| Company | Timeline | Status | |
| O'Brien Consultancy (SW) Limited Director • Healthcare Manager | 10 Feb 2021←4 Years→Current | Active | |
| O'Brien Holdings (Devon) Limited Director • Unreported | 21 Jun 2007←18 Years→Current | Active | |
| O'Brien Fore Street Limited Director • Unreported | 19 Jun 2007←18 Years→Current | Active | |
| O'Brien Limited Director • Unreported | 15 Nov 1995←30 Years→Current | Active | |
