| Company | Timeline | Status | |
| The Society Of Authors Director • Solicitor | 16 Nov 2023←1 Year 11 Months→Current | Active | |
| The Crime Writers' Association Director • Solicitor And Writer | 20 May 2023←2 Years 5 Months→Current | Active | |
| NJ Matheson Limited Director • Writer | 20 Mar 2019←6 Years→Current | Active | |
Nadine Matheson Law Ltd Director • Solicitor | 3 Jun 2013←5 Years→30 Oct 2018 | Dissolved | |
Nadine Matheson Publishing Ltd Director • Solicitor | 6 Jun 2012←5 Years→8 Aug 2017 | Dissolved | |
| Big Splash Creative Limited Director • Law | 3 Feb 2011←14 Years→Current | Active | |
