- MADDOX HARTMANN ADVISORY LIMITEDDisolved- 08218009 - Dissolved on 4 March 2024 
- HEIN-HARTMANN DESIGNERS LTDActive - Proposal to Strike off- 12231109 - Incorporated on 27 September 2019 
- HARTMANN CAPITAL NOMINEES LIMITED- 06591777 - Incorporated on 13 May 2008 
- MR.MR. LTDDisolved- 14252327 - Dissolved on 5 December 2023 
- MR MR2 LTD- 11218539 - Incorporated on 21 February 2018 
- HARTMANNS BOOKS LIMITED- 15705305 - Incorporated on 7 May 2024 
- MR & MR LTD- 16489396 - Incorporated on 2 June 2025 
- MR MR LTDActive - Proposal to Strike off- 15533685 - Incorporated on 1 March 2024 
- HARTMANN DIENSTLEISTUNGEN INT. LIMITEDDisolved- 12405070 - Dissolved on 26 December 2023 
- GLOBAL SOLUTIONS CONSULTING LTD.- SC615099 - Incorporated on 30 November 2018 
- HARTMANN HOSPITALITY CO LTDDisolved- 11502217 - Dissolved on 3 August 2021 
- WOLFGANG HARTMANN BAUHANDELSVERTRETUNG LTD.- 05918640 - Incorporated on 29 August 2006 
- MICHELE HARTMANN STUDIOS LIMITEDActive - Proposal to Strike off- 09184575 - Incorporated on 21 August 2014 
- HARTMANNSSON CONSULTING LTD- 08810303 - Incorporated on 11 December 2013 
- MR&MRS B'S LTDDissolved- 10677155 - Dissolved on 20 August 2019 
- MR&MRS LTDActive - Proposal to Strike off- 12389034 - Incorporated on 7 January 2020 
- DLP DERIVATIVES LLPActive - Proposal to Strike off- OC354152 - Incorporated on 15 April 2010 
- MR & MRS O LTD.Active - Proposal to Strike off- SC217464 - Incorporated on 29 March 2001 
- MR & MRS W LTD- 08480767 - Incorporated on 9 April 2013 
- MR&MRS LTDActive - Proposal to Strike off- 10922002 - Incorporated on 18 August 2017