| Company | Timeline | Status | |
| Grand View (Residential) Management Company Limited Director • Managing Director | 28 Feb 2025←8 Months→Current | Active | |
| O'Brien Energy Limited Director • Director | 14 Apr 2023←2 Years 6 Months→Current | Active | |
| O'Brien Holdings 2020 Limited Director • Director | 15 Feb 2020←5 Years→Current | Active | |
| Northend Management (Willows) Limited Director • Director | 5 Dec 2019←2 Years 3 Months→15 Mar 2022 | Active | |
| O'Brien Construct Limited Director • Director | 18 May 2018←5 Years→19 Sep 2023 | Dissolved | |
| Mill House Management (Southam) Limited Director • None | 19 Oct 2016←2 Years 1 Month→12 Dec 2018 | Active | |
| O'Brien Developments Dartmouth Waterside Limited Director • Director | 13 Jul 2016←9 Years→Current | Active | |
| O'Brien Developments Dartmouth Fish Hoek Limited Director • Director | 13 Jul 2016←9 Years→Current | Active | |
SMP Developments Limited Director • Director | 13 Jun 2016←1 Year 11 Months→15 May 2018 | Dissolved | |
| Southam Developments Limited Director • Director | 12 Apr 2016←9 Years→Current | Active | |
