| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Bonadark Ltd | 02275654 | 13/04/2005 | Dissolved |
| EXCALIBUR EXPLORATION LIMITED | 03059175 | 25/11/2010 | Dissolved |
| Opengreen Limited | 02439324 | 02/11/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AFENTRA PLC | 01757721 | 19/01/2007 | 31/12/2010 | Bronze |
| ARKEX LIMITED | 04255000 | 23/01/2004 | 04/08/2005 | Dissolved |
| BLOOMSBURY DSP LTD | 05132949 | 12/04/2005 | 18/03/2011 | Dissolved |
| Brookfield Mansions Ltd | 04138226 | 10/01/2001 | 10/12/2003 | Dissolved |
| ENCORE OIL LIMITED | 03328217 | 11/04/2005 | 03/03/2006 | Gold |
| MONTROSE PETROLEUM LIMITED | 03246635 | 16/09/1996 | 01/09/2002 | Dissolved |
| Medusa Petroleum Ltd | 03307038 | 27/01/1997 | 20/01/1998 | Dissolved |
| REPSOL NORTH SEA LIMITED | 01061863 | 25/05/1992 | 23/01/1996 | Silver |
| REPSOL OIL TRADING LIMITED | 02307374 | 19/10/1992 | 23/01/1996 | Amber |
| SERICA ENERGY (UK) LIMITED | 04073712 | 29/04/2002 | 13/02/2004 | Silver |
| STERLING OIL LIMITED | 03970813 | 27/07/2000 | 07/01/2004 | Dissolved |
| SWITCHBOARD LGBT + | 02098685 | 13/10/2002 | 23/10/2005 | Silver |
| TRAJAN OIL & GAS LIMITED | 07217669 | 10/12/2010 | 26/02/2019 | Dissolved |
| TRANSWORLD PETROLEUM (U.K.) LIMITED | 01010787 | 29/05/1992 | 23/01/1996 | Amber |