| Company | Timeline | Status | |
| Project 94 Ltd Director • Director | 1 Sep 2022←3 Years→Current | Active | |
| Graphene Payment Solutions Limited Director • Director | 11 Sep 2020←2 Years→27 Sep 2022 | Dissolved | |
| Hydro-Gen Solutions Limited Director • Company Director | 12 Jun 2020←2 Years 6 Months→20 Dec 2022 | Dissolved | |
| RK Infrastructure Limited Director • Director | 8 Nov 2019←6 Years→Current | Active | |
| SP Group (London) Ltd Director • Director | 23 May 2019←6 Years→Current | Active | |
| Graphene Recruitment Group Ltd Director • Director | 6 Mar 2019←6 Years→Current | Active | |
| Project 94 Ltd Director • Director | 6 Apr 2018←4 Years→1 Sep 2022 | Active | |
Grant Walker Infrastructure Limited Director • Director | 11 Jul 2016←2 Years 5 Months→18 Dec 2018 | Dissolved | |
| Grant Walker Group Ltd Director • Electrician | 12 Mar 2015←10 Years→Current | Active | |
| Grant Walker Engineering Ltd Director • Director | 26 Sep 2012←13 Years→Current | Active | |
