| T & C Property Ltd | Real estate | 2016 |
| T & J Tasty Flavours Ltd | Hospitality | 2017 |
| T & MK Entertainment Limited | Hospitality | 2016 |
| T & R S Engineering Ltd | Professional & scientific | 1999 |
| T a Cowan Ltd | Construction | 2014 |
| T a Holdings Limited | Construction | 2023 |
| T C Rentals 2025 Limited | Real estate | 2025 |
| T G Eurosport Exhausts (Yorkshire) Limited | Wholesale & retail | 2019 |
| T Group Developments Ltd | Real estate | 2026 |
| T Hill & R Wright LLP | | 2023 |
| T I Cleaning Services Ltd | Administrative & support | 2025 |
| T I Mansell Consulting Limited | Professional & scientific | 2011 |
| T J Ceramics Limited | Construction | 2007 |
| T K L Earthworks (Yorkshire) Ltd | Construction | 2015 |
| T L B Properties Limited | Real estate | 1999 |
| T M Consultancy Ltd | Professional & scientific | 2021 |
| T M Events Limited | Other services | 2011 |
| T M Mini Market Limited | Wholesale & retail | 2025 |
| T M Taekwondo Ltd | Other services | 2022 |
| T Minshaw Ltd | Hospitality | 2021 |
| T Notts J Limited | Wholesale & retail | 2026 |
| T Scott Legal Consultancy Ltd | Professional & scientific | 2025 |
| T Watson Suppliers Limited | Wholesale & retail | 2011 |
| T Williams Joinery Limited | Construction | 2008 |
| T Y Caravans Ltd | Other services | 2016 |
| T Y Motor Homes Ltd | Other services | 2021 |
| T&A Aggregates Limited | Transport & logistics | 2024 |
| T&H Food Services Ltd | Professional & scientific | 2023 |
| T&L Steelworks Ltd | Construction | 2019 |
| T&M Leisure Reading Ltd | Hospitality | 2015 |
| T&R Digital Services Ltd | Information & communication | 2026 |
| T. Clark (Quarries) Limited | Manufacturing | 1978 |
| T. J. Snippers Limited | Other services | 2003 |
| T. Quality Limited | Wholesale & retail | 1947 |
| T. Sanders T.V. Rentals Limited | Administrative & support | 1978 |
| T. T. Proturf Limited | Agriculture & fishing | 1997 |
| T.H Civils & Ground Works Ltd | Construction | 2023 |
| T.K.Aragon.Transport Ltd | Transport & logistics | 2023 |
| T.L.H. Fabrications Limited | Manufacturing | 2006 |
| T.U.L. Panel Limited | Financial services | 2024 |
| T.W.E. (Holdings) Limited | Financial services | 2020 |
| T1 Installations Limited | Construction | 2015 |
| T1 Property Development Limited | Real estate | 2020 |
| T8 Joinery Ltd | Manufacturing | 2023 |
| TA Homes Ltd | Real estate | 2019 |
| TA Hospitality Management Ltd | Hospitality | 2024 |
| TA Trends Ltd | Wholesale & retail | 2026 |
| TA19 Property Ltd | Real estate | 2025 |
| Taavi Poder Ltd | Construction | 2025 |
| Taaz Tandoori Limited | Hospitality | 2014 |
| Tabeka UK Ltd | Wholesale & retail | 2025 |
| Tabi Digital Ltd | Information & communication | 2026 |
| Tabletech Medical Ltd | Wholesale & retail | 2026 |
| Tabor Gomes Properties Ltd | Construction | 2024 |
| Tabsways Ltd | Transport & logistics | 2022 |
| Tackled UP Ltd | Wholesale & retail | 2020 |
| Tacs Solutions Limited | Extraterritorial | 2011 |
| Taditapu Limited | Health & social care | 2014 |
| Tafaj Limited | Construction | 2017 |
| TAG Autosport Limited | Wholesale & retail | 2017 |
| TAG Environmental Limited | Extraterritorial | 2014 |
| TAG Industries Limited | Water & waste | 2013 |
| TAG Property Developments Limited | Construction | 2018 |
| Tails of Reggie Ltd | Real estate | 2024 |
| Taincustoms Limited | Wholesale & retail | 2025 |
| Tajali Limited | Financial services | 2020 |
| Taka Sushi Ltd | Hospitality | 2022 |
| Take the Reins CIC | Education | 2023 |
| Taksim Grill House Ltd | Hospitality | 2025 |
| Talah Limited | Health & social care | 2008 |
| Talbot Business Solutions Limited | Information & communication | 2011 |
| Talbot Finance (Hilton) Limited | Financial services | 2025 |
| Talegate Theatre Productions Limited | Arts & recreation | 2017 |
| Talenscio Limited | Administrative & support | 2013 |
| Talent Hire Limited | Administrative & support | 2024 |
| Talent Hire Ventures Ltd | Administrative & support | 2025 |
| Talent Resource Services Ltd | Administrative & support | 2025 |
| Talent Resource Solutions Ltd | Administrative & support | 2025 |
| Talentbridge Resourcing Ltd | Extraterritorial | 2025 |
| Talk to Media Limited | Professional & scientific | 2004 |
| Tall Delivery Ltd | Transport & logistics | 2021 |
| Tall Tree Yoga and Pilates Studio Limited | Arts & recreation | 2014 |
| TAM Drive Ltd | Transport & logistics | 2018 |
| TAM Wholesale Ltd | Wholesale & retail | 2021 |
| Tamarind 2008 Ltd | Financial services | 2020 |
| Tamaris (RAM) Limited | Health & social care | 1998 |
| Tambourine Hands Ltd | Arts & recreation | 2021 |
| Tammy Sales Ltd | Wholesale & retail | 2024 |
| Tammysat (Edlington) Ltd | Wholesale & retail | 2015 |
| Tammytech Ltd | Wholesale & retail | 2025 |
| Tammyyomm Trinity Company Ltd | Professional & scientific | 2026 |
| Tams Consulting UK Limited | Professional & scientific | 2012 |
| TAN King Ltd | Other services | 2021 |
| TAN King Rossington Ltd | Other services | 2023 |
| TAN King Skellow Ltd | Other services | 2024 |
| Tana Recycling Machinery (UK) Limited | Wholesale & retail | 2016 |
| Tandoori (RJ) Limited | Hospitality | 2022 |
| Tandoori Flame Doncaster Ltd | Hospitality | 2025 |
| Tangarine Ltd | Wholesale & retail | 2020 |
| Tangerine Policies Ltd | Construction | 2018 |