| T Whelan Electrical Limited | Construction | 2017 |
| T&C Apply Building Contractors Ltd | Construction | 2024 |
| T&D Shutter Services Limited | Manufacturing | 2016 |
| T&G Auto Spares Limited | Wholesale & retail | 2004 |
| T&J Kenny Limited | Wholesale & retail | 2026 |
| T&K Properties Ltd | Real estate | 2018 |
| T&M Contractor Leeds Limited | Administrative & support | 2015 |
| T&M Kitchen Ltd | Hospitality | 2024 |
| T&M Properties Leeds Limited | Real estate | 2026 |
| T&M Reuse Yorkshire Limited | Water & waste | 2013 |
| T&N Materials Research Limited | Professional & scientific | 1956 |
| T&N Shelf Four Limited | Professional & scientific | 1968 |
| T&N Shelf Three Limited | Professional & scientific | 1954 |
| T&S Business Solutions Ltd | Information & communication | 2023 |
| T&S Rental Group Limited | Real estate | 2023 |
| T&T Haulage Ltd | Transport & logistics | 2025 |
| T'North Ltd | Wholesale & retail | 2026 |
| T'S Locs Ltd | Other services | 2025 |
| T,W,Renovation Ltd | Construction | 2025 |
| T-1 Today UK | Education | 2015 |
| T-Lek Electrical Ltd | Construction | 2023 |
| T-Lek Property Ltd | Real estate | 2026 |
| T-Post Cafe Limited | Hospitality | 2022 |
| T-Uppals Limited | Hospitality | 2017 |
| T. Guise Ltd | Hospitality | 2017 |
| T. H. M. Fung Limited | Health & social care | 2023 |
| T. Hayselden (Barnsley) Limited | Wholesale & retail | 1961 |
| T. Hayselden (Doncaster) Limited | Wholesale & retail | 1959 |
| T. Wright & SON (Holdings) Limited | Professional & scientific | 1948 |
| T.B. (Halifax) Limited | Wholesale & retail | 1985 |
| T.C.M Properties (Leeds) Limited | Households | 2026 |
| T.D.R (Temporary Dental Recruitment) Ltd | Administrative & support | 2021 |
| T.D.Whitfield & Sons Limited | Manufacturing | 1959 |
| T.E.P. Machinery Movement Limited | Construction | 1978 |
| T.F. & J.H. Braime (Holdings) P.L.C. | Extraterritorial | 2019 |
| T.Herbert Kaye's Estates Limited | Extraterritorial | 1927 |
| T.I.E Properties Ltd | Real estate | 2024 |
| T.I.S.Cumbria Limited | Manufacturing | 1999 |
| T.K. GAS Limited | Energy | 2016 |
| T.M Primus Properties Ltd | Construction | 2025 |
| T.M West Trading Ltd | Construction | 2023 |
| T.M. West Plumbing Services Limited | Construction | 1987 |
| T.M.C. (Marine Consultants) Limited | Professional & scientific | 1979 |
| T.R. Legal Services Limited | Professional & scientific | 2018 |
| T.R.A.D. Couriers Ltd | Transport & logistics | 2024 |
| T.S. Lawton & Sons Limited | Manufacturing | 1947 |
| T.T Leeds Services Ltd | Other services | 2019 |
| T.W. Bailey (Merchants) Limited | Professional & scientific | 1967 |
| T.W.H (Doncaster) Limited | Hospitality | 2019 |
| T.Whelan Properties Limited | Real estate | 2020 |
| T.Williams Investments Ltd | Extraterritorial | 2024 |
| T1DE.CO Limited | Information & communication | 2024 |
| T2 Specials Limited | Wholesale & retail | 2013 |
| T29MARKETING Limited | Other services | 2025 |
| T3 Fitness (Leeds) Ltd | Arts & recreation | 2024 |
| T3 NEV Ltd | Real estate | 2020 |
| T3C Group Ltd | Information & communication | 2024 |
| T4LC Ltd | Information & communication | 2025 |
| T4MATION Ltd | Wholesale & retail | 2020 |
| T5 Digital Consulting Ltd | Professional & scientific | 2020 |
| T6 Group Limited | Real estate | 2021 |
| T7 Group Ltd | Real estate | 2021 |
| TA Allum Education Centre Ltd | Education | 2025 |
| TA Sprinklers Ltd | Construction | 2021 |
| Ta-Da Enterprise Limited | Wholesale & retail | 2020 |
| Ta-Dah Branding Ltd | Other services | 2024 |
| Taag Persian Ltd | Hospitality | 2019 |
| TAB Group Limited | Financial services | 2020 |
| TAB38A Ltd | Hospitality | 2026 |
| Taba Productions Limited | Arts & recreation | 2016 |
| Tabanka Social Bar and Venue Ltd | Hospitality | 2026 |
| Tabaro Logistic Ltd | Transport & logistics | 2023 |
| Taberna DA Belle Ltd | Hospitality | 2018 |
| Tabinda Ltd | Wholesale & retail | 2024 |
| Table Source Ltd | Extraterritorial | 2016 |
| Tabletop Sports Ltd | Other services | 2026 |
| Tabology Ltd | Information & communication | 2010 |
| Tabor Consultancy Ltd | Professional & scientific | 2010 |
| Tabrez Consultants Limited | Administrative & support | 2012 |
| Tabrizi Ltd | Hospitality | 2021 |
| Tacchions Pizza Ltd | Hospitality | 2023 |
| Tack Projects Ltd | Hospitality | 2016 |
| Tack Solutions Limited | Hospitality | 2014 |
| Taclife Ltd | Manufacturing | 2023 |
| Taco Bite Mexican Ltd | Hospitality | 2026 |
| TAD Entertainment Limited | Information & communication | 2023 |
| TAD Retail Management Ltd | Wholesale & retail | 2026 |
| Tadatuft Ltd | Wholesale & retail | 2022 |
| Tadcaster & Selby Rural PCN Ltd | Health & social care | 2024 |
| Tadcaster Timber Ltd | Administrative & support | 2024 |
| Tadcaster Timber Products Limited | Construction | 2020 |
| Taduba Ltd | Real estate | 2025 |
| Taffie Tots Limited | Wholesale & retail | 2022 |
| TAG Quality Healthcare Limited | Health & social care | 2019 |
| Tagh Limited | Hospitality | 2016 |
| Tagnqi Consulting Ltd | Information & communication | 2026 |
| Tags Investments | Financial services | 2014 |
| Tags Land | Financial services | 2017 |
| Tagtiling Limited | Construction | 2024 |
| Tahliajane Limited | Wholesale & retail | 2020 |