| Timeless Tones Ltd | Construction | 2021 |
| Tinker Design Limited | Professional & scientific | 2015 |
| Tipplers Food & Wine Ltd | Wholesale & retail | 2025 |
| Titans Diagnostics Ltd | Health & social care | 2012 |
| Titans of Enterprise Limited | Real estate | 2023 |
| TJ & AR Properties Ltd | Real estate | 2025 |
| TJ Barbers Ltd | Other services | 2025 |
| TJB Apartments Limited | Real estate | 2020 |
| TK Anaesthetic Services Ltd | Health & social care | 2013 |
| Tllm Limited | Information & communication | 2018 |
| TLO Consultancy Services Limited | Professional & scientific | 2024 |
| Tlpp Ltd | Real estate | 2019 |
| TLT Spirit CIC | Health & social care | 2021 |
| TMN Investments Ltd | Real estate | 2020 |
| TMS Logistics Ltd | Transport & logistics | 2019 |
| TMT Boilers Limited | Construction | 2020 |
| TMT Central Ltd | Other services | 2018 |
| TNT Homes Limited | Real estate | 2019 |
| Today in Space Limited | Other services | 2024 |
| Todicare Limited | Wholesale & retail | 2021 |
| Todo Worldwide Ltd | Wholesale & retail | 2017 |
| Together HK CIC | Education | 2025 |
| Together Staffing Solutions Ltd | Administrative & support | 2025 |
| Together WE Soar Consulting Ltd | Other services | 2025 |
| TOM Rosenbaum Limited | Administrative & support | 2011 |
| Tomytrans Serv Ltd | Transport & logistics | 2022 |
| Tonberry UK Limited | Real estate | 2017 |
| Tonestar Consulting Ltd | Professional & scientific | 2006 |
| Tongues on Fire Limited | Other services | 2001 |
| Tony Cawley Analysis Limited | Professional & scientific | 2024 |
| Top Four Real Estate Limited | Real estate | 2022 |
| Top KEK Ltd | Professional & scientific | 2020 |
| Top Nosh Marketing Limited | Administrative & support | 2009 |
| Top Quality Suites Ltd | Hospitality | 2022 |
| Top Rise Investments Ltd | Financial services | 2024 |
| Top Stars 11 Ltd | Arts & recreation | 2015 |
| Topcraft Limited | Households | 1998 |
| Topfinders Ltd | Wholesale & retail | 2025 |
| Topjob Roofing Limited | Administrative & support | 2013 |
| Tora-Kai Karate Limited | Wholesale & retail | 2025 |
| Torsion Building Services Ltd | Construction | 2019 |
| Total Heliski Limited | Administrative & support | 2009 |
| Total Property Management Services Limited | Administrative & support | 2018 |
| Total Tech Solutions Limited | Information & communication | 2013 |
| Totally Massive Ltd | Information & communication | 2022 |
| Toteallyembroidery Ltd | Arts & recreation | 2021 |
| Touchdown Limited | Real estate | 1990 |
| Touched by Nature Limited | Wholesale & retail | 2022 |
| Toutche Limited | Manufacturing | 2021 |
| Tower Bridge Mews RTM Company Limited | Households | 2009 |
| Tower Residences Limited | Financial services | 2025 |
| TP Civils Limited | Construction | 2019 |
| TPA Group Ltd | Wholesale & retail | 2022 |
| Tpse Ltd | Administrative & support | 2017 |
| TR Japanese Food Ltd | Hospitality | 2023 |
| Track Wheel Car Services Limited | Wholesale & retail | 2023 |
| Tradeguard Corporate Lawyers Limited | Professional & scientific | 2025 |
| Traditional Foods and Deserts Ltd | Manufacturing | 2019 |
| Traina Textiles Ltd | Other services | 2010 |
| Trainsync Ltd | Arts & recreation | 2026 |
| Tranquil Holdings Limited | Real estate | 2024 |
| Trans Afric Shipping & Trading Limited | Wholesale & retail | 2017 |
| Trans Africa International Limited | Wholesale & retail | 2019 |
| Transfleet Trading Limited | Wholesale & retail | 2025 |
| Transient Limited | Arts & recreation | 2006 |
| Transition Financial Planning Ltd | Financial services | 2026 |
| Trapeze Music & Entertainment Limited | Information & communication | 2008 |
| Trapeze Music Ltd | Financial services | 2015 |
| Trapeze Music Publishing Limited | Extraterritorial | 2010 |
| Travel Agency Services Ltd | Administrative & support | 2019 |
| TRB Construct Ltd | Construction | 2017 |
| Treacl Ltd | Professional & scientific | 2010 |
| Treat Beauty London Ltd | Wholesale & retail | 2020 |
| Treat ME Better Ltd | Manufacturing | 2025 |
| Treat Medi Spas Ltd | Administrative & support | 2009 |
| Treat Trove Ltd | Wholesale & retail | 2026 |
| Trendinguk Ltd | Wholesale & retail | 2025 |
| Tributum Consulting Ltd | Real estate | 2019 |
| Trident Capital Intl Ltd | Real estate | 2023 |
| Trident Consultants (UK) Limited | Professional & scientific | 2024 |
| Trident Real Estate Limited | Construction | 2021 |
| Trilog Solutions Ltd | Information & communication | 2011 |
| Trin Consultants Ltd | Professional & scientific | 2026 |
| Trinetra Estates Ltd | Real estate | 2025 |
| Triniti Care Limited | Health & social care | 2025 |
| Trinity Activity Group Ltd | Health & social care | 2024 |
| Trinity Square Limited | Wholesale & retail | 2011 |
| Triple Key Management Limited | Real estate | 2026 |
| Tristry Ltd | Education | 2024 |
| Trivision-Uk Ltd | Real estate | 2023 |
| Tron Finance Limited | Administrative & support | 2013 |
| Trre Property Group Limited | Real estate | 2020 |
| TRU Align Ltd | Health & social care | 2023 |
| True Essence Movement Limited | Other services | 2020 |
| True Tenancy Cleaners Limited | Administrative & support | 2025 |
| Truepath Recovery Housing CIC | Real estate | 2026 |
| Trupti Investments Ltd | Real estate | 2019 |
| Truro Works Limited | Construction | 2018 |
| Trustbridge Franchise Limited | Administrative & support | 2026 |
| Trusted Tax Solutions Ltd | Professional & scientific | 2024 |