| Tri-Star Housewares Limited | Wholesale & retail | 2014 |
| Tri-Star Imports & Exports Limited | Wholesale & retail | 2024 |
| Trialpha Recruiters Limited | Information & communication | 2023 |
| Triangoals Community Interest Company | Health & social care | 2014 |
| Triathlon UK Limited | Transport & logistics | 2018 |
| Tridha Consultancy Services Limited | Wholesale & retail | 2020 |
| Trigold Services UK Limited | Other services | 2010 |
| Trim-Art Pro Ltd | Construction | 2017 |
| Trimzbytizz Ltd | Other services | 2025 |
| Trin Solutions Limited | Information & communication | 2025 |
| Trinity Jewellery Limited | Wholesale & retail | 2025 |
| Triple T Media Consult Ltd | Information & communication | 2015 |
| Trips and Holidays Limited | Administrative & support | 2016 |
| Tristar Accountants Ltd | Professional & scientific | 2019 |
| Trivoca Limited | Transport & logistics | 2011 |
| TRM Care Holdings Ltd | Financial services | 2026 |
| Trovedeals Ltd | Wholesale & retail | 2025 |
| TRR 2016 Ltd | Construction | 2016 |
| True Cadence CIC | Other services | 2020 |
| True Care Companion Ltd | Health & social care | 2024 |
| True Crash Repairs Limited | Wholesale & retail | 2024 |
| Trueaid Services Limited | Administrative & support | 2025 |
| Truecell Ltd | Wholesale & retail | 2025 |
| Trusted London Builders Ltd | Construction | 2016 |
| Trustmanagementconsulting Limited | Professional & scientific | 2016 |
| Trustwell Accounting Ltd | Professional & scientific | 2026 |
| TSA Contractor Ltd | Construction | 2019 |
| Tsang's Frozen Food Ltd | Wholesale & retail | 2010 |
| Tsanko Ltd | Construction | 2014 |
| TSG Wheels Ltd | Transport & logistics | 2024 |
| Tshh Ltd | Hospitality | 2020 |
| Tsopelas Ltd | Administrative & support | 2016 |
| TSS Electrical Resources Limited | Information & communication | 2024 |
| Ttogs Limited | Wholesale & retail | 2024 |
| Tuck Inn Coffee Ltd | Hospitality | 2025 |
| Tuck-In-Deserts Ltd | Hospitality | 2025 |
| Tunj Healthcare Ltd | Health & social care | 2025 |
| Tunse Food Ltd | Hospitality | 2014 |
| Turbotidy Cleaning Ltd | Administrative & support | 2025 |
| Turnwright Limited | Manufacturing | 1977 |
| Tutti Jessy Ltd | Transport & logistics | 2018 |
| TV Mount Mate Limited | Other services | 2022 |
| TVC London Ltd | Construction | 2024 |
| TVI Learning | Education | 2012 |
| Tvrs Education and Training Academy Ltd | Education | 2019 |
| TW Furnitures Ltd | Manufacturing | 2026 |
| TW Outsourcing Ltd | Wholesale & retail | 2018 |
| Twickenham Property Investments Ltd | Real estate | 2020 |
| Twiin Limited | Information & communication | 2017 |
| Twincharged Media Ltd | Information & communication | 2023 |
| Twinkle Summer London Ltd | Hospitality | 2024 |
| Twism Ltd | Transport & logistics | 2021 |
| Twister Digital Media Limited | Information & communication | 2013 |
| Twmmcorporation Ltd | Mining & quarrying | 2021 |
| Twostars 24 UK Ltd | Hospitality | 2025 |
| TXL Training Ltd. | Education | 2017 |
| Txwff Investments Ltd | Real estate | 2024 |
| TYB Enterprise Ltd | Wholesale & retail | 2026 |
| Tycoon Builders Limited | Construction | 2025 |
| Tynkabelle Healthcare Group Limited | Health & social care | 2015 |
| TYRESE2000 Limited | Health & social care | 2014 |
| TZA Group Ltd | Real estate | 2025 |
| TZA Holdings Ltd | Construction | 2021 |
| U & Y Properties Ltd | Real estate | 2023 |
| U Construction Ltd | Construction | 2025 |
| UA Networks Limited | Professional & scientific | 2016 |
| Ucfc Limited | Construction | 2014 |
| Uchida Consulting Service Ltd | Professional & scientific | 2014 |
| Uchstradamus Services Ltd | Wholesale & retail | 2025 |
| Uddin Pitstop Ltd | Wholesale & retail | 2025 |
| UFA Digital Tech Ltd | Wholesale & retail | 2019 |
| UFH Projects Ltd | Construction | 2018 |
| Uganda Community Cohesion UK (Ucc-Uk) | Other services | 2023 |
| Uganda Nurses and Midwives Association in UK (Unma-Uk) CIC | Health & social care | 2023 |
| UGC Labs Ltd | Professional & scientific | 2026 |
| UGC Vids AI Ltd | Information & communication | 2026 |
| UGO Best Limited | Wholesale & retail | 2019 |
| UK Advice Point Ltd | Administrative & support | 2016 |
| UK Aluminium & Glazing Ltd | Manufacturing | 2025 |
| UK Appliances Repair Ltd | Other services | 2010 |
| UK Archers Ltd | Administrative & support | 2020 |
| UK Automobiles Ltd | Wholesale & retail | 2023 |
| UK Best Doner Ltd | Wholesale & retail | 2024 |
| UK Best Serve Ltd | Information & communication | 2023 |
| UK Build 4 London Ltd | Construction | 2026 |
| UK Care Alliance Ltd. | Health & social care | 2015 |
| UK Community Impact, Sport & Health CIC | Health & social care | 2026 |
| UK Corner Trading Limited | Wholesale & retail | 2026 |
| UK Digi Tech Ltd | Wholesale & retail | 2023 |
| UK Direct Export Ltd | Wholesale & retail | 2024 |
| UK Email Limited | Wholesale & retail | 2025 |
| UK Essex Construction Limited | Construction | 2023 |
| UK Fashion Limited | Other services | 2024 |
| UK Fresh Halal Meats Ltd | Wholesale & retail | 2018 |
| UK Golden Nest Ltd | Real estate | 2023 |
| UK Heating & Plumbing Ltd | Construction | 2022 |
| UK Inks 2U Limited | Manufacturing | 2018 |
| UK Legal Advice Ltd | Professional & scientific | 2020 |
| UK Metal Gates Ltd | Manufacturing | 2021 |
| UK Multi Group Limited | Wholesale & retail | 2025 |