| UK Heathcote SUB 1 Ltd. | Other services | 2018 |
| UK Heathcote SUB 2 Ltd. | Other services | 2018 |
| UK Home Aura Ltd | Wholesale & retail | 2025 |
| UK India Partnership Ltd | Wholesale & retail | 2026 |
| UK Isles Limited | Financial services | 2002 |
| UK LLC Eagle Limited | Financial services | 2025 |
| UK LX Ltd | Wholesale & retail | 2016 |
| UK Post Limited | Transport & logistics | 2023 |
| UK PRS 2 Limited Partnership | | 2021 |
| UK PRS GP 2 Ltd | Real estate | 2021 |
| UK PRS GP Ltd | Real estate | 2021 |
| UK PRS Lettings I LLP | | 2015 |
| UK PRS Limited Partnership | | 2021 |
| UK PRS Member Limited | Financial services | 2015 |
| UK PRS Nominee 2 Ltd | Real estate | 2021 |
| UK PRS Nominee Ltd | Real estate | 2021 |
| UK Security Training Ltd | Administrative & support | 2021 |
| UK Shopline Ltd | Wholesale & retail | 2025 |
| UK Sport Horses Limited | Agriculture & fishing | 2010 |
| UK Tech Distribution Limited | Information & communication | 2023 |
| UK Telco (GB) Limited | Information & communication | 2001 |
| UK Vehicles Hire Limited | Wholesale & retail | 2018 |
| UK Versity Online Limited | Education | 2015 |
| UK Wing Slice Ltd | Hospitality | 2024 |
| Uk-China International Education Development Co., Ltd | Education | 2026 |
| Uk-Medu Limited | Education | 2015 |
| UKCOURIER2GO Limited | Transport & logistics | 2018 |
| Ukkei Store Ltd | Manufacturing | 2025 |
| Ukps (North West) Limited | Administrative & support | 2011 |
| UKR Facades Ltd | Construction | 2018 |
| Ukrainians Aligned Ltd | Professional & scientific | 2026 |
| UKS Security Group Limited | Administrative & support | 2021 |
| Ullington Ltd | Extraterritorial | 2013 |
| Ultimate Logistics Solutions Ltd | Transport & logistics | 2024 |
| Ultimate Northwest Ltd | Real estate | 2025 |
| Ultra Clean Laundrette Ltd | Other services | 2023 |
| Ultra Digital Limited | Administrative & support | 2007 |
| Ultra Fast Cleaning Ltd | Other services | 2021 |
| Ultra Fitness Limited | Other services | 2025 |
| Ultrapos Limited | Information & communication | 1996 |
| Ulxima Ltd | Professional & scientific | 2020 |
| Umar Diagnostics Ltd | Health & social care | 2024 |
| UME 22 Ltd | Information & communication | 2025 |
| UME17 Limited | Information & communication | 2021 |
| UME21 Limited | Information & communication | 2022 |
| UMS Property Management Services (UK) Ltd | Real estate | 2024 |
| Un.Titled Studio Ltd | Professional & scientific | 2018 |
| UNA Road Property Management Company Limited | Households | 2025 |
| UNB Limited | Information & communication | 2012 |
| Under the Grill Ltd | Wholesale & retail | 2026 |
| Undercover Products (International) Limited | | 1970 |
| Undisputed Perfect Massage Ltd | Other services | 2025 |
| Unicore Technologies Ltd | Information & communication | 2026 |
| Unicorn Bookkeeping (UK) Limited | Professional & scientific | 2017 |
| Union Mill Street Wolverhampton SPV Limited | Construction | 2019 |
| Unique Hairworld Salon Ltd | Other services | 2023 |
| Uniquee Ltd | Professional & scientific | 2020 |
| Unisolar Eco Limited | Construction | 2024 |
| Unisphere HQ Limited | Information & communication | 2024 |
| Unistock Limited | Extraterritorial | 2012 |
| United Inventories Ltd | Professional & scientific | 2023 |
| United Reformed Church (North Western Province) Trust Limited(The) | Other services | 1981 |
| United Residential Lettings Ltd | Real estate | 2025 |
| Unitrequest Limited | Construction | 1998 |
| Unity Care Homes Properties Limited | Real estate | 2021 |
| Unity Cash and Carry Limited | Wholesale & retail | 2020 |
| Unity Construction Ltd | Construction | 2010 |
| Unity Group Holdings Limited | Health & social care | 2021 |
| Unity Holdings Ltd | Health & social care | 2015 |
| Unity Homes Investments Limited | Real estate | 2009 |
| Unity Homes Limited | Health & social care | 1990 |
| Universal Enterprise Group Ltd | Financial services | 2024 |
| Universal Freight Solutions Limited | Transport & logistics | 2014 |
| Universe Power Limited | Wholesale & retail | 2019 |
| Universely Limited | Information & communication | 2021 |
| Universes Business Consultancy Limited | Professional & scientific | 2019 |
| University of Salford (Health Services Training) Ltd | Education | 1993 |
| University of Salford Enterprises Limited | Professional & scientific | 1988 |
| University of Salford Students' Union | Education | 2020 |
| Unizen Business Solutions Ltd | Administrative & support | 2023 |
| Unizen Care Ltd | Administrative & support | 2025 |
| Unizen Recruitment Ltd | Other services | 2013 |
| Unlimited Estates Ltd | Real estate | 2020 |
| Unltd. Fitness Ltd | Arts & recreation | 2024 |
| UNQ Solutions Limited | Information & communication | 2020 |
| Unravel Data Ltd | Information & communication | 2025 |
| Unravel Design Studio Ltd | Professional & scientific | 2025 |
| UP Your Street Limited | Wholesale & retail | 2018 |
| Upgrade Project Solutions Ltd | Construction | 2023 |
| Upgrade Recycle Innovations Ltd | Water & waste | 2025 |
| UPL Global Limited | Financial services | 2013 |
| UPP B2B Limited | Professional & scientific | 2016 |
| UPPB2B Group Limited | Financial services | 2020 |
| Upper Park Consulting Limited | Administrative & support | 2025 |
| Upper Park Limited | Construction | 2020 |
| Upper Park Nominees Ltd | Extraterritorial | 2017 |
| Upper Park Nominees NO 2 Ltd | Extraterritorial | 2017 |
| Uppertech UK Limited | Information & communication | 2016 |
| Uptrending Limited | Wholesale & retail | 2011 |
| Upwording Ltd | Education | 2018 |