| UK Laser Creations Ltd | Wholesale & retail | 2022 |
| UK Manufacturing Ltd | Manufacturing | 2025 |
| UK Office of the Victor Pinchuk Foundation | Health & social care | 2006 |
| UK Pacific Hampton Limited | Financial services | 2014 |
| UK Pacific Hampton Station LLP | | 2014 |
| UK Pacific Investments Limited | Real estate | 2000 |
| UK Paragon Housing Ltd | Real estate | 2022 |
| UK Parking Design Ltd | Administrative & support | 2009 |
| UK Plant and Haulage Limited | Wholesale & retail | 2026 |
| UK Plant Sales Ltd | Wholesale & retail | 2026 |
| UK Qualification and Awards Recognition Service Association | Education | 2025 |
| UK Renewable Energy Developments Limited | Energy | 2011 |
| UK Security Design Ltd | Administrative & support | 2009 |
| UK Top Nails Cheltenham Ltd | Other services | 2023 |
| UK Uncountable Limited | Information & communication | 2025 |
| UK68 Agencies Ltd | Wholesale & retail | 2012 |
| UK68 Ltd | Wholesale & retail | 2025 |
| Ukanb Ltd | Professional & scientific | 2017 |
| Ukcc Auto Techs South West Ltd | Wholesale & retail | 2026 |
| Ukdg Ltd | Extraterritorial | 2013 |
| Ukerala Ltd | Wholesale & retail | 2025 |
| Ukgp Brecon Limited | Hospitality | 2022 |
| Ukgp Brecon Services Limited | Administrative & support | 2022 |
| Ukgp Midco Limited | Financial services | 2022 |
| Ukgp Topco Limited | Financial services | 2022 |
| Ukgp Whalesborough Limited | Hospitality | 2022 |
| Ukgp Whalesborough Services Limited | Administrative & support | 2022 |
| Uknighted Ltd | Other services | 2018 |
| Uksf Ltd | Wholesale & retail | 2024 |
| Ukvitalbody Ltd | Wholesale & retail | 2025 |
| Ullenwood Ltd | Professional & scientific | 2023 |
| Ulrich Berens Real Estate (UK) Limited | Real estate | 2026 |
| Ulster Investments (London) Limited | Real estate | 2026 |
| Ulster Investments (Longlevens) Limited | Real estate | 2026 |
| Ulster Investments (ST. Annes) Limited | Real estate | 2026 |
| Ulster Investments (Upton Green) Ltd | Real estate | 2025 |
| Ulster Investments Ltd | Real estate | 2023 |
| Ultima Property Ltd | Real estate | 2024 |
| Ultimate Bike Gear Limited | Wholesale & retail | 2006 |
| Ultimate Hair & Care Ltd | Wholesale & retail | 2011 |
| Ultimate Proof Ltd | Administrative & support | 2011 |
| Ultimore UK Ltd | Wholesale & retail | 2016 |
| Ultra Dynamic Holdings Limited | Manufacturing | 1996 |
| Ultrapure Window Cleaning Ltd | Administrative & support | 2012 |
| Ulvox Ltd | Wholesale & retail | 2025 |
| UMA Skin Clinic Limited | Health & social care | 2023 |
| Umnay Financial Ltd | Wholesale & retail | 2024 |
| Unashe Limited | Health & social care | 2023 |
| Unashe Tech Ltd | Wholesale & retail | 2025 |
| Unbroken Ltd | Information & communication | 2019 |
| Uncia Technologies Limited | Information & communication | 2025 |
| Uncle Bert Ltd | Financial services | 2016 |
| Uncle SAM and Babs Cleaning Service Ltd | Administrative & support | 2026 |
| Underdown Investments Limited | Real estate | 2003 |
| Underwood and Co Properties Ltd | Real estate | 2020 |
| Underwood Enterprises Ltd | Construction | 2022 |
| Undi Services Ltd | Administrative & support | 2023 |
| Undivided Motion Ltd | Real estate | 2025 |
| Unfairlegalfees.Com Ltd | Administrative & support | 2019 |
| Unhidden Design Limited | Administrative & support | 1984 |
| Unicut Limited | Other services | 2026 |
| Unigreg Worldwide Limited | Manufacturing | 2011 |
| Unique Academy Global Limited | Education | 2023 |
| Unique Cleaning Group Limited | Administrative & support | 2017 |
| Unique Cotswolds Stays Limited | Hospitality | 2022 |
| Unique Finds & Acquisitions Limited | Wholesale & retail | 2016 |
| Unique Formulas Limited | Professional & scientific | 2024 |
| Unique Group of Companies Limited | Financial services | 2022 |
| Unique Media Group Limited | Information & communication | 2013 |
| Unique Polymer Systems Limited | Extraterritorial | 1999 |
| Unique Property Maintenance Cotswolds Ltd | Construction | 2023 |
| Unique Sound Systems Limited | Administrative & support | 2000 |
| Unique UK Watches Ltd | Wholesale & retail | 2019 |
| Unit 72 Ltd | Wholesale & retail | 2024 |
| Unite IT Services Ltd | Information & communication | 2024 |
| United Agri Products Limited | Agriculture & fishing | 1993 |
| United Deals Ltd | Wholesale & retail | 2024 |
| United Kingdom GEM Exchange Ltd | Manufacturing | 2026 |
| United Laundries Ltd | Administrative & support | 2026 |
| United Laundries Mids & West Ltd | Administrative & support | 2026 |
| United News + Vape Shop Ltd | Wholesale & retail | 2026 |
| Unity Consultancy Ltd | Arts & recreation | 2023 |
| Unity Members Club Limited | Arts & recreation | 2025 |
| Universal Audio Limited | Wholesale & retail | 2009 |
| Universal Events Services Limited | Administrative & support | 2001 |
| Universal Health Limited | Wholesale & retail | 2019 |
| Universal Protein Supplements Corp UK Limited | Wholesale & retail | 2025 |
| Universal Uniform Ltd | Wholesale & retail | 2004 |
| University of Gloucestershire | Education | 2006 |
| University of Gloucestershire Professional Services Limited | Administrative & support | 2021 |
| Unknown Distance Ltd | Information & communication | 2025 |
| Unleash Your Server Ltd | Professional & scientific | 2014 |
| Unleashed Fields Ltd | Arts & recreation | 2023 |
| Unlimited Capital Ltd | Construction | 2022 |
| Untapped Talent UK Ltd | Administrative & support | 2026 |
| UP My Grade Limited | Education | 2025 |
| Upholstery Techniques (Cheltenham) Limited | Manufacturing | 2013 |
| Upland Residents Association Limited | Hospitality | 1983 |
| Upper Addison Nominees Limited | Professional & scientific | 2023 |
| Upper Knapp Farm (CAM) Limited | Health & social care | 2024 |