| Tina Prajapat Limited | Other services | 2004 |
| Tiny Acorns Ltd | Arts & recreation | 2012 |
| Tiny Toez Tividale Limited | Education | 2023 |
| Tiptop IT Solutions Ltd | Extraterritorial | 2016 |
| Titan Hockey Limited | Wholesale & retail | 2020 |
| Titan Management Limited | Other services | 2007 |
| TJK Roofing Limited | Construction | 2024 |
| TJS Removals and Storage Ltd | Transport & logistics | 2018 |
| TJT Group Limited | Construction | 2019 |
| TM Sports Insights Ltd | Information & communication | 2026 |
| TM Supermart Ltd | Wholesale & retail | 2024 |
| TMP Windscreen Ltd | Wholesale & retail | 2023 |
| TN Roofing Servicing Limited | Construction | 2019 |
| Tnaa Limited | Real estate | 2025 |
| TNR Roofing Services Ltd | Construction | 2025 |
| TNS Bridgewood Ltd | Wholesale & retail | 2023 |
| TOM Garrad-Cole Music Limited | Information & communication | 2013 |
| TOM Grayley Electricals Ltd | Construction | 2017 |
| Toma Drylining Ltd | Construction | 2017 |
| Tony Workshop Limited | Wholesale & retail | 2023 |
| Toodoo Limited | Professional & scientific | 2007 |
| Toors R K Limited | Real estate | 2012 |
| Top Maintenance Services Ltd | Construction | 2018 |
| TOPMAN511 Repairs Limited | Wholesale & retail | 2025 |
| Topmind Trading Co., Ltd | Wholesale & retail | 2019 |
| Topp Drylining Ltd | Construction | 2019 |
| Toppay Ltd | Information & communication | 2024 |
| Torino Holdings Ltd | Real estate | 2020 |
| Torino Tech Limited | Wholesale & retail | 2005 |
| Tossingcoins Ltd | Real estate | 2016 |
| Total Construction, Design and Management Services Limited | Wholesale & retail | 2003 |
| Total Drain Services Ltd | Water & waste | 2025 |
| Total Therapy London Ltd | Health & social care | 2012 |
| Totalbuild (London) Ltd | Construction | 2007 |
| Totally Online Limited | Information & communication | 2011 |
| Totk Portfolio Ltd | Real estate | 2025 |
| Tottenham Wines Limited | Wholesale & retail | 2020 |
| Tourdust Chauffeurs Ltd | Transport & logistics | 2023 |
| Tower Mechanical Services Ltd | Construction | 2008 |
| Towers Business & Travel Services Co., Limited | Administrative & support | 2013 |
| TP Homes Cambridge Limited | Other services | 2022 |
| TPC & G Limited | Arts & recreation | 2003 |
| Trac Building Consultancy Ltd | Construction | 2023 |
| Track Back Media UK Ltd | Information & communication | 2023 |
| Trackboard Limited | Construction | 2020 |
| Traderx Ltd | Wholesale & retail | 2023 |
| Trading LW Ltd | Health & social care | 2026 |
| Tradingwise Limited | Manufacturing | 2005 |
| Traffic Data Centre Limited | Extraterritorial | 2006 |
| Traguest Limited | Administrative & support | 2020 |
| Trailer Creative Ltd | Professional & scientific | 2025 |
| Trams Care Ltd | Health & social care | 2010 |
| Trans Comm Production Ltd | Information & communication | 2018 |
| Transfly Powertrain Co., Limited | Wholesale & retail | 2023 |
| Transforce Ltd | Transport & logistics | 2020 |
| Transport Revenue Consultants Limited | Professional & scientific | 2008 |
| Travel FX Limited | Financial services | 2009 |
| Travelspiration Ltd | Administrative & support | 2023 |
| TRC Stores Ltd | Wholesale & retail | 2022 |
| Trekventure Ltd | Wholesale & retail | 2025 |
| Trendcom Ltd | Wholesale & retail | 2023 |
| Trendtrack Limited | Wholesale & retail | 2024 |
| Tresvant Ltd | Wholesale & retail | 2025 |
| Trevs Air-Conditioning Services Limited | Construction | 2008 |
| Tri-Continental Limited | Information & communication | 1987 |
| Triangle Property Management Ltd | Real estate | 2018 |
| Triangle Security Ltd | Other services | 1997 |
| Tricon Academy Ltd | Education | 2016 |
| Trident Logistics Ltd | Transport & logistics | 2024 |
| Trinetra Private Limited | Wholesale & retail | 2024 |
| Trinity Drives & Patios Limited | Construction | 2022 |
| Trinx Ville Technologies Limited | Information & communication | 2022 |
| Triple M Roofing Limited | Construction | 2017 |
| Triple Seven Worldwide Limited | Transport & logistics | 2014 |
| Tripnest Ltd | Wholesale & retail | 2025 |
| Tripoint 2 Ltd | Real estate | 2025 |
| Tripoint Properties Ltd | Construction | 2024 |
| Triton Building Conservation Ltd | Construction | 2008 |
| Triumph OIL & Petroleum Corporation UK Ltd | Other services | 2020 |
| Trivio Accountants Limited | Professional & scientific | 2026 |
| Tropicalia Show Band Ltd | Arts & recreation | 2010 |
| Trove Store Limited | Wholesale & retail | 2020 |
| True Health House Ltd | Wholesale & retail | 2023 |
| Truemove One Properties Limited | Real estate | 2019 |
| Truesun Ltd | Financial services | 2020 |
| Trunkrate Properties Limited | Extraterritorial | 1994 |
| Truthseer Psychic and Mediumship Services Ltd | Arts & recreation | 2020 |
| Trybass Limited | Wholesale & retail | 2014 |
| TS4TRAINING Ltd | Professional & scientific | 2013 |
| Tseri Properties Ltd | Real estate | 2008 |
| Tsmaxx Ltd | Wholesale & retail | 2026 |
| Ttny Investments Ltd | Real estate | 2015 |
| Tubman Breaks Ltd | Administrative & support | 2024 |
| Tudan Trans Ltd | Transport & logistics | 2023 |
| Tulka Ltd | Hospitality | 2012 |
| Tullys Domestic Appliances Ltd | Extraterritorial | 2025 |
| Tunmet Limited | Hospitality | 2016 |
| Tutoring Solutions Ltd | Information & communication | 2020 |
| TV Ignite Limited | Wholesale & retail | 2012 |
| Twelfth Capital Limited | Real estate | 2023 |