| THE Build Wise Development Ltd | Construction | 2024 |
| THE Business Alchemists Ltd | Professional & scientific | 2011 |
| THE Chakravarty CUP Limited | Other services | 2006 |
| THE Chicken Salt Company Ltd | Wholesale & retail | 2019 |
| THE Co. Network UK Ltd | Administrative & support | 2024 |
| THE Direct Design Studio Limited | Professional & scientific | 1989 |
| THE Drunken Jockeys Ltd | Hospitality | 2021 |
| THE Evolution of Punk Records Ltd | Extraterritorial | 2014 |
| THE Export Department Ltd. | Information & communication | 2014 |
| THE Expressive Child Ltd | Health & social care | 2017 |
| THE Feline Tribe Ltd | Wholesale & retail | 2023 |
| THE Fitness Studio Surrey Limited | Arts & recreation | 2026 |
| THE Folding PEN Ltd | Information & communication | 2025 |
| THE Happy Habit Ltd | Health & social care | 2025 |
| THE International Instrument Users' Association | Administrative & support | 1982 |
| THE Jones Collection Ltd | Wholesale & retail | 2025 |
| THE Language LAB Ltd | Education | 2022 |
| THE Latent Space Department Ltd | Information & communication | 2026 |
| THE Lepton Foundation Limited | Information & communication | 2013 |
| THE Little Limes Day Nursery Ltd | Health & social care | 2016 |
| THE London Cuppa Limited | Wholesale & retail | 2000 |
| THE Ludo Press Limited | Manufacturing | 2012 |
| THE Manager Hub Ltd | Professional & scientific | 2020 |
| THE Nail Crush Ltd | Other services | 2024 |
| THE Natural and Organic Family Ltd | Wholesale & retail | 2018 |
| THE Nest Day Nursery Ltd | Health & social care | 2014 |
| THE Online Administrator Ltd | Administrative & support | 2022 |
| THE Outdoor Living Group (UK) Limited | Construction | 2015 |
| THE Payments Hub Limited | Wholesale & retail | 2025 |
| THE Pinnancle Carer Solutions Ltd | Health & social care | 2026 |
| THE Revolution 3121 Ltd | Other services | 2023 |
| THE Sauna Studios Ltd | Arts & recreation | 2026 |
| THE Seahorse Projects Company Limited | Professional & scientific | 2024 |
| THE SIX of US Ltd | Wholesale & retail | 2023 |
| THE Sweetness Ltd | Information & communication | 2012 |
| THE Trunk Bottle Company Ltd | Wholesale & retail | 2021 |
| THE Tutt Consultancy Ltd | Professional & scientific | 2026 |
| THE Value Car Centre Limited | Wholesale & retail | 2002 |
| THE Verb Shop Ltd | Information & communication | 2015 |
| THE Weir Hotel (UK) Limited | Administrative & support | 2017 |
| THE World of Driving Ltd | Education | 2024 |
| Thearclight Limited | Construction | 2016 |
| Thepaceclub Ltd | Wholesale & retail | 2025 |
| Therapy Plaza Ltd | Health & social care | 2020 |
| Thesilvervixens Ltd | Other services | 2025 |
| Think Big ACT NOW Ltd | Administrative & support | 2024 |
| THIR13EN Solutions Limited | Construction | 2015 |
| Thirdeye Consulting Limited | Information & communication | 2010 |
| Thirdeye Nests Limited | Real estate | 2019 |
| This IS Ardent Ltd | Manufacturing | 2020 |
| This IS Live Ltd | Arts & recreation | 2024 |
| Three Spheres Management Ltd | Information & communication | 2016 |
| Three Trees Consultancy Limited | Professional & scientific | 2019 |
| Thrive Together Psychotherapy Ltd | Health & social care | 2025 |
| Thriving Uniqueness Ltd | Other services | 2024 |
| Thumbstop Social Ltd | Professional & scientific | 2023 |
| Tigerfit Ltd | Arts & recreation | 2025 |
| Tigerlily Phoenix Ltd | Wholesale & retail | 2024 |
| Tillbrook Creative Limited | Arts & recreation | 2017 |
| Tillers and Sons Ltd | Water & waste | 2024 |
| TIM Richards Architects Limited | Professional & scientific | 2021 |
| Tina-Lee Mcdougall Ltd | Professional & scientific | 2019 |
| Titan Built Limited | Construction | 2026 |
| Tixiworld Ltd | Wholesale & retail | 2021 |
| Tjrk Limited | Financial services | 2017 |
| TK Associates UK Ltd | Professional & scientific | 2007 |
| TMT Partners LLP | | 2018 |
| TN Plumbing & Heating Renewables Limited | Construction | 2024 |
| Todds Property Group Limited | Real estate | 2019 |
| Toli Design & Build Ltd | Transport & logistics | 2021 |
| TOM Cass Beautiful Homes Ltd | Construction | 2019 |
| TOM Hornsby Limited | Administrative & support | 2003 |
| TOM Mellish Location Services Ltd | Information & communication | 2017 |
| TOM Plumb London Limited | Construction | 2015 |
| TOM Plumb Ltd | Construction | 2021 |
| Tooting BEC Football Club Ltd | Arts & recreation | 2024 |
| Top Property Solutions Surrey Ltd | Construction | 2025 |
| Topline Music Ltd | Arts & recreation | 2003 |
| Topps Collectibles Ltd | Wholesale & retail | 2025 |
| Tops Pizza Walton Limited | Hospitality | 2022 |
| Torlyn Energy Consultants Limited | Professional & scientific | 2012 |
| Touchdown Promotions Limited | Administrative & support | 1993 |
| Tournament Finder Limited | Arts & recreation | 2018 |
| Toybox Day Nursery Limited | Education | 2009 |
| TPC Financial Management Limited | Financial services | 2015 |
| TR Nixon Builders Limited | Construction | 2003 |
| Trade MUG Ltd | Wholesale & retail | 2023 |
| Tradeeaze Limited | Professional & scientific | 2021 |
| Trading 8S Limited | Professional & scientific | 2011 |
| Trading London Limited | Wholesale & retail | 2013 |
| Treasure Mail Ltd | Information & communication | 2020 |
| Treasury Consulting Partners Ltd | Administrative & support | 2013 |
| Treemendous Limited | Professional & scientific | 2025 |
| Tresco Kapital Limited | Real estate | 2017 |
| Trevista Ltd | Information & communication | 2025 |
| Tribe Properties Limited | Real estate | 2018 |
| Trident Commercials Ltd | Wholesale & retail | 2025 |
| Triway Developments Ltd | Real estate | 2019 |
| Troya Limited | Information & communication | 2014 |
| True Vision Property Ltd | Construction | 2024 |