| T S Bridges Ltd | Administrative & support | 2020 |
| T S S Travel Ltd | Transport & logistics | 2025 |
| T W Friends Ltd | Administrative & support | 2016 |
| T W W Realisations Limited | Wholesale & retail | 1954 |
| T W Ward Industrial Boilers Limited | Manufacturing | 1995 |
| T Z Estates Ltd | Real estate | 2022 |
| T&C Williams Builders (Holdings) Ltd | Extraterritorial | 2021 |
| T&D Salon Limited | Other services | 2025 |
| T&G Foods Ltd | Hospitality | 2026 |
| T&G Leisure Ltd | Hospitality | 2026 |
| T&L Enterprise Ltd | Administrative & support | 2019 |
| T&M Communications Limited | Wholesale & retail | 2021 |
| T&R Trade Cars Ltd | Wholesale & retail | 2020 |
| T&S Edwards Medical Limited | Health & social care | 2019 |
| T&T Business Ltd | Hospitality | 2023 |
| T&T Car Sales Ltd | Wholesale & retail | 2018 |
| T'S Bagz Limited | Wholesale & retail | 2023 |
| T-Dentus Oral Health Care Limited | Other services | 2010 |
| T. Fernandes Ltd | Arts & recreation | 1987 |
| T. Garnett (Builders) Limited | Construction | 1984 |
| T. Hill Associates Ltd | Financial services | 2003 |
| T. T. a. Developments Limited | Construction | 2021 |
| T.A.N Group Limited | Other services | 2018 |
| T.B.F. Systems Limited | Agriculture & fishing | 2006 |
| T.D. Barker Construction Ltd | Construction | 2010 |
| T.E. Evans and SON Limited | Wholesale & retail | 1973 |
| T.F. & J.M. Holmes Limited | Administrative & support | 2003 |
| T.G.N. Construction (Yorkshire) Limited | Construction | 1975 |
| T.H.I.S. (UK) Limited | Information & communication | 2012 |
| T.J. (London) Limited | Other services | 1988 |
| T.J. Elsdon Construction Limited | Construction | 1995 |
| T.K Developement Company Sheffield Ltd | Construction | 2025 |
| T.M.T Shop Fitting Ltd | Construction | 2022 |
| T.O.C Electrical Ltd | Construction | 2024 |
| T.P. Smith and Associates LLP | | 2017 |
| T.R Tooling & Machinery Limited | Wholesale & retail | 2016 |
| T.R. Drivers Club Limited | Other services | 1986 |
| T.Rhodes (Structural Engineering Draughting Services) Limited | Professional & scientific | 1992 |
| T.S.O. Delivery Services 2006 Ltd | Transport & logistics | 2025 |
| T.Severn (Fibre Glass Products) Limited | Manufacturing | 1983 |
| T.Trendy.Uk Limited | Wholesale & retail | 2023 |
| T.W Bespoke Lansdscaping Ltd | Administrative & support | 2025 |
| T.W. Ward C.N.C. Machinery Limited | Manufacturing | 1983 |
| T.W. Ward C.N.C. Machinery Midlands and South Limited | Extraterritorial | 1953 |
| T22 Holdings Ltd | Professional & scientific | 2025 |
| T22 Network Partners Ltd | Financial services | 2024 |
| T22 Property Partners Ltd | Real estate | 2024 |
| T33 Gaming Ltd | Hospitality | 2020 |
| T33 Transport Ltd | Transport & logistics | 2016 |
| T3K Ltd | Extraterritorial | 2011 |
| T4 SFD Ltd | Wholesale & retail | 2023 |
| T40 - Trading Ltd | Wholesale & retail | 2025 |
| TA Auto Repairs & Service Centre Ltd | Wholesale & retail | 2025 |
| TA Very Much Ltd | Hospitality | 2024 |
| Tabby Teas Limited | Hospitality | 2026 |
| Tabel Maintenance and Renovation Ltd | Real estate | 2024 |
| Tabrizli Limited | Hospitality | 2019 |
| Tabsouthtechnologies Limited | Information & communication | 2025 |
| Tabula Analytics Limited | Information & communication | 2025 |
| Tacazzi Property Holdings Ltd | Real estate | 2023 |
| Tack & Tailor Ltd | Wholesale & retail | 2020 |
| Taco MEX Mexican Chef Ltd | Hospitality | 2019 |
| Taco MEX UK Ltd | Hospitality | 2022 |
| Tactical Tech Ltd | Wholesale & retail | 2023 |
| TAD Consultants Limited | Information & communication | 2016 |
| TAE Power Engineering Ltd | Wholesale & retail | 2022 |
| Taff Corporation Ltd | Wholesale & retail | 2010 |
| Taftin Solutions Limited | Health & social care | 2014 |
| TAG Research Limited | Professional & scientific | 2009 |
| TAG Site Services (Northern) Ltd | Professional & scientific | 2011 |
| Tags Training Ltd | Education | 2022 |
| Taheri Family Properties Ltd | Real estate | 2026 |
| Tahini Manufacturing Limited | Manufacturing | 2025 |
| TAI42 Ventures Ltd | Professional & scientific | 2025 |
| Taid Ltd | Health & social care | 2023 |
| Taidot Investments Limited | Real estate | 2019 |
| Tailor Trixie Ltd | Wholesale & retail | 2026 |
| Tailored Education Solutions Limited | Education | 2024 |
| Tailored Implant Clinic Limited | Health & social care | 2015 |
| Tailored Lifetime Mortgages Ltd | Financial services | 2017 |
| Tailored Projects Limited | Construction | 2016 |
| Taiposproperty Ltd | Households | 2025 |
| TAK Architects Ltd | Professional & scientific | 2026 |
| Takdir Eatery Ltd | Hospitality | 2026 |
| Take Control Therapies Ltd | Health & social care | 2019 |
| Take Flight Publishing Ltd | Information & communication | 2022 |
| Takeasy Limited | Information & communication | 2026 |
| Taken RRF Limited | Administrative & support | 2019 |
| Takhar Hegemony Limited | Professional & scientific | 2024 |
| TAL Pharma and Chemicals Limited | Manufacturing | 2011 |
| Talay Investment Ltd | Real estate | 2025 |
| Taldah Computers Limited | Information & communication | 2002 |
| Talent Cloud Limited | Administrative & support | 2018 |
| Talent Hub HQ Ltd | Administrative & support | 2023 |
| Talent on View Ltd | Information & communication | 2020 |
| Talent Professionals Recruitment Services Limited | Administrative & support | 2012 |
| Talent Study Centre Ltd | Education | 2023 |
| Talentora Private Limited | Administrative & support | 2025 |
| Taleryn Limited | Information & communication | 2025 |
| Tales by Jeni Ltd | Wholesale & retail | 2024 |