| Tomorrow Fuels Limited | Water & waste | 2016 |
| Toms Decor Limited | Construction | 2026 |
| Tomson and Lily Ltd | Health & social care | 2024 |
| Tomson Prestige Ltd | Construction | 2019 |
| Tomsons Care and Support Limited | Health & social care | 2025 |
| Tom’S Smart Security Ltd | Wholesale & retail | 2026 |
| Toner-Seb Ltd | Wholesale & retail | 2018 |
| Tool Kingdom Ltd | Wholesale & retail | 2022 |
| Toor Design Ltd | Professional & scientific | 2025 |
| Tooting Karahi & Co. Ltd | Hospitality | 2024 |
| Top 2 TOE (London) Ltd | Other services | 2006 |
| Top Barbers Hounslow Ltd | Other services | 2022 |
| Top Best Way Ltd | Wholesale & retail | 2023 |
| Top G Gents Grooming Ltd | Real estate | 2023 |
| Top GEN Ltd | Wholesale & retail | 2011 |
| Top Mobile and Vape Ltd | Wholesale & retail | 2024 |
| Top Notch Products Limited | Wholesale & retail | 2025 |
| Top Petrov Ltd | Administrative & support | 2018 |
| Top Positions Limited | Professional & scientific | 2021 |
| Top Quality Products Ltd | Wholesale & retail | 2019 |
| Top Score Group Limited | Professional & scientific | 2014 |
| Top Tier Bathroom Limited | Wholesale & retail | 2018 |
| Top VIP Services Limited | Administrative & support | 2022 |
| Toprank Tutors Limited | Education | 2024 |
| Tora Build Ltd | Construction | 2019 |
| Toranto Shoping Mart Limited | Wholesale & retail | 2025 |
| Toravision Ltd | Wholesale & retail | 2025 |
| Tori's Building Contractors Ltd | Construction | 2019 |
| Total Care Locksmiths Ltd | Other services | 2025 |
| Total Force Management Ltd | Administrative & support | 2023 |
| Total Hair & Beauty Salon Ltd | Other services | 2018 |
| Total Health Solutions Limited | Health & social care | 2010 |
| Total Home Construction Ltd | Construction | 2026 |
| Total Protection Management Ltd | Administrative & support | 2016 |
| Total Residential Management Limited | Real estate | 2009 |
| Total RO Cleaning Ltd | Administrative & support | 2025 |
| Total Tyre Recovery Ltd | Water & waste | 2026 |
| Touch Renovations Ltd | Construction | 2025 |
| Touch Telecoms Limited | Information & communication | 2008 |
| Tower Group 1 Ltd | Construction | 2025 |
| Towfigh Ltd | Real estate | 2023 |
| Toy Cottage Ltd | Wholesale & retail | 2013 |
| Toyloco Toys Ltd | Manufacturing | 2018 |
| Toys Wizard UK Limited | Wholesale & retail | 2013 |
| Tozzy Trans Ltd | Transport & logistics | 2020 |
| TPC Investments Ltd | Real estate | 2026 |
| Tpin AJ Ltd | Construction | 2025 |
| TPS Bookkeeping Services LLP | | 2019 |
| TRA Catering Ltd | Hospitality | 2025 |
| Tracy Dickinson Ltd | Extraterritorial | 2022 |
| Trade Flow Holdings Ltd | Wholesale & retail | 2026 |
| Trade Links Investment Ltd | Financial services | 2023 |
| Trade Munch Distribution Ltd | Wholesale & retail | 2024 |
| Trade Saga Ltd | Construction | 2024 |
| Trader Market Limited | Information & communication | 2023 |
| Tradezilla Limited | Wholesale & retail | 2017 |
| Tragopan Logistics Ltd | Professional & scientific | 2021 |
| Trailblazer Sports Ltd | Wholesale & retail | 2025 |
| Training Connect Ltd | Education | 2022 |
| Training Innovators Ltd | Education | 2008 |
| Training Square Group Limited | Information & communication | 2024 |
| Trans Export Ltd | Wholesale & retail | 2016 |
| Transact Client PVT Ltd | Information & communication | 2025 |
| Transform the Narrative Ltd | Other services | 2024 |
| Transforma Services Ltd | Information & communication | 2021 |
| Transglobe Haulage Ltd | Water & waste | 2025 |
| Transit Swift Ltd | Transport & logistics | 2024 |
| Transord International Ltd | Transport & logistics | 2023 |
| Transport Ariel Ltd | Transport & logistics | 2021 |
| Transport for Glory Limited | Transport & logistics | 2019 |
| Transport Training Group Limited | Education | 2022 |
| Transvan Logistics Ltd | Transport & logistics | 2023 |
| Transwin Company Ltd | Transport & logistics | 2017 |
| Tranztek Limited | Information & communication | 2014 |
| Trav Expert Limited | Administrative & support | 2017 |
| Travability Limited | Administrative & support | 2015 |
| Travel Garden Ltd | Administrative & support | 2022 |
| Travel Safely Nationwide Ltd | Transport & logistics | 2009 |
| Travelbooth Ltd | Transport & logistics | 2025 |
| Travelobuddy Limited | Administrative & support | 2023 |
| Travih Limited | Administrative & support | 2025 |
| Trawell Limited | Wholesale & retail | 2019 |
| Treaty Business Services Ltd | Administrative & support | 2021 |
| Treatz Hounslow Ltd | Wholesale & retail | 2023 |
| Treckwell Ltd | Administrative & support | 2024 |
| Tree Pallets Trading Ltd | Transport & logistics | 2020 |
| Trend-I Tech Limited | Wholesale & retail | 2010 |
| Trendy Hotels Ltd | Hospitality | 2019 |
| Trendy Tech Tool Ltd | Wholesale & retail | 2021 |
| Trendygearuk Ltd | Wholesale & retail | 2025 |
| Trendz by JM Ltd | Wholesale & retail | 2025 |
| Trendzy Limited | Wholesale & retail | 2022 |
| Trennify Ltd | Wholesale & retail | 2026 |
| Trent Minimarket Limited | Wholesale & retail | 2026 |
| Tres-Seven Capital Ltd | Professional & scientific | 2021 |
| Trezon Ltd | Wholesale & retail | 2026 |
| TRI Chauffeurs Ltd | Transport & logistics | 2018 |
| TRI Services Ltd | Wholesale & retail | 2020 |
| Triage Care Services Ltd | Health & social care | 2023 |
| Triangle Technologies Limited | Information & communication | 2024 |