| Three Lions Properties Ltd | Real estate | 2021 |
| Throopgreen Consultancy Limited | Construction | 2020 |
| Tide Marketing Limited | Information & communication | 2024 |
| Tidworth Residents Company Limited | Households | 2003 |
| Tiger Communications (Holdings) Europe Limited | Information & communication | 2014 |
| Tiger Communications (Holdings) Limited | Financial services | 2018 |
| Tiger Communications Holdco Limited | Financial services | 2022 |
| Tiger Communications Holdings NO.2 Limited | Information & communication | 2014 |
| Tiger Communications PLC | Information & communication | 1979 |
| Tiger Lens Consulting Limited | Information & communication | 2025 |
| Tigertms Limited | Information & communication | 2019 |
| Tiklu Ltd | Hospitality | 2025 |
| Tiles of Ringwood Ltd | Wholesale & retail | 2024 |
| TIM Dean Consultancy Limited | Professional & scientific | 2004 |
| Time Events (Salisbury) Limited | Hospitality | 2023 |
| TJ Marine Ltd | Manufacturing | 2009 |
| TJ Willis Grab Hire Ltd | Transport & logistics | 2021 |
| TLB Associates Limited | Administrative & support | 2012 |
| TNS Marine & Automotive Ltd | Professional & scientific | 2022 |
| Toftingall Wind Limited | Construction | 2021 |
| Tolley Heritage Limited | Construction | 2019 |
| Tomlinson Property Ltd | Financial services | 2024 |
| Tongue N Groove Limited | Construction | 2003 |
| Tony R Scriven Ltd | Administrative & support | 2022 |
| Top Tenant Ltd | Real estate | 2021 |
| Topmark Distribution Ltd | Wholesale & retail | 2011 |
| Total Construction (Hampshire) Limited | Construction | 2006 |
| Total Solution Building Services Ltd | Extraterritorial | 2014 |
| Total Turbo Ltd | Professional & scientific | 2025 |
| Tote Kits Limited | Extraterritorial | 2016 |
| Touchstone Projects (Wessex) Ltd | Construction | 2023 |
| Tower & Co. Media Ltd | Administrative & support | 2026 |
| Town & Country Property Developments Ltd | Construction | 2019 |
| Town House (Arundel) Ltd | Hospitality | 2019 |
| Trace Editors Limited | Administrative & support | 1997 |
| Trackhubuk Ltd | Information & communication | 2025 |
| Trade Checkers Ltd | Information & communication | 2019 |
| Tradeenfo Ltd | Wholesale & retail | 2013 |
| Traffic Technology Research Limited | Professional & scientific | 1971 |
| Trail Cook Ltd | Professional & scientific | 2005 |
| Train AV Ltd | Education | 2018 |
| Trainingbible United Kingdom Limited | Professional & scientific | 2006 |
| Transfesa UK Limited | Transport & logistics | 1972 |
| Transform Glazing Limited | Construction | 2015 |
| Transmotor UK (2012) Ltd | Manufacturing | 2012 |
| Trinity (Weymouth) 2020 Management Company Limited | Households | 2020 |
| Trinity Broadway Properties Ltd | Real estate | 2019 |
| Trophi Limited | Transport & logistics | 2021 |
| TRT Investments Limited | Real estate | 2016 |
| True Solution Financial Services Ltd | Financial services | 2023 |
| Trusted Technology Partnership (Holdings) Ltd | Information & communication | 2022 |
| Trusted Technology Partnership Group Ltd | Information & communication | 2015 |
| Trusted Technology Partnership Ltd | Information & communication | 1999 |
| Trusted Technology Trustee Limited | Other services | 2023 |
| TRW Ltd | Construction | 2024 |
| TU Casa Homes Ltd | Real estate | 2024 |
| Tudor Rose Farm Limited | Agriculture & fishing | 1951 |
| Tula Consulting Limited | Administrative & support | 2018 |
| Tulkah.Ai Agile Solutions Limited | Information & communication | 2024 |
| Turbo Performance Ltd | Wholesale & retail | 2015 |
| Turk Homes Limited | Construction | 2012 |
| Turnround Garden Designs Ltd | Professional & scientific | 2019 |
| TW Heat Ltd | Construction | 2017 |
| Two Hungry Boys Ltd | Hospitality | 2018 |
| Two I'S Trading Ltd | Financial services | 2021 |
| Two Salterns Way Management Limited | Households | 2022 |
| Twss Property Ltd | Real estate | 2021 |
| Tyre Processing Ltd | Water & waste | 2017 |
| UK Baby Centre Ltd | Wholesale & retail | 2022 |
| UK Fire Consulting Ltd | Other services | 2014 |
| UK Home Group Limited | Construction | 2019 |
| UK Loans Ltd | Extraterritorial | 2013 |
| UK Plumbing Works Ltd | Water & waste | 2013 |
| Ultimate DRY Cleaners Ltd | Other services | 2024 |
| Unique Interiors (North East) Ltd | Construction | 2013 |
| Unique Wheels Admin Ltd | Administrative & support | 2015 |
| Unique Wheels Ltd | Wholesale & retail | 2010 |
| United Group (Dorset) Limited | Extraterritorial | 2015 |
| United Soul Ltd | Wholesale & retail | 2012 |
| United Taxis Limited | Transport & logistics | 1994 |
| Upper Ogmore Energy Limited | Energy | 2021 |
| Uproar Digital Limited | Information & communication | 2015 |
| Urban Homes Inc Ltd | Manufacturing | 2012 |
| Urban Vision Property Services Ltd | Households | 2024 |
| Utopia Beach (RTE) Limited | Households | 2007 |
| V.C. Services | | 2001 |
| V.M (Essex) Ltd | Extraterritorial | 2019 |
| Valerise Management Limited | Administrative & support | 2000 |
| Van Courtlandt Holdings Limited | Professional & scientific | 2016 |
| Vandeleur Close (Freehold) Ltd | Households | 2019 |
| Vanhalla UK Ltd | Wholesale & retail | 2024 |
| Vape Shop Ringwood Ltd | Wholesale & retail | 2019 |
| Vape Shop Upton Limited | Wholesale & retail | 2024 |
| Varga Media Ltd | Professional & scientific | 2025 |
| VBC Management Ltd | Administrative & support | 2010 |
| Vectis Marine Design Limited | Professional & scientific | 2008 |
| Vectis Marine Limited | Extraterritorial | 2009 |
| VEI Property Group Ltd | Real estate | 2024 |
| Velfield Limited | Health & social care | 2024 |
| Vellichor Europe Ltd | Wholesale & retail | 2021 |