| TSC FX Ltd | Financial services | 2022 |
| Tsentsiper Ltd | Professional & scientific | 2025 |
| TSL Events Ltd | Hospitality | 2025 |
| TSP International Ltd | Wholesale & retail | 2025 |
| Tspc Limited | Real estate | 2021 |
| TST Medical Consulting Ltd | Health & social care | 2025 |
| Tsta Football Academy Limited | Arts & recreation | 2024 |
| TSY Digital Ltd | Information & communication | 2008 |
| TSY Ltd | Real estate | 2022 |
| TT Compliance Ltd | Administrative & support | 2020 |
| TT Myth Ltd | Extraterritorial | 2023 |
| TTC Plumbing & Heating Ltd | Construction | 2024 |
| TTF Education Limited | Education | 2024 |
| TTM Group Limited | Financial services | 2017 |
| Ttops Limited | Administrative & support | 2011 |
| TUA Boxing Erith Ltd | Other services | 2023 |
| Tubish Bakery & Consultancy Limited | Manufacturing | 2019 |
| Tudor Gardens Residents Company Limited | Households | 2001 |
| Tugelatech Services & Consulting Ltd | Information & communication | 2020 |
| Tugmutton Allotments Limited | Arts & recreation | 2019 |
| TUITION4MASTERY Limited | Education | 2020 |
| Tujo Limited | Construction | 2021 |
| Tula Translations Ltd | Professional & scientific | 2014 |
| Tully YT Ltd | Extraterritorial | 2024 |
| Tunaz Realestate Limited | Real estate | 2026 |
| Tunbridge Wells Day Nursery Ltd | Health & social care | 2020 |
| Tunbridge Wells Masonic Hall Limited | Real estate | 1965 |
| Tunc Properties Limited | Real estate | 2024 |
| Tuning Media Limited | Professional & scientific | 2016 |
| Tuproperty Consultancy Ltd | Financial services | 2024 |
| Turbotricity UK Limited | Financial services | 2024 |
| Turinology Ltd | Wholesale & retail | 2026 |
| Turlo Griffin Limited | Arts & recreation | 2017 |
| Turners Hill Management Limited | Households | 2005 |
| Turning Your Dreams Into Reality Ltd | Wholesale & retail | 2026 |
| Turpington RTM Company Limited | Real estate | 2009 |
| Turquoise Dome Ltd | Real estate | 2021 |
| Tusk Construction Limited | Construction | 2013 |
| Tuzun Ltd | Extraterritorial | 2026 |
| TV Choice Limited | Information & communication | 1982 |
| TV Tech Ltd | Information & communication | 2020 |
| TVC Properties Ltd | Real estate | 2015 |
| TVG Services Limited | Construction | 2021 |
| TVL UK Property Ltd | Real estate | 2025 |
| TWC Cornerstone Limited | Real estate | 2020 |
| Twentythree App Ltd | Information & communication | 2025 |
| Twiclub Limited | Manufacturing | 2010 |
| Twincoretech Limited | Wholesale & retail | 2024 |
| Twins Property Management Limited | Real estate | 2016 |
| Twitten Grove Management Company Ltd | Households | 2008 |
| Twiy Vintage Limited | Wholesale & retail | 2022 |
| Two Brothers Construction Ltd | Construction | 2016 |
| Two for the Road Limited | Hospitality | 2017 |
| Two Freelands Ltd. | Households | 2022 |
| Two Mindful Bees Ltd | Hospitality | 2019 |
| Two Minford Gardens Limited | Households | 1985 |
| Two Trees Residential Ltd | Real estate | 2024 |
| Two. Clothing Ltd | Wholesale & retail | 2025 |
| TX London Ltd | Wholesale & retail | 2022 |
| TXE London Ltd | Transport & logistics | 2023 |
| Tybaac Limited | Professional & scientific | 2022 |
| Tyche Apeiron Ltd | Health & social care | 2024 |
| Tycoon Alexander Limited | Real estate | 2020 |
| Tylers Porcelain Sinks Ltd | Construction | 2024 |
| Tyria London Ltd | Extraterritorial | 2026 |
| Tyrrell Limited | Construction | 2000 |
| TZ PDS & Logistics Limited | Transport & logistics | 2019 |
| Tzlm Ltd | Professional & scientific | 2026 |
| U E Building Ltd | Construction | 2026 |
| U Tea Limited | Hospitality | 2021 |
| U.K. Solar Limited | Professional & scientific | 1999 |
| U.K. Victoria International Holdings Ltd | Extraterritorial | 2015 |
| U4RIA AI Ltd | Information & communication | 2025 |
| Uavx Ltd | Professional & scientific | 2020 |
| Ubuthongo Limited | Health & social care | 2017 |
| Ucare 1ST Limited | Education | 2019 |
| Ucheoby Ltd | Construction | 2019 |
| UFH Go Limited | Wholesale & retail | 2025 |
| UG Worldwide UK Limited | Wholesale & retail | 2014 |
| UK Active - 2021 Limited | Professional & scientific | 2021 |
| UK Ductwork Limited | Construction | 2012 |
| UK Geopower Limited | Professional & scientific | 2024 |
| UK Mumpott Natural Products Co., Ltd | Extraterritorial | 2015 |
| UK Personnel Group Limited | Administrative & support | 2017 |
| UK Private Chauffeurs Ltd | Transport & logistics | 2013 |
| UK Removals & Storage Ltd | Transport & logistics | 2021 |
| UK Salon Studio Limited | Other services | 2021 |
| UK Storage Participations Limited | Financial services | 2023 |
| UK Training Workshops Ltd | Education | 2021 |
| UK Travel Designers Limited | Administrative & support | 1998 |
| Ukfws Ltd | Wholesale & retail | 2024 |
| Ulrike Franke Limited | Wholesale & retail | 2022 |
| Ult-Consult Ltd | Administrative & support | 2024 |
| Ultimate Brainwave Ltd | Information & communication | 2015 |
| Ultimate Relocation Limited | Real estate | 2018 |
| Ultra Academy Ltd | Information & communication | 2019 |
| Ultra Education C.I.C. | Education | 2014 |
| Ultra Enterprises Ltd | Education | 2015 |
| Ultra Floors Ltd | Construction | 2025 |
| Ultracare Plus Ltd | Health & social care | 2022 |