- DAVID HARRIS ENTERPRISES LTDDisolved- 14556279 - Dissolved on 28 May 2024 
- DAVID HARRIS COMMUNICATIONS LIMITEDDissolved- 03619514 - Dissolved on 6 September 2011 
- LUKE DAVID HARRIS LIMITEDLiquidation- 12017151 - Incorporated on 24 May 2019 
- DAVID HARRIS INTERNATIONAL LIMITED- 01582648 - Incorporated on 26 August 1981 
- DAVID HARRIS ASSOCIATES LIMITED- 03942995 - Incorporated on 8 March 2000 
- DAVID HARRIS DERMATOLOGY LLP- OC384588 - Incorporated on 22 April 2013 
- DAVID HARRIS & ASSOCIATES LIMITEDDissolved- 07008437 - Dissolved on 26 April 2011 
- DAVID HARRIS INSTALLATIONS LIMITEDActive - Proposal to Strike off- 01870117 - Incorporated on 10 December 1984 
- DAVID HARRISON LIMITED- SC031753 - Incorporated on 18 September 1956 
- NEIL HARRISON CONFERENCES LTDDissolved- 03890894 - Dissolved on 21 May 2013 
- NEIL HARRISON CONSULTING LTD- 15851681 - Incorporated on 22 July 2024 
- HARRIS DAVIDSON LIMITEDDissolved- 09662058 - Dissolved on 13 December 2016 
- NEIL HARRISON COURIER LIMITEDActive - Proposal to Strike off- 08324479 - Incorporated on 10 December 2012 
- DAVID NEILSON CONSULTANCY LTD- SC430060 - Incorporated on 9 August 2012 
- NEIL DAVID SMITH ENGINEERING LIMITEDDisolved- 07500426 - Dissolved on 15 February 2022 
- DAVID O'NEILL LOGISTICS LIMITEDActive - Proposal to Strike off- 10342358 - Incorporated on 23 August 2016 
- DAVID O'NEIL CONSULTING LIMITED- 16415208 - Incorporated on 29 April 2025 
- DAVID HARRISON & SONS LIMITED- 01287828 - Incorporated on 24 November 1976 
- DAVID J HARRIS PROPERTIES LTD- 13090022 - Incorporated on 18 December 2020 
- NEIL DAVIDSON MEDICAL LIMITED- 09365539 - Incorporated on 23 December 2014