| Think B.I.G. Import & Export Ltd. | Financial services | 2019 |
| Thinknest Education Limited | Education | 2026 |
| Thiya Stores Limited | Wholesale & retail | 2026 |
| Thomson Schultz Limited | Manufacturing | 1975 |
| Threadmuse Ltd | Wholesale & retail | 2025 |
| Threadology Ltd | Manufacturing | 2017 |
| Thrill IT Ltd | Hospitality | 2025 |
| Thrive Healthcare Awareness and Education CIC | Education | 2025 |
| Thrive Healthcare Awareness, Training and Education Ltd | Education | 2023 |
| Thrive Together Academy Ltd | Administrative & support | 2024 |
| Tictock Limited | Real estate | 2025 |
| Tide and Brew Ltd | Hospitality | 2026 |
| Tidewareai Limited | Information & communication | 2025 |
| Tidy Touch Cleanify Ltd | Administrative & support | 2025 |
| Tifeka Limited | Manufacturing | 2025 |
| Tiga London Ltd | Wholesale & retail | 2018 |
| Tiger Fancy Light Ltd | Wholesale & retail | 2025 |
| Tihami Ltd | Wholesale & retail | 2025 |
| Tile Galaxy Ltd | Wholesale & retail | 2015 |
| Tilewala Ltd | Wholesale & retail | 2022 |
| Timberland Building Supplies Ltd | Wholesale & retail | 2023 |
| Time 4 Hours Ltd | Transport & logistics | 2016 |
| Time Engineering Limited | Manufacturing | 2013 |
| Times Security & Facilitator Ltd | Professional & scientific | 2024 |
| Timshel Consulting Ltd | Professional & scientific | 2021 |
| Timshel Property Ltd | Real estate | 2019 |
| Timsuk Limited | Education | 2025 |
| Timus Construction Ltd | Construction | 2020 |
| Tiptop Toys Ltd | Wholesale & retail | 2021 |
| Tirmizi Ltd | Wholesale & retail | 2023 |
| TIS Investments Ltd | Real estate | 2025 |
| Titan Build London Ltd | Construction | 2025 |
| Titan Crest Roofing Ltd | Construction | 2026 |
| Titan Freight Ltd | Transport & logistics | 2022 |
| Titanium Associates Ltd | Information & communication | 2019 |
| Tiverton Construction Limited | Construction | 2003 |
| Tiverton Designs Limited | Wholesale & retail | 2012 |
| TJ Boughan Malsian Choba UK Ltd | Construction | 2011 |
| Tjgj Properties Ltd | Real estate | 2022 |
| TJX Solutions Ltd | Financial services | 2025 |
| TK Travel & Tours Limited | Administrative & support | 2026 |
| TK9 Ltd | Wholesale & retail | 2026 |
| TKD02 Ltd | Construction | 2020 |
| TKG Fitness Ltd | Arts & recreation | 2020 |
| TKS Enterprise Ltd | Real estate | 2018 |
| TM Movement Ltd | Transport & logistics | 2025 |
| Tmss UK Limited | Wholesale & retail | 2021 |
| TN Citylink Limited | Transport & logistics | 2026 |
| TNG Constructions Ltd | Construction | 2026 |
| Toda Partners Limited | Professional & scientific | 2019 |
| Tokai Logistics Services Ltd | Transport & logistics | 2026 |
| Toniverse Ltd | Arts & recreation | 2021 |
| Toofaan Logistics Ltd | Transport & logistics | 2025 |
| Toolsum Limited | Wholesale & retail | 2022 |
| Toosi Travel Ltd | Administrative & support | 2017 |
| Top Auto Paints Ltd | Wholesale & retail | 2025 |
| Top Gift Ltd | Wholesale & retail | 2011 |
| Top Globals Ltd | Professional & scientific | 2025 |
| Top Horizon Education Ltd | Education | 2022 |
| Top N Palace Ltd | Wholesale & retail | 2020 |
| Top Paradise Construction Ltd | Construction | 2025 |
| Top Star Ltd | Wholesale & retail | 2012 |
| Top Talent Recruitment Limited | Administrative & support | 2015 |
| Top Voyages Ltd | Administrative & support | 2025 |
| Topfitt Limited | Wholesale & retail | 2012 |
| Topmooncommercial Ltd | Construction | 2024 |
| Tops Pizza Hub Ltd | Manufacturing | 2026 |
| Tosh RAI Logistics Ltd | Transport & logistics | 2025 |
| Tota Contractors Ltd | Construction | 2021 |
| Total Build Materials Ltd | Wholesale & retail | 2025 |
| Total Fresh Limited | Wholesale & retail | 2023 |
| Total Group Worldwide Ltd | Manufacturing | 2019 |
| Touch of Angels Limited | Construction | 2023 |
| Touchwood Homes London Limited | Real estate | 2021 |
| Toys Mart Limited | Wholesale & retail | 2009 |
| Toys Warehouse UK Limited | Wholesale & retail | 2025 |
| Toysrex UK Ltd | Wholesale & retail | 2018 |
| TPS Home Solutions Ltd | Construction | 2013 |
| TRADE2GATHER Ltd | Wholesale & retail | 2024 |
| Tradenova Machinery Private Ltd | Wholesale & retail | 2025 |
| Tradewick Property Limited | Real estate | 2026 |
| Tradewise Management Services Ltd | Professional & scientific | 2023 |
| Trading and Investment Ltd | Administrative & support | 2016 |
| Tradition of Oxford Ltd | Wholesale & retail | 2025 |
| Transacz Ltd | Financial services | 2025 |
| Transfer Service London Limited | Transport & logistics | 2020 |
| Transport J Ltd | Transport & logistics | 2020 |
| Trapezium 888 Ltd | Hospitality | 2024 |
| Travel Paradise Limited | Administrative & support | 2017 |
| Travel Time Service Limited | Administrative & support | 2016 |
| Traveledge Ltd | Administrative & support | 2016 |
| Travels Factory Limited | Administrative & support | 2022 |
| Treesavers Ltd | Professional & scientific | 2008 |
| Trending Investments Ltd | Real estate | 2025 |
| Trendtote Ltd | Wholesale & retail | 2026 |
| Trendy Diva Boutique Ltd | Wholesale & retail | 2018 |
| Treno Properties Limited | Real estate | 2009 |
| TRI Brothers Enterprise UK Ltd | Wholesale & retail | 2020 |
| Trial Enterprise Ltd | Wholesale & retail | 2018 |
| Triarch Limited | Administrative & support | 2025 |