| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| HDF (UK) HOLDINGS LIMITED | 05462865 | 10/09/2024 | Bronze |
| KELLEN ACQUISITIONS LIMITED | 05366060 | 09/12/2013 | Dissolved |
| Phoenix Natural Gas Ltd | FC016812 | 20/11/2002 | Dissolved |
| Phoenix Natural Gas Ltd | FC016812 | 23/12/2003 | Dissolved |
| SOUTH EAST WATER LIMITED | 02679874 | 15/08/2024 | One Red Flag |
| THE BALLYCLARE HIGH SCHOOL FOUNDATION LTD | NI685284 | 25/01/2022 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BELFAST ENERGY LIMITED | NI032808 | 15/12/2005 | 15/06/2023 | Not Trading |
| BELFAST GAS TRANSMISSION LIMITED | NI026420 | 23/12/2003 | 31/03/2008 | Amber |
| BELFAST NATURAL GAS LIMITED | NI032807 | 15/12/2005 | 15/06/2023 | Not Trading |
| HEATHMOUNT MANAGEMENT COMPANY LIMITED | NI053630 | 29/03/2008 | 25/03/2022 | Not Trading |
| LIONRAI INVESTMENTS NO.1 LIMITED | 08611798 | 09/12/2013 | 15/06/2023 | Amber |
| LIONRAI INVESTMENTS NO.2 LIMITED | 08612000 | 09/12/2013 | 15/06/2023 | Bronze |
| PHOENIX ENERGY GROUP LTD | NI032809 | 15/12/2005 | 30/03/2010 | Bronze |
| PHOENIX ENERGY HOLDINGS LIMITED | 04135896 | 14/12/2005 | 06/02/2018 | Bronze |
| PHOENIX ENERGY SERVICES LIMITED | NI041410 | 23/08/2001 | 06/02/2018 | Gold |
| PHOENIX ENERGY SERVICES LIMITED | NI041410 | 24/08/2001 | 15/06/2023 | Gold |
| PHOENIX GAS LIMITED | NI032765 | 15/12/2005 | 15/06/2023 | Not Trading |
| PHOENIX NATURAL GAS PP FINANCE PLC | 10636561 | 23/02/2017 | 15/06/2023 | Bronze |
| PHOENIX POWER LIMITED | NI032766 | 14/12/2005 | 15/06/2023 | Not Trading |
| PNG STORAGE LIMITED | NI056219 | 14/12/2005 | 15/06/2023 | Not Trading |
| PNG STORAGE LIMITED | NI056219 | 15/12/2005 | 15/06/2023 | Not Trading |
| SSE AIRTRICITY GAS SUPPLY (NI) LIMITED | NI032810 | 14/12/2005 | 22/06/2012 | Silver |
| SSE AIRTRICITY GAS SUPPLY (NI) LIMITED | NI032810 | 15/12/2005 | 29/03/2007 | Silver |