| Company | Timeline | Status | |
| Studio William Welch Limited Director • Manager | 23 Mar 2007←18 Years→Current | Active | |
| William Welch Design Limited Director • Sales And Marketing | 6 Mar 2006←19 Years→Current | Active | |
| William Welch Design Limited Secretary • Unreported | 6 Mar 2006←19 Years→Current | Active | |
| Studio William Welch Limited Secretary • Unreported | 22 Nov 2005←19 Years→Current | Active | |
| William Welch Limited Secretary • Unreported | 20 Jul 2005←20 Years→Current | Active | |
