| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| HALLIBURTON ENERGY SERVICES LIMITED | SC231879 | 01/11/2021 | Dissolved |
| HALLIBURTON HOLDINGS (NO. 3) | SC231927 | 01/11/2021 | Dissolved |
| HML TRUSTEES LIMITED | SC244164 | 02/10/2017 | Not Trading |
| PETRIS TECHNOLOGY, LTD. | 05453198 | 01/11/2021 | Dissolved |
| PSL ENERGY SERVICES LIMITED | SC243706 | 01/11/2021 | Silver |
| ROCKWATER LIMITED | 01268625 | 01/11/2021 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BUE SHIPS LIMITED | 01525618 | 01/11/2021 | 25/10/2024 | Gold |
| HALLIBURTON GLOBAL HOLDINGS LIMITED | 08794280 | 01/11/2021 | 25/10/2024 | Gold |
| HALLIBURTON INVESTMENTS AFRICA LTD | 15950303 | 11/09/2024 | 25/10/2024 | Amber |
| HALLIBURTON LANDMARK HOLDINGS UK LIMITED | 11436807 | 01/11/2021 | 25/10/2024 | Gold |
| HALLIBURTON LIMITED | 00978424 | 01/11/2021 | 25/10/2024 | Gold |
| HALLIBURTON MANAGEMENT LIMITED | SC232078 | 01/11/2021 | 25/10/2024 | Bronze |
| HALLIBURTON MANUFACTURING AND SERVICES LIMITED | 00611451 | 01/11/2021 | 25/10/2024 | Silver |
| HALLIBURTON UK INVESTMENTS II LTD | 16115462 | 03/12/2024 | 11/12/2024 | Amber |
| HALLIBURTON UK INVESTMENTS LTD | 15868540 | 31/07/2024 | 25/10/2024 | Amber |
| LANDMARK EAME, LTD. | 01937155 | 01/11/2021 | 25/10/2024 | Bronze |
| MEDITERRANEAN ENERGY SERVICES LIMITED | SC232077 | 01/11/2021 | 25/10/2024 | Silver |
| NEFTEX PETROLEUM CONSULTANTS LIMITED | 04220557 | 01/11/2021 | 25/10/2024 | Silver |
| PROTECH CENTREFORM INTERNATIONAL LIMITED | SC252217 | 01/11/2021 | 25/10/2024 | Silver |
| SUB SEA OFFSHORE LIMITED | 01385206 | 01/11/2021 | 25/10/2024 | Gold |
| WELLDYNAMICS INTERNATIONAL LIMITED | SC145181 | 01/11/2021 | 25/10/2024 | Silver |