| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Atlantex Music Ltd | 01361534 | 31/12/1991 | Dissolved |
| Atlantex Music Ltd | 01361534 | 31/12/1991 | Dissolved |
| CROSSCO (1219) LIMITED | 07441375 | 08/02/2011 | Dissolved |
| CROSSCO (1341) LIMITED | 08717270 | 22/10/2013 | Gold |
| Entel Ltd | 02586990 | 11/03/1994 | Dissolved |
| Harman Loudspeakers Ltd | 01930498 | 31/12/1990 | Dissolved |
| Harman Loudspeakers Ltd | 01930498 | 31/12/1990 | Dissolved |
| Mbi Consulting and Commissioning Ltd | 02178502 | 30/07/1991 | Dissolved |
| Parisol 2011 Ltd | 03570313 | 01/08/2001 | Dissolved |
| Riverend Ltd | 01341496 | 31/12/1990 | Dissolved |
| Riverend Ltd | 01341496 | 31/12/1990 | Dissolved |
| THE CARBIS BEACH APARTMENTS MANAGEMENT COMPANY LIMITED | 03955670 | 11/04/2013 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Bandive | 01341235 | 31/12/1990 | 30/06/1993 | Dissolved |
| Bandive | 01341235 | 31/12/1990 | 25/03/1996 | Dissolved |
| C-AUDIO LIMITED | 06708445 | 15/10/2008 | 25/07/2012 | Dissolved |
| CROSSCO (1222) LIMITED | 07489246 | 04/10/2012 | 28/05/2015 | Dissolved |
| Gatehit Ltd | 02352838 | 06/04/1994 | 16/02/1998 | Dissolved |
| HARMAN INTERNATIONAL INDUSTRIES LIMITED | 01485558 | 31/12/1990 | 01/04/2001 | Gold |
| HARMAN UK LIMITED | 02123223 | 31/12/1990 | 01/04/2001 | Dissolved |
| Harman Number Eleven | 01558651 | 05/10/1995 | 22/03/1996 | Dissolved |
| Harman Number Fifteen | 01132171 | 15/12/1991 | 20/03/1996 | Dissolved |
| Harman Number Fourteen | 00808367 | 29/12/1991 | 20/03/1996 | Dissolved |
| Harman Number Nine Ltd | 01239921 | 23/09/1998 | 24/09/1998 | Dissolved |
| Harman Number One | 01703753 | 30/06/1995 | 25/03/1996 | Dissolved |
| Harman Number Six Ltd | 03178971 | 30/09/1998 | 01/04/2001 | Dissolved |
| Harman Number Sixteen | 02604875 | 31/10/1994 | 21/03/1996 | Dissolved |
| Harman Number Ten | 01623718 | 30/06/1995 | 25/03/1996 | Dissolved |
| Harman Number Twelve | 01651597 | 30/06/1995 | 25/03/1996 | Dissolved |
| MARTIN AUDIO LIMITED | 04824341 | 29/06/2018 | 30/12/2019 | Silver |
| OPTIMAL AUDIO GROUP LIMITED | 11341979 | 27/06/2018 | 30/12/2019 | One Red Flag |
| Setford Ltd | 02336963 | 06/04/1994 | 16/02/1998 | Dissolved |
| Studer U K Ltd | 03966495 | 06/07/2000 | 30/06/2001 | Dissolved |
| TURBOSOUND LTD | 05998934 | 19/02/2007 | 01/07/2008 | Dissolved |
| Total Audio Concepts Ltd | 01459089 | 06/04/1994 | 16/02/1998 | Dissolved |