| Tiger Consulting Ltd | Professional & scientific | 2025 |
| Tigerbutterfly Limited | Extraterritorial | 2016 |
| Tigers Reign Limited | Other services | 2024 |
| Tihomir Hadzhiev Ltd | Other services | 2021 |
| TIK Trading Limited | Wholesale & retail | 2021 |
| Tili Solutions Limited | Professional & scientific | 2016 |
| Tilsley Groundworks Limited | Construction | 2008 |
| TIM Gilbert Services Limited | Transport & logistics | 2011 |
| TIM Wilson Bespoke Kitchens Limited | Administrative & support | 2010 |
| Time for M.E Aesthetics Ltd | Other services | 2025 |
| Time Logistics Ltd | Transport & logistics | 2014 |
| Tinderbox Business Development Ltd | Professional & scientific | 2024 |
| Tinman Fabrications Limited | Manufacturing | 2020 |
| Tinman Steels Limited | Manufacturing | 2012 |
| Tiny Tamworth Play Cafe Ltd | Hospitality | 2026 |
| Tipstrr Ltd | Information & communication | 2014 |
| Titan World Ltd | Information & communication | 2016 |
| TJ Accounting Services Limited | Professional & scientific | 2016 |
| TJ Fleet Services Ltd | Professional & scientific | 2026 |
| Tj's PUB Kitchen Ltd | Hospitality | 2025 |
| TJB Air Conditioning Services Limited | Financial services | 2019 |
| Tjford Driving Ltd | Transport & logistics | 2026 |
| TJM Maintenance Services Ltd | Administrative & support | 2021 |
| TLM Holdings Limited | Education | 2018 |
| TMF Dordon Ltd | Manufacturing | 2009 |
| TMG Capital Ltd | Information & communication | 2019 |
| TMH Enterprises Ltd | Extraterritorial | 2023 |
| Tmware Ltd | Information & communication | 1984 |
| TMX Warehousing & Distribution Limited | Extraterritorial | 1984 |
| Toby Analytics Ltd | Information & communication | 2023 |
| Tocc Properties Ltd | Real estate | 2018 |
| Toda Drylining & Ceilings Limited | Administrative & support | 2006 |
| Togass Ltd | Transport & logistics | 2022 |
| TOM Billington Chiropractic Ltd | Health & social care | 2017 |
| Tom's Plant Hire Limited | Administrative & support | 2024 |
| Toma Consultancy Ltd | Transport & logistics | 2025 |
| Tompave Ltd | Construction | 2018 |
| Tomson Trading & Distribution LLP | | 2023 |
| Tomson Trading & Distribution UK Limited | Wholesale & retail | 2023 |
| Tony Mcelligott Holdings Ltd | Financial services | 2025 |
| TOO Trans Ltd | Transport & logistics | 2021 |
| Tool Box (Nuneaton) Ltd | Wholesale & retail | 2011 |
| Top 2 Toes Limited | Wholesale & retail | 2003 |
| Top Driver Limited | Transport & logistics | 2025 |
| Top Level Screed Ltd | Construction | 2019 |
| Top Notch Motor Group Limited | Wholesale & retail | 2026 |
| Topaz Panel Management Limited | Financial services | 2022 |
| Topbuild Developments Ltd | Construction | 2021 |
| Topbuild Properties Ltd | Real estate | 2022 |
| Topcon Positioning (Great Britain) Limited | Wholesale & retail | 2018 |
| Toppers Beauty Salon Limited | Other services | 2025 |
| Toppers Hair Boutique Limited | Other services | 2023 |
| Toro Loco Ltd | Administrative & support | 2012 |
| Torque Services Limited | Administrative & support | 2007 |
| Torridge Hockley 1972 Limited | Extraterritorial | 2014 |
| Tort Property LLP | | 2013 |
| TOS Operations Limited | Financial services | 2023 |
| Total Automation Solutions Limited | Professional & scientific | 2008 |
| Total Branded Ltd | Administrative & support | 2026 |
| Total Facilities in Management UK Ltd | Other services | 2021 |
| Total Gritting Solutions Ltd | Hospitality | 2020 |
| Total Groundcare Services Limited | Administrative & support | 2022 |
| Total Process Cooling Limited | Professional & scientific | 1991 |
| Total Property Management Ltd | Real estate | 2017 |
| Total Recall Business Services Limited | Administrative & support | 2013 |
| Touchstone Property Services Limited | Construction | 2022 |
| Tower Composites Limited | Manufacturing | 2018 |
| TPC Limited | Administrative & support | 2005 |
| TPS 360 (Central, North & East) Ltd | Construction | 2025 |
| TPW Electrical Services Limited | Construction | 2021 |
| Tracy MAY Beauty Ltd | Other services | 2020 |
| Trade Engine Limited | Professional & scientific | 2016 |
| Traderman Holdings Limited | Extraterritorial | 1993 |
| Traderman Systems Ltd | Extraterritorial | 1989 |
| Traditional Coasters Ltd | Manufacturing | 2019 |
| Traditional Umbrellas Limited | Administrative & support | 2018 |
| Traffic Marketing & Communications Limited | Professional & scientific | 2007 |
| Trailer Engineering Limited | Manufacturing | 1982 |
| Transafe Consultancy Ltd | Transport & logistics | 2024 |
| Transform Your Home Ltd | Construction | 2015 |
| Transformwithje Ltd | Professional & scientific | 2026 |
| Transport & Warehousing Staff Suppliers Limited | Administrative & support | 2003 |
| Transport Store and More Ltd | Transport & logistics | 2019 |
| Travels Ceylon International Limited | Administrative & support | 2025 |
| Tree Health Consulting Limited | Professional & scientific | 2003 |
| Trega Training Ltd | Construction | 2018 |
| Trendesign U.K. Ltd | Manufacturing | 2016 |
| Trident Elite Holdings Ltd | Financial services | 2023 |
| Trident Investments (London) Limited | Real estate | 2008 |
| Trifecta Media Ltd | Administrative & support | 2011 |
| Trinity Edwards Ltd | Health & social care | 2021 |
| Triple 8 Logistics Ltd | Transport & logistics | 2019 |
| Triple a Ventures Group Ltd | Administrative & support | 2024 |
| Trisport Limited | Manufacturing | 1999 |
| TRM Lean Consultancy Limited | Professional & scientific | 2017 |
| Trophystore.Co.Uk Limited | Wholesale & retail | 2009 |
| True Ambition Hairdressing Limited | Financial services | 2019 |
| True Desire Limited | Other services | 2017 |
| True Zeal Limited | Other services | 2017 |
| Truecraft Ventures Ltd | Hospitality | 2025 |