| TWA Consultants Ltd | Professional & scientific | 2018 |
| Twin Oak Tree and Garden Specialist Ltd | Agriculture & fishing | 2026 |
| Twins Healthcare Services Ltd | Health & social care | 2025 |
| Twins Medical Services Ltd | Education | 2018 |
| Twins Property Ltd | Real estate | 2024 |
| TY HEM Ltd | Real estate | 2026 |
| TYN Y CAE Limited | Real estate | 2018 |
| T’S Tots Childcare Services Ltd | Health & social care | 2024 |
| UHS International Development Centre Limited | Health & social care | 2023 |
| UI UX Design Limited | Professional & scientific | 2015 |
| UK Centre for Cognitive Behaviour Therapy Ltd | Health & social care | 2007 |
| UK Centre for Health, Safety and Wellbeing Ltd | Extraterritorial | 2008 |
| UK Centre for Rational Emotive Behaviour Therapy Ltd | Health & social care | 2007 |
| UK Digital Commerce Limited | Other services | 2019 |
| UK District Properties Ltd | Households | 2022 |
| UK Driveways and Landscaping Ltd | Construction | 2022 |
| UK Flooring Services Limited | Construction | 2024 |
| UK QP Property Ltd. | Real estate | 2021 |
| UK Repatriation Service Limited | Other services | 2018 |
| Ultra Skin Space Limited | Health & social care | 2024 |
| Umbrella Company Solutions Limited | Administrative & support | 2022 |
| Unblurred Limited | Information & communication | 2024 |
| Undae Studios Ltd | Professional & scientific | 2016 |
| UNI Green Services Limited | Administrative & support | 2023 |
| Unicorn Cleaning Limited | Extraterritorial | 2007 |
| Unique & Independent Consultancy Services Ltd | Information & communication | 2022 |
| Unique Fruit Ltd | Wholesale & retail | 2003 |
| Unique Inspiration Limited | Information & communication | 2001 |
| Unique Inspiration Media Limited | Information & communication | 2012 |
| Unique Rebels Union Ltd | Information & communication | 2011 |
| Unique Skin Limited | Health & social care | 2015 |
| Unit H, SE8 Ltd | Administrative & support | 2020 |
| United Client Services Ltd | Information & communication | 2020 |
| United Electrical Company Limited | Construction | 2026 |
| Unity Contracts Limited | Construction | 2022 |
| Unity Financial LLP | | 2024 |
| Universal K9 Security Services Ltd | Administrative & support | 2021 |
| Universal Spares UK Ltd | Wholesale & retail | 2019 |
| Universal Supplies London Ltd | Wholesale & retail | 2020 |
| Upal Health Ltd | Health & social care | 2022 |
| Uplftd Ltd | Wholesale & retail | 2025 |
| Upton END Farm Properties Limited | Construction | 2002 |
| Urban Futures Limited | Extraterritorial | 1993 |
| Urban Futures LLP | | 2004 |
| Urban Green Artist Ltd | Professional & scientific | 2017 |
| Urban Landscaping & Drives Ltd | Construction | 2025 |
| Urology Health Clinic-Uk Limited | Health & social care | 2016 |
| Uskip Hire Limited | Water & waste | 2007 |
| UT Management Ltd | Information & communication | 2015 |
| Utopy Ltd | Administrative & support | 2015 |
| Utterly Gorgeous Limited | Professional & scientific | 2019 |
| UVA Winebar and Cafe Ltd | Hospitality | 2019 |
| Uvcvtm Limited | Wholesale & retail | 2025 |
| V J D Ltd | Real estate | 2010 |
| Vaccination UK Limited | Wholesale & retail | 1998 |
| Valecourt Limited | Wholesale & retail | 2002 |
| Validions Ltd | Professional & scientific | 2017 |
| Valley Edge Ltd | Real estate | 2025 |
| Valley Road South Management Limited | Households | 2003 |
| Vallo's Limited | Other services | 2017 |
| Van Mawer Limited | Professional & scientific | 2012 |
| Vanquish Auto Solutions Ltd | Wholesale & retail | 2017 |
| Vantage Plumbing and Heating Limited | Wholesale & retail | 2021 |
| Vapella Franchise Limited | Wholesale & retail | 2020 |
| Vapella Limited | Wholesale & retail | 2020 |
| Vapella Retail Ltd | Wholesale & retail | 2014 |
| Vaper Bar (Chelmsford) Ltd | Wholesale & retail | 2017 |
| Vaper Bar Ltd | Wholesale & retail | 2016 |
| Vaper Inc Ltd | Professional & scientific | 2016 |
| Vaughan Road 1969 Limited | Extraterritorial | 2014 |
| VB & Co Hitchin Limited | Extraterritorial | 2012 |
| Vegana Marketplace Limited | Wholesale & retail | 2020 |
| Velocity P.R. Limited | Professional & scientific | 2001 |
| Veloxa Ltd | Administrative & support | 2025 |
| Ventura Group Enterprise Ltd | Financial services | 2025 |
| Venture Financial Consultants Limited | Professional & scientific | 2011 |
| Venturion Capital Ltd | Financial services | 2025 |
| Venzo Ltd | Information & communication | 2024 |
| Verdeluxe Limited | Professional & scientific | 2025 |
| Veridian Projects Limited | Real estate | 2022 |
| Verity Blackwell Ltd | Health & social care | 2017 |
| Vernon Dental Limited | Health & social care | 2014 |
| Vero Interiors Ltd | Construction | 2024 |
| Vertex in Healthcare Limited | Information & communication | 2022 |
| Vertigo ST Ltd | Professional & scientific | 2018 |
| Vestek Limited | Wholesale & retail | 2022 |
| Vestri Limited | Wholesale & retail | 2025 |
| Vezoro Clothing Limited | Wholesale & retail | 2022 |
| VH Global Group Ltd | Real estate | 2015 |
| Viabond Limited | Real estate | 2003 |
| Vibe Provision Limited | Education | 2025 |
| Viberse Ltd | Information & communication | 2019 |
| Vicky in Finance Limited | Professional & scientific | 2023 |
| Victor Berna Limited | Manufacturing | 2018 |
| Victoria Bakery Ltd. | Professional & scientific | 1968 |
| Victoria Drummond Consultancy Limited | Professional & scientific | 2018 |
| Victoria Road (Hitchin) Maintenance Company Limited | Households | 1991 |
| Victoria Way Management Company Limited | Households | 2018 |
| Victory Place 401 Ltd | Real estate | 2025 |
| Vidas Coachworks Ltd | Wholesale & retail | 2015 |