| THE New Money Company Ltd | Professional & scientific | 2025 |
| THE Old Orchard Residents Limited | Households | 2002 |
| THE Result Company Ltd | Professional & scientific | 2014 |
| THE Taxi Shop Limited | Wholesale & retail | 2003 |
| THE Wealth Strategist Limited | Professional & scientific | 2021 |
| THE Wilkinson Partnership (LB) Limited | Real estate | 2022 |
| The-Beauty-Gallery- Limited | Other services | 2023 |
| This Generation Career Coaching Ltd | Other services | 2024 |
| Thought Space Partnership Ltd | Professional & scientific | 2021 |
| Thurleigh Meadows Ltd | Construction | 2026 |
| Thurleigh New Homes Ltd | Construction | 2025 |
| TLM Group Technology Limited | Extraterritorial | 2023 |
| Tower Gate UK Limited | Administrative & support | 1997 |
| Townrock Limited | Construction | 2010 |
| Townsend Management Co Ltd | Households | 2021 |
| Tprs Properties Limited | Real estate | 2022 |
| TPT Services Limited | Professional & scientific | 2022 |
| Training Management Systems Limited | Wholesale & retail | 2020 |
| TRANS4RM Consulting Limited | Professional & scientific | 2018 |
| Trigger Shoots Ltd | Professional & scientific | 2009 |
| Trowlock Solutions Limited | Professional & scientific | 2010 |
| TRU Fit Asset Management Ltd | Real estate | 2023 |
| TRU Fit Gym Group Ltd | Arts & recreation | 2023 |
| Truv Group Limited | Administrative & support | 2024 |
| Truverify UK Limited | Information & communication | 2021 |
| Tucked Automotive Ltd | Wholesale & retail | 2018 |
| UK & European Guild of Music Supervisors Limited | Arts & recreation | 2017 |
| Umuti Consulting Limited | Professional & scientific | 2013 |
| Velo E-Scooters Limited | Wholesale & retail | 2020 |
| Verby Ltd | Professional & scientific | 2024 |
| Victory Security Group Limited | Administrative & support | 2016 |
| Vinum Eurus Limited | Wholesale & retail | 2024 |
| Virtus Consultancy Limited | Professional & scientific | 2023 |
| Volaris Solutions Limited | Manufacturing | 2021 |
| Waishe Property - Holdings Ltd | Real estate | 2024 |
| Watch This Media Ltd | Information & communication | 2024 |
| WE ARE Spice Limited | Information & communication | 2015 |
| Wesley Associates Photography & Post Limited | Professional & scientific | 2021 |
| Whisky Discovery Limited | Professional & scientific | 2017 |
| Wisdom Strategy Ltd | Professional & scientific | 2022 |
| WK360 Limited | Professional & scientific | 1982 |
| Wolverton Industrial Developments Limited | Real estate | 1978 |
| Wrest Developments Limited | Construction | 2015 |
| Wrest Park 52 Limited | Extraterritorial | 2020 |
| Xotic Global Ltd | Professional & scientific | 2024 |
| Xtranet-Itsolutions Ltd | Information & communication | 2005 |
| Ynformatics Ltd | Information & communication | 2011 |
| Zebra Mortgages Limited | Financial services | 2009 |