- TADHG MCMAHON LIMITEDActive - Proposal to Strike off- 09019443 - Incorporated on 30 April 2014 
- MCMAHON MANAGEMENT LIMITEDActive - Proposal to Strike off- 09600601 - Incorporated on 20 May 2015 
- WHEATLEY MCMAHON LIMITED- 04342169 - Incorporated on 18 December 2001 
- MCMAHON DESIGN LIMITEDActive - Proposal to Strike off- 09065368 - Incorporated on 2 June 2014 
- MCMAHON SERVICES LTDActive - Proposal to Strike off- 10926703 - Incorporated on 22 August 2017 
- MCMAHON & PARTNERS LIMITED- 10091311 - Incorporated on 30 March 2016 
- MCMAHON ENFORCEMENT LTD- 12131277 - Incorporated on 31 July 2019 
- MCMAHON INFRASTRUCTURE LTDActive - Proposal to Strike off- 11218471 - Incorporated on 21 February 2018 
- JACKIE MCMAHON LIMITEDLiquidation- NI643640 - Incorporated on 6 February 2017 
- PATRICIA MCMAHON LTDDisolved- SC700611 - Dissolved on 20 December 2022 
- MCMAHON STUDIO LIMITEDDisolved- 15049052 - Dissolved on 4 February 2025 
- ANDREW MCMAHON LIMITED- NI717014 - Incorporated on 14 June 2024 
- MCMAHON MEDICAL LIMITED- NI729184 - Incorporated on 6 May 2025 
- MR & MRS S LTDActive - Proposal to Strike off- 12290244 - Incorporated on 30 October 2019 
- K. MCMAHON (SKIP HIRE) LIMITED- 04101131 - Incorporated on 2 November 2000 
- CITY RUNNER LOGISTICS LIMITEDActive - Proposal to Strike off- 09415614 - Incorporated on 31 January 2015 
- RODWELL-MCMAHON LTDDissolved- 07965076 - Dissolved on 1 October 2013 
- MALISSA MCMAHON LTDDisolved- 12989616 - Dissolved on 12 April 2022 
- IAN MCMAHON LIMITEDActive - Proposal to Strike off- 10585511 - Incorporated on 26 January 2017 
- MCMAHON TRADING LTDActive - Proposal to Strike off- 07919674 - Incorporated on 23 January 2012