| Thedailychoice Ltd | Wholesale & retail | 2026 |
| Thedogcalmer.Com Limited | Other services | 2002 |
| Thehappyeventparties Limited | Hospitality | 2022 |
| Themed Events and Attractions Limited | Extraterritorial | 2015 |
| Theo Corporate Consultants Ltd | Professional & scientific | 2011 |
| Theobalds Cafe Ltd | Hospitality | 2018 |
| Theotet Ltd | Construction | 2018 |
| Therapy Equipment Limited | Manufacturing | 1983 |
| Therlys Investments Limited | Real estate | 2020 |
| Thermionic Culture Limited | Manufacturing | 1998 |
| Thickbroom Audit LLP | | 2025 |
| Thickbroom Coventry Limited | Professional & scientific | 2011 |
| Thickbroom Horizons LLP | | 2025 |
| Thickbroom Mortgages LLP | | 2021 |
| Thickbroom Payroll LLP | | 2025 |
| Thinplug Limited | Wholesale & retail | 2008 |
| Thinplug Trading Company Limited | Professional & scientific | 2012 |
| Thirstyfish Consultancy Limited | Information & communication | 2020 |
| Thirstyfish Limited | Information & communication | 2013 |
| THN Construction Ltd | Professional & scientific | 2015 |
| Thomas Chase Consult Group Ltd | Professional & scientific | 2009 |
| Thompsons Seafood Limited | Wholesale & retail | 2020 |
| Thorpe Grange Investments (Norwich) Limited | Construction | 2005 |
| Thorpe Grange Investments Limited | Construction | 2002 |
| Thought for Food Retail Limited | Real estate | 2005 |
| Three Mountain Ltd | Wholesale & retail | 2025 |
| Thriftmeter Limited | Wholesale & retail | 2018 |
| Thriving Humans Ltd | Professional & scientific | 2025 |
| Thurlow Health Clinics Ltd | Health & social care | 2015 |
| Tia’S Treat Aesthetics Ltd | Other services | 2024 |
| Tidalo Properties Ltd | Real estate | 2019 |
| Tides & Tranquility Ltd | Hospitality | 2025 |
| Tids Scaffolding Ltd | Construction | 2024 |
| TIG Metal Engineering Works Limited | Administrative & support | 2016 |
| TIGER87 Ltd | Water & waste | 2023 |
| Tigris Care Limited | Health & social care | 2024 |
| Tikiri Toys UK Limited | Wholesale & retail | 2017 |
| Timber Fire Doors Installations Limited | Construction | 2019 |
| Timcor Ltd | Wholesale & retail | 2021 |
| Timex Services Ltd | Construction | 2020 |
| Timnì London Ltd | Wholesale & retail | 2023 |
| Tinsley Software Holdings Limited | Financial services | 2023 |
| Tinted Limited | Construction | 2019 |
| Tintoretto Design Ltd | Professional & scientific | 2019 |
| Tinuiti UK Limited | Professional & scientific | 2014 |
| Titanium Exterior Care Limited | Administrative & support | 2026 |
| Titsol Achievers Hub Limited | Health & social care | 2025 |
| TIV TOV Ltd | Wholesale & retail | 2020 |
| Tizard Creative Limited | Arts & recreation | 2022 |
| TJ Yiacoupis Ltd | Professional & scientific | 2021 |
| TJG Consult Limited | Professional & scientific | 2022 |
| TJG Plumbing and Heating Services Ltd | Construction | 2019 |
| TJR Global Solutions Ltd | Other services | 2013 |
| TK Electrical & Automotive Ltd | Construction | 2026 |
| TKC Contracts Ltd | Construction | 2022 |
| TKM Bakers Ltd | Wholesale & retail | 2026 |
| TLT Logistic Ltd | Transport & logistics | 2018 |
| TM & GN Consulting Limited | Information & communication | 2026 |
| TMC Rendering Ltd | Construction | 2019 |
| TMH Commercial Vehicles Ltd | Transport & logistics | 1998 |
| TMK Media Services Limited | Information & communication | 2018 |
| TN Football Limited | Arts & recreation | 2019 |
| TO Stop and Stare Limited | Professional & scientific | 2019 |
| Tobli Construction Ltd | Construction | 2020 |
| Tobs Consultancy Ltd | Professional & scientific | 2019 |
| Tobs Estate Ltd | Real estate | 2018 |
| Todaj Property Ltd | Real estate | 2024 |
| Toksan UK Ltd | Professional & scientific | 2024 |
| TOM Builder Ltd | Construction | 2016 |
| TOM IZV Rendering Ltd | Construction | 2014 |
| TOM Pyke Ltd | Construction | 2023 |
| TOM Richard Phillips Ltd | Extraterritorial | 2025 |
| Tomex Services Limited | Construction | 2015 |
| Tommatt Developments (Hatfield Heath Management) Limited | Real estate | 2023 |
| Tommatt Developments Limited | Real estate | 2019 |
| Tommatt Group Limited | Real estate | 2024 |
| Tone & Glow Limited | Other services | 2025 |
| Top Class UK Services Ltd | Administrative & support | 2019 |
| Top Glaze Home Improvements Ltd | Construction | 2022 |
| Top Talent Marketing Ltd | Professional & scientific | 2025 |
| Top Tech Services Ltd | Information & communication | 2023 |
| Topio Ltd | Administrative & support | 2024 |
| Torch Marketing Company Limited | Other services | 2011 |
| Totality Capital Limited | Financial services | 2021 |
| Totally YOU Care Limited | Health & social care | 2023 |
| Totan UK Limited | Construction | 2019 |
| Totem Developments Limited | Real estate | 2016 |
| Totem MMA Limited | Administrative & support | 2019 |
| Totesforyouu Ltd | Wholesale & retail | 2025 |
| Tots Treehouse Day Nursery Ltd | Health & social care | 2021 |
| Touchmoneydaily Clothing Limited | Wholesale & retail | 2025 |
| TOV Cars Ltd | Transport & logistics | 2021 |
| Towerridge Developments Ltd | Construction | 2025 |
| Town Xtra C.I.C. | Information & communication | 2025 |
| Toyourdoorstep Ltd | Wholesale & retail | 2026 |
| Tozlukaya Holdings Ltd | Financial services | 2021 |
| TP Security & Electrical Limited | Other services | 2015 |
| TP Utilities Ltd | Construction | 2025 |
| Tpbr Freeholders Limited | Households | 2024 |
| TPE Fabrications Limited | Administrative & support | 2009 |