| TKR London Ltd | Construction | 2021 |
| TLA Tiling Ltd | Construction | 2018 |
| TLB Education and Family Support CIC | Education | 2025 |
| TLB Educational & Family Support Services Limited | Education | 2025 |
| TLC Build and Design Limited | Construction | 2024 |
| TLC Services Limited | Financial services | 2021 |
| TLH Surveys Ltd | Professional & scientific | 2026 |
| TLT Solutions Limited | Other services | 1997 |
| TMA Professional Services LLP | | 2011 |
| Tmfit Ltd | Arts & recreation | 2014 |
| TMK Fuel Ltd | Wholesale & retail | 2021 |
| TMT Contract Lifting Ltd | Administrative & support | 2021 |
| TN (Construction Materials) Ltd | Construction | 2018 |
| TNS Deli Limited | Wholesale & retail | 2018 |
| Tnst Prime Limited | Real estate | 2025 |
| TO Your Abode Group Ltd | Real estate | 2024 |
| TOB Burgers Ltd | Hospitality | 2019 |
| Toberon Ltd | Financial services | 2021 |
| Toby FC Holdings Ltd | Arts & recreation | 2022 |
| Toby FC Leisure Ltd | Arts & recreation | 2022 |
| Tocia Properties Limited | Construction | 2012 |
| TOD PIV Ltd | Real estate | 2025 |
| Todo FX Ltd | Administrative & support | 2014 |
| Tolhurst Electrical Group Ltd | Construction | 2024 |
| TOM Holmes Productions Ltd | Information & communication | 2016 |
| TOM Stubbings Ltd | Transport & logistics | 2024 |
| Tomco Landscapes Ltd | Administrative & support | 2023 |
| Tomlinson's Medical Services Limited | Wholesale & retail | 2002 |
| Tommy Hanley Photography Limited | Professional & scientific | 2021 |
| Tomorrow's Talent Theatre Arts Limited | Arts & recreation | 2013 |
| Tomorrows Healthcare Today Limited | Professional & scientific | 2023 |
| Toms Farm Shop & Garden Centre Limited | Wholesale & retail | 2007 |
| Tonbey London Limited | Wholesale & retail | 2018 |
| Tony Nicholls Creative Limited | Professional & scientific | 2025 |
| Tony Stockwell Ltd | Other services | 2007 |
| Top Chelmsford Express Ltd | Other services | 2023 |
| Top Jump Trampoline Parks Limited | Arts & recreation | 2016 |
| Top Satellite Limited | Construction | 2012 |
| Top Shop (Chelmsford) Ltd | Wholesale & retail | 2026 |
| Top Sport Agency Ltd | Professional & scientific | 2023 |
| Top Tech Powertrain Solutions Ltd | Professional & scientific | 2021 |
| Top Trock Fire UK Limited | Wholesale & retail | 2013 |
| TOP1CARS Ltd | Wholesale & retail | 2020 |
| Topkel Limited | Health & social care | 2014 |
| Topo M Ltd | Professional & scientific | 2020 |
| Toponym Land Ltd | Professional & scientific | 2023 |
| Topscon Limited | Other services | 2018 |
| Topsy Turvy Day Nursery Ltd | Education | 2014 |
| Toptemi Limited | Real estate | 2024 |
| Topwurk Assets Ltd | Real estate | 2023 |
| Topwurk Ltd | Information & communication | 2021 |
| TOR Accounting Limited | Professional & scientific | 2021 |
| Tornado Properties Limited | Real estate | 2016 |
| Tornado Traction Limited | Transport & logistics | 2014 |
| Torrence Limited | Construction | 2013 |
| Toruore Services Limited | Health & social care | 2021 |
| Torus Risk Intelligence Limited | Information & communication | 2026 |
| Torus Risk Partners Limited | Financial services | 2026 |
| Total Electrical Limited | Construction | 1997 |
| Total Law Tuition Ltd | Education | 2025 |
| Total Practice Investments Ltd | Health & social care | 2014 |
| Total Practice Management Limited | Health & social care | 2013 |
| Total Vehicle Maintenance Ltd | Transport & logistics | 2017 |
| Totally Steel UK Ltd | Manufacturing | 2019 |
| Touch Bespoke Joinery Ltd | Construction | 2013 |
| Touch of DIY Limited | Construction | 2016 |
| Touch of Provence Limited | Real estate | 2011 |
| Touch-Needs Ltd | Wholesale & retail | 2000 |
| Touchstone Archaeology Limited | Professional & scientific | 2017 |
| Tourism Fiji UK Limited | Professional & scientific | 2014 |
| Tourworks Limited | Arts & recreation | 2018 |
| Toutatis Ltd | Education | 2015 |
| Tower Administration Ltd. | Professional & scientific | 2001 |
| Tower Croft IT Consultancy Limited | Information & communication | 2026 |
| Towngate Residents Management Company Limited | Households | 2003 |
| Townsend Logistics Ltd | Construction | 2012 |
| Toy Creations Limited | Wholesale & retail | 2025 |
| Toyo-Tech Automotive Ltd | Wholesale & retail | 2012 |
| Tozco Ltd | Real estate | 2016 |
| TP International Group Limited | Manufacturing | 2015 |
| TP4CREATIVE Ltd | Arts & recreation | 2024 |
| Tpuc Ltd | Wholesale & retail | 2022 |
| TQB JB Ltd | Hospitality | 2019 |
| TQM Motor Group Ltd | Wholesale & retail | 2022 |
| TQS BLU Holdings Limited | Real estate | 2021 |
| TQS BLU Limited | Administrative & support | 2016 |
| TR Business Solutions Ltd | Professional & scientific | 2017 |
| Trabec Properties Limited | Extraterritorial | 1961 |
| Tracy J Morgan Consultancy Ltd | Administrative & support | 2023 |
| Tracy's Barber Shop Ltd | Other services | 2025 |
| Trade Credit Risk Ltd | Administrative & support | 2023 |
| Trade Park Developments Limited | Real estate | 2013 |
| Tradengo Limited | Wholesale & retail | 2014 |
| Tradeops Solutions Limited | Administrative & support | 2025 |
| Traditional Leadwork and Roofing Limited | Construction | 1995 |
| Traditional Turkish Barbers Ltd | Other services | 2017 |
| Traer Clark Shepherd Angelo Limited | Construction | 2015 |
| Trafalgar Acquisitionco, Ltd. | Administrative & support | 2020 |
| Trafalgar Nominees Limited | Administrative & support | 1973 |
| Trail Boss Running Co. Ltd | Arts & recreation | 2022 |