| Twin Crown Ltd | Professional & scientific | 2026 |
| Twin Turbo Ltd | Wholesale & retail | 2026 |
| Twins Brothers Construction Ltd | Construction | 2025 |
| Twinverse Technologies Ltd | Information & communication | 2025 |
| Two a Home Repair Ltd | Construction | 2024 |
| Two Counties Cleaning Services Limited | Administrative & support | 2002 |
| Two Cousinz Ltd | Real estate | 2022 |
| Two Four Holdings Ltd | Real estate | 2025 |
| Two Friends Impex LLC Ltd | Wholesale & retail | 2025 |
| Two Lane Studio Ltd | Wholesale & retail | 2026 |
| Two Mintz Ltd | Professional & scientific | 2023 |
| Two Rhinos Ltd | Wholesale & retail | 2025 |
| Twobsh Limited | Financial services | 2020 |
| Twomkh Limited | Real estate | 2020 |
| TWS School Business Solutions Ltd | Professional & scientific | 2023 |
| TWT Services Ltd | Information & communication | 2021 |
| Twyford Moore Associates Ltd | Professional & scientific | 1995 |
| Txsora Limited | Professional & scientific | 2025 |
| TY Hafod Care Limited | Health & social care | 2020 |
| Tylly Ltd | Information & communication | 2026 |
| Tyndale Technical Authoring Ltd | Professional & scientific | 2015 |
| Tynee Prop 1 Ltd | Real estate | 2017 |
| Tynee PROP2 Limited | Construction | 2018 |
| Tynee Solutions Limited | Information & communication | 2018 |
| Typhon Supplements Ltd | Wholesale & retail | 2026 |
| Typography Ltd | Wholesale & retail | 2025 |
| Tyre Depot Slough Limited | Wholesale & retail | 2016 |
| Tyre House Slough Ltd | Wholesale & retail | 2024 |
| Tyre Station Slough Limited | Wholesale & retail | 2020 |
| Tyrell Properties Ltd | Real estate | 2018 |
| Tyres 4 Trade Ltd | Wholesale & retail | 2010 |
| Tyson Auto Recycling Ltd | Wholesale & retail | 2020 |
| Tysonkhan Ltd | Professional & scientific | 2025 |
| U W Engineering Services Ltd | Manufacturing | 2023 |
| U Wills Ltd | Other services | 2016 |
| U&H Pro Limited | Real estate | 2023 |
| U-Like Homes Ltd | Real estate | 2022 |
| UA Technologies Limited | Information & communication | 2019 |
| UAP Payments Limited | Professional & scientific | 2025 |
| UB10 Ltd | Wholesale & retail | 2024 |
| Ubekpo Resources Limited | Administrative & support | 2025 |
| Uber Monkeys Ltd | Information & communication | 2013 |
| Uberaura Ltd | Wholesale & retail | 2016 |
| UC Solutions Limited | Wholesale & retail | 2003 |
| UCG UK SPV01 Private Ltd | Financial services | 2026 |
| UCG UK SPV02 Private Limited | Financial services | 2026 |
| UCH Business Solutions Limited | Professional & scientific | 2016 |
| UCH Holdings Limited | Financial services | 2020 |
| UCH Logistics (Manchester) Ltd | Transport & logistics | 2013 |
| Uday Construction Ltd | Construction | 2018 |
| Uday Reddy Ltd | Information & communication | 2024 |
| Udham NGO London Ltd | Other services | 2019 |
| Udon Limited | Hospitality | 2018 |
| UEY Ltd | Information & communication | 2025 |
| UGK Property Ltd | Real estate | 2019 |
| UGS Real Estate & Investments Ltd | Real estate | 2024 |
| UH Properties Limited | Real estate | 2022 |
| UHD Investments Ltd | Real estate | 2014 |
| Uhib Accountants Ltd | Professional & scientific | 2023 |
| Uhib Construction Ltd | Construction | 2023 |
| Uhib Enterprises Ltd | Administrative & support | 2023 |
| Uhibgroup Ltd | Wholesale & retail | 2022 |
| Uivus Ltd | Information & communication | 2019 |
| Ujni Pharma Services Limited | Professional & scientific | 2024 |
| UK Academic Advisors Ltd | Education | 2024 |
| UK Angel Records Entertainment Limited | Information & communication | 2017 |
| UK Awans Ltd | Wholesale & retail | 2020 |
| UK Best Store Ltd | Wholesale & retail | 2022 |
| UK Blinds & Curtains Ltd | Construction | 2023 |
| UK Canmobile Ltd | Wholesale & retail | 2014 |
| UK Chauffeur Cars Ltd | Transport & logistics | 2015 |
| UK Chauffeur Drive Ltd | Construction | 2013 |
| UK Chauffeur Hire Limited | Transport & logistics | 2024 |
| UK Choice 1 Scaffolding Ltd | Construction | 2019 |
| UK Cloud Consultants Ltd | Information & communication | 2011 |
| UK Consultancy Ltd | Professional & scientific | 2018 |
| UK Energy Solutions Ltd | Administrative & support | 2023 |
| UK Engineering Solutions Ltd | Professional & scientific | 2018 |
| UK Enterprises Slough Limited | Extraterritorial | 1998 |
| UK Foodbev Distribution Ltd | Wholesale & retail | 2020 |
| UK Foods One Ltd | Hospitality | 2012 |
| UK Furniture & Upholstery Maker Ltd | Manufacturing | 2019 |
| UK Global Estate Ltd | Extraterritorial | 2020 |
| UK Good Homes Ltd | Real estate | 2021 |
| UK Heights Ltd | Wholesale & retail | 2014 |
| UK Infinite Ltd | Transport & logistics | 2022 |
| UK Kitchen and Interiors Limited | Manufacturing | 2014 |
| UK Leak Detection Limited | Construction | 2013 |
| UK Manpower Ltd | Construction | 2021 |
| UK Oils Ltd | Wholesale & retail | 2018 |
| UK Platinum Homes Ltd | Real estate | 2020 |
| UK Polo Brand Ltd | Wholesale & retail | 2019 |
| UK Product Range Limited | Wholesale & retail | 2021 |
| UK Properties Investment (London) Ltd | Real estate | 2025 |
| UK Properties Investor Ltd | Real estate | 2023 |
| UK Property Care Ltd | Administrative & support | 2023 |
| UK Protection Unit Ltd | Administrative & support | 2025 |
| UK Quality Foods Limited | Wholesale & retail | 2020 |
| UK Quepemkars of Nossa Senhora DE Piedade Ltd | Hospitality | 2023 |
| UK Ready MIX Concrete Limited | Construction | 2017 |