| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ANGLO DUTCH MARINE CONTRACTORS LIMITED | 07585127 | 30/03/2011 | Dissolved |
| Allantone Supplies Ltd | 00952355 | 02/01/1996 | Dissolved |
| Cyrene Ltd | 05889527 | 02/08/2006 | Dissolved |
| G.P.S MARINE HOLDINGS LIMITED | 06467166 | 08/01/2008 | Silver |
| GPS MARINE FACILITIES LTD | 11549566 | 03/09/2018 | Bronze |
| GPSM DIVECO PROPERTY LIMITED | 11156499 | 18/01/2018 | Dissolved |
| GPSM SILTTEK LTD | 08424823 | 28/02/2013 | Dissolved |
| General Port Services Ltd | 02517837 | 22/03/1996 | Dissolved |
| THOMAS WATSON (SHIPPING) LIMITED | 03686580 | 19/12/2007 | Dissolved |
| THOMAS WATSON (SHIPPING) LIMITED | 03686580 | 19/12/2007 | Dissolved |
| U K Dredging & Reclamation Ltd | 02393716 | 28/04/1998 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| DIVECO MARINE LTD | 08622179 | 24/07/2013 | 16/01/2019 | Gold |
| DIVECO RAIL LIMITED | 11434913 | 01/10/2018 | 16/01/2019 | Dissolved |
| GPSM HOLDINGS LTD | 11615057 | 10/10/2018 | 30/11/2018 | Dissolved |
| MEDWAY BARGE COMPANY LIMITED | 09929922 | 24/12/2015 | 20/06/2017 | Silver |
| THAMES MARINE ACADEMY LIMITED | 10720075 | 11/04/2017 | 10/03/2022 | One Red Flag |
| Victory Plant Hire Ltd | 03929794 | 21/02/2000 | 16/08/2001 | Dissolved |
| Victory Port Services Ltd | 03975933 | 18/04/2000 | 16/08/2001 | Dissolved |