| Tara Private Limited | Wholesale & retail | 2025 |
| Tareo Group Limited | Extraterritorial | 2023 |
| Tareo UK Limited | Wholesale & retail | 2014 |
| Target Blue Solutions Ltd | Wholesale & retail | 2025 |
| Target Driver Recruitment Ltd | Administrative & support | 2025 |
| Target Fuels & Machinery Ltd | Wholesale & retail | 2015 |
| Target Internet Ltd | Information & communication | 2001 |
| Target Network Group Ltd | Financial services | 2025 |
| Tarlan Group Limited | Financial services | 2025 |
| Tarmec Limited | Construction | 1981 |
| Taromina Limited | Professional & scientific | 2018 |
| Tarragon Trading Limited | Hospitality | 2017 |
| Tarring Park Limited | Health & social care | 2021 |
| Tarring Priory Ltd | Health & social care | 2013 |
| TAS Staffing Group Ltd | Administrative & support | 2023 |
| Task Fulfilment Limited | Administrative & support | 2001 |
| Tasty Thrive Marketing Ltd | Professional & scientific | 2025 |
| Tatam Contracts Ltd | Construction | 2024 |
| Tatams of Chappel Ltd | Wholesale & retail | 2003 |
| Taurus Property Development Ltd | Construction | 2018 |
| Tavernal Ltd | Health & social care | 2019 |
| Tavismanor Limited | Manufacturing | 1984 |
| Tavla (EN) Ltd | Hospitality | 2020 |
| Tawa Junction Ltd | Hospitality | 2025 |
| Tawell Mews 1962 Limited | Extraterritorial | 2014 |
| Tawnymere Limited | Households | 1994 |
| Tax Management Ltd | Wholesale & retail | 2018 |
| Taxeazee UK Ltd | Professional & scientific | 2025 |
| Taxinow Contract Services Limited | Transport & logistics | 2010 |
| Taybray Ltd | Professional & scientific | 2007 |
| Tayla'D Aesthetics Ltd | Other services | 2024 |
| Taylor and Davis Limited | Professional & scientific | 2005 |
| Taylor Hill Capital Limited | Professional & scientific | 2021 |
| Taylor Lawncare Ltd | Administrative & support | 2016 |
| Taylor Rushby Limited | Professional & scientific | 2010 |
| Taylor Taylor London Limited | Professional & scientific | 2006 |
| Taylor Webb Developments Limited | Construction | 2019 |
| Taylor Webb Group Limited | Construction | 2019 |
| Taylormation Ltd | Information & communication | 2010 |
| Taylors Civil Engineering Ltd | Construction | 2014 |
| Tayyib Properties Ltd | Households | 2025 |
| TAZ Beauty Lctr UK Limited | Other services | 2025 |
| TB Facilities Ltd | Construction | 2017 |
| TBC Developments Limited | Professional & scientific | 2015 |
| TBL Roofing Limited | Construction | 2018 |
| TBL Roofing Solutions Ltd | Construction | 2023 |
| TBW Creative Limited | Professional & scientific | 2012 |
| TBW Transport Ltd | Transport & logistics | 2022 |
| TC Accountants 024 Limited | Professional & scientific | 2024 |
| TC Compassionate Care Limited | Health & social care | 2016 |
| TC Eastern Limited | Administrative & support | 2018 |
| TC Middleton Anglia Limited | Construction | 2021 |
| TCG Master Ltd | Wholesale & retail | 2021 |
| Tchewy Collectables Ltd | Wholesale & retail | 2024 |
| TCL Touring Ltd | Professional & scientific | 2022 |
| TCM Living Ltd | Financial services | 2016 |
| TCM Soil Solutions Limited | Water & waste | 2014 |
| Tcmc Furniture Limited | Manufacturing | 2015 |
| TCR Global Ltd | Professional & scientific | 2024 |
| TDA Structures Limited | Professional & scientific | 2003 |
| TDB Roots Ltd | Real estate | 2023 |
| TDDNL100 Ltd | Wholesale & retail | 2025 |
| TDL Construction Ltd | Construction | 2025 |
| TDT Enterprises Limited | Wholesale & retail | 2002 |
| Tea Global Investment Ltd | Wholesale & retail | 2025 |
| Teaboy Games Ltd | Information & communication | 2015 |
| Teacup Press Ltd | Arts & recreation | 2023 |
| Teak Capital Ltd | Financial services | 2025 |
| Tealygreen Collectables Ltd | Wholesale & retail | 2025 |
| Team AB Services Limited | Construction | 2013 |
| Team Dandelion CIC | Education | 2026 |
| Team Jafit Ltd | Education | 2023 |
| Teas of Ceylon Ltd | Wholesale & retail | 2016 |
| Teat Healthcare Services Ltd | Administrative & support | 2018 |
| TEC Construction (East Anglia) Limited | Construction | 2021 |
| Tech Coaching Hub Ltd | Information & communication | 2026 |
| Tech FIX Mobile Repair & Accessories Ltd | Other services | 2025 |
| Techaide Limited | Professional & scientific | 2002 |
| Techbeat Marketing Limited | Professional & scientific | 2015 |
| Technafy Ltd | Information & communication | 2022 |
| Technexus Limited | Information & communication | 2009 |
| Technical Accounting Bureaux Services Limited | Information & communication | 2009 |
| Technik Intelligent Systems Ltd. | Information & communication | 2013 |
| Technipro Solutions Ltd | Construction | 2015 |
| Technique Building Management Limited | Households | 2001 |
| Technology Relations Limited | Administrative & support | 1986 |
| Technotrans Thermal Technology Limited | Manufacturing | 1991 |
| Techogee Ltd | Information & communication | 2023 |
| Techson Services Ltd | Information & communication | 2024 |
| Techthrust Consulting Limited | Information & communication | 2025 |
| Techtortoise Limited | Professional & scientific | 2013 |
| Techtrade Engineering (Europe) Limited | Professional & scientific | 2006 |
| Techtrue Limited | Information & communication | 2022 |
| Techvast Media Limited | Information & communication | 2025 |
| Tecnika Architectural Solutions Limited | Professional & scientific | 2023 |
| Tecno.Team UK Limited | Manufacturing | 2019 |
| TEE Medicals Limited | Health & social care | 2023 |
| Teebob Ltd | Construction | 2020 |
| Teemah Properties Ltd | Real estate | 2020 |
| Teeskymedic Ltd | Hospitality | 2020 |