| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Macmillan Natural Resources Ltd | 01010995 | 30/04/1999 | Dissolved |
| Premier Oil Halmahera Ltd | 00560601 | 30/04/1999 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AL HAJ PAKISTAN EXPLORATION LIMITED | 01164960 | 01/02/2003 | 30/06/2005 | Bronze |
| FIRST CALGARY PETROLEUMS UK LTD | 06084322 | 06/02/2007 | 12/12/2007 | Dissolved |
| FIRST CALGARY PETROLEUMS UK LTD | 06084322 | 06/02/2007 | 12/12/2007 | Dissolved |
| GROVE ENERGY (ROMANIA) LIMITED | 05969643 | 10/07/2008 | 05/11/2010 | Dissolved |
| GROVE ENERGY (SOUTHERN NORTH SEA) LIMITED | 05947276 | 10/07/2008 | 05/11/2010 | Dissolved |
| HARBOUR ENERGY PLC | SC234781 | 13/09/2002 | 30/06/2005 | Silver |
| MAGHREB OFFSHORE LIMITED | 01057332 | 30/04/1999 | 30/06/2005 | Dissolved |
| PRAX UPSTREAM LIMITED | 05245689 | 08/03/2013 | 29/06/2021 | Bronze |
| PREMCO PETROLEUM (OIL AND GAS) LIMITED | 00868620 | 30/04/1999 | 30/06/2005 | Dissolved |
| PREMIER ENERGY ENTERPRISES LIMITED | 01164959 | 30/04/1999 | 30/06/2005 | Dissolved |
| PREMIER OIL (EBURY GATE) LIMITED | 03682706 | 27/04/1999 | 30/06/2005 | Dissolved |
| PREMIER OIL (MIDDLE EAST) LTD | 04222801 | 19/07/2001 | 30/06/2005 | Dissolved |
| PREMIER OIL (NW NATUNA) LIMITED | 00963192 | 30/04/1999 | 30/06/2005 | Dissolved |
| PREMIER OIL ABERDEEN SERVICES LIMITED | 01164961 | 30/04/1999 | 30/06/2005 | Bronze |
| PREMIER OIL AND GAS SERVICES LIMITED | 03468792 | 30/04/1999 | 30/06/2005 | Gold |
| PREMIER OIL EXPLORATION LIMITED | SC021265 | 30/04/1999 | 30/06/2005 | Amber |
| PREMIER OIL FAR EAST LIMITED | 01135444 | 30/04/1999 | 30/06/2005 | Gold |
| PREMIER OIL GROUP LIMITED | SC017829 | 24/03/1999 | 30/06/2005 | Gold |
| PREMIER OIL HOLDINGS LIMITED | 03689620 | 18/06/1999 | 30/06/2005 | Amber |
| PREMIER OIL SOUTH ANDAMAN LIMITED | 01474678 | 30/04/1999 | 30/06/2005 | Amber |
| PREMIER OIL UK LIMITED | SC048705 | 30/04/1999 | 30/06/2005 | Silver |
| PREMIER OVERSEAS HOLDINGS LIMITED | 03689626 | 18/06/1999 | 30/06/2005 | Dissolved |
| PREMIER PENSION PLAN TRUSTEE LIMITED | 02841657 | 01/09/1999 | 22/06/2005 | Not Trading |
| Parambe Oil & Gas Operations Ltd | 01121594 | 30/04/1999 | 30/06/2005 | Dissolved |
| Premier Oil Albania (Holdings) Ltd | 03664109 | 30/04/1999 | 30/06/2005 | Dissolved |
| Premier Oil Dorset Ltd | 01165601 | 30/04/1999 | 30/06/2005 | Dissolved |
| Premier Oil Gabon Ltd | 04718829 | 22/05/2003 | 30/06/2005 | Dissolved |
| Premier Oil Pangkah Ltd | 01012762 | 30/04/1999 | 30/06/2005 | Dissolved |
| Rocky Mountains Oil & Gas Ltd | 01505884 | 30/04/1999 | 30/06/2005 | Dissolved |
| STRATIC ENERGY (DEVELOPMENTS) HOLDINGS LIMITED | 06749831 | 14/11/2008 | 05/11/2010 | Dissolved |
| STRATIC ENERGY (DEVELOPMENTS) LIMITED | 06749898 | 14/11/2008 | 05/11/2010 | Dissolved |
| STRATIC ENERGY (NORTH SEA) LIMITED | 05696700 | 10/07/2008 | 05/11/2010 | Dissolved |
| STRATIC ENERGY (UK) LIMITED | 04758305 | 10/07/2008 | 05/11/2010 | Dissolved |
| STRATIC EXPLORATION (SYRIA) LIMITED | 05971351 | 10/07/2008 | 05/11/2010 | Dissolved |
| STRATIC UK HOLDINGS LIMITED | 05971273 | 10/07/2008 | 05/11/2010 | Insolvent |