| TN Nails & Spa Ltd | Other services | 2021 |
| TND Estates Limited | Real estate | 2021 |
| Tobez Limited | Health & social care | 2014 |
| Tobisol Limited | Administrative & support | 2023 |
| Toby Ellis Property Consultant Ltd | Construction | 2021 |
| Toch Services Limited | Professional & scientific | 2017 |
| Tofdem Ltd | Financial services | 2009 |
| TOG Solutions Limited | Professional & scientific | 2014 |
| Tolacare Ltd | Health & social care | 2025 |
| Tolelija Limited | Construction | 2021 |
| TOM Rowland Capital Group Limited | Financial services | 2024 |
| TOM Rowland Practice Limited | Health & social care | 2024 |
| Tomtom London Removals Ltd | Transport & logistics | 2025 |
| Tomtom Removals Ltd | Transport & logistics | 2021 |
| Tonco Kent Ltd | Construction | 2019 |
| Toni Construction Services Ltd | Construction | 2025 |
| Tony Brooks Services Limited | Professional & scientific | 2000 |
| Tony Price Consulting Limited | Information & communication | 2010 |
| Toolbox Marketing Ltd | Information & communication | 2014 |
| Tooth Life Limited | Health & social care | 2024 |
| Tootle Works Ltd | Professional & scientific | 2024 |
| Top Best Cleaner Ltd | Administrative & support | 2025 |
| Top Grill & Pizza Ltd | Hospitality | 2024 |
| Top-Taak Groundworks Ltd | Financial services | 2024 |
| Topcar Design UK Ltd | Manufacturing | 2020 |
| Topclass Apartments Ltd | Hospitality | 2018 |
| Topey Spice and Grill Ltd | Hospitality | 2021 |
| Topmejt Ltd | Construction | 2012 |
| Topp Property Medway Ltd. | Real estate | 2006 |
| Topps Scaffolding Limited | Construction | 1984 |
| Topse Global Ltd | Professional & scientific | 2026 |
| Topstep Solutions Limited | Professional & scientific | 2011 |
| TOR Pettersen Limited | Financial services | 2000 |
| Torchwell Ltd | Information & communication | 2025 |
| Torculist Limited | Wholesale & retail | 2020 |
| Torilo Limited | Information & communication | 2012 |
| Torsbotech Ltd | Construction | 2025 |
| Total Accounting Kent Ltd. | Professional & scientific | 2012 |
| Total Accounting Lincolnshire Ltd. | Extraterritorial | 2018 |
| Total Accounting London Ltd. | Extraterritorial | 2017 |
| Total Accounting Online Ltd | Professional & scientific | 2021 |
| Total Accounting Surrey Ltd. | Extraterritorial | 2017 |
| Total Care TTK Limited | Health & social care | 2025 |
| Total Creation Limited | Information & communication | 2016 |
| Total Recovery Solutions Limited | Professional & scientific | 2021 |
| Total Ship Services Limited | Transport & logistics | 2002 |
| Total Tiling London Ltd | Construction | 2020 |
| Total TKS Limited | Construction | 2021 |
| Touchpoints Care Home Limited | Health & social care | 2014 |
| Toulson-Jones Jewellers Limited | Wholesale & retail | 2002 |
| Tower Estates South West Limited | Real estate | 2024 |
| Towpath Eden Limited | Hospitality | 2018 |
| TPK Electrical Services Ltd | Construction | 2025 |
| Traction Digital Ltd | Professional & scientific | 2025 |
| Train 2 Day Ltd | Education | 2012 |
| Train Zone Ltd | Wholesale & retail | 2020 |
| Training Points Fitness and Therapies Limited | Arts & recreation | 2014 |
| Training Solutions and Services Limited | Education | 2013 |
| Tranmott Solutions Limited | Other services | 2019 |
| Tranquilo Construction Limited | Construction | 2025 |
| Trans DOR Limited | Transport & logistics | 2014 |
| Transform Makeovers Limited | Wholesale & retail | 2010 |
| Transition Developments (Kent) Ltd | Construction | 2023 |
| Transportology Ltd | Transport & logistics | 2021 |
| Traton Plant Limited | Administrative & support | 2024 |
| Traveln Ltd | Administrative & support | 2025 |
| Travers Contractors Ltd | Construction | 2019 |
| Travula Ltd | Transport & logistics | 2026 |
| Tread to Thread Limited | Other services | 2013 |
| Treasurewells Accomodations Ltd | Hospitality | 2023 |
| Treesoft Ltd | Information & communication | 2003 |
| Treewise (Kent) Ltd | Administrative & support | 2025 |
| Treliving Properties Ltd | Real estate | 2024 |
| Trend Fashion Show Limited | Wholesale & retail | 2022 |
| Trend Smart Limited | Wholesale & retail | 2024 |
| Trends Healthcare & Consultancy Ltd | Administrative & support | 2024 |
| Tress Clothing Ltd. | Wholesale & retail | 2017 |
| Tressair Limited | Wholesale & retail | 2011 |
| Trestlebio Limited | Professional & scientific | 2020 |
| Trevor Philips Industries Limited | Financial services | 2025 |
| Trex Logistics Limited | Transport & logistics | 2024 |
| Tribeca Technology Group Limited | Professional & scientific | 2015 |
| Tricorp Controls Ltd | Administrative & support | 2025 |
| Trif Electrics Ltd | Construction | 2017 |
| Trigomet Ltd | Information & communication | 2026 |
| Trilogy Mechanical Services Limited | Construction | 2023 |
| Trimfix Limited | Manufacturing | 1986 |
| Trimnet Limited | Manufacturing | 2014 |
| Trimoda Limited | Real estate | 1919 |
| Trimuk Ltd | Transport & logistics | 2019 |
| Trinity Connex Ltd | Construction | 2022 |
| Trinity Surveying Limited | Administrative & support | 2015 |
| Trinity Ventures Ltd | Real estate | 2020 |
| Triple AS Consult Limited | Information & communication | 2019 |
| Triple III Care Ltd | Health & social care | 2015 |
| Triple MMM Services Ltd | Wholesale & retail | 2020 |
| Triple O Home Management Ltd | Administrative & support | 2012 |
| Triple P Homes Limited | Construction | 2025 |
| Triple-A Intel Solutions Ltd | Information & communication | 2024 |
| TRU Upvc Limited | Construction | 2009 |