| Tele-Bank Limited | Administrative & support | 2002 |
| Tele-Products Limited | Manufacturing | 1988 |
| Teleportation Limited | Information & communication | 2011 |
| Tell Media Limited | Information & communication | 2016 |
| Tellan Build Limited | Construction | 2019 |
| Tellan Limited | Information & communication | 2003 |
| Tellan Tech Limited | Information & communication | 2019 |
| TELLY4U Limited | Wholesale & retail | 2008 |
| Telnet Limited | Professional & scientific | 1993 |
| Telo Residential Limited | Real estate | 2017 |
| Telos Physio Ltd | Health & social care | 2024 |
| Telum Partners Limited | Other services | 2024 |
| Temi Ventures Ltd | Real estate | 2025 |
| Tempel Co UK Ltd | Administrative & support | 2009 |
| Templar Experience Limited | Professional & scientific | 2022 |
| Templar Place Holdings Ltd | Financial services | 2025 |
| Temple Aesthetics Yorkshire Ltd | Health & social care | 2026 |
| Temple Business Solutions Limited | Professional & scientific | 1996 |
| Temple Gate (Burgess Hill) Resident Management Co Ltd | Households | 2024 |
| Temple Holdings (York) Limited | Wholesale & retail | 2025 |
| Temple Roberts Ltd | Other services | 2008 |
| Templefields (Consett) Management Company Limited | Real estate | 2025 |
| Templin Propping Systems Ltd | Construction | 2025 |
| Temporary Power Services Limited | Construction | 2010 |
| TEN Ants Productions Limited | Arts & recreation | 2025 |
| TEN Lengths Media Ltd | Professional & scientific | 2023 |
| TEN Tenths Performance Ltd | Professional & scientific | 2019 |
| TEN22 Investments Limited | Financial services | 2022 |
| Tenerife Enterprises Limited | Wholesale & retail | 1991 |
| Tenetlime Limited | Financial services | 2003 |
| Tenfold Trading Ltd | Professional & scientific | 2026 |
| Tenhoursback Limited | Information & communication | 2026 |
| Tenzing Holdings Ltd | Financial services | 2024 |
| Tenzing Software Ltd | Information & communication | 2024 |
| Terabi Ltd | Information & communication | 2008 |
| Tern Global Ltd | Professional & scientific | 2025 |
| Terra Neutra Ltd | Wholesale & retail | 2019 |
| Terraai Ltd | Information & communication | 2022 |
| Terraedonum Ltd | Wholesale & retail | 2024 |
| Terrafertil UK Limited | Wholesale & retail | 2012 |
| Terrasys Limited | Information & communication | 2008 |
| Terravista Ltd | Professional & scientific | 2025 |
| Terrington (York) Limited | Information & communication | 2004 |
| Terrington Data Management Limited | Extraterritorial | 2006 |
| Terrington Hall Trust Limited | Education | 1974 |
| Terrington Stores Limited | Wholesale & retail | 2020 |
| Terrington Village Hall Trading CIC | Hospitality | 2026 |
| Terrys Mews RTM Company Ltd | Real estate | 2016 |
| Test Match Extra.Com Limited | Information & communication | 2009 |
| Test the Future Ltd | Professional & scientific | 2024 |
| Testament Apparel Limited | Wholesale & retail | 2025 |
| Tetgic Consulting Ltd | Information & communication | 2026 |
| Tetronik Limited | Other services | 2020 |
| Teuton (Energetics) Limited | Manufacturing | 2026 |
| Teversal Green Residents Management Company Limited | Households | 2026 |
| TFL Associates LLP | | 2007 |
| TGG Brands Ltd | Wholesale & retail | 2025 |
| TGG Digital Ltd | Professional & scientific | 2026 |
| Tggc Holdings Limited | Real estate | 2026 |
| Tggc Operations Limited | Arts & recreation | 2026 |
| Tggc Walmersley Limited | Arts & recreation | 2026 |
| TH Partners Limited | Health & social care | 2026 |
| Thai Boxing Store (UK) Ltd | Wholesale & retail | 2011 |
| Thai Leisure Group Limited | Hospitality | 2012 |
| Thaikhun Limited | Extraterritorial | 2019 |
| Thallassa Power Systems Ltd | Public administration | 2025 |
| That Place Ltd | Wholesale & retail | 2022 |
| That Tech GUY Ltd | Information & communication | 2025 |
| That's HER Business Limited | Professional & scientific | 2019 |
| Thatcar Ltd | Wholesale & retail | 2019 |
| THE 'H' Group Limited | Administrative & support | 1994 |
| THE 1752 Group C.I.C. | Education | 2017 |
| THE 19TH Hole (Otley) Ltd | Hospitality | 2018 |
| THE 29TH Elephant Ltd | Professional & scientific | 2016 |
| THE 2ND Legion Graphic Novels Limited | Information & communication | 2010 |
| THE 3 Graces Co. Limited | Administrative & support | 1996 |
| THE 68 Club Ltd | Hospitality | 2026 |
| THE 79 Lawrence Street Management Company Limited | Hospitality | 1992 |
| THE a Clean Window Cleaning Limited | Administrative & support | 2011 |
| THE Accounting Room Ltd | Professional & scientific | 2021 |
| THE Acorn Room Ltd | Other services | 2018 |
| THE Adam Bojelian Foundation CIC | Information & communication | 2020 |
| THE Affinity Project - Coaching and Mentoring Ltd | Health & social care | 2025 |
| THE Alarm Monitoring Company Limited | Administrative & support | 2012 |
| THE Alcohol Free Drinks Company Ltd | Wholesale & retail | 2021 |
| THE Alders (Gilwern) Residents Management Company Limited | Households | 2014 |
| THE Allied Air Forces Memorial Limited | Information & communication | 2018 |
| THE Amber Tree Clinic Ltd | Health & social care | 2023 |
| THE Amenity Forum | Other services | 2016 |
| THE Ampleforth Abbey Trustees Limited | Other services | 1945 |
| THE Angry Yorkshire MAN Limited | Hospitality | 2019 |
| THE Antiques Centre York Limited | Wholesale & retail | 2017 |
| THE Antler and Vine Ltd | Hospitality | 2026 |
| THE Applied Research Centre in the Humanities and Press Ltd | Information & communication | 2014 |
| THE Aquaspirit (UK) Ltd | Real estate | 2009 |
| THE Arboretum Trust Trading Company Limited | Hospitality | 2009 |
| THE Archetype Store Ltd | Wholesale & retail | 2025 |
| THE Arkvet Practice Limited | Professional & scientific | 2011 |
| THE Arlo Group UK Limited | Financial services | 2001 |
| THE Arndale Management Company Limited | Households | 2003 |