| Team AD Events Ltd | Arts & recreation | 2024 |
| Teamwatch Security Limited | Administrative & support | 2024 |
| Tech Gaint Limited | Information & communication | 2015 |
| Tech Gift Ltd | Wholesale & retail | 2025 |
| Tech Groud Limited | Wholesale & retail | 2025 |
| Tech Info Retail Limited | Wholesale & retail | 2026 |
| Tech Integrations Ltd | Extraterritorial | 2015 |
| Tech N Vape Ltd | Wholesale & retail | 2024 |
| Tech Vast Ltd | Wholesale & retail | 2026 |
| Techasia Online College Ltd | Education | 2024 |
| Technet Consultants Limited | Information & communication | 2020 |
| Techno Visions Events Ltd | Hospitality | 2023 |
| Technology Demands Ltd | Construction | 2024 |
| Technology Refurb UK Ltd | Wholesale & retail | 2021 |
| Technology UK First Ltd | Administrative & support | 2016 |
| Technology Wave Ltd | Wholesale & retail | 2025 |
| Technologyvs Limited | Wholesale & retail | 2013 |
| Techquad Limited | Wholesale & retail | 2025 |
| Tecnovara Ltd | Information & communication | 2026 |
| Tecsmart Resources Ltd | Administrative & support | 2013 |
| Tecto Tools Ltd | Wholesale & retail | 2017 |
| Tedred Ltd | Wholesale & retail | 2025 |
| Teejay Property Services Limited | Wholesale & retail | 2025 |
| Tegh Contractors Ltd | Construction | 2026 |
| Tejaji Traders Ltd | Wholesale & retail | 2025 |
| Tejbir Transport Ltd | Transport & logistics | 2024 |
| Tejinderpal Singh Ltd | Construction | 2024 |
| Tejj Ltd | Transport & logistics | 2018 |
| TEK Plus More Ltd | Wholesale & retail | 2023 |
| TEL Constructions Limited | Construction | 2013 |
| TEL Kitchens Limited | Manufacturing | 2017 |
| Tele Zone UK Ltd | Transport & logistics | 2015 |
| Telecoms Gateway Limited | Information & communication | 2004 |
| Telo AI Ltd | Information & communication | 2022 |
| Temmy Consultancy Limited | Health & social care | 2013 |
| Tempting Food Ltd | Wholesale & retail | 2010 |
| Tempur UK Limited | Wholesale & retail | 1992 |
| Tenacious Titans Limited | Wholesale & retail | 2024 |
| Tenroc Services Limited | Administrative & support | 2020 |
| Tera Dita Properties Ltd | Real estate | 2025 |
| Tera Shukrana Ltd | Professional & scientific | 2025 |
| Term Service Ltd | Construction | 2025 |
| Terminal 5 Mobile Accessories Ltd | Wholesale & retail | 2020 |
| Terra Mountain Group Ltd | Financial services | 2025 |
| Terraluxe Stone Ltd | Manufacturing | 2025 |
| Terrapaws Ltd | Wholesale & retail | 2025 |
| Terrashine Brar Services Ltd | Administrative & support | 2026 |
| Terrestrial 1 Ltd | Real estate | 2019 |
| Terrestrial 2 Ltd | Real estate | 2019 |
| Terrestrial 3 Ltd | Real estate | 2019 |
| Terrestrial 4 Ltd | Real estate | 2019 |
| Terrestrial 5 Ltd | Real estate | 2019 |
| Terrestrial 6 Ltd | Real estate | 2019 |
| Terrestrial 7 Ltd | Real estate | 2019 |
| Terrestrial 9 Ltd | Real estate | 2019 |
| Tersus Fit-Out Solutions Ltd | Construction | 2018 |
| Texla Brick Work Ltd | Construction | 2025 |
| Tfalls Limited | Health & social care | 2014 |
| Tfzaj Limited | Wholesale & retail | 2021 |
| TGH Autocentre Ltd | Wholesale & retail | 2022 |
| THA Clothing Ltd | Wholesale & retail | 2019 |
| Thames Chauffeur Services Ltd | Transport & logistics | 2026 |
| Thames HR Solutions Ltd | Professional & scientific | 2009 |
| Thames Kitchen and Bedrooms Ltd | Administrative & support | 2018 |
| Thameside Place (Freehold) Limited | Households | 2013 |
| Thank YOU for Love Ltd | Information & communication | 2026 |
| Thapa & Shrestha Property Ltd | Real estate | 2022 |
| Thapa & Sons Property Ltd | Real estate | 2022 |
| Thapa Property Ltd | Real estate | 2019 |
| Thapar Sons Limited | Wholesale & retail | 2011 |
| Thasvin Limited | Wholesale & retail | 2025 |
| Thatsmyproperty Ltd | Real estate | 2022 |
| Thayu Limited | Other services | 2019 |
| THE 014 Label Ltd | Wholesale & retail | 2026 |
| THE 1ST Eagle Ltd | Real estate | 2018 |
| THE AP Collection Limited | Wholesale & retail | 2022 |
| THE Arabs GR Ltd | Information & communication | 2014 |
| THE Auto Surgeon Ltd | Wholesale & retail | 2026 |
| THE Baggage Company Limited | Extraterritorial | 1987 |
| THE Beathard Project Ltd | Information & communication | 2024 |
| THE Best Guys Service London Ltd | Transport & logistics | 2026 |
| THE Birk-Sarili Group Ltd | Households | 2025 |
| THE Brothers Roofing & Building Ltd | Construction | 2025 |
| THE Bunny Chow Food Company Limited | Hospitality | 2005 |
| THE Cajun Crab Limited | Hospitality | 2018 |
| THE Car Paint Company Limited | Wholesale & retail | 1997 |
| THE Career Coaching Hub Limited | Education | 2024 |
| THE Carpenter Company (UK) Limited | Construction | 2016 |
| THE Chosen YOU Ltd | Wholesale & retail | 2022 |
| THE Clayco Collection Limited | Real estate | 2025 |
| THE Clean Atelier Limited | Administrative & support | 2026 |
| THE Coachmen Executive Limited | Transport & logistics | 2025 |
| THE Coding Company Middle East Limited | Administrative & support | 2019 |
| THE Coffee GEN Ltd. | Wholesale & retail | 2024 |
| THE Cognitive Behavioural Therapy Company Limited | Health & social care | 2017 |
| THE Company Cleaning Limited | Other services | 2018 |
| THE Continuity Company Limited | Wholesale & retail | 1991 |
| THE Corporate Practice Limited | Professional & scientific | 2003 |
| THE Crafty Bottle Limited | Wholesale & retail | 2023 |
| THE Crunchery Ltd | Hospitality | 2025 |