| THE Village Shop Upper Dicker (Sussex) Limited | Real estate | 2025 |
| THE Village Shop Upper Dicker Ltd | Wholesale & retail | 2006 |
| THE VR (Burgess Hill) Limited | Wholesale & retail | 2022 |
| THE Wealden CNC Company Ltd | Wholesale & retail | 2020 |
| THE Wellbeing and Performance Company Limited | Education | 2018 |
| THE White Hart Horsebridge Limited | Hospitality | 2017 |
| THE White Horse BSG Ltd | Hospitality | 2022 |
| THE Wilmington Hotel Limited | Hospitality | 2019 |
| THE Wine Warehouse Sussex Limited | Wholesale & retail | 2024 |
| THE YEW Tree Inn (Chalvington) Limited | Extraterritorial | 2004 |
| Thefineartcompany.Co.Uk Limited | Wholesale & retail | 2002 |
| Thenvi Limited | Professional & scientific | 2012 |
| Therajet Medicare LLP | | 2019 |
| Thermic Edge Coatings Limited | Manufacturing | 2016 |
| Thermic Edge Limited | Manufacturing | 2003 |
| Thermtech Renewables Limited | Construction | 2024 |
| Thiad Games Limited | Manufacturing | 2020 |
| Think Possible Psychology Ltd | Professional & scientific | 2017 |
| Thistlemead Limited | Information & communication | 2015 |
| Thorhammer 3D Limited | Manufacturing | 2023 |
| Thorndale Furnishers Limited | Wholesale & retail | 2003 |
| Three 2 Five Club Limited | Wholesale & retail | 2025 |
| Three 6T Coaching Ltd | Administrative & support | 2018 |
| Threeways (Sussex) Ltd | Construction | 2018 |
| Tiara (Sussex) Limited | Financial services | 2020 |
| Tiger Fencing & Landscaping Ltd | Construction | 2017 |
| Tiger Rose Limited | Wholesale & retail | 2018 |
| Tiger Tax Limited | Extraterritorial | 2020 |
| Tiger Wealth Management Ltd | Extraterritorial | 2023 |
| Tile Factor Ltd | Wholesale & retail | 2009 |
| TIM Nicholls Yacht Services Limited | Transport & logistics | 2005 |
| TIM Wilson Properties Limited | Real estate | 2012 |
| Tim@Orchard-Construction Limited | Construction | 2025 |
| Timbertech Solutions Limited | Construction | 2025 |
| Timothy Powell Limited | Professional & scientific | 2012 |
| Tintwise Limited | Wholesale & retail | 2025 |
| Tivoli Auto Services Limited | Wholesale & retail | 2014 |
| TJ & KJ Properties LLP | | 2020 |
| TJ & LE Properties LLP | | 2020 |
| TJ & MA Properties LLP | | 2020 |
| TJ & MC Properties LLP | | 2020 |
| TJO PCM Investments Limited | Real estate | 2015 |
| Tjos Holdings Limited | Financial services | 2024 |
| Tjot Holdings Limited | Financial services | 2024 |
| TJS Business Services Ltd | Professional & scientific | 2021 |
| TJS Motor Services Ltd | Wholesale & retail | 2025 |
| TJW Investments Limited | Financial services | 2023 |
| TJW Tree Services Ltd | Administrative & support | 2023 |
| TKM Partners Limited | Professional & scientific | 2025 |
| TLH 1 Limited | Professional & scientific | 2025 |
| Tliw Limited | Hospitality | 2012 |
| TLP Building Services Limited | Construction | 2003 |
| Tlwr Ltd | Professional & scientific | 2017 |
| TM Exterior Maintenance Ltd | Construction | 2025 |
| TMH E Bikes Ltd | Wholesale & retail | 2025 |
| TOM Moffett Ltd | Real estate | 2021 |
| TOM Thumb Nursery Limited | Public administration | 2005 |
| Toman Homes Ltd | Real estate | 2026 |
| Tony Norman Music Limited | Arts & recreation | 2013 |
| Toothworks Limited | Health & social care | 2009 |
| Top Line Investments Ltd | Real estate | 2021 |
| Topline Electronics Limited | Manufacturing | 1986 |
| Topline Group Limited | Manufacturing | 2015 |
| Topping Services Ltd | Agriculture & fishing | 2021 |
| Torres Enterprises Ltd | Hospitality | 2021 |
| Torvik Investments Limited | Real estate | 2025 |
| TOS Consultancy Ltd | Other services | 2018 |
| Toska Sussex Limited | Construction | 2020 |
| Totalworks Group Limited | Administrative & support | 2024 |
| Town & Country Landscapes Limited | Professional & scientific | 2000 |
| Town and Country Property Solutions Limited | Real estate | 2013 |
| TPF Electrical Contractors Ltd | Construction | 2021 |
| TPR Property Solutions Limited | Professional & scientific | 2020 |
| Trace Holdings Limited | Financial services | 2018 |
| Trade Counter Mate Limited | Construction | 2022 |
| Trade Counter Mate Swindon Ltd | Construction | 2019 |
| Trading Made Easy Limited | Wholesale & retail | 2013 |
| Trading-Telecom Limited | Information & communication | 2022 |
| Traframe Ltd | Manufacturing | 2020 |
| Trail Escape Limited | Arts & recreation | 2023 |
| Training Assist Limited | Administrative & support | 2004 |
| Trainsharp Cycling Limited | Arts & recreation | 2011 |
| Transformative Culture Consultancy Global Ltd | Administrative & support | 2024 |
| Treadwell Holdings Ltd | Financial services | 2014 |
| Tricca Consulting Limited | Information & communication | 2014 |
| Tricky Cards Limited | Information & communication | 2025 |
| Trident Aesthetics Limited | Other services | 2017 |
| Trinity Content Partners Ltd. | Information & communication | 2015 |
| Trinity Developments Limited | Professional & scientific | 1999 |
| Tripleacodes.Com Limited | Information & communication | 2008 |
| Trojan Packaging Ltd | Administrative & support | 2021 |
| True North Alliance Limited | Professional & scientific | 2019 |
| Trufflepig Films Limited | Information & communication | 2008 |
| Trust in Vesta Limited | Real estate | 2025 |
| Trust Wealth Limited | Financial services | 2024 |
| Trustco Group Services Limited | Extraterritorial | 2003 |
| Trustco PLC. | Information & communication | 1997 |
| TTI Testing Limited | Professional & scientific | 1996 |
| Tudor History Tours Limited | Administrative & support | 2009 |
| Tugwell Developments Ltd | Construction | 2018 |