- IRWIN HOLDINGS LIMITED- 10239347 - Incorporated on 20 June 2016 
- IRWIN PIPING LIMITEDActive - Proposal to Strike off- 09715872 - Incorporated on 3 August 2015 
- IRWIN ACOUSTICS LIMITED- NI660234 - Incorporated on 1 April 2019 
- J.IRWIN DAVIS LIMITED- 00283326 - Incorporated on 4 January 1934 
- IRWINE SERVICES LTDDisolved- 11669482 - Dissolved on 14 May 2024 
- LEWIS IRWIN TYRES LTD- SC744126 - Incorporated on 12 September 2022 
- MS MEDICAL SERVICES (LEEDS) LIMITED- 13810768 - Incorporated on 21 December 2021 
- IRWIN TRANSPORT LTD- NI615074 
- THALAMUS IRWINE LTDDisolved- 13560990 - Dissolved on 5 April 2022 
- IRWIN RADIO PARTS LTDDisolved- 14773970 - Dissolved on 10 September 2024 
- IRWIN PLASTERING LIMITEDActive - Proposal to Strike off- 07856351 - Incorporated on 22 November 2011 
- IRWIN TECHNOLOGIES LIMITED- 06405616 - Incorporated on 22 October 2007 
- IRWIN CONSTRUCTION LIMITEDLiquidation- 03224964 - Incorporated on 15 July 1996 
- IRWIN FARMING LIMITED- 04941669 - Incorporated on 23 October 2003 
- IRWIN CONSULTING LTD- 08435739 - Incorporated on 8 March 2013 
- IRWIN HEALTHCARE LIMITEDActive - Proposal to Strike off- 09440891 - Incorporated on 16 February 2015 
- IRWIN COMPOSITES LTDActive - Proposal to Strike off- 10982221 - Incorporated on 26 September 2017 
- IRWIN CONSULTANTS LIMITED- 11983282 - Incorporated on 8 May 2019 
- IRWIN PROPERTIES LIMITED- NI638895 - Incorporated on 6 June 2016 
- IRWIN PHYSIO LIMITEDActive - Proposal to Strike off- 10323516 - Incorporated on 10 August 2016