| Company | Timeline | Status | |
| William Lee Limited Director • Director | 21 Apr 2018←7 Years→Current | Active | |
| Cook Rail Systems Limited Director • Operations Director | 25 Sep 2015←2 Years 6 Months→18 Apr 2018 | Active | |
| William Cook Leeds Limited Director • Operations Director | 1 Jul 2015←1 Year 4 Months→1 Nov 2016 | Active | |
| William Cook Cast Products Limited Director • Operations Director | 1 Jul 2015←2 Years 5 Months→30 Nov 2017 | Active | |
| William Cook Master Patterns Limited Director • Operations Director | 1 Jul 2015←2 Years 5 Months→30 Nov 2017 | Dissolved | |
| William Cook Integrity Limited Director • Operations Director | 1 Jul 2015←2 Years 5 Months→30 Nov 2017 | Dissolved | |
| William Cook Intermodal Limited Director • Operations Director | 1 Jul 2015←1 Year 4 Months→1 Nov 2016 | Active | |
| William Cook NDT Limited Director • Operations Director | 1 Jul 2015←2 Years 5 Months→30 Nov 2017 | Dissolved | |
| William Cook Precision Limited Director • Opperations Director | 1 Jul 2015←2 Years 5 Months→30 Nov 2017 | Dissolved | |
| William Cook Stanhope Limited Director • Operations Director | 1 Jul 2015←1 Year 4 Months→1 Nov 2016 | Active | |
