- M T HAY LTDDisolved- SC608541 - Dissolved on 5 March 2024 
- HAY MODELS LTDActive - Proposal to Strike off- 11687160 - Incorporated on 20 November 2018 
- HAY ARCHITECTS LIMITED- 11740901 - Incorporated on 24 December 2018 
- HAY TAKEAWAY LTD- 09873740 - Incorporated on 16 November 2015 
- EDDIE HAY LIMITED- SC523559 - Incorporated on 6 January 2016 
- EL-HAY LTDDisolved- 10100881 - Dissolved on 23 January 2024 
- HAY PRO LIMITEDActive - Proposal to Strike off- 11408077 - Incorporated on 11 June 2018 
- PAUL HAY LTDActive - Proposal to Strike off- 11497390 - Incorporated on 2 August 2018 
- HAY CONSTRUCTION LIMITEDActive - Proposal to Strike off- 11558730 - Incorporated on 7 September 2018 
- HAY GOLPES LTD- 11570900 - Incorporated on 17 September 2018 
- HAY HOMES LTDActive - Proposal to Strike off- 12689628 - Incorporated on 22 June 2020 
- MALCOLM HAY LTDDissolved- SC304279 - Dissolved on 25 November 2011 
- HAY CHEF LIMITED- 11928210 - Incorporated on 5 April 2019 
- HAY SUPERMARKET LTDDisolved- SC630255 - Dissolved on 3 December 2024 
- DOUGLAS HAY LTDDisolved- 12295461 - Dissolved on 5 July 2022 
- CAMAMILE & HAY LIMITED- 07280480 - Incorporated on 10 June 2010 
- T.G. HAY LIMITED- SC143417 - Incorporated on 24 March 1993 
- HAY CONSULTING LTDDisolved- SC239060 - Dissolved on 21 May 2024 
- HAY FARM LTD.- SC241218 - Incorporated on 16 December 2002 
- HAY MATHEWSON LLPLiquidation- OC336950 - Incorporated on 29 April 2008