| Company | Timeline | Status | |
| Tetra Tech Europe Executive Services Limited Director • Director | 3 Jul 2025←5 Months→Current | Active | |
| Tetra Tech UK Limited Director • Director | 16 Dec 2024←11 Months→Current | Active | |
| Tetra Tech UK Holdings Limited Director • Director | 11 Dec 2024←12 Months→Current | Active | |
| RPS Trustees Limited Director • Director | 21 Nov 2024←1 Year→Current | Active | |
| Nautilus Limited Director • Director | 19 Nov 2024←1 Year→Current | Liquidation | |
| RPS Occupational Health Limited Director • Director | 29 Nov 2023←11 Months→30 Oct 2024 | Active | |
| Aquaterra International Limited Director • Director | 2 Nov 2023←2 Years 1 Month→Current | Active | |
| RPS Group Us Holdings Limited Director • Director | 2 Nov 2023←1 Year 2 Months→31 Dec 2024 | Dissolved | |
| R P S Group Limited Director • Director | 2 Nov 2023←2 Years 1 Month→Current | Active | |
| Tetra Tech RPS Energy Consultants Limited Director • Director | 2 Nov 2023←8 Months→9 Jul 2024 | Active | |
