| T Hawkins Accountancy Services Ltd | Professional & scientific | 2023 |
| T I Boutique Limited | Other services | 2017 |
| T J Construction (Sussex) Limited | Construction | 2007 |
| T J Mann Limited | Real estate | 2015 |
| T N Technical Services Ltd | Manufacturing | 2024 |
| T Pynn Electrical Ltd | Construction | 2018 |
| T&G Project Management Limited | Professional & scientific | 2014 |
| T&S Trading Eastbourne Ltd | Wholesale & retail | 2013 |
| T&T Construction Services Ltd | Construction | 2020 |
| T.Cox and SON Limited | Professional & scientific | 1956 |
| T.H.F Limited | Wholesale & retail | 2023 |
| TA Collective Ltd | Other services | 2021 |
| Table Talk Limited | Extraterritorial | 1997 |
| Table Warfare Limited | Manufacturing | 2010 |
| Tack-Tech's Limited | Construction | 2014 |
| Tadley Dental Care Ltd | Health & social care | 2021 |
| Tadtax Limited | Professional & scientific | 2005 |
| Tahilla Communications Limited | Arts & recreation | 2003 |
| Tahilla Conferences Limited | Professional & scientific | 2003 |
| Taiga Capital (UK) Limited | Administrative & support | 2022 |
| Tailorlynk Technologies Ltd | Wholesale & retail | 2023 |
| Tailormadecarpentry&Building Ltd | Construction | 2025 |
| Take the Space C.I.C. | Arts & recreation | 2016 |
| Takeway Ltd | Hospitality | 2019 |
| Takoda Media Corp Ltd | Professional & scientific | 2021 |
| Talk Gardens Limited | Other services | 2023 |
| Talkcyber Limited | Information & communication | 2015 |
| Talli T Limited | Professional & scientific | 2024 |
| Talos Executive Search Ltd | Administrative & support | 2024 |
| Talric Limited | Real estate | 2018 |
| Tamara Mckinley Limited | Information & communication | 2001 |
| Tamsiki Limited | Health & social care | 2018 |
| Tandem Publishing Limited | Information & communication | 2019 |
| Tander Renovations Ltd | Construction | 2024 |
| Tanglewood Create Ltd | Manufacturing | 2021 |
| Taniya Rana Ltd | Health & social care | 2021 |
| Tansleys Printers Limited | Manufacturing | 2008 |
| Tanya London Limited | Wholesale & retail | 2016 |
| Tapsells Limited | Manufacturing | 2010 |
| Taqwa Halal Butchers Limited | Wholesale & retail | 2018 |
| Tara D Conway Estates Ltd | Real estate | 2025 |
| Tara D Conway Holdings Ltd | Financial services | 2025 |
| Tara D Conway Ltd | Health & social care | 2025 |
| Tara Treatment and Diagnostics Limited | Health & social care | 2013 |
| Tarakasima Limited | Manufacturing | 2020 |
| TAT Air Limited | Construction | 2016 |
| Tattoo Morningstar Ltd | Other services | 2019 |
| Tavern Street Dental Practice Ltd | Health & social care | 2020 |
| Tavistock Eastbourne RTM Company Limited | Households | 2004 |
| Taxation Options Limited | Administrative & support | 2009 |
| Taxation Specialists Limited | Professional & scientific | 1989 |
| Taylor Fit OUT Ltd | Construction | 2012 |
| Taylor-Lake Partners Ltd | Administrative & support | 2025 |
| Taylorswinebar Limited | Hospitality | 2018 |
| Tayton Medical Ltd | Health & social care | 2022 |
| Tazarurwa Limited | Health & social care | 2012 |
| TB Inns Berwick Ltd | Hospitality | 2024 |
| TB Inns Ltd | Hospitality | 2023 |
| TC Consultants Limited | Professional & scientific | 2020 |
| TCG Partners Limited | Financial services | 2017 |
| TD SJ Dentistry Ltd | Health & social care | 2022 |
| TE Nosce Marketing Limited | Professional & scientific | 1996 |
| Tea Trade Estates Limited | Real estate | 2004 |
| TEA23 Ltd | Wholesale & retail | 2015 |
| Team Endeavour (UK) Limited | Construction | 2009 |
| Teamstats.Net Limited | Information & communication | 2008 |
| Tech Country Pest Control Ltd | Administrative & support | 2024 |
| Tech Country Property Management Ltd | Real estate | 2026 |
| Tech Country Property Services Ltd | Administrative & support | 2025 |
| Techmix Ltd | Wholesale & retail | 2026 |
| Technique Installations Ltd | Construction | 2008 |
| Technology Solutions Network Limited | Information & communication | 2025 |
| Techresort Community Interest Company | Information & communication | 2023 |
| Tecnik Limited | Information & communication | 2019 |
| Tectonic Digital Systems Limited | Construction | 2002 |
| TED Farriery Services Ltd | Agriculture & fishing | 2021 |
| TED Hudson Way Limited | Households | 2026 |
| Teddy James Mortgage Solutions Limited | Financial services | 2022 |
| Teddys Ventures Limited | Administrative & support | 2026 |
| Tee-Rific Ltd | Hospitality | 2025 |
| Teepeebee Limited | Professional & scientific | 2020 |
| Teeth and Bones Limited | Health & social care | 2021 |
| Tego Digital Ltd | Information & communication | 2026 |
| Tehranflame Ltd | Hospitality | 2025 |
| Tekdev Limited | Professional & scientific | 2019 |
| Teknicare Limited | Information & communication | 1999 |
| TEL Aesthetics Ltd | Other services | 2014 |
| Telco IT Limited | Information & communication | 2010 |
| Telco Properties Limited | Real estate | 2025 |
| Telecom Direct Limited | Wholesale & retail | 2013 |
| Telecom Property Group Ltd | Extraterritorial | 2022 |
| Tellurium Consulting Ltd | Professional & scientific | 2017 |
| Templar Developments Limited | Construction | 2011 |
| Templar Finishes Ltd | Construction | 2024 |
| Temple Consultancy Limited | Health & social care | 1997 |
| Templeman Consulting 2.0 Limited | Information & communication | 2024 |
| TEN66 Media Limited | Information & communication | 2020 |
| TEN66 Prints Ltd | Manufacturing | 2021 |
| Tenco Training Limited | Health & social care | 2014 |
| Tender Hearts Homecare Ltd | Health & social care | 2023 |