| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ASSOCIATION OF COAL MINE METHANE OPERATORS | 04240944 | 25/06/2001 | Dissolved |
| CAMERON ENERGY ADVISORS LIMITED | 07426276 | 02/11/2010 | Dissolved |
| Earnchase Limited | 02458244 | 10/01/1991 | Dissolved |
| Oms Career Management Ltd | 03017921 | 03/02/1995 | Dissolved |
| Oms Recruitment Ltd | 02976664 | 07/10/1994 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ALKANE ENERGY LIMITED | 02966946 | 12/09/1994 | 14/10/2015 | Silver |
| ALKANE ENERGY UK LIMITED | 03128509 | 20/11/1995 | 31/10/2009 | Bronze |
| ALKANE SERVICES LIMITED | 04715950 | 29/03/2007 | 31/10/2009 | Dissolved |
| ASCENT RESOURCES PLC | 05239285 | 14/09/2010 | 29/07/2019 | One Red Flag |
| COALGAS (CYMRU) LIMITED | 03319158 | 17/02/1997 | 31/10/2009 | Dissolved |
| COALGAS (EUROPE) LIMITED | 03338037 | 21/03/1997 | 31/10/2009 | Dissolved |
| EASTERN PEGASUS LIMITED | 02888171 | 24/03/1997 | 31/10/2009 | Dissolved |
| Oil Management Services Ltd | 01957195 | 07/10/1993 | 18/01/1999 | Dissolved |
| Oms Consultants Ltd | 03163705 | 12/04/1996 | 01/09/1998 | Dissolved |
| POWERHOUSE ENERGY GROUP PLC | 03934451 | 03/10/2017 | 31/03/2021 | Amber |