| Sussex Heating Ltd | Construction | 2018 |
| Sussex Lime and Insulation Limited | Administrative & support | 2022 |
| Sussex Pure Water Ltd | Water & waste | 2023 |
| Sussex Renewable Energy Ltd | Construction | 2022 |
| Sussex Renewable Solutions Ltd | Construction | 2025 |
| Swappi Ltd | Information & communication | 2022 |
| Swift Tech Services Ltd | Professional & scientific | 2024 |
| System Plumbing & Heating Ltd | Construction | 2017 |
| T&J Driveways & Landscaping Ltd Ltd | Administrative & support | 2025 |
| Talisman Data Limited | Information & communication | 1994 |
| Taxi East Sussex Ltd | Construction | 2021 |
| Taylors Pet Services Limited | Other services | 2013 |
| Tazatech Ltd | Professional & scientific | 2025 |
| Tcdch Group Ltd | Administrative & support | 2025 |
| Tech-No (Sussex) Limited | Wholesale & retail | 2009 |
| Tech-Rehab Ltd | Other services | 2025 |
| Technology Advisory Service Limited | Manufacturing | 2008 |
| TEE Plus Care Ltd | Health & social care | 2025 |
| Telscombe Close (Residents) Limited | Other services | 2009 |
| Terra Norra Ltd | Professional & scientific | 2025 |
| Terry Parris Associates Limited | Administrative & support | 2006 |
| TGV Drivers Ltd | Transport & logistics | 2019 |
| THE Britfilm Network CIC | Education | 2025 |
| THE CAN Makers Limited | Other services | 1983 |
| THE Catt's EYE View Limited | Financial services | 2012 |
| THE Deans Magazine Limited | Information & communication | 2009 |
| THE Digital Asset Consultants Ltd | Professional & scientific | 2025 |
| THE Digital Petite Ltd | Professional & scientific | 2025 |
| THE Expanders Limited | Real estate | 2025 |
| THE Forge Maintenance Ltd | Households | 2017 |
| THE Green Centre Community Interest Company | Education | 2007 |
| THE Greenwich Rooms Limited | Hospitality | 2019 |
| THE Lioness Coaching Academy Ltd | Education | 2024 |
| THE Made by Company Limited | Extraterritorial | 2011 |
| THE Natural Healing Commune Limited | Health & social care | 2026 |
| THE One Crown Group Limited | Financial services | 2023 |
| THE President's Selection Ltd | Wholesale & retail | 2007 |
| THE Saxon Bar & Lounge Limited | Hospitality | 2019 |
| Theclubholdings Ltd | Arts & recreation | 2026 |
| Thewebmadesimple Limited | Extraterritorial | 2015 |
| Think to Print Ltd | Wholesale & retail | 2024 |
| Thornton Flooring Limited | Construction | 2011 |
| Thumbs Ltd | Wholesale & retail | 2016 |
| Tikk Ltd | Wholesale & retail | 2020 |
| Time Killer Productions Sussex Ltd | Extraterritorial | 2024 |
| Time to Talk and Time to Listen Limited | Health & social care | 2021 |
| TJC Evans Limited | Financial services | 2025 |
| TLC Upholstery Specialist Limited | Other services | 2017 |
| TLS Peacehaven Limited | Professional & scientific | 2005 |
| Toasted Ltd | Hospitality | 2020 |
| TOR Communications Limited | Information & communication | 1987 |
| Total Social Media Ltd | Arts & recreation | 2026 |
| Touba Multipurpose Express Limited | Transport & logistics | 2013 |
| Trackwise Limited | Professional & scientific | 2015 |
| Tradar Homes Limited | Construction | 2025 |
| Trinity Heating Ltd | Construction | 2020 |
| Tuscan Court Limited | Households | 2002 |
| Twist and Dreadlocks Masters Ltd | Other services | 2026 |
| Two and Two a Limited | Extraterritorial | 1990 |
| UC Convergence Ltd | Administrative & support | 2012 |
| UK Lapidaries Limited | Manufacturing | 2024 |
| UK Social Events Ltd | Arts & recreation | 2023 |
| Unbelieve AI Ltd | Information & communication | 2025 |
| Unity Maintenance Solutions Limited | Construction | 2017 |
| Unspoken Ltd | Information & communication | 2020 |
| Untangled Thinking Limited | Professional & scientific | 2025 |
| Usama Razi Limited | Health & social care | 2025 |
| Used Catering Equipment Limited | Manufacturing | 2022 |
| V Star Events Ltd | Hospitality | 2025 |
| Vantage House (Sussex) Ltd | Wholesale & retail | 2013 |
| VBL Events Ltd | Arts & recreation | 2025 |
| Vdub Venture Ltd | Wholesale & retail | 2025 |
| Vegan Earthlings Limited | Hospitality | 2018 |
| Victoria Thomas Wellness and Yoga Limited | Education | 2021 |
| Vidhara Enterprise Ltd | Health & social care | 2022 |
| Vortiq Systems Ltd | Information & communication | 2026 |
| Wagstaff Holdings Ltd | Households | 2019 |
| Wasp Printers Limited | Manufacturing | 2008 |
| Wava Hill Properties Ltd | Real estate | 2025 |
| WE Take Calls Ltd | Administrative & support | 2023 |
| Webstudio Tech Ltd | Information & communication | 2025 |
| Wellwood Building Limited | Construction | 2024 |
| Wellwood Carpentry Ltd | Manufacturing | 2025 |
| Wendover Grange Residents Association Limited | Households | 1959 |
| Westview Electrical Ltd | Construction | 2019 |
| Wild Monkeys Childcare Limited | Education | 2014 |
| Wild Soul Surf Co. Limited | Manufacturing | 2021 |
| Wingin' IT Ltd | Hospitality | 2025 |
| Wisewhale Ltd | Professional & scientific | 2026 |
| Woffinden Lets Limited | Real estate | 2019 |
| Wonder MUM Cleaning Ltd | Administrative & support | 2024 |
| Xela Property Investment Ltd | Real estate | 2020 |
| Y the Yemeni Coffee Co Ltd | Hospitality | 2020 |
| YDN Store Ltd | Wholesale & retail | 2024 |
| Your Training Bank Limited | Administrative & support | 2016 |
| Ypcarpentry & Construction Ltd | Construction | 2025 |
| Zana Textiles Ltd | Wholesale & retail | 2023 |