| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CADENT GAS LIMITED | 10080864 | 28/11/2018 | Bronze |
| CONNEX BIDCO LIMITED | 15332721 | 06/12/2023 | Amber |
| CONNEX HOLDCO LIMITED | 15332252 | 06/12/2023 | Amber |
| FILLY BIDCO LIMITED | 13165352 | 28/01/2021 | Dissolved |
| FILLY CONSORTIUM LIMITED | 13158463 | 26/01/2021 | Dissolved |
| FILLY MIDCO LIMITED | 13160011 | 26/01/2021 | Dissolved |
| GAST MIDCO LIMITED | 14177081 | 16/06/2022 | Bronze |
| GAST PLEDGECO LIMITED | 14176779 | 16/06/2022 | Gold |
| GAST TOPCO LIMITED | 14176279 | 16/06/2022 | Bronze |
| LUPPITER BIDCO LIMITED | 13987703 | 18/03/2022 | Silver |
| LUPPITER CONSORTIUM LIMITED | 13987234 | 18/03/2022 | Bronze |
| MARK MATHIESON CONSULTING LTD | 09463686 | 27/02/2015 | Gold |
| MIRA CORE GAS LIMITED | FC034501 | 11/10/2018 | Bronze |
| MSCIF WIGHT BIDCO LIMITED | 13469990 | 22/06/2021 | One Red Flag |
| MSCIF WIGHT MIDCO LIMITED | 13468085 | 21/06/2021 | Bronze |
| NATIONAL GAS METERING LIMITED | 03705992 | 31/01/2023 | Silver |
| NATIONAL GAS TRANSMISSION HOLDINGS LIMITED | 03675375 | 31/01/2023 | Amber |
| NATIONAL GAS TRANSMISSION PLC | 02006000 | 31/01/2023 | Silver |
| NEOS INTEGRATION LIMITED | 03740932 | 17/12/2010 | Dissolved |
| QUADGAS HOLDCO LIMITED | 10614254 | 28/11/2018 | Amber |
| QUADGAS HOLDINGS TOPCO LIMITED | FC034104 | 29/01/2019 | Amber |
| QUADGAS INVESTMENTS BIDCO LIMITED | 10487004 | 29/01/2019 | Silver |
| QUADGAS MIDCO LIMITED | 10615396 | 28/11/2018 | Amber |
| QUADGAS PLEDGECO LIMITED | 10614954 | 28/11/2018 | Gold |
| SSE (NI) POWER DISTRIBUTION LIMITED | NI602832 | 19/04/2010 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ATLASCONNECT LIMITED | SC241790 | 17/12/2010 | 10/07/2014 | Not Trading |
| EA TECHNOLOGY LIMITED | 02566313 | 01/04/2010 | 11/06/2015 | Silver |
| ENERVEO LIMITED | 02317133 | 17/12/2010 | 16/04/2014 | Amber |
| FOREV LIMITED | SC581107 | 07/02/2019 | 03/12/2019 | Amber |
| GEOTHERMAL INTERNATIONAL LIMITED | 05397984 | 03/04/2008 | 21/12/2011 | Dissolved |
| GHH GROUP HOLDINGS LTD | SC540972 | 22/07/2016 | 19/05/2017 | Bronze |
| GREEN HIGHLAND RENEWABLES LTD | SC315779 | 04/08/2015 | 19/05/2017 | Gold |
| INDIGO PIPELINES LIMITED | 02742721 | 11/10/2005 | 27/02/2006 | Silver |
| NEOS NETWORKS LIMITED | SC213457 | 17/12/2010 | 10/07/2014 | Amber |
| NNXYZ LIMITED | 03477297 | 17/12/2010 | 10/07/2014 | Insolvent |
| ROROYERE HYDRO LTD | SC357527 | 04/09/2015 | 19/05/2017 | Silver |
| S + S LIMITED | SC214382 | 21/11/2007 | 12/12/2014 | Dissolved |
| SCOTTISH AND SOUTHERN ENERGY POWER DISTRIBUTION LIMITED | SC213459 | 21/11/2007 | 12/12/2014 | Gold |
| SCOTTISH HYDRO ELECTRIC POWER DISTRIBUTION PLC | SC213460 | 21/11/2007 | 12/12/2014 | Silver |
| SCOTTISH HYDRO ELECTRIC TRANSMISSION PLC | SC213461 | 21/11/2007 | 12/12/2014 | Bronze |
| SMART DCC LIMITED | 08641679 | 22/03/2018 | 01/04/2021 | Bronze |
| SOUTHERN ELECTRIC POWER DISTRIBUTION PLC | 04094290 | 21/11/2007 | 12/12/2014 | Silver |
| SOUTHERN WATER SERVICES LIMITED | 02366670 | 08/09/2021 | 31/10/2023 | Bronze |
| SSE CONTRACTING GROUP LIMITED | 02471438 | 19/09/2005 | 24/11/2014 | Silver |
| SSE HEAT NETWORKS LIMITED | SC303682 | 17/12/2010 | 03/06/2014 | Amber |
| SSE INTERCONNECTOR LIMITED | 06985529 | 17/08/2009 | 18/02/2011 | Dissolved |
| SSE UTILITY SERVICES LIMITED | 01689416 | 16/12/2004 | 12/12/2014 | Not Trading |
| SSE UTILITY SOLUTIONS LIMITED | 06894120 | 17/12/2010 | 24/11/2014 | One Red Flag |
| WINDER POWER HOLDINGS LIMITED | 08240305 | 27/05/2015 | 20/09/2017 | Bronze |