| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CHRYSAOR INVESTMENTS LIMITED | 02673868 | 20/10/2021 | Dissolved |
| CHRYSAOR PETROLEUM CHEMICALS U.K. LIMITED | 01194149 | 20/10/2021 | Dissolved |
| CHRYSAOR PRODUCTION OIL (GB) LIMITED | 01505606 | 20/10/2021 | Dissolved |
| CHRYSAOR SUPPLY & TRADING LIMITED | 04130571 | 20/10/2021 | Dissolved |
| ENCORE (NNS) LIMITED | 05301950 | 15/04/2021 | One Red Flag |
| ENCORE (VOG) LIMITED | 05697504 | 15/04/2021 | Dissolved |
| ENCORE CCS LIMITED | 06449599 | 15/04/2021 | Dissolved |
| ENCORE NATURAL RESOURCES LIMITED | 05432824 | 15/04/2021 | Dissolved |
| ENCORE OIL AND GAS LIMITED | 05388531 | 15/04/2021 | Dissolved |
| ENCORE OIL LIMITED | 03328217 | 15/04/2021 | Silver |
| HARBOUR ENERGY DEVELOPMENTS LIMITED | 03230514 | 20/10/2021 | Not Trading |
| HARBOUR ENERGY PRODUCTION LIMITED | 15096672 | 25/08/2023 | Bronze |
| HARBOUR ENERGY SECRETARIES LIMITED | 12288531 | 15/04/2021 | Not Trading |
| PREMIER OIL (ENCORE PETROLEUM) LIMITED | 05388528 | 15/04/2021 | One Red Flag |
| PREMIER OIL ANS HOLDINGS LIMITED | 05452607 | 15/04/2021 | Insolvent |
| PREMIER OIL ANS LIMITED | 05681805 | 15/04/2021 | One Red Flag |
| PREMIER OIL BELGRAVIA HOLDINGS LIMITED | 12288712 | 15/04/2021 | Dissolved |
| PREMIER OIL BELGRAVIA LIMITED | 12290237 | 15/04/2021 | Dissolved |
| PREMIER OIL BUKIT BARAT LIMITED | 08171294 | 15/04/2021 | Dissolved |
| PREMIER OIL CCS LIMITED | 08097126 | 15/04/2021 | Dissolved |
| PREMIER OIL EXPLORATION (MAURITANIA) LIMITED | FC041297 | 12/02/2024 | Amber |
| PREMIER OIL EXPLORATION AND PRODUCTION (IRAQ) LIMITED | 08140505 | 15/04/2021 | Dissolved |
| PREMIER OIL EXPLORATION LIMITED | SC021265 | 15/04/2021 | Silver |
| PREMIER OIL EXPLORATION ONS LIMITED | 01241035 | 15/04/2021 | Insolvent |
| PREMIER OIL FAR EAST LIMITED | 01135444 | 15/04/2021 | Bronze |
| PREMIER OIL INVESTMENTS LIMITED | 07252514 | 15/04/2021 | Dissolved |
| PREMIER OIL MAURITANIA B LIMITED | FC041296 | 12/02/2024 | Amber |
| PREMIER OIL ONS LIMITED | 04453364 | 15/04/2021 | Not Trading |
| PREMIER OIL VIETNAM 121 LIMITED | 07961063 | 15/04/2021 | One Red Flag |
| PREMIER OVERSEAS HOLDINGS LIMITED | 03689626 | 15/04/2021 | Dissolved |
| RAW RESILIENCE LTD | 11055475 | 09/11/2017 | Dissolved |
| XEO EXPLORATION LIMITED | 07358244 | 15/04/2021 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ENCORE (NNS) LIMITED | 05301950 | 29/05/2015 | 18/01/2017 | One Red Flag |
| ENCORE (VOG) LIMITED | 05697504 | 29/05/2015 | 18/01/2017 | Dissolved |
| ENCORE CCS LIMITED | 06449599 | 29/05/2015 | 18/01/2017 | Dissolved |
| ENCORE NATURAL RESOURCES LIMITED | 05432824 | 29/05/2015 | 18/01/2017 | Dissolved |
