| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CIRCLE OIL PUBLIC LIMITED COMPANY | FC026981 | 06/01/2015 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CALEDONIA EUROPE RESOURCES | 03568322 | 06/11/2001 | 23/10/2003 | Dissolved |
| CALEDONIA OFFSHORE DEVELOPMENT LIMITED | 02042719 | 06/11/2001 | 23/10/2003 | Dissolved |
| Caledonia Europe Hydrocarbons | 03568440 | 06/11/2001 | 23/10/2003 | Dissolved |
| E.ON RUHRGAS UK CAISTER LIMITED | 03883559 | 06/11/2001 | 23/10/2003 | Dissolved |
| E.On Ruhrgas Uk Holding Ltd | 03722631 | 06/11/2001 | 23/10/2003 | Dissolved |
| E.On Ruhrgas Uk Median Ltd | 03974196 | 06/11/2001 | 23/10/2003 | Dissolved |
| FIRST OIL SNS LIMITED | 00986309 | 05/02/2002 | 23/10/2003 | Dissolved |
| PRAX HURRICANE (STRATHMORE) LIMITED | 10654846 | 20/08/2020 | 07/06/2023 | Not Trading |
| PRAX HURRICANE (WHIRLWIND) LIMITED | 10654845 | 20/08/2020 | 08/06/2023 | One Red Flag |
| PRAX HURRICANE BASEMENT LIMITED | 07700492 | 20/08/2020 | 08/06/2023 | Not Trading |
| PRAX HURRICANE GLA LIMITED | 10656211 | 20/08/2020 | 08/06/2023 | Bronze |
| PRAX HURRICANE GROUP LIMITED | 07700755 | 20/08/2020 | 08/06/2023 | Not Trading |
| PRAX HURRICANE GWA LIMITED | 10656130 | 20/08/2020 | 08/06/2023 | One Red Flag |
| PRAX HURRICANE HOLDINGS LIMITED | 10654801 | 20/08/2020 | 07/06/2023 | Not Trading |
| PRAX HURRICANE PETROLEUM LIMITED | 07700415 | 20/08/2020 | 08/06/2023 | Not Trading |
| PRAX UPSTREAM LIMITED | 05245689 | 20/08/2020 | 08/06/2023 | Bronze |
| PREMIER OIL E&P UK ENERGY TRADING LIMITED | 04103928 | 06/11/2001 | 01/11/2002 | Dissolved |
| PREMIER OIL E&P UK EU LIMITED | 02907493 | 06/11/2001 | 23/10/2003 | Silver |