| Tonivo Ltd | Information & communication | 2026 |
| Tools & Rules Property Maintenance Ltd | Construction | 2021 |
| Topfinish Plastering Limited | Construction | 2021 |
| Total Event and Medical Services Ltd | Health & social care | 2023 |
| Total Tyre Solutions (UK) LLP | | 2005 |
| Total Venture Holdings Ltd | Administrative & support | 2026 |
| Touzel Ltd | Professional & scientific | 2015 |
| TR2050 Holdings Limited | Administrative & support | 2021 |
| TR2050 Ltd | Other services | 2021 |
| Tracelocator Limited | Other services | 2018 |
| Tractorbarn Ltd | Hospitality | 2022 |
| Transglobe Publishing Limited | Information & communication | 2003 |
| Transit Custom Campers Ltd | Manufacturing | 2021 |
| Travelcards Limited | Administrative & support | 2007 |
| Travelling HAT Media Ltd | Information & communication | 2019 |
| Trba Limited | Professional & scientific | 2013 |
| Treadgold Holdings Limited | Households | 2026 |
| Tred Racing Limited | Professional & scientific | 2025 |
| Tree Solutions Group Limited | Administrative & support | 2025 |
| Treefolk Ltd | Real estate | 2025 |
| Triac Devices Limited | Manufacturing | 2025 |
| Trigya Technologies Limited | Information & communication | 2021 |
| Trinity Point Limited | Professional & scientific | 2018 |
| Trust Partners Limited | Real estate | 2007 |
| TS Electrical (Buckingham) Limited | Construction | 2018 |
| TSD Connect Limited | Information & communication | 2017 |
| TSD Group Limited | Other services | 1999 |
| TSD Managed Services Limited | Information & communication | 2017 |
| Tsiyon Group Limited | Real estate | 2021 |
| TT Wood Heating Services Ltd | Construction | 2025 |
| Tt’S Sweet Tingz Ltd | Hospitality | 2025 |
| Tulsa 21 Limited | Information & communication | 2019 |
| Tutti Frutti Consultancy Ltd | Professional & scientific | 2016 |
| TW24 Consulting Limited | Professional & scientific | 2007 |
| TW24 Holdings Limited | Information & communication | 2013 |
| TWENTY4SEVEN Services Limited | Professional & scientific | 2005 |
| Twigs Nurseries LLP | | 2015 |
| Two Dragons LLP | | 2023 |
| Two Tales Enterprises Ltd | Arts & recreation | 2017 |
| TXM Lean Solutions (UK) Limited | Professional & scientific | 2019 |
| UK Dubai Chocolate Ltd | Manufacturing | 2025 |
| UK Polar Parts Ltd | Energy | 2025 |
| UK to Mars Ltd | Wholesale & retail | 2024 |
| Ultralabs Ltd | Professional & scientific | 2023 |
| Umbilicus Limited | Information & communication | 1989 |
| Under the Shade Limited | Arts & recreation | 2014 |
| Underwood & Weston Limited | Construction | 1998 |
| Uniform City Limited | Wholesale & retail | 2020 |
| Unit TEN Studios Ltd | Other services | 2026 |
| Universal Truck & Trailer Parts Limited | Wholesale & retail | 1998 |
| UNN Limited | Real estate | 2022 |
| Urban Fuel Limited | Information & communication | 2005 |
| V J Property Partnership Limited | Real estate | 2025 |
| V.J. Portfolio Ltd | Real estate | 1984 |
| Vale Chimneys Ltd | Administrative & support | 2015 |
| Vale Property Maintenance Limited | Administrative & support | 2024 |
| Vale Retreats Limited | Arts & recreation | 2021 |
| Valuation Compliance Consultancy Ltd | Professional & scientific | 2026 |
| Van UP Ltd | Wholesale & retail | 2019 |
| Vanguard Consulting Limited | Professional & scientific | 1987 |
| Vargo Limited | Construction | 2012 |
| Varotech Limited | Professional & scientific | 2020 |
| Vastus Fitness Limited | Arts & recreation | 2022 |
| Vault-Mcm Limited | Professional & scientific | 2016 |
| Vbms (Buckingham) Ltd | Professional & scientific | 2013 |
| VCS Group Limited | Construction | 2023 |
| Veevar Ltd | Administrative & support | 2014 |
| Velos Enterprises UK Ltd | Construction | 2021 |
| Vertu 89 UK Ltd | Real estate | 2017 |
| Vertu Homes UK Ltd | Professional & scientific | 2017 |
| Very Clear Ltd | Water & waste | 2025 |
| Vesia Ltd | Financial services | 2024 |
| Vets 2 Your Pets Ltd | Professional & scientific | 2019 |
| Vg-Techno Limited | Information & communication | 2010 |
| VH Martin Consultancy Limited | Professional & scientific | 2026 |
| Victory Close (Brackley) Management Company Limited | Households | 2016 |
| Vigor Education Ltd | Education | 2025 |
| Vimiti Limited | Administrative & support | 2013 |
| Violet Moon Holdings Ltd | Other services | 2019 |
| Virtual CTO Ltd | Information & communication | 2021 |
| Visiblie Limited | Health & social care | 2023 |
| Visionsys Limited | Information & communication | 2004 |
| Visual Control Systems LLP | | 2012 |
| Vittorio Consulting Limited | Administrative & support | 2019 |
| VIV Construct Ltd | Construction | 2023 |
| Viva Gym Ltd | Arts & recreation | 2025 |
| Vivid Motion Limited | Information & communication | 2012 |
| VJN Investments Ltd | Real estate | 2023 |
| VL Test Systems Limited | Wholesale & retail | 1990 |
| Volume Music Solutions Limited | Wholesale & retail | 2020 |
| Vonmount Limited | Wholesale & retail | 2023 |
| VR GEN Ltd | Transport & logistics | 2025 |
| Vrface Productions Ltd | Information & communication | 2020 |
| Vroomvroom Logistics Ltd | Transport & logistics | 2025 |
| VSA Estate Ltd | Real estate | 2020 |
| VTB Projects Ltd | Other services | 2021 |
| W a & C Watson Limited | Administrative & support | 2016 |
| W Ganderton & SON LLP | | 2008 |
| W Hill Business Systems Consultants Limited | Professional & scientific | 2018 |
| W Lambourne & Sons Ltd | Agriculture & fishing | 2008 |