- QUINN BIM LTDActive - Proposal to Strike off- 08939126 - Incorporated on 14 March 2014 
- A.J AND QUINN LTDDisolved- 12817638 - Dissolved on 18 January 2022 
- QUINNIX LTDDisolved- 13679580 - Dissolved on 17 December 2024 
- QUINN.INC LTDDisolved- 15188612 - Dissolved on 11 March 2025 
- SMC KITCHENS & JOINERY LTD- SC652499 - Incorporated on 23 January 2020 
- PEITHO PEARLS LTD- 11142290 - Incorporated on 10 January 2018 
- M CONNORS LLPDissolved- OC315677 - Dissolved on 10 April 2007 
- QUINNEL LTD- 07571916 - Incorporated on 21 March 2011 
- IAN QUINN LTD- 08507907 - Incorporated on 29 April 2013 
- P QUINN & SON LTD- NI628069 - Incorporated on 28 November 2014 
- TJ O'CONNOR LTDDissolved- 11000644 - Dissolved on 2 July 2019 
- PJ O'CONNOR LTDDisolved- NI645537 - Dissolved on 11 January 2022 
- O'CONNORS LLP- OC305740 - Incorporated on 8 October 2003 
- NJ CONNOR LTD- SC540732 - Incorporated on 21 July 2016 
- D. T. CONNOR & CO. LTD- 13448562 - Incorporated on 10 June 2021 
- MF CONNOR LTDActive - Proposal to Strike off- 13798579 - Incorporated on 13 December 2021 
- OD CONNOR LTDDisolved- 14112038 - Dissolved on 6 February 2024 
- HAMILL'S SAUL LIMITED- NI643533 - Incorporated on 31 January 2017 
- QUINN ACCOUNTANCY SERVICES LIMITED- 15632861 - Incorporated on 10 April 2024 
- QUINNELL & CO- LP004619 - Incorporated on 20 April 1994