| Uniqueu Store Limited | Wholesale & retail | 2023 |
| Uniquip Europe Ltd | Extraterritorial | 2004 |
| Unisal Limited | Health & social care | 2014 |
| Unisex Cruz Stylists Limited | Other services | 2023 |
| Unit Clean Limited | Administrative & support | 2012 |
| Unit Four Repairs Limited | Wholesale & retail | 2019 |
| Unit Media Limited | Administrative & support | 2010 |
| Unit Three Mots Limited | Wholesale & retail | 2018 |
| United and Independent Holdings Group Ltd | Financial services | 2025 |
| United Apex Traders Ltd | Wholesale & retail | 2026 |
| United Authors and Illustrators Limited | Information & communication | 2004 |
| United Bright Energy Limited | Professional & scientific | 2025 |
| United Cakes Ltd | Other services | 2020 |
| United Express Transport Ltd | Transport & logistics | 2025 |
| United Fitness Ltd | Arts & recreation | 2024 |
| United Goan Leicester Community Limited | Hospitality | 2024 |
| United Growth Ltd | Construction | 2025 |
| United Healthcare Group Ltd | Wholesale & retail | 2019 |
| United Help Limited | Health & social care | 2018 |
| United Homes Leicester Ltd | Real estate | 2025 |
| United Mechanical & Electrical Solutions Ltd | Construction | 2005 |
| United Methodist Church (UK) | Other services | 2016 |
| United New Home Ltd | Construction | 2024 |
| United Pallet Network (UK) Limited | Transport & logistics | 2000 |
| United Play Limited | Health & social care | 2018 |
| United Punjab Limited | Arts & recreation | 2022 |
| United Sister’S Community UK Project CIC | Health & social care | 2024 |
| United Sound Entertainment Ltd | Arts & recreation | 2020 |
| United Technology Ltd | Wholesale & retail | 2024 |
| United Tooling Solutions II Limited | Wholesale & retail | 2021 |
| United Tooling Solutions Limited | Wholesale & retail | 2015 |
| United Trading Ltd | Wholesale & retail | 2023 |
| United Workflows Limited | Information & communication | 2025 |
| UNITED92 Ltd | Real estate | 2024 |
| UNITED99 Investments Limited | Real estate | 2025 |
| Unitedcare Angels Services Ltd | Administrative & support | 2025 |
| Unity 8 Investments Ltd | Real estate | 2024 |
| Unity Function Suite Limited | Wholesale & retail | 2010 |
| Unity Housing Support | Hospitality | 2019 |
| Unity Media Midlands Limited | Professional & scientific | 2015 |
| Unity Swimming CIC | Education | 2023 |
| UNITY22 Care Group Limited | Health & social care | 2025 |
| Unitybay Ltd | Hospitality | 2025 |
| Unitycareuk Ltd | Health & social care | 2024 |
| Unitynest Properties Limited | Construction | 2025 |
| Unityre Fleet Services Limited | Wholesale & retail | 2014 |
| Unitysmile Limited | Health & social care | 2023 |
| Universal (Leicester) Ltd | Manufacturing | 2021 |
| Universal Care Providers Ltd | Professional & scientific | 2024 |
| Universal Conveyors Limited | Extraterritorial | 2008 |
| Universal Group L.P. | | 2017 |
| Universal Halls (UK) Limited | Financial services | 2024 |
| Universal Holdings (Midlands) Limited | Manufacturing | 2023 |
| Universal Inventions Limited | Administrative & support | 2025 |
| Universal Plastering Midlands Limited | Construction | 2023 |
| Universal Saviour Limited | Wholesale & retail | 2018 |
| Universal Staffing Group Limited | Administrative & support | 2025 |
| Universal Textiles UK Ltd | Wholesale & retail | 2009 |
| Universal Trade Store Ltd | Wholesale & retail | 2025 |
| University of Leicester Students Union | Administrative & support | 2010 |
| UNL Solutions Ltd | Information & communication | 2012 |
| Unlimited NOT Limited | Administrative & support | 2025 |
| Unloved Daughters Ltd | Professional & scientific | 2022 |
| Unnati Transport Ltd | Transport & logistics | 2022 |
| Unnecessities Limited | Wholesale & retail | 2025 |
| Unoks UK Ltd | Manufacturing | 2022 |
| Unomat International (UK) Limited | Extraterritorial | 2013 |
| Unparalleled Projects Limited | Professional & scientific | 2024 |
| UNR Automotive Ltd | Wholesale & retail | 2004 |
| Unrepresented Claimants Assist Limited | Financial services | 2024 |
| Unsa Limited | Manufacturing | 2023 |
| Unsworth Sugden Group Limited | Professional & scientific | 2024 |
| Until the END Limited | Arts & recreation | 2019 |
| Unveil PR Ltd | Professional & scientific | 2025 |
| Unwind Limited | Hospitality | 2024 |
| UO Management Services Ltd | Wholesale & retail | 2024 |
| UOL FC Limited | Real estate | 2018 |
| UOL Food and Drink Limited | Wholesale & retail | 2016 |
| UOL Investments Limited | Real estate | 2018 |
| UP Money Limited | Wholesale & retail | 2023 |
| UP UP & Grow Ltd | Wholesale & retail | 2023 |
| Uparcelx Ltd | Transport & logistics | 2022 |
| Upboost Limited | Wholesale & retail | 2022 |
| Upcafe Ltd | Wholesale & retail | 2023 |
| Upchurch Logistics Ltd | Transport & logistics | 2014 |
| Update Solutions & Co. Limited | Professional & scientific | 2024 |
| Updevops Limited | Information & communication | 2019 |
| UPE Holdings Ltd | Financial services | 2007 |
| UPE Hospitality Limited | Hospitality | 2021 |
| UPE Recycled Textiles Limited | Manufacturing | 2019 |
| Upgate Ltd | Wholesale & retail | 2022 |
| Upkeep Properties Ltd | Administrative & support | 2023 |
| Uplink Ashford Limited | Real estate | 2010 |
| UPN (Safeguard) Limited | Financial services | 2002 |
| Upper Abbots Royd Prestige Park Ltd | Real estate | 2025 |
| Uppercase Limited | Wholesale & retail | 2005 |
| Upperton Mini Market Limited | Wholesale & retail | 2024 |
| Upperton MOT & Repairs Ltd | Wholesale & retail | 2019 |
| Uppi Services Ltd | Information & communication | 2025 |
| Uppingham & Upperton Dental Practice Ltd | Health & social care | 2008 |