| THE Vestry Richmond Limited | Real estate | 2026 |
| THE Vintage Barber Ltd | Other services | 2017 |
| THE Wandering Pint Ltd | Wholesale & retail | 2025 |
| THE Wave Video Marketing Ltd | Professional & scientific | 2025 |
| THE Wedding Hire Company Ltd | Professional & scientific | 2018 |
| THE White Hart PUB and B&B Limited | Hospitality | 2020 |
| THE Wine Escape Limited | Hospitality | 2025 |
| THE Woodlands Management Company (Perivale) Limited | Households | 2005 |
| THE Workplace Partner Ltd | Construction | 2020 |
| THE Wych ELM Kingston Limited | Hospitality | 2014 |
| THE Yucaco Ltd | Wholesale & retail | 2026 |
| The-Apt.Co.Uk. Ltd | Wholesale & retail | 2025 |
| Theah Limited | Administrative & support | 2026 |
| Thebok & Co Ltd | Arts & recreation | 2018 |
| Thelomi Enterprises Limited | Professional & scientific | 2014 |
| Themattlabs Ltd | Information & communication | 2025 |
| THEPROPERTYPRO25 Ltd | Real estate | 2026 |
| Therapy Chapters Limited | Professional & scientific | 2022 |
| Therapy Clinics PVT Ltd | Professional & scientific | 2025 |
| Therefore Strategy & Insight Ltd | Professional & scientific | 2022 |
| Thermal Digital Solutions Ltd | Information & communication | 2026 |
| Think Elephant Limited | Administrative & support | 2012 |
| Thinkers MAP Ltd | Information & communication | 2019 |
| Thinkmusic Limited | Other services | 2018 |
| This Uniform Ltd | Professional & scientific | 2021 |
| Thistle Project Management Ltd | Administrative & support | 2024 |
| Thomas DE Cruz Architects/Designers Limited | Professional & scientific | 1995 |
| Thomas Property Portfolio Ltd | Real estate | 2020 |
| Thompson Cavendish Ltd | Administrative & support | 2002 |
| Thor Lion LLP | | 2014 |
| Thorogood & Sons Limited | Real estate | 1960 |
| Three Arches 2022 Ltd | Real estate | 2022 |
| Three Castles Media Limited | Information & communication | 2011 |
| Three Pines Consulting Ltd | Professional & scientific | 2025 |
| Threepiecelife Limited | Administrative & support | 2023 |
| Threshold Land & Estates Limited | Real estate | 1968 |
| Thrive Secondary School CIC | Education | 2026 |
| Thrivenow Global Ltd | Administrative & support | 2022 |
| Through Advisory Limited | Professional & scientific | 2026 |
| THS Electrical (London) Limited | Construction | 2026 |
| TIA Imagineering Limited | Administrative & support | 1999 |
| TIB Investments Limited | Real estate | 2006 |
| Ticktempo Ltd | Information & communication | 2022 |
| Tidelodge Limited | Extraterritorial | 2000 |
| Tides CT Ltd | Real estate | 2026 |
| Tifani Coffee Shop Ltd | Hospitality | 2015 |
| Tiffin School | Education | 2011 |
| Tiffinian Association Limited | Other services | 2008 |
| Tiffinian Limited | Education | 1976 |
| Tiger UK Investment Ltd | Financial services | 2020 |
| Tilgo Limited | Information & communication | 2017 |
| Timbertree Ltd | Hospitality | 2025 |
| Time Consultancy Enterprises Limited | Administrative & support | 2010 |
| Time to BE YOU Ltd | Health & social care | 2023 |
| Timeout Pizza Ltd | Hospitality | 2023 |
| Timesing Limited | Professional & scientific | 2024 |
| Timothy Mcmullan Ltd | Arts & recreation | 2025 |
| Tindera Ltd | Wholesale & retail | 2025 |
| Tiny Thinkers Limited | Education | 2014 |
| Tiny Tots Nutrition Ltd | Other services | 2013 |
| Tiny Treble Events Ltd | Arts & recreation | 2024 |
| Tippetts Motors (Surbiton) Limited | Wholesale & retail | 1959 |
| Tipzapp Ltd | Information & communication | 2017 |
| Tiro Select Limited | Administrative & support | 2015 |
| Titan TCG Solutions Ltd | Wholesale & retail | 2025 |
| TJ Plastering Specialist Ltd | Construction | 2023 |
| Tj's & Son's Limited | Wholesale & retail | 2020 |
| TJK Rail Ltd | Professional & scientific | 2021 |
| TJP Media Limited | Arts & recreation | 2009 |
| Tkrn Limited | Professional & scientific | 2018 |
| TLC 24 Limited | Real estate | 2014 |
| Tlma Property Ltd | Real estate | 2021 |
| TM Advisors Ltd | Professional & scientific | 2024 |
| TMA Corporate Trustee Limited | Financial services | 2020 |
| TMA Data Management Limited | Information & communication | 2002 |
| TMA Group Holdings Limited | Financial services | 2020 |
| TMA SSP Limited | Information & communication | 2020 |
| TMF Architecture & Design Limited | Professional & scientific | 2024 |
| TNF (UK) Ltd | Wholesale & retail | 2012 |
| TO Kefi Limited | Hospitality | 2022 |
| TO Kefi RM Hospitality Ltd | Hospitality | 2025 |
| TO Sell More Ltd | Professional & scientific | 2026 |
| Tokonatsu Ltd | Information & communication | 2013 |
| Tolworth Driving School Ltd | Education | 2026 |
| TOM Watts Limited | Arts & recreation | 2021 |
| Tomalin Developments Limited | Construction | 2025 |
| Tomalin Kirk (Canterbury) Limited | Construction | 2026 |
| TONY2010 Ltd | Construction | 2020 |
| Tool UP Limited | Information & communication | 2020 |
| Toorak Consulting Ltd | Professional & scientific | 2025 |
| Top Impex Ltd | Wholesale & retail | 2023 |
| Top Plumbing Limited | Construction | 2016 |
| Topex Industries Limited | Professional & scientific | 1997 |
| Toros Restaurant Ltd | Hospitality | 2020 |
| Total Analysis Group Ltd | Information & communication | 2019 |
| Total Assist Care Limited | Administrative & support | 2004 |
| Total Assist Education Limited | Administrative & support | 2005 |
| Total Assist Group Limited | Administrative & support | 2005 |
| Total Assist Healthcare Group Limited | Administrative & support | 2005 |
| Total Assist Holdings Limited | Administrative & support | 2004 |