| Tanai Tiling Ltd | Administrative & support | 2020 |
| Tando Creative Limited | Wholesale & retail | 2009 |
| TB and Sons Services Limited | Administrative & support | 2023 |
| Tbre Associates Limited | Administrative & support | 2009 |
| TBS Courtesy Limited | Administrative & support | 2020 |
| TCD Construction UK Limited | Real estate | 2014 |
| TCS Screeding London Ltd | Extraterritorial | 2014 |
| Tecc Group Limited | Financial services | 2021 |
| Teccuk Limited | Construction | 2011 |
| Tech Sell and Services Ltd | Wholesale & retail | 2026 |
| Techsmart Solutions Limited | Information & communication | 2010 |
| Techsys Holdings Limited | Financial services | 2021 |
| Tegruk Limited | Health & social care | 2022 |
| Telekom Labs Limited | Administrative & support | 2010 |
| TEN Music and Production Limited | Information & communication | 2025 |
| Terry Ireland Investments Limited | Real estate | 2014 |
| Terrys Group Ltd | Construction | 2022 |
| Thai Emperor Swanley Ltd | Hospitality | 2025 |
| Thames Road Developments Limited | Real estate | 2023 |
| Thamesmead Business Services Limited | Wholesale & retail | 1967 |
| Thanet Way 1 Limited | Construction | 2026 |
| Thanet Way Holdings Limited | Financial services | 2026 |
| THE Abrams Business Solutions Ltd | Transport & logistics | 2023 |
| THE Active Community Hub CIC | Administrative & support | 2025 |
| THE Ambient Branding Company Limited | Administrative & support | 1997 |
| THE Beeshed Ltd | Manufacturing | 2010 |
| THE Beknown Agency Ltd | Professional & scientific | 2018 |
| THE Birches Nursery Limited | Health & social care | 2026 |
| THE Blue Shop Limited | Extraterritorial | 2024 |
| THE Boron Company Ltd. | Professional & scientific | 2011 |
| THE Celine Spa Limited | Other services | 2023 |
| THE Cheeseboard Limited | Wholesale & retail | 2022 |
| THE Collective Recruitment Group Limited | Administrative & support | 2010 |
| THE Complete Carpentry Co (UK) Limited | Construction | 2004 |
| THE Coventry and Rugby Hospital Company Nominee Limited | Financial services | 2001 |
| THE Coventry and Rugby Hospital Company PLC | Administrative & support | 2002 |
| THE COW Bell Limited | Wholesale & retail | 2025 |
| THE Cutting Company (Sidcup) Limited | Other services | 2003 |
| THE Dorothy Marshall Dance Studios Limited | Arts & recreation | 2005 |
| THE Firefighter Foundation | Information & communication | 2014 |
| THE Gifted Stationery Company Ltd | Information & communication | 2007 |
| THE Glass Shop (London) Limited | Wholesale & retail | 2013 |
| THE Great British Card Company (Gbcc) Limited | Information & communication | 2001 |
| THE Hospital Company (Southmead) Holdings Limited | Professional & scientific | 2009 |
| THE Hospital Company (Southmead) Limited | Health & social care | 2009 |
| THE Indoor Golf Company Limited | Extraterritorial | 2023 |
| THE International Plastic Modellers' Society (UK) | Arts & recreation | 1996 |
| THE Janjala LLP | | 2023 |
| THE Jones Group (UK) Limited Ltd | Water & waste | 2020 |
| THE KB Collective Ltd | Real estate | 2025 |
| THE Kettle Kids Jewellery Limited | Wholesale & retail | 2021 |
| THE KK LAB Limited | Wholesale & retail | 2021 |
| THE London Flower MAN Co Ltd | Wholesale & retail | 2025 |
| THE Luxefoodco Limited | Hospitality | 2023 |
| THE Manor House Mgmt Co RTM Company Limited | Households | 2023 |
| THE Network Emea Limited | Information & communication | 2014 |
| THE Noypi Chef Ltd | Hospitality | 2022 |
| THE Property Platform Limited | Information & communication | 2020 |
| THE Q S Practice Limited | Professional & scientific | 2013 |
| THE Right Space Connected Limited | Real estate | 2025 |
| THE Right Space Property Investment Ltd | Real estate | 2025 |
| THE Side Curtain Company Limited | Manufacturing | 2015 |
| THE Software Bureau Limited | Information & communication | 1993 |
| THE Spark & Hammer Ltd | Construction | 2026 |
| THE Taunton Linac (Holdings) Company Limited | Professional & scientific | 2005 |
| THE Taunton Linac Company Limited | Administrative & support | 2005 |
| THE Walsall Hospital Company (Holdings) Limited | Professional & scientific | 2007 |
| THE Walsall Hospital Company PLC | Administrative & support | 2007 |
| THE Wellness Group Limited | Health & social care | 2019 |
| THE White House Chipstead Limited | Construction | 2016 |
| THE Willows (Swanley) Management Company Limited | Households | 2004 |
| Theultimategroup Ltd | Other services | 2016 |
| Thirtyone:Eight | Health & social care | 1991 |
| Thomas Belll Carriages Ltd | Wholesale & retail | 2025 |
| Thomas Wood & Sons Limited | Administrative & support | 1911 |
| Thriving Families and Youths CIC | Education | 2025 |
| Timecorp Limited | Wholesale & retail | 2021 |
| Timophy Healthcare Services Ltd | Health & social care | 2013 |
| Titan Biological Ltd | Wholesale & retail | 2022 |
| Titan Build Ltd | Construction | 2019 |
| Tjlm Limited | Other services | 2018 |
| Tlsc Holding Limited | Financial services | 2025 |
| Tngl PS Limited | Information & communication | 2014 |
| Tool Tips Ltd | Arts & recreation | 2025 |
| Top Floor Textiles Limited | Professional & scientific | 2022 |
| Total Cleaning Services Kent Limited | Households | 2011 |
| Total Coldroom Solutions Ltd | Construction | 2021 |
| Total Results Fitness Limited | Arts & recreation | 2013 |
| Tower Design and Print Limited | Administrative & support | 2007 |
| Tower Leaflet Distribution Limited | Professional & scientific | 2013 |
| Traditional Build Ltd | Construction | 2003 |
| Trail Active Fire Protection Limited | Administrative & support | 2016 |
| Trail Construction Ltd | Extraterritorial | 2017 |
| Trail Electrical Services Ltd | Construction | 2017 |
| Trail Fire & Security Limited | Public administration | 2017 |
| Trail Group Limited | Construction | 2004 |
| Trail Guarding Services Limited | Administrative & support | 2025 |
| Trail Holdings Limited | Construction | 2014 |
| Transform Schools (Bassetlaw) Holdings Limited | Financial services | 2005 |
| Transform Schools (Bassetlaw) Limited | Administrative & support | 2005 |