| Tjqs Properties Limited | Real estate | 2024 |
| TJV Building Co Ltd | Construction | 1997 |
| TK Barber(Uk) Ltd | Other services | 2025 |
| TK Trading Corporation Ltd Ltd | Wholesale & retail | 2024 |
| TK1 Motors Ltd | Administrative & support | 2020 |
| TKC Holdings Ltd | Extraterritorial | 2008 |
| TKC Properties Ltd | Real estate | 2008 |
| Tklicks Limited | Wholesale & retail | 2025 |
| Tkph Ltd | Real estate | 2023 |
| TKT Medical Limited | Health & social care | 2008 |
| Tktpizza Ltd | Hospitality | 2024 |
| TL Bullion Ltd | Water & waste | 2026 |
| Tlaloc Limited | Information & communication | 2011 |
| TLJ Holdings Ltd | Financial services | 2026 |
| TLM Events Ltd | Hospitality | 2022 |
| TLP Builder Ltd | Construction | 2026 |
| Tlpc Group Ltd | Construction | 2018 |
| Tlrey Ltd | Professional & scientific | 2025 |
| Tlssupplies Ltd | Administrative & support | 2023 |
| TLT Logistics 0 Limited | Transport & logistics | 2026 |
| TLZ Limited | Construction | 2025 |
| TM David Holdings Ltd | Real estate | 2023 |
| TM Express Ltd | Transport & logistics | 2021 |
| TM Investment Portfolio Ltd | Real estate | 2018 |
| TM Investments Portfolio LLP | | 2019 |
| TM Patient Services Ltd | Transport & logistics | 2011 |
| TM Removal Services Ltd | Transport & logistics | 2024 |
| Tm&Z Limited | Real estate | 2019 |
| TMA Accountants Ltd | Professional & scientific | 2007 |
| TMC London Limited | Administrative & support | 2026 |
| TMD Design and Build Ltd | Construction | 2022 |
| TMD Forward Ltd. | Transport & logistics | 2015 |
| TMF Investment Group Ltd | Administrative & support | 2023 |
| TMK Marquees Ltd | Education | 2024 |
| Tmladip Limited | Health & social care | 2021 |
| Tmndd Trade Ltd | Construction | 2025 |
| TMS Tradelinks Limited | Wholesale & retail | 2025 |
| Tmstkm Property Ltd | Real estate | 2025 |
| TMV Construction Ltd | Construction | 2024 |
| TMZ Consultants Ltd | Administrative & support | 2025 |
| TN Developers Limited | Construction | 2025 |
| TN Sports Ltd | Wholesale & retail | 2019 |
| Tnest Ltd | Real estate | 2026 |
| Tnet Systems Limited | Information & communication | 2017 |
| Tnft Prop 107 Ltd | Real estate | 2023 |
| Tnft Prop 110 Ltd | Real estate | 2023 |
| Tnft Prop 126 Ltd | Real estate | 2023 |
| Tnft Prop 161 Ltd | Real estate | 2023 |
| Tnft Prop 201 Ltd | Real estate | 2023 |
| Tnft Prop 202 Ltd | Real estate | 2023 |
| Tnft Prop 70 Ltd | Real estate | 2023 |
| Tnft Prop 73 Ltd | Real estate | 2023 |
| TNL Development Ltd | Construction | 2023 |
| Tnpf | Other services | 2015 |
| TNS Fire Ltd | Construction | 2019 |
| TNS Global Ltd | Construction | 2026 |
| TO BE Frank Production Limited | Information & communication | 2021 |
| Toader Logistics Ltd | Transport & logistics | 2025 |
| TOB Coaching Limited | Information & communication | 2018 |
| Tob-Datam Venture Ltd | Information & communication | 2024 |
| Tobias Properties Ltd | Real estate | 2013 |
| Toff's Dog Grooming Studio and Spa Ltd | Other services | 2022 |
| Toflan Construction Limited | Manufacturing | 2025 |
| Tofulet Ltd | Construction | 2016 |
| Toga Estates Ltd | Real estate | 2024 |
| Toga INT Limited | Information & communication | 2012 |
| Togar (London) Limited | Construction | 2019 |
| Toilet Hire London Ltd | Water & waste | 2018 |
| Tojenergy Ltd | Construction | 2025 |
| Tokamak Limited | Information & communication | 2018 |
| Tokari Ltd. | Financial services | 2016 |
| Tokefimas Ltd | Hospitality | 2022 |
| Tokyo Clothings.Uk Ltd | Wholesale & retail | 2025 |
| Tokyo Creates Limited | Information & communication | 2023 |
| Tokyo SIN Ltd | Wholesale & retail | 2025 |
| Tolhelm Limited | Extraterritorial | 1989 |
| TOM Advisory Services Ltd | Administrative & support | 2021 |
| TOM Fresh Limited | Wholesale & retail | 2015 |
| TOM Rutland Holdings Limited | Financial services | 2018 |
| Tomex Construction Ltd | Construction | 2026 |
| Tomlaans Ltd | Construction | 2018 |
| Tommy C Transport Limited | Transport & logistics | 2019 |
| Tomorrowbyte Ltd | Information & communication | 2025 |
| Tomswood Hill Properties Ltd | Other services | 2019 |
| Tomswood Lodge Ltd | Health & social care | 2002 |
| Tomswood Properties Ltd | Real estate | 2015 |
| TON Concrete & Building Services Limited | Construction | 2025 |
| Toni Hussain Ltd | Real estate | 2018 |
| Toniks London Ltd | Construction | 2019 |
| Tony C Construction Ltd | Construction | 2025 |
| Tony Hudson Limited | Wholesale & retail | 2005 |
| Tony Power Limited | Manufacturing | 2018 |
| Tony's Buy's Ltd | Wholesale & retail | 2025 |
| Tonytigana Ltd | Wholesale & retail | 2026 |
| TOO Secure Ltd | Administrative & support | 2021 |
| Toor Close Ltd | Real estate | 2023 |
| Toothgem Ltd | Hospitality | 2017 |
| Top Accessories Ltd | Wholesale & retail | 2025 |
| Top Advice Limited | Professional & scientific | 2018 |
| Top Celine Ltd | Construction | 2023 |