| Turturea Ionut Ltd | Construction | 2019 |
| Tushi Construction Services Ltd | Construction | 2024 |
| Tutani Limited | Health & social care | 2014 |
| Tutor Rush Ltd | Education | 2019 |
| Tutusdomus Ltd | Real estate | 2025 |
| Tvmediawall Ltd | Professional & scientific | 2025 |
| Tvmk Ltd | Construction | 2020 |
| TW Decorations Ltd | Construction | 2026 |
| Tweezermed Ltd | Wholesale & retail | 2024 |
| Twenty First 10 Limited | Real estate | 2021 |
| Twenty Twenty Three Ltd | Education | 2015 |
| Twenty-Nine Spaces Ltd | Professional & scientific | 2025 |
| Twentyone Estates Limited | Health & social care | 2021 |
| Twigdenestates Ltd | Households | 2025 |
| Twin a Ventures Limited | Wholesale & retail | 2026 |
| Twinpossible Ltd | Real estate | 2025 |
| Twist Traders Ltd | Wholesale & retail | 2023 |
| Two Eagles House (Management) Limited | Professional & scientific | 2002 |
| Two Rivers Preschool Limited | Education | 2018 |
| Two Shires Wealth Management Ltd | Financial services | 2023 |
| Two Sisters Property Services Limited | Other services | 2024 |
| Twocrumbs Cakery Limited | Hospitality | 2020 |
| Twoll World Limited | Hospitality | 2023 |
| TYA Transport Ltd | Administrative & support | 2024 |
| Tylers Hall Farm Ltd | Arts & recreation | 2004 |
| TYM Management Ltd | Other services | 2013 |
| Tyre King 24/7 Ltd | Wholesale & retail | 2023 |
| Tyre Sure & Brake Company ( London) Ltd | Wholesale & retail | 2020 |
| Tyresure London Bodyworks Ltd | Wholesale & retail | 2023 |
| Tyrone Ricardo Creary Limited | Extraterritorial | 2024 |
| U 4 Utility Ltd | Wholesale & retail | 2016 |
| U Go Physio Ltd | Health & social care | 2014 |
| U Law Services Limited | Professional & scientific | 2024 |
| U R Choice Trading Limited | Wholesale & retail | 2021 |
| U&M Property Development Limited | Real estate | 2021 |
| U'S Hair Salon Limited | Other services | 2007 |
| U-Bahn Limited | Extraterritorial | 2020 |
| U.R.A Home Textiles Ltd | Other services | 2018 |
| UAK Build Ltd | Construction | 2024 |
| UAK Flooring Ltd | Wholesale & retail | 2023 |
| UB Cars Ltd | Wholesale & retail | 2023 |
| Ub's Holdings Limited | Professional & scientific | 2025 |
| Ubhoo Limited | Professional & scientific | 2010 |
| Ubique Plant Limited | Construction | 2019 |
| UCM Investments Ltd | Financial services | 2025 |
| Udat Trade Limited | Wholesale & retail | 2025 |
| Udaya Foods Ltd | Hospitality | 2015 |
| Udftrade Ltd | Wholesale & retail | 2026 |
| Ufanima Medical & Allied Services Limited | Health & social care | 2019 |
| UFO Investments Ltd | Real estate | 2022 |
| UFO Studio Limited | Professional & scientific | 2012 |
| UG Accountants Limited | Professional & scientific | 2009 |
| UID Dry-Lining Ltd | Construction | 2017 |
| UK 1 Construction Limited | Construction | 2020 |
| UK 3B Pro Traders Limited | Wholesale & retail | 2025 |
| UK Bangla Grocery Ltd | Wholesale & retail | 2025 |
| UK Beauty Education & Professionals Network CIC | Education | 2026 |
| UK Carz Club Ltd | Wholesale & retail | 2015 |
| UK Centre Holdings Ltd | Financial services | 2023 |
| UK China Sports Association Ltd | Administrative & support | 2017 |
| UK Country Parks Ltd | Hospitality | 2022 |
| UK Curio Cart Ltd | Wholesale & retail | 2025 |
| UK Drywall Solution Ltd | Construction | 2018 |
| UK Echo Media Ltd | Information & communication | 2024 |
| UK Ecoacoustic Limited | Wholesale & retail | 2020 |
| UK Education Professional IT Solutions Limited | Information & communication | 2018 |
| UK Engineering and Services Limited | Manufacturing | 2018 |
| UK ES Consulting Ltd | Professional & scientific | 2017 |
| UK ES Expert Ltd | Professional & scientific | 2020 |
| UK Gambia Mission Community Interest Company | Public administration | 2022 |
| UK Gearbox Limited | Administrative & support | 2017 |
| UK Gold Corporation Ltd | Construction | 2018 |
| UK Graduate Ltd | Education | 2014 |
| UK Hedging Ltd | Wholesale & retail | 2025 |
| UK House of Professionals Limited | Information & communication | 2020 |
| UK Labour Supply Ltd | Administrative & support | 2020 |
| UK Mainpower Services Ltd | Transport & logistics | 2026 |
| UK Mastic Ltd | Construction | 2025 |
| UK Metaverse School and College Ltd | Education | 2023 |
| UK Mortgage Services Limited | Financial services | 1996 |
| UK Official Tattoo Academy Ltd | Education | 2025 |
| UK Premier Consultants Limited | Professional & scientific | 2013 |
| UK Print Hub Ltd | Manufacturing | 2021 |
| UK Pro LET Ltd | Real estate | 2019 |
| UK Resolve Ltd | Construction | 2023 |
| UK Resolveit Ltd | Professional & scientific | 2019 |
| UK Sail Ltd | Wholesale & retail | 2026 |
| UK Security Partners Ltd | Information & communication | 2023 |
| UK Shopfronts (U.K.) Limited | Construction | 2021 |
| UK Smart Shutters Ltd | Construction | 2020 |
| UK Specialist Rendering Services Ltd | Construction | 2024 |
| UK Sports and Goods Limited | Wholesale & retail | 2025 |
| UK Sterling Traders Ltd | Wholesale & retail | 2025 |
| UK Tattoo Academy Limited | Other services | 2017 |
| UK Tax Pro Ltd | Professional & scientific | 2014 |
| UK Technical Services Limited | Construction | 2025 |
| UK Trade for YOU Ltd | Professional & scientific | 2020 |
| UK Traders PVT Limited | Wholesale & retail | 2019 |
| UK Walls and Floors Ltd | Construction | 2021 |
| UK Wise Group Ltd | Financial services | 2018 |