| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| DRYM DEVELOPMENTS LTD | 09862350 | 09/11/2015 | Bronze |
| ENERSYST LIMITED | 08894952 | 14/02/2014 | Bronze |
| HARTSDALE PENNANT LIMITED | 04306010 | 17/10/2001 | Gold |
| PENNANT WALTERS (FOELT) LIMITED | 08895080 | 14/02/2014 | One Red Flag |
| PENNANT WALTERS (HIRWAUN) LIMITED | 05833522 | 23/06/2006 | Bronze |
| PENNANT WALTERS (HOLDINGS) LIMITED | 05633297 | 23/06/2006 | One Red Flag |
| PENNANT WALTERS (MAESGWYN) HOLDINGS LIMITED | 07037100 | 09/10/2009 | Bronze |
| PENNANT WALTERS (MAESGWYN) LIMITED | 05633352 | 23/06/2006 | One Red Flag |
| PENNANT WALTERS (MAESX) LIMITED | 08894953 | 14/02/2014 | Dissolved |
| PENNANT WALTERS (PANT Y WAL) HOLDINGS LIMITED | 07774357 | 14/09/2011 | Amber |
| PENNANT WALTERS (PANT Y WAL) LIMITED | 05354749 | 07/02/2005 | Amber |
| PENNANT WALTERS (PYWX) HOLDINGS LIMITED | 09673668 | 07/07/2015 | Gold |
| PENNANT WALTERS (PYWX) LIMITED | 08314927 | 30/11/2012 | Silver |
| PENNANT WALTERS (SW) LIMITED | 14422119 | 17/10/2022 | Silver |
| PENNANT WALTERS HIRWAUN (HOLDINGS) LIMITED | 08694625 | 18/09/2013 | Bronze |
| PENNANT WALTERS MCYC LIMITED | 12741586 | 14/07/2020 | One Red Flag |
| PENNANT WALTERS ML LIMITED | 12586872 | 05/05/2020 | One Red Flag |
| PENNANT WALTERS MM LIMITED | 12875710 | 13/09/2020 | One Red Flag |
| PENNANT WALTERS MYG LIMITED | 13773892 | 30/11/2021 | One Red Flag |
| PENNANT WIND ENERGY VENTURES LIMITED | 04583844 | 27/11/2002 | Dissolved |
| PENNANT WIND LIMITED | 04150125 | 13/06/2002 | Dissolved |
| PYWX2 LIMITED | 15553154 | 11/03/2024 | Amber |
| SEVCO 2009 LIMITED | 07030219 | 09/10/2009 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CELTIC ENERGY LIMITED | 02997376 | 21/11/1996 | 14/12/2001 | Amber |
| CELTIC GROUP HOLDINGS | 02885745 | 21/11/1996 | 14/12/2001 | Not Trading |
| COFTON (WALES) LIMITED | 04113370 | 29/03/2001 | 01/11/2002 | Dissolved |
| FUTURECOAL LIMITED | 01947623 | 17/08/1998 | 30/09/2001 | Bronze |
| MERTHYR VILLAGE LIMITED | 04038338 | 17/12/2001 | 31/03/2005 | Dissolved |