| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Caber Oil Ltd | SC049154 | 27/02/1995 | Dissolved |
| Macmillan Natural Resources Ltd | 01010995 | 17/12/1992 | Dissolved |
| PREMIER PENSION PLAN TRUSTEE LIMITED | 02841657 | 06/04/2007 | Not Trading |
| Pict Petroleum (Tunisia) Limited | SC141224 | 27/02/1995 | Dissolved |
| Premier Oil Halmahera Ltd | 00560601 | 17/12/1992 | Dissolved |
| VOSTOK ENERGY PUBLIC LIMITED COMPANY | 05806076 | 26/05/2006 | Dissolved |
| VOSTOK ENERGY RESOURCES LIMITED | 06000942 | 28/04/2011 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AFREN PLC | 05304498 | 25/07/2005 | 01/11/2006 | Dissolved |
| AL HAJ PAKISTAN EXPLORATION LIMITED | 01164960 | 30/10/1992 | 18/02/2000 | Bronze |
| HARBOUR ENERGY PLC | SC234781 | 13/09/2002 | 30/06/2005 | Silver |
| MAGHREB OFFSHORE LIMITED | 01057332 | 17/12/1992 | 30/06/2005 | Dissolved |
| PREMCO PETROLEUM (OIL AND GAS) LIMITED | 00868620 | 17/12/1992 | 30/06/2005 | Dissolved |
| PREMIER ENERGY ENTERPRISES LIMITED | 01164959 | 17/12/1992 | 30/06/2005 | Dissolved |
| PREMIER OIL (EBURY GATE) LIMITED | 03682706 | 16/12/1998 | 30/06/2005 | Dissolved |
| PREMIER OIL (MIDDLE EAST) LTD | 04222801 | 19/07/2001 | 30/06/2005 | Dissolved |
| PREMIER OIL (NW NATUNA) LIMITED | 00963192 | 17/12/1993 | 30/06/2005 | Dissolved |
| PREMIER OIL ABERDEEN SERVICES LIMITED | 01164961 | 17/12/1992 | 30/06/2005 | Bronze |
| PREMIER OIL AND GAS SERVICES LIMITED | 03468792 | 19/12/1997 | 30/06/2005 | Gold |
| PREMIER OIL EXPLORATION LIMITED | SC021265 | 27/04/1990 | 30/06/2005 | Amber |
| PREMIER OIL FAR EAST LIMITED | 01135444 | 17/12/1992 | 30/06/2005 | Gold |
| PREMIER OIL GROUP LIMITED | SC017829 | 07/08/1990 | 30/06/2005 | Gold |
| PREMIER OIL HOLDINGS LIMITED | 03689620 | 08/03/1999 | 30/06/2005 | Amber |
| PREMIER OIL SOUTH ANDAMAN LIMITED | 01474678 | 17/12/1991 | 30/06/2005 | Amber |
| PREMIER OIL UK LIMITED | SC048705 | 13/02/1995 | 30/06/2005 | Silver |
| PREMIER OVERSEAS HOLDINGS LIMITED | 03689626 | 08/03/1999 | 30/06/2005 | Dissolved |
| Parambe Oil & Gas Operations Ltd | 01121594 | 17/12/1992 | 30/06/2005 | Dissolved |
| Premier Oil Albania (Holdings) Ltd | 03664109 | 20/11/1998 | 30/06/2005 | Dissolved |
| Premier Oil Dorset Ltd | 01165601 | 07/08/1991 | 30/06/2005 | Dissolved |
| Premier Oil Gabon Ltd | 04718829 | 22/05/2003 | 30/06/2005 | Dissolved |
| Premier Oil Pangkah Ltd | 01012762 | 17/12/1992 | 30/06/2005 | Dissolved |
| Rocky Mountains Oil & Gas Ltd | 01505884 | 30/10/1992 | 30/06/2005 | Dissolved |
| SALAMANDER ENERGY GROUP LIMITED | 05321519 | 01/06/2005 | 27/06/2007 | Gold |
| SALAMANDER ENERGY LIMITED | 05934263 | 09/11/2006 | 02/03/2015 | Bronze |
| SOA ENERGY UK LIMITED | 09285856 | 19/12/2016 | 29/03/2019 | Dissolved |