| TEO Stone Ltd | Manufacturing | 2011 |
| Teoeduard Transport Limited | Construction | 2024 |
| Teonfa Limited | Health & social care | 2009 |
| Teonfa Living Ltd | Real estate | 2025 |
| Teora Solutions Ltd | Construction | 2023 |
| Teraart Limited | Construction | 2017 |
| Teratradersglobal Limited | Wholesale & retail | 2021 |
| Teresa Green Tarot Ltd | Arts & recreation | 2025 |
| Terex Logistics Ltd | Transport & logistics | 2025 |
| Termhouse (25/33 Northgates) Management Limited | Households | 1977 |
| Terminal Cleaning Services Ltd | Administrative & support | 2021 |
| Terra Landscapes Construction Limited | Construction | 2023 |
| Terrachain Limited | Information & communication | 2025 |
| Terracx Limited | Wholesale & retail | 2024 |
| Terrafast Limited | Professional & scientific | 2021 |
| Terranexus Ltd | Transport & logistics | 2025 |
| Terravision Electric Limited | Manufacturing | 2021 |
| Terravision London Finance Ltd | Transport & logistics | 2009 |
| Terravision Real Estate Limited | Real estate | 2005 |
| Terravision Transport Limited | Transport & logistics | 2003 |
| Tesa Construction Limited | Construction | 2025 |
| Tesono Holdings Ltd | Real estate | 2020 |
| Tesoro Principesco Limited | Wholesale & retail | 2025 |
| Test LT Solutions Ltd | Professional & scientific | 2022 |
| Testar Ltd | Construction | 2019 |
| Testclub Ltd | Information & communication | 2016 |
| Testifi Ltd | Administrative & support | 2025 |
| Testr Republic Ltd | Information & communication | 2020 |
| Testwall Group Ltd | Wholesale & retail | 2024 |
| Testwall UK Limited | Manufacturing | 2015 |
| TET Stoica Ltd | Construction | 2025 |
| Texclusive Ltd | Wholesale & retail | 2025 |
| Teya Education & Advisory Limited | Information & communication | 2026 |
| Tezz UK Ltd | Manufacturing | 2021 |
| TFA Consulting Ltd | Information & communication | 2026 |
| Tfin Logistics Ltd | Hospitality | 2021 |
| TG Fire Consultants Limited | Public administration | 2020 |
| TG-1 Limited | Professional & scientific | 2016 |
| TGB Pro Ltd | Other services | 2015 |
| Tgexpress Limited | Transport & logistics | 2008 |
| Tgfc Car Hire Limited | Administrative & support | 2021 |
| Tgkl Ltd | Financial services | 2025 |
| TH UK Services Limited | Transport & logistics | 2021 |
| Th&Ma Co Limited | Wholesale & retail | 2025 |
| TH3 Glow Room Ltd | Administrative & support | 2025 |
| Thai Andaman Ltd | Hospitality | 2025 |
| Thai Chilli Limited | Hospitality | 2018 |
| Thai Spicy Ltd | Hospitality | 2024 |
| Thai Zapp Ltd | Hospitality | 2024 |
| Thakur Everliving Limited | Real estate | 2017 |
| Thakyala Ltd | Health & social care | 2022 |
| Thames Cleaning Solutions Limited | Other services | 2015 |
| Thames International Traders Ltd | Wholesale & retail | 2020 |
| Thames Valley London Ltd | Transport & logistics | 2023 |
| Thamesbridge Limited | Information & communication | 2018 |
| Thanis Builders Ltd | Construction | 2024 |
| Thastonqotha Limited | Health & social care | 2011 |
| Thawab Clothing Ltd | Wholesale & retail | 2024 |
| THD Luton Ltd | Administrative & support | 2023 |
| THE 153 Ltd | Arts & recreation | 2025 |
| THE 27 Spices Limited | Hospitality | 2022 |
| THE 360 Booth Ltd | Arts & recreation | 2026 |
| THE 9’S Marketing Ltd | Other services | 2025 |
| THE Academy of Pastoral Leadership Ltd | Professional & scientific | 2021 |
| THE Ace Effect Ltd. | Information & communication | 2019 |
| THE Action Room Ltd | Arts & recreation | 2024 |
| THE African Descent International Diaspora | Other services | 2012 |
| THE Akhtar Clinic Ltd | Health & social care | 2025 |
| THE Ameina Centre CIC | Hospitality | 2012 |
| THE Antiques Dealers Fair Limited | Administrative & support | 2001 |
| THE Art Source Decor Limited | Wholesale & retail | 2022 |
| THE Art Therapy Lodge Limited | Health & social care | 2024 |
| THE Asset Guru Limited | Other services | 2017 |
| THE Asset People Limited | Wholesale & retail | 2016 |
| THE Avenue Group Luton Ltd | Other services | 2022 |
| THE Awareness T.A.P (Through Arts Programme) Limited | Information & communication | 2017 |
| THE Bagpiper Master Ltd | Hospitality | 2023 |
| THE Bailie Luton Limited | Hospitality | 2023 |
| THE Ballet Studio Limited | Wholesale & retail | 2024 |
| THE Barn BBQ Ltd | Hospitality | 2026 |
| THE Barn Tea Green Ltd | Real estate | 2021 |
| THE Bathroom Company Ltd | Wholesale & retail | 2025 |
| THE Bear Club Limited | Hospitality | 2022 |
| THE Beauty Club Ltd | Other services | 2020 |
| THE Berkley Square ROW PCM Services Management Ltd | Other services | 2024 |
| THE Bible Tabernacle Ministries Limited | Other services | 2025 |
| THE Big DIG Ltd | Construction | 2026 |
| THE Bindi Binder Ltd | Wholesale & retail | 2021 |
| THE Black Loft Photography Ltd | Health & social care | 2014 |
| THE Bmic Collective Limited | Other services | 2026 |
| THE Bold Luxe Limited | Wholesale & retail | 2025 |
| THE Bookworm and Oddities Ltd | Wholesale & retail | 2026 |
| THE Bright Star PUB Company Limited | Hospitality | 2019 |
| THE Building Wizards Ltd | Construction | 2014 |
| THE Burford Centre CIC | Arts & recreation | 2012 |
| THE Burger Yard Group Ltd | Hospitality | 2025 |
| THE BV Group UK Limited | Construction | 2018 |
| THE Cake Family Limited | Hospitality | 2016 |
| THE Calm Table Ltd | Professional & scientific | 2026 |
| THE Candyboss Club Ltd | Professional & scientific | 2009 |