| Company | Timeline | Status | |
| William Cook Integrity Limited Director • Chartered Accountant | 2 Jul 2021←2 Years 3 Months→24 Oct 2023 | Dissolved | |
| Cook Rail Systems Limited Director • Accountant | 9 Jun 2021←3 Years→12 Jul 2024 | Active | |
| William Cook Master Patterns Limited Director • Chartered Accountant | 10 Jun 2020←1 Year→10 Jun 2021 | Dissolved | |
| William Cook NDT Limited Director • Chartered Accountant | 13 May 2020←9 Months→27 Feb 2021 | Dissolved | |
| William Cook Precision Limited Director • Chartered Accountant | 13 May 2020←11 Months→11 Apr 2021 | Dissolved | |
| Weardale Investments Limited Director • Company Director | 16 Jan 2020←4 Years→24 Apr 2024 | Active | |
| Chesterfield Metal Technologies Limited Director • Company Director | 16 Jan 2020←4 Years→24 Apr 2024 | Active | |
| William Cook Rail Limited Director • Director | 28 Mar 2018←6 Years→24 Apr 2024 | Active | |
| William Cook Intermodal Limited Director • Director | 28 Mar 2018←6 Years→24 Apr 2024 | Active | |
| William Cook Stanhope Limited Director • Director | 28 Mar 2018←6 Years→24 Apr 2024 | Active | |
