| Tappetyclick Ltd | Information & communication | 2015 |
| Taptap Regulation Ltd | Information & communication | 2025 |
| Taptonville House Limited | Health & social care | 2006 |
| Tarak 01 Limited | Information & communication | 2017 |
| Taramic Limited | Other services | 2016 |
| Target Business Development Ltd | Professional & scientific | 2008 |
| Target Flooring (Holdings) Limited | Financial services | 1977 |
| Target Furniture Group Limited | Financial services | 2003 |
| Target Furniture Limited | Manufacturing | 1978 |
| Tariq Javed Trading Limited | Wholesale & retail | 2026 |
| Tarlton Media Ltd | Professional & scientific | 2022 |
| Tarsh Enterprise Limited | Professional & scientific | 2023 |
| Tarynatt Healthcare Limited | Health & social care | 2022 |
| Tasc Group Limited | Administrative & support | 2019 |
| Tascianu Trans Ltd | Transport & logistics | 2017 |
| Tashi Valet Car Wash Ltd | Other services | 2015 |
| Tashpay Limited | Other services | 2015 |
| Taskut Limited | Other services | 2019 |
| Tasl Holdings Limited | Financial services | 2020 |
| Tasl Properties Limited | Real estate | 2022 |
| Tast Ltd | Manufacturing | 2021 |
| Taste America Limited | Wholesale & retail | 2010 |
| Taste of Lahore Limited | Hospitality | 2015 |
| Taste of Snowdonia Ltd | Hospitality | 2018 |
| Taste PT by Sandra Ltd | Hospitality | 2026 |
| Tastefans Ltd | Hospitality | 2024 |
| Tastelyfe Therapies Ltd | Health & social care | 2019 |
| Tasty Chickens NN1 Limited | Hospitality | 2023 |
| Tasty Drinks Limited | Wholesale & retail | 2021 |
| Tasty Shawarma Lings Ltd | Hospitality | 2025 |
| Tasty Welcome Limited | Hospitality | 2024 |
| Tatiane Limited | Administrative & support | 2021 |
| Tatnell Engineering Services Limited | Manufacturing | 2012 |
| Tattenhoe PRS Ltd | Real estate | 2024 |
| Tattoos Beards Cocktails Limited | Professional & scientific | 2018 |
| Tauron-Trans Limited | Transport & logistics | 2015 |
| Taurus Handling Ltd | Manufacturing | 2009 |
| Tavi & Yanis DNK Ltd | Wholesale & retail | 2017 |
| Tavi & Yanis Solution Ltd | Administrative & support | 2024 |
| Tavistock Finance Limited | Financial services | 2002 |
| Tawana Autos Ltd | Wholesale & retail | 2019 |
| Tawanda Churu Ltd | Other services | 2019 |
| Tawi UK Limited | Administrative & support | 1997 |
| Tawood Limited | Manufacturing | 2011 |
| Tax Experts (Northampton) Ltd | Professional & scientific | 2013 |
| Tax Index Limited | Professional & scientific | 2026 |
| Tax-World (UK) Limited | Professional & scientific | 2012 |
| Taxeuk.Com Ltd. | Professional & scientific | 2015 |
| Taxfox Limited | Information & communication | 2018 |
| Taxi Go&Fly Ltd | Transport & logistics | 2025 |
| Taxi Northampton Ltd | Transport & logistics | 2019 |
| Taxi Replacement Specialists Ltd | Transport & logistics | 2018 |
| Taxtrim Solutions Ltd | Extraterritorial | 2025 |
| Tayflor Limited | Wholesale & retail | 2013 |
| Taylign Solutions Limited | Wholesale & retail | 2010 |
| Taylor Greaves Developments Ltd | Real estate | 2014 |
| Taylor Ingman Windows and Carpentry Limited | Manufacturing | 2019 |
| Taylor Meanwell Ltd | Real estate | 2021 |
| Taylor Plumbing & Heating Services Limited | Construction | 2005 |
| Taylor-Kightley Engineering Company Limited | Manufacturing | 1965 |
| Taylor-Made HR Ltd | Administrative & support | 2025 |
| Taylorfitch Limited | Information & communication | 2003 |
| Taylors Court Harpole Management Company Limited | Households | 2017 |
| Taylors Dairies (Milton Keynes) Limited | Wholesale & retail | 1965 |
| TAZ Motors Wellingborough Ltd | Wholesale & retail | 2024 |
| TAZ30 Limited | Transport & logistics | 2010 |
| TB 57 Limited | Manufacturing | 2026 |
| TB Detailing Ltd | Wholesale & retail | 2026 |
| TB Project Management Consultancy Limited | Professional & scientific | 2014 |
| TB Property Limited | Real estate | 2021 |
| TBBEST24 Ltd | Other services | 2024 |
| TBE Consultants Ltd | Administrative & support | 2018 |
| TBG by Fryers Limited | Other services | 2025 |
| TBS Bucks UK Ltd | Construction | 2017 |
| TBS UK Joinery Ltd | Manufacturing | 2017 |
| Tbuild Building Services Ltd | Construction | 2024 |
| TBV Axemasters Northants Ltd | Arts & recreation | 2023 |
| TC Building Limited | Construction | 2015 |
| TC SEM Limited | Professional & scientific | 2023 |
| TC SEM Partnership LLP | | 2023 |
| TC Service Charge Limited | Professional & scientific | 2023 |
| TC123 Limited | Administrative & support | 2013 |
| TCB Property Investments Ltd | Real estate | 2024 |
| Tcbc Offices Ltd | Administrative & support | 2014 |
| TCG Drivers Limited | Transport & logistics | 2019 |
| TCH Healthcare Limited | Financial services | 2026 |
| TCL Landscaping Group Limited | Administrative & support | 2022 |
| TCL Property Group Limited | Real estate | 2023 |
| TCN Online Limited | Information & communication | 2024 |
| TDB Real Estate Partners Limited | Real estate | 2024 |
| TDE Logistics Ltd | Transport & logistics | 2022 |
| TDG (UK) Limited | Professional & scientific | 1954 |
| TDG Limited | Professional & scientific | 1949 |
| TDK Architectural Hardware Limited | Wholesale & retail | 2002 |
| TDK Detailing Ltd | Wholesale & retail | 2016 |
| Tea and Tusk Ltd | Wholesale & retail | 2026 |
| Tea's Top Trades Ltd | Wholesale & retail | 2025 |
| Teacher Tax Rebates Limited | Information & communication | 2020 |
| Teachers and Academic Personnel Limited | Education | 2000 |
| Teakwood Properties Ltd | Real estate | 2022 |