| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Burren Energy (Oman) Ltd | 05650588 | 01/02/2008 | Dissolved |
| Burren Energy Drilling Services Ltd | 05588666 | 01/02/2008 | Dissolved |
| Burren Energy New Ventures Ltd | 05890173 | 01/02/2008 | Dissolved |
| E N I Liverpool Bay Ltd | 02566262 | 06/07/2007 | Dissolved |
| ENI BB LIMITED | 00261640 | 22/01/2010 | Dissolved |
| ENI RESOURCES LIMITED | 02161862 | 07/08/2008 | Dissolved |
| ENI TTO LIMITED | 00196665 | 06/07/2007 | Dissolved |
| Eni Securities Ltd | 02351633 | 06/07/2007 | Dissolved |
| FIRST CALGARY PETROLEUMS UK LTD | 06084322 | 26/01/2009 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BURREN ENERGY (EGYPT) LIMITED | 04948245 | 01/02/2008 | 15/11/2010 | One Red Flag |
| BURREN ENERGY (SERVICES) LIMITED | 03060511 | 01/02/2008 | 15/11/2010 | Dissolved |
| BURREN ENERGY INDIA LIMITED | 05319270 | 01/02/2008 | 15/11/2010 | Gold |
| BURREN ENERGY PLC | 03492720 | 01/02/2008 | 02/04/2010 | Gold |
| BURREN ENERGY PLC | 03492720 | 21/07/2008 | 15/11/2010 | Gold |
| ENI AMBALAT LIMITED | 03968980 | 06/07/2007 | 15/11/2010 | Not Trading |
| ENI ANS LIMITED | 02554093 | 06/07/2007 | 15/11/2010 | Dissolved |
| ENI AUSTRALIA LIMITED | 01020949 | 06/07/2007 | 15/11/2010 | Amber |
| ENI BTC LIMITED | 01044120 | 06/07/2007 | 15/11/2010 | Amber |
| ENI BUKAT LIMITED | 03856870 | 06/07/2007 | 15/11/2010 | Not Trading |
| ENI COTE D'IVOIRE LIMITED | 02556415 | 22/01/2010 | 15/11/2010 | Amber |
| ENI GANAL LIMITED | 03771954 | 06/07/2007 | 15/11/2010 | Not Trading |
| ENI HEWETT LIMITED | SC090159 | 28/11/2008 | 15/11/2010 | Silver |
| ENI HYDROCARBONS VENEZUELA LIMITED | 01452037 | 22/01/2010 | 15/11/2010 | Gold |
| ENI INDIA LIMITED | 02735371 | 06/07/2007 | 15/11/2010 | Amber |
| ENI INDONESIA LIMITED | 02334535 | 06/07/2007 | 15/11/2010 | Not Trading |
| ENI INVESTMENTS PLC | 04126448 | 06/07/2007 | 02/12/2010 | Gold |
| ENI JPDA 03-13 LIMITED | 02664257 | 06/07/2007 | 15/11/2010 | Silver |
| ENI KRUENG MANE LIMITED | 03562003 | 06/07/2007 | 15/11/2010 | Not Trading |
| ENI LASMO PLC | 01008965 | 06/07/2007 | 15/11/2010 | Gold |
| ENI LIVERPOOL BAY OPERATING COMPANY LIMITED | 01003825 | 22/01/2010 | 15/11/2010 | Not Trading |
| ENI LNS LIMITED | 00970280 | 06/07/2007 | 15/11/2010 | Not Trading |
| ENI MIDDLE EAST LIMITED | 03180997 | 06/07/2007 | 15/11/2010 | Amber |
| ENI OIL ALGERIA LIMITED | 02274210 | 06/07/2007 | 15/11/2010 | Silver |
| ENI PAPALANG LIMITED | 04530307 | 06/07/2007 | 15/11/2010 | Dissolved |
| ENI POPODI LIMITED | 04530309 | 06/07/2007 | 15/11/2010 | Dissolved |
| ENI RAPAK LIMITED | 03771987 | 06/07/2007 | 15/11/2010 | Not Trading |
| ENI TNS LIMITED | SC055200 | 06/07/2007 | 15/11/2010 | Not Trading |
| ENI UFL LIMITED | 02325373 | 07/08/2008 | 15/11/2010 | Dissolved |
| ENI UK HOLDING PLC | 06428648 | 21/11/2007 | 02/04/2010 | Silver |
| ENI UK HOLDING PLC | 06428648 | 21/11/2007 | 15/11/2010 | Silver |
| ENI UK LIMITED | 00862823 | 06/07/2007 | 15/11/2010 | Silver |
| ENI WEST TIMOR LIMITED | 06606325 | 30/05/2008 | 15/11/2010 | Not Trading |
| ENI YEMEN LIMITED | 05567365 | 01/02/2008 | 15/11/2010 | Gold |
| ITHACA EF LIMITED | 03772746 | 22/01/2010 | 15/11/2010 | Silver |
| ITHACA UKCS LIMITED | 01019748 | 22/01/2010 | 15/11/2010 | Silver |
| PRIME AEP LIMITED | 00307812 | 22/01/2010 | 15/11/2010 | Gold |
| PRIME PAKISTAN LIMITED | 00151940 | 06/07/2007 | 15/11/2010 | Silver |