| Teal Barn Builds Ltd | Real estate | 2025 |
| Technosmart Ltd | Information & communication | 2023 |
| TFR Contract Services Limited | Construction | 2012 |
| THE Beauty Bar Wigan Ltd | Other services | 2022 |
| THE Crypto Collective Ltd | Other services | 2024 |
| THE Grand Plan Consultancy Limited | Professional & scientific | 2005 |
| THE HUT W3 Ltd | Hospitality | 2018 |
| THE Little Venice PUB Company Limited | Hospitality | 2009 |
| THE Local Teachers Ltd | Education | 2015 |
| THE Property People Organisation Limited | Professional & scientific | 2024 |
| THE School of Dental Nursing Ltd | Education | 2017 |
| THE Vale Management (London) Ltd | Real estate | 2013 |
| THE Wellness Therapist Ltd | Health & social care | 2022 |
| Ticketsom Ltd | Administrative & support | 2025 |
| TM London Services Ltd | Real estate | 2021 |
| TO the Point Plumbing Limited | Construction | 2019 |
| Toki Trading Company Limited (the) | | 1979 |
| Tony's Pizzas Ltd | Hospitality | 2023 |
| Trainigo Ltd | Education | 2023 |
| Tronflow Limited | Construction | 1982 |
| Ugenie Ltd | Information & communication | 2016 |
| Umoxi Corp Ltd | Administrative & support | 2018 |
| Undercover Brothers Ltd | Financial services | 2015 |
| Unilateral Ltd | Hospitality | 2020 |
| Uplift Africa Ltd | Wholesale & retail | 2020 |
| US Technology Ltd | Wholesale & retail | 2015 |
| Valid Security Solutions Ltd | Administrative & support | 2018 |
| VGD TV Limited | Information & communication | 2006 |
| Vriezemanagement Ltd | Professional & scientific | 2024 |
| W12 Auto Ltd | Manufacturing | 2021 |
| W3 Experiences Ltd | Real estate | 2016 |
| W3 Holistic Ltd | Other services | 2018 |
| Waseda Academy UK Co., Ltd | Education | 2019 |
| Weddai 2 Ltd | Administrative & support | 2026 |
| Weddai Ltd | Administrative & support | 2026 |
| WEM & Co Business Services Limited | Professional & scientific | 1999 |
| West Acton Sports Management Ltd | Wholesale & retail | 2026 |
| Whisks Star Ltd | Administrative & support | 2017 |
| Wisdom State of Mind Ltd | Information & communication | 2019 |
| Wise Birds Network Limited | Extraterritorial | 2017 |
| Without-Wax Ltd | Information & communication | 2012 |
| Wittywaves Studio Ltd | Professional & scientific | 2024 |
| Y Haffar Holding Limited | Financial services | 2020 |
| YCC Ltd | Hospitality | 2004 |
| Younger Smith Limited | Construction | 2002 |
| ZAH Recovery Ltd | Wholesale & retail | 2024 |