- UNIQUE REBELS UNION LTD- 07799711 - Incorporated on 6 October 2011 
- T J O'NEILL LIMITEDDissolved- SC267286 - Dissolved on 9 October 2018 
- S.P O'NEILL LIMITED- 04173114 - Incorporated on 6 March 2001 
- C J O'NEILL LIMITEDDissolved- 04497946 - Dissolved on 25 January 2011 
- DAVID NEILL LTDActive - Proposal to Strike off- 04590549 - Incorporated on 14 November 2002 
- O'NEILL FUELS LTDActive - Proposal to Strike off- NI035600 - Incorporated on 16 February 1999 
- K J O'NEILL LIMITED- SC441294 - Incorporated on 28 January 2013 
- FOLEY O'NEILL LTD- 09182013 - Incorporated on 19 August 2014 
- P. G. O'NEILL LIMITEDDisolved- NI646724 - Dissolved on 31 January 2023 
- NEILL HOMES LTD- 12894861 - Incorporated on 21 September 2020 
- NEILL GROUP LTDDisolved- SC672812 - Dissolved on 27 June 2023 
- O'NEILL'S AUTOS LTDDisolved- 14230686 - Dissolved on 19 December 2023 
- BRIAN O NEILL LTDDisolved- NI691920 - Dissolved on 1 April 2025 
- NEILLTECH LTDDisolved- 14824747 - Dissolved on 8 October 2024 
- T&B NEILL LIMITED- 15903746 - Incorporated on 19 August 2024 
- CLARE O'NEILL LTD- 15915372 - Incorporated on 23 August 2024 
- M S NEILL LIMITED- 06908640 - Incorporated on 18 May 2009 
- O'NEILL H&S LIMITEDDisolved- SC477915 - Dissolved on 20 July 2021 
- D O'NEILL LIMITED- 08798579 - Incorporated on 2 December 2013 
- O'NEILL GROUP LTD- NI695701 - Incorporated on 24 March 2023