| Totem Learning Ltd | Information & communication | 2012 |
| Totoia Limited | Agriculture & fishing | 2025 |
| Touchwood Talent Ltd | Administrative & support | 2014 |
| Tournament Court Management Company Limited | Real estate | 2006 |
| Tournament Park Residents Management Company Limited | Households | 2025 |
| Townsend Farm Management Limited | Households | 1992 |
| Toyvoyagers Ltd | Wholesale & retail | 2019 |
| TPL Development Ltd | Real estate | 2019 |
| TR (Realisations) Limited | Manufacturing | 1966 |
| TR Pharm Ltd | Health & social care | 2021 |
| Track Legends Limited | Wholesale & retail | 1996 |
| Tradedoubler Limited | Information & communication | 2000 |
| Traditional European Quality Spirits Ltd | Wholesale & retail | 2021 |
| Traditional Trading Limited | Wholesale & retail | 2026 |
| Trailerpro Limited | Wholesale & retail | 2017 |
| Train Passa Limited | Education | 2023 |
| Trakily Ltd | Information & communication | 2026 |
| Transfer Solutions Ltd | Professional & scientific | 2008 |
| Transform IOT Services Ltd | Information & communication | 2023 |
| Transport Partners Ltd | Transport & logistics | 1998 |
| Transportation Data Surveys Group Limited | Professional & scientific | 2023 |
| Transportation Data Surveys Limited | Professional & scientific | 2007 |
| TRASH4TREASURE UK Limited | Water & waste | 2025 |
| Travers Consulting Limited | Information & communication | 2020 |
| Tree DO Limited | Arts & recreation | 2019 |
| Treehouse Catering Ltd | Hospitality | 2023 |
| Treesap Games Ltd | Information & communication | 2023 |
| Trenchplan Limited | Construction | 1979 |
| Trexx Games UK Ltd | Financial services | 2022 |
| Tricorbraun Europe Limited | Administrative & support | 2025 |
| Tricorbraun Limited | Administrative & support | 2012 |
| Trident Design and Fabrication Limited | Manufacturing | 2005 |
| Trident Roofing and Building Ltd | Construction | 2025 |
| Triovara Consulting Limited | Professional & scientific | 2025 |
| Truck Bidco Limited | Financial services | 2025 |
| Trueform Consultancy Ltd | Professional & scientific | 2025 |
| Truenest Ltd | Construction | 2025 |
| Trusted Professionals Limited | Administrative & support | 2009 |
| Trustpoint IT Solutions Ltd | Information & communication | 2022 |
| Trusts and Wills Limited | Administrative & support | 2019 |
| Tsalach Estates Ltd | Real estate | 2025 |
| Tsbc Consulting Ltd | Professional & scientific | 2019 |
| TSM Property Maintenance Ltd | Real estate | 2023 |
| Tungsten Engineering Ltd | Manufacturing | 2015 |
| Turbo Nuke Limited | Information & communication | 2010 |
| Turkish Barbers (Warwick) Ltd | Other services | 2023 |
| Turnaround and Transformation Ltd | Professional & scientific | 2019 |
| Turning Technologies UK Limited | Wholesale & retail | 1998 |
| Turnkey I.T. Solutions Ltd | Information & communication | 2013 |
| Turnkey Venture Partners Ltd | Professional & scientific | 2022 |
| Turret Training Ltd | Wholesale & retail | 2019 |
| Tutorberry Ltd | Education | 2022 |
| Twin Peak Consultancy Ltd | Administrative & support | 2023 |
| Twin Peak Technologies Ltd | Information & communication | 2025 |
| Two Cousins Limited | Professional & scientific | 2016 |
| Two Ears One Mouth Ltd | Professional & scientific | 2009 |
| Two IP Consultants Limited | Information & communication | 2022 |
| Two IP Limited | Professional & scientific | 2013 |
| Twobeans Limited | Administrative & support | 2018 |
| Type Creative Holdings Limited | Financial services | 2023 |
| Type-Creative Limited | Manufacturing | 1984 |
| Tyreman Holdings Limited | Wholesale & retail | 2023 |
| Tyreman Limited | Wholesale & retail | 1992 |
| Tyres of Warwick Limited | Manufacturing | 2024 |
| Tysoe C12 Limited | Manufacturing | 2016 |
| Tysoe Village Stores Limited | Wholesale & retail | 2010 |
| U K Estates Inc. Ltd | Construction | 2021 |
| U-Pro Innovations Ltd | Construction | 2025 |
| Ubiqutek Ltd. | Professional & scientific | 2012 |
| UBT (EU) Ltd | Wholesale & retail | 2003 |
| UBT Services UK Ltd | Administrative & support | 2024 |
| UGR Consulting Limited | Professional & scientific | 2017 |
| UK Campusai Local Limited | Information & communication | 2025 |
| UK Franking Limited | Manufacturing | 2010 |
| UK Franking Machines Limited | Administrative & support | 2021 |
| UK Naty Ltd | Wholesale & retail | 2021 |
| UK Oral Care Alliance (Uk-Oca) Limited | Manufacturing | 2026 |
| UK RIM Ltd | Professional & scientific | 2019 |
| Ukshealth Ltd | Health & social care | 2019 |
| UKTREND100 Limited | Wholesale & retail | 2026 |
| Ultrasight Ltd | Professional & scientific | 2025 |
| UMA Health Limited | Financial services | 2022 |
| UMA Property Limited | Real estate | 2025 |
| Umage Design Limited | Wholesale & retail | 2016 |
| Umbrella Broadband 2023 Limited | Financial services | 2023 |
| Umbrella Broadband Ltd | Information & communication | 2018 |
| Underground Knowledge Limited | Professional & scientific | 2024 |
| Uni-Fly Heliworx Limited | Transport & logistics | 2021 |
| Unifly UK Limited | Transport & logistics | 2014 |
| Unigram Limited | Information & communication | 2010 |
| Unigram Media Limited | Information & communication | 2010 |
| Unigram Theatre Limited | Information & communication | 2010 |
| Unique Therapies Limited | Other services | 2011 |
| Unison Electrical Ltd | Construction | 2020 |
| Unit One Barber Shop Ltd | Other services | 2019 |
| United Fresh Consortium Limited | Hospitality | 2007 |
| Unitt Property Investments Ltd | Real estate | 2026 |
| Universal Training Bureau Limited | Administrative & support | 2025 |
| Uniwater Holdco UK Ltd | Financial services | 2026 |
| UNO Capital, LP | | 2017 |