| TRINITY333 Ltd | Transport & logistics | 2025 |
| Trion UK Ltd | Real estate | 2026 |
| Tripartite Digital Solutions Ltd | Information & communication | 2025 |
| Triple R (Ipswich) Ltd | Transport & logistics | 2017 |
| Tripleguard Security Services Limited | Administrative & support | 2025 |
| Triton London Private Limited | Hospitality | 2025 |
| Trivium Developments Limited | Construction | 2026 |
| Tronk Solutions Limited | Information & communication | 2019 |
| Troopertrans Ltd | Transport & logistics | 2016 |
| Trophy by Lissie Ltd | Wholesale & retail | 2026 |
| Tropical Flair Limited | Wholesale & retail | 2025 |
| Tropicsun Ltd | Other services | 2026 |
| Troupe Limited | Education | 2021 |
| Trowelling Monk Limited | Construction | 2025 |
| TRU Demolition Limited | Construction | 2009 |
| TRU Earthworks Ltd | Construction | 2019 |
| TRU Henham Quarry Limited | Mining & quarrying | 2026 |
| TRU MIX Limited | Manufacturing | 2016 |
| TRU Rent Limited | Extraterritorial | 2018 |
| TRU7 Group Limited | Financial services | 2023 |
| TRU7 Limited | Wholesale & retail | 1938 |
| Truck and Van Gear Limited | Wholesale & retail | 2014 |
| Truck Speditions Ltd | Transport & logistics | 2019 |
| Truckets Trustees Limited | Professional & scientific | 2012 |
| Truckit Ltd | Transport & logistics | 2018 |
| Truckpro 24/7 Limited | Wholesale & retail | 2025 |
| Trucks "R" US Limited | Professional & scientific | 1993 |
| True Brazilian Flavour Ltd | Wholesale & retail | 2025 |
| True CAB Services Limited | Transport & logistics | 2026 |
| True Care and Companionship Limited | Health & social care | 2023 |
| True Cars Limited | Wholesale & retail | 2023 |
| True Dwellings Limited | Real estate | 2023 |
| True Grit Microcement Ltd | Construction | 2024 |
| True Nest Care Limited | Administrative & support | 2024 |
| True North Electrical Ltd | Construction | 2013 |
| True Voice Ltd | Education | 2026 |
| Trueark Healthcare Limited | Health & social care | 2016 |
| Truefit Kitchen Installations Ltd | Construction | 2025 |
| Truescape Ltd | Real estate | 2018 |
| Truetech Vehicle Services Ltd | Manufacturing | 2023 |
| Truetrade Global Corridor Ltd | Wholesale & retail | 2025 |
| Truguard Home Improvements Limited | Administrative & support | 2018 |
| Truly Inspired Ltd | Other services | 2016 |
| Truplant Ltd | Extraterritorial | 2019 |
| Trust Energy Limited | Construction | 2013 |
| Trustcoaching Ltd | Administrative & support | 2017 |
| Trustic Motors Ltd. | Wholesale & retail | 2020 |
| TRUSTING101 Ltd | Wholesale & retail | 2023 |
| Truth OR Dare Limited | Professional & scientific | 2022 |
| Truth Theory Ltd | Information & communication | 2012 |
| Trutrak Pro Limited | Information & communication | 2020 |
| Truview GPS Ltd | Information & communication | 2024 |
| TRV Rental Ltd | Real estate | 2025 |
| TRW Consulting (UK) Limited | Professional & scientific | 2013 |
| TRY Financial Ltd | Financial services | 2013 |
| TS Autos Baylham Limited | Wholesale & retail | 2025 |
| TS Elec Ltd | Construction | 2019 |
| Tsamko Ltd | Information & communication | 2026 |
| Tsdr Properties Limited | Real estate | 2017 |
| TSG Trans Ltd | Transport & logistics | 2025 |
| TSL Facilities Management Services Limited | Professional & scientific | 2020 |
| TSL Medical Limited | Administrative & support | 2020 |
| TSL Security Limited | Administrative & support | 2020 |
| TSL Security Systems Limited | Administrative & support | 2020 |
| TSL Services Group Limited | Administrative & support | 2019 |
| Tsoh Holdings Ltd | Financial services | 2010 |
| Tsst Limited | Professional & scientific | 2014 |
| TSV Supply Chain UK Ltd | Transport & logistics | 2024 |
| TT Global Management Services Ltd | Administrative & support | 2021 |
| TT Ipswich Ltd | Wholesale & retail | 2025 |
| TTB Consulting Services Limited | Construction | 2018 |
| TTC Suffolk Limited | Health & social care | 2025 |
| TTC Theatre Productions Ltd | Education | 2019 |
| TTG Baron Properties Limited | Real estate | 1996 |
| Ttrd Vault Ltd | Wholesale & retail | 2026 |
| TTV Industrial Ltd | Manufacturing | 2002 |
| Tucker Hammett Electrical Limited | Construction | 1999 |
| Tuddenham Holdings Limited | Arts & recreation | 2001 |
| Tuddenham Properties Ltd | Real estate | 2020 |
| Tuddenham Property Services Ltd | Administrative & support | 2018 |
| Tudor G Transport Ltd | Administrative & support | 2017 |
| Tudor Popa Ltd | Transport & logistics | 2025 |
| Tudor Trading (Modular) Limited | Construction | 2002 |
| Tudor Trading Modular Hire & Sales Ltd | Construction | 2015 |
| Tudor Valois International Ltd | Administrative & support | 2023 |
| TUF Transport Ltd | Transport & logistics | 2020 |
| Tuffaha Medical Services Ltd. | Health & social care | 2015 |
| Tufy Ltd | Transport & logistics | 2019 |
| Tuga Rootz Ltd | Hospitality | 2023 |
| Tuition Services Ltd | Hospitality | 2015 |
| Tuke Manton Architects LLP | | 2005 |
| Tumarc Limited | Information & communication | 2001 |
| Tumarc Solutions Limited | Financial services | 2017 |
| Tunic Transport Limited | Transport & logistics | 2025 |
| Tupinamba (UK) Limited | Wholesale & retail | 2018 |
| Turassa Ltd | Hospitality | 2018 |
| Turbine Services Limited | Professional & scientific | 1980 |
| Turftree Limited | Households | 2021 |
| Turkan SA Ltd | Hospitality | 2019 |
| Turkish Art Barbers Ltd | Wholesale & retail | 2018 |