| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| IOG PLC | 07434350 | 23/05/2019 | Insolvent |
| NEIL HAWKINGS LIMITED | 10046060 | 07/03/2016 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ENCORE (NNS) LIMITED | 05301950 | 16/01/2012 | 30/06/2016 | One Red Flag |
| ENCORE (VOG) LIMITED | 05697504 | 16/01/2012 | 29/05/2015 | Dissolved |
| ENCORE CCS LIMITED | 06449599 | 16/01/2012 | 29/05/2015 | Dissolved |
| ENCORE NATURAL RESOURCES LIMITED | 05432824 | 16/01/2012 | 29/05/2015 | Dissolved |
| ENCORE OIL AND GAS LIMITED | 05388531 | 16/01/2012 | 29/05/2015 | Dissolved |
| ENCORE OIL LIMITED | 03328217 | 16/01/2012 | 30/06/2016 | Silver |
| HARBOUR ENERGY CENTRAL ANDAMAN LIMITED | 08534717 | 17/05/2013 | 30/06/2016 | Not Trading |
| HARBOUR ENERGY PLC | SC234781 | 23/03/2006 | 30/06/2016 | Silver |
| NAVITAS PETROLEUM DEVELOPMENT AND PRODUCTION LTD | 08138246 | 11/07/2012 | 30/06/2016 | Amber |
| PREMIER OIL (ENCORE PETROLEUM) LIMITED | 05388528 | 16/01/2012 | 30/06/2016 | One Red Flag |
| PREMIER OIL ABERDEEN SERVICES LIMITED | 01164961 | 15/06/2009 | 30/06/2016 | Amber |
| PREMIER OIL AND GAS SERVICES LIMITED | 03468792 | 30/06/2005 | 30/06/2016 | Silver |
| PREMIER OIL ANDAMAN LIMITED | 08534721 | 17/05/2013 | 30/06/2016 | Amber |
| PREMIER OIL ANS HOLDINGS LIMITED | 05452607 | 16/01/2012 | 29/05/2015 | Insolvent |
| PREMIER OIL ANS LIMITED | 05681805 | 16/01/2012 | 29/05/2015 | One Red Flag |
| PREMIER OIL BARAKUDA LIMITED | 05052042 | 16/01/2012 | 29/05/2015 | Silver |
| PREMIER OIL BUKIT BARAT LIMITED | 08171294 | 07/08/2012 | 30/06/2016 | Dissolved |
| PREMIER OIL CCS LIMITED | 08097126 | 07/06/2012 | 30/06/2016 | Dissolved |
| PREMIER OIL EXPLORATION AND PRODUCTION (IRAQ) LIMITED | 08140505 | 12/07/2012 | 30/06/2016 | Dissolved |
| PREMIER OIL EXPLORATION LIMITED | SC021265 | 30/06/2005 | 30/06/2016 | Silver |
| PREMIER OIL EXPLORATION ONS LIMITED | 01241035 | 21/05/2009 | 29/05/2015 | Insolvent |
| PREMIER OIL GROUP LIMITED | SC017829 | 29/09/2005 | 30/06/2016 | Gold |
| PREMIER OIL HOLDINGS LIMITED | 03689620 | 30/06/2005 | 30/06/2016 | Amber |
| PREMIER OIL INVESTMENTS LIMITED | 07252514 | 04/08/2010 | 30/06/2016 | Dissolved |
| PREMIER OIL MEXICO HOLDINGS LIMITED | 08033702 | 17/04/2012 | 30/06/2016 | Amber |
| PREMIER OIL MEXICO INVESTMENTS LIMITED | 08279035 | 02/11/2012 | 30/06/2016 | One Red Flag |
| PREMIER OIL ONS LIMITED | 04453364 | 21/05/2009 | 29/05/2015 | Not Trading |
| PREMIER OIL UK LIMITED | SC048705 | 30/06/2005 | 30/06/2016 | Amber |
| PREMIER OIL VIETNAM 121 LIMITED | 07961063 | 22/02/2012 | 30/06/2016 | One Red Flag |