| Touch of Elegance Ltd | Manufacturing | 2024 |
| Touchedtheatre CIC | Education | 2011 |
| Tower Lottery Partnership Limited | Arts & recreation | 2014 |
| Tower Oak Limited | Real estate | 2019 |
| Tower Rental Properties Ltd | Real estate | 2022 |
| Tower Solutions Direct Limited | Administrative & support | 2001 |
| Tower View Properties Ltd | Real estate | 2021 |
| Towers Whitehead Wealth Management Limited | Financial services | 2020 |
| Towey Properties Limited | Hospitality | 2019 |
| Townside Management Company (NO 1) Limited | Construction | 2007 |
| Towrey Construction Limited | Wholesale & retail | 1994 |
| Toy HUT Ltd | Wholesale & retail | 2022 |
| TP Tree Care Ltd | Administrative & support | 2023 |
| TPC MCR Holding Ltd | Real estate | 2025 |
| TRA Leasing Ltd | Administrative & support | 2021 |
| Trac Associates Limited | Professional & scientific | 2011 |
| Trac Laboratories Limited | Professional & scientific | 2017 |
| Tracelinea Publishing Ltd | Information & communication | 2025 |
| Track Fast Logistics Ltd | Transport & logistics | 2025 |
| Trackify Ltd | Administrative & support | 2024 |
| Tradcat Limited | Information & communication | 2018 |
| Tradeedge Ltd | Wholesale & retail | 2025 |
| Traditional FUN Fair Ride Hire Ltd | Arts & recreation | 2023 |
| Trafalgar House Income Limited Partnership | | 2010 |
| Transformative CX Limited | Professional & scientific | 2025 |
| Transition Cycle Coaching Ltd | Arts & recreation | 2015 |
| Transition Mountain Bike Coaching Limited | Arts & recreation | 2020 |
| Transmaster Limited | Information & communication | 2024 |
| Transport Contracting Services Limited | Professional & scientific | 2015 |
| Transswift Freight Services Limited | Transport & logistics | 2002 |
| Trapgiddy | Wholesale & retail | 2018 |
| Trapped in Limited | Arts & recreation | 2015 |
| Travel 1ST Group Limited | Administrative & support | 2020 |
| Travel 1ST Sports & Events Ltd | Administrative & support | 2025 |
| Travel by Knight Ltd | Administrative & support | 2024 |
| Travel Partner Services Ltd | Other services | 2024 |
| Travel Tax Return Limited | Administrative & support | 2025 |
| TRAVELDEALS4LESS Limited | Other services | 2006 |
| Traveltweet Ltd | Administrative & support | 2011 |
| Tree 2 My Door Limited | Wholesale & retail | 2003 |
| Trendy Spot UK Ltd | Wholesale & retail | 2017 |
| Trendy Treasures Store Ltd | Wholesale & retail | 2024 |
| Trendyhomemart Ltd | Wholesale & retail | 2025 |
| Trennedden Developments Limited | Construction | 2007 |
| Trevalyn Manor Management Co. Ltd | Households | 2010 |
| Trewan Sands Children's Trust | Professional & scientific | 2008 |
| TRI Star Developments (Kearsley) Ltd | Construction | 2023 |
| Tricom Trading Ltd | Extraterritorial | 2025 |
| Tricycle Consultants Ltd | Real estate | 2022 |
| Trident Electronics (U.K.) Ltd | Construction | 2009 |
| Trident Electronics Distribution Ltd | Administrative & support | 2016 |
| Trident Installation Services Ltd | Construction | 2025 |
| Trident Security Distribution Ltd | Administrative & support | 2020 |
| Trinite Developments Ltd | Construction | 2019 |
| Trinity Hvac Limited | Construction | 2025 |
| Trip Outfit Limited | Wholesale & retail | 2025 |
| Tripinfluencer Ltd | Professional & scientific | 2025 |
| Triple B Distribution Limited | Administrative & support | 2024 |
| Triumphus Group Ltd | Construction | 2020 |
| TRK Civils Ltd | Construction | 2023 |
| Trojan Locks and Windows Ltd | Manufacturing | 2012 |
| TRU Trade Limited | Wholesale & retail | 2023 |
| True Barber Solutions Limited | Professional & scientific | 2026 |
| True CFP Limited | Financial services | 2006 |
| True Claim Limited | Professional & scientific | 2002 |
| True Form Driveways Ltd | Construction | 2025 |
| Truenorth Transport Ltd | Transport & logistics | 2025 |
| Trumeter Group Limited | Professional & scientific | 2014 |
| Trumeter Technologies Limited | Manufacturing | 2010 |
| Trunk Wise Limited | Transport & logistics | 2015 |
| Truslit Limited | Manufacturing | 2019 |
| Trusted Governor Services Limited | Education | 2018 |
| Trustpal Limited | Wholesale & retail | 2010 |
| Trynex Limited | Wholesale & retail | 2026 |
| TS Garage Bury Ltd | Wholesale & retail | 2026 |
| TSA Educational Consultancy Ltd | Professional & scientific | 2025 |
| Tsar Enterprises Ltd | Wholesale & retail | 2025 |
| TSI Health Sciences (Europe) Limited | Wholesale & retail | 2005 |
| TSR Valstone Limited | Professional & scientific | 2018 |
| TTM Catering Ltd | Hospitality | 2024 |
| TTY Ltd | Wholesale & retail | 2026 |
| TUN Fusion Ltd | Hospitality | 2020 |
| TUN Home Investment Ltd | Real estate | 2025 |
| Tunstead Needlefelt Company Limited | Professional & scientific | 1935 |
| Tura Construction Limited | Extraterritorial | 2021 |
| Turbot HQ Limited | Information & communication | 2016 |
| Turkish Gozleme Ltd | Hospitality | 2019 |
| Turnbull Prints Ltd | Manufacturing | 2010 |
| Turner & Coates Limited | Professional & scientific | 2005 |
| Turner Property Recruitment Limited | Administrative & support | 2019 |
| Turner Smith Scaffolding Ltd | Construction | 2021 |
| Turnpike Garage Engineering Limited | Wholesale & retail | 2026 |
| Turquoiz Limited | Professional & scientific | 2016 |
| TW Nutrition Limited | Education | 2025 |
| Twenty 10 Limited | Construction | 2009 |
| Two Crows Arts Studio CIC | Arts & recreation | 2024 |
| Two Roses Investments Limited | Real estate | 2023 |
| Tyco Roofing Ltd | Construction | 2017 |
| Tyde Ltd | Professional & scientific | 2023 |
| Tyre Base Ltd | Wholesale & retail | 2026 |