| THE HUT London Ltd | Other services | 2023 |
| THE Italian Dream Weddings and Events Ltd | Hospitality | 2022 |
| THE Lamb PUB Ltd | Hospitality | 2019 |
| THE Loud Ones Ltd. | Administrative & support | 2024 |
| THE MAY Tree Professional Health & Beauty Limited | Other services | 2007 |
| THE Nurture Circle Ltd | Professional & scientific | 2021 |
| THE Old Dairy Printing Company Limited | Manufacturing | 1999 |
| THE Polish Building Company Ltd | Construction | 2009 |
| THE Possibilists Ltd | Professional & scientific | 2023 |
| THE POT Model Ltd | Wholesale & retail | 2023 |
| THE Prop Shop London Ltd | Administrative & support | 2025 |
| THE PUB Movie Ltd | Information & communication | 2022 |
| THE Racehorse Carshalton Ltd | Hospitality | 2025 |
| THE Railway Tavern (Carshalton) Ltd | Hospitality | 2014 |
| THE Retail Academy Ltd | Administrative & support | 2016 |
| THE Reveals Factory Ltd | Professional & scientific | 2024 |
| THE Richmen Traders Int'L Ltd | Manufacturing | 2025 |
| THE Screen Film Ltd | Information & communication | 2026 |
| THE Social Diaries London Ltd | Administrative & support | 2025 |
| THE Spiney Limited | Health & social care | 2020 |
| THE Surrey Directories Group Limited | Information & communication | 2009 |
| THE Swan Club Limited | Health & social care | 2024 |
| THE Test Station (Carshalton) Limited | Wholesale & retail | 2026 |
| THE Trading Counter Ltd | Wholesale & retail | 2022 |
| THE Traveling Trim Ltd | Other services | 2025 |
| THE UK Richmen Group of Companies International Ltd | Wholesale & retail | 2025 |
| THE UW Workbench Limited | Information & communication | 2025 |
| THE Vine Stays Limited | Hospitality | 2025 |
| THE Warwick Hotel Ltd | Hospitality | 2026 |
| THE Web Psychologist Ltd | Professional & scientific | 2011 |
| THE Yellow Welly Company Ltd | Construction | 2025 |
| Therahousing Limited | Real estate | 2023 |
| Think Safeguarding Ltd | Professional & scientific | 2024 |
| Thivy Engineering Ltd | Professional & scientific | 2016 |
| Thomas Clarke Building & Decorating Services Ltd | Construction | 2012 |
| Thompson-Rye Ventures Ltd | Information & communication | 2025 |
| Three Four Eight Limited | Health & social care | 2015 |
| Thulasi Investments Ltd | Real estate | 2024 |
| Time to Clean Ltd | Administrative & support | 2012 |
| TIP Top Nails Rosehill Limited | Other services | 2017 |
| Titan Scaffolding Service Ltd | Water & waste | 2024 |
| TJF Plumbing & Heating Ltd | Construction | 2025 |
| TJM Groundworks & Landscaping Ltd | Administrative & support | 2011 |
| Tkare Homes Ltd | Health & social care | 2026 |
| Tkonsult Ltd | Professional & scientific | 2019 |
| TLT Plumbing Ltd | Manufacturing | 2015 |
| TLW Construction Ltd | Construction | 2017 |
| TM Renovations Ltd | Construction | 2012 |
| TMP Analytics Ltd | Information & communication | 2025 |
| Toddlers Today Limited | Extraterritorial | 2017 |
| Tolfe Consultants Limited | Financial services | 2012 |
| Tolfe Sugarcraft (Supported Learning) Ltd | Education | 2016 |
| Tomas UK Builders Ltd | Construction | 2014 |
| Toosights Ltd | Professional & scientific | 2024 |
| Top Cat Productions Ltd | Arts & recreation | 2010 |
| Top Class JOB Ltd | Construction | 2025 |
| Top Tier Build & Landscapes Ltd | Administrative & support | 2024 |
| Toppus Group Limited | Wholesale & retail | 2019 |
| Total Care Training Limited | Administrative & support | 2008 |
| Total Solution Provider Ltd | Construction | 2023 |
| Touchpoint Medical Limited | Wholesale & retail | 2011 |
| Touchstone (Surrey) Ltd | Construction | 2019 |
| Toy Heroes Limited | Wholesale & retail | 1996 |
| Tptcm Global Limited | Agriculture & fishing | 2025 |
| Trackside Productions Ltd | Administrative & support | 2012 |
| Trade Experts Network Ltd | Professional & scientific | 2014 |
| Tradent Ltd | Health & social care | 2015 |
| Traditional Spice Ltd | Hospitality | 2019 |
| Transform With AI Ltd | Professional & scientific | 2025 |
| Transition Workways Ltd | Information & communication | 2018 |
| Treadstone Surrey Ltd | Households | 2019 |
| Trepic Scaffolding Services Ltd. | Administrative & support | 2017 |
| Trichy Consulting Ltd | Information & communication | 2021 |
| Trinity Ace Limited | Professional & scientific | 2017 |
| Trust Cleaning Ltd | Other services | 2012 |
| Trust Services Limited | Other services | 2016 |
| TS Painting and Decorating Ltd | Construction | 2026 |
| TTS Assets Ltd | Real estate | 2024 |
| Tuayos Ltd | Professional & scientific | 2023 |
| Tudor Cafe Ltd | Hospitality | 2015 |
| Two Lions Media Limited | Information & communication | 2013 |
| TY Construction Services Limited | Construction | 2023 |
| U.O Solutions Ltd | Hospitality | 2024 |
| Ua-Cleaning Ltd | Administrative & support | 2024 |
| Uduak Limited | Health & social care | 2023 |
| UFO Roots and Routes Limited | Administrative & support | 2025 |
| UK Bathrooms and Plumbing Ltd | Construction | 2021 |
| UK Home Care Limited | Health & social care | 2018 |
| UK PAK Traders Ltd | Manufacturing | 2025 |
| UK Plaza Investments Ltd | Real estate | 2018 |
| UK Tooting Limited | Wholesale & retail | 2018 |
| Ukiza Limited | Financial services | 2017 |
| UMD Professional Limited | Education | 1998 |
| Under the Coco Tree Limited | Information & communication | 2012 |
| Unimama Limited | Education | 2023 |
| Unique Kleaning Services Ltd | Administrative & support | 2025 |
| Unique Windows (London) Limited | Construction | 2006 |
| Unitcooké Ltd. | Wholesale & retail | 2021 |
| United Metropolitan Consulting Ltd | Professional & scientific | 2011 |
| Unveil London Events Ltd. | Hospitality | 2025 |