| Swift Spray Foam Removal Ltd | Administrative & support | 2025 |
| Switch Financial Network Ltd | Financial services | 2021 |
| Sycamore Joinery (UK) Limited | Construction | 2015 |
| Sycamore Sprayers (UK) Ltd | Construction | 2020 |
| Sylvarna Holdings Limited | Financial services | 2023 |
| Symsoft Consulting Limited | Information & communication | 2009 |
| Synergetic Corporation Limited | Professional & scientific | 2002 |
| Synergy Land and Property Limited | Construction | 2016 |
| Syntegration Limited | Professional & scientific | 2007 |
| System 910 (Hydraulics) Limited | Manufacturing | 1992 |
| Sytech Security Limited | Administrative & support | 2008 |
| T & E Holdings Ltd | Professional & scientific | 2024 |
| T & E Management Ltd | Wholesale & retail | 2016 |
| T & E Properties (Sussex) Ltd | Real estate | 2024 |
| T a Millard Ltd | Construction | 2023 |
| T a Tooling Ltd | Manufacturing | 2003 |
| T Box on the Hill Ltd | Hospitality | 2011 |
| T Drake Roofing Services Limited | Construction | 2012 |
| T J Sanders Electrical Ltd | Construction | 2024 |
| T Jones & SON Developments Limited | Construction | 2003 |
| T Stewart Inspection Ltd | Professional & scientific | 2012 |
| T W W Property Limited | Construction | 1999 |
| T&C Property Services Sussex Ltd | Construction | 2024 |
| T&P Tree Surgery and Landscaping Ltd | Administrative & support | 2015 |
| T&T Southern Motors Ltd | Wholesale & retail | 2022 |
| T.H.L. Property Services Limited | Construction | 2013 |
| T.Norris Marine Ltd | Wholesale & retail | 2022 |
| T10 Automotive Ltd | Professional & scientific | 2016 |
| T@ Group Ltd | Hospitality | 2020 |
| TAC9 Protection Ltd | Administrative & support | 2026 |
| Tactical Distributors Ltd | Wholesale & retail | 2025 |
| TAG Rugby U.K. Ltd. | Wholesale & retail | 1994 |
| Tagit Scaffold Inspections UK Ltd | Construction | 2014 |
| Tailored Technical Solutions Ltd | Administrative & support | 2023 |
| Take 5 Digital Limited | Arts & recreation | 2018 |
| Talent Finders Worldwide Ltd | Professional & scientific | 2017 |
| Talent Thrive Consulting Ltd | Professional & scientific | 2024 |
| Talk Independent Limited | Financial services | 2001 |
| Talking Headsets Limited | Wholesale & retail | 2000 |
| Tall MAN With Glasses Ltd | Professional & scientific | 2014 |
| Tallis Wealth Management Ltd | Financial services | 2016 |
| Talon Operating Ltd | Information & communication | 2014 |
| Tamarind Tree Consulting Ltd | Professional & scientific | 2017 |
| Tamec Limited | Manufacturing | 2000 |
| Tammy Housing Ltd | Agriculture & fishing | 2024 |
| Tandem Invoice Finance Limited | Financial services | 2009 |
| Tangerine Castles Limited | Real estate | 2002 |
| Tangmere Airfield Nurseries Ltd | Agriculture & fishing | 1988 |
| Tangmere Military Aviation Museum Trust Limited | Arts & recreation | 1987 |
| Tangmere Museum Trading Company Limited | Wholesale & retail | 2018 |
| Tangmere Property LLP | | 2020 |
| Tangmere Tower and Gardens CIC | Education | 2023 |
| Tanshire Management Ltd | Real estate | 2015 |
| Tappit Media Limited | Information & communication | 2011 |
| Tarriana LEE Ltd | Wholesale & retail | 2014 |
| Task Angels Holdings Ltd | Other services | 2022 |
| Task Angels Ltd | Households | 2010 |
| Tasoulla Hair & Beauty Ltd | Other services | 2020 |
| Tass Assets Ltd | Real estate | 2022 |
| Taste of Saigon LLP | | 2024 |
| Tasty Beast Limited | Wholesale & retail | 2016 |
| Tate Properties (Bognor Regis) Limited | Construction | 1961 |
| Tate Renewable Services Limited | Construction | 2024 |
| Tate Technical Holdings Ltd | Financial services | 2023 |
| Tate Technical Properties Ltd | Real estate | 2023 |
| Tate Technical Services Limited | Energy | 2012 |
| Taught AI Ltd | Information & communication | 2025 |
| TAV Gardens Limited | Wholesale & retail | 2025 |
| TAW Property Group Ltd | Real estate | 2026 |
| TAW Property Ltd | Real estate | 2026 |
| Tawny Touring Limited | Hospitality | 2014 |
| Tax Technical Training Ltd | Education | 2014 |
| Tayka Ltd | Professional & scientific | 2017 |
| Taylor & Co Tax Services Limited | Professional & scientific | 2013 |
| Taylor 2 Recruitment Ltd. | Administrative & support | 2007 |
| Taylor Bradshaw Associates Limited | Professional & scientific | 2009 |
| Taylor Chester Associates Ltd | Professional & scientific | 2003 |
| Taylor Motorsport Limited | Wholesale & retail | 2025 |
| TB Lining Services Ltd | Water & waste | 2026 |
| TBE Design Management Ltd | Professional & scientific | 2016 |
| Tboy Studios Limited | Wholesale & retail | 2021 |
| TC Building Control Ltd | Professional & scientific | 2020 |
| TCB Consulting (Sussex) Ltd | Administrative & support | 2024 |
| TCB Property (Sussex) Limited | Real estate | 2025 |
| TCK East ST Ltd | Construction | 2016 |
| TCS (Education) Limited | Wholesale & retail | 1991 |
| TCW Capital Holdings Ltd | Other services | 2023 |
| TD2 Promotions Ltd | Administrative & support | 2020 |
| Team Bonbon Ltd | Information & communication | 2012 |
| Team Rüdi Ltd | Wholesale & retail | 2025 |
| Teamivism Ltd | Professional & scientific | 2020 |
| Tech Fire Ltd | Wholesale & retail | 2019 |
| Techfix Chichester Ltd | Other services | 2026 |
| Technically Crewed Company Ltd. | Administrative & support | 2002 |
| Techno Accessories Ltd | Wholesale & retail | 2026 |
| Technology (UK) Limited | Information & communication | 1999 |
| Technology Innovation Group Limited | Professional & scientific | 2015 |
| Tecnologica Limited | Information & communication | 2004 |
| TED Construction & Developments Limited | Construction | 2017 |
| TED Griffin Plumbing & Heating Ltd | Other services | 2017 |