| Trowel Trades (Leicester) Limited | Construction | 2009 |
| Trowell Lane Neurology Limited | Professional & scientific | 2018 |
| Troxler Electronic Labs Limited | Professional & scientific | 2023 |
| Truactiv Limited | Extraterritorial | 2014 |
| Trubuild Limited | Construction | 2019 |
| Truckcycle Limited | Administrative & support | 2001 |
| True Alpha Technologies Ltd | Financial services | 2025 |
| True Needs Ltd | Professional & scientific | 2016 |
| True Pitch Media Limited | Wholesale & retail | 2025 |
| Trueform Aesthetics Ltd | Other services | 2025 |
| Truly Smart Ltd | Professional & scientific | 2017 |
| Trung LE Ltd | Other services | 2026 |
| Trustedprojectprofessionals Ltd | Professional & scientific | 2018 |
| Trwc Marketing Ltd | Professional & scientific | 2022 |
| TRY Track Ltd | Arts & recreation | 2024 |
| TS Room Ltd | Wholesale & retail | 2025 |
| TSA Healthcare Ltd | Health & social care | 2018 |
| TSK Consulting Ltd | Professional & scientific | 2015 |
| TSK Propco Limited | Real estate | 2024 |
| TTE Property Investments Limited | Real estate | 2024 |
| TTP Heron House Ltd | Construction | 2021 |
| TTP HH Assets Ltd | Real estate | 2024 |
| TTP HH Holdings Ltd | Financial services | 2024 |
| TTS Roman Limited | Information & communication | 2025 |
| Tuckers Developments 171 Ltd | Real estate | 2026 |
| Tudor Court Financial Planning Ltd | Financial services | 2013 |
| Tulpa Digital Ltd | Professional & scientific | 2019 |
| Tungsten Court Management Limited | Real estate | 2015 |
| Tungsten Park (Lutterworth) Management Company Limited | Households | 2021 |
| Tunstall Consultants Limited | Professional & scientific | 2010 |
| Turbine Component Services Limited | Manufacturing | 2011 |
| Turbogrind Limited | Manufacturing | 1999 |
| Turbosaw Ltd | Manufacturing | 2011 |
| Turkish Hairlines Lougborough Ltd | Other services | 2023 |
| Turkish Mangal Charcoal Ltd | Wholesale & retail | 2020 |
| Turkish Style Barber 11 Ltd | Other services | 2025 |
| Turned on ITS Head CIC | Arts & recreation | 2017 |
| Turner and Smith Limited | Professional & scientific | 2016 |
| Turner Evans Holdings Limited | Financial services | 2023 |
| Turnip Point CIC | Hospitality | 2024 |
| Turnkey Project Management Limited | Professional & scientific | 1987 |
| Turnkey Solution Exec Limited | Administrative & support | 2023 |
| Turnpike Road Farm Limited | Administrative & support | 1960 |
| Turquoise Cafe Limited | Hospitality | 2019 |
| Turvy Motors Limited | Wholesale & retail | 2010 |
| Twenty Eight Bespoke Joinery Limited | Construction | 2022 |
| TWENTY12 Properties Ltd | Real estate | 2022 |
| TWENTY9TWENTY4 Limited | Information & communication | 2020 |
| Twentyfour Asset Solutions Limited | Wholesale & retail | 2024 |
| Twiggers Motorcycles Ltd | Wholesale & retail | 2003 |
| TWIN3 Limited | Information & communication | 2018 |
| Two Rivers Barnstaple Ltd | Real estate | 2025 |
| Two Rivers Industrial Limited | Real estate | 2004 |
| TWO&5 Ltd | Professional & scientific | 2023 |
| Two&Seven Coaching Ltd | Professional & scientific | 2024 |
| Twofest Ltd | Transport & logistics | 2022 |
| Twofivesix Limited | Information & communication | 2012 |
| Tycon (Leicester) Limited | Wholesale & retail | 1971 |
| Tyde Digital Limited | Professional & scientific | 2026 |
| Tyler Avenue 1959 Limited | Extraterritorial | 2014 |
| Tyrex (Holdings) Limited | Financial services | 2021 |
| Tyrex (Shepshed) Limited | Wholesale & retail | 1983 |
| Tyrrell Digital Solutions Ltd | Information & communication | 2025 |
| Tzuka Limited | Manufacturing | 2017 |
| UCR Construction & Development Limited | Construction | 2013 |
| UCR Gardening & Landscapes Ltd | Administrative & support | 2020 |
| UCR Leeds Limited | Construction | 2024 |
| UCR Property Management Company Limited | Real estate | 2023 |
| Ufinity Limited | Administrative & support | 2004 |
| UK Bell Foundries Ltd | Manufacturing | 2007 |
| UK Connections Ltd | Other services | 2025 |
| UK Eduhub Ltd | Education | 2023 |
| UK Fire Services Limited | Public administration | 2017 |
| UK First Contact Ltd | Other services | 2024 |
| UK Global Academy of Implantology Ltd | Education | 2025 |
| UK Libra Ltd | Manufacturing | 2021 |
| UK Medical Education & Research Limited | Public administration | 2025 |
| UK Oxygen Projects Limited | Construction | 2013 |
| UK Planter Solutions Ltd | Professional & scientific | 2020 |
| UK Safety Limited | Administrative & support | 2006 |
| UK Shopping Mall Limited | Wholesale & retail | 1937 |
| UK Specialist Healthcare Limited | Health & social care | 2014 |
| UK Stardust Ltd | Other services | 2016 |
| UK Sweets Limited | Wholesale & retail | 2010 |
| UK Tool Buyer Ltd | Extraterritorial | 2024 |
| UK VCO Ltd | Arts & recreation | 2018 |
| Uk's Chicken Ltd | Hospitality | 2026 |
| Uk-Link Couriers Ltd | Transport & logistics | 2024 |
| Uk-Middle East Bridge Ltd | Manufacturing | 2023 |
| Ukesc Limited | Other services | 2002 |
| Ulex Group Ltd | Professional & scientific | 2022 |
| Ulsmith Ltd | Information & communication | 2025 |
| Ultima Ventures Limited | Real estate | 2001 |
| Ultimate Collection Limited | Wholesale & retail | 1975 |
| Ultra Padel Ltd | Arts & recreation | 2025 |
| Unconventional Wedding Limited | Information & communication | 2018 |
| Uncut Jams Ltd | Arts & recreation | 2024 |
| Undented Limited | Wholesale & retail | 2026 |
| UNI Cycles (Midlands) Limited | Wholesale & retail | 2013 |
| UNI Rooms (L'Boro) Limited | Real estate | 2021 |