| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Cobham Oil and Gas Limited | 02777423 | 15/08/2003 | Dissolved |
| FORCETEN DEVELOPMENT COMPANY LIMITED | 02173368 | 31/12/1991 | Dissolved |
| STERLING ENERGY (NORTH AMERICA) LIMITED | 06035889 | 15/09/2009 | Dissolved |
| STERLING OIL LIMITED | 03970813 | 15/09/2009 | Dissolved |
| Sterling Energy (Mauritania) Ltd | 05696053 | 15/09/2009 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AFENTRA (UK) LTD | 04087253 | 15/09/2009 | 10/05/2016 | One Red Flag |
| AFENTRA OVERSEAS LIMITED | 09353584 | 12/12/2014 | 10/05/2016 | Silver |
| AFENTRA PLC | 01757721 | 08/09/2009 | 10/05/2016 | Bronze |
| Central Fuel Caspian Sea Ltd | 03023913 | 02/06/1998 | 04/11/1999 | Dissolved |
| EMERALD ENERGY PLC | FC017959 | 15/08/2003 | 14/10/2009 | Silver |
| EUROSOV ENERGY LIMITED | 03429543 | 01/09/1997 | 23/06/2000 | Dissolved |
| Emerald Energy (Syria) Ltd. | 05305465 | 06/12/2004 | 14/10/2009 | Dissolved |
| GULFSANDS PETROLEUM PLC | 05302880 | 14/04/2015 | 22/07/2016 | Amber |
| SIBIR ENERGY LIMITED | 03204093 | 15/06/1999 | 23/06/2000 | Dissolved |
| STERLING ENERGY (INTERNATIONAL) LIMITED | 05979751 | 15/09/2009 | 10/05/2016 | Dissolved |
| STERLING ENERGY MAURITANIA LIMITED | 09352261 | 12/12/2014 | 10/05/2016 | Dissolved |