- LANGDON & WAVERLEY LTDLiquidation- 10262953 - Incorporated on 5 July 2016 
- TONY LANGDON LIMITED- 01237432 - Incorporated on 15 December 1975 
- LANGDON SYSTEMS LIMITEDDisolved- 01912934 - Dissolved on 14 December 2021 
- LANGDON PARTNERSHIP LIMITED- 07987968 - Incorporated on 13 March 2012 
- BEN LANGDON LIMITED- 07552233 - Incorporated on 4 March 2011 
- LANGDON ENTERPRISES LIMITED- 04215094 - Incorporated on 11 May 2001 
- CHRIS LANGDON LIMITED- 04478573 - Incorporated on 5 July 2002 
- DAVIS LANGDON SERVICESLiquidation- 02864831 - Incorporated on 21 October 1993 
- LANGDON CONSULTANCY LIMITED- 08853493 - Incorporated on 21 January 2014 
- LANGDON CAPITAL LIMITEDActive - Proposal to Strike off- 09288895 - Incorporated on 30 October 2014 
- LANGDON TRUSTEE COMPANY- 08342169 - Incorporated on 28 December 2012 
- LANGDON ROWE LIMITEDActive - Proposal to Strike off- 08398982 - Incorporated on 12 February 2013 
- LANGDON DEVELOPMENTS LTD- 10507750 - Incorporated on 2 December 2016 
- LANGDON HOLDINGS LTD- 12116143 - Incorporated on 22 July 2019 
- LANGDON CONSULTANCY LTDDissolved- 12151673 - Dissolved on 6 July 2021 
- LANGDON TECHNOLOGIES LTD- 14909328 - Incorporated on 1 June 2023 
- LANGDON PROPERTY LTD- 14598230 - Incorporated on 17 January 2023 
- KILTIE LANGDON LIMITED- SC794280 - Incorporated on 6 January 2024 
- LANGDON GREEN LIMITED- 15441572 - Incorporated on 25 January 2024 
- OT SOLUTIONS U.K. LIMITEDDissolved- 07287121 - Dissolved on 22 May 2018