| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Intercash World Ltd | 03782916 | 04/06/1999 | Dissolved |
| Winham Services Ltd | 04711942 | 26/03/2003 | Dissolved |
| Winham Services Ltd | 04711942 | 26/03/2003 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AL HAJ PAKISTAN EXPLORATION LIMITED | 01164960 | 03/08/1994 | 10/03/1995 | Bronze |
| CORO EUROPE LIMITED | 05811564 | 13/10/2006 | 30/11/2012 | One Red Flag |
| Critical Data Ltd | 04323659 | 16/11/2001 | 09/09/2003 | Dissolved |
| FINA PETROLEUM DEVELOPMENT LIMITED | 00740632 | 31/12/1991 | 22/05/1992 | Gold |
| MAGHREB OFFSHORE LIMITED | 01057332 | 03/08/1994 | 10/03/1995 | Dissolved |
| Macmillan Natural Resources Ltd | 01010995 | 03/08/1994 | 10/03/1995 | Dissolved |
| PREMCO PETROLEUM (OIL AND GAS) LIMITED | 00868620 | 03/08/1994 | 10/03/1995 | Dissolved |
| PREMIER ENERGY ENTERPRISES LIMITED | 01164959 | 03/08/1994 | 10/03/1995 | Dissolved |
| PREMIER OIL (NW NATUNA) LIMITED | 00963192 | 03/08/1994 | 10/03/1995 | Dissolved |
| PREMIER OIL ABERDEEN SERVICES LIMITED | 01164961 | 03/08/1994 | 10/03/1995 | Bronze |
| PREMIER OIL EXPLORATION LIMITED | SC021265 | 03/08/1994 | 10/03/1995 | Amber |
| PREMIER OIL FAR EAST LIMITED | 01135444 | 03/08/1994 | 10/03/1995 | Gold |
| PREMIER OIL GROUP LIMITED | SC017829 | 22/05/1992 | 10/03/1995 | Gold |
| PREMIER OIL SOUTH ANDAMAN LIMITED | 01474678 | 03/08/1994 | 10/03/1995 | Amber |
| PREMIER OIL UK LIMITED | SC048705 | 13/02/1995 | 10/03/1995 | Silver |
| Parambe Oil & Gas Operations Ltd | 01121594 | 03/08/1994 | 10/03/1995 | Dissolved |
| Premier Oil Dorset Ltd | 01165601 | 03/08/1994 | 10/03/1995 | Dissolved |
| Premier Oil Halmahera Ltd | 00560601 | 03/08/1994 | 10/03/1995 | Dissolved |
| Premier Oil Pangkah Ltd | 01012762 | 03/08/1994 | 10/03/1995 | Dissolved |
| Rocky Mountains Oil & Gas Ltd | 01505884 | 03/08/1994 | 10/03/1995 | Dissolved |
| SOUND ENERGY PLC | 05344804 | 04/04/2005 | 10/10/2012 | Silver |