| Tax Slayer Ltd | Extraterritorial | 2012 |
| TAX1 Ltd | Professional & scientific | 2020 |
| Taxtrackr Limited | Information & communication | 2024 |
| Taylor Fawcett Limited | Professional & scientific | 2011 |
| Taylor Hamilton Limited | Professional & scientific | 2006 |
| Taylor Leighton Limited | Extraterritorial | 2025 |
| Taylor Made Sales & Revenue Solutions Limited | Professional & scientific | 2011 |
| Taylor-Smith Hospitality Ltd | Hospitality | 2020 |
| TC Plumbing Heating and GAS Limited | Construction | 2021 |
| TC Special Projects Limited | Professional & scientific | 2024 |
| TCA 32 Limited | Information & communication | 1996 |
| TCB Media Partnerships Ltd | Manufacturing | 2016 |
| TCC HG Ltd | Hospitality | 2025 |
| TDT Property Limited | Real estate | 2021 |
| Teakwood Developments Limited | Construction | 2013 |
| Teakwood Estates Limited | Construction | 2010 |
| Teakwood Investments Limited | Professional & scientific | 2014 |
| Teal Property Consultancy Limited | Real estate | 2020 |
| Team America Ltd | Extraterritorial | 2012 |
| Team Essex Limited | Extraterritorial | 2012 |
| Team Gloucestershire Limited | Extraterritorial | 2012 |
| Team JLR Limited | Arts & recreation | 1993 |
| Team Lancashire Limited | Extraterritorial | 2012 |
| Team Leicestershire Limited | Extraterritorial | 2012 |
| Team Partnership Limited | Financial services | 2016 |
| Team Pennine Limited | Transport & logistics | 2021 |
| Team Sussex Limited | Extraterritorial | 2012 |
| Team Wessex Limited | Extraterritorial | 2013 |
| Team Worcestershire Limited | Extraterritorial | 2012 |
| Tearmann Ltd | Administrative & support | 2022 |
| Teather Sustain Ltd | Professional & scientific | 2020 |
| Teblal LLP | | 2021 |
| TEC Products Limited | Wholesale & retail | 2018 |
| Techbuyer Group Holdings Limited | Wholesale & retail | 2016 |
| Techbuyer Limited | Information & communication | 2005 |
| Techbuyer Services Limited | Information & communication | 2020 |
| Techbuyer Trustees Limited | Administrative & support | 2022 |
| Techhaven Solutions Limited | Wholesale & retail | 2026 |
| Techilla Ltd | Information & communication | 2022 |
| Technical Installations Limited | Information & communication | 2022 |
| Technology Products Limited | Financial services | 2005 |
| Technology Products Solutions Limited | Information & communication | 2004 |
| Techpath Aero Ltd | Education | 2025 |
| Teecem Ltd | Mining & quarrying | 2015 |
| Tefl Fullcircle Holdings Limited | Information & communication | 2024 |
| Tefl Fullcircle Ltd | Education | 2015 |
| TEK4U Ltd | Wholesale & retail | 2025 |
| Tekfirst Limited | Information & communication | 2004 |
| Teknord Limited | Manufacturing | 1999 |
| Telic Point Financial Consultancy Limited | Extraterritorial | 2026 |
| Telltale Media Ltd. | Professional & scientific | 2013 |
| Templegate Limited | Extraterritorial | 2026 |
| Tenneco Automotive UK Limited | Wholesale & retail | 1989 |
| Tenneco Management (Europe) Limited | Financial services | 1994 |
| TEO Productions Limited | Information & communication | 2026 |
| Termconcept Property Management Limited | Households | 1991 |
| Terry Story Ltd | Wholesale & retail | 2026 |
| Tessa Herman Consultancy Limited | Professional & scientific | 2012 |
| Test & Measurement Hire Group Limited | Extraterritorial | 2013 |
| Test & Measurement Hire Limited | Extraterritorial | 2005 |
| TET Bidco Limited | Financial services | 2020 |
| TET Midco Limited | Financial services | 2020 |
| Teteshi Atelier Ltd | Other services | 2026 |
| Tetley's Electrical Ltd | Construction | 2015 |
| Tetleys Renewable Technologies Limited | Construction | 2024 |
| Tetlow Consulting Ltd | Wholesale & retail | 2019 |
| Tetracourt Limited | Households | 1991 |
| TEX MEX Ltd | Extraterritorial | 2012 |
| Texet Ltd | Extraterritorial | 2013 |
| Texpark Consultancy Limited | Real estate | 2010 |
| Text ME Ltd | Extraterritorial | 2012 |
| Tfcm Leasing Limited | Administrative & support | 2019 |
| TFI Property Limited | Real estate | 2025 |
| TG1 Land Limited | Real estate | 2018 |
| TG2 Land Limited | Real estate | 2019 |
| TG3 Land Limited | Real estate | 2019 |
| TGH Capital Limited | Professional & scientific | 2014 |
| TGH Enterprise Limited | Professional & scientific | 2014 |
| TGH Property (Grimsby) Limited | Real estate | 2017 |
| TGH Property Limited | Construction | 2014 |
| TH Photography Limited | Professional & scientific | 2007 |
| THA1 Ltd | Extraterritorial | 2020 |
| Thai Siam Relax Therapy Ltd | Other services | 2022 |
| Thai Tonic Limited | Extraterritorial | 2024 |
| Thain Finance (Harrogate) Limited | Professional & scientific | 2019 |
| Thames Flow Plumbing Limited | Construction | 2025 |
| Thameside Aesthetics Limited | Health & social care | 2025 |
| Thankfully Healthy Ltd | Health & social care | 2020 |
| Thats HOW WE Roll Harrogate Ltd | Hospitality | 2025 |
| Thcp Ltd | Construction | 2025 |
| THE a P & G Limited Partnership | | 2003 |
| THE Academy (Harrogate) Limited | Hospitality | 1994 |
| THE Achd Hive Ltd | Health & social care | 2024 |
| THE Adhd Collective Ltd | Health & social care | 2022 |
| THE Advisory ND Ltd | Health & social care | 2023 |
| THE Afghan Kitchen Yorkshire Ltd | Hospitality | 2024 |
| THE Alliance Group Services Ltd | Administrative & support | 2020 |
| THE Angels Events Limited | Hospitality | 2003 |
| THE AP & G General Partner Limited | Professional & scientific | 2003 |
| THE Artful Pour International Ltd | Wholesale & retail | 2020 |