| Two Oceans Consulting Ltd | Professional & scientific | 2025 |
| Two Seventy Limited | Wholesale & retail | 2013 |
| Two Wheel Dreams Ltd | Administrative & support | 2025 |
| Twobird Branding Ltd | Professional & scientific | 2019 |
| Twodotdash Consulting Limited | Information & communication | 2013 |
| Twoopc Ltd | Professional & scientific | 2024 |
| Twrv Limited | Professional & scientific | 2015 |
| TWS Productions Ltd | Education | 2025 |
| Twyford Road Management Company Limited | Hospitality | 2008 |
| TY Star Ltd | Construction | 2015 |
| Tyche Management Limited | Administrative & support | 2016 |
| Tycho Enterprises Ltd | Hospitality | 2021 |
| TYE Goodall Services Limited | Construction | 2026 |
| TYM (UK) Limited | Administrative & support | 2015 |
| Typharm Developments Limited | Manufacturing | 2012 |
| Typharm Limited | Manufacturing | 1966 |
| Typhoon Engineering Ltd | Professional & scientific | 2024 |
| Tyre Care Limited | Wholesale & retail | 1994 |
| Tyre Tech 24 Limited | Wholesale & retail | 2008 |
| Tyre Tech Agri Plus Limited | Wholesale & retail | 2024 |
| Tyrecityuk 2019 Ltd | Wholesale & retail | 2019 |
| Tyrehaus Limited | Manufacturing | 2017 |
| Tyrell & Brown (Norfolk) Limited | Construction | 1974 |
| TYRES2U East Anglia Limited | Wholesale & retail | 2007 |
| Tyrone Davies Limited | Other services | 2017 |
| Tyrrell Builders & SON Ltd | Construction | 2022 |
| Tyrrell Properties Norwich Ltd | Real estate | 2023 |
| U B E Taxi Limited | Transport & logistics | 2024 |
| U Boost UK Limited | Professional & scientific | 2023 |
| U K Insurance Business Solutions Limited | Financial services | 2004 |
| U&C Delight Limited | Health & social care | 2024 |
| U&I Events Ltd | Arts & recreation | 2024 |
| U-Ride Norwich Ltd | Transport & logistics | 2023 |
| U.I Group Limited | Transport & logistics | 2016 |
| U.K Overseas Learn & Culture Explore Limited | Education | 2017 |
| U.K. Game Fair Limited | Extraterritorial | 2015 |
| U.W.G. Limited | Professional & scientific | 1989 |
| U2 Homes Ltd | Construction | 2010 |
| UAG Limited | Education | 2001 |
| Uav-Network Ltd | Professional & scientific | 2019 |
| UB Engineering Solutions Ltd | Professional & scientific | 2019 |
| Ubiquitous Connectivity Ltd | Professional & scientific | 2022 |
| Ubisend Limited | Information & communication | 2016 |
| UC Holdings Ltd | Financial services | 2016 |
| UC International Limited | Wholesale & retail | 2006 |
| Ucavo Consulting Ltd | Professional & scientific | 2015 |
| Ucjoypharm Limited | Wholesale & retail | 2023 |
| UCS Fabrication Ltd | Manufacturing | 2012 |
| UDO Global Ltd | Wholesale & retail | 2025 |
| UDO Ventures Ltd | Real estate | 2024 |
| Udrea Logistics Ltd | Transport & logistics | 2020 |
| Udsholt - Clayton Limited | Information & communication | 2010 |
| UE 1 Ltd | Other services | 2022 |
| UE 2 Ltd | Other services | 2022 |
| UE 3 Ltd | Other services | 2023 |
| UE 4 Ltd | Other services | 2023 |
| UEA Company 1 Limited | Administrative & support | 2008 |
| UEA Consulting Limited | Professional & scientific | 2008 |
| UEA Enterprises Limited | Administrative & support | 1991 |
| UEA Into Holdings Limited | Education | 2007 |
| UEA NRP Investments Limited | Real estate | 1993 |
| UEA Pension Trustee Limited | Administrative & support | 2015 |
| UEA Publishing Project Ltd. | Information & communication | 2006 |
| UEA Student Residences Limited | Real estate | 1993 |
| UFO Food Ltd | Hospitality | 2025 |
| UG Transport Ltd | Transport & logistics | 2025 |
| Uganda Energy Corporation Ltd | Financial services | 2025 |
| Ugly Dog Investments Ltd | Real estate | 2023 |
| Ugly Duck Properties Limited | Real estate | 2021 |
| Ugly Duck Systems Ltd | Information & communication | 2022 |
| Ugly Studios Limited | Administrative & support | 2007 |
| Uidev Limited | Administrative & support | 2011 |
| UJ Foods Ltd | Hospitality | 2022 |
| Ujaas Health Ltd | Wholesale & retail | 2011 |
| UK Assistance Accident Repair Centres Limited | Wholesale & retail | 1990 |
| UK Assistance Limited | Extraterritorial | 1993 |
| UK Care and Nursing Ltd | Professional & scientific | 2017 |
| UK Cervical Cancer | Professional & scientific | 2016 |
| UK Credit Limited | Financial services | 2009 |
| UK DAD Trader Limited | Education | 2025 |
| UK East Anglia Properties Ltd | Real estate | 2017 |
| UK Event Production Limited | Professional & scientific | 2020 |
| UK Film Music Limited | Arts & recreation | 2019 |
| UK Fire Limited | Professional & scientific | 2021 |
| UK Fishing School Ltd | Education | 2022 |
| UK Forces Direct Dotcom Limited | Other services | 2017 |
| UK Forks Limited | Wholesale & retail | 2000 |
| UK GAS Holdings Limited | Extraterritorial | 2017 |
| UK Gift & Souvenir Limited | Wholesale & retail | 2017 |
| UK Green Power Generation Limited | Energy | 2011 |
| UK Holidays Limited | Administrative & support | 2014 |
| UK Homes Treasures Ltd | Wholesale & retail | 2026 |
| UK Innovative Property Solutions Ltd | Real estate | 2024 |
| UK IT Recruitment Limited | Administrative & support | 2009 |
| UK Language Services Ltd | Professional & scientific | 2025 |
| UK Mage 3 Ltd | Wholesale & retail | 2019 |
| UK Media Walls Ltd | Construction | 2022 |
| UK Nails Norwich Limited | Other services | 2025 |
| UK Nitrates Limited | Extraterritorial | 2018 |
| UK Online Traders Ltd | Wholesale & retail | 2020 |