| Company | Timeline | Status | |
| OBS Management Services Limited Director • Director | 2 Feb 2021←1 Day→2 Feb 2021 | Active | |
| O'Brien Building Services Limited Director • Unreported | 26 Nov 2015←10 Years→Current | Active | |
| 17 Thirlmere Road Freehold Limited Director • Plasterer | 1 Sep 2014←8 Months→30 Apr 2015 | Active | |
| O'Brien (Oxford) Limited Director • Director | 19 Dec 2006←18 Years→Current | Active | |
| O'Brien Interiors Limited Director • Director | 24 Mar 2004←21 Years→Current | Active | |
