- J M MCKAY LIMITEDDissolved- SC339358 - Dissolved on 17 July 2018 
- L.A. MCKAY LIMITEDDissolved- 05587894 - Dissolved on 12 January 2010 
- MCKAYZS PVT LTDActive - Proposal to Strike off- 09592007 - Incorporated on 14 May 2015 
- ANITA MCKAY LLPDisolved- OC420138 - Dissolved on 11 June 2024 
- KEITH MCKAY LTD- 04963177 - Incorporated on 13 November 2003 
- MCKAY'S BITSS LTDDisolved- 13993263 - Dissolved on 22 August 2023 
- MCKAY AUTOS LTDDisolved- 14627771 - Dissolved on 25 March 2025 
- MCKAY COMMS LTD- SC844422 - Incorporated on 8 April 2025 
- CCI BELFAST LTD- NI050749 - Incorporated on 25 May 2004 
- MCKAY ESTATE LLP- OC335127 - Incorporated on 27 February 2008 
- MCKAY SAFETY LTDActive - Proposal to Strike off- 11647653 - Incorporated on 29 October 2018 
- MCKAYINSULATION LTDActive - Proposal to Strike off- SC602806 - Incorporated on 17 July 2018 
- EB MCKAY LIMITED- 10962860 - Incorporated on 14 September 2017 
- MCKAY MOTORS LTDDissolved- 12299375 - Dissolved on 22 June 2021 
- MCKAY & FAMILY LTD- SC360949 - Incorporated on 10 June 2009 
- HAYTER&MCKAY LTDActive - Proposal to Strike off- SC618009 - Incorporated on 14 January 2019 
- MCKAYSBITS LTDDisolved- 13236122 - Dissolved on 9 August 2022 
- MCKAY & POCOCK LTD- 16362903 - Incorporated on 3 April 2025 
- MCKAY HEALTHCARE LTD- 07770174 - Incorporated on 12 September 2011 
- GRIEVE & MACKAY LIMITEDActive - Proposal to Strike off- SC369723 - Incorporated on 7 December 2009