| UK Dream Home Builders Ltd | Construction | 2020 |
| UK E Commerce Enterprises Ltd | Information & communication | 2021 |
| UK Events Ltd | Administrative & support | 2025 |
| UK Evergreen Ltd | Construction | 2026 |
| UK Handlings Ltd | Transport & logistics | 2025 |
| UK Interactive Investments Ltd | Real estate | 2016 |
| UK International Limited | Professional & scientific | 2008 |
| UK Khurana Wholesalers Limited | Wholesale & retail | 2022 |
| UK Landmark Construction Ltd | Construction | 2018 |
| UK Landmark Developers Ltd | Construction | 2026 |
| UK Lofts and Extentions Limited | Construction | 2025 |
| UK Nighties Limited | Wholesale & retail | 2024 |
| UK Paint Protection Services Limited | Wholesale & retail | 2013 |
| UK Perfect Shop Ltd | Wholesale & retail | 2024 |
| UK Perfume and Cosmetics Ltd | Wholesale & retail | 2025 |
| UK Plumbing Solutions Ltd | Construction | 2023 |
| UK Property Holdings Group Ltd | Real estate | 2025 |
| UK Property Management Ltd | Real estate | 2017 |
| UK Real Estate Consultants Ltd | Professional & scientific | 2012 |
| UK Residential Management Ltd | Real estate | 2014 |
| UK Skill Line Ltd | Wholesale & retail | 2022 |
| UK Sold Limited | Manufacturing | 2024 |
| UK Star Care Ltd | Education | 2016 |
| UK Telugu Brahmana Association (Uktba) CIC | Health & social care | 2018 |
| UK Top One Ltd | Wholesale & retail | 2014 |
| UK Trade Supply Ltd | Wholesale & retail | 2026 |
| UK Van Hire Limited | Transport & logistics | 2020 |
| UK World Cargo Ltd | Transport & logistics | 2019 |
| Uk-Goods&Watches Limited | Wholesale & retail | 2023 |
| Ukaitrader Ltd | Information & communication | 2026 |
| Ukamzbuy Ltd | Wholesale & retail | 2022 |
| UKB Services Limited | Administrative & support | 2019 |
| Ukbc Construction Ltd | Construction | 2025 |
| Ukdasset Ltd | Real estate | 2026 |
| Uke's Construction Limited | Construction | 2019 |
| Ukfincospv Limited | Financial services | 2025 |
| Ukhan Limited | Professional & scientific | 2018 |
| UKS Construction Services Ltd | Construction | 2022 |
| Uktravelway Limited | Other services | 2020 |
| Ukua Construction Ltd | Construction | 2026 |
| Ultimate Security Services Group Ltd | Administrative & support | 2022 |
| Ultimate Shop Ltd | Wholesale & retail | 2025 |
| Ultimate Sports Direct Limited | Manufacturing | 2019 |
| Ultimate View Limited | Wholesale & retail | 2022 |
| Ultracare Recruitment Ltd | Health & social care | 2026 |
| UM Traders Ltd | Wholesale & retail | 2022 |
| Umbrella Productions Ltd | Information & communication | 2019 |
| UMRAH4U Ltd | Administrative & support | 2024 |
| UN Global Trading Limited | Wholesale & retail | 2010 |
| Unalome Swan Therapy Ltd | Health & social care | 2023 |
| Underacre Properties Limited | Real estate | 2006 |
| UNI Food and Wine Limited | Wholesale & retail | 2016 |
| UNI IT Services CIC | Information & communication | 2025 |
| Unico Ventures Limited | Real estate | 2014 |
| Unikafrique Ltd | Professional & scientific | 2026 |
| Unioncommerce Shopping Ltd | Wholesale & retail | 2025 |
| Uniport Clearance Ltd | Transport & logistics | 2022 |
| Uniq Estates Ltd | Other services | 2011 |
| Unique 75 Ltd | Wholesale & retail | 2022 |
| Unique Builders and Furniture Ltd | Construction | 2024 |
| Unique Builders Developers and General Trading Ltd | Construction | 2022 |
| Unique Builders Ltd | Construction | 2014 |
| Unique Choice Traders Ltd | Wholesale & retail | 2025 |
| Unique Enterprises (U.K.) Limited | Wholesale & retail | 1994 |
| Unique Food & Wine Limited | Wholesale & retail | 2019 |
| Unique Home & Living Ltd | Wholesale & retail | 2023 |
| Unique Investments London Limited | Real estate | 2015 |
| Unique Italian Food Ltd | Wholesale & retail | 2016 |
| Unique Spot Ltd | Wholesale & retail | 2025 |
| Unique TAJ Limited | Wholesale & retail | 2023 |
| United Builders of London Ltd | Construction | 2024 |
| United Getaways Ltd | Hospitality | 2025 |
| United Network Ltd | Professional & scientific | 2021 |
| United Relocations Limited | Real estate | 2021 |
| United SA Ltd | Real estate | 2025 |
| United Tech & Vape Ltd | Other services | 2024 |
| Unitek Associates Limited | Education | 2013 |
| Universal Fortune Limited | Professional & scientific | 2008 |
| Universal Fortune Property Limited | Households | 2024 |
| Universal Memon Organisation Limited | Administrative & support | 2024 |
| Universal Sports Ltd | Education | 2026 |
| Uniway Education Ltd | Education | 2026 |
| Unstoppable Activewear Ltd | Wholesale & retail | 2020 |
| Unzi Transport Services Limited | Transport & logistics | 2015 |
| UP Trading London Ltd | Wholesale & retail | 2026 |
| Upmarket Carpentry Ltd | Construction | 2025 |
| Uppal Assets Ltd | Real estate | 2023 |
| Upper Berkeley Investments Limited | Real estate | 2017 |
| Upti Limited | Transport & logistics | 2025 |
| Upton Road Hounslow Investments Ltd | Real estate | 2026 |
| UR 1ST Store Ltd | Wholesale & retail | 2025 |
| Urban Design Clothing Ltd | Wholesale & retail | 2019 |
| Urban Developers(Uk) Ltd | Construction | 2024 |
| Urban Food Ventures Ltd | Hospitality | 2026 |
| Urban Griddle Ltd | Hospitality | 2025 |
| Urban Kitchen & Bedrooms Ltd | Other services | 2024 |
| Urban Kitchen Group Ltd | Hospitality | 2026 |
| Urban Residential & Lettings Limited | Real estate | 2012 |
| Urban Shelf Limited | Wholesale & retail | 2025 |
| Urbananimal Ltd | Other services | 2016 |