| Turner Construction Services Limited | Construction | 2017 |
| Turning Point Supported Living CIC | Other services | 2026 |
| TW Controls Limited | Manufacturing | 2018 |
| TW Quality Services Limited | Professional & scientific | 2025 |
| Tweak Video Limited | Information & communication | 2015 |
| Twelve Productions Limited | Arts & recreation | 2016 |
| Twenty 20 Signs Ltd | Professional & scientific | 2019 |
| Twenty-Ten Engineering Limited | Wholesale & retail | 2012 |
| TWENTY2 Live Ltd | Extraterritorial | 2022 |
| TWENTY9 Touring Limited | Arts & recreation | 2026 |
| Twilight Dawn Gaming Ltd | Wholesale & retail | 2025 |
| TWL Heating Solutions Ltd | Construction | 2025 |
| Two Score Music Ltd | Information & communication | 2023 |
| Twynnings Stables Limited | Agriculture & fishing | 2024 |
| Tybrook Ltd | Real estate | 2017 |
| Tyler Brookes Ltd | Financial services | 2013 |
| Tyre and Autofit Limited | Professional & scientific | 2015 |
| U.A. Deliveries Ltd | Transport & logistics | 2026 |
| Ubichem (UK) Limited | Wholesale & retail | 2012 |
| Ubique Legal Limited | Professional & scientific | 2020 |
| Ucall Broadband Limited | Information & communication | 2025 |
| Ucall Communications Ltd | Administrative & support | 2024 |
| Ucall I.T and Data Limited | Information & communication | 2025 |
| Ucall Mobile Phones Limited | Information & communication | 2025 |
| Ucall Telecom Limited | Information & communication | 2009 |
| UCO Ltd | Wholesale & retail | 2004 |
| UF Ltd | Wholesale & retail | 2025 |
| Ufukama Foodstuff Suppliers Limited | Wholesale & retail | 2026 |
| UK Ceilings and Partitions Ltd | Construction | 2018 |
| UK Fire Training Limited | Education | 2004 |
| UK Fireshield Limited | Professional & scientific | 2026 |
| UK First AID Training Ltd | Administrative & support | 2022 |
| UK Nordstar Ltd | Wholesale & retail | 2026 |
| UK Pepinos Ltd | Hospitality | 2023 |
| UK Training Group Holdings Ltd | Financial services | 2025 |
| UK Ukraine Trade Hub Ltd | Wholesale & retail | 2022 |
| UKM Print & Embroidery Ltd | Wholesale & retail | 2015 |
| UKM Properties Ltd | Real estate | 2025 |
| Ulmus Lamb Limited | Construction | 2022 |
| Ultra Foods Ltd | Hospitality | 2025 |
| Ultra Medix Ltd | Health & social care | 2014 |
| Ultra Plumbing Limited | Construction | 2008 |
| Ulula Ltd | Wholesale & retail | 2020 |
| Umshlanger Limited | Professional & scientific | 2019 |
| Unbound Therapy Ltd | Public administration | 2025 |
| Unica INV. Limited | Financial services | 2021 |
| Unicorn Baby and Kids Limited | Wholesale & retail | 2023 |
| Unique Doors and Windows Ltd | Construction | 2024 |
| Unique IQ Limited | Information & communication | 2006 |
| Universal Cleaners Limited | Administrative & support | 2025 |
| Universal Food Market & Plus Ltd | Wholesale & retail | 2023 |
| Universal Sheet Metal Limited | Manufacturing | 2003 |
| Universal Tyre Company (Deptford) Limited(The) | Wholesale & retail | 1933 |
| Unlocked Associates Ltd | Professional & scientific | 2025 |
| Unlocked Club Ltd | Information & communication | 2021 |
| Unsung Music Limited | Arts & recreation | 2002 |
| Uplands Holdings Limited | Professional & scientific | 1996 |
| Uplands Trading Ltd | Manufacturing | 2015 |
| Upper Skilts Management Company Limited | Real estate | 2015 |
| Upstairs @ 33 Ltd | Hospitality | 2020 |
| Upton Chippy Ltd | Hospitality | 2025 |
| Upton Engineering & Sons Limited | Construction | 2003 |
| Upton Vision Ltd | Professional & scientific | 2020 |
| Upvcwindors Ltd | Manufacturing | 2022 |
| Upward & Rich Ltd | Administrative & support | 2015 |
| Ustad Ijaz Limited | Wholesale & retail | 2025 |
| Usul Property Ltd | Real estate | 2020 |
| Utility Forensics Limited | Professional & scientific | 2025 |
| UV Therapy Ltd | Manufacturing | 2026 |
| V Porter Accountancy Limited | Professional & scientific | 2016 |
| V R Delivery Ltd | Manufacturing | 2025 |
| V&D Roofing Ltd | Construction | 2026 |
| V7 Traders Ltd | Wholesale & retail | 2024 |
| Valan WAX Products Limited | Manufacturing | 1995 |
| Vale Consultants Ltd. | Construction | 2026 |
| Vale Consulting Ltd | Professional & scientific | 2022 |
| Vale Stables Limited | Construction | 2007 |
| Valen Clothing Ltd | Wholesale & retail | 2025 |
| Valeo Engine Cooling UK Limited | Manufacturing | 1976 |
| Valeo Service UK Limited | Wholesale & retail | 1969 |
| Valhalla Community Fitness CIC | Education | 2025 |
| Valhalla Gym Limited | Arts & recreation | 2021 |
| Valkyr Consulting Limited | Professional & scientific | 2023 |
| Vallens Crane and Lifting Limited | Extraterritorial | 2021 |
| Valley Spring Company Limited(The) | Manufacturing | 1957 |
| Valuing Individual People Limited | Health & social care | 2014 |
| Van DO Transport Ltd | Transport & logistics | 2025 |
| Van Happy Ltd | Wholesale & retail | 2023 |
| Van-Roy Spedition Limited | | 1986 |
| Vanessa Tuzzio Just Mortgages Limited | Financial services | 2022 |
| Vanguard Wholesale Ltd | Wholesale & retail | 2021 |
| Vantage R&D Consulting Limited | Professional & scientific | 2019 |
| Vaping Master Ltd | Wholesale & retail | 2025 |
| Vaping Pro Ltd | Wholesale & retail | 2026 |
| Variety Motor Cars Ltd | Wholesale & retail | 2023 |
| VAT Liaison Limited | Extraterritorial | 1996 |
| Vathi Group Ltd | Health & social care | 2023 |
| Vatish Investment Ltd | Administrative & support | 2024 |
| Vaughans Tapas Bar Ltd | Hospitality | 2018 |
| VBE Foods Limited | Manufacturing | 2021 |