| Tmorre Ltd | Wholesale & retail | 2024 |
| TMS Systems Ltd | Transport & logistics | 1982 |
| Tmsr Ltd | Education | 2021 |
| TMT Homes Limited | Real estate | 2025 |
| TMW E-Talents Ltd | Professional & scientific | 2020 |
| TNM Fashion Ltd | Wholesale & retail | 2018 |
| TNM Sourcing Ltd | Administrative & support | 2026 |
| Tntyres 247 Ltd | Wholesale & retail | 2025 |
| Tobierre Ltd | Hospitality | 2022 |
| Tobli Builders Ltd | Construction | 2020 |
| Tobli Investments Ltd | Real estate | 2023 |
| TOD Couriers Limited | Transport & logistics | 2017 |
| Toffee Group Ltd | Construction | 2024 |
| Toga (Holdings) Limited | Financial services | 2001 |
| Toga (UK) Ltd | Administrative & support | 2011 |
| Toga Hire Centres Limited | Administrative & support | 2001 |
| Toga Limited | Administrative & support | 2001 |
| Toga Plant Hire Limited | Administrative & support | 1971 |
| Toguns Ltd | Information & communication | 2025 |
| Tohani Manufacturers Limited | Wholesale & retail | 1983 |
| TOI Ltd | Information & communication | 2009 |
| Toltem Ltd | Health & social care | 2019 |
| TOM & JUL Limited | Transport & logistics | 2017 |
| TOM Ashwood Real Estate Limited | Real estate | 2022 |
| Tombis Ltd | Wholesale & retail | 2015 |
| Tomoroga Trans Ltd | Transport & logistics | 2017 |
| Tomoya Ltd | Real estate | 2022 |
| Tompaulley Ltd | Professional & scientific | 2018 |
| Toni Builder Ltd | Construction | 2024 |
| Top Brother's Group Ltd | Construction | 2021 |
| Top Decor Plus Ltd | Construction | 2018 |
| Top Diamond Bar Restaurants Ltd | Administrative & support | 2017 |
| Top GUN Construction Limited | Construction | 2015 |
| Top GUN Properties Limited | Real estate | 2020 |
| Top Known Ltd | Wholesale & retail | 2017 |
| Top Marketting Ltd | Administrative & support | 2011 |
| Top of Top Trading Limited | Wholesale & retail | 2019 |
| Top Quality Drylining Limited | Construction | 2024 |
| Top Star Marketing (UK) Ltd | Wholesale & retail | 2010 |
| Top Star Online UK Limited | Wholesale & retail | 2022 |
| Top Tech Deal Ltd | Wholesale & retail | 2024 |
| Top Tree Estates Ltd | Real estate | 2024 |
| Top-Notch Professional Healthcare Limited | Health & social care | 2019 |
| Topbuild Support Ltd | Construction | 2024 |
| Topclass Digitech Solutions UK Limited | Information & communication | 2024 |
| Topline Estates Limited | Real estate | 2002 |
| Tops Grass Limited | Other services | 2020 |
| Toptech Enterprise Limited | Health & social care | 2018 |
| Topzero UK Limited | Wholesale & retail | 2026 |
| Torvixa Holdings Ltd | Wholesale & retail | 2025 |
| Total Accounting (UK) Ltd | Professional & scientific | 2013 |
| Total Car Repairs Ltd | Wholesale & retail | 2025 |
| Total Ease Group Ltd | Hospitality | 2025 |
| Total Waste Limited | Water & waste | 2025 |
| Toto Services Ltd | Wholesale & retail | 2018 |
| Tots N Tunes C.I.C. | Education | 2022 |
| Touchsky Trading Contracting & Transportation Limited | Water & waste | 2023 |
| Touchstone Property Ltd | Real estate | 2018 |
| Town Quay Accountants Ltd | Professional & scientific | 1994 |
| TPE London Ltd | Manufacturing | 2020 |
| Tpfl Regeneration Limited | Construction | 2011 |
| TR Crash Repairs Limited | Wholesale & retail | 2014 |
| Trackers Connect Limited | Information & communication | 2023 |
| Trade Faction Limited | Wholesale & retail | 2023 |
| Trade for Savings London Ltd | Construction | 2025 |
| Trade in Tech Ltd | Wholesale & retail | 2020 |
| Trade Way Limited | Construction | 2019 |
| TRADE4U Limited | Wholesale & retail | 2015 |
| Tradeavenue Limited | Wholesale & retail | 2006 |
| Tradeby Services UK Ltd | Information & communication | 2022 |
| Traders Group Holding Ltd | Professional & scientific | 2025 |
| Tradetrust FX Ltd | Information & communication | 2025 |
| Tradinaire Ltd | Financial services | 2021 |
| Trading World International Limited | Wholesale & retail | 2024 |
| Trafalgar Business Centre Management Company (NO.2) Limited | Households | 1992 |
| Transamerica Funding LP | | 1998 |
| Transant&Crl Ltd | Transport & logistics | 2019 |
| Transar Ltd | Extraterritorial | 2013 |
| Transferco Ltd | Administrative & support | 2021 |
| Transtores Ltd | Professional & scientific | 2006 |
| Travel Guide SA Limited | Administrative & support | 2024 |
| Travel Plus Limited | Administrative & support | 2012 |
| Travel Pro Ltd | Administrative & support | 2023 |
| Travelasyoulike Limited | Administrative & support | 2024 |
| Trays Properties Ltd | Real estate | 2023 |
| TRC Drylining Ltd | Construction | 2019 |
| TRD Ltd | Professional & scientific | 2019 |
| Treasurelife Ltd | Households | 2025 |
| Treatment of Surfaces Ltd | Manufacturing | 2016 |
| Tree Shadow Holdings UK Ltd | Real estate | 2024 |
| Treedent Ltd | Construction | 2021 |
| Trends Ideas Design Build Ltd. | Construction | 2020 |
| Trendux Ltd | Wholesale & retail | 2024 |
| Trendvibeluxury Ltd | Wholesale & retail | 2023 |
| Trendy Concepts Limited | Wholesale & retail | 2018 |
| Trendy Nest London Limited | Wholesale & retail | 2025 |
| Trendytek Ltd | Wholesale & retail | 2025 |
| Tresaanth Healthcare Limited | Health & social care | 2015 |
| Treseinove Ltd | Transport & logistics | 2019 |
| Tri-Star Enterprises Limited | Wholesale & retail | 2001 |