| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| HIICEM RUGBY HOLDINGS LIMITED | 15637199 | 11/04/2024 | Amber |
| HIICEM RUGBY LIMITED | 15637626 | 11/04/2024 | Amber |
| HIIROC CARBON LIMITED | 15559774 | 13/03/2024 | Amber |
| HIIROC EGYPT LIMITED | 15064344 | 11/08/2023 | Bronze |
| HIIROC LIMITED | 11925215 | 14/11/2022 | Amber |
| HIIROC MENA HOLDINGS LIMITED | 15060247 | 09/08/2023 | Bronze |
| HIIROC UAE LIMITED | 15272901 | 09/11/2023 | Bronze |
| HIIROC UK LIMITED | 14260049 | 27/07/2022 | Silver |
| HIIROC-X DEVELOPMENTS LIMITED | 13327578 | 17/05/2021 | One Red Flag |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CO2DEEPSTORE (ASPEN) LIMITED | 07390231 | 22/06/2012 | 31/07/2013 | Dissolved |
| CO2DEEPSTORE LIMITED | SC319515 | 19/07/2012 | 31/07/2013 | Amber |
| ENQUEST DONS LIMITED | 03351775 | 31/12/2008 | 05/04/2010 | Dissolved |
| GATEWAY STORAGE COMPANY LIMITED | SC295137 | 03/01/2012 | 23/04/2014 | Dissolved |
| ITHACA ENERGY DEVELOPMENTS UK LIMITED | 07105041 | 15/12/2009 | 27/09/2012 | Bronze |
| PETROFAC (MALAYSIA-PM 304) LIMITED | 03418736 | 19/10/2010 | 20/09/2012 | Amber |