| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| HMS CAROLINE (NORTHERN IRELAND) TRUST LIMITED | NI625152 | 12/06/2014 | Dissolved |
| HMS TRINCOMALEE (1817) ENTERPRISE COMPANY LIMITED | 06096831 | 01/09/2017 | Dissolved |
| HMS TRINCOMALEE TRADING LIMITED | 08971687 | 01/09/2017 | Dissolved |
| MARITIME ARCHAEOLOGY SEA TRUST | 07455580 | 11/01/2024 | One Red Flag |
| PORTSMOUTH HISTORIC DOCKYARD | 02790922 | 31/07/2012 | Dissolved |
| ROYAL SCHOOL OF NEEDLEWORK(THE) | 00012192 | 04/05/2023 | Silver |
| RSN ENTERPRISES LIMITED | 03158058 | 13/07/2023 | One Red Flag |
| THE WELLINGTON TRUST | 05343257 | 17/01/2024 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| NMRN OPERATIONS | 09988314 | 04/02/2016 | 30/11/2023 | Silver |
| NMRN SERVICES | 08843356 | 13/01/2014 | 01/12/2023 | Not Trading |
| ROYAL MARINES MUSEUM | 07635447 | 16/05/2011 | 01/12/2023 | Not Trading |
| UNICORN PRESERVATION SOCIETY (THE) | SC046145 | 12/06/2013 | 20/02/2014 | Bronze |
| WARRIOR PRESERVATION TRUST LIMITED | 00936870 | 01/04/2017 | 30/11/2023 | Silver |