| Company | Timeline | Status | |
| Spreng Thomson Holdings Limited Director • Company Director | 17 Jun 2024←1 Year 4 Months→Current | Active | |
| Johnston McGraith Ltd Director • Company Director | 6 Mar 2024←1 Year 8 Months→Current | Active | |
| Spreng Thomson Limited Director • Company Director | 1 Apr 2017←8 Years→Current | Active | |
| Spreng & Co. Limited Director • Company Director | 20 Jun 2012←12 Years→14 Jan 2025 | Dissolved | |
| Johnston Consulting Limited Director • Consultant | 15 Feb 2010←14 Years→14 May 2024 | Dissolved | |
