| Topic-Safety Limited | Professional & scientific | 2023 |
| Toropudriver 01 Limited | Transport & logistics | 2015 |
| Total Airtool Services (UK) Limited | Other services | 2003 |
| Total Tooling Technologies Limited | Administrative & support | 2011 |
| Totalcontent Limited | Professional & scientific | 2008 |
| Touch Fanatics Limited | Information & communication | 2012 |
| Touch Studios Limited | Extraterritorial | 2007 |
| Touchstone HCM Limited | Professional & scientific | 2009 |
| Touchstone House Solutions Limited | Education | 2025 |
| Touchstone Projects Limited | Construction | 2005 |
| Town & Country Landscaping Leamington Ltd | Administrative & support | 2025 |
| Town and Country Concepts Ltd | Manufacturing | 2021 |
| Town and Country Land Rover Ltd | Wholesale & retail | 2019 |
| Town House Management Company Limited | Households | 2003 |
| Tp-E Consulting Limited | Professional & scientific | 2023 |
| TPP NET Ltd | Professional & scientific | 2000 |
| TPP Syndicates Ltd. | Professional & scientific | 2004 |
| TR Electrical Solutions Ltd | Construction | 2026 |
| TR Sun Limited | Hospitality | 2022 |
| Trackside Performance Ltd | Wholesale & retail | 2026 |
| Trade Classics Limited | Wholesale & retail | 2018 |
| Trade Indexes Limited | Administrative & support | 2011 |
| Trade Source Ltd | Wholesale & retail | 2023 |
| Trafalgar Electronic Limited | Wholesale & retail | 2015 |
| Traffic Facilities (UK) Limited | Professional & scientific | 2006 |
| Train-A-Lift Limited | Administrative & support | 1977 |
| Trainify Limited | Information & communication | 2020 |
| Transformation Jfdi Ltd | Extraterritorial | 2020 |
| Transformation Tech Ltd | Information & communication | 2011 |
| Transgreen Limited | Professional & scientific | 2011 |
| Transport Obada Ltd | Transport & logistics | 2023 |
| Transtone UK Limited | Professional & scientific | 2019 |
| Tranter & Thomas Ltd | Administrative & support | 2006 |
| Tree Group Limited | Professional & scientific | 2016 |
| Tree Safe (Warwickshire) Limited | Administrative & support | 2014 |
| Treehouse Media Productions Limited | Information & communication | 2007 |
| Treena Hughes Ltd | Administrative & support | 2020 |
| Treens Close Management Company Limited | Households | 2017 |
| Treens Hill Developments Ltd | Construction | 2021 |
| Trek Consulting Limited | Information & communication | 2024 |
| Trelawny SPT Limited | Manufacturing | 2003 |
| Trengarren Limited | Real estate | 2008 |
| Treowe Contracting Ltd | Construction | 2025 |
| Tribe Business Coaching Limited | Professional & scientific | 2021 |
| Tricade Limited | Construction | 2010 |
| Trichard Property Ltd | Real estate | 2020 |
| Tricia Rosas Music Ltd | Information & communication | 2023 |
| Trident Business Centre Warwick Management Company Limited | Households | 2014 |
| Triki Limited | Administrative & support | 2007 |
| Trinity Bespoke Homes Limited | Construction | 2023 |
| Trinity Tiles and Bathrooms Ltd | Construction | 2026 |
| Triple Crown Print Limited | Manufacturing | 2001 |
| Trishul Associates Limited | Construction | 2014 |
| Trishul Investments Limited | Construction | 2014 |
| TRL CPT Fidco Limited | Extraterritorial | 2014 |
| TRU Trade Group Limited | Other services | 2024 |
| True Node Limited | Information & communication | 2025 |
| Truekind Studios Limited | Professional & scientific | 2026 |
| Truform Contracts Limited | Construction | 2024 |
| Trumbunk Ltd | Arts & recreation | 2022 |
| Trunk Trips Limited | Financial services | 2024 |
| Trust Pet Products Limited | Wholesale & retail | 1974 |
| Trustmede Holdings Limited | Professional & scientific | 1978 |
| Truth Hospitality Ltd | Hospitality | 2025 |
| Truth Index Systems Ltd | Information & communication | 2026 |
| TS Medical Ltd | Health & social care | 2015 |
| TSP Pharma Consulting Limited | Administrative & support | 2009 |
| TTC - Sustainable Transport Limited | Professional & scientific | 2022 |
| TTC Modelling Ltd | Professional & scientific | 2024 |
| TTN Local Limited | Wholesale & retail | 2026 |
| Tube Fittings Limited | Manufacturing | 2015 |
| Tufnell Park Hotels Limited | Hospitality | 2019 |
| TUMMY2MUMMY Leamington Limited | Other services | 2022 |
| Tumultus Limited | Professional & scientific | 2005 |
| Tungsten Brackley Management Company Limited | Real estate | 2022 |
| Turkington Investments Limited | Real estate | 2021 |
| Turkish Barber’S Spa Ltd | Other services | 2020 |
| Turma Ltd | Information & communication | 2026 |
| Turner Macfarlane & Associates Limited | Professional & scientific | 1999 |
| Turnpike Productions Limited | Arts & recreation | 2018 |
| Turpin's Wellbeing Hub Ltd | Health & social care | 2026 |
| Tustains Limited | Wholesale & retail | 1999 |
| Tutor in a Box Limited | Education | 2020 |
| TV Pro Ltd | Other services | 2018 |
| Tvkm Limited | Professional & scientific | 2014 |
| TW Engineering Services (Midlands) Ltd | Professional & scientific | 2014 |
| TW Glazing Limited | Construction | 2025 |
| TW Keil Limited | Professional & scientific | 2017 |
| Tweed Appreciation Limited | Agriculture & fishing | 2023 |
| Twelve 12 Property Ltd | Professional & scientific | 2024 |
| Twenty-Two Squared Limited | Administrative & support | 2017 |
| Twilight Studios Ltd | Information & communication | 2023 |
| Twin Oaks Valley Ltd | Professional & scientific | 2016 |
| Twinkle Twinkle Stars Day Nursery Limited | Education | 2013 |
| Two Angels Investments Limited | Real estate | 2020 |
| Two Brake Limited | Manufacturing | 2015 |
| Two Rivers Associates Limited | Professional & scientific | 2018 |
| Two UP Investments Limited | Information & communication | 2025 |
| Twoboats Limited | Arts & recreation | 2022 |
| Twrkc Limited | Professional & scientific | 2023 |