- M.HALLORAN SERVICES LTD.Active - Proposal to Strike off- 09293145 - Incorporated on 3 November 2014 
- DECLAN CAHILL LTD- 07440517 - Incorporated on 16 November 2010 
- ANN HALLORAN LIMITED- 09341053 - Incorporated on 4 December 2014 
- MATT O'HALLORAN HAULAGE LIMITED- 12883290 - Incorporated on 16 September 2020 
- DECLAN MCGRATH LTDDissolved- 08041998 - Dissolved on 24 September 2013 
- DECLAN BROOKES LTD- 11348728 - Incorporated on 8 May 2018 
- DECLAN MCKENNA LTDActive - Proposal to Strike off- SC606502 - Incorporated on 29 August 2018 
- DECLAND LIMITEDActive - Proposal to Strike off- 05333600 - Incorporated on 17 January 2005 
- DECLAN MURPHY LTD- 14283080 - Incorporated on 8 August 2022 
- DECLAN STOR LIMITEDDisolved- 14696163 - Dissolved on 28 May 2024 
- DECLAN MCMULLAN LTD- NI701965 - Incorporated on 18 September 2023 
- DECLAN MCLAUGHLIN LTD- NI613990 - Incorporated on 13 August 2012 
- DECLAN MCGRANE LIMITEDActive - Proposal to Strike off- 08969693 - Incorporated on 1 April 2014 
- DECLAN CARR LIMITEDDisolved- 09204183 - Dissolved on 24 January 2023 
- DECLAN ENGINEERING LTDDisolved- 13889864 - Dissolved on 25 April 2023 
- HALLORAN CREATIVE LTD- 16420315 - Incorporated on 30 April 2025 
- O'HALLORAN PROPERTY DEVELOPMENT LTDActive - Proposal to Strike off- 08921386 - Incorporated on 4 March 2014 
- O’HALLORAN TRANSPORT LTD- 14471904 - Incorporated on 9 November 2022 
- O’HALLORAN LOGISTICS LTD- 16503013 - Incorporated on 8 June 2025 
- O`HALLORAN SERVICES LTDDissolved- 07042428 - Dissolved on 5 October 2010