| T Ahamed Ltd | Real estate | 2020 |
| T Bakes London Ltd | Manufacturing | 2020 |
| T D Commercial Services Limited | Transport & logistics | 2004 |
| T Food Ltd | Transport & logistics | 2011 |
| T Gaur Limited | Transport & logistics | 2025 |
| T J Dhillon Property Ltd | Real estate | 2020 |
| T K London Ltd | Real estate | 2023 |
| T K Racing Ltd | Arts & recreation | 2019 |
| T K T Traders Ltd | Wholesale & retail | 2025 |
| T R Accountants Ltd | Professional & scientific | 2025 |
| T Singh Builder Limited | Construction | 2022 |
| T&G Highway Transport Service Ltd | Transport & logistics | 2012 |
| T&G House Ltd | Real estate | 2024 |
| T&K Aesthetics Limited | Other services | 2023 |
| T&Y Thai Cuisine Ltd | Hospitality | 2023 |
| T.C.U Transport Ltd | Transport & logistics | 2024 |
| T.Choithram & Sons(London)Limited | Wholesale & retail | 1960 |
| T3 Technology Solutions Limited | Information & communication | 2015 |
| T650 Investments Limited | Real estate | 2024 |
| Taaj Constructions Ltd | Construction | 2024 |
| Taaj Global UK Limited | Construction | 2020 |
| Taaj Marketing & PR Limited | Administrative & support | 2017 |
| Taaz Construction Ltd | Construction | 2026 |
| Tabaak Grill Master Ltd | Hospitality | 2025 |
| Tacknowledge Ltd | Education | 2025 |
| Tactical Logistics Ltd | Transport & logistics | 2018 |
| TAD Sargent Reupholstery Limited | Other services | 2022 |
| Tahira's Properties Ltd | Real estate | 2022 |
| Tahmid Consulting Ltd | Information & communication | 2024 |
| Tahss Properties Limited | Real estate | 2025 |
| Tail Tracking UK Limited | Wholesale & retail | 2019 |
| Taiwan Treasures Ltd | Wholesale & retail | 2024 |
| Taiwo ISW Limited | Health & social care | 2024 |
| TAJ Mahal Takeaway Limited | Hospitality | 2018 |
| TAJ Superstore Limited | Wholesale & retail | 2026 |
| Taja Ltd | Construction | 2021 |
| Tajin Carpets London Limited | Wholesale & retail | 2025 |
| Takeoffsorg Ltd | Wholesale & retail | 2025 |
| Takhter Ltd | Wholesale & retail | 2022 |
| Tala's Collectables Ltd | Wholesale & retail | 2025 |
| Talisman Chauffeur Cars Ltd | Transport & logistics | 2003 |
| Talkway Telecom Limited | Other services | 2014 |
| Talwar Food & Wine Ltd | Wholesale & retail | 2015 |
| Tamana Couture Ltd | Wholesale & retail | 2018 |
| Tamana Fashions Ltd | Wholesale & retail | 2011 |
| Tamanas Properties Ltd | Real estate | 2018 |
| Tamil Academic Journal Limited | Education | 2020 |
| Tamil Community Centre Hillingdon | Health & social care | 2011 |
| Tamior Ltd | Wholesale & retail | 2025 |
| Tango Facilities Management Limited | Administrative & support | 2024 |
| Tanpreet Ltd | Transport & logistics | 2026 |
| Tanu Enterprises Limited | Wholesale & retail | 2010 |
| Tanuaesthetics Limited | Other services | 2024 |
| Tanvir Transport Ltd | Transport & logistics | 2026 |
| Tanys Bakes Ltd | Manufacturing | 2023 |
| Tanzila & Tania Group Limited | Wholesale & retail | 2024 |
| TAP and Grow Online Ltd | Other services | 2024 |
| Tara Service Ukbd Ltd | Administrative & support | 2026 |
| Tareq Ahmadi Properties Ltd | Real estate | 2025 |
| Target Films Ltd | Wholesale & retail | 2023 |
| Tariq Halal Butchers Ltd | Manufacturing | 2015 |
| Tarsem Singh Ltd | Construction | 2025 |
| Tarvex Ltd | Administrative & support | 2018 |
| Tasha Hair & Beauty Salon Ltd | Other services | 2023 |
| Task Lighting Ltd | Wholesale & retail | 2019 |
| Tasker Close RTM Company Limited | Real estate | 2011 |
| Tasktag Global Limited | Information & communication | 2016 |
| Tasneem Falah Limited | Wholesale & retail | 2024 |
| Tast Investment Ltd | Real estate | 2026 |
| Taste of Injera Ltd | Manufacturing | 2026 |
| Taste of Jaffna Ltd | Hospitality | 2023 |
| Taste of Village Ltd | Extraterritorial | 2021 |
| Tastesprint Limited | Hospitality | 2025 |
| Tastysprint Limited | Hospitality | 2025 |
| Tasveeb Limited | Wholesale & retail | 2011 |
| Tattla Transport Ltd | Transport & logistics | 2026 |
| Tawakal Consultancy Limited | Professional & scientific | 2011 |
| Tax on Time Ltd | Professional & scientific | 2019 |
| Tax Refunds R US Ltd | Professional & scientific | 2019 |
| Taxcracker Ltd | Professional & scientific | 2023 |
| Taxformed Limited | Professional & scientific | 2020 |
| Taxi Light Ltd | Transport & logistics | 2018 |
| Taxwise Advisors Limited | Professional & scientific | 2025 |
| Tayetorque Ltd | Wholesale & retail | 2025 |
| TAZ Decorating Limited | Construction | 2025 |
| TAZ Roofing and Construction Ltd | Construction | 2022 |
| TB10 Electrical Ltd | Construction | 2025 |
| Tbhh Ltd | Hospitality | 2025 |
| Tbkv Ltd | Wholesale & retail | 2023 |
| Tbmn Ltd | Wholesale & retail | 2024 |
| TC Brothers Ltd | Wholesale & retail | 2021 |
| TC Creations Ltd | Wholesale & retail | 2026 |
| TC Scenery Limited | Information & communication | 2012 |
| TC2015 Limited | Administrative & support | 2004 |
| TCK Fresh Produce Limited | Manufacturing | 1997 |
| TCP Holdings Ltd | Financial services | 2023 |
| Tcpl Ltd | Financial services | 2021 |
| TD Furniture Limited | Manufacturing | 2012 |
| TD GBS Limited | Construction | 2024 |
| TEACHERS2UK Ltd | Administrative & support | 2025 |