| Company | Timeline | Status | |
| Preston Pools Limited Director • Engineer | 14 Mar 2019←6 Years→Current | Active | |
| Preston Properties Limited Director • Engineer | 27 Jan 2012←13 Years→Current | Active | |
| Pte Limited Director • Engineer | 12 Aug 2009←5 Years→31 Aug 2014 | Liquidation | |
| John Preston Pool & Spa Services Limited Director • Engineer | 17 Sep 1999←22 Years→24 Jun 2022 | Dissolved | |
