| Techno Deals Ltd | Wholesale & retail | 2025 |
| Technology Consulting International Limited | Information & communication | 2003 |
| Technomic Limited | Information & communication | 2020 |
| Techrealtor Limited | Real estate | 2021 |
| Techsmart IT Limited | Information & communication | 2016 |
| Techura Limited | Information & communication | 2025 |
| Teddy Hayes Productions Ltd. | Arts & recreation | 2015 |
| Tejveer Limited | Wholesale & retail | 2026 |
| Teknaam Ltd | Administrative & support | 2011 |
| Teknoglue Ltd | Wholesale & retail | 2024 |
| Tello and MO Musical Ltd. | Arts & recreation | 2024 |
| Telvaris Ltd | Information & communication | 2026 |
| Temida Consortium Ltd | Financial services | 2021 |
| Tenbytes Ltd | Information & communication | 2024 |
| Tenderbot Limited | Information & communication | 2025 |
| Tendril Limited | Hospitality | 2019 |
| Tera Tera Limited | Real estate | 2019 |
| Terra Dynamic Ltd | Professional & scientific | 2016 |
| Tesseract Growth Ltd | Professional & scientific | 2025 |
| Testforce UK Limited | Information & communication | 2014 |
| TF Runners Ltd | Transport & logistics | 2021 |
| TGM Education Limited | Hospitality | 2022 |
| TH Implants Limited | Health & social care | 2023 |
| TH Sumal LLP | | 2016 |
| Thaimarketing Ltd | Professional & scientific | 2025 |
| Thakar Enterprises Ltd | Wholesale & retail | 2007 |
| Thakar Estates Ltd | Real estate | 2017 |
| Thakar Store Ltd | Wholesale & retail | 2015 |
| Thamizhavai | Other services | 2020 |
| That Prize Chick Ltd | Administrative & support | 2026 |
| THE 8TH Stand Consulting Ltd | Administrative & support | 2019 |
| THE Advert GUY Ltd | Professional & scientific | 2026 |
| THE Art of Food Ltd | Hospitality | 2015 |
| THE Audition Platform Limited | Administrative & support | 2020 |
| THE Berlin Doner Limited | Hospitality | 2014 |
| THE Brick Shed Ltd | Wholesale & retail | 2017 |
| THE Brusa Foundation Ltd | Arts & recreation | 2022 |
| THE Business Concept (London) Ltd | Administrative & support | 2016 |
| THE Carpet Company Isleworth Limited | Wholesale & retail | 2015 |
| THE Cedar Marlow Limited | Hospitality | 2005 |
| THE Centre for Nepalese and Gurkhas Ltd | Information & communication | 2010 |
| THE Cinnamon Lounge (Isleworth) Limited | Other services | 2009 |
| THE Cloud Networks Limited | Information & communication | 2004 |
| THE Conscious Gardening Company Limited | Administrative & support | 2022 |
| THE Coup Limited | Extraterritorial | 2006 |
| THE Craft Cabin Limited | Wholesale & retail | 2011 |
| THE Creatives and Expression Ltd | Financial services | 2021 |
| THE Curator Property Management Ltd | Real estate | 2025 |
| THE Event Palette Ltd | Hospitality | 2024 |
| THE Fifty Derby Road Management Company Limited | Real estate | 2018 |
| THE Flying One Limited | Wholesale & retail | 2018 |
| THE Foal Group Limited | Financial services | 2025 |
| THE Frankincense Store Limited | Wholesale & retail | 2011 |
| THE Gadget Outfit Ltd | Wholesale & retail | 2025 |
| THE Global Mastery Limited | Education | 2025 |
| THE Green Door Project Ltd | Professional & scientific | 2019 |
| THE Green School Trust | Education | 2013 |
| THE Grind Productions Limited | Information & communication | 2012 |
| THE Haywood Hain LLP | | 2008 |
| THE House of Fandango Ltd | Wholesale & retail | 2020 |
| THE Human Equation Ltd | Professional & scientific | 2025 |
| THE Jersey Practice Limited | Health & social care | 2006 |
| THE Kazbah (London) Ltd | Hospitality | 2019 |
| THE Knowledge Exchange Ltd | Professional & scientific | 2016 |
| THE Latebloomers Theatre Company Ltd | Arts & recreation | 2025 |
| THE Leak Freaks Ltd | Construction | 2025 |
| THE Little Project Management Company Ltd | Information & communication | 2022 |
| THE London Property Hub Ltd | Real estate | 2023 |
| THE London Tutoring Company Ltd. | Education | 2017 |
| THE Long Lane Theatre Company Limited | Arts & recreation | 2022 |
| THE Mind Health Doctor Limited | Health & social care | 2025 |
| THE Modular Chips Security and Research Group Ltd | Information & communication | 2023 |
| THE Mulberry Centre | Health & social care | 2005 |
| THE Nathanson Partnership Limited | Professional & scientific | 2019 |
| THE Nathanson Partnership Property Services Ltd | Real estate | 2023 |
| THE Old Blue School Limited | Households | 2024 |
| THE Paper Party BAG Shop Ltd | Manufacturing | 2020 |
| THE Party Cake Ltd | Wholesale & retail | 2020 |
| THE Richmond Medical Practice Limited | Health & social care | 2012 |
| THE Snug Weymouth Limited | Hospitality | 2026 |
| THE Stay Company Group Ltd | Real estate | 2025 |
| THE Sticky Studio LLP | | 2025 |
| THE Taxation Station Limited | Professional & scientific | 2015 |
| THE Treasure Boxes Ltd | Manufacturing | 2025 |
| THE Tyre Rack Auto Repair Limited | Wholesale & retail | 2025 |
| THE Unicorn Mediaa Limited | Information & communication | 2024 |
| THE Unlimited Law Ltd | Professional & scientific | 2022 |
| THE VM Services Group Limited | Information & communication | 2025 |
| Thefirstone Limited | Information & communication | 2024 |
| Theflutes Ltd | Hospitality | 2013 |
| Thenergy Ltd | Professional & scientific | 2011 |
| These Studios Ltd | Information & communication | 2022 |
| Think Being Ltd | Information & communication | 2022 |
| Third Lane Consulting Limited | Professional & scientific | 2006 |
| Thistleworth Financial Limited | Financial services | 2015 |
| Thistleworth Marine Limited | Households | 1973 |
| Thom AD Limited | Arts & recreation | 2025 |
| Thomas Family Homes Ltd | Construction | 2026 |
| Thorn Logic Ltd | Professional & scientific | 2026 |
| Thornbury Park Friends CIC | Arts & recreation | 2022 |