| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| GTO LIMITED | 04751046 | 01/09/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| A.C.M.T. LIMITED | 04189328 | 11/04/2001 | 05/04/2017 | Gold |
| AFENTRA PLC | 01757721 | 15/11/2010 | 13/10/2016 | Bronze |
| AURELIAN OIL & GAS LIMITED | 01685863 | 28/04/2003 | 29/09/2010 | One Red Flag |
| Berkeley Exploration & Production Plc | 01448241 | 28/04/2000 | 04/12/2000 | Dissolved |
| Bhp Petroleum North Sea Ltd | 01463351 | 01/11/1994 | 01/12/1995 | Dissolved |
| CNR INTERNATIONAL (U.K.) DEVELOPMENTS LIMITED | 01021629 | 17/02/1997 | 04/12/2000 | Amber |
| CNR INTERNATIONAL (U.K.) INVESTMENTS LIMITED | 01293529 | 21/02/1996 | 04/12/2000 | Silver |
| CNR INTERNATIONAL (U.K.) LIMITED | 00813187 | 21/02/1996 | 04/12/2000 | Bronze |
| Clinton International North Sea Ltd | 00995617 | 01/07/1994 | 01/12/1995 | Dissolved |
| FIRST OIL PLC | SC191745 | 01/08/2005 | 24/10/2005 | Dissolved |
| GESGB CONFERENCES LIMITED | 02649148 | 22/12/1992 | 13/06/1995 | Bronze |
| GESGB CONFERENCES LIMITED | 02649148 | 22/12/1992 | 13/06/1995 | Bronze |
| Petroleum Geology '86 Ltd | 01902449 | 18/05/1993 | 12/01/1995 | Dissolved |
| Ranger Oil (France) Ltd | FC020457 | 09/07/1997 | 04/12/2000 | Dissolved |