| ENCORE OIL AND GAS LIMITED | 05388531 | 29/05/2015 | 18/01/2017 | Dissolved |
| ENCORE OIL LIMITED | 03328217 | 29/05/2015 | 18/01/2017 | Silver |
| HARBOUR ENERGY CENTRAL ANDAMAN LIMITED | 08534717 | 29/05/2015 | 18/01/2017 | Not Trading |
| MAGHREB OFFSHORE LIMITED | 01057332 | 29/05/2015 | 18/05/2016 | Dissolved |
| NAVITAS PETROLEUM DEVELOPMENT AND PRODUCTION LTD | 08138246 | 29/05/2015 | 18/01/2017 | Amber |
| PREMIER OIL (ENCORE PETROLEUM) LIMITED | 05388528 | 29/05/2015 | 18/01/2017 | One Red Flag |
| PREMIER OIL ABERDEEN SERVICES LIMITED | 01164961 | 29/05/2015 | 18/01/2017 | Amber |
| PREMIER OIL AND GAS SERVICES LIMITED | 03468792 | 29/05/2015 | 18/01/2017 | Silver |
| PREMIER OIL ANDAMAN I LIMITED | 07447540 | 29/05/2015 | 18/01/2017 | Bronze |
| PREMIER OIL ANDAMAN LIMITED | 08534721 | 29/05/2015 | 18/01/2017 | Amber |
| PREMIER OIL ANS HOLDINGS LIMITED | 05452607 | 29/05/2015 | 18/01/2017 | Insolvent |
| PREMIER OIL ANS LIMITED | 05681805 | 29/05/2015 | 18/01/2017 | One Red Flag |
| PREMIER OIL BARAKUDA LIMITED | 05052042 | 29/05/2015 | 18/01/2017 | Silver |
| PREMIER OIL BUKIT BARAT LIMITED | 08171294 | 29/05/2015 | 18/01/2017 | Dissolved |
| PREMIER OIL CCS LIMITED | 08097126 | 29/05/2015 | 18/01/2017 | Dissolved |
| PREMIER OIL EXPLORATION AND PRODUCTION (IRAQ) LIMITED | 08140505 | 29/05/2015 | 18/01/2017 | Dissolved |
| PREMIER OIL EXPLORATION LIMITED | SC021265 | 29/05/2015 | 18/01/2017 | Silver |
| PREMIER OIL EXPLORATION ONS LIMITED | 01241035 | 29/05/2015 | 18/01/2017 | Insolvent |
| PREMIER OIL FAR EAST LIMITED | 01135444 | 29/05/2015 | 18/01/2017 | Bronze |
| PREMIER OIL FINANCE (JERSEY) LIMITED | FC033995 | 05/01/2017 | 18/01/2017 | Dissolved |
| PREMIER OIL GROUP LIMITED | SC017829 | 29/05/2015 | 18/01/2017 | Gold |
| PREMIER OIL HOLDINGS LIMITED | 03689620 | 29/05/2015 | 18/01/2017 | Amber |
| PREMIER OIL INVESTMENTS LIMITED | 07252514 | 29/05/2015 | 18/01/2017 | Dissolved |
| PREMIER OIL MEXICO HOLDINGS LIMITED | 08033702 | 29/05/2015 | 18/01/2017 | Amber |
| PREMIER OIL MEXICO INVESTMENTS LIMITED | 08279035 | 29/05/2015 | 18/01/2017 | One Red Flag |
| PREMIER OIL ONS LIMITED | 04453364 | 29/05/2015 | 18/01/2017 | Not Trading |
| PREMIER OIL SOUTH ANDAMAN LIMITED | 01474678 | 29/05/2015 | 18/01/2017 | Bronze |
| PREMIER OIL UK LIMITED | SC048705 | 29/05/2015 | 18/01/2017 | Amber |
| PREMIER OIL VIETNAM 121 LIMITED | 07961063 | 29/05/2015 | 18/01/2017 | One Red Flag |
| PREMIER OVERSEAS HOLDINGS LIMITED | 03689626 | 29/05/2015 | 18/01/2017 | Dissolved |
| XEO EXPLORATION LIMITED | 07358244 | 29/05/2015 | 18/01/2017 | Dissolved |