| T2V Recruitment Limited | Administrative & support | 2024 |
| T9 Limited | Hospitality | 2018 |
| TA Brothers Limited | Information & communication | 2015 |
| TAB 21 Limited | Construction | 2014 |
| Taberna Limited | Hospitality | 2004 |
| Tabita Health Limited | Health & social care | 2025 |
| Tabl Limited | Hospitality | 2013 |
| Table of the Elements Ltd | Information & communication | 2025 |
| Table Service App Limited | Information & communication | 2021 |
| Tablet Inventories Limited | Information & communication | 2016 |
| TAC Couriers Ltd | Transport & logistics | 2024 |
| Tacam Steel (UK) Limited | Construction | 2013 |
| Tacch Care Limited | Health & social care | 2019 |
| Tackle Brook Ltd | Transport & logistics | 2022 |
| Tacography Tooley Street Ltd | Hospitality | 2017 |
| Tacs Consulting Ltd | Health & social care | 2025 |
| Tacticalbet Consulting Limited | Arts & recreation | 2025 |
| Tacticalbet Payments Ltd | Wholesale & retail | 2025 |
| Tadas Trans Ltd | Transport & logistics | 2017 |
| Tadema Road and Lots Road Freehold Company Limited | Real estate | 2016 |
| Tadiwa Duba Ltd | Health & social care | 2019 |
| Tadso Estates Limited | Real estate | 2025 |
| Taeon Services Limited | Professional & scientific | 2025 |
| TAG Electrical (Northants) Ltd. | Construction | 2012 |
| Tagco Limited | Construction | 2016 |
| Taha Communication Ltd | Other services | 2017 |
| Taha Properties Ltd | Real estate | 2022 |
| TAI Group Technologies Ltd | Information & communication | 2026 |
| Tailer Capital Limited | Professional & scientific | 2021 |
| Tailer Capital Partners LLP | | 2023 |
| Tailor's Lettings Ltd | Households | 2026 |
| Tailored Investments Ltd | Real estate | 2019 |
| Tailored Tango Ltd | Other services | 2025 |
| Tailr Limited | Information & communication | 2024 |
| Taiyecare Ltd | Transport & logistics | 2022 |
| TAJ Comapny Ltd | Real estate | 2022 |
| TAJ International Ltd | Wholesale & retail | 2021 |
| TAJ Livingwell Ltd | Health & social care | 2023 |
| Tajo Group Ltd | Wholesale & retail | 2024 |
| Takaze Ltd | Real estate | 2026 |
| Take 4 Please Limited | Professional & scientific | 2024 |
| Takingthebiz Limited | Education | 2017 |
| Takla Medical Care Ltd | Health & social care | 2014 |
| Takona Ltd | Wholesale & retail | 2026 |
| Takupro Limited | Real estate | 2020 |
| Talan and Co Ltd | Professional & scientific | 2011 |
| Talent 2 Care Ltd | Administrative & support | 2026 |
| Talent Connect Group Ltd | Administrative & support | 2021 |
| Talent Houzz Limited | Real estate | 2019 |
| Talent Nation Ltd | Wholesale & retail | 2024 |
| Talent Network (Northampton) Ltd | Education | 2018 |
| Talented Teams Ltd | Administrative & support | 2017 |
| Talenthub Recruitment Ltd | Administrative & support | 2025 |
| Talentstree Ltd | Public administration | 2020 |
| Tali Store Ltd | Wholesale & retail | 2023 |
| Talkin' Proud Studios Limited | Extraterritorial | 2022 |
| Tallents Limited | Real estate | 1980 |
| Talpa Ltd | Transport & logistics | 2023 |
| Talukdar Assets Limited | Real estate | 2021 |
| TAM Logistics Ltd | Transport & logistics | 2018 |
| Tamagprub Services Ltd | Health & social care | 2024 |
| Tamang Financial and Commercial Services (UK) Limited | Wholesale & retail | 2012 |
| Tamangwa Ltd | Transport & logistics | 2015 |
| Tamanna Properties Limited | Real estate | 2021 |
| Tamarind Food Ltd | Hospitality | 2020 |
| Tamatech Tradings Ltd | Transport & logistics | 2024 |
| Tamiro Cleaning Ltd | Administrative & support | 2019 |
| Tamis Logistics Ltd | Transport & logistics | 2025 |
| Tamsa Consult Limited | Administrative & support | 2021 |
| Tamsa Solutions Ltd | Information & communication | 2016 |
| Tamsitt Limited | Wholesale & retail | 2025 |
| Tamstarz Limited | Information & communication | 2023 |
| Tanahm Limited | Other services | 2017 |
| Tanas Homes Ltd | Real estate | 2025 |
| Tanas Trans Ltd | Transport & logistics | 2025 |
| Tanasally Ltd | Health & social care | 2022 |
| Tanasplumbing Ltd | Construction | 2025 |
| Tand Holdings Limited | Wholesale & retail | 2020 |
| Tandara Consulting Ltd | Professional & scientific | 2018 |
| Tandem Legal Consultancy Limited | Professional & scientific | 2014 |
| Tandler Precision Limited | Manufacturing | 1989 |
| Tandt Medical Services and Logistics Ltd | Wholesale & retail | 2021 |
| Tane Construction Ltd | Construction | 2021 |
| Taner Express Limited | Transport & logistics | 2020 |
| Taner Logistics Ltd | Transport & logistics | 2018 |
| Tangakdhqj Limited | Agriculture & fishing | 2026 |
| Tangerine Red Limited | Manufacturing | 2014 |
| Tango Foxtrot Yankee Ltd | Information & communication | 2026 |
| Tanicraft Ltd | Wholesale & retail | 2025 |
| Tanishrit Limited | Professional & scientific | 2024 |
| Tanjam Limited | Health & social care | 2014 |
| Tankas Support Services Limited | Administrative & support | 2016 |
| Tanma Limited | Health & social care | 2014 |
| Tannerra International Ltd | Wholesale & retail | 2025 |
| Tanning World (Cambridge) Ltd. | Other services | 2009 |
| Tanning World (ELY) Limited | Other services | 2001 |
| Tanqueray Limited | Administrative & support | 2017 |
| Tanya’S Cleaning Ltd | Administrative & support | 2024 |
| Tanzy Estates Property Company Limited | Construction | 2019 |
| TAO Xclusive Limited | Wholesale & retail | 2021 |