| TAW One Ltd | Information & communication | 2026 |
| Taxus Limited | Agriculture & fishing | 1997 |
| Taxwatch | Information & communication | 2018 |
| TAY Escape Ltd | Construction | 2016 |
| Tayborough Limited | Financial services | 2000 |
| Taylor Bridges Consultancy Ltd | Education | 2012 |
| Taylor Brooke Holdings Ltd | Real estate | 2025 |
| Taylor Garnet Ltd | Real estate | 2023 |
| Taylor Lets Limited | Real estate | 2022 |
| Taylor Shaw Financial Limited | Real estate | 2004 |
| Taylor'D Vending Ltd | Wholesale & retail | 2019 |
| Taylor-Made Accountancy Ltd | Professional & scientific | 2021 |
| Taylor-Made Technology Ltd | Information & communication | 2022 |
| Taylored-Agri Ltd | Agriculture & fishing | 2022 |
| Taylormade Training & Development Ltd | Professional & scientific | 2026 |
| Taylors Jewellers (York) Ltd | Other services | 2025 |
| Taylortex Limited | Manufacturing | 1935 |
| Tayrol Limited | Manufacturing | 1988 |
| Taywell Stays Limited | Hospitality | 2026 |
| TB Business Consultancy Ltd | Professional & scientific | 2018 |
| TB Holdco Limited | Extraterritorial | 2017 |
| TB Response Handling Limited | Administrative & support | 2019 |
| TBD Advisory Limited | Professional & scientific | 2026 |
| TBK Dent Ltd | Health & social care | 2026 |
| TC Auto Services York Ltd | Wholesale & retail | 2025 |
| TC Farm Services Limited | Agriculture & fishing | 2002 |
| TC Paving & Groundworks Ltd | Administrative & support | 2020 |
| TC Property Renovation & Maintenance Ltd | Construction | 2017 |
| TC Watson Ltd | Information & communication | 2015 |
| Tcdr Developments Limited | Real estate | 2010 |
| Tceh (2011) Limited | Extraterritorial | 2011 |
| TCG Automotive Ltd | Wholesale & retail | 2019 |
| TCL Brickwork Ltd | Construction | 2016 |
| TCL Capital Holdings Ltd | Financial services | 2021 |
| Tcsc Engineering Ltd | Professional & scientific | 2022 |
| TD Mitchell Consulting Ltd | Professional & scientific | 2017 |
| TDC Architects Ltd | Professional & scientific | 2016 |
| TDC Holdings Limited | Financial services | 2019 |
| TDC Trading Limited | Other services | 2009 |
| TDI Fleet Solutions Ltd | Wholesale & retail | 2025 |
| TDS Welding & Fabrication Limited | Manufacturing | 2025 |
| TDW Electrical Services Limited | Construction | 2024 |
| Tea & Empathy Limited | Administrative & support | 2012 |
| Tea & Marketing Ltd | Professional & scientific | 2022 |
| Tea Powered Ventures Limited | Information & communication | 2025 |
| Teach 24 Yorkshire Ltd | Education | 2015 |
| Teach IT Forward Ltd | Information & communication | 2021 |
| Teach ME Happy Ltd | Education | 2022 |
| Teacher Success Platform Limited | Education | 2023 |
| Teajuanas Cafe Ltd | Hospitality | 2020 |
| Teakwood Partners Limited | Extraterritorial | 2016 |
| Teal Commercial Services Ltd | Professional & scientific | 2019 |
| Teal Street Limited | Professional & scientific | 2016 |
| Teale and Sons Timber Ltd | Wholesale & retail | 2024 |
| Team G Bathrooms and WET Rooms Ltd | Construction | 2026 |
| Team HQ York Limited | Arts & recreation | 2025 |
| Team Player Security Ltd | Administrative & support | 2012 |
| Team Roebuck UK Ltd | Information & communication | 2017 |
| Team Skera Ltd | Information & communication | 2022 |
| Team Sport and Play Ltd | Arts & recreation | 2018 |
| Team-D Property Services Ltd | Households | 2012 |
| Teambadass Weightlifting Ltd | Education | 2025 |
| Teapot Records Limited | Information & communication | 2021 |
| Teare Financial Solutions Limited | Financial services | 2018 |
| Teasdale Place (Carlisle) Management Company Limited | Households | 2014 |
| Teaso Property Services Ltd | Real estate | 2026 |
| TEC Sporting Limited | Agriculture & fishing | 2021 |
| Teca Limited | Professional & scientific | 2015 |
| Tech and JAM Limited | Information & communication | 2017 |
| Tech Tyres Limited | Wholesale & retail | 2002 |
| TECH-27 Holdings Ltd | Professional & scientific | 2020 |
| Technauts Consultancy Ltd | Professional & scientific | 2018 |
| Technical ARC Holdings Ltd | Administrative & support | 2021 |
| Technical Car Services Limited | Wholesale & retail | 1983 |
| Technical Services and Supplies Limited | Manufacturing | 1987 |
| Technical Welding Services Limited | Manufacturing | 2008 |
| Technology Dynamics Limited | Professional & scientific | 2012 |
| Technology in Play Ltd | Professional & scientific | 2017 |
| Technolysys Ltd | Information & communication | 2019 |
| Technosolutions Ltd | Information & communication | 2021 |
| Technotherm Limited | Wholesale & retail | 1991 |
| Techscend Ltd | Wholesale & retail | 2024 |
| Techstyle-Europe Ltd | Manufacturing | 2006 |
| Techteamhub Ltd | Education | 2021 |
| Tectonknow Ltd | Professional & scientific | 2020 |
| TEE Total Apparel Ltd | Wholesale & retail | 2025 |
| Teebox Golf Management Ltd | Arts & recreation | 2019 |
| Teek Group Limited | Professional & scientific | 2026 |
| Teem International Limited | Extraterritorial | 2023 |
| Teemo Labs Ltd | Information & communication | 2026 |
| Teestephen Ltd | Health & social care | 2016 |
| TEF Gauging Ltd. | Professional & scientific | 2017 |
| TEG Horticulture Ltd | Administrative & support | 2011 |
| Teixeira Associate Services Limited | Health & social care | 2020 |
| Teke York Limited | Hospitality | 2016 |
| Tekkers York Ltd | Arts & recreation | 2023 |
| Teksupport Limited | Information & communication | 2011 |
| Tekton Building and Joinery Limited | Construction | 2024 |
| Tela Properties Limited | Extraterritorial | 1959 |
| Teldent Limited | Other services | 2001 |