| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AFREN ASSETS LIMITED | 09671709 | 06/07/2015 | Dissolved |
| AFREN PLC | 05304498 | 25/06/2015 | Dissolved |
| ENI BBOH LIMITED | 01020948 | 08/08/2002 | Dissolved |
| ENI BRUPEX LIMITED | 00135247 | 08/08/2002 | Dissolved |
| ENI MOG LIMITED | 03211318 | 11/01/2000 | Dissolved |
| Eni Energy Ltd | 00176270 | 10/02/2003 | Dissolved |
| Eni International Exploration Ltd | 02451388 | 10/02/2003 | Dissolved |
| Eni Lasmo Trustee Ltd | 02507284 | 08/06/2001 | Dissolved |
| Eni Mhh Ltd | 01820901 | 06/11/2001 | Dissolved |
| Eni Neptune Ltd | 01198236 | 10/02/2003 | Dissolved |
| Eni Tns Holdings Ltd | 00518762 | 30/07/1999 | Dissolved |
| HURRIAN RESOURCES LIMITED | 07397887 | 28/02/2011 | Dissolved |
| MELROSE IRAQ LIMITED | 07398574 | 28/02/2011 | Dissolved |
| PETROCELTIC GREECE LIMITED | SC376121 | 01/04/2010 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CENTRICA PRODUCTION (DMF) LIMITED | 01483729 | 30/07/1999 | 19/05/2004 | Dissolved |
| CHEIRON ENERGY LIMITED | 07201627 | 06/07/2020 | 19/02/2024 | Bronze |
| DANA GAS UK LIMITED | 05889472 | 27/07/2006 | 01/08/2007 | Dissolved |
| E N I Liverpool Bay Ltd | 02566262 | 30/06/1999 | 01/09/2004 | Dissolved |
| ENI ANS LIMITED | 02554093 | 08/08/2002 | 24/05/2006 | Dissolved |
| ENI AUSTRALIA LIMITED | 01020949 | 04/10/2004 | 19/12/2005 | Amber |
| ENI BB LIMITED | 00261640 | 08/08/2002 | 01/09/2004 | Dissolved |
| ENI COTE D'IVOIRE LIMITED | 02556415 | 02/09/2002 | 01/09/2004 | Amber |
| ENI HYDROCARBONS VENEZUELA LIMITED | 01452037 | 08/08/2002 | 01/09/2004 | Gold |
| ENI INDIA LIMITED | 02735371 | 08/08/2002 | 01/09/2004 | Amber |
| ENI INTERNATIONAL LIMITED | 01431033 | 11/01/2000 | 22/09/2004 | Dissolved |
| ENI INVESTMENTS PLC | 04126448 | 18/09/2002 | 01/09/2004 | Gold |
| ENI JPDA 03-13 LIMITED | 02664257 | 04/10/2004 | 19/12/2005 | Silver |
| ENI LASMO PLC | 01008965 | 30/04/2001 | 01/09/2004 | Gold |
| ENI LIVERPOOL BAY OPERATING COMPANY LIMITED | 01003825 | 08/08/2002 | 01/09/2004 | Not Trading |
| ENI LNS LIMITED | 00970280 | 30/07/1999 | 01/09/2004 | Not Trading |
| ENI MEP LIMITED | 00231611 | 30/06/1999 | 01/09/2004 | Dissolved |
| ENI MIDDLE EAST LIMITED | 03180997 | 30/04/2001 | 01/09/2004 | Amber |
| ENI OIL ALGERIA LIMITED | 02274210 | 30/07/1999 | 01/09/2004 | Silver |
| ENI RESOURCES LIMITED | 02161862 | 30/06/1999 | 07/08/2008 | Dissolved |
| ENI TNS LIMITED | SC055200 | 30/07/1999 | 01/09/2004 | Not Trading |
| ENI TTO LIMITED | 00196665 | 30/07/1999 | 01/09/2004 | Dissolved |
| ENI UHL LIMITED | 00916179 | 11/01/2000 | 31/08/2004 | Silver |
| ENI UK LIMITED | 00862823 | 10/05/2001 | 31/08/2004 | Silver |
| ENI ULT LIMITED | 00301317 | 10/02/2003 | 01/09/2004 | Silver |
| ENI ULX LIMITED | 00936223 | 30/07/1999 | 01/09/2004 | Silver |
| ENI VENTURES PLC | 03939723 | 20/02/2002 | 01/09/2004 | Dissolved |
| Eni Neptune Ltd | 01198236 | 08/08/2002 | 11/12/2002 | Dissolved |
| Eni Overseas Holdings Ltd | 01431776 | 11/01/2000 | 01/09/2004 | Dissolved |
| Eni Trading Ltd | 01521565 | 11/01/2000 | 01/09/2004 | Dissolved |
| ITHACA EF LIMITED | 03772746 | 08/08/2002 | 01/09/2004 | Silver |
| ITHACA UKCS LIMITED | 01019748 | 08/08/2002 | 01/09/2004 | Silver |
| MELROSE MEDITERRANEAN LIMITED | 02823058 | 20/07/2011 | 10/04/2015 | One Red Flag |
| PETROCELTIC ENERGY LIMITED | SC164387 | 17/01/2013 | 10/04/2015 | Dissolved |
| PETROCELTIC RESOURCES LIMITED | 03210072 | 04/06/2007 | 10/04/2015 | Dissolved |
| PETROCELTIC TURKEY LIMITED | SC299984 | 17/01/2013 | 10/04/2015 | Dissolved |
| PRIME AEP LIMITED | 00307812 | 08/08/2002 | 01/09/2004 | Gold |
| PRIME GLOBAL ENERGIES LIMITED | 00151940 | 05/09/2004 | 05/12/2005 | Silver |