| Trirecycle Ltd | Professional & scientific | 2022 |
| Trisec Ltd | Construction | 1987 |
| Trivec Ltd | Financial services | 2025 |
| TRM Land 1 Ltd | Real estate | 2017 |
| Troyal Farms Limited | Agriculture & fishing | 2012 |
| Trspa Ltd | Arts & recreation | 2013 |
| Trusted Energy Solutions Limited | Construction | 2010 |
| TSH Transport Limited | Administrative & support | 2017 |
| Tssr Installation Ltd | Construction | 2025 |
| TSV Services Limited | Construction | 2008 |
| Ttavor Investments Ltd | Real estate | 2021 |
| TTC Trucks Ltd | Wholesale & retail | 2020 |
| TTF Investments Limited | Real estate | 2014 |
| TTL Holdings (UK) Ltd | Construction | 2009 |
| TTM Property Ltd | Real estate | 2023 |
| TTR Newark Limited | Manufacturing | 2019 |
| TU Mente Limited | Health & social care | 2013 |
| Tuck's Brewery Ltd | Manufacturing | 2022 |
| Turilicious Limited | Manufacturing | 2025 |
| Turkington Engineering & Welding Services Limited | Manufacturing | 2014 |
| Turkington Engineering Holdings Limited | Real estate | 2024 |
| Turkington M&K Limited | Financial services | 2025 |
| Turnbull & SON Ltd | Administrative & support | 2019 |
| Turneround Fabrication Engineering Ltd | Manufacturing | 2012 |
| Tuxford Fishbar Limited | Hospitality | 2018 |
| Tuxford Furniture Hardware Limited | Manufacturing | 2009 |
| Tuxford Lawnmower Centre Limited | Manufacturing | 2006 |
| Tuxford Property Management Ltd | Construction | 2024 |
| Twang.Net Limited | Extraterritorial | 1999 |
| TWENTYONE2 Limited | Information & communication | 2016 |
| Twiseq Ltd | Extraterritorial | 2025 |
| Two Hills Holding Group Limited | Financial services | 2025 |
| Two Zero Vehicle Management Ltd | Transport & logistics | 2025 |
| Tyre Emergency Ltd | Wholesale & retail | 2023 |
| Tyres 2 YOU Limited | Wholesale & retail | 2016 |
| Tyrrell Katz Limited | Wholesale & retail | 2003 |
| Ubique Property Partners Ltd | Real estate | 2026 |
| UCU Delivery Ltd | Transport & logistics | 2024 |
| UK Bar Service Ltd. | Administrative & support | 2005 |
| UK Choir Tours Ltd | Administrative & support | 2023 |
| UK Community Foundations | Other services | 1991 |
| UK Mini Legend Ltd | Wholesale & retail | 2023 |
| UK Monster Truck Rides Limited | Arts & recreation | 2024 |
| UK Nationwide Property Solutions Ltd | Construction | 2007 |
| UK Property Rescue Ltd | Construction | 2019 |
| UK Wind Power Ltd | Construction | 2016 |
| Ukog (GB) Limited | Mining & quarrying | 2000 |
| Ukpr Group Ltd | Construction | 2020 |
| Ultimate Glazing Solutions Ltd | Construction | 2017 |
| Ultimate Holidays Ltd | Administrative & support | 2018 |
| Ultimate Print and Design Limited | Manufacturing | 2018 |
| Ultix Ltd | Wholesale & retail | 2024 |
| Ultra DRY Ltd | Administrative & support | 2021 |
| UMC EBT Limited | Professional & scientific | 2017 |
| UMC Holdings Limited | Professional & scientific | 2017 |
| Undisputed Boxing Limited | Arts & recreation | 2025 |
| Unenrolled Deed Poll Centre Limited | Information & communication | 2025 |
| Unexposed Ltd | Wholesale & retail | 2020 |
| Unique Nails Newark Ltd | Other services | 2025 |
| Unite Consultancy Limited | Health & social care | 2016 |
| United Kingdom Renderers' Association Limited | Agriculture & fishing | 2025 |
| Untamed Photo Safaris Ltd | Administrative & support | 2014 |
| Upton Place Management Company Limited | Households | 2013 |
| Uptons Group Ltd | Arts & recreation | 2026 |
| V & V Productions Ltd | Information & communication | 2012 |
| V M K Stores Ltd | Wholesale & retail | 2019 |
| V-Teck UK Limited | Information & communication | 2015 |
| V.S.M.K Ltd | Wholesale & retail | 2015 |
| VA Architectural Systems Ltd | Manufacturing | 2023 |
| Vacantstays Ltd | Hospitality | 2024 |
| Vacompany Ltd | Administrative & support | 2025 |
| VAG DPS Ltd | Wholesale & retail | 2017 |
| Vagabond Entertainment Limited | Financial services | 2026 |
| Vaidotas Transport Ltd | Transport & logistics | 2018 |
| VAL Property Limited | Real estate | 2022 |
| Value Addition Consulting Limited | Information & communication | 2025 |
| Valuentis Ltd | Professional & scientific | 2003 |
| Vanguard Aluminium Limited | Manufacturing | 2024 |
| Vanishing Ltd | Arts & recreation | 2025 |
| Vanta Group Ltd | Administrative & support | 2025 |
| Vantek Plus Limited | Wholesale & retail | 2016 |
| Vape Domain Ltd | Manufacturing | 2015 |
| Vape Group Limited | Wholesale & retail | 2015 |
| Vape Store Newark Ltd | Wholesale & retail | 2026 |
| Varley Software Limited | Information & communication | 2021 |
| Vector Air Ltd | Wholesale & retail | 2020 |
| Vehicle Trade Logistics Ltd | Wholesale & retail | 2020 |
| Vellazella Lifestyle Ltd | Wholesale & retail | 2025 |
| Velocumen Limited | Professional & scientific | 2018 |
| Vemvetmest Ltd | Other services | 2025 |
| Venture Rating AI Ltd | Information & communication | 2025 |
| Venturecy Limited | Financial services | 2022 |
| Vera Care Angels Limited | Health & social care | 2025 |
| Vere Bros (Property Management) Limited | Real estate | 2012 |
| Veris Health Limited | Hospitality | 2026 |
| Verismart East Midlands Limited | Other services | 2024 |
| Veritas Defence Limited | Administrative & support | 2015 |
| Vertigenuk Ltd | Wholesale & retail | 2026 |
| Very New Media Limited | Professional & scientific | 2014 |
| Vetsupply Ltd | Wholesale & retail | 2024 |