| wcs environmental limited | £21.2m | £124.7m | Nov 2023 | - | Open | Director |
| hydro-x water treatment limited | £19.2m | £76.8m | Nov 2023 | - | Open | Director |
| santia asbestos management limited | £4.1m | £34.9m | Nov 2023 | - | Open | Director |
| tersus consultancy limited | £29.6m | £26m | Nov 2023 | - | Open | Director |
| hydro-x air limited | £9.8m | £16.9m | Nov 2023 | - | Open | Director |
| clearwater technology ltd | £15.8m | £14.8m | Nov 2023 | - | Open | Director |
| sterling hydrotech limited | £8.6m | £13.8m | Nov 2023 | - | Open | Director |
| wcs services limited | £13.3m | £13.2m | Nov 2023 | - | Open | Director |
| clearwater group limited | - | £10.8m | Nov 2023 | - | Open | Director |
| guardian water treatment ltd | £11.2m | £8.8m | Nov 2023 | - | Open | Director |
| wcs environmental engineering ltd | £5.4m | £8.4m | Nov 2023 | - | Open | Director |
| atana ltd | £7.8m | £4.9m | Nov 2023 | - | Open | Director |
| wcs environmental south east ltd | £4.4m | £4.4m | Nov 2023 | - | Open | Director |
| hydro-x group limited | - | £4.1m | Nov 2023 | - | Open | Director |
| pcs asbestos consultants limited | £1.5m | £4m | Nov 2023 | - | Open | Director |
| hydro-x training limited | £1.8m | £2.2m | Nov 2023 | - | Open | Director |
| n-ov8 group limited | £336.4k | £924.4k | Nov 2023 | - | Open | Director |
| kingfisher environmental services limited | £989k | £497.3k | Nov 2023 | - | Open | Director |
| phase technology limited | £1.2m | £465.1k | Nov 2023 | - | Open | Director |
| phase technology 2gen holdings limited | £309.8k | £309k | Nov 2023 | - | Open | Director |
| sterling hydrotech holdings limited | £309.8k | £309k | Nov 2023 | - | Open | Director |
| santia construction management limited | £287.7k | £182.9k | Nov 2023 | - | Open | Director |
| santia access solutions limited | £407.3k | £124.7k | Nov 2023 | - | Open | Director |
| phase technology (holdings) limited | £200.4k | £90.2k | Nov 2023 | - | Open | Director |
| hydro-x engineering limited | £126.8k | £66.3k | Nov 2023 | - | Open | Director |
