| Tudor Court Freehold Gloucester Limited | Households | 2020 |
| Tudor Rusu Ltd | Transport & logistics | 2015 |
| Tudor Wealth Limited | Professional & scientific | 2022 |
| Tuffdata Limited | Information & communication | 2009 |
| Tuffley Dental Practice Limited | Health & social care | 2026 |
| Tuffmour Management Company Limited | Households | 1998 |
| Tulpa Ltd | Information & communication | 2022 |
| Tundeeshop Ltd | Wholesale & retail | 2018 |
| Turgut Properties Limited | Real estate | 2024 |
| Turini Promotions Limited | Arts & recreation | 2007 |
| Turn UP Care Limited | Health & social care | 2019 |
| Turner Family Property Holdings Ltd | Real estate | 2025 |
| Turner Holdings (South West) Ltd | Construction | 2026 |
| Turner Race Developments Ltd | Wholesale & retail | 2013 |
| Turtlehomes.Co.Uk Limited | Construction | 2007 |
| Tuxedo Junction Limited | Wholesale & retail | 2003 |
| Tweenhills Contracting Limited | Agriculture & fishing | 2025 |
| Tweenhills Farm + Stud Limited | Agriculture & fishing | 1995 |
| Twelveten Limited | Professional & scientific | 2015 |
| Twickenham Sound Studios Limited | Information & communication | 2001 |
| Twiga Limited | Professional & scientific | 1997 |
| Twisting Spirits Ltd | Manufacturing | 2016 |
| Two for Joy Coffee Ltd | Manufacturing | 2022 |
| Two Magpies Tattoo Ltd | Other services | 2023 |
| Two Tacky Wives Ltd | Wholesale & retail | 2025 |
| Twyver Business Services Limited | Administrative & support | 2021 |
| Twyver Developments Ltd | Construction | 2025 |
| Twyver Mews Management Company Limited | Households | 1989 |
| TY Gwen Properties Ltd | Construction | 2021 |
| Tyano Limited | Administrative & support | 2012 |
| Tycoon Property Limited | Real estate | 2021 |
| Tydee Contractors Limited | Agriculture & fishing | 2001 |
| Tydenay Limited | Transport & logistics | 2025 |
| Tyga Incorporated Ltd | Real estate | 2025 |
| Tyler Crown and Bridge Limited | Manufacturing | 1996 |
| Tyler J Roofing Company Ltd | Construction | 2025 |
| Typedash Software Ltd | Information & communication | 2026 |
| Typhoon Court Management Limited | Households | 2025 |
| Tyrant Films Ltd | Information & communication | 2018 |
| Tyre and Battery Centre Limited | Wholesale & retail | 2004 |
| Tyre Square (Wholesale & Retail) International Limited | Wholesale & retail | 2024 |
| Tyrer Haslam Associates Ltd | Financial services | 2016 |
| Tyro Group UK Ltd | Financial services | 2026 |
| TYT Consulting (UK) Ltd | Professional & scientific | 2025 |
| Tytan PG Limited | Manufacturing | 2025 |
| TZ 4X4 Limited | Administrative & support | 2019 |
| U & S Property Investment Ltd | Real estate | 2026 |
| U S Venture Limited | Hospitality | 2024 |
| U-Turn Consultancy Ltd | Professional & scientific | 2024 |
| Uber Contracts Limited | Construction | 2014 |
| Uber Moose Limited | Wholesale & retail | 2010 |
| Uber Union Ltd | Professional & scientific | 2023 |
| Ubiquitize Ltd | Information & communication | 2020 |
| Ufirst Care Services Limited | Health & social care | 2021 |
| UK Baby Store Limited | Wholesale & retail | 2025 |
| UK Boss Barber Ltd | Other services | 2023 |
| UK Construction Recruitment Limited | Extraterritorial | 2006 |
| UK Cyber Team CIC | Information & communication | 2026 |
| UK Hydraulics Ltd | Professional & scientific | 2022 |
| UK Nextday Ltd | Wholesale & retail | 2021 |
| UK Plant Rental Limited | Extraterritorial | 2008 |
| UK Recruitment GB Limited | Administrative & support | 2006 |
| UK School of Skin Excellence Ltd | Education | 2020 |
| UK Starfish Ltd | Wholesale & retail | 2023 |
| UK Stone Supplies Limited | Extraterritorial | 2014 |
| Ukaltromart Ltd | Wholesale & retail | 2025 |
| Ukhaf Technology Ltd | Information & communication | 2014 |
| Ukids Eduvision Ltd | Education | 2025 |
| Ukunda Care Limited | Health & social care | 2024 |
| Uley Radiology Ltd | Health & social care | 2016 |
| Ullenwood Bharat Cricket Club | Arts & recreation | 2018 |
| Ullenwood Court Management Limited | Households | 2021 |
| Ullenwood Investments Limited | Real estate | 2015 |
| Ultimate Accident Repair Services Limited | Wholesale & retail | 2016 |
| Ultimate AM Holdings Ltd | Administrative & support | 2019 |
| Ultimate Independence Care Ltd | Health & social care | 2020 |
| Ultimate Landscapes Gloucester Ltd | Administrative & support | 2024 |
| Ultra Builds Ltd. | Construction | 2021 |
| Ultra Radiance Ltd | Wholesale & retail | 2024 |
| Ultra Vision Fire & Security Ltd | Construction | 2015 |
| Umbrella Talent Limited | Professional & scientific | 2012 |
| UMI PAN Asian Kitchen Limited | Hospitality | 2024 |
| UNA Architectural Limited | Professional & scientific | 2024 |
| Unathi Care Ltd | Health & social care | 2026 |
| Unbound Solutions Ltd | Administrative & support | 2015 |
| UNBR3KABLE Empire Ltd | Information & communication | 2024 |
| UNBR3KABLE Ltd | Wholesale & retail | 2019 |
| Unbranded Ltd | Manufacturing | 2025 |
| Uncrewed Tech Ltd | Administrative & support | 2021 |
| Underground Bunker Ltd | Construction | 2025 |
| Underhill Consulting Ltd | Professional & scientific | 2024 |
| UNI Houseware Ltd | Wholesale & retail | 2026 |
| Uni-Com Computer Solutions Limited | Information & communication | 2005 |
| Uni-Tect Limited | Construction | 2005 |
| Unify Camps Ltd | Health & social care | 2026 |
| Unika Ltd | Hospitality | 2024 |
| Unique Building Solutions Ltd | Construction | 2015 |
| Unique by Monique Ltd | Real estate | 2025 |
| Unique SW Ltd | Construction | 2024 |
| Unit 25 - Unit 34 Brunel Court Management Company Limited | Real estate | 2004 |