- QUADRILECT LIMITED- 02939410 - Incorporated on 15 June 1994 
- NUULIV (QUADRINGS) LTDActive - Proposal to Strike off- 09022539 - Incorporated on 2 May 2014 
- QUADRILIAN LIMITED- 11354027 - Incorporated on 10 May 2018 
- QUADRIGA CYBER CONSULTING LTD- 00628645 - Incorporated on 22 May 1959 
- MR & MRS S LTDActive - Proposal to Strike off- 12290244 - Incorporated on 30 October 2019 
- QUADRINGENTI LIMITED- 11979205 - Incorporated on 3 May 2019 
- QUADRIUM FINANCE LTD- 12418152 - Incorporated on 22 January 2020 
- QUADRIVIUM GAMES LTDDisolved- 13710691 - Dissolved on 10 October 2023 
- QUADRIC SERVICES LTD- 15813942 - Incorporated on 2 July 2024 
- QUADRISE KSA LIMITEDDisolved- 07347841 - Dissolved on 27 September 2022 
- QUADRILATERALS LIMITEDActive - Proposal to Strike off- 07737769 - Incorporated on 11 August 2011 
- QUADRIGA USA LIMITEDDisolved- 07761462 - Dissolved on 24 January 2025 
- QUADRIGA DESIGNS LTDDissolved- 08631982 - Dissolved on 9 July 2019 
- QUADRILATERALS LIMITED- 10963316 - Incorporated on 14 September 2017 
- QUADRING STORAGE LTD- 12449227 - Incorporated on 7 February 2020 
- QUADRIVIAL LIMITED- 15072856 - Incorporated on 15 August 2023 
- KMI QUADRING LIMITED- 12997265 - Incorporated on 4 November 2020 
- ANTIBIA LIMITED- 10206820 - Incorporated on 31 May 2016 
- QC PRIVATE EQUITY SERVICES LIMITED- 03787318 - Incorporated on 10 June 1999 
- SONDER SPORTS I LIMITED- 15564882 - Incorporated on 15 March 2024