| Company | Timeline | Status | |
| Hawco & Sons Limited Director • Chairman | 2 Oct 2025←2 Months→Current | Active | |
| Race Against Dementia Director • Company Director | 20 Sep 2022←3 Years→Current | Active | |
| TPS Ecosse Limited Director • Chairman | 24 May 2022←3 Years→Current | Active | |
| Hgpca Limited Director • Director | 7 Apr 2015←7 Years→9 Feb 2023 | Active | |
| The Historic Grand Prix Cars Association Limited Director • Company Director | 20 Feb 2015←6 Years→14 Dec 2021 | Active | |
Ecurie Ecosse Young Driver Initiative Director • Director | 2 Dec 2014←5 Years→20 Oct 2020 | Dissolved | |
| Clark Commercials (Aberdeen) Limited Director • Chairman | 9 Jul 2008←17 Years→Current | Active | |
| Abbotswell Developments Limited Director • Chairman | 5 Nov 2007←18 Years→Current | Active | |
| Pentland Motor Company Limited Director • Chairman | 7 Nov 1997←28 Years→Current | Active | |
| John Clark (Properties) Limited Director • Chairman | 28 Apr 1989←36 Years→Current | Active | |
