| Tmra Developments Ltd | Real estate | 2014 |
| Tmra Grill Ltd | Hospitality | 2025 |
| TO the NO Shows Media Ltd | Arts & recreation | 2024 |
| Tobi Travel Europe Ltd | Administrative & support | 2024 |
| TOM Cheeseman Personal Training Limited | Health & social care | 2015 |
| Tomkolbe Ltd | Professional & scientific | 2023 |
| Tonable Technologies Ltd | Information & communication | 2026 |
| Tongda Global Logistics Ltd | Transport & logistics | 2024 |
| Tongdak Ltd | Hospitality | 2017 |
| Tonghouk Limited | Wholesale & retail | 2015 |
| Toom-Bi Limited | Manufacturing | 2023 |
| Tooth DOC Limited | Health & social care | 2022 |
| Top Coffee Shop Ltd | Wholesale & retail | 2020 |
| Top Deals Trader Ltd | Wholesale & retail | 2020 |
| Top MRI Limited | Wholesale & retail | 2018 |
| Top Tutors London Ltd | Education | 2020 |
| Tophurst Ltd | Financial services | 2022 |
| Total Agency Ltd. | Transport & logistics | 2022 |
| Tours for My Kids Ltd | Administrative & support | 2017 |
| Townbridge House (Weymouth) Limited | Hospitality | 2007 |
| Tpstudios Limited | Information & communication | 2024 |
| Tracy Borman Inc Limited | Arts & recreation | 2017 |
| Trade Villages Limited | Wholesale & retail | 2025 |
| Tradeblox Limited | Information & communication | 2025 |
| Traditional Foods Distribution Ltd | Wholesale & retail | 2026 |
| Traditional Music Foundation | Arts & recreation | 2013 |
| Traditional Tasty Bar Ltd | Hospitality | 2025 |
| Tragail Freehold Limited | Real estate | 2004 |
| Tragail Residents Management Co.Limited | Households | 1967 |
| Trakin Limited | Information & communication | 2017 |
| Traveltrust UK Ltd | Administrative & support | 2023 |
| Treestoneuk Limited | Wholesale & retail | 2024 |
| Trendjackers LLP | | 2016 |
| Trendpay Ltd | Administrative & support | 2019 |
| Tresstales Ltd | Other services | 2025 |
| Trevara Estates Limited | Hospitality | 2012 |
| Trevitek Ltd | Professional & scientific | 2022 |
| Triblack Limited | Real estate | 2021 |
| Tribuild London Limited | Construction | 2019 |
| Tried & True TOO Limited | Hospitality | 2017 |
| Tried and True Coffee Limited | Hospitality | 2011 |
| Trillion Run Travel & Consulting Limited | Administrative & support | 2012 |
| Trio-Bro Ltd | Extraterritorial | 2017 |
| Triple-Co Ltd | Wholesale & retail | 2019 |
| Triune Consulting Limited | Information & communication | 2017 |
| Triune Ltd | Real estate | 2014 |
| Triune Properties Limited | Real estate | 2020 |
| Trocair Ltd | Information & communication | 2026 |
| Troia IT Consultancy Ltd | Information & communication | 2018 |
| Tros Retail Solutions Ltd | Wholesale & retail | 2024 |
| Tryon (UK) Limited | Real estate | 1998 |
| Tuition Contigo Online Ltd | Education | 2026 |
| Turtle Diving Limited | Arts & recreation | 2026 |
| TW & UK Ltd | Hospitality | 2021 |
| Twelve Rabbits Ltd | Professional & scientific | 2017 |
| Twelvehd Consulting Limited | Professional & scientific | 2019 |
| Twiddle Technologies Ltd | Professional & scientific | 2023 |
| Twiss Drinks Limited | Manufacturing | 2010 |
| Two Magnolias Creative Ltd | Professional & scientific | 2020 |
| Two Magnolias Ltd | Professional & scientific | 2019 |
| UK Avionics Limited | Manufacturing | 2026 |
| UK Dream Tour Ltd | Administrative & support | 2023 |
| UK Hello Travel Ltd | Administrative & support | 2018 |
| UK Jungwoo Pharm & Healing TCM Ltd | Wholesale & retail | 2020 |
| UK Korean Residents Society CIC | Hospitality | 2026 |
| UK Linkers Limited | Wholesale & retail | 2016 |
| UK Miracle Tour Ltd | Administrative & support | 2023 |
| UK Property Trading Corporation Limited | Construction | 2002 |
| UK Reit Limited | Real estate | 2021 |
| UK Sarangbang Ltd. | Administrative & support | 2003 |
| UK Vision Tour Ltd | Administrative & support | 2018 |
| Uk-China Cigar Association Ltd | Professional & scientific | 2025 |
| UK50 Ltd. | Education | 2025 |
| Ukbest Construction Limited | Construction | 2018 |
| UKO Academy Ltd | Education | 2026 |
| Uktourzone Ltd | Wholesale & retail | 2012 |
| Ultimate Projects and Maintenance Ltd | Construction | 2020 |
| Ultra Bathroom Installations Ltd | Construction | 2020 |
| Ultra Plumbing and Heating Services Limited | Construction | 2019 |
| Ultramarine Solutions Limited | Professional & scientific | 2019 |
| Umeria Ltd | Professional & scientific | 2014 |
| Unbeatable GK Ltd | Wholesale & retail | 2022 |
| Undefinedluxury Limited | Wholesale & retail | 2018 |
| Unilifestyle Ltd | Real estate | 2024 |
| Union JAX Foundation | Professional & scientific | 2018 |
| Union Trade Service Ltd | Wholesale & retail | 2022 |
| Unitas Clinic Ltd | Health & social care | 2026 |
| United Construction and Remodeling Ltd | Construction | 2019 |
| United Indigo Ltd | Wholesale & retail | 2016 |
| Universal Corp Ltd | Extraterritorial | 2018 |
| Unlmtd Electric & Fire Ltd | Construction | 2025 |
| Unzx Ltd | Professional & scientific | 2026 |
| Upper Brook Street Limited | Hospitality | 2025 |
| Upsy Daisy Media Ltd | Professional & scientific | 2024 |
| Urban GAS Limited | Construction | 2013 |
| Urban Haus Limited | Real estate | 2011 |
| Urimental Ltd | Wholesale & retail | 2024 |
| Uskd Consultants Ltd | Information & communication | 2012 |
| Utility Derivatives Limited | Financial services | 1999 |
| V & M Guildford Ltd | Wholesale & retail | 2022 |