| TEK Electrical Ltd | Construction | 2020 |
| Tenx AI Limited | Information & communication | 2023 |
| Thames Lofts Ltd | Construction | 2013 |
| THE Acute Investments Company Limited | Information & communication | 2003 |
| THE Advertising Consultancy Limited | Extraterritorial | 2002 |
| THE Coaching Academy U.K. Limited | Education | 2000 |
| THE Foundation for Circulatory Health | Health & social care | 2003 |
| THE Innate Business Limited | Information & communication | 2003 |
| THE Otto Connection Ltd | Other services | 2021 |
| THE Thames Explorer Trust | Education | 1989 |
| THE Yummy Palette Limited | Wholesale & retail | 2017 |
| Thornton Avenue Properties Limited | Real estate | 1952 |
| Tlfi Limited | Education | 2017 |
| Torbury Properties Limited | Real estate | 1976 |
| TPZ Estates Ltd | Real estate | 2026 |
| Trafalgar Technical Services Ltd | Information & communication | 2022 |
| Transform HR Limited | Administrative & support | 2013 |
| Triventure Films (Mansion Mystery) Limited | Information & communication | 2024 |
| TS Transformation Ltd | Professional & scientific | 2026 |
| TSM24 Ltd | Transport & logistics | 2017 |
| Ttec Consulting (UK) Limited | Professional & scientific | 1997 |
| Ulza Building Ltd | Construction | 2022 |
| Upliftr Ltd | Professional & scientific | 2025 |
| Videsigns Ltd | Information & communication | 2021 |
| Virtually Sports Ltd | Information & communication | 2020 |
| Warriors Support Ltd | Information & communication | 2015 |
| Wembury House Freehold Limited | Households | 2006 |
| West London Solutions Limited | Information & communication | 2011 |
| Whiteley Buro Limited | Manufacturing | 2012 |
| Whitman & Co Lettings Limited | Real estate | 2018 |
| Wild Bush Chiswick Limited | Hospitality | 2025 |
| Willowdens Limited | Households | 1986 |
| XL Talent Limited Liability Partnership | | 2007 |
| Yells Cafe LLP | | 2013 |
| Zanrose Textiles Limited | Wholesale & retail | 1996 |