| Tamsin Evans Marketing Ltd | Professional & scientific | 2024 |
| Tanglin Property Holdings Ltd | Real estate | 2015 |
| Tanner Engineering Ltd | Professional & scientific | 2025 |
| Tarlia Accounting Limited | Professional & scientific | 2023 |
| Tarner Holdings Ltd | Financial services | 2026 |
| Tashmiyah Ltd | Information & communication | 2014 |
| Tasty Ready Limited | Hospitality | 2019 |
| Tayla Grace Property Ltd | Real estate | 2021 |
| Taylor & Stokes Building Services Limited | Construction | 2006 |
| Taylored Hospitality Solutions Ltd | Hospitality | 2022 |
| Taytel Systems Limited | Information & communication | 2016 |
| TB Bridge Solutions Ltd | Information & communication | 2026 |
| TB Technology Management Ltd | Information & communication | 2024 |
| TC Social Work Solutions Limited | Health & social care | 2019 |
| TCI Consultancy Limited | Professional & scientific | 2013 |
| TCS Tree Care Ltd | Agriculture & fishing | 2022 |
| TDI Cables Ltd | Wholesale & retail | 2024 |
| Tecfire Ltd | Professional & scientific | 2006 |
| Tedom Power UK Limited | Energy | 2010 |
| Tedom UK Limited | Manufacturing | 2022 |
| Teft Investments Ltd | Real estate | 2025 |
| Tekmaris Ltd | Manufacturing | 2024 |
| Teksub Limited | Manufacturing | 2017 |
| Telazac Consulting Limited | Professional & scientific | 2025 |
| Telefusion Yorkshire Limited | Wholesale & retail | 2025 |
| Telemetrix Ltd | Extraterritorial | 2022 |
| Telirama Ltd | Transport & logistics | 2025 |
| Tempete Services Ltd | Information & communication | 2024 |
| Templegate Financial Planning Limited | Financial services | 2002 |
| Templeton Hill Limited | Information & communication | 2021 |
| Temprotech Limited | Administrative & support | 2002 |
| Tennyson Finn Ltd | Manufacturing | 2018 |
| Tenzone Targets Limited | Manufacturing | 2016 |
| TEO Property Solutions Ltd | Real estate | 2024 |
| Terra Investments Limited | Professional & scientific | 1998 |
| Terram Energy Limited | Water & waste | 2023 |
| Terratank Ltd | Administrative & support | 2021 |
| Terry Lynch Handmade Ltd | Manufacturing | 2023 |
| Test Valley Citizens Advice Bureau | Information & communication | 2014 |
| Test Valley Garden Buildings Ltd | Construction | 2024 |
| Test Valley Garden Machinery Limited | Other services | 2020 |
| Test Valley Glass and Window Company Limited | Construction | 1995 |
| Test Valley Heating Limited | Construction | 2019 |
| Test Valley Investments Limited | Financial services | 2023 |
| Test Valley Limited | Wholesale & retail | 2009 |
| Test Valley Property Limited | Real estate | 2023 |
| Test Valley Skips Ltd. | Water & waste | 2012 |
| Test Valley Wetlands Limited | Water & waste | 2021 |
| Teza Homes Ltd | Real estate | 2019 |
| Teza Homes Ventures Ltd | Financial services | 2018 |
| TFS Aviation Limited | Transport & logistics | 2012 |
| TGA Logistic Limited | Transport & logistics | 2016 |
| TGS Group Services Ltd | Other services | 2025 |
| Thatch Rain Catcher Ltd | Construction | 2025 |
| Thatching Advisory Services Limited | Wholesale & retail | 1974 |
| THE Agricultural Mortgage Corporation PLC | Financial services | 1928 |
| THE Alternative Flooring Company Limited | Wholesale & retail | 2004 |
| THE Arboricultural Company Ltd | Agriculture & fishing | 2020 |
| THE Army Central Fund Trustee Limited | Extraterritorial | 2019 |
| THE Asset Exchange Network Ltd | Information & communication | 2025 |
| THE BAD Penny Hair Studio Ltd | Other services | 2019 |
| THE Baggery Packaging Limited | Administrative & support | 2020 |
| THE Barns (Winchester) Management Limited | Households | 2025 |
| THE Barns Property Management Co. Limited | Households | 2019 |
| THE Beast Asylum Limited | Wholesale & retail | 2021 |
| THE Best Energy Rates Ltd | Energy | 2023 |
| THE British Swimming Pool Federation Limited | Other services | 1961 |
| THE Clanville Lion Limited | Hospitality | 2014 |
| THE Classical LOO Company Limited | Professional & scientific | 1996 |
| THE Co Research Trust | Professional & scientific | 2005 |
| THE Co-Laboratory Limited | Professional & scientific | 2023 |
| THE Coaching Compass Ltd | Professional & scientific | 2025 |
| THE Collicott Collection Ltd | Hospitality | 2025 |
| THE Collier Group Ltd | Information & communication | 2018 |
| THE Corgi Trust | Extraterritorial | 2009 |
| THE Courtyard Management Company (Appleshaw) Limited | Households | 2007 |
| THE Crown Tisbury Management Ltd | Households | 2022 |
| THE Cutting Edge Andover Limited | Other services | 2018 |
| THE Dowlings Management Company Limited | Households | 2018 |
| THE Elderflower Pubco. Limited | Hospitality | 2019 |
| THE European Ozone Trade Association Limited | Other services | 2015 |
| THE Field Box Company Ltd | Wholesale & retail | 2025 |
| THE Financial Strategist Limited | Professional & scientific | 2025 |
| THE Flat CAP Coffee Academy Limited | Manufacturing | 2024 |
| THE Full Moon Cake Company Limited | Manufacturing | 2014 |
| THE GAS Safety Trust | Professional & scientific | 2021 |
| THE Gilet Company Limited | Wholesale & retail | 2019 |
| THE GIN Stall Ltd | Wholesale & retail | 2017 |
| THE Ginger Bread Lady Ltd | Hospitality | 2025 |
| THE Glow Zone Lighting Ltd | Wholesale & retail | 2024 |
| THE Hampshire Fair Ltd | Administrative & support | 2019 |
| THE Handover Book Ltd | Information & communication | 2018 |
| THE Investing Collective Ltd | Professional & scientific | 2023 |
| THE Kitten's Emporium Ltd | Wholesale & retail | 2025 |
| THE KJM Group Limited | Construction | 1983 |
| THE Lifestyle Card Ltd | Other services | 2018 |
| THE Liner GUY Ltd | Construction | 2025 |
| THE Little Whisky Shop Ltd | Wholesale & retail | 2018 |
| THE Living Heart Community Ltd | Professional & scientific | 2019 |
| THE Local Marketing Company Ltd | Professional & scientific | 2023 |