| T&S Water Co. Ltd | Wholesale & retail | 2025 |
| T&S Xxiii Limited | Health & social care | 2022 |
| T&T Collective Advertising Ltd | Professional & scientific | 2025 |
| T&T Pet Treats Limited | Wholesale & retail | 2022 |
| T.J.C Motors Ltd | Wholesale & retail | 2024 |
| T.Payne Woodworkx Ltd | Manufacturing | 2026 |
| T.T. Tents Limited | Extraterritorial | 2018 |
| TA Europe Ltd | Wholesale & retail | 2025 |
| Taaa Limited | Transport & logistics | 2024 |
| Tabora-Mabini Limited | Water & waste | 2026 |
| Tadley Kebabs Ltd | Hospitality | 2025 |
| TAG Advisory Ltd | Professional & scientific | 2026 |
| Tailored IT Services Ltd | Information & communication | 2021 |
| Take Shape Design Limited | Professional & scientific | 2022 |
| Takex Europe Limited | Manufacturing | 1989 |
| Talaris Holdings (Brazil) Limited | Manufacturing | 2008 |
| Talent Management International Limited | Professional & scientific | 2003 |
| Talk Consulting Ltd | Professional & scientific | 2018 |
| Talk Telecom Ltd | Information & communication | 2012 |
| Talkabout BTL Limited | Real estate | 2003 |
| Talking Fire CIC | Other services | 2023 |
| Talli Tigers Ltd | Administrative & support | 2025 |
| Tally HO Lodge Management Limited | Households | 1995 |
| Talven Systems Ltd | Information & communication | 2026 |
| Tamary Limited | Health & social care | 2023 |
| Tamno Limited | Health & social care | 2023 |
| Tandelroo Ltd | Health & social care | 2022 |
| Tansids Limited | Real estate | 2021 |
| TAPIWA24 Ltd | Other services | 2012 |
| Taran Managed Services Ltd | Information & communication | 2024 |
| Taran Microsystems Holdings Limited | Financial services | 2014 |
| Taran Microsystems Limited | Manufacturing | 1992 |
| Taran UK Limited | Professional & scientific | 2001 |
| Target Enterprises Limited | Information & communication | 2018 |
| Tashi Trading Limited | Manufacturing | 2025 |
| Task Done Ltd | Transport & logistics | 2025 |
| Taskadept Limited | Information & communication | 2014 |
| Tate Investment & Management Services Ltd | Real estate | 2022 |
| Tatenda Accounting Services Limited | Information & communication | 2011 |
| Taurus Talent Ltd | Transport & logistics | 2025 |
| Tax Adviser Accountants Ltd | Professional & scientific | 2010 |
| Tax IS Taxing Ltd | Professional & scientific | 2023 |
| Taxative Ltd | Professional & scientific | 2020 |
| Tayerly Services Ltd | Professional & scientific | 2023 |
| Tayland Properties Ltd | Real estate | 2024 |
| Taylor Made Golf Limited | Wholesale & retail | 1979 |
| Taylor Tranckle PMU Ltd | Other services | 2020 |
| Taylor Your Training Ltd | Administrative & support | 2025 |
| TB Payroll Consulting Ltd | Professional & scientific | 2026 |
| TBA Repairs Ltd | Manufacturing | 2026 |
| Tcdn Investments Limited | Financial services | 2026 |
| TCP REX Limited | Administrative & support | 2023 |
| TD Finance UK Limited Partnership | | 1999 |
| TD Funding UK Limited | Financial services | 2021 |
| TD Synnex Advanced Services Limited | Information & communication | 1997 |
| TD Synnex Capital UK Limited | Financial services | 2022 |
| TD Synnex Finance Limited | Financial services | 2021 |
| TD Synnex Supply Chain Services Limited | Professional & scientific | 2002 |
| TD Synnex UK Acquisition Limited | Professional & scientific | 2002 |
| TD Synnex UK Finance Limited | Financial services | 2016 |
| TD Synnex UK Limited | Wholesale & retail | 1983 |
| TD Synnex UK Resources Limited | Financial services | 2016 |
| TD Treasury UK Ltd | Financial services | 2021 |
| TD UK Holding Ltd | Financial services | 2021 |
| TDD Holdings Limited | Financial services | 2023 |
| Teagether Limited | Hospitality | 2018 |
| Teak Holdings UK Ltd | Wholesale & retail | 2025 |
| Team Ellarby Ltd | Real estate | 2025 |
| Teana London Limited | Information & communication | 2015 |
| TEC DOT Limited | Manufacturing | 2010 |
| Tech Data Holding Limited | Financial services | 2017 |
| Tech Data UK Finance Partner Limited | Financial services | 2017 |
| Tech Flush Limited | Information & communication | 2026 |
| Techdirectuk Limited | Wholesale & retail | 2018 |
| Techiemax UK Limited | Information & communication | 2018 |
| Techner Ltd | Information & communication | 2010 |
| Technesoft Limited | Information & communication | 2012 |
| Technical Business Solutions Limited | Information & communication | 2024 |
| Technical Solutions Workforce Ltd | Construction | 2026 |
| Technichel IT Ltd | Information & communication | 2016 |
| Technidrains Civils & Utilities Ltd | Water & waste | 2021 |
| Technimotors Ltd | Wholesale & retail | 2025 |
| Techniverse PVT. Ltd | Information & communication | 2022 |
| Technobizzkit Ltd | Information & communication | 2020 |
| Technologic Solutions Limited | Information & communication | 2023 |
| Technology Community for Racial Equality C.I.C. | Other services | 2025 |
| Techpoint Electronic Solutions Limited | Manufacturing | 2007 |
| Techpoint Fast Track Solutions Limited | Manufacturing | 1986 |
| Techsuite Consulting Limited | Information & communication | 2023 |
| Tecnoz Solutions Limited | Information & communication | 2021 |
| Tecprime Technology Limited | Manufacturing | 2004 |
| Tedko Ltd | Professional & scientific | 2013 |
| Teethwise Limited | Health & social care | 2012 |
| Tegara Ltd | Extraterritorial | 2019 |
| Tejgroup Ltd | Professional & scientific | 2023 |
| Tekio Ltd | Information & communication | 2018 |
| Tekspark Limited | Information & communication | 2024 |
| Telecall Limited | Professional & scientific | 1980 |
| Telecential Communications (Warwickshire) Limited Partnership | | 1994 |
| Telephone Rentals Limited | Information & communication | 2007 |