- BLACKSTOCK PROPERTY SERVICES LTDDissolved- 10426170 - Dissolved on 5 February 2019 
- HART2HART MOBILITY LIMITED- 15098709 - Incorporated on 28 August 2023 
- RIDGEWAY ASSOCIATES LIMITEDActive - Proposal to Strike off- 04284833 - Incorporated on 11 September 2001 
- CERTLING LTD- 14949413 - Incorporated on 21 June 2023 
- HARTLAW (WETHERBY) LLPDissolved- OC303880 - Dissolved on 6 March 2007 
- HART 2 HART SAMEDAY COURIER LIMITED- 07854541 - Incorporated on 21 November 2011 
- M.J. HART HOMES LIMITED- 05035853 - Incorporated on 5 February 2004 
- D W HART & SON LTDLiquidation- 07974528 - Incorporated on 2 March 2012 
- HARTER LTDDissolved- 05122370 - Dissolved on 24 September 2019 
- HARTIE LTDDisolved- 12410220 - Dissolved on 17 June 2025 
- HARTWELL L.P.- SL006859 - Incorporated on 14 October 2008 
- HART BAR LTD- 10775789 - Incorporated on 17 May 2017 
- JJ HARTS LTDDisolved- 13594695 - Dissolved on 7 June 2022 
- YOU@HART LTD- 13119085 - Incorporated on 7 January 2021 
- HART2HART PROPERTY LIMITED- 15509216 - Incorporated on 21 February 2024 
- WHITE HART AT HARTLEBURY LTDActive - Proposal to Strike off- 15649929 - Incorporated on 15 April 2024 
- MICHAEL MICHAELS LIMITED- 03392932 - Incorporated on 26 June 1997 
- HART SERVICE MANAGEMENT LTDDissolved- 06690250 - Dissolved on 22 March 2011 
- HARTSLANE C.I.C.- 09524335 - Incorporated on 2 April 2015 
- HART PBR LTD- 16163812 - Incorporated on 5 January 2025