| TDL Trust Limited | Professional & scientific | 2023 |
| Tdl-Creative Ltd | Professional & scientific | 2016 |
| TDS Property Group Limited | Real estate | 2024 |
| Team Atman Ltd | Health & social care | 2014 |
| Team Noakes Enterprises Limited | Health & social care | 2006 |
| Team Olarch Racing Ltd | Arts & recreation | 2018 |
| TEC Developments Limited | Information & communication | 2024 |
| TEC Properties Group Ltd | Real estate | 2026 |
| Tech Bridge Services Ltd | Information & communication | 2025 |
| Tech Environment UK Ltd | Construction | 2018 |
| Tech Market Access Ltd | Information & communication | 2022 |
| Techlink International Limited | Wholesale & retail | 2009 |
| Techmates Technologies Limited | Information & communication | 2025 |
| Technical Treatments Limited | Manufacturing | 1946 |
| Technology Consultancy International Ltd | Information & communication | 2023 |
| Technology Solutions Veltrix Tech Limited | Information & communication | 2025 |
| Techwave Mobile Solutions Ltd | Wholesale & retail | 2024 |
| Teignfield Ltd | Hospitality | 2026 |
| Tekhub Ltd | Other services | 2023 |
| Telist Engineering Limited | Manufacturing | 2015 |
| Telos Reason Ltd | Information & communication | 2026 |
| Telston Business Park Ltd | Construction | 2020 |
| Telston EP Ltd | Real estate | 2024 |
| Teltu Ltd | Real estate | 2025 |
| Tempest Strategies Ltd | Professional & scientific | 2026 |
| Temple Fiduciary Services Limited | Professional & scientific | 2019 |
| Templemore Residents Limited | Households | 1987 |
| Tempus Consultancy Ltd | Information & communication | 2014 |
| TEN Albany Road Management Company Limited | Hospitality | 1989 |
| TEN Developments Limited | Real estate | 2004 |
| TEN80 PT Limited | Real estate | 2019 |
| Tenacres Security Consulting Limited | Professional & scientific | 2016 |
| Tenrocks Holding Ltd. | Professional & scientific | 2018 |
| Teqny Ltd | Real estate | 2015 |
| Tera Quantum AI Ltd | Information & communication | 2026 |
| Terra Nova Estates Limited | Real estate | 2012 |
| Terry Airport Transfer Limited | Transport & logistics | 2025 |
| Terry Blackmore Search Dogs K9 Ltd | Administrative & support | 2019 |
| Terry Day Ltd | Wholesale & retail | 2010 |
| Terry Malone Limited | Construction | 2016 |
| Tesla Owners UK Limited | Other services | 2019 |
| Tevton Limited | Real estate | 2010 |
| Texo Rail Ltd | Construction | 2025 |
| TGO Maps Ltd | Information & communication | 2019 |
| TGP Limited | Professional & scientific | 1989 |
| Thain Enterprises Limited | Professional & scientific | 2012 |
| Thames Ditton Spares Limited | Manufacturing | 1995 |
| Thames Heating Limited | Construction | 2001 |
| Thames Swan Limited | Construction | 2012 |
| Thanks LEN Group Limited | Information & communication | 2022 |
| Thanus Retail Ltd | Wholesale & retail | 2022 |
| Tharsha Retail Ltd | Wholesale & retail | 2018 |
| Thatcisoguy Ltd | Financial services | 2026 |
| THE 1 York Road Management Company Limited | Households | 1999 |
| THE 10 ST Botolphs Road Residents Company Limited | Real estate | 2000 |
| THE Academy of Experts | Extraterritorial | 1994 |
| THE Air Charter Club Limited | Transport & logistics | 2013 |
| THE Archive Company Limited | Transport & logistics | 1999 |
| THE Archway Trading Co Limited | Wholesale & retail | 1988 |
| THE Artisan Plan Ltd | Wholesale & retail | 2022 |
| THE Association of Climbing Walls (Britain) Limited | Administrative & support | 1995 |
| THE Authentic Travel Company Limited | Administrative & support | 2017 |
| THE Avon Property Centre Limited | Real estate | 2020 |
| THE Bait Room Ltd | Wholesale & retail | 2025 |
| THE Beach (Residential) Limited | Real estate | 2022 |
| THE Beach (Sevenoaks) Limited | Real estate | 2017 |
| THE Beach Limited | Real estate | 1995 |
| THE Bedfordshire Property Centre Limited | Real estate | 2020 |
| THE Beeches (IOW) Limited | Hospitality | 2024 |
| THE Beer Shop London Ltd | Hospitality | 2014 |
| THE Belvedere Clinic Limited | Health & social care | 2010 |
| THE Berkley Graphic Design Company Limited | Professional & scientific | 2017 |
| THE Berkshire Property Centre Limited | Real estate | 2020 |
| THE Better Body Shop Ltd. | Arts & recreation | 2006 |
| THE Blue Anchor PUB Ltd | Hospitality | 2023 |
| THE Blue Bean Coffee Box Ltd | Manufacturing | 2019 |
| THE Blue Bean Coffee Co. Limited | Hospitality | 2014 |
| THE BMG Partnership Ltd | Other services | 2013 |
| THE Boot Room Company (2024) Limited | Wholesale & retail | 2024 |
| THE Brand Farm Ltd | Professional & scientific | 2015 |
| THE Breeze (IOW) Developments LLP | | 2019 |
| THE Breeze Restaurant (IOW) Ltd | Hospitality | 2020 |
| THE Breeze Restaurant LLP | | 2019 |
| THE Bridge Estate Agents Limited | Real estate | 2021 |
| THE Business of Events Limited | Professional & scientific | 2023 |
| THE Business Sweet Limited | Professional & scientific | 2013 |
| THE Chandlery (IOW) LLP | | 2019 |
| THE Children's Workshop | Education | 2004 |
| THE Chocolate Shop Sevenoaks LLP | | 2017 |
| THE Circuit Board Limited | Professional & scientific | 2022 |
| THE City of London Property Centre Limited | Real estate | 2020 |
| THE Clever Dresser Limited | Wholesale & retail | 2013 |
| THE Cleves Management Ltd | Households | 2011 |
| THE Club Sportif Group Limited | Professional & scientific | 2016 |
| THE Cock at IDE Hill Ltd | Hospitality | 2015 |
| THE Company Shed Limited | Transport & logistics | 2007 |
| THE Cornwall Property Centre Limited | Real estate | 2020 |
| THE Courtyard Hodsoll Street Limited | Households | 2007 |
| THE Craft Beer MAN Ltd | Manufacturing | 2019 |
| THE Crescens Freehold Company Limited | Households | 1997 |