- IRWIN IT LIMITEDActive - Proposal to Strike off- 12201626 - Incorporated on 11 September 2019 
- DJW EDUCATION LIMITED- 01297739 - Incorporated on 9 February 1977 
- EI INVESTMENTS LIMITED- 12336531 - Incorporated on 27 November 2019 
- MADAME PHO ST.ANNES LTD- NI710571 - Incorporated on 23 February 2024 
- WILLIAM IRWIN LTD- NI706844 - Incorporated on 20 December 2023 
- IRWIN CAR SALES LTD- NI711863 - Incorporated on 15 March 2024 
- IRWIN LEASING LTD- 05014460 - Incorporated on 13 January 2004 
- J IRWIN WELDING LTDDissolved- 09077534 - Dissolved on 1 May 2018 
- KELRIS PROPERTY GROUP LTD- 15261883 - Incorporated on 6 November 2023 
- IRWIN PIPING UK LTDActive - Proposal to Strike off- 10992992 - Incorporated on 3 October 2017 
- IRWIN&PADGETT LTDActive - Proposal to Strike off- 11192604 - Incorporated on 7 February 2018 
- NICK IRWIN HAIR LTD- 13663467 - Incorporated on 5 October 2021 
- IRWIN'S TEA LIMITED- SC770244 - Incorporated on 23 May 2023 
- S.R.IRWIN.IMAGING LTD- 16180925 - Incorporated on 13 January 2025 
- IRWIN ESTATES LTD- 08521486 - Incorporated on 9 May 2013 
- ZOE IRWIN LIMITEDActive - Proposal to Strike off- 07193566 - Incorporated on 17 March 2010 
- MULLACH GLAS TWO LIMITED- NI017249 - Incorporated on 15 February 1984 
- IRWIN SYSTEMS LTD- 04182287 - Incorporated on 19 March 2001 
- J IRWIN CAR SALES LTD- NI629560 - Incorporated on 23 February 2015 
- IRWIN FISHERS LTD- 12782896 - Incorporated on 31 July 2020