| Company | Timeline | Status | |
| Piteau Associates UK Limited Director • Unreported | 24 May 2022←3 Years→Current | Active | |
| Tetra Tech International Development Projects Limited Director • Unreported | 3 Mar 2020←5 Years→Current | Active | |
| Tetra Tech Consulting (Ni) Limited Director • Unreported | 24 Jan 2020←5 Years→Current | Active | |
| Tetra Tech Group Limited Director • Unreported | 15 Jan 2020←5 Years→Current | Active | |
| Tetra Tech UK Limited Director • Unreported | 3 Oct 2019←6 Years→Current | Active | |
| Tetra Tech UK Consulting Group Limited Director • Unreported | 9 Jul 2019←6 Years→Current | Active | |
