| Company | Timeline | Status | |
| McQuillan Companies Limited Director • Company Director | 28 Feb 2024←1 Year 8 Months→Current | Active | |
| McQuillan Quarries Ltd Director • Company Director | 10 Oct 2022←3 Years→Current | Active | |
| McQuillan Developments Limited Director • Company Director | 10 Oct 2022←3 Years→Current | Active | |
| Patterson Outdoor Cleaning Solutions Limited Director • Company Director | 16 Nov 2009←15 Years→Current | Active | |
| McQuillan Envirocare Limited Director • Company Director | 16 Nov 2009←15 Years→Current | Active | |
| Edentrillick Quarries Limited Director • Company Director | 16 Nov 2009←15 Years→Current | Active | |
| McQuillan (Skip Hire) Limited Director • Company Director | 16 Nov 2009←15 Years→Current | Active | |
| John McQuillan (Contracts) Limited Director • Contracts Director | 1 Sep 2002←23 Years→Current | Active | |
| John McQuillan (Contracts) Limited Director • Contracts Director | 1 Oct 1999←1 Year 9 Months→30 Jun 2001 | Active | |
