| Translog International Limited | Transport & logistics | 2013 |
| Transport Maintenance Limited | Wholesale & retail | 2009 |
| Transym Computer Services Limited | Information & communication | 1983 |
| Transyx Limited | Information & communication | 2025 |
| Travel Beyond Ltd | Administrative & support | 2007 |
| Travel Light Ltd | Real estate | 2025 |
| Travel Services 101 Ltd | Administrative & support | 2024 |
| Travel-Sea International Services & Consultancy Limited | Professional & scientific | 2011 |
| Traveldeo Ltd | Administrative & support | 2013 |
| TRE Arcieri Limited | Hospitality | 2007 |
| Treacle Media Limited | Information & communication | 2003 |
| Treband Limited | Hospitality | 2008 |
| Trek Hire UK Limited | Wholesale & retail | 2008 |
| Tremadog Investment Limited | Professional & scientific | 2011 |
| Tremblays Catering Limited | Hospitality | 2022 |
| Trenchard Arlidge Ltd | Real estate | 2003 |
| Trent Reina Limited | Other services | 2011 |
| Tres Cantos Open LAB Foundation | Administrative & support | 2010 |
| Trevelyan (Guildford) Limited | Hospitality | 1957 |
| Triatha House Management Company Limited | Households | 2006 |
| Tribe & Robinson,Limited | Professional & scientific | 1925 |
| Trick of the EYE Ltd | Arts & recreation | 2017 |
| Trinity Impex Limited | Manufacturing | 2013 |
| Trinity Purchasing UK Limited | Administrative & support | 2011 |
| Triptych Investments Limited | Other services | 1970 |
| Trisentius Limited | Professional & scientific | 2026 |
| Trish Gumkowski Limited | Health & social care | 2007 |
| Trojan Construction London Limited | Construction | 2010 |
| Troogue Ltd | Information & communication | 2025 |
| Tropical Crescent Ltd | Real estate | 2021 |
| Trotton Estate Vineyards (Management) Limited | Administrative & support | 2022 |
| Trotton Estate Vineyards Limited | Wholesale & retail | 2011 |
| Trubsons Limited | Real estate | 1937 |
| Truck Away Limited | Extraterritorial | 2024 |
| True Black Design Co Ltd | Professional & scientific | 2019 |
| True Feel Live Ltd | Arts & recreation | 2024 |
| True Love RDT Film Limited | Administrative & support | 2022 |
| Truesdale Consulting Services Ltd | Professional & scientific | 2013 |
| TS Drawings Ltd | Professional & scientific | 2026 |
| TS Group (PVT) Ltd | Hospitality | 2024 |
| Tsawhi Ltd | Arts & recreation | 2023 |
| TSG Film Group Ltd | Administrative & support | 2026 |
| TTM Consulting Ltd | Professional & scientific | 2025 |
| Tube Audio Limited | Information & communication | 2005 |
| Tudor Court Godalming (Freehold) Limited | Households | 2011 |
| Tudor Rose Developments Limited | Real estate | 1984 |
| Tumentor Ltd | Education | 2024 |
| Tunahan Drafting Ltd | Construction | 2020 |
| Tung Sun Limited | Administrative & support | 2025 |
| Tunsgate Limited | Administrative & support | 2023 |
| Tunsgate Quarry ST Management Company Limited | Real estate | 2015 |
| Tunstall Solutions Ltd | Administrative & support | 2025 |
| Turkuaz Guildford Ltd | Hospitality | 2025 |
| Turning Assessment Solutions Ltd | Information & communication | 2013 |
| Turning Left for Less Limited | Administrative & support | 2024 |
| Turret House Management Ltd | Real estate | 2019 |
| TVR Automotive Limited | Manufacturing | 2013 |
| TVR Electric Vehicles Limited | Manufacturing | 2013 |
| TVR Finance Limited | Financial services | 2017 |
| Tweeto Ltd | Wholesale & retail | 2022 |
| Twenty Accounting Limited | Professional & scientific | 2023 |
| Twenty First Media Limited | Professional & scientific | 2011 |
| Twenty SIX Gardner Road Limited | Real estate | 2019 |
| TWENTYSIX22 Ltd | Professional & scientific | 2013 |
| Twiglets Gardening Services Ltd | Other services | 2017 |
| Twin Tips Ltd | Other services | 2025 |
| Twintime Consultants Limited | Professional & scientific | 2016 |
| Twist Global Limited | Wholesale & retail | 2023 |
| TWM Corporate Services Limited | Extraterritorial | 2004 |
| TWM Solicitors LLP | | 2003 |
| TWM Trust Corporation Limited | Professional & scientific | 2003 |
| Two Brothers One Car Ltd | Information & communication | 2026 |
| Two Exeter Street Limited | Households | 2011 |
| Two Magpies Limited | Administrative & support | 2025 |
| Twrr Estates Limited | Households | 2025 |
| TWS Utilities Ltd | Construction | 2022 |
| Tyalgum Press Ltd | Information & communication | 2014 |
| Tyler Mortgage Management Ltd. | Financial services | 1920 |
| Tymz Food Ltd | Hospitality | 2011 |
| Tymz Group Ltd | Hospitality | 2016 |
| Tyrells Place Management Company Limited | Households | 2005 |
| Tyson Consultants Limited | Professional & scientific | 1997 |
| Tytherleigh Limited | Professional & scientific | 2002 |
| Tyting Farm Freehold Management Company Limited | Households | 2021 |
| Ubique Design Limited | Information & communication | 2012 |
| Uflow Property Services Ltd | Construction | 2019 |
| Uhomeproperties Limited | Real estate | 2017 |
| UK Caravans Exports Ltd | Wholesale & retail | 2010 |
| UK Carbon Verification Ltd | Professional & scientific | 2026 |
| UK Direct Logistics Ltd | Transport & logistics | 2026 |
| UK Elite Property Ltd | Manufacturing | 2024 |
| UK Fight Officials Training Ltd | Education | 2024 |
| UK Football Shirts Ltd | Wholesale & retail | 2022 |
| UK Furniture Outlet Limited | Wholesale & retail | 2025 |
| UK Geospatial Ltd | Information & communication | 2015 |
| UK Hotel Booking Ltd | Administrative & support | 2004 |
| UK Kids Ltd | Education | 2015 |
| UK Men's Sheds Limited | Extraterritorial | 2019 |
| UK Parking Administration Ltd | Administrative & support | 2021 |
| UK Shops Enterprises Limited | Wholesale & retail | 2000 |