| Company | Timeline | Status | |
| Sigma Procurement Services Ltd Director • Company Director | 27 May 2008←16 Years→13 Aug 2024 | Dissolved | |
| Sigma Project Management Services Ltd Director • Company Director | 23 May 2008←16 Years→13 Aug 2024 | Dissolved | |
| Sigma Rail Ltd Director • Company Director | 23 May 2008←16 Years→13 Aug 2024 | Dissolved | |
| Sigma Quantity Surveying Services Ltd Director • Company Director | 23 May 2008←16 Years→13 Aug 2024 | Dissolved | |
| Sigma Project Controls Ltd Director • Company Director | 23 May 2008←16 Years→13 Aug 2024 | Dissolved | |
| Sigma Surveying Services Limited Director • Unreported | 19 Jun 2006←19 Years→Current | Active | |
