- O'REILLY STEWART LIMITED- NI609494 - Incorporated on 14 October 2011 
- AIDAN O'REILLY LIMITEDDissolved- 05529429 - Dissolved on 31 December 2019 
- O'REILLY & ASSOCIATES LIMITED- 06730475 - Incorporated on 22 October 2008 
- O'REILLY CONSULTING LIMITED- 03034995 - Incorporated on 20 March 1995 
- O'REILLY SOLUTIONS LIMITEDActive - Proposal to Strike off- 09635254 - Incorporated on 11 June 2015 
- O'REILLY BUILDERS LIMITED- 08493256 - Incorporated on 17 April 2013 
- ADAMS O'REILLY LIMITED- 09982324 - Incorporated on 2 February 2016 
- O'REILLY CONSTRUCTION LTD.- 10194046 - Incorporated on 23 May 2016 
- O'REILLY HOLDINGS LIMITED- 11113518 - Incorporated on 15 December 2017 
- P O'REILLY LIMITED- 10653283 - Incorporated on 6 March 2017 
- REBECCA O'REILLY LIMITEDActive - Proposal to Strike off- 11617175 - Incorporated on 11 October 2018 
- O'REILLY MEDICAL LTD- 13301387 - Incorporated on 29 March 2021 
- PETER O'REILLY LTDDisolved- 14906593 - Dissolved on 19 September 2023 
- O'REILLY STONEMASONS LTD- NI724664 - Incorporated on 16 December 2024 
- REILLY ICS LTD- 14539481 - Incorporated on 13 December 2022 
- O'REILLY AGENCIES LIMITEDActive - Proposal to Strike off- 07132652 - Incorporated on 21 January 2010 
- K O'REILLY LIMITEDDisolved- 06256593 - Dissolved on 9 August 2022 
- HETHERINGTON O'REILLY LLPActive - Proposal to Strike off- OC352856 - Incorporated on 4 March 2010 
- O'REILLY HAWES LIMITED- 07812180 - Incorporated on 17 October 2011 
- TAYLOR O'REILLY LIMITEDDissolved- 07073134 - Dissolved on 28 June 2011