| Tream Tech Ltd | Information & communication | 2014 |
| Treasuresome Ltd | Wholesale & retail | 2025 |
| Treasurestash Ltd | Wholesale & retail | 2024 |
| Treatwiser Limited | Wholesale & retail | 2021 |
| Treldor Limited | Professional & scientific | 2025 |
| Trelwin Limited | Professional & scientific | 2025 |
| Tremsky Ltd | Professional & scientific | 2013 |
| Trendessence Ltd | Wholesale & retail | 2024 |
| Trendicon Ltd | Wholesale & retail | 2025 |
| Trendy Garage Ltd | Wholesale & retail | 2025 |
| Trendy Motors Limited | Wholesale & retail | 2023 |
| Trendyythreads Ltd | Wholesale & retail | 2025 |
| Tress Partners Limited | Administrative & support | 2022 |
| Treverton Limited | Real estate | 2020 |
| TRI Leaf Security Limited | Professional & scientific | 2026 |
| Triangle Construction Group Limited | Construction | 2024 |
| Triangle Three Limited | Real estate | 2014 |
| Triekanda Properties Limited | Financial services | 1962 |
| Triggerforge Ltd | Other services | 2024 |
| Trikki Limited | Wholesale & retail | 2009 |
| Triland Properties Limited | Real estate | 2002 |
| Trim & Shave Limited | Other services | 2025 |
| Trimburn Limited | Professional & scientific | 2025 |
| Trinal Energy Ltd | Professional & scientific | 2018 |
| Trinal Properties Ltd | Real estate | 2025 |
| Trinity DC Limited | Construction | 2023 |
| Trinity Dental Surgery Limited | Health & social care | 2009 |
| Trinity Holding Group Ltd | Financial services | 2020 |
| Trinity Stone Management Limited | Real estate | 2024 |
| Trio Estates Partnership LLP | | 2015 |
| Trio Investment Partners Limited | Financial services | 2021 |
| Trio V3NTURES Ltd. | Wholesale & retail | 2019 |
| Tripass Ltd | Administrative & support | 2026 |
| Triple AAA Limited | Wholesale & retail | 2006 |
| Trishul Kitchen Limited | Hospitality | 2026 |
| Triumph in Care Ltd | Health & social care | 2025 |
| Trivedi Incorporation Limited | Real estate | 2022 |
| Troika Property Ltd | Real estate | 2021 |
| Tropical Fruits and VEG Limited | Wholesale & retail | 2025 |
| Tropical Holidays Limited | Administrative & support | 2016 |
| Trsr Trading Ltd | Wholesale & retail | 2019 |
| TRU Electrical Services Ltd | Construction | 2012 |
| Tru-Line Interiors Ltd | Construction | 2021 |
| Trucks From the UK Limited | Wholesale & retail | 2019 |
| True Care Foundation Limited | Administrative & support | 2009 |
| True Connect Networks Limited | Construction | 2023 |
| True Flooring Ltd | Construction | 2021 |
| True Home Pizza Ltd | Hospitality | 2025 |
| True Living Home Care Ltd | Health & social care | 2020 |
| Trunks and a Richard Ltd | Construction | 2025 |
| Trusbest Ltd | Real estate | 2023 |
| Trusswalker Limited | Information & communication | 2008 |
| Trust Autos Ltd | Wholesale & retail | 2025 |
| Trusted Food Consultancy Ltd | Hospitality | 2022 |
| Trusteddesi Limited | Information & communication | 2025 |
| Trustwell Properties Limited | Real estate | 2025 |
| TRZ Security Ltd | Financial services | 2023 |
| TS Housing Solutions Ltd | Real estate | 2024 |
| Tsit Limited | Information & communication | 2023 |
| TSJ Westonzoyland Food Corner Ltd | Hospitality | 2025 |
| Tsubaru Limited | Construction | 2018 |
| TTB Properties Ltd | Real estate | 2015 |
| Ttda London Ltd | Education | 2024 |
| TTT Trading Ltd | Financial services | 2024 |
| Tuck and Tonic Ltd. | Hospitality | 2015 |
| Tudcom Professionals Ltd. | Construction | 2015 |
| Tulja Bhavani Decorator Limited | Construction | 2024 |
| Tully's Boxing Club Ltd | Arts & recreation | 2016 |
| Tully's MMA Club Ltd | Arts & recreation | 2017 |
| Tulsi K Vyas Limited | Extraterritorial | 2024 |
| Tulsi Tailoring Shop Limited | Manufacturing | 2024 |
| Tulula Limited | Wholesale & retail | 2020 |
| Tunbridge Wells Elite Limited | Transport & logistics | 2020 |
| Tunbridge Wells Gogo Ltd | Hospitality | 2025 |
| TURBO-3 Limited | Professional & scientific | 2020 |
| Turi Halal Meat Ltd | Wholesale & retail | 2025 |
| Turkemani Properties Ltd | Real estate | 2024 |
| Turkish Doner Grill Ltd | Hospitality | 2025 |
| Turmeric Ltd | Wholesale & retail | 2010 |
| Turning Circle Cars Limited | Wholesale & retail | 2023 |
| Turnkey Living Ltd | Real estate | 2025 |
| Turnkey Mortgage Solutions Limited | Financial services | 2021 |
| Turnpike Global Ltd | Professional & scientific | 2026 |
| Tutivity Ltd | Administrative & support | 2025 |
| Tutulan Design Ltd | Professional & scientific | 2022 |
| Tuxedo Members Club Limited | Wholesale & retail | 2025 |
| TWB Internet Services Limited | Information & communication | 2014 |
| Twenty Two Holdco Ltd | Financial services | 2020 |
| Twick Limited | Information & communication | 2017 |
| Twiga Trading Limited | Other services | 2019 |
| Twin Tech Hub Ltd | Wholesale & retail | 2023 |
| Twins Building Services Limited | Construction | 2012 |
| Twins Trade Ltd | Wholesale & retail | 2025 |
| Twiss UP Beverages Limited | Wholesale & retail | 2020 |
| Two Stray Cats Ltd | Real estate | 2023 |
| Two Zero Eight Swim School Aquatics Limited | Arts & recreation | 2025 |
| TXE Express Ltd | Wholesale & retail | 2025 |
| TY International Ltd | Wholesale & retail | 2017 |
| Tyler Energy Ltd | Wholesale & retail | 2015 |
| Tylrco Limited | Administrative & support | 2022 |