEESSIDE) LIMITED | 02576112 | 08/05/2007 | Dissolved |
| R.M.B. ENGINEERING SERVICES LIMITED | 01893455 | 08/05/2007 | Dissolved |
| RH HOLDINGS GROUP LIMITED | 10570489 | 14/02/2017 | Silver |
| SERCHEM HOLDINGS LIMITED | 14091996 | 13/10/2022 | Bronze |
| SERCHEM LIMITED | 01554016 | 13/10/2022 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AVIATION WINDINGS LIMITED | 05394513 | 18/07/2005 | 25/08/2005 | Dissolved |
| PFW REALISATIONS LIMITED | 07462547 | 01/04/2011 | 04/07/2014 | Dissolved |
| TDGL 1 LIMITED | 10556204 | 10/02/2017 | 16/09/2021 | Silver |
| TDGL 2 LIMITED | 09667937 | 01/08/2015 | 16/09/2021 | Bronze |
| THE DERITEND GROUP LIMITED | 04140677 | 16/02/2001 | 16/09/2021 | One Red Flag |