| Company | Timeline | Status | |
| Brisbane Observatory Trust Director • Trustee | 3 Dec 2020←5 Years→Current | Active | |
| Kirkwood Brothers Ltd Director • Director | 18 Oct 2019←6 Years→Current | Active | |
| North Ayrshire Ventures Trust Director • Managing Director | 17 Jun 2015←10 Years→Current | Active | |
| Scottish Building Federation Director • Company Director | 12 Feb 2009←16 Years→Current | Active | |
| Destination Largs Limited Secretary • Unreported | 10 Nov 2006←19 Years→30 Dec 2025 | Dissolved | |
| Constructive Architectural Design Limited Director • Company Director | 24 Jun 2004←21 Years→Current | Active | |
| System Five Off-Site Ltd Director • Managing Director | 16 Dec 2002←23 Years→Current | Active | |
| Sharphill Timber Supply Company Limited Director • Managing Director | 16 Dec 2002←23 Years→Current | Active | |
| Robertryan Homes Limited Director • Construction Director | 23 Aug 2000←25 Years→Current | Active | |
| Robertryan Timber Engineering Limited Director • Construction Director | 11 Sep 1998←27 Years→Current | Active | |
