| T. Cribb & Sons (Markfields) Limited | Other services | 2011 |
| Table Finance UK Limited | Financial services | 2018 |
| Talbot Designs Limited | Manufacturing | 1960 |
| Taliare Limited | Wholesale & retail | 2013 |
| TAP London Limited | Information & communication | 2014 |
| Targon Limited | Professional & scientific | 1999 |
| Taste of Greece London Limited | Hospitality | 2024 |
| Tasty Inn Limited | Hospitality | 2013 |
| Taylor Hassan Limited | Other services | 2012 |
| Telegraph-Road Cycling Ltd | Wholesale & retail | 2009 |
| Telex (Holdings) Limited | Professional & scientific | 2024 |
| Telex EM Limited | Professional & scientific | 2018 |
| Telex Limited | Professional & scientific | 2012 |
| Telex PDQ Limited | Professional & scientific | 2018 |
| Telex Siteworks Connect Limited | Professional & scientific | 2024 |
| Telex UK Limited | Administrative & support | 2005 |
| Telex USA Limited | Professional & scientific | 2023 |
| Teyjas Enterprises Ltd | Wholesale & retail | 2022 |
| THE Aquatic Design Centre International Limited | Other services | 2009 |
| THE Askew Jewellery Company Ltd. | Wholesale & retail | 1991 |
| THE Boxing DEN ABC Ltd | Administrative & support | 2017 |
| THE Burlington Clinic Ltd | Health & social care | 2026 |
| THE De-Extinction Company Ltd | Information & communication | 2022 |
| THE DEN Antiques Ltd | Wholesale & retail | 2019 |
| THE DEN Kitchen Ltd | Hospitality | 2019 |
| THE Electrical Services Team Ltd | Construction | 2019 |
| THE Emily Todhunter Collection Ltd. | Arts & recreation | 1998 |
| THE Famous Crown Didsbury Limited | Hospitality | 2019 |
| THE Famous Crown Limited | Hospitality | 2019 |
| THE GB Water Company Limited | Water & waste | 2023 |
| THE Golang GUY Limited | Professional & scientific | 2018 |
| THE Greenmark Alliance Limited | Information & communication | 2026 |
| THE Harford Building LLP | | 2011 |
| THE Harford Building Residential LLP | | 2012 |
| THE Housing Reviews Limited | Administrative & support | 2004 |
| THE LMR Partnership Limited | Information & communication | 2009 |
| THE Maintenance Services Team Limited | Construction | 2020 |
| THE Measure Agency Limited | Wholesale & retail | 2002 |
| THE Merchandise Consultants Limited | Professional & scientific | 2019 |
| THE New North London Synagogue | Other services | 2002 |
| THE OCG Group Limited | Financial services | 2025 |
| THE Trading Desk Limited | Professional & scientific | 2020 |
| THE Yoga Bar Ltd | Other services | 2017 |
| Theme Creative Limited | Professional & scientific | 2022 |
| Third Dimension International Limited | | 1992 |
| Thomas House (I.O.W.) Limited | Real estate | 2017 |
| Thoughtful Thinking Limited | Health & social care | 2021 |
| Tiamoamore Ltd | Manufacturing | 2023 |
| Timeless Lusso Limited | Wholesale & retail | 2025 |
| Timeless Tailor Ltd | Other services | 2023 |
| Timmermann Limited | Professional & scientific | 2026 |
| Timothy Dunn Flowers Limited | Wholesale & retail | 1997 |
| Timothy Dunn London Limited | Wholesale & retail | 2011 |
| Tiora Limited | Wholesale & retail | 2019 |
| Titan Global Capital Limited | Financial services | 2019 |
| Titch Holdings Limited | Real estate | 2020 |
| TIW Group Limited | Information & communication | 2002 |
| TMS Corporation Ltd | Arts & recreation | 2017 |
| TO Augment Limited | Other services | 2019 |
| Toby Lane LLP | | 2013 |
| Toby Lane Residential LLP | | 2014 |
| Todhunter Earle Limited | Administrative & support | 1994 |
| Together WE Innovate New Style Limited | Extraterritorial | 2006 |
| Top Journey Services Ltd | Transport & logistics | 2020 |
| TOS Group Holdings Ltd | Financial services | 2022 |
| Traffic Management Holdings Ltd | Financial services | 2021 |
| Traffic Management Logistics Ltd | Public administration | 2010 |
| Tribal Tent Ltd | Other services | 2019 |
| Truedeal Ltd | Wholesale & retail | 2001 |
| Trusteo Limited | Professional & scientific | 2023 |
| Tucano Urbano Ltd | Wholesale & retail | 2008 |
| Twelve Two Limited | Professional & scientific | 2024 |
| U-Neek Office Supplies Limited | Manufacturing | 1993 |
| Ubidigital Ltd | Information & communication | 2012 |
| UK Language Schools Ltd | Education | 2025 |
| Uni-Plan Financial Planning Consultancy Limited | Professional & scientific | 1974 |
| Unique AV Solutions Limited | Construction | 2012 |
| Unique Capital Consultants Limited | Other services | 2017 |
| Universal Liquor Mart (London) Ltd | Wholesale & retail | 2008 |
| Utipad Limited | Manufacturing | 2023 |
| V M Investment London Ltd | Construction | 2024 |
| Valenz Holdings Limited | Manufacturing | 2019 |
| Validity Reporting Services Ltd | Administrative & support | 2020 |
| Vertechs Global Limited | Administrative & support | 2019 |
| Veterans Skills Academy CIC | Hospitality | 2021 |
| Viciti Limited | Professional & scientific | 2016 |
| Viper Communications Limited | Information & communication | 2017 |
| Vista Black Ltd | Other services | 2019 |
| Vitruvi Limited | Construction | 2016 |
| W1H Holdings Limited | Financial services | 2022 |
| W1H Properties Limited | Real estate | 2022 |
| Wahooti Holdings Limited | Professional & scientific | 2019 |
| Walcon Building & Maintenance Services Ltd | Construction | 1996 |
| Wards of London Holding Limited | Financial services | 2026 |
| Warren Elsmore Ltd | Arts & recreation | 2009 |
| Warrior Brands Ltd | Construction | 2019 |
| Watermill Wellness Centre Ltd | Real estate | 2021 |
| Webkingz Limited | Information & communication | 2013 |
| Websters International Publishers Limited | Information & communication | 1984 |
| Webwish Limited | | 2005 |