- P. IRWIN LIMITEDActive - Proposal to Strike off- 05014549 - Incorporated on 13 January 2004 
- IRWIN FUTURES- 16495899 - Incorporated on 4 June 2025 
- MR GEORGE LIU PRACTICE LIMITED- 13633748 - Incorporated on 21 September 2021 
- H. IRWIN LIMITED- 04740383 - Incorporated on 22 April 2003 
- IRWIN SMITH LTD- 05751883 - Incorporated on 22 March 2006 
- PRICE IRWIN LTDDisolved- 08355647 - Dissolved on 13 August 2019 
- K.G IRWIN LIMITEDActive - Proposal to Strike off- 10244913 - Incorporated on 22 June 2016 
- LEE IRWIN MSS LTDDisolved- 15355144 - Dissolved on 30 April 2024 
- MR CHRISTOPHER GEORGE KNAPP LIMITEDDisolved- 14383933 - Dissolved on 5 March 2024 
- B. & J. IRWIN LIMITEDActive - Proposal to Strike off- 06311011 - Incorporated on 12 July 2007 
- IRWIN AUTOS LTDDissolved- NI072936 - Dissolved on 6 September 2013 
- STEVE IRWIN LTDDisolved- 06064716 - Dissolved on 25 October 2022 
- LINDA IRWIN LTDActive - Proposal to Strike off- 08721107 - Incorporated on 7 October 2013 
- SIMON IRWIN LTDActive - Proposal to Strike off- 10979409 - Incorporated on 25 September 2017 
- IRWIN TYRES LTD- NI648703 - Incorporated on 17 October 2017 
- IRWIN LEWIS LTD- NI684974 - Incorporated on 13 January 2022 
- IRWIN JAMES LTD- 15475466 - Incorporated on 9 February 2024 
- IRWIN BLAKE LTD- 13765576 - Incorporated on 25 November 2021 
- J L KEWELL LTD- 03160741 - Incorporated on 16 February 1996 
- IRWIN M&E LIMITED- NI036731 - Incorporated on 18 August 1999