| THE Startup Sanctuary Limited | Information & communication | 2024 |
| THE Stone Tile Emporium Limited | Wholesale & retail | 2011 |
| THE Studio Cheam Ltd | Education | 2024 |
| THE Success Profile Ltd | Information & communication | 2026 |
| THE Surrey Sound of Music Ltd. | Education | 2012 |
| THE Sutton Store Ltd | Wholesale & retail | 2009 |
| THE Sutton Van Centre Limited | Wholesale & retail | 2026 |
| THE Talent Agency Limited | Arts & recreation | 2011 |
| THE Tracery Freehold Limited | Professional & scientific | 2012 |
| THE Traditional Group (Surrey) Limited | Wholesale & retail | 2010 |
| THE Tree Company (London) Limited | Professional & scientific | 1999 |
| THE UK HIP HOP Museum Ltd | Arts & recreation | 2023 |
| THE Vape Station Ltd | Wholesale & retail | 2018 |
| THE Village Shutter Company Ltd | Wholesale & retail | 2025 |
| THE Village Table Ltd | Hospitality | 2025 |
| THE Virtual Group Limited | Professional & scientific | 1995 |
| THE Waste Consultancy Limited | Water & waste | 2007 |
| THE Wellness Garden Estate Ltd | Wholesale & retail | 2024 |
| THE Wheatsheaf Ewell Ltd | Hospitality | 2020 |
| THE Willow Learning Trust | Education | 2011 |
| THE Worshipful Company of Lightmongers Charitable Trust Limited | Other services | 2013 |
| THE Worshipful Company of Lightmongers' Events Company Limited | Other services | 2013 |
| THE Yellow Box Theatre Ltd | Arts & recreation | 2019 |
| Thecut Ltd | Administrative & support | 2024 |
| Thegatekeeper Ltd | Education | 2016 |
| Thegoga Ltd | Wholesale & retail | 2022 |
| Theone Properties Limited | Real estate | 2017 |
| Theorem Facades Ltd | Construction | 2023 |
| Thesh Ltd | Hospitality | 2026 |
| Thevapelife Ltd | Wholesale & retail | 2022 |
| Thevy Ltd | Real estate | 2025 |
| Thiashola Limited | Wholesale & retail | 2025 |
| Thiashola UK Ltd | Wholesale & retail | 2025 |
| Thicket Estates Limited | Households | 2015 |
| Think Vintage Ltd | Other services | 2019 |
| Think Vintage Online Ltd | Wholesale & retail | 2024 |
| Think-A-Way Consulting Limited | Professional & scientific | 2020 |
| Thinkbase Limited | Information & communication | 2021 |
| Thinkfinity Global Ltd | Wholesale & retail | 2025 |
| Third Line Support Ltd | Information & communication | 2022 |
| Thirty One Limited | Other services | 2023 |
| This Country Home Ltd | Other services | 2025 |
| Thiselton Creative Limited | Professional & scientific | 2018 |
| Thornbrook Holdings Limited | Financial services | 2025 |
| Thornhaven Ltd | Wholesale & retail | 2025 |
| Thoth Financial Advisory Limited | Professional & scientific | 2022 |
| Thrase Properties Limited | Construction | 1960 |
| Thread & Needle Studios Ltd | Professional & scientific | 2024 |
| Three C (UK) Limited | Professional & scientific | 2011 |
| Three Magic Words Ltd | Financial services | 2013 |
| Threeways Petrol Station Limited | Wholesale & retail | 2002 |
| Thresult Solutions Ltd | Professional & scientific | 2006 |
| Thrive Property Group Limited | Real estate | 2017 |
| Thummar Consultancy Limited | Construction | 2015 |
| Thummar Ltd | Real estate | 2023 |
| Thusa & Co Ltd | Wholesale & retail | 2011 |
| THW Motor Services Ltd | Wholesale & retail | 2020 |
| Tiamia Ltd | Health & social care | 2017 |
| Tibbatts & Co Limited | Hospitality | 2016 |
| TIC Services Limited | Administrative & support | 2009 |
| Tick Tick Tikka Ltd | Hospitality | 2022 |
| Tick Trend Limited | Extraterritorial | 2011 |
| Tiddley Tots Ltd | Education | 2023 |
| Tierney Court and Sinclair Court (Croydon) Management Company Limited | Households | 1983 |
| Tierneys Caterers (Sutton) Ltd | Hospitality | 2019 |
| Tiger House Management Limited | Real estate | 2018 |
| Tiger King Theatre Ltd | Administrative & support | 2025 |
| Tiggy Design Ltd | Wholesale & retail | 2019 |
| Tikaza Ltd | Households | 2019 |
| Tiling Corp Ltd | Construction | 2015 |
| TIM Cooper Publishing Ltd | Wholesale & retail | 2021 |
| TIM Loves Art Ltd | Arts & recreation | 2017 |
| TIM Loves Music Ltd | Information & communication | 2019 |
| TIM Loves Wine Ltd | Wholesale & retail | 2016 |
| TIM the Roofer Ltd | Construction | 2025 |
| Time & Again Events Ltd | Administrative & support | 2026 |
| Timeless Flooring Ltd | Administrative & support | 2013 |
| Timeless Recruitment Solutions Limited | Administrative & support | 2017 |
| Timelord Landscaping Ltd | Administrative & support | 2023 |
| Timeridge Limited | | 1977 |
| Times Beauty HUT Ltd | Other services | 2022 |
| Timoor Cafe & Grill Ltd | Hospitality | 2025 |
| Tintshield Limited | Wholesale & retail | 2013 |
| Tinytriangle Engineering Ltd | Information & communication | 2023 |
| Tinytriangle Estates Ltd | Real estate | 2026 |
| Tippytop Limited | Wholesale & retail | 2016 |
| Titan Roofing & Guttering Limited | Construction | 2025 |
| Tiutiurlistan Ltd | Information & communication | 2025 |
| TIW Fabrications Limited | Manufacturing | 2014 |
| TJ Digital Ltd | Information & communication | 2014 |
| TJ Group Holdings Ltd | Financial services | 2025 |
| TJ Group Management Ltd | Administrative & support | 2025 |
| TJ Harrington Electrical Limited | Construction | 2026 |
| TJ SPV1 Ltd | Real estate | 2025 |
| Tjcb Properties Limited | Construction | 2021 |
| TJF Gardeners Limited | Administrative & support | 2020 |
| TJP Carpentry and Construction Ltd | Construction | 2018 |
| TK Ghar Ltd | Real estate | 2023 |
| TK Scaffolding Solutions Ltd | Construction | 2025 |
| TK Worldwide Limited | Health & social care | 2013 |