| Company | Timeline | Status | |
| Diploma Overseas Limited Director • Unreported | 16 May 2019←6 Years→Current | Active | |
| Diploma Holdings Plc Director • Unreported | 16 May 2019←6 Years→Current | Active | |
| Diploma Australia Holdings Limited Director • Director | 16 May 2019←1 Year 5 Months→2 Nov 2020 | Active | |
| Diploma Canada Holdings Limited Director • Director | 16 May 2019←1 Year 5 Months→2 Nov 2020 | Active | |
| Diploma UK Holdings Limited Director • Director | 16 May 2019←1 Year 5 Months→2 Nov 2020 | Active | |
| Diploma Europe Holdings Limited Director • Director | 16 May 2019←1 Year 5 Months→2 Nov 2020 | Active | |
| Newlandglebe Limited Director • Director | 16 May 2019←1 Year 5 Months→2 Nov 2020 | Active | |
| Williamson, Cliff Limited Director • Director | 16 May 2019←1 Year 5 Months→2 Nov 2020 | Active | |
| Diploma Plc Director • Unreported | 25 Feb 2019←6 Years→Current | Active | |
