| Tazuri Ltd | Manufacturing | 2025 |
| TB Goodge Street Limited | Hospitality | 2021 |
| TB Hounslow Ltd | Hospitality | 2019 |
| TB Real Estate Limited | Real estate | 2025 |
| TBF Design & Services Limited | Professional & scientific | 2022 |
| TBI Design Limited | Construction | 2017 |
| Tbit Investments Limited | Real estate | 2016 |
| TC Building and Cleaning Ltd | Construction | 2024 |
| TC Childcare Limited | Health & social care | 2026 |
| TCG Supply Limited | Wholesale & retail | 2026 |
| TD Import & Export Limited | Wholesale & retail | 2022 |
| TDC Management Limited | Real estate | 2012 |
| Tea House Theatre Limited | Arts & recreation | 2008 |
| Teacher Eddie Limited | Education | 2025 |
| Teacracy Limited | Wholesale & retail | 2017 |
| Team JET Training Ltd | Wholesale & retail | 2024 |
| Team Source Ltd | Extraterritorial | 2018 |
| Team Supplies Limited | Wholesale & retail | 2007 |
| Teawishes Ltd | Hospitality | 2018 |
| Tech ENOV8 Limited | Information & communication | 2020 |
| Tech Everyday Ltd | Information & communication | 2025 |
| Tech Forge Global Ltd | Information & communication | 2023 |
| Tech Mobile & Laptop Solutions Ltd | Wholesale & retail | 2024 |
| Tech Radiant Limited | Administrative & support | 2011 |
| Tech Xpress Parts Ltd | Wholesale & retail | 2025 |
| Tech-Ten Enterprises Ltd | Information & communication | 2019 |
| TECHARCH2OPS Ltd | Information & communication | 2025 |
| Techboulders UK Ltd | Information & communication | 2026 |
| Techcyle Ltd | Information & communication | 2026 |
| Techlogix Zone Ltd | Wholesale & retail | 2016 |
| Techno Thermal Limited | Professional & scientific | 2024 |
| Technohub Ltd | Wholesale & retail | 2018 |
| Technovax Group Ltd | Manufacturing | 2026 |
| Techoiceuk Ltd | Wholesale & retail | 2022 |
| Techrock Limited | Information & communication | 2024 |
| Techuoso Ltd | Information & communication | 2024 |
| Teclabs Software Limited | Information & communication | 2020 |
| Tecnicasolutions Limited | Information & communication | 2013 |
| Tecnomaxx Digital Ltd | Information & communication | 2024 |
| Tecport Ltd | Wholesale & retail | 2021 |
| Teddies Nursery Ltd | Education | 2009 |
| Tedi Carpenter Ltd | Manufacturing | 2025 |
| Teilo Properties Limited | Real estate | 1994 |
| TEJ Chauhan Limited | Professional & scientific | 2005 |
| Teki Ltd | Hospitality | 2025 |
| Tekmass Group Ltd | Real estate | 2023 |
| Teksaas Ltd | Information & communication | 2023 |
| Tekskills UK PVT Limited | Information & communication | 2014 |
| Tele-Chem Limited | Wholesale & retail | 2002 |
| Tele-Chem Property Limited | Real estate | 2024 |
| Teleioo Consult Limited | Administrative & support | 2025 |
| Teli Consultancy Limited | Information & communication | 2024 |
| Tell IT Productions Ltd | Arts & recreation | 2022 |
| Telstar Analytics Limited | Financial services | 2018 |
| Temple Heath Lodge Management Limited | Households | 1992 |
| Temple Trees Ltd | Wholesale & retail | 2020 |
| Templewood Equity Ltd | Financial services | 2022 |
| TEN P.M. Ltd | Information & communication | 2017 |
| Tenda Consulting Ltd | Professional & scientific | 2018 |
| Tenej Global Resources Ltd | Professional & scientific | 2026 |
| Tenjin Housing Ltd | Real estate | 2018 |
| Tensity Global Partners Ltd | Information & communication | 2026 |
| Tensory Ltd | Professional & scientific | 2025 |
| TEO Ents Limited | Arts & recreation | 2026 |
| TEO GAL Ltd | Construction | 2021 |
| Teproms Limited | Professional & scientific | 2012 |
| Terence Knight Design Services Limited | | 1964 |
| Terezajicha Media Ltd. | Professional & scientific | 2014 |
| Tesa Surveying Limited | Professional & scientific | 2024 |
| Tesfai Yerga and Lulia Ltd | Real estate | 2021 |
| TF Holloway Road Ltd | Wholesale & retail | 2022 |
| TFC Edgware Supermarket Ltd | Wholesale & retail | 2019 |
| TFK Properties Ltd | Real estate | 2021 |
| TG Plumbing and Heating Ltd | Construction | 2018 |
| TG Roofing Services Ltd | Construction | 2021 |
| TGN Hotels Ltd | Real estate | 2022 |
| TH UK Properties Ltd | Wholesale & retail | 2023 |
| Thai Kitchen and Bar Limited | Hospitality | 2019 |
| Thai Management Limited | Administrative & support | 2018 |
| Thakkar and Co. Ltd | Professional & scientific | 2026 |
| Thakrar (Norfolk) Ltd | Health & social care | 2019 |
| Thames Luxury Flooring Ltd | Construction | 2026 |
| Thames Retail Limited | Wholesale & retail | 2025 |
| Thames Teachers Limited | Professional & scientific | 2009 |
| Thapar Investments Ltd | Financial services | 2014 |
| Thatchpride Estates Limited | Other services | 1988 |
| THE 10 Club Limited | Hospitality | 2022 |
| THE ADS Gallery Ltd | Professional & scientific | 2022 |
| THE Aesthetics Atelier Limited | Health & social care | 2023 |
| THE Agency (Real Estate) Limited | Real estate | 2006 |
| THE AL Xperience Limited | Information & communication | 2025 |
| THE Angels Homes London Limited | Health & social care | 2021 |
| THE Annunciation and ST James of the Apostles | Other services | 2013 |
| THE Artist Barbers Ltd | Other services | 2024 |
| THE Athena Capital Limited | Financial services | 2006 |
| THE Auto Technicians Ltd | Wholesale & retail | 2026 |
| THE Avaia Group Ltd | Information & communication | 2026 |
| THE Balcony View Consultancy Limited | Professional & scientific | 2023 |
| THE Beaconsfield Workshop Limited | Wholesale & retail | 2015 |
| THE BED BUG Queen Limited | Administrative & support | 2025 |