| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Burren Energy (652A) Ltd | 05860422 | 19/07/2006 | Dissolved |
| DBP SERVICES (UK) LTD | 07095102 | 04/12/2009 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BAYFIELD ENERGY LIMITED | 06395419 | 10/10/2007 | 28/01/2008 | One Red Flag |
| BURREN ENERGY (EGYPT) LIMITED | 04948245 | 07/01/2004 | 01/02/2008 | One Red Flag |
| BURREN ENERGY (SERVICES) LIMITED | 03060511 | 07/09/2006 | 01/02/2008 | Dissolved |
| BURREN ENERGY INDIA LIMITED | 05319270 | 11/02/2005 | 01/02/2008 | Gold |
| BURREN ENERGY PLC | 03492720 | 27/01/1999 | 01/02/2008 | Gold |
| Burren Energy (Oman) Ltd | 05650588 | 09/12/2005 | 01/02/2008 | Dissolved |
| Burren Energy Drilling Services Ltd | 05588666 | 11/10/2005 | 01/02/2008 | Dissolved |
| Burren Energy New Ventures Ltd | 05890173 | 28/07/2006 | 01/02/2008 | Dissolved |
| CASPIAN AND GULF UK LIMITED | 07111170 | 22/12/2009 | 21/11/2012 | Dissolved |
| ENI YEMEN LIMITED | 05567365 | 19/09/2005 | 01/02/2008 | Gold |
| ESSAR CAPITAL SERVICES (UK) LIMITED | 07020776 | 24/11/2015 | 20/05/2016 | One Red Flag |
| ESSAR ENERGY SERVICES (UK) LIMITED | 07218027 | 24/08/2015 | 06/06/2016 | Amber |
| EXORO ENERGY INTERNATIONAL LIMITED | FC031054 | 02/11/2012 | 14/11/2017 | Bronze |
| NOSTRUM OIL & GAS PLC | 08717287 | 19/05/2014 | 14/02/2023 | Silver |
| STRAND OIL AND GAS LIMITED | 06490238 | 31/01/2008 | 10/04/2008 | Dissolved |
| STRAND OIL AND GAS LIMITED | 06490238 | 31/01/2008 | 31/01/2011 | Dissolved |
| TRINITY EXPLORATION AND PRODUCTION SERVICES (UK) LIMITED | 06581076 | 30/04/2008 | 10/07/2008 | One Red Flag |
| VILLIERS LIMITED | 05054307 | 24/02/2004 | 31/01/2011 | Silver |