| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| NORECO PETROLEUM (UK) LIMITED | 06613184 | 03/04/2013 | Dissolved |
| Safe Subsea Marine Ltd | 02413826 | 10/06/2000 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BLUENORD ENERGY UK LTD. | 03629582 | 03/04/2013 | 02/10/2014 | One Red Flag |
| CIRCLE OFFSHORE LIMITED | SC194986 | 12/12/2006 | 20/05/2010 | Silver |
| DNO EXPLORATION UK LIMITED | SC487108 | 01/12/2015 | 28/06/2017 | Bronze |
| DNO NORTH SEA PLC | 04622251 | 28/01/2019 | 11/05/2020 | Amber |
| G M ENGINEERING LIMITED | SC143734 | 14/03/2008 | 15/03/2010 | Dissolved |
| IKM TESTING UK LIMITED | 03467183 | 29/04/2000 | 15/08/2005 | Silver |
| PROSERV (NORTH SEA) LIMITED | SC335703 | 28/11/2008 | 20/05/2010 | Dissolved |
| PROSERV OFFSHORE LIMITED | SC235199 | 12/12/2006 | 20/05/2010 | Dissolved |
| PROSERV PROPERTIES LIMITED | SC092950 | 28/11/2008 | 20/05/2010 | Dissolved |
| PROSERV UK LIMITED | SC122029 | 28/11/2008 | 20/05/2010 | Silver |
| TYTAN (JETTING) LIMITED | SC205512 | 29/12/2006 | 20/05/2010 | Dissolved |