| THE Blended Beauty Group Ltd | Wholesale & retail | 2021 |
| THE Brimstone Group Ltd | Real estate | 2023 |
| THE Dharmi Store Ltd | Wholesale & retail | 2026 |
| THE FAB Masters UK Ltd | Wholesale & retail | 2016 |
| THE Finishing Club Ltd | Education | 2025 |
| THE Hub Community Healthcare Holdco Limited | Financial services | 2014 |
| THE Hub Community Healthcare Limited | Financial services | 2014 |
| THE Hub Community Healthcare Midco Limited | Financial services | 2015 |
| THE Hub Community Healthcare P Finance Limited | Financial services | 2010 |
| THE Hub Community Healthcare PH Limited | Financial services | 2010 |
| THE Hub Corporation Ltd | Wholesale & retail | 2021 |
| THE Hub Pharmacy Limited | Wholesale & retail | 2007 |
| THE Memorial Group Limited | Extraterritorial | 2000 |
| THE Nursing Lounge CIC | Hospitality | 2023 |
| THE Nutrition Parlour CIC | Hospitality | 2023 |
| THE Ockendon Academy | Education | 2010 |
| THE Old Ship Inn Aveley Ltd | Hospitality | 2020 |
| THE OTR Group Ltd | Information & communication | 2023 |
| THE Plant and Labour Co Ltd | Construction | 2023 |
| THE Secret Place Christian Cancer Support Ltd | Other services | 2020 |
| THE Tutorial System Ltd | Education | 2026 |
| THE Velvet Club Ltd | Wholesale & retail | 2026 |
| THE Virtù Clothing Limited | Wholesale & retail | 2020 |
| THE ZOË Living Ltd | Real estate | 2024 |
| Themind Limited | Information & communication | 2012 |
| Thenewleaf Ltd | Information & communication | 2021 |
| Theoiva Ltd | Real estate | 2025 |
| Theozeakus Limited | Construction | 2015 |
| Therapyonline Ltd | Health & social care | 2021 |
| Thesacx Ltd | Wholesale & retail | 2026 |
| Third Place Spaces CIC | Other services | 2025 |
| THP Calderdale Limited | Wholesale & retail | 2021 |
| THP Halifax Limited | Wholesale & retail | 2021 |
| THP Southowram Limited | Health & social care | 1948 |
| Threeas Consulting Ltd | Information & communication | 2023 |
| Thurrock Express Taxis Ltd | Transport & logistics | 2025 |
| Thurrock Fire and Security Ltd | Administrative & support | 2016 |
| Thurrock Recruitment Ltd | Transport & logistics | 2024 |
| Tidy Titans Ltd | Administrative & support | 2023 |
| Tigertie Ltd | Professional & scientific | 2020 |
| Tiham Investments Holding Ltd | Real estate | 2018 |
| TIN TIN Childcare Ltd | Health & social care | 2020 |
| TIN TIN Nursery Ltd | Health & social care | 2022 |
| Tinadew Limited | Professional & scientific | 2005 |
| Tinleton Transport Limited | Transport & logistics | 1975 |
| Tinu Ltd | Health & social care | 2019 |
| TIO Investments Limited | Real estate | 2021 |
| Tioluwa Estate Limited | Construction | 2024 |
| Titanium Resources and Management Limited | Administrative & support | 2024 |
| Titanstone Construction Ltd | Construction | 2025 |
| TKI Investments Ltd | Real estate | 2023 |
| Tltf Limited | Construction | 2019 |
| Tmbmg Group Limited | Agriculture & fishing | 2017 |
| TNG Sports Management Limited | Health & social care | 2014 |
| TNS Construction Ltd | Construction | 2020 |
| Toji Tech Services Ltd | Information & communication | 2026 |
| Token Holding Company Ltd | Arts & recreation | 2025 |
| Toksy Exclusive Fabrics Ltd | Wholesale & retail | 2025 |
| Tolandevefab Ltd | Wholesale & retail | 2021 |
| Tolmid International Ltd | Construction | 2018 |
| Tom’S Nails and Beauty Ltd | Other services | 2026 |
| Toniasunits Ltd | Wholesale & retail | 2026 |
| Tons & Son's Limited | Construction | 2015 |
| TOOL4U Ltd | Wholesale & retail | 2025 |
| Top Tyres RM15 Limited | Other services | 2019 |
| Topali C&M Limited | Construction | 2023 |
| Topnotch Security Limited | Administrative & support | 2025 |
| Topsy-Tee Ltd | Construction | 2019 |
| Total Beauty Ltd | Wholesale & retail | 2013 |
| Touch of Shine Automotive Ltd | Wholesale & retail | 2025 |
| TP Flooring Ltd | Construction | 2019 |
| TPC London Limited | Administrative & support | 2020 |
| TPD Trans Ltd | Transport & logistics | 2015 |
| Trade Dimensions Ltd | Wholesale & retail | 2016 |
| Tradeskilleduk Ltd | Construction | 2017 |
| Traditional Romanian Food Limited | Wholesale & retail | 2025 |
| Training Centre Raya London Ltd | Education | 2018 |
| Transcars Plus Ltd | Wholesale & retail | 2014 |
| Transit Doctor Ltd | Wholesale & retail | 2023 |
| Treasury Cash & Risk Services Ltd | Professional & scientific | 2024 |
| Trident Consultancy Ltd | Professional & scientific | 2022 |
| Trident NET Limited | Extraterritorial | 2002 |
| Trincos Ecommerce Limited | Wholesale & retail | 2026 |
| Trinityhill Healthcare Ltd | Health & social care | 2022 |
| Triple M Motors Limited | Wholesale & retail | 2021 |
| Triple T Childminding and IT Services Limited | Information & communication | 2020 |
| Triple T Foods Limited | Wholesale & retail | 2020 |
| TRL Trading Ltd | Wholesale & retail | 2020 |
| Trust Top Limited | Manufacturing | 2025 |
| Trydan Enterprises Limited | Real estate | 2022 |
| Tsbuildingworks Limited | Construction | 2022 |
| Tsenev Ltd | Transport & logistics | 2018 |
| Tsonika Ltd | Professional & scientific | 2014 |
| Tuhut Transport Ltd | Transport & logistics | 2016 |
| Tundhen Ltd | Construction | 2020 |
| Turning Space Into Place Ltd | Transport & logistics | 2024 |
| Tutors Corner Tuition UK Ltd | Education | 2024 |
| Uaslan Limited | Wholesale & retail | 2020 |
| Udimeg Limited | Health & social care | 2023 |
| UGUR2019 Limited | Hospitality | 2026 |