| Company | Timeline | Status | |
| Northstone Limited Director • Corporate Development Director | 29 Apr 2001←2 Years 8 Months→31 Dec 2003 | Active | |
| Aggregates (Ulster) Limited Director • Corporate Development Director | 29 Apr 2000←3 Years→31 Dec 2003 | Dissolved | |
| Portrush Columnar Basalt Company Limited-The Director • Corporate Development Director | 29 Apr 2000←3 Years→31 Dec 2003 | Dissolved | |
| Dunbrik (Ulster) Limited Director • Corporate Development Director | 29 Apr 2000←3 Years→31 Dec 2003 | Dissolved | |
| Northstone Quarries Limited Director • Corporate Development Director | 29 Apr 2000←3 Years→31 Dec 2003 | Dissolved | |
Northstone (Group) Limited Director • Corporate Development Director | 29 Apr 2000←3 Years→31 Dec 2003 | Dissolved | |
| John Finlay (Concrete Pipes) Limited Director • Director | 25 Nov 1999←26 Years→Current | Active | |
| Northstone Concrete Supplies Limited Director • Company Secretary | 8 May 1996←7 Years→31 Dec 2003 | Dissolved | |
| Northstone Concrete Limited Director • Company Secretary & Corporate | 21 Mar 1996←7 Years→31 Dec 2003 | Dissolved | |
| Northstone Products Limited Director • Company Secretary & Corporate | 21 Mar 1996←7 Years→31 Dec 2003 | Active | |
