| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| TETRA TECH INTERNATIONAL DEVELOPMENT BV | FC034786 | 03/03/2020 | 22/03/2024 | Bronze |
| TETRA TECH INTERNATIONAL DEVELOPMENT EUROPE LIMITED | 04120956 | 02/03/2017 | 22/03/2024 | Silver |
| TETRA TECH INTERNATIONAL DEVELOPMENT LIMITED | 03799145 | 10/02/2017 | 22/03/2024 | One Red Flag |
| TETRA TECH INTERNATIONAL DEVELOPMENT PROJECTS LIMITED | 03195423 | 03/03/2020 | 22/03/2024 | Silver |
| TETRA TECH UK HOLDINGS LIMITED | 05909611 | 20/03/2017 | 22/03/2024 | Gold |
| TETRA TECH UK LIMITED | 12241404 | 03/10/2019 | 22/03/2024 | Silver |