| TW Lifestyle Services Ltd | Information & communication | 2018 |
| TWD Limited | Wholesale & retail | 2003 |
| Twelve Times (UK) Limited | Wholesale & retail | 2022 |
| Twelve Twelve Real Estate Ltd | Real estate | 2024 |
| Twelvenineteen LLP | | 2025 |
| Twenty One Care Services Limited | Health & social care | 2021 |
| Twenty Twenty (Promotional) Limited | Manufacturing | 1994 |
| TWENTY21 Group Ltd | Extraterritorial | 2021 |
| TWENTY21 Investments Ltd | Real estate | 2021 |
| Twibey Consulting Ltd | Professional & scientific | 2016 |
| Twickenham Car Boot Ltd | Other services | 2019 |
| Twin CAM 88 Ltd | Construction | 2024 |
| Twin Crafts Ltd | Agriculture & fishing | 2026 |
| Twinfit Limited | Education | 2025 |
| Twinkle Stars Day Nursery (Wolverhampton) Limited | Health & social care | 2015 |
| Twinny Things Limited | Wholesale & retail | 2020 |
| Two Bananas Ltd | Wholesale & retail | 2023 |
| Two Brother Best Ltd | Hospitality | 2024 |
| Two Fiska Ltd | Real estate | 2021 |
| Two Golden Lions Ltd | Hospitality | 2022 |
| Two Keys Properties Ltd | Real estate | 2024 |
| TWP (Newco) 132 Limited | Manufacturing | 2013 |
| TXT4VID Limited | Extraterritorial | 2003 |
| Tychercorp Ltd | Professional & scientific | 2026 |
| Typhon Ltd | Manufacturing | 2020 |
| Tyre Play Systems Limited | Extraterritorial | 2002 |
| Tyrell Information Technology Services Limited | Information & communication | 1997 |
| Tyres on the Road Ltd | Wholesale & retail | 2025 |
| Tyson Transport Ltd | Transport & logistics | 2025 |
| Tytek Group UK Ltd | Manufacturing | 2019 |
| U & N Limited | Hospitality | 2025 |
| U & S Estates Limited | Real estate | 2012 |
| U & S Properties Ltd | Real estate | 2015 |
| U Carz Transport Ltd | Transport & logistics | 2020 |
| U K Trading Places Ltd. | Wholesale & retail | 2001 |
| U.Ctrainingacademy Ltd | Education | 2026 |
| Uber Smart Limited | Other services | 2015 |
| UBH Services Ltd | Wholesale & retail | 2022 |
| Ubuntu Financial Planning Ltd | Financial services | 2026 |
| Ubuntu Legacy Group Ltd | Professional & scientific | 2025 |
| UC and Associates Ltd | Extraterritorial | 2021 |
| Uc&By Ltd | Wholesale & retail | 2025 |
| Uc-Estates Ltd | Real estate | 2020 |
| Uc-Mobile Limited | Information & communication | 2021 |
| Ucanchange Ltd | Health & social care | 2019 |
| Ucls Haulage Limited | Transport & logistics | 2021 |
| Ucreseller Limited | Information & communication | 2018 |
| Udam Rentals Limited | Administrative & support | 2023 |
| Uday's Properties Ltd | Real estate | 2021 |
| Uday's Restaurant Ltd | Hospitality | 2020 |
| Udita Ltd | Health & social care | 2015 |
| UEP Limited | Financial services | 2010 |
| Ufuoma Ufuoma Healthcare Ltd | Health & social care | 2026 |
| UGC Drylining&Interiors Ltd | Construction | 2018 |
| Ugono Property Ltd | Real estate | 2026 |
| UH AI Ltd | Information & communication | 2024 |
| Uhire Midlands Limited | Administrative & support | 2024 |
| UI Group (UK) Secretarial Services Limited | Professional & scientific | 2026 |
| UIA Group Ltd | Real estate | 2026 |
| Ujamaa Limited | Financial services | 2012 |
| UK Auto Cars Limited | Wholesale & retail | 2026 |
| UK Automo Testing Limited | Professional & scientific | 2024 |
| UK Biopharma Ltd | Manufacturing | 2012 |
| UK Building Direct Ltd | Construction | 2017 |
| UK Business Capital Partners LLP | | 2019 |
| UK Car Rentals Ltd | Transport & logistics | 2023 |
| UK Carpet Centre Ltd | Wholesale & retail | 2022 |
| UK Carpet Flooring & Fitting Ltd | Construction | 2019 |
| UK Designer Expo Ltd | Wholesale & retail | 2017 |
| UK Digital Healthcare Ltd | Health & social care | 2019 |
| UK Dreamers Limited | Information & communication | 2023 |
| UK Education & Immigration Consultancy Ltd | Professional & scientific | 2020 |
| UK Elite Accommodation Ltd | Real estate | 2020 |
| UK Fire Door Training Limited | Education | 2021 |
| UK Formation Shopzilla Ltd | Wholesale & retail | 2023 |
| UK Gaming Limited | Information & communication | 2024 |
| UK Hardware Ltd | Wholesale & retail | 2026 |
| UK IT Infrastructure Support Ltd | Information & communication | 2017 |
| UK Landlord Tax Limited | Financial services | 2022 |
| UK MAX Interiors Ltd | Construction | 2022 |
| UK Needs Ltd | Wholesale & retail | 2025 |
| UK Online Furniture Ltd | Wholesale & retail | 2024 |
| UK Prime Distribution Ltd | Wholesale & retail | 2026 |
| UK Pro Clean Ltd | Administrative & support | 2026 |
| UK Pro DJ Limited | Arts & recreation | 2016 |
| UK Recovery and Transport Ltd | Manufacturing | 2026 |
| UK Safe Moves Ltd | Administrative & support | 2014 |
| UK Sports Direct Limited | Professional & scientific | 1998 |
| UK Standard Roofing 007 Ltd | Construction | 2026 |
| UK Telehealthcare Limited | Other services | 2013 |
| UK Today Midlands Ltd | Transport & logistics | 2017 |
| UK Van’S Mates Limited | Transport & logistics | 2024 |
| UK WIN Media Ltd | Information & communication | 2014 |
| UK Windows & Glass Ltd | Manufacturing | 2016 |
| UK Wires Ltd | Construction | 2019 |
| Uk's Best Defence Security Limited | Administrative & support | 2010 |
| Ukadhesives Ltd | Wholesale & retail | 2025 |
| Ukcc Auto Techs-Midlands Ltd | Wholesale & retail | 2018 |
| Uketok Ltd | Information & communication | 2021 |
| Ukfg Midlands Ltd | Financial services | 2025 |