- KRISTINE MONAGHAN LTD- 14034573 - Incorporated on 8 April 2022 
- MONAGHAN JOINERY LTDDisolved- SC739119 - Dissolved on 26 December 2023 
- MONAGHAN ACADEMY LTDActive - Proposal to Strike off- 15527578 - Incorporated on 27 February 2024 
- MONAGHAN REINSTATEMENTS LTDDisolved- SC822847 - Dissolved on 17 June 2025 
- MONAGHANS LIMITED- 06455453 - Incorporated on 17 December 2007 
- MONAGHAN EVENTS LTD- 16418681 - Incorporated on 29 April 2025 
- MONAGHAN UTILITIES LIMITEDDisolved- 14480718 - Dissolved on 23 April 2024 
- FRANCIS MONAGHAN LTD- 15120139 - Incorporated on 6 September 2023 
- MONAGHAN BROTHERS LIMITED- NI047832 - Incorporated on 6 September 2003 
- RAY MONAGHAN LIMITEDDissolved- 06780815 - Dissolved on 12 June 2018 
- MONAGHAN MUSHROOMS LIMITED- 04949651 - Incorporated on 31 October 2003 
- MONAGHAN CONSULTING LIMITEDLiquidation- 07101393 - Incorporated on 10 December 2009 
- MONAGHAN CONSULTANTS LIMITED- 03331267 - Incorporated on 11 March 1997 
- MONAGHAN SURFACING LIMITEDActive - Proposal to Strike off- 07896248 - Incorporated on 4 January 2012 
- MONAGHAN DEVELOPMENTS LIMITED- 03202477 - Incorporated on 22 May 1996 
- MONAGHAN LOGISTICS LIMITED- 09350898 - Incorporated on 11 December 2014 
- VICTORIA MONAGHAN LIMITEDActive - Proposal to Strike off- 10868256 - Incorporated on 17 July 2017 
- MONAGHAN LANDSCAPING LIMITED- 09984853 - Incorporated on 3 February 2016 
- MONAGHAN MARTIN LIMITED- 12369599 - Incorporated on 18 December 2019 
- MONAGHAN DISTRIBUTION LTDDisolved- 12454163 - Dissolved on 17 August 2021