| Taylor Rail (Hastings) Limited | Construction | 2016 |
| Taylor Richardson Electrical Ltd | Construction | 2021 |
| Taylormade Paving Ltd | Administrative & support | 2026 |
| TC Carpentry and Building Limited | Construction | 2020 |
| Tea and Talk Ltd | Manufacturing | 2025 |
| Tech-Electrical Contractors Ltd | Construction | 2020 |
| Technical Access Solutions Ltd | Manufacturing | 2020 |
| Tekota Construction Limited | Construction | 2021 |
| Temals Globals Ltd | Wholesale & retail | 2025 |
| TFS 1066 Ltd | Construction | 2017 |
| Tgsolution Ltd | Transport & logistics | 2024 |
| Thasneakylink Ltd | Wholesale & retail | 2025 |
| THE 'Y' Trustees Limited | Extraterritorial | 2010 |
| THE 27 Tower Road RTM Company Limited | Households | 2010 |
| THE Artistic Wanderer Trading Post Ltd | Wholesale & retail | 2025 |
| THE Athenaeum (Hove) Limited | Households | 2003 |
| THE Audio Agency Ltd | Information & communication | 2022 |
| THE Back 9 Club Ltd | Arts & recreation | 2026 |
| THE Big Bridge Company (Europe) Ltd | Administrative & support | 2006 |
| THE Boat House (RYE) Management Company Limited | Households | 1991 |
| THE Boscobel Lodge Residents Company Limited | Hospitality | 1992 |
| THE Brixton Framers Ltd | Wholesale & retail | 2020 |
| THE Car DEN Storage Ltd | Transport & logistics | 2023 |
| THE Castle Inn Limited | Hospitality | 2003 |
| THE Cushion Warehouse Limited | Wholesale & retail | 2008 |
| THE Down's Syndrome Research Foundation Limited | Professional & scientific | 1996 |
| THE Dripping PIG Barbecue Ltd | Hospitality | 2025 |
| THE ENT Clinic Limited | Health & social care | 2007 |
| THE Fairway 1958 Limited | Extraterritorial | 2014 |
| THE Fairway 1965 Limited | Extraterritorial | 2014 |
| THE Forbidden Fruit Bar Ltd | Hospitality | 2020 |
| THE Gourmet Sausage, Burger & Catering Limited | Hospitality | 2017 |
| THE Grapevine RYE Club Ltd | Arts & recreation | 2019 |
| THE Grapevine RYE Live Ltd | Wholesale & retail | 2022 |
| THE Grapevine RYE Ltd | Hospitality | 2020 |
| THE Grapevine Tenterden Ltd | Hospitality | 2024 |
| THE Hastings Ketchup Company Limited | Manufacturing | 2013 |
| THE Hastings Project Public House CIC | Hospitality | 2025 |
| THE House of Honfleur Limited | Wholesale & retail | 1999 |
| THE Lighting Club Ltd | Manufacturing | 2026 |
| THE Living Room (SE) Ltd | Arts & recreation | 2020 |
| THE Maltings Management Company (Dunstable) Limited | Households | 1994 |
| THE Manor Hastings Limited | Households | 2011 |
| THE Mexicannos Ltd | Hospitality | 2025 |
| THE Moat (Crawley) Management Limited | Households | 1990 |
| THE Old Town Market Hastings Ltd | Hospitality | 2025 |
| THE Open Fountain Trust | Other services | 2007 |
| THE Pie-Piper Ltd | Wholesale & retail | 2022 |
| THE Property PAD Limited | Real estate | 2015 |
| THE Rebuild Community Ltd | Wholesale & retail | 2024 |
| THE Residents Association of TEN Sussex Square Limited | Households | 1988 |
| THE Ridge Communal Area Ltd | Households | 2022 |
| THE Rise - Men’S Retreats Ltd | Health & social care | 2025 |
| THE Rogue Monkey Group Limited | Education | 2020 |
| THE Roundel Preservation Company Limited | Agriculture & fishing | 1994 |
| THE Snowflake Trust Limited | Hospitality | 2006 |
| THE Swiss Branch Limited | Information & communication | 2002 |
| THE Training Room Limited | Information & communication | 1999 |
| THE Trio Synergize Group Limited | Extraterritorial | 2024 |
| THE UK Spice Company Ltd | Wholesale & retail | 2011 |
| THE Welcome ST. Leonards Limited | Hospitality | 2018 |
| THE West Villa Ltd | Real estate | 2025 |
| Thehealthcorner Limited | Health & social care | 2018 |
| Thehealthshelf Limited | Wholesale & retail | 2014 |
| Thehumblewarrior Ltd | Real estate | 2020 |
| Thermo-Core Ltd | Construction | 2026 |
| Thirlwell Carpets and Flooring Ltd | Wholesale & retail | 2015 |
| Thirty SIX Freehold Limited | Other services | 2020 |
| Thomas Care Consultancy Ltd | Professional & scientific | 2019 |
| Thomas David Financial Services Limited | Financial services | 2024 |
| Thrivewise 360 Ltd | Education | 2026 |
| Tidemanor Limited | Real estate | 1985 |
| Timber Windows and Doors Hastings Ltd | Construction | 2025 |
| Tiny Treat Boutique Limited | Manufacturing | 2016 |
| Tippi&Co Limited | Other services | 2025 |
| TJ Export PVT Ltd | Wholesale & retail | 2023 |
| TJL Recruitment Ltd | Administrative & support | 2026 |
| TK Building Services 1066 Ltd | Construction | 2022 |
| Tkcare Ltd | Health & social care | 2020 |
| TL UK Services Limited | Professional & scientific | 2026 |
| TN37 (Freehold) Limited | Households | 2022 |
| Toad Hall Dental Ltd | Health & social care | 2025 |
| Toad Hall Surgeries Ltd | Health & social care | 2013 |
| Together Consulting Ltd | Extraterritorial | 2021 |
| Tollgates House RTM Company Limited | Extraterritorial | 2015 |
| Tombstone Fabrications Ltd | Extraterritorial | 2021 |
| Tony Take IT Easy Ltd | Information & communication | 2016 |
| Top GUN Clothing Limited | Wholesale & retail | 2002 |
| Top of the Hill Property Ltd | Real estate | 2025 |
| Topgun Ltd | Wholesale & retail | 2008 |
| Totally Marvellous Creations Ltd | Professional & scientific | 2025 |
| Tovah Bird Ltd | Wholesale & retail | 2021 |
| Tower House 1066 Limited | Hospitality | 2023 |
| Tower Road West Limited | Real estate | 2014 |
| Trade Support Partners (Sussex) Limited | Financial services | 2015 |
| Trade Support Partners Limited | Professional & scientific | 2020 |
| Tradeflow Services Ltd | Information & communication | 2025 |
| TRADINGCARDS4ALL Ltd | Wholesale & retail | 2025 |
| TRAIN2LEARN Training Ltd | Education | 2026 |
| Traka Intelligence Ltd | Information & communication | 2025 |