| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Burren Energy Drilling Services Ltd | 05588666 | 01/02/2008 | Dissolved |
| Burren Energy New Ventures Ltd | 05890173 | 01/02/2008 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BURREN ENERGY (EGYPT) LIMITED | 04948245 | 01/02/2008 | 15/06/2009 | One Red Flag |
| BURREN ENERGY (SERVICES) LIMITED | 03060511 | 01/02/2008 | 15/06/2009 | Dissolved |
| BURREN ENERGY INDIA LIMITED | 05319270 | 01/02/2008 | 15/06/2009 | Gold |
| BURREN ENERGY PLC | 03492720 | 01/02/2008 | 15/06/2009 | Gold |
| Burren Energy (Oman) Ltd | 05650588 | 01/02/2008 | 15/06/2009 | Dissolved |
| ENI BB LIMITED | 00261640 | 09/11/2007 | 15/06/2009 | Dissolved |
| ENI COTE D'IVOIRE LIMITED | 02556415 | 09/11/2007 | 15/06/2009 | Amber |
| ENI ELGIN/FRANKLIN LIMITED | 03772746 | 09/11/2007 | 15/06/2009 | Silver |
| ENI HEWETT LIMITED | SC090159 | 28/11/2008 | 15/06/2009 | Silver |
| ENI HYDROCARBONS VENEZUELA LIMITED | 01452037 | 09/11/2007 | 15/06/2009 | Gold |
| ENI INVESTMENTS PLC | 04126448 | 09/11/2007 | 15/06/2009 | Gold |
| ENI LIVERPOOL BAY OPERATING COMPANY LIMITED | 01003825 | 09/11/2007 | 15/06/2009 | Not Trading |
| ENI LNS LIMITED | 00970280 | 09/11/2007 | 15/06/2009 | Not Trading |
| ENI MIDDLE EAST LIMITED | 03180997 | 14/11/2007 | 15/06/2009 | Amber |
| ENI OIL ALGERIA LIMITED | 02274210 | 09/11/2007 | 15/06/2009 | Gold |
| ENI RESOURCES LIMITED | 02161862 | 07/08/2008 | 15/06/2009 | Dissolved |
| ENI TNS LIMITED | SC055200 | 09/11/2007 | 15/06/2009 | Not Trading |
| ENI TTO LIMITED | 00196665 | 09/11/2007 | 15/06/2009 | Dissolved |
| ENI UFL LIMITED | 02325373 | 07/08/2008 | 15/06/2009 | Dissolved |
| ENI UHL LIMITED | 00916179 | 09/11/2007 | 15/06/2009 | Silver |
| ENI UK HOLDING PLC | 06428648 | 21/11/2007 | 15/06/2009 | Silver |
| ENI UK LIMITED | 00862823 | 09/11/2007 | 15/06/2009 | Silver |
| ENI UKCS LIMITED | 01019748 | 09/11/2007 | 15/06/2009 | Gold |
| ENI ULT LIMITED | 00301317 | 09/11/2007 | 15/06/2009 | Silver |
| ENI ULX LIMITED | 00936223 | 09/11/2007 | 15/06/2009 | Silver |
| ENI YEMEN LIMITED | 05567365 | 01/02/2008 | 15/06/2009 | Gold |
| PRIME AEP LIMITED | 00307812 | 09/11/2007 | 15/06/2009 | Gold |
| THE ITALIAN CHAMBER OF COMMERCE AND INDUSTRY FOR THE UNITED KINGDOM | 00598572 | 18/03/2008 | 24/06/2009 | Gold |