| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BRIGANTES ENERGY LIMITED | 06759861 | 31/03/2011 | Dissolved |
| Brabant Resources Plc | 02349192 | 03/11/1991 | Dissolved |
| GEOSOLUTIONS LIMITED | 03441912 | 02/05/2003 | Bronze |
| Geosolutions Exploration Ltd | 05289128 | 17/11/2004 | Dissolved |
| UK ONSHORE GEOPHYSICAL LIBRARY | 02927628 | 05/05/1994 | Gold |
| Waterloo Oil & Gas Ltd | 05801984 | 02/05/2006 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BRABANT OIL LIMITED | 02075218 | 02/01/1992 | 31/07/1996 | Dissolved |
| ECORP EUROPE HOLDING LIMITED | 07246887 | 07/05/2010 | 30/11/2010 | Bronze |
| ECORP EUROPE INTERNATIONAL, LTD | 07223237 | 14/04/2010 | 30/11/2010 | Dissolved |
| ECORP OIL & GAS UK LIMITED | 07247502 | 10/05/2010 | 30/11/2010 | One Red Flag |
| EEE LEX LTD | 07681464 | 27/04/2012 | 14/05/2020 | Amber |
| GULFSANDS PETROLEUM PLC | 05302880 | 03/03/2005 | 13/02/2006 | Amber |
| HAGUE AND LONDON OIL PLC | 03793723 | 26/06/2012 | 26/05/2016 | Insolvent |
| HORIZON ENERGY PARTNERS LIMITED | 09245321 | 02/10/2014 | 19/10/2015 | Amber |
| MAGHREB EXPLORATION LIMITED | 05529945 | 11/06/2013 | 30/06/2015 | Dissolved |
| MAX PETROLEUM PLC | 05419021 | 20/12/2012 | 23/12/2015 | Insolvent |
| NOBLE ENERGY (ISE) LIMITED | SC071090 | 15/05/1994 | 31/07/1996 | Dissolved |
| NOBLE ENERGY (OILEX) LIMITED | 00797339 | 22/03/1992 | 31/07/1996 | One Red Flag |
| NORTHPET INVESTMENTS LIMITED | 05220748 | 11/02/2013 | 16/01/2015 | Strike Off |
| ORANJE-NASSAU ENERGIE HANZE (UK) LIMITED | 02085997 | 02/01/1992 | 31/07/1996 | Dissolved |
| PORTLAND GAS LIMITED | 06030680 | 01/10/2010 | 12/01/2011 | Dissolved |
| PORTLAND GAS STORAGE LIMITED | 05365526 | 01/10/2010 | 12/01/2011 | Dissolved |
| PORTLAND GAS TRANSPORTATION LIMITED | 06030685 | 01/10/2010 | 12/01/2011 | Dissolved |
| SUNDA ENERGY PLC | 05098776 | 28/05/2015 | 30/10/2020 | Amber |
| Satellite Positioning Company Limited | 02300896 | 31/05/1991 | 13/04/1993 | Dissolved |
| TETRA ENERGY GAMMA LTD | 09655155 | 03/11/2015 | 01/04/2022 | Silver |
| TETRA ENERGY UK ONSHORE LTD | 06030678 | 31/03/2011 | 01/04/2022 | One Red Flag |
| WESSEX HYDROCARBONS LIMITED | 08958417 | 25/03/2014 | 26/05/2016 | Dissolved |
| WORLD HERITAGE INVESTMENTS LIMITED | 06942066 | 06/09/2009 | 01/06/2012 | Dissolved |