| Trade HUT Direct Limited | Wholesale & retail | 2019 |
| Trade IT ALL Ltd | Wholesale & retail | 2025 |
| Trade Properties Limited | Real estate | 2013 |
| Trade Sale Motorhomes Ltd | Wholesale & retail | 2023 |
| Trade Sea Ltd | Wholesale & retail | 2026 |
| Trade TEK Ltd | Extraterritorial | 2024 |
| Trade Territory Ltd | Information & communication | 2025 |
| Trade Understairs Storage Limited | Construction | 2025 |
| Trade World NW Ltd | Wholesale & retail | 2022 |
| TRADE5230 Ltd | Wholesale & retail | 2023 |
| Tradeline Direct Limited | Wholesale & retail | 2026 |
| Tradelink App Limited | Information & communication | 2025 |
| Trademark Joinery Ltd | Construction | 2025 |
| Traders Grove Ltd | Wholesale & retail | 2025 |
| Trades on Demand Ltd | Manufacturing | 2019 |
| Tradescape Holdings Limited | Financial services | 2021 |
| Tradescape HR Limited | Administrative & support | 2021 |
| Tradescape Limited | Wholesale & retail | 2021 |
| Tradescape Logistics Limited | Wholesale & retail | 2020 |
| Tradescape Merchants Limited | Wholesale & retail | 2021 |
| Tradescape Wholesale Limited | Wholesale & retail | 2021 |
| Tradewheels Ltd | Wholesale & retail | 2024 |
| Tradewinds Europe Ltd | Wholesale & retail | 2004 |
| Trading Advanced Ltd | Wholesale & retail | 2022 |
| Tradingsagar Ltd | Wholesale & retail | 2025 |
| Traditional Fish and Chips (Whitefield) Ltd | Hospitality | 2018 |
| Traditional Funfairs Limited | Arts & recreation | 2016 |
| Traditional Threads Limited | Wholesale & retail | 2024 |
| Traffic Management Survey and Design Limited | Professional & scientific | 2014 |
| Trafford Park Investments Limited | Real estate | 2021 |
| Trag Limited | Wholesale & retail | 2024 |
| Traian Developments Ltd | Construction | 2023 |
| Trail Forensics Ltd | Professional & scientific | 2014 |
| Trailblaze Adventure Gear Ltd | Manufacturing | 2025 |
| Trailer Logistics Limited | Transport & logistics | 2015 |
| Train & Test Bookings Ltd | Education | 2020 |
| Train 4 Tomorrow Ltd | Education | 2024 |
| Train Your Game Ltd | Education | 2025 |
| Training by Paige Alexandra Ltd | Education | 2022 |
| Training for Tomorrow (UK) Ltd | Education | 2018 |
| Training Group & the Care Ltd | Education | 2015 |
| Training Xpress Limited | Extraterritorial | 2018 |
| Tramp Music Limited | Information & communication | 2017 |
| Tranent Propco SL Limited | Extraterritorial | 2011 |
| Tranquil Hair and Beauty Liverpool Ltd | Other services | 2020 |
| Tranquil Spa (Hull) Limited | Other services | 2018 |
| Tranquil Spa Beauty Hull Ltd | Other services | 2020 |
| Tranquil Spa Halifax Ltd | Other services | 2021 |
| Tranquil Spa Huddersfield Ltd | Other services | 2018 |
| Tranquil Spa Merryhill Ltd | Other services | 2016 |
| Trans Flyex Ltd | Wholesale & retail | 2025 |
| Transcend Enterprise Ltd | Information & communication | 2023 |
| Transdock Limited | Manufacturing | 2019 |
| Transfer 14425794 Ltd | Other services | 2022 |
| Transform My Conservatory Limited | Construction | 2015 |
| Transforming Lives Group CIC | Health & social care | 2024 |
| Transformly Services Limited | Information & communication | 2019 |
| Transil Property Group Limited | Real estate | 2022 |
| Transparent Aesthetics Ltd | Other services | 2014 |
| Transport Support Ltd | Extraterritorial | 2003 |
| Transport to School Limited | Transport & logistics | 2014 |
| Transport Training & Compliance Ltd | Transport & logistics | 2022 |
| Transporter Training Solutions Ltd | Transport & logistics | 2026 |
| Transporters 247 Ltd | Wholesale & retail | 2021 |
| Transporters Global Limited | Information & communication | 2018 |
| Transporterz Ltd | Transport & logistics | 2019 |
| Transylvania Technology Ltd | Information & communication | 2017 |
| Tranzco Ltd | Wholesale & retail | 2026 |
| Tranzfast Logistica UK Limited | Transport & logistics | 2000 |
| Travel Concierge Ltd | Administrative & support | 2021 |
| Travel NOW UK Consult Ltd | Construction | 2023 |
| Travel Point Group Ltd | Wholesale & retail | 2022 |
| Travel Today Bolton Limited | Administrative & support | 2025 |
| Travel Twins Limited | Transport & logistics | 2025 |
| Travel-Helper UK Limited | Administrative & support | 2020 |
| Travelcare World Limited | Administrative & support | 2001 |
| Travelflex UK Limited | Administrative & support | 2022 |
| Travelhubuk Limited | Transport & logistics | 2024 |
| Travelled Limited | Information & communication | 2023 |
| Travelwise Holidays Ltd | Transport & logistics | 2010 |
| Travpedia and North Limited | Administrative & support | 2024 |
| Traydis Ltd | Wholesale & retail | 2025 |
| TRC Maintenance Solutions Limited | Construction | 2026 |
| Treads Tyres (NW) Limited | Wholesale & retail | 2013 |
| Treandytreasuruk Ltd | Wholesale & retail | 2026 |
| Treatz & Blizz Ltd | Wholesale & retail | 2013 |
| Trecon Limited | Information & communication | 2017 |
| Tred Earth Limited | Financial services | 2019 |
| Tred Flooring Ltd | Construction | 2026 |
| Tree Fish Productions Limited | Education | 2024 |
| Tree Master Pro Bolton Limited | Administrative & support | 2023 |
| Treetraders Ltd | Wholesale & retail | 2024 |
| Treka BUS Limited | Manufacturing | 2023 |
| Treko Cars Ltd | Wholesale & retail | 2021 |
| Trelleborg Security Limited | Administrative & support | 2017 |
| Trench One Limited | Information & communication | 2017 |
| Trenchless Holdings Limited | Construction | 2009 |
| Trend Mania Limited | Information & communication | 2013 |
| Trend Soft Furnishings UK Ltd | Manufacturing | 2018 |
| Trendropsuk Limited | Wholesale & retail | 2025 |