| Company | Timeline | Status | |
| John O'Brien Removals Ltd Director • Property Developer | 19 Dec 2011←14 Years→Current | Active | |
| John O'Brien Estates Ltd Director • Builder | 5 Mar 2010←15 Years→Current | Active | |
| John O'Brien Construction Ltd Director • Director | 16 Jun 2009←16 Years→Current | Active | |
| K & J Estates Ltd Secretary • Unreported | 6 Oct 2008←17 Years→Current | Active | |
| John O'Brien Construction Ltd Secretary • Unreported | 6 Oct 2008←1 Year 2 Months→31 Dec 2009 | Active | |
| K & J Estates Ltd Secretary • Unreported | 25 Oct 2007←4 Months→29 Feb 2008 | Active | |
