- BI HART LTDDisolved- 13489716 - Dissolved on 21 March 2023 
- SB HART LTD- 13346645 - Incorporated on 20 April 2021 
- MI HART LTDActive - Proposal to Strike off- 13974283 - Incorporated on 14 March 2022 
- SQ HART LTDActive - Proposal to Strike off- 13976290 - Incorporated on 15 March 2022 
- TR HART LTDActive - Proposal to Strike off- 14082029 - Incorporated on 3 May 2022 
- HART QA LTDDisolved- SC749273 - Dissolved on 8 July 2025 
- EL HART LTD- 15788524 - Incorporated on 19 June 2024 
- DS HART LTD- 15862492 - Incorporated on 29 July 2024 
- HARTS LLPActive - Proposal to Strike off- OC314166 - Incorporated on 15 July 2005 
- HART ST LTD- 07948476 - Incorporated on 14 February 2012 
- H B HART & CO LLPActive - Proposal to Strike off- OC368084 - Incorporated on 15 September 2011 
- K J HARTE LTD- 11090446 - Incorporated on 30 November 2017 
- HART TM LTDActive - Proposal to Strike off- 11531642 - Incorporated on 22 August 2018 
- LE HART LTD- 12379174 - Incorporated on 30 December 2019 
- BA HART LTDDisolved- 13957384 - Dissolved on 13 February 2024 
- HART TM LTD- 15697103 - Incorporated on 30 April 2024 
- E K HARTE LTD- 15329350 - Incorporated on 5 December 2023 
- HARTY LTD- 06751974 - Incorporated on 18 November 2008 
- HART & CO. LTD.- SC418901 - Incorporated on 7 March 2012 
- BO HART LTD- 12130050 - Incorporated on 30 July 2019