- A N IRWIN FEEDS LTD- NI026554 - Incorporated on 8 May 1992 
- IRWIN CLARK LTDActive - Proposal to Strike off- 10339766 - Incorporated on 22 August 2016 
- I. F LETS LIMITEDActive - Proposal to Strike off- 06961076 - Incorporated on 14 July 2009 
- IRWIN AUTO IT LTD- 07293642 - Incorporated on 23 June 2010 
- S IRWIN LIMITED- NI665874 - Incorporated on 18 November 2019 
- ELLIE IRWIN LTDDisolved- 10165421 - Dissolved on 20 August 2024 
- KEVIN KEVIN LIMITED- 14672068 - Incorporated on 17 February 2023 
- IRWIN MANAGEMENT LTDActive - Proposal to Strike off- 09818157 - Incorporated on 9 October 2015 
- 6 ST. MARGARETS PLACE LIMITED- 02699723 - Incorporated on 24 March 1992 
- JUSTIN IRWIN LTD- 06718179 - Incorporated on 8 October 2008 
- IRWIN INVEST LLP- OC388205 - Incorporated on 1 October 2013 
- JB IRWIN LIMITED- 11566544 - Incorporated on 13 September 2018 
- RA IRWIN 2019 LIMITED- NI663943 - Incorporated on 27 August 2019 
- PD IRWIN LIMITED- 15636317 - Incorporated on 11 April 2024 
- IRWIN & CO LIMITED- 08907841 - Incorporated on 24 February 2014 
- JOANNE IRWIN LTD- NI730114 - Incorporated on 4 June 2025 
- MULLACH GLAS THREE LIMITED- NI001415 - Incorporated on 6 December 1939 
- LUKE IRWIN PROPERTY LIMITED- 06801582 - Incorporated on 26 January 2009 
- IRWINWOODS LTD- NI604497 - Incorporated on 20 September 2010 
- J IRWIN & CO LIMITEDActive - Proposal to Strike off- 09547040 - Incorporated on 16 April 2015