| 2THELOO UK Limited | Wholesale & retail | 2014 |
| 2THENTH Limited | Administrative & support | 1986 |
| 2THETOP Ltd | Wholesale & retail | 2026 |
| 2THINK Digital Marketing Ltd | Wholesale & retail | 2019 |
| 2THREE5 Solutions Ltd | Professional & scientific | 2024 |
| 2TIMES Solar Limited | Professional & scientific | 2024 |
| 2TK Properties Ltd | Real estate | 2022 |
| 2TO1 Carers Ltd | Health & social care | 2023 |
| 2TR Football Ltd | Arts & recreation | 2012 |
| 2TRACKIT Smart Solutions Ltd | Information & communication | 2023 |
| 2TTEL Limited | Information & communication | 2013 |
| 2TUFFMANAGEMENT Ltd | Information & communication | 2024 |
| 2TURNT Ltd | Manufacturing | 2025 |
| 2TWENTY2 Aesthetics Ltd | Other services | 2025 |
| 2TWENTY4 Ltd | Manufacturing | 2025 |
| 2U Dental Ltd | Health & social care | 2025 |
| 2U Getsmarter (UK) Limited | Education | 2017 |
| 2U Group (UK) Limited | Education | 2018 |
| 2UL Ltd | Information & communication | 2024 |
| 2UNLIMITED Limited | Hospitality | 2014 |
| 2UP3DN Ltd | Information & communication | 2025 |
| 2V Holdings Limited | Financial services | 2016 |
| 2V Projects Ltd | Construction | 2022 |
| 2VEELS Ltd | Wholesale & retail | 2025 |
| 2VICTORY Limited | Wholesale & retail | 2025 |
| 2VINYL Limited | Information & communication | 2025 |
| 2VM Consulting Limited | Information & communication | 2016 |
| 2WAI (UK) Limited | Professional & scientific | 2025 |
| 2WAY Studios Ltd | Information & communication | 2026 |
| 2WAYZ Services Limited | Real estate | 2019 |
| 2WENTY One Ltd | Wholesale & retail | 2023 |
| 2WGM (Management Company) Limited | Households | 2017 |
| 2WH Ltd | Real estate | 2015 |
| 2WILD Events Ltd | Arts & recreation | 2023 |
| 2WINS Digital Ltd | Administrative & support | 2022 |
| 2WINTHEBALL Limited | Arts & recreation | 2025 |
| 2WO 5IVE Properties Ltd | Real estate | 2023 |
| 2WORK Agency LLP | | 2018 |
| 2WOS Ltd | Wholesale & retail | 2023 |
| 2WOTIMES Entertainment Limited | Hospitality | 2025 |
| 2WRLDS Ltd | Information & communication | 2018 |
| 2WTRADE LLP | | 2015 |
| 2WW Pathway Ltd | Health & social care | 2025 |
| 2X Advertising Ltd | Professional & scientific | 2023 |
| 2X Global Limited | Other services | 2021 |
| 2X Ignite Limited | Financial services | 2024 |
| 2X Solutions Ltd | Arts & recreation | 2025 |
| 2X10 Limited | Wholesale & retail | 2018 |
| 2X2 Ltd | Information & communication | 2023 |
| 2XL Aviation Ltd | Transport & logistics | 2022 |
| 2XL Capital Partners Ltd | Professional & scientific | 2020 |
| 2XMA Architecture Ltd | Professional & scientific | 2021 |
| 2XN Limited | Professional & scientific | 2017 |
| 2XPRESSO Ltd | Professional & scientific | 2025 |
| 2XROI Ltd | Professional & scientific | 2024 |
| 2XU UK Limited | Wholesale & retail | 2014 |
| 2Y3X Accelerator Limited | Other services | 2021 |
| 2Y3X Consulting (UK) Limited | Professional & scientific | 2020 |
| 2YG Consultants Ltd | Information & communication | 2025 |
| 2ZEMOON&BACK LLP | | 2023 |
| 2ZORO Consulting Ltd | Information & communication | 2021 |
| 3 a Electrical Ltd | Construction | 2017 |
| 3 & 4 Martineau Road Limited | Real estate | 2000 |
| 3 & 4 Warwick Square Freehold Limited | Households | 2010 |
| 3 & 5 Cadogan Gardens (Management) Limited | Households | 1981 |
| 3 1 Fibres Ltd | Manufacturing | 2020 |
| 3 2 WON Limited | Arts & recreation | 2011 |
| 3 @ 50 Limited | Households | 2003 |
| 3 A'S Properties Limited | Real estate | 2024 |
| 3 A.M. Creative Limited | Arts & recreation | 2020 |
| 3 Acland Road Ltd | Real estate | 2021 |
| 3 Advice Limited | Real estate | 2022 |
| 3 Albany Freehold Limited | Households | 2016 |
| 3 Albert Street (Freehold) Limited | Households | 2012 |
| 3 Alder Road Limited | Households | 2018 |
| 3 Alderbrook Road Freehold Limited | Real estate | 2016 |
| 3 Alexandra Grove Ltd | Real estate | 2005 |
| 3 Alfred Road Management Limited | Households | 2013 |
| 3 Alpha Properties Ltd | Real estate | 2026 |
| 3 Amigos Artisan Spirits Limited | Wholesale & retail | 2019 |
| 3 and 4 Hamlet Close Limited | Real estate | 2022 |
| 3 and a Half Geniuses Ltd | Professional & scientific | 2014 |
| 3 Anerley Hill Management Co. Limited | Administrative & support | 1990 |
| 3 Ashbourne Avenue Limited | Households | 2014 |
| 3 AUK (London) Ltd | Hospitality | 2019 |
| 3 Aylesford House Ltd | Real estate | 2023 |
| 3 Bagss Limited | Wholesale & retail | 2024 |
| 3 Baker's ROW LLP | | 2012 |
| 3 Bala JEE Ltd | Hospitality | 2025 |
| 3 Barkston Gardens RTM Company Limited | Households | 2012 |
| 3 Barton Road Freehold Company Limited | Households | 2022 |
| 3 Beams Property Limited | Administrative & support | 2025 |
| 3 Bears Payroll Consultancy Ltd | Professional & scientific | 2025 |
| 3 BED House Ltd | Real estate | 2018 |
| 3 Belsize Avenue Company Ltd | Real estate | 2010 |
| 3 Benbow Road Management Limited | Households | 1976 |
| 3 Bennett Park Limited | Hospitality | 1990 |
| 3 Berners Street Limited | Households | 2006 |
| 3 Best Friends Limited | Professional & scientific | 2012 |
| 3 Bird Real Estate Limited | Real estate | 2025 |