| Taab Ltd | Administrative & support | 2020 |
| Taaha Driving School Ltd | Other services | 2021 |
| Taaha Travel Limited | Other services | 2023 |
| Taal Food & Wines (Harrow) Ltd | Wholesale & retail | 2013 |
| Tactical Consulting Ltd | Information & communication | 2014 |
| Tactical Films Limited | Information & communication | 2017 |
| Tactician Trader Limited | Extraterritorial | 2017 |
| TAG E & P Limited | Administrative & support | 2011 |
| Tagade Limited | Wholesale & retail | 2018 |
| Taieb (London) Ltd | Other services | 2022 |
| Taieb Ltd | Other services | 2022 |
| Tain Expo Ltd | Wholesale & retail | 2023 |
| Taizhou Weiyi Motorcycle Co., Ltd | Wholesale & retail | 2019 |
| TAJ Indian Group Ltd | Manufacturing | 2026 |
| Take a Look Pictures Ltd | Information & communication | 2021 |
| Takes Care Limited | Other services | 2014 |
| Takton Bearing Co., Ltd | Administrative & support | 2022 |
| Takyshian Trading Ltd | Wholesale & retail | 2020 |
| Talati Investments Limited | Real estate | 2017 |
| Tale Spin Ltd | Wholesale & retail | 2025 |
| Taler AI Limited | Information & communication | 2024 |
| Tallatex Trading Co., Ltd. | Wholesale & retail | 2025 |
| Tallugar Ltd | Professional & scientific | 2025 |
| Tally Accountants Ltd | Professional & scientific | 2012 |
| Talulah Rose Ltd | Extraterritorial | 2017 |
| TAN & Beauty Salon Limited | Other services | 2003 |
| TAN Albion Limited | Wholesale & retail | 2026 |
| Tango Consult Limited | Information & communication | 2005 |
| Tango Publishing Limited | Information & communication | 2024 |
| Tanishk Limited | Information & communication | 2018 |
| Tannita Ltd | Wholesale & retail | 2019 |
| Tantalise Tanning Studio Ltd | Other services | 2025 |
| Tanvi Construction Services Limited | Construction | 2026 |
| TAO Group Ltd | Professional & scientific | 2018 |
| Taosim Limited | Financial services | 2018 |
| Tapley Technical Ltd. | Construction | 2018 |
| Tarvex Construction Limited | Construction | 2020 |
| Taskin Digital Ventures Ltd | Information & communication | 2026 |
| Tatter Invest Ltd | Real estate | 2026 |
| Tax RTN Ltd | Professional & scientific | 2022 |
| Taylor Black Consulting Ltd | Professional & scientific | 2015 |
| Taylor Made Builds Limited | Construction | 2024 |
| TAZ International Limited | Wholesale & retail | 1977 |
| TB Projects (LDN) Ltd | Construction | 2021 |
| TBA Contractors Ltd | Construction | 2003 |
| TBO Developments Ltd | Construction | 2023 |
| TCB Homes Limited | Professional & scientific | 2008 |
| TCH Limited | Construction | 2004 |
| TD63 Ltd | Information & communication | 2018 |
| TDC Commercial Plumbing & Heating Ltd | Construction | 2024 |
| TDC Plumbing and Heating Ltd | Construction | 2020 |
| TDD Homes Ltd | Real estate | 2025 |
| TDK Physio Limited | Other services | 2012 |
| Tdlj Corporate Limited | Real estate | 2019 |
| TE AMO Colombia Ltd | Hospitality | 2022 |
| Tea Delights Trading UK Ltd | Wholesale & retail | 2022 |
| TEAM11CONSULTING Limited | Information & communication | 2010 |
| TEB Construction Ltd | Construction | 2019 |
| Tecblaze Limited | Administrative & support | 2019 |
| Tech First Systems Limited | Other services | 2025 |
| Tech FIX and Trade Ruislip Ltd | Wholesale & retail | 2025 |
| Tech Market Insight Limited | Professional & scientific | 2017 |
| Tech Titan Limited | Wholesale & retail | 2015 |
| Techie Ninjas Ltd | Wholesale & retail | 2025 |
| Techivation Ltd | Arts & recreation | 2020 |
| Technew Ltd | Information & communication | 2022 |
| Techno 87 Limited | Wholesale & retail | 2022 |
| Technological Solutions Limited | Professional & scientific | 2010 |
| Technologist Limited | Information & communication | 2021 |
| Technoloze Limited | Information & communication | 2025 |
| Techzone Ruislip Ltd | Other services | 2022 |
| Teejay Investments Limited | Real estate | 2002 |
| Teide Records Productions Ltd | Information & communication | 2023 |
| TEK LYF Ltd | Wholesale & retail | 2025 |
| Teknica Ltd | Transport & logistics | 2022 |
| Teleinfo Limited | Other services | 2013 |
| Telesoft Ltd | Information & communication | 2020 |
| Telesteo Limited | Real estate | 2016 |
| Temitu Limited | Real estate | 2021 |
| TEN/10 Burgers & Shakes Ltd | Hospitality | 2026 |
| TEN10 HR Consulting Ltd | Professional & scientific | 2021 |
| Tenolli Ltd | Professional & scientific | 2021 |
| Tenuredirect Property Management Limited | Real estate | 1996 |
| Teri DAT Limited | Wholesale & retail | 2013 |
| Termhouse (Clarendon Court) Management Limited | Households | 1977 |
| Terrabase Paving Ltd | Administrative & support | 2020 |
| Terracotta Paving Limited | Construction | 2017 |
| Terri Trades Ltd | Professional & scientific | 2020 |
| Terry Barry Properties Ltd | Real estate | 2016 |
| Terzioglu Global Ltd | Wholesale & retail | 2023 |
| Tesla Ocean Turbine Ltd | Professional & scientific | 2021 |
| Testing Concepts Limited | Professional & scientific | 2016 |
| Tgbr Bearings Limited | Manufacturing | 2025 |
| Tgielectricalservices Ltd | Construction | 2026 |
| TGL Real Estate Ltd | Real estate | 2025 |
| TGS Cinemas Limited | Information & communication | 2024 |
| Thai Bento Express Ltd | Hospitality | 2020 |
| Thai Haven Joint Venture Ltd | Other services | 2024 |
| Thai Haven New Venture Limited | Other services | 2026 |
| Thakorji Limited | Hospitality | 2025 |