| Tilting at Windmills Ltd | Information & communication | 2025 |
| TIM Walkden Financial Planning Ltd | Professional & scientific | 2020 |
| TIM Waring Property Ltd | Professional & scientific | 2022 |
| TIM Winterbottom Design Agency Ltd | Professional & scientific | 2021 |
| Timber Auctions LLP | | 2022 |
| Timber Moon Ltd | Manufacturing | 2023 |
| Time for GOD | Education | 2000 |
| Time OUT Trading Ltd | Wholesale & retail | 2010 |
| Time Right Group Limited | Other services | 2014 |
| Time Right Holdings Limited | Other services | 2014 |
| Time Right Limited | Administrative & support | 1994 |
| Time to Thrive Ltd | Health & social care | 2019 |
| Timeless Heritage Ltd | Wholesale & retail | 2025 |
| Timeless Wellbeing Ltd | Health & social care | 2025 |
| Timen Property Limited | Real estate | 2025 |
| Timespan Properties Limited | Real estate | 1997 |
| Timesz Ltd | Wholesale & retail | 2025 |
| Timezilo Limited | Information & communication | 2020 |
| Timur Lets Ltd | Real estate | 2026 |
| Tinado Care Limited | Health & social care | 2024 |
| Tiny BPM Limited | Information & communication | 2013 |
| Tinybeats Ltd | Health & social care | 2019 |
| TIP Top Landscapes York Limited | Administrative & support | 2023 |
| Tipi Events Yorkshire Ltd | Hospitality | 2021 |
| TIR Y Bont (Bridgend) Management Company Limited | Households | 2021 |
| Tirol Developments Ltd. | Real estate | 1995 |
| Titan Advantage Ltd | Professional & scientific | 2016 |
| Titan Equipment Supplies Limited | Wholesale & retail | 2024 |
| Titan Group Global Ltd | Wholesale & retail | 2026 |
| Titan Resource Management Ltd | Manufacturing | 2014 |
| Titan Retail Sales Limited | Professional & scientific | 2020 |
| Titus Coetzee Properties Limited | Real estate | 2024 |
| Tiwtech Ltd | Information & communication | 2021 |
| Tizzy Lemon Ltd | Information & communication | 2021 |
| TJ Services York Limited | Real estate | 2013 |
| TJ Valve Services Ltd | Professional & scientific | 2025 |
| TJG London Limited | Extraterritorial | 2026 |
| TJH Property Management Limited | Real estate | 2023 |
| TJH Trading Limited | Wholesale & retail | 2019 |
| TJM Autospray Ltd | Wholesale & retail | 2026 |
| TJP Systems Ltd | Professional & scientific | 2022 |
| TK Archaeology Ltd | Professional & scientific | 2024 |
| Tkoy Ltd | Wholesale & retail | 2021 |
| TL Compliance Limited | Professional & scientific | 2016 |
| TL Web Solutions Limited | Professional & scientific | 2003 |
| TLC Services York Ltd | Information & communication | 2023 |
| TLC Smile Ltd | Health & social care | 2024 |
| TLI Property Limited | Real estate | 2025 |
| Tlpm Ltd | Professional & scientific | 2025 |
| TLT Curtainsider Services Limited | Transport & logistics | 2003 |
| TM CAD Ltd | Professional & scientific | 2026 |
| TM HOLDINGS2 Ltd | Real estate | 2023 |
| TM Statistical Consulting Limited | Professional & scientific | 2014 |
| Tmack Ltd. | Hospitality | 2015 |
| TMG Projects Limited | Professional & scientific | 2023 |
| TMK Haulage Ltd | Transport & logistics | 2025 |
| TMO Travel Airport Transfers York Ltd | Transport & logistics | 2025 |
| TMO Travel York Ltd | Transport & logistics | 2024 |
| Tmpc Unlimited | Manufacturing | 2006 |
| TMS Development International Limited | Professional & scientific | 1989 |
| Tmsdi Limited | Professional & scientific | 2000 |
| TMTC1 Limited | Arts & recreation | 2024 |
| TNE Accounting Ltd | Professional & scientific | 2014 |
| TNE Consultants Limited | Professional & scientific | 2021 |
| TNF Research Ltd | Professional & scientific | 2021 |
| TNJ Developments Limited | Construction | 2015 |
| TNM Transport Ltd | Transport & logistics | 2022 |
| Tobin Scaffolding Services Limited | Construction | 1987 |
| Toby H Johnson Limited | Administrative & support | 2013 |
| Tockwith and District Agricultural Society Limited | Other services | 2004 |
| Tockwith Motorsport Limited | Wholesale & retail | 2018 |
| Tockwith Multi-Drive Centre Limited | Arts & recreation | 2014 |
| Tockwith Outdoor Karting Limited | Arts & recreation | 2019 |
| Tockwith Skate Shop Ltd | Wholesale & retail | 2025 |
| Tofalns Limited | Hospitality | 2009 |
| Tofe Photo Ltd | Professional & scientific | 2019 |
| Together People Ltd | Professional & scientific | 2004 |
| Together Through Loss and Change CIC | Education | 2022 |
| Tokyo Way Limited | Hospitality | 2024 |
| Tollerton Stores Limited | Wholesale & retail | 2012 |
| TOM Dean Limited | Professional & scientific | 2023 |
| TOM James Holdings Limited | Financial services | 2023 |
| TOM James Transport Ltd | Transport & logistics | 2007 |
| TOM Portman (UK) Limited | Professional & scientific | 2010 |
| TOM Rhodes & Sons Limited | Construction | 2005 |
| TOM Sessions Acupuncture Ltd | Health & social care | 2023 |
| TOM Sessions Consulting Ltd | Professional & scientific | 2020 |
| TOM Shaw Design Limited | Professional & scientific | 2006 |
| TOM Springett Limited | Manufacturing | 2019 |
| TOM Taylor ATV Limited | Wholesale & retail | 2019 |
| TOM Vaughan Ltd | Information & communication | 2014 |
| Tom's Dairy Limited | Hospitality | 2019 |
| Tomark Electronics Ltd | Wholesale & retail | 2012 |
| Tome and Trove Ltd | Wholesale & retail | 2025 |
| Tomiyt Ltd | Manufacturing | 2025 |
| Tomleck Limited | Professional & scientific | 2006 |
| Tommy Boserup & Co Ltd | Professional & scientific | 2020 |
| Tompkins Roots Ltd | Wholesale & retail | 2020 |
| Tony Neary Butchers Limited | Wholesale & retail | 2006 |
| Tooke & Sons Transport Ltd | Transport & logistics | 2022 |