| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CELTIQUE EAST MIDLANDS LIMITED | 07391409 | 01/01/2015 | Dissolved |
| CELTIQUE ENERGIE HOLDINGS LIMITED | 07448632 | 10/03/2011 | Dissolved |
| CELTIQUE ENERGIE PETROLEUM LTD | 05770790 | 01/01/2015 | Dissolved |
| CELTIQUE VAUD LIMITED | 07391662 | 01/01/2015 | Dissolved |
| Jkj & Associates Ltd | 04068834 | 26/09/2000 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ACTEON GROUP LIMITED | 04231212 | 08/06/2001 | 09/11/2006 | Amber |
| Blackfriars Oil & Gas Ltd | 00818091 | 29/05/1992 | 24/04/1996 | Dissolved |
| CALEDONIA EUROPE RESOURCES | 03568322 | 23/10/2003 | 09/11/2005 | Dissolved |
| CALEDONIA OFFSHORE DEVELOPMENT LIMITED | 02042719 | 23/10/2003 | 09/11/2005 | Dissolved |
| CELTIQUE ENERGIE LTD | 05296922 | 01/01/2015 | 30/03/2017 | Dissolved |
| CENTRICA PRODUCTION (DMF) LIMITED | 01483729 | 03/04/1996 | 01/02/1999 | Dissolved |
| CHRYSAOR HOLDINGS LIMITED | FC027988 | 11/07/2013 | 04/09/2019 | One Red Flag |
| Caledonia Europe Hydrocarbons | 03568440 | 23/10/2003 | 09/11/2005 | Dissolved |
| E.ON RUHRGAS UK CAISTER LIMITED | 03883559 | 23/10/2003 | 09/11/2005 | Dissolved |
| E.ON RUHRGAS UK NORTH SEA LIMITED | SC240197 | 23/10/2003 | 09/11/2005 | Dissolved |
| E.On Ruhrgas Uk Holding Ltd | 03722631 | 23/10/2003 | 09/11/2005 | Dissolved |
| E.On Ruhrgas Uk Median Ltd | 03974196 | 23/10/2003 | 09/11/2005 | Dissolved |
| ENI INDONESIA LIMITED | 02334535 | 15/02/1994 | 01/02/1999 | Not Trading |
| ENI INTERNATIONAL LIMITED | 01431033 | 15/02/1994 | 01/02/1999 | Dissolved |
| ENI KRUENG MANE LIMITED | 03562003 | 06/05/1998 | 01/02/1999 | Not Trading |
| ENI LASMO PLC | 01008965 | 23/02/1993 | 27/04/1999 | Gold |
| ENI LNS LIMITED | 00970280 | 08/05/1992 | 01/02/1999 | Not Trading |
| ENI OIL ALGERIA LIMITED | 02274210 | 15/02/1994 | 01/02/1999 | Silver |
| ENI TNS LIMITED | SC055200 | 05/01/1990 | 01/02/1999 | Not Trading |
| ENI TTO LIMITED | 00196665 | 08/05/1992 | 01/02/1999 | Dissolved |
| ENI ULT LIMITED | 00301317 | 29/05/1992 | 01/02/1999 | Silver |
| ENI ULX LIMITED | 00936223 | 29/05/1992 | 01/02/1999 | Silver |
| Eni International Exploration Ltd | 02451388 | 15/02/1994 | 01/02/1999 | Dissolved |
| Eni Malacca Ltd | 01664303 | 15/02/1994 | 12/03/1998 | Dissolved |
| Eni Malagot Ltd | 03478543 | 04/12/1997 | 01/02/1999 | Dissolved |
| Eni Overseas Holdings Ltd | 01431776 | 15/02/1994 | 01/02/1999 | Dissolved |
| Eni Tns Holdings Ltd | 00518762 | 08/05/1992 | 01/02/1999 | Dissolved |
| Eni Trading Ltd | 01521565 | 15/02/1994 | 01/02/1999 | Dissolved |
