| Company | Timeline | Status | |
| Fleet House Management (Upnor) Ltd Director • Property Developer | 5 Jun 2025←6 Months→Current | Active | |
| Greystone Management (Borden) Limited Director • Director | 5 Oct 2022←3 Years→13 Nov 2025 | Active | |
| Byrne Developments Ltd Director • Company Director | 27 Feb 2021←4 Years→Current | Active | |
| Ashbyrne Homes Ltd Director • Director | 19 Feb 2016←9 Years→Current | Active | |
| Sheerness Golf Club Limited Director • Contracts Manager | 22 Sep 2002←23 Years→Current | Active | |
| J. Byrne Plant Hire & Civil Engineering Limited Director • Company Director | 6 Apr 1999←26 Years→Current | Active | |
| Byrne Contractors Limited Director • Company Director | 19 Jun 1991←34 Years→Current | Active | |
