| Turbosat Limited | Administrative & support | 2004 |
| Turi Commerce Ltd | Wholesale & retail | 2026 |
| Turkish Mangal Ltd | Hospitality | 2020 |
| Turkish Wine Restaurant Ltd | Hospitality | 2025 |
| Turn UP Broadcasting CIC | Information & communication | 2018 |
| Turnbull & Cambridge Limited | Real estate | 2026 |
| Turner Customs Solutions Ltd | Transport & logistics | 2021 |
| Turner Smith GB Ltd | Wholesale & retail | 2024 |
| Turners Residential Limited | Real estate | 2011 |
| Turnwell Care Ltd | Professional & scientific | 2026 |
| Turville Street Ltd | Real estate | 2015 |
| Tusca 1 Limited | Other services | 2007 |
| Tushi Ltd | Construction | 2024 |
| Tutein Developments Ltd | Real estate | 2016 |
| Tutelage Care Barking Ltd | Health & social care | 2021 |
| Tutelage Care Group Limited | Health & social care | 2020 |
| Tutelage Care Hatley Ltd | Health & social care | 2022 |
| Tutelage Care Redbridge Ltd | Health & social care | 2021 |
| Tutelage Homes Ltd | Real estate | 2021 |
| Tutor Teach Ltd | Wholesale & retail | 2020 |
| Tutorbuzz Ltd | Extraterritorial | 2018 |
| Tutordemics Ltd | Education | 2023 |
| Tutorix Ltd | Education | 2024 |
| Tutors LAB Ltd | Education | 2025 |
| Tutu Couture Ltd | Wholesale & retail | 2024 |
| TV 24 Bangla Ltd | Information & communication | 2024 |
| TVL Technologies Ltd | Information & communication | 2022 |
| TW Valuations Limited | Professional & scientific | 2024 |
| Twenty Twenty One Trading Ltd | Real estate | 2021 |
| Twenty-Eight Woodford Road Limited | Households | 1975 |
| TWF Planet Ltd | Wholesale & retail | 2025 |
| TWI Contractors Ltd | Construction | 2024 |
| Twiga Enterprises Limited | Hospitality | 1979 |
| Twinbridge of London Limited | Other services | 2009 |
| Twinkles Star Limited | Other services | 2014 |
| Twins Properties Investment Ltd | Real estate | 2019 |
| Twins Properties Limited | Real estate | 2018 |
| Twinstars Investments Ltd | Real estate | 2026 |
| Twirl Solutions Limited | Information & communication | 2010 |
| Two Click Away Limited | Wholesale & retail | 2025 |
| Two Kindsa High Ltd | Other services | 2016 |
| Two Lights Limited | Health & social care | 2025 |
| Two Minds Studio Ltd | Professional & scientific | 2025 |
| Two Way Street Limited | Wholesale & retail | 2018 |
| Twos ME NOW Ltd | Wholesale & retail | 2025 |
| TWP1 Ltd | Hospitality | 2026 |
| Twyce Digital Limited | Wholesale & retail | 2021 |
| Tyers Gate Ltd | Manufacturing | 2017 |
| Tyes.Io Limited | Information & communication | 2022 |
| Tyger Holdings Ltd | Hospitality | 2020 |
| Tykly Co., Ltd | Wholesale & retail | 2025 |
| Tymm Property Ltd | Real estate | 2020 |
| Tyndel Solicitors Ltd | Professional & scientific | 2020 |
| Tyne Thames Properties Ltd | Real estate | 2023 |
| Typhoon Media Limited | Information & communication | 2020 |
| Tyre House Ltd | Wholesale & retail | 2020 |
| Tyre Sales and Services Ltd | Wholesale & retail | 2014 |
| Tyres Limited | Professional & scientific | 2006 |
| Tysea Desserts Ltd | Hospitality | 2025 |
| Tysea Stores Ltd | Wholesale & retail | 2025 |
| Tyson Estates Ltd | Households | 2023 |
| Tyson's Block Ltd | Hospitality | 2025 |
| TZ Assets Ltd | Financial services | 2025 |
| TZ Distribution Ltd | Wholesale & retail | 2019 |
| TZ Razor Ltd | Other services | 2024 |
| U Cargo Services Limited | Wholesale & retail | 2014 |
| U DAD Properties Limited | Real estate | 2018 |
| U Global Academy Limited | Education | 2026 |
| U H Siddique Limited | Construction | 2019 |
| U Habib Limited | Wholesale & retail | 2025 |
| U Khan Boxing Ltd | Arts & recreation | 2020 |
| U Tune Limited | Wholesale & retail | 2016 |
| U&A Accounting Services Ltd | Professional & scientific | 2023 |
| U&B Capital Construction Ltd | Construction | 2026 |
| U&Y Group Ltd | Wholesale & retail | 2026 |
| U-H Tech Ltd | Information & communication | 2026 |
| U.K. Chand Investments Ltd | Real estate | 2016 |
| U.S.A Nails & Beauty Supply Limited | Wholesale & retail | 2006 |
| U.S.M Optical Ltd | Wholesale & retail | 2024 |
| U3CHATTERBOX Limited | Wholesale & retail | 2013 |
| U98 Estates Limited | Real estate | 2024 |
| U98 Limited | Real estate | 2013 |
| UA Computers Ltd | Manufacturing | 2016 |
| UA Development Services Ltd | Information & communication | 2026 |
| UA Digital Consultancy Ltd | Information & communication | 2025 |
| UA Polishing Ltd | Manufacturing | 2023 |
| UAA Developers Ltd | Real estate | 2023 |
| UAI Consultancy Limited | Information & communication | 2016 |
| UAJ Properties Ltd | Construction | 2023 |
| UB Performance Consulting Ltd | Administrative & support | 2026 |
| UB9 the Broadway Ltd | Real estate | 2018 |
| Uban Services Limited | Administrative & support | 2017 |
| Ubbi Holdings Ltd | Real estate | 2024 |
| UBE Ltd | Information & communication | 2023 |
| Ubermensch Ltd | Wholesale & retail | 2025 |
| UBG Properties Limited | Real estate | 2018 |
| UBG Solutions Ltd | Information & communication | 2025 |
| Ubhi Elite Estates Limited | Real estate | 2025 |
| UBI Constructors Limited | Construction | 2025 |
| Ubique 519 Property Services Ltd | Real estate | 2020 |