| FIRST OIL SNS LIMITED | 00986309 | 23/10/2003 | 19/10/2004 | Dissolved |
| Hautpas Ltd | 01137767 | 08/05/1992 | 24/04/1996 | Dissolved |
| INEOS UK E&P HOLDINGS LIMITED | SC200459 | 16/10/2000 | 05/02/2002 | Amber |
| INEOS UK SNS LIMITED | 01021338 | 16/10/2000 | 05/02/2002 | Silver |
| KRAKEN ROBOTICS SERVICES UK LIMITED | SC369756 | 09/12/2009 | 24/02/2011 | One Red Flag |
| L A S M O (Corby) Ltd | 01125087 | 29/05/1992 | 24/04/1996 | Dissolved |
| LASMO (TSA) LIMITED | SC034216 | 06/03/1989 | 24/04/1996 | Dissolved |
| LASMO OIL (EGYPT) LIMITED | 02147928 | 10/05/1996 | 01/02/1999 | Dissolved |
| LASMO PETROLEUM (MINERALS) LIMITED | 01073330 | 08/05/1992 | 24/04/1996 | Dissolved |
| LASMO VIETNAM LIMITED | 02510072 | 15/02/1994 | 01/02/1999 | Dissolved |
| Lasmo (Azerbaijan) Ltd | 03525154 | 05/03/1998 | 01/02/1999 | Dissolved |
| Lasmo (Tsp) Ltd | SC049025 | 06/03/1989 | 08/09/1997 | Dissolved |
| Lasmo (U D G ) Plc | 01234982 | 29/05/1992 | 24/04/1996 | Dissolved |
| Lasmo (Vei) Ltd | 03173751 | 12/05/1997 | 01/02/1999 | Dissolved |
| Lasmo Claymore Petroleum Ltd | SC056731 | 06/03/1989 | 24/04/1996 | Dissolved |
| Lasmo Cumi-Cumi Ltd | 02544269 | 15/02/1994 | 01/02/1999 | Dissolved |
| Lasmo Grand Maghreb Ltd | 02466698 | 23/12/1993 | 01/02/1999 | Dissolved |
| Lasmo Kakap Ltd | 01682791 | 15/02/1994 | 12/03/1998 | Dissolved |
| Lasmo Madura Ltd | 01750351 | 15/02/1994 | 12/03/1998 | Dissolved |
| Lasmo Oil (Aden) Ltd | 02196078 | 15/02/1994 | 24/04/1996 | Dissolved |
| Neptune (T T 0) | 01499050 | 08/05/1992 | 24/04/1996 | Dissolved |
| PERENCO OIL AND GAS COLOMBIA LIMITED | 01789505 | 15/02/1994 | 16/09/1998 | Gold |
| PRAX UPSTREAM LIMITED | 05245689 | 08/03/2013 | 01/03/2016 | Bronze |
| PREMIER OIL E&P UK EU LIMITED | 02907493 | 23/10/2003 | 09/11/2005 | Silver |
| PRIME PAKISTAN LIMITED | 00151940 | 15/02/1994 | 01/02/1999 | Silver |
| Petroleum Science & Technology Institute (The) | SC120900 | 19/10/1991 | 01/04/1993 | Dissolved |
| RWE DEA UK DEVELOPMENT LIMITED | 03976025 | 31/10/2000 | 05/02/2002 | Dissolved |
| RWE DEA UK EXPLORATION LIMITED | 03309304 | 16/10/2000 | 05/02/2002 | Dissolved |
| RWE DEA UK LIMITED | SC191561 | 16/10/2000 | 05/02/2002 | Dissolved |
| SHENANDOAH EXPLORATION LIMITED | 02023496 | 08/08/2000 | 30/01/2001 | Dissolved |
| Swetenhams Ltd | 01551791 | 15/02/1994 | 19/03/1995 | Dissolved |
| U.W.G. LIMITED | 02369087 | 02/01/2001 | 14/12/2001 | Amber |
| UKOG (234) LTD | 07055133 | 01/01/2015 | 11/08/2016 | One Red Flag |