| Strens Ltd | Professional & scientific | 2019 |
| Sussex Software Consultancy Ltd | Professional & scientific | 2013 |
| TDM Communications Ltd | Professional & scientific | 2026 |
| TEN BAT Ltd | Information & communication | 2021 |
| THE Cornstores Management Company Limited | Households | 2006 |
| THE Hard HAT Cafe Ltd | Hospitality | 2012 |
| THE Old Orchard Burwash Management Company Limited | Real estate | 2008 |
| THE Swedish House Company Limited | Construction | 1997 |
| THE Three Wolves Ltd | Information & communication | 2012 |
| Theatre of Dreams Limited | Professional & scientific | 1997 |
| Thomas Leveritt Ltd | Information & communication | 2011 |
| Tiger PAW Print Limited | Information & communication | 2017 |
| Tilsmore Masonic Hall Company Limited | Other services | 1982 |
| Tj's Diner Ltd | Other services | 2016 |
| Tops Office Supplies Ltd | Wholesale & retail | 1999 |
| Trii Consultancy Ltd | Professional & scientific | 2025 |
| Turf Solutions Installations Ltd | Construction | 2023 |
| U P B F Limited | Administrative & support | 2004 |
| UK Solergy Ltd | Construction | 2022 |
| Urbarn Gym Ltd | Other services | 2026 |
| Victoria Manser Limited | Professional & scientific | 2003 |
| Victory Ridge Consulting Ltd | Professional & scientific | 2023 |
| Virucy Ltd | Transport & logistics | 2026 |
| Volante Holdings Ltd | Financial services | 2024 |
| Wag'N'Tails Doggy Daycare Ltd. | Agriculture & fishing | 2025 |
| Wealden Cottages Management Company Limited | Real estate | 2001 |
| Westdown Park Management Company Limited | Households | 1998 |
| Wholebuild UK Ltd | Construction | 2004 |
| Woodlea Developments Limited | | 1987 |
| Yall Express Retail Limited | Wholesale & retail | 2020 |
| Zody AI Ltd | Information & communication | 2026 |