| Company | Timeline | Status | |
| Spi Appleton Limited Director • Finance Director | 13 Mar 2017←7 Years→30 Sep 2024 | Active | |
| Spi Piling Ltd Director • Finance Director | 1 Jan 2013←11 Years→30 Sep 2024 | Active | |
| Spi McGrattan Piling Limited Director • Finance Director | 28 Feb 2008←16 Years→30 Sep 2024 | Active | |
| A E Yates Directional Drilling Ltd Director • Accountant | 15 Aug 1995←24 Years→3 Jan 2020 | Active | |
| A E Yates Trenchless Solutions Limited Director • Accountant | 2 Aug 1995←10 Years→12 Jan 2006 | Active | |
| Oaklands Management Company Limited Director • Accountant | 11 Mar 1992←3 Years→6 Apr 1995 | Active | |
| Combined Soil Stabilisation Limited Director • Accountant/company Secretary | 31 Jan 1992←32 Years→30 Sep 2024 | Active | |
| Tritech Ground Engineering Ltd Director • Accountant/company Secretary | 10 Oct 1991←29 Years→26 May 2021 | Active | |
| J.C. Whitehead Limited Secretary • Unreported | 1 Oct 1991←32 Years→5 Mar 2024 | Dissolved | |
| A E Yates Limited Director • Accountant/company Secretary | 19 Feb 1991←33 Years→30 Aug 2024 | Active | |
