- KEVIN WS LTD- 16294418 - Incorporated on 5 March 2025 
- ALEXANDER IRWIN LTDDissolved- 07596878 - Dissolved on 20 November 2012 
- STRADLING & IRWIN LTDDissolved- 07541819 - Dissolved on 8 October 2013 
- VICTOR IRWIN & SONS LTD.- NI627780 - Incorporated on 12 November 2014 
- IRWIN BUILDERS LIMITED- 03330948 - Incorporated on 10 March 1997 
- MCINTYRE IRWIN LIMITEDDisolved- 03139029 - Dissolved on 1 April 2025 
- IRWIN MITCHELL LIMITED- 06789204 - Incorporated on 12 January 2009 
- IRWIN SOLUTIONS LIMITEDActive - Proposal to Strike off- 07208429 - Incorporated on 30 March 2010 
- IRWIN INSTALLATIONS LTD- 07658983 - Incorporated on 6 June 2011 
- DARREN IRWIN LIMITEDLiquidation- 06162740 - Incorporated on 15 March 2007 
- IRWIN CLARKE LIMITEDDissolved- 05976341 - Dissolved on 30 April 2013 
- IRWIN & ASSOCIATES LIMITED- 09655705 - Incorporated on 24 June 2015 
- IRWIN SECURITY LIMITED- NI617102 
- IRWIN COMPOSITES LTDActive - Proposal to Strike off- 09393024 - Incorporated on 16 January 2015 
- IRWIN AVIATION LIMITEDActive - Proposal to Strike off- 12080769 - Incorporated on 2 July 2019 
- IRWIN INVESTMENTS LTD- 13902261 - Incorporated on 8 February 2022 
- IRWIN EDITORIAL LIMITED- 13509780 - Incorporated on 14 July 2021 
- IRWIN SENIOR LIMITEDActive - Proposal to Strike off- 14528525 - Incorporated on 7 December 2022 
- IRWIN NEUROPSYCHOLOGY LIMITED- 16187546 - Incorporated on 16 January 2025 
- KEVINI LTDDisolved- SC482425 - Dissolved on 18 January 2022