| THE Solution Group (Engineering) Limited | Administrative & support | 2016 |
| THE Sporting Wine Club Limited | Wholesale & retail | 2015 |
| THE Sports & Musculoskeletal Clinic Limited | Health & social care | 2024 |
| THE Square CUT Limited | Construction | 2022 |
| THE Station Master Limited | Wholesale & retail | 2009 |
| THE Stove & Fireplace Limited | Other services | 2017 |
| THE Suya Factory Limited | Hospitality | 2018 |
| THE T-Shirt Shop Ltd | Other services | 2011 |
| THE Thames Wharfinger Co. Limited | Transport & logistics | 1995 |
| THE Thinking Schools Academy Trust | Education | 2010 |
| THE Thurrock Scrap Company Limited | Professional & scientific | 1987 |
| THE Tool Hire Centre Limited | Administrative & support | 2018 |
| THE Total Package Experience Ltd Ltd | Health & social care | 2023 |
| THE Tripplek Ltd | Real estate | 2023 |
| THE Tyndale Group Ltd | Wholesale & retail | 2025 |
| THE UK Confederation of Hypnotherapy Organisations Ltd. | Other services | 2000 |
| THE UK Dome Company Ltd | Other services | 2021 |
| THE Upnor Pier Limited | Hospitality | 2006 |
| THE Whole WHO Limited | Information & communication | 2012 |
| THE Willows Angling Centre Ltd. | Agriculture & fishing | 2016 |
| THE Wind in the Willows Limited | Wholesale & retail | 2012 |
| THE Witchink Hour Ltd | Other services | 2025 |
| THE Wonder LAB Academy Ltd | Education | 2025 |
| THE Wonder LAB Project C.I.C. | Education | 2024 |
| THE WOW BUS Ltd | Health & social care | 2025 |
| THE Yellow Giraffe Limited | Hospitality | 2019 |
| THE Yotti Collection Ltd | Wholesale & retail | 2019 |
| Thecurrykitchen Ltd | Hospitality | 2023 |
| Thedrainbro Ltd | Water & waste | 2026 |
| Theotokos Healthcare Services (THS) Ltd | Health & social care | 2024 |
| Theresa Michael Medical Ltd | Health & social care | 2024 |
| Thermal Energy Systems International Limited | Professional & scientific | 2006 |
| Thermovistauk Limited | Administrative & support | 2020 |
| Thesixtysix Ltd | Manufacturing | 2016 |
| Theyouthworker Ltd | Education | 2016 |
| Think Tall Training Limited | Education | 2008 |
| Thinking Home Ltd | Other services | 2017 |
| Thinking Solutions for Education Limited | Education | 2018 |
| Thintech Group Limited | Information & communication | 2019 |
| Thintech Limited | Information & communication | 2006 |
| Thintech Services Ltd | Wholesale & retail | 2024 |
| Tholoyi Ventures Ltd | Wholesale & retail | 2025 |
| Thomas Air Conditioning Limited | Construction | 2015 |
| Thomas Enabling Limited | Construction | 2013 |
| Thompson Alexander Limited | Administrative & support | 2014 |
| Thompson Operations Ltd | Hospitality | 2023 |
| Thompsor Investments Ltd | Professional & scientific | 2025 |
| Thompsor Properties Ltd | Real estate | 2025 |
| Thomsen Properties Limited | Construction | 2013 |
| Thor Architecture Ltd | Information & communication | 2018 |
| Threat Protect Limited | Information & communication | 2018 |
| Three a Brothers Ltd | Real estate | 2024 |
| Three Legged Enterprises Limited | Manufacturing | 2006 |
| Threebuilders Developments Ltd | Construction | 2017 |
| Thriving Well Limited | Hospitality | 2026 |
| TIA Recruitment Ltd | Administrative & support | 2025 |
| Tide Sisters Limited | Health & social care | 2024 |
| Tiek Consultant Ltd | Professional & scientific | 2019 |
| Tiger Blue Travel Limited | Administrative & support | 2013 |
| Tikka Truck Ltd | Hospitality | 2025 |
| Tilemaster Tunbridge Wells Ltd | Households | 2015 |
| Tiller and Wheel C.I.C. | Administrative & support | 2019 |
| Tilly’S HR Consultancy Ltd | Professional & scientific | 2022 |
| Tilt Media Limited | Professional & scientific | 2011 |
| Timber Mouldings Limited | Administrative & support | 1967 |
| Time 4 U Group Ltd | Real estate | 2018 |
| Time 4 U Ltd | Hospitality | 2011 |
| Time to Shine Detailing Ltd | Administrative & support | 2024 |
| TIME4U Companionship Services Ltd | Administrative & support | 2021 |
| TIME4U Housing Solutions Ltd | Real estate | 2018 |
| Timetec TA UK Ltd | Wholesale & retail | 2021 |
| Timtek Restaurant Ltd | Hospitality | 2026 |
| Tina Rowe Art Ltd | Information & communication | 2006 |
| TINIX2 Platinium Group Ltd | Health & social care | 2026 |
| Tinuola Foods Ltd | Wholesale & retail | 2023 |
| Tiog Solutions Ltd. | Administrative & support | 2015 |
| TIP Top Plumbing & Heating Limited | Construction | 2015 |
| TIP Top Skips Ltd | Water & waste | 2020 |
| Tipno Limited | Agriculture & fishing | 1980 |
| Tiptop Property Group Ltd | Real estate | 2026 |
| Tiscox Limited | Extraterritorial | 2011 |
| Titiconnect Limited | Health & social care | 2021 |
| Titus Farm Developments Ltd | Construction | 2021 |
| Titus Logistics Ltd | Transport & logistics | 2025 |
| Tiwala Limited | Administrative & support | 2019 |
| TJB Scaffolding Services Ltd | Construction | 2017 |
| TJD & D Consulting Ltd | Information & communication | 2014 |
| TJM Electrical Solutions Ltd | Construction | 2025 |
| TJS Properties Limited | Real estate | 2015 |
| TK & Clinton Care Services Ltd | Health & social care | 2016 |
| TK Treasure Properties Ltd | Real estate | 2024 |
| TKO Group Limited | Professional & scientific | 2023 |
| TKV Work Ltd | Construction | 2023 |
| Tkwl Ltd | Professional & scientific | 2014 |
| TL Global Construction Ltd | Construction | 2016 |
| TLC Shopper Ltd | Wholesale & retail | 2026 |
| TLP Homes Ltd | Real estate | 2024 |
| TM Skincare Clinic Limited | Other services | 2017 |
| TMD Telecom Limited | Information & communication | 2016 |
| TMH 50 Ltd | Construction | 2021 |