- NIALL O'BRIEN LTDActive - Proposal to Strike off- 09567046 - Incorporated on 29 April 2015 
- NIALL C LTD- 15812137 - Incorporated on 1 July 2024 
- NIALL LTD- 14713616 - Incorporated on 7 March 2023 
- NANJ INSTALLATION WORKS LTD- SC534806 - Incorporated on 9 May 2016 
- PAIN FREE PLUMBING LTD- 09639256 - Incorporated on 15 June 2015 
- NIALLMC LTD- 14362562 - Incorporated on 16 September 2022 
- NIALL RAIL LTD.Disolved- 13064028 - Dissolved on 29 March 2022 
- NIALL SHAW LTD- 16442492 - Incorporated on 11 May 2025 
- NIALL WARD LTD- NI658030 - Incorporated on 2 January 2019 
- G & S O'BRIEN- SL003500 - Incorporated on 26 April 1999 
- NIALL FOODS LTDActive - Proposal to Strike off- 13690611 - Incorporated on 20 October 2021 
- NIALL CARS LTD- 05373842 - Incorporated on 23 February 2005 
- DIAL A NIALL LTDDissolved- 06364283 - Dissolved on 11 September 2013 
- NIALL-LORI LTDDisolved- SC574960 - Dissolved on 3 August 2021 
- NIALL BELL LTD- NI728795 - Incorporated on 22 April 2025 
- NIALL O'HAGAN LTD- NI704692 - Incorporated on 14 November 2023 
- NIALL SCOTT LTD- 08454117 - Incorporated on 21 March 2013 
- NIALL SMITH 1974 LTDDisolved- 08563381 - Dissolved on 21 November 2023 
- NIALLS FARM LTD- SC537518 - Incorporated on 8 June 2016 
- ARES NIALL CO LTD- 15754726 - Incorporated on 1 June 2024