| Turkish Kebab EN Ltd | Hospitality | 2025 |
| Turn Key Stays Suffolk Ltd | Real estate | 2023 |
| Turner & Co Bespoke Joinery Ltd | Construction | 2022 |
| Turner & Co Fine Furniture Ltd | Construction | 2024 |
| Turners Mildenhall Limited | Real estate | 2004 |
| Turning Faceless Ltd | Information & communication | 2024 |
| Turnkey Cleaning Services Limited | Administrative & support | 2025 |
| Turt Limited | Transport & logistics | 2026 |
| TW512 Limited | Hospitality | 2026 |
| Twenty One Transport Ltd | Administrative & support | 2016 |
| TWENTY4 Capital Limited | Professional & scientific | 2020 |
| Twiggy Technology Ltd | Professional & scientific | 2026 |
| Twigs CIC | Other services | 2026 |
| Twilight Health Care Agency Ltd | Administrative & support | 2022 |
| Twin & Co UK Ltd | Wholesale & retail | 2023 |
| Twinscape Group Limited | Construction | 2015 |
| Twinstead Properties Ltd | Extraterritorial | 2020 |
| Twist Media Ltd | Information & communication | 2020 |
| Twisted Zest Ltd | Arts & recreation | 2015 |
| Two Beans Down Coffee Co. Ltd | Hospitality | 2025 |
| Two Flamingos Digital Ltd | Information & communication | 2026 |
| Two Penny Ltd | Manufacturing | 2021 |
| Two Saucy Boys Limited | Wholesale & retail | 2026 |
| Two Worlds Collide Sports Management Limited | Arts & recreation | 2024 |
| Two-Toed Skateboards CIC | Wholesale & retail | 2025 |
| Twopointzero IT Limited | Administrative & support | 2015 |
| TWR Automotive Ltd. | Wholesale & retail | 2021 |
| Tyde Creative Marketing Ltd | Professional & scientific | 2023 |
| TYE Developments Limited | Real estate | 2007 |
| TYE Road Grill Ltd | Hospitality | 2019 |
| Tyke Property Solutions Limited | Real estate | 2018 |
| Tyler Mullett TM Ltd | Construction | 2025 |
| Tyler-Worth Limited | Other services | 2009 |
| Tynmil Properties Ltd | Real estate | 2025 |
| Type Creative Studio Ltd | Professional & scientific | 2019 |
| TYR Estates Limited | Real estate | 2003 |
| Tyrex Mobile Tyre Fitting Ltd | Manufacturing | 2025 |
| Tyson Cooper Ltd | Financial services | 2008 |
| Tyson Sadlo Ltd | Professional & scientific | 2008 |
| Tyton Consulting Services Ltd | Professional & scientific | 2018 |
| TZ Auto Ltd | Wholesale & retail | 2022 |
| TZ Services Limited | Transport & logistics | 2026 |
| Türktok Adpromote Ltd | Information & communication | 2026 |
| U in Mind Care Limited | Health & social care | 2018 |
| U in Mind Staffing Limited | Administrative & support | 2022 |
| U&S Logistics Group Ltd | Transport & logistics | 2022 |
| U'Dox Group Limited | Health & social care | 2018 |
| U-Spec Facilities Services Ltd | Construction | 2005 |
| UAV Developments Ltd | Education | 2016 |
| UAV8 Ltd | Education | 2015 |
| Ubiquitous Consulting Ltd | Professional & scientific | 2024 |
| Ubitronics Limited | Information & communication | 2013 |
| UCG UK Marketplace Ltd | Information & communication | 2017 |
| UCM (Global) Limited | Financial services | 2010 |
| UDO Link Limited | Wholesale & retail | 2016 |
| UFO Technologies Limited | Information & communication | 2026 |
| Ugenskas Limited | Transport & logistics | 2020 |
| Ugly Panda LLP | | 2015 |
| Ugly Rabbit Ltd | Wholesale & retail | 2020 |
| UHS Aero Ltd | Wholesale & retail | 2023 |
| Uiitavera Healthcare Limited | Health & social care | 2026 |
| UK AI Academy Ltd | Education | 2025 |
| UK AI Media Ltd | Information & communication | 2025 |
| UK Blending Holdings Ltd | Financial services | 2026 |
| UK Block Salt Company Ltd | Wholesale & retail | 2016 |
| UK Carpet Care Limited | Administrative & support | 2011 |
| UK Centre of Excellence for Psychotherapy Ltd | Administrative & support | 2024 |
| UK Ducks in a ROW Ltd | Professional & scientific | 2022 |
| UK Elia Limited | Professional & scientific | 2017 |
| UK Fencing Contractors Ltd | Construction | 2019 |
| UK Fried Chicken Ipswich Ltd | Hospitality | 2026 |
| UK Friends Trading Ltd | Hospitality | 2019 |
| UK Goods and Services Limited | Wholesale & retail | 2017 |
| UK GY Express Ltd | Hospitality | 2018 |
| UK Hose Limited | Other services | 2016 |
| UK Hose North East Limited | Administrative & support | 2022 |
| UK Kebab Limited | Wholesale & retail | 2024 |
| UK Mechanical Handling Ltd | Wholesale & retail | 2025 |
| UK Mortgage Prisoners Ltd | Other services | 2020 |
| UK Poultry Limited | Wholesale & retail | 2002 |
| UK Prime Solutions Ltd | Other services | 2022 |
| UK Properties & Maintenance Ltd | Construction | 2025 |
| UK RT Transaction Holdco Ltd | Manufacturing | 2026 |
| UK RUG Care Ltd | Administrative & support | 2021 |
| UK Topers Ltd | Manufacturing | 2021 |
| UK Wildlife Cameras Ltd | Wholesale & retail | 2011 |
| UK Wisdom Media Ltd | Information & communication | 2025 |
| Uk-China Trading Limited | Wholesale & retail | 2010 |
| UK360 Photo Limited | Professional & scientific | 2020 |
| Ukiyo Shooting Ltd | Wholesale & retail | 2023 |
| Ukua Logistics Ltd | Transport & logistics | 2025 |
| Ulas EN Limited | Hospitality | 2011 |
| Ulkutay & Co. Limited | Professional & scientific | 1986 |
| Ultimate Care UK Ltd | Health & social care | 2007 |
| Ultimate Fire Limited | Professional & scientific | 2019 |
| Ultra Glow Cosmetics Limited | Wholesale & retail | 1992 |
| Ultrazone Fire Systems Ltd | Professional & scientific | 2024 |
| Ulysses Property Limited | Real estate | 2015 |
| UM International Ltd | Wholesale & retail | 2026 |
| Umizad Discount Shop Ltd | Wholesale & retail | 2025 |