- DONAL O'HALLORAN LIMITEDDisolved- 07564248 - Dissolved on 24 September 2024 
- O'HALLORAN PLUMBING LIMITEDActive - Proposal to Strike off- 10903620 - Incorporated on 7 August 2017 
- O'HALLORAN INVESTMENTS LTDDisolved- 13463614 - Dissolved on 31 October 2023 
- O'HALLORAN ELECTRICAL LTD- SC762590 - Incorporated on 16 March 2023 
- DECLAN JAMES LTD- 07061939 - Incorporated on 30 October 2009 
- DECLANMULHERNPROPERTIES LTD- 15001653 - Incorporated on 13 July 2023 
- WRIGLEY DEVELOPMENTS LTDDissolved- 05050407 - Dissolved on 16 June 2015 
- DECLAN PAIGE LTD- 06174292 - Incorporated on 21 March 2007 
- DECLANMOFFET LTDLiquidation- 09278656 - Incorporated on 24 October 2014 
- DECLAN CRAIG LTDDisolved- SC686268 - Dissolved on 21 June 2022 
- DECLAN QUINN LTD- NI673284 - Incorporated on 9 October 2020 
- DECLAN TOMAN LTDDisolved- 13036226 - Dissolved on 26 April 2022 
- DECLAN BURLEY LTD- 14908645 - Incorporated on 1 June 2023 
- DR. DECLAN O'KEEFFE- NI605375 - Incorporated on 3 December 2010 
- DECLAN DAVEY LTD.- 11760267 - Incorporated on 10 January 2019 
- DECLAN ROCHE LTDDisolved- 15676363 - Dissolved on 22 July 2025 
- Michael Damien, Mr Michael O'HALLORAN- Born February 1965 - 28 Tylney Avenue, London, United Kingdom, SE19 1LN 
- TRADING CAPITAL FX LTDActive - Proposal to Strike off- SC657618 - Incorporated on 17 March 2020 
- DP ELECTRICAL SERVICES LIMITED- SC767849 - Incorporated on 1 May 2023 
- DECLAN STOREY LTD- 11890695 - Incorporated on 19 March 2019