| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BALNAPALING ENERGY HOLDINGS LIMITED | 04329897 | 23/01/2003 | Dissolved |
| FG GEOSCIENCE LTD | 13660373 | 04/10/2021 | Dissolved |
| HEARD UPSTREAM CONSULTING LTD | 10658336 | 08/03/2017 | Gold |
| HORIZON ENERGY ACQUISITION LIMITED | 11825473 | 01/04/2023 | Gold |
| HORIZON ENERGY PARTNERS LIMITED | 09245321 | 01/04/2023 | Amber |
| Heard Oil Plc | 03532950 | 24/03/1998 | Dissolved |
| Keel Asset Marketing Ltd | 03552888 | 27/04/1998 | Dissolved |
| LORD ROBERTS MEWS MANAGEMENT LIMITED | 01729615 | 28/04/2003 | Gold |
| NIGG ENVIRONMENTAL SERVICES LIMITED | 04330058 | 20/01/2005 | Dissolved |
| NORTH FALKLAND EXPLORATION COMPANY LIMITED | 11422434 | 19/06/2018 | Not Trading |
| OIL & GAS INVESTMENTS LIMITED. | 04651928 | 03/04/2003 | Dissolved |
| POZAS LIMITED | 05081705 | 20/04/2005 | Dissolved |
| Petroleum Resources Ltd | 03499908 | 27/01/1998 | Dissolved |
| UK ONSHORE GEOPHYSICAL LIBRARY | 02927628 | 27/09/2016 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AYOOPCO LIMITED | 04050229 | 16/01/2003 | 27/01/2006 | Dissolved |
| CABOT ENERGY LIMITED | 02933545 | 08/05/2007 | 31/12/2014 | One Red Flag |
| GAS STORAGE LIMITED | 06145223 | 08/03/2007 | 17/10/2008 | Dissolved |
| MEDUSA HYDROCARBONS LIMITED | 02684930 | 27/01/2000 | 31/10/2003 | Dissolved |
| NORTHERN PETROLEUM (UK) LIMITED | 03970675 | 21/10/2002 | 05/01/2015 | One Red Flag |
| NORTHERN PETROLEUM E&P HOLDINGS LIMITED | 03971175 | 24/11/2003 | 25/08/2004 | Dissolved |
| NORTHERN PETROLEUM LIMITED | 04993628 | 07/01/2004 | 05/01/2015 | Dissolved |
| NORTHPET INVESTMENTS LIMITED | 05220748 | 31/12/2007 | 12/01/2015 | Strike Off |
| NP NETHERLANDS LIMITED | 04993632 | 11/11/2004 | 05/01/2015 | One Red Flag |
| NP OIL & GAS HOLDINGS LIMITED | 04991255 | 30/06/2008 | 05/01/2015 | Amber |
| OVERSEAS GAS STORAGE LIMITED | 06142440 | 07/03/2007 | 17/10/2008 | Dissolved |
| UKOG (GB) LIMITED | 04050227 | 21/10/2002 | 17/10/2014 | Gold |
| UKOG SOLENT LIMITED | 05000092 | 19/03/2004 | 17/10/2014 | Dissolved |
| UKOG WEALD LIMITED | 04991234 | 07/01/2004 | 17/10/2014 | Dissolved |