| Taplow Group Limited | Construction | 2022 |
| Target Locksmiths Limited | Other services | 2009 |
| Targo Ltd | Wholesale & retail | 2021 |
| Taste and Trucks Group Ltd | Hospitality | 2025 |
| Taste for Glory Ltd | Hospitality | 2024 |
| Taste of Afghanistan Ltd | Hospitality | 2018 |
| Taste of Truro Limited | Hospitality | 2017 |
| Taste Transit Limited | Wholesale & retail | 2023 |
| Tasty Kebab House Ltd | Hospitality | 2020 |
| Tasya Foods Limited | Wholesale & retail | 2025 |
| Tata Consumer Products Capital Limited | Financial services | 2006 |
| Tata Consumer Products GB Limited | Wholesale & retail | 1995 |
| Tata Consumer Products Overseas Holdings Limited | Financial services | 1995 |
| Tata Consumer Products UK Group Limited | Financial services | 1999 |
| Tata Global Beverages Holdings Limited | Extraterritorial | 1996 |
| Tata Global Beverages Investments Limited | Extraterritorial | 2006 |
| Tata Global Beverages Overseas Limited | Extraterritorial | 1996 |
| Tata Global Beverages Services Limited | Extraterritorial | 1995 |
| Tatarim Limited | Construction | 2017 |
| Tati Company Limited | Real estate | 1914 |
| Tattla Greenford Property 1 Ltd | Real estate | 2025 |
| Tattla Wholesale Ltd | Wholesale & retail | 2023 |
| Taur Group Services Ltd | Administrative & support | 2019 |
| Tax and Accounting Ltd | Professional & scientific | 2017 |
| Taxation US Ltd | Other services | 2014 |
| Taxbook Accountancy Ltd | Professional & scientific | 2017 |
| Taxhub Limited | Transport & logistics | 2020 |
| Tazaw Ltd | Wholesale & retail | 2020 |
| Tech Bans Ltd | Information & communication | 2021 |
| Tech Supply 23 Ltd | Wholesale & retail | 2025 |
| Tech Ventures Europe Ltd | Information & communication | 2025 |
| Tech Venue Limited | Information & communication | 2019 |
| Tech-Bench Ltd | Wholesale & retail | 2013 |
| TECH0 Solutions Ltd | Information & communication | 2025 |
| Techbee Digital Ltd | Information & communication | 2023 |
| Techbelieve Ltd | Information & communication | 2023 |
| Techjoy Hub UK Limited | Information & communication | 2026 |
| Technical Affairs Limited | Real estate | 1976 |
| Technically Speaking Ltd | Information & communication | 2020 |
| Technique Accounting Limited | Professional & scientific | 2011 |
| Techport Investements Limited | Real estate | 2019 |
| Techround Technologies Ltd | Information & communication | 2022 |
| Techsist Limited | Construction | 2020 |
| Techton SS Ltd | Construction | 2024 |
| TED Cables Ltd | Wholesale & retail | 2024 |
| Tekgenie Ltd | Information & communication | 2022 |
| Teko Construction Ltd | Construction | 2020 |
| Teleoaca Construction Ltd | Construction | 2024 |
| Temduris Limited | Construction | 2025 |
| Temple Green Estates Ltd | Real estate | 2021 |
| Temporal Films Limited | Information & communication | 2000 |
| Tenamis Enterprise Ltd | Education | 2024 |
| Tennis Icon UK Limited | Arts & recreation | 2015 |
| Terrythompson Ltd | Information & communication | 2014 |
| Tesla Renovations Ltd | Construction | 2007 |
| Tezamare Properties (UK) Limited | Real estate | 2024 |
| Thames Cars Limited | Wholesale & retail | 2017 |
| Thames Ditton Retail Limited | Wholesale & retail | 2012 |
| Thames Legal Bureau Ltd | Professional & scientific | 2025 |
| Thanawala Management Limited | Hospitality | 2024 |
| That Entertainment Company Limited | Arts & recreation | 2018 |
| THB Property Services Limited | Real estate | 2024 |
| THE Activities Group Ltd | Arts & recreation | 2022 |
| THE Alignment Centre Limited | Manufacturing | 2002 |
| THE Analytic Practice (NO. 1) Limited | Extraterritorial | 2012 |
| THE Art of Carpentry Ltd | Construction | 2025 |
| THE Art of Chun Box Ltd | Other services | 2026 |
| THE BAE Network Limited | Hospitality | 2022 |
| THE Big Packaging Company Ltd | Administrative & support | 2017 |
| THE Boxiva Store Ltd | Wholesale & retail | 2025 |
| THE Bridging & Development Lenders Association Limited | Administrative & support | 2008 |
| THE British Sikh Association Ltd | Health & social care | 2023 |
| THE Chauffeurs Club Ltd | Transport & logistics | 2022 |
| THE Close Estate Management Company | Households | 2025 |
| THE Coach Carla Consultancy Limited | Administrative & support | 2023 |
| THE Confident Woman UK Ltd | Other services | 2025 |
| THE Consistency Blueprint Limited | Health & social care | 2026 |
| THE Corporate Ltd | Information & communication | 2020 |
| THE Curry Parade Ltd | Hospitality | 2019 |
| THE Decantable Group Limited | Financial services | 2025 |
| THE Designer Studio by Zoey Barker Limited | Information & communication | 2020 |
| THE Druze Hope Foundation Ltd | Health & social care | 2025 |
| THE Dune Music Company Limited | Arts & recreation | 1996 |
| THE Entheos Consultancy Ltd. | Other services | 1993 |
| THE Essentials Enterprise Limited | Wholesale & retail | 2026 |
| THE Fame Partnership Ltd | Professional & scientific | 2017 |
| THE Fruitful Design Consultancy Limited | Professional & scientific | 2009 |
| THE General Oceanic Thermal Energy Corporation Limited | Professional & scientific | 2012 |
| THE Girl WHO Wished a Change Ltd | Information & communication | 2023 |
| THE Glazing Supply Ltd | Construction | 2022 |
| THE Golden Thistle Ltd | Hospitality | 2025 |
| THE Good GOL UK Ltd | Wholesale & retail | 2025 |
| THE Granite GUY Limited | Manufacturing | 2014 |
| THE Group Analytic Practice Limited | Real estate | 2012 |
| THE Hanwell Pottery Partnership LLP | | 2024 |
| THE Havn Group Greenford Ltd | Real estate | 2025 |
| THE Heath Inn Limited | Hospitality | 2023 |
| THE Hfactor HR Ltd | Administrative & support | 2025 |
| THE Honey Factory Limited | Real estate | 2015 |
| THE House of Couturier Ltd | Wholesale & retail | 2020 |