- Chris, Mr. THOMAS- Born May 1979 - Bank Chambers 1-5 Wandsworth Road, London, United Kingdom, SW8 2LN 
- HARTMANN SINGLETON LIMITED- 05304901 - Incorporated on 6 December 2004 
- HARTMANN CONSULTANTS LIMITEDActive - Proposal to Strike off- 05519210 - Incorporated on 26 July 2005 
- HARTMANN SOLUTIONS LTD- 08359804 - Incorporated on 14 January 2013 
- HARTMANN TRAINING LTD- 10013449 - Incorporated on 18 February 2016 
- HARTMANN TRESORE LTDActive - Proposal to Strike off- 10280646 - Incorporated on 15 July 2016 
- HARTMANN YOUNG LIMITED- 10393002 - Incorporated on 26 September 2016 
- S.HARTMANN LIMITEDDisolved- 08427443 - Dissolved on 17 October 2023 
- HARTMANN (UK) LIMITED- 00734190 - Incorporated on 3 September 1962 
- HARTMANN INTERNATIONAL LIMITEDDisolved- 06813391 - Dissolved on 19 April 2022 
- HARTMANN CAPITAL LIMITEDIn Administration- 03918455 - Incorporated on 3 February 2000 
- HARTMANN ENTERTAINMENT LIMITED- SC168486 - Incorporated on 24 September 1996 
- HARTMANN KUECHEN LTD.Active - Proposal to Strike off- 07894378 - Incorporated on 30 December 2011 
- OLIVER HARTMANN LIMITEDActive - Proposal to Strike off- 08568628 - Incorporated on 13 June 2013 
- HARTMANN PROPERTIES LIMITEDDisolved- 10458746 - Dissolved on 6 May 2025 
- HARTMANN PRODUCTIONS LIMITED- 15641430 - Incorporated on 13 April 2024 
- HARTMANN ARCHITECTS LTD- 16013124 - Incorporated on 11 October 2024 
- PAUL HARTMANN LIMITED- 01523121 - Incorporated on 17 October 1980 
- HARTMANN MASON LIMITED- 06875010 - Incorporated on 9 April 2009 
- GEORG HARTMANN LIMITEDDisolved- 05296361 - Dissolved on 1 July 2025