| TPZ Consulting and Marketing Ltd | Information & communication | 2021 |
| TR Comms Ltd | Professional & scientific | 2022 |
| TR Mini Mart Ltd | Wholesale & retail | 2024 |
| TR Quantum Limited | Real estate | 2023 |
| TR Sons Ltd | Construction | 2025 |
| TR19 Cleaning Limited | Administrative & support | 2024 |
| TR2TH Limited | Other services | 2017 |
| TRACK123 Ltd | Professional & scientific | 2020 |
| Trackforge Studios Ltd | Information & communication | 2026 |
| Tracy & Russell Rose Productions Limited | Information & communication | 1993 |
| Trade 2 Trade Windows Limited | Construction | 2009 |
| Trade Beers Limited | Wholesale & retail | 1996 |
| Trade Kitchens Online Limited | Professional & scientific | 2012 |
| Trade Orbit Ltd | Wholesale & retail | 2026 |
| Trade Pride Limited | Wholesale & retail | 2013 |
| Trade Sprint Ltd | Wholesale & retail | 2025 |
| Trade Stone (UK) Ltd | Other services | 2013 |
| Trade Tycoons Limited | Wholesale & retail | 2025 |
| Trade Windows & Doors Ltd | Administrative & support | 2023 |
| Trade With Liam Ltd | Administrative & support | 2026 |
| Tradebridgers Ltd | Information & communication | 2026 |
| Tradecraft Store Limited | Wholesale & retail | 2024 |
| Tradedeals Outlet Ltd | Wholesale & retail | 2026 |
| Tradeecom Solutions Ltd | Wholesale & retail | 2025 |
| Tradego Limited | Administrative & support | 2015 |
| Tradegrit Ltd | Wholesale & retail | 2024 |
| Tradehub Plus Ltd | Administrative & support | 2024 |
| Tradeify Ltd | Wholesale & retail | 2025 |
| Tradeline PVC Systems Ltd | Manufacturing | 2006 |
| Tradelink (Ilford) Limited | Real estate | 2015 |
| Trademate Group Ltd | Wholesale & retail | 2024 |
| Tradequote Limited | Information & communication | 2019 |
| Trader London Ltd | Administrative & support | 2017 |
| Traders Hub Limited | Wholesale & retail | 2021 |
| Tradestone Commercials Limited | Real estate | 2020 |
| Tradeuk Ltd | Wholesale & retail | 2023 |
| Tradeway Cash and Carry Limited | Wholesale & retail | 2024 |
| Trading AS Frames Limited | Manufacturing | 2025 |
| Trading CUD Global Ltd | Wholesale & retail | 2024 |
| Trading Masters Ltd | Wholesale & retail | 2025 |
| Traditii by Alex Limited | Hospitality | 2023 |
| Trafinium Ventures Ltd | Information & communication | 2026 |
| Train Works (UK) Limited | Wholesale & retail | 2006 |
| Training and Employment Services Ltd | Administrative & support | 2020 |
| Trambells Learning Club Ltd | Education | 2023 |
| Tranquil Apartments Ltd | Real estate | 2025 |
| Trans Container Pro Ltd | Transport & logistics | 2019 |
| Trans LUC Ltd | Transport & logistics | 2014 |
| TRANS4MATION Healthcare Ltd | Health & social care | 2023 |
| Transcend Energy Solutions Ltd | Construction | 2026 |
| Transcended Visuals Ltd | Information & communication | 2015 |
| Transcendence Technology & Therapy Limited | Health & social care | 2024 |
| Transcom Logistic Ltd | Transport & logistics | 2020 |
| Transcom Tech UK Ltd | Wholesale & retail | 2025 |
| Transformative Waves Hypnotherapy Ltd | Health & social care | 2024 |
| Transformyou Ltd | Information & communication | 2020 |
| Transglobal Admissions Ltd | Hospitality | 2011 |
| Transgong Ltd | Wholesale & retail | 2019 |
| Transition Town IG3 CIC | Professional & scientific | 2022 |
| Translify Limited | Professional & scientific | 2026 |
| Transmart KO Ltd | Construction | 2017 |
| Transnat Ltd | Real estate | 2020 |
| Transpatron Limited | Transport & logistics | 2016 |
| Transpipe Ltd | Information & communication | 2025 |
| Transpiring Limited | Public administration | 2022 |
| Transport Online UK Limited | Wholesale & retail | 2016 |
| Transport TEO Ltd | Transport & logistics | 2024 |
| Transport Van BR Ltd | Transport & logistics | 2025 |
| Transportlondon Ltd | Construction | 2023 |
| Transportudorelconstruction Limited | Construction | 2025 |
| Transportyannisconstruction Limited | Construction | 2025 |
| Transylvanian Foods Ltd | Wholesale & retail | 2013 |
| Transzen Technologies Ltd | Professional & scientific | 2024 |
| Tranzitt Mobility Limited | Information & communication | 2018 |
| Trasatlantic Skin Brands Ltd | Wholesale & retail | 2021 |
| Travel AI (PVT) Ltd | Wholesale & retail | 2024 |
| Travel and Money Ltd | Wholesale & retail | 2019 |
| Travel Beyond Inc Ltd | Administrative & support | 2024 |
| Travel Bliss Retreats Ltd | Other services | 2025 |
| Travel Diary Tourism Ltd | Administrative & support | 2019 |
| Travel Express Worldwide Ltd | Administrative & support | 2022 |
| Travel for Success Ltd | Administrative & support | 2011 |
| Travel Geek Ltd | Transport & logistics | 2025 |
| Travel in Style Services Ltd | Other services | 2018 |
| Travel Nutters Limited | Administrative & support | 2015 |
| Travel Trick Ltd | Administrative & support | 2018 |
| Travellers Inn Hotel Limited | Hospitality | 2019 |
| Travellers Rest Forever Limited | Real estate | 2014 |
| Traveloop Ltd | Hospitality | 2025 |
| Travelsureuk Ltd | Administrative & support | 2019 |
| Travten Ltd | Wholesale & retail | 2025 |
| Traxvason Limited | Wholesale & retail | 2021 |
| Trazhi Builders Ltd | Construction | 2021 |
| TRC Consult Limited | Information & communication | 2025 |
| Treadstone Healthcare Limited | Transport & logistics | 2018 |
| Treadstone Limited | Extraterritorial | 2016 |
| Treadstone Logistics Limited | Administrative & support | 2018 |
| Treadstone Medical Limited | Administrative & support | 2018 |
| Treadstone Surveying Ltd | Other services | 2020 |
| Treasurelanemarket Ltd | Wholesale & retail | 2025 |