| THE Really Good Bar Company Ltd | Hospitality | 2010 |
| THE Really Interesting Food Company Limited | Manufacturing | 1996 |
| THE Replacement Lightbulb Company Brighton Limited | Construction | 2015 |
| THE Retreat Aldwick Ltd | Other services | 2022 |
| THE Right Five LLP | | 2022 |
| THE Rooms (Worthing) Limited | Real estate | 2019 |
| THE Rottingdean Garage Limited | Wholesale & retail | 2013 |
| THE Rouse Partnership Ltd | Administrative & support | 2003 |
| THE Rutland Dog Hotel Limited | Hospitality | 2022 |
| THE Sampford Courtenay Community Interest Company | Transport & logistics | 2021 |
| THE Sand Project Ltd | Education | 2017 |
| THE Savery Group Limited | Professional & scientific | 2012 |
| THE Scouting Game Ltd | Arts & recreation | 2023 |
| THE Seaview (East Preston) Hospitality Ltd | Hospitality | 2022 |
| THE Seaview (East Preston) Ltd | Hospitality | 2022 |
| THE Seventeenth Collective Ltd | Real estate | 2020 |
| THE Shore Skin Clinic Ltd | Health & social care | 2018 |
| THE SID Youth CIC | Education | 2021 |
| THE Single Step Company Limited | Information & communication | 2026 |
| THE Sipping House Limited | Hospitality | 2021 |
| THE Smart Softwash Company Ltd | Administrative & support | 2018 |
| THE Snug Coffee & Kitchen Ltd | Hospitality | 2025 |
| THE Solderman Limited | Wholesale & retail | 2006 |
| THE Stables at Cissbury Horse Sales Limited | Agriculture & fishing | 2023 |
| THE Stables at Cissbury Limited | Agriculture & fishing | 2023 |
| THE Strand Worthing Development Limited | Construction | 2019 |
| THE Structure Group of Companies Limited | Construction | 1997 |
| THE Stupendium Limited | Information & communication | 2019 |
| THE Stylists Agency Ltd | Professional & scientific | 2019 |
| THE Sumptuous Company Limited | Wholesale & retail | 2025 |
| THE Supplier Group Ltd | Wholesale & retail | 2024 |
| THE Sussex Cardiac Clinic Limited | Health & social care | 2014 |
| THE Sussex Kitchen Company Limited | Wholesale & retail | 2025 |
| THE Sussex Webstore Ltd | Wholesale & retail | 2021 |
| THE T. Field Company Limited | Real estate | 2016 |
| THE Tax Lady Ltd | Professional & scientific | 2022 |
| THE Three Crowns (Wisborough Green) Ltd | Hospitality | 2020 |
| THE Throne Holdings Limited | Information & communication | 2018 |
| THE Tidy Home Cleaning Company Ltd | Administrative & support | 2026 |
| THE Tiger Group Consultancy Ltd | Administrative & support | 2022 |
| THE Till Limited | Administrative & support | 2001 |
| THE Timber Double Glazing Company Ltd | Manufacturing | 2025 |
| THE TIN Snail Company Limited | Wholesale & retail | 1991 |
| THE TOG Boutique Limited | Wholesale & retail | 2024 |
| THE Tonizzo Consultancy Limited | Professional & scientific | 2016 |
| THE Trafalgar Investment Partnership LLP | | 2023 |
| THE Valley Bar Limited | Hospitality | 2008 |
| THE Vapour Room (Littlehampton) Limited | Wholesale & retail | 2016 |
| THE Velo Coffee Co Ltd | Hospitality | 2021 |
| THE Verandah Goring Limited | Hospitality | 2025 |
| THE View 70 Limited | Hospitality | 2016 |
| THE Village Estate Agency Limited | Extraterritorial | 2007 |
| THE Vineyard Store Ltd | Wholesale & retail | 2017 |
| THE Walk Productions Limited | Arts & recreation | 2019 |
| THE Waterfront Inn Shanklin Limited | Hospitality | 2014 |
| THE WAV Venue Ltd | Arts & recreation | 2026 |
| THE Wealth Portal Ltd | Information & communication | 2024 |
| THE Welbeck Clinic (Cosmetic) Ltd | Health & social care | 2014 |
| THE Welbeck Clinic Ltd | Health & social care | 2024 |
| THE Welded Tandem Picture Company Limited | Information & communication | 2008 |
| THE Wellbeing Collaborative C.I.C. | Health & social care | 2022 |
| THE Wellderness CIC | Education | 2021 |
| THE Window DR Ltd | Construction | 2012 |
| THE Windsor Clinic Ltd | Health & social care | 2003 |
| THE Wingrove Family Limited | Information & communication | 2020 |
| THE Wolf and the PEA Ltd | Wholesale & retail | 2013 |
| THE Wolsey Hotel (Worthing) Limited | Hospitality | 2009 |
| THE Wonderbus | Arts & recreation | 2007 |
| THE Woolly PIG Restaurant Ltd | Hospitality | 2025 |
| THE Works Group Developments Ltd | Real estate | 2024 |
| THE Worthing Clinic Ltd | Health & social care | 2021 |
| THE Worthing Well Ltd | Hospitality | 2022 |
| THE Zoomies Hub Ltd | Wholesale & retail | 2025 |
| Thecreativetalkscompany Limited | Administrative & support | 2010 |
| Theel Ltd | Extraterritorial | 2019 |
| Thema AI Limited | Information & communication | 2017 |
| Thembanani Ltd | Health & social care | 2021 |
| Themeborne Ltd