| TIB Fixers Ltd | Construction | 2016 |
| Tiberian Consulting Limited | Information & communication | 2016 |
| Tiberian Developers Limited | Information & communication | 2012 |
| Tickner Holding Co Ltd | Financial services | 2025 |
| Ticu Trans Ltd | Administrative & support | 2024 |
| Tida Technic Ltd | Wholesale & retail | 2018 |
| Tidyup Crew Ltd | Administrative & support | 2026 |
| Tiger Flooring Commercials Limited | Construction | 2024 |
| Tigersi Technologies Limited | Information & communication | 2012 |
| Tikbox Limited | Information & communication | 2012 |
| Tikka Guys Ltd | Hospitality | 2026 |
| Tile Icon Ltd | Wholesale & retail | 2020 |
| Tilemotor Limited | Construction | 2000 |
| Tiles With Style Ltd | Construction | 2019 |
| Tilford Holdings Limited | Financial services | 2017 |
| Tilford Investments Limited | Administrative & support | 2019 |
| Till Systems Europe Limited | Manufacturing | 2023 |
| Till Systems UK Limited | Wholesale & retail | 2020 |
| Tiltorea Limited | Information & communication | 2019 |
| Timber LOG Build Holdings Ltd | Financial services | 2018 |
| Timberfusion Limited | Construction | 2009 |
| Timberlake Health & Safety Consultants Limited | Information & communication | 2025 |
| Timberlogbuild Limited | Manufacturing | 2009 |
| Timd Electronic Design Limited | Professional & scientific | 2018 |
| Time Shakers Limited | Professional & scientific | 2009 |
| Time to Sleep Sleep Practitioners Ltd | Health & social care | 2026 |
| Timekeeper Video Filming Limited | Professional & scientific | 1999 |
| Timepledge Limited | Education | 2015 |
| Timmy's Autos Ltd | Wholesale & retail | 2023 |
| Timoney Associates Ltd | Administrative & support | 2015 |
| TIN Services Limited | Wholesale & retail | 2018 |
| Tinker Trading Limited | Other services | 2019 |
| Tint Graphics Limited | Professional & scientific | 2021 |
| Tiny Hunter Limited | Information & communication | 2014 |
| Tipa EV Ltd | Professional & scientific | 2024 |
| Tipireddy Private Ltd | Real estate | 2022 |
| Tironmax Limited | Professional & scientific | 2010 |
| Tissue Science Laboratories Limited | Professional & scientific | 1999 |
| Titan Care Holdings Ltd | Financial services | 2019 |
| Titan Care Services Ltd | Professional & scientific | 2019 |
| Titan Exports (UK) Limited | Wholesale & retail | 2014 |
| Titan Precision Milling & Sintering Ltd | Manufacturing | 2026 |
| Titanic Logistic 31 Ltd | Transport & logistics | 2023 |
| Titans Holdings Limited | Administrative & support | 2025 |
| Tithe Holdings Limited | Financial services | 2024 |
| Tithe Walk Management Ltd | Real estate | 2021 |
| TJ Therapy Limited | Other services | 2024 |
| Tj&Ak Limited | Real estate | 2019 |
| TJG Property Group Limited | Real estate | 2024 |
| TJI Properties Limited | Real estate | 2015 |
| TJL Home Creators Limited | Real estate | 2025 |
| TJM Financial Services Ltd | Financial services | 2014 |
| TJM Fire and Electrical Limited | Manufacturing | 2025 |
| TJW Social Work Ltd | Health & social care | 2022 |
| TJX Austria Management Limited | Financial services | 2013 |
| TJX Europe Buying (Deutschland) Limited | Wholesale & retail | 1995 |
| TJX Europe Buying (Polska) Limited | Administrative & support | 2011 |
| TJX Europe Buying Group Limited | Administrative & support | 2009 |
| TJX Europe Buying Limited | Administrative & support | 2011 |
| TJX Europe Limited | Wholesale & retail | 1995 |
| TJX International Holding Limited | Financial services | 2025 |
| TJX UK | Wholesale & retail | 1995 |
| TJX UK Property Limited | Real estate | 2015 |
| TK Holding Company Investment Ltd | Financial services | 2021 |
| TK Holiday Property Ltd | Real estate | 2018 |
| TK Maxx | Wholesale & retail | 1992 |
| TK Tutor Ltd | Education | 2024 |
| TK United Ltd | Real estate | 2017 |
| Tkaps Trading Ltd | Information & communication | 2015 |
| Tksquared Ltd | Real estate | 2017 |
| Tl&E Holdings Limited | Real estate | 2020 |
| TLA Consultancy Ltd | Information & communication | 2010 |
| Tlcc Services Ltd | Administrative & support | 2020 |
| TLM Carpentry Ltd | Manufacturing | 2023 |
| TLP (Services) Ltd | Professional & scientific | 2023 |
| TM Contracts Ltd | Construction | 2013 |
| TM Fitzgerald Ltd | Professional & scientific | 2019 |
| TM Motors Limited | Wholesale & retail | 2025 |
| TM Robotics (Europe) Limited | Manufacturing | 2000 |
| TM4A Ltd | Information & communication | 2026 |
| Tmarkethood Ltd | Wholesale & retail | 2023 |
| TMB Global Ltd | Wholesale & retail | 2021 |
| TMC Lettings Limited | Real estate | 2022 |
| TMC Management Consulting Limited | Professional & scientific | 2011 |
| TMK (UK) Ltd | Professional & scientific | 2015 |
| TMS Trading Ltd | Wholesale & retail | 2020 |
| TMV Project Limited | Hospitality | 2016 |
| TN7 Limited | Transport & logistics | 2018 |
| TNF Group Holdings Ltd | Financial services | 2024 |
| TNJ Holdings Limited | Manufacturing | 2018 |
| TNL Systems Limited | Wholesale & retail | 2009 |
| Toast Box Ltd | Hospitality | 2021 |
| TOB Associates Ltd | Extraterritorial | 2022 |
| Tobago Tracks Ltd | Arts & recreation | 2017 |
| Tobar-Naranjo Ltd | Real estate | 2023 |
| Tobias Window Cleaning Ltd | Administrative & support | 2013 |
| Tobli Consultancy Ltd | Information & communication | 2015 |
| Toby Tech Ltd | Professional & scientific | 2024 |
| TOD Smart Construction Company Limited | Construction | 2021 |
| Todd Doors Limited | Wholesale & retail | 1985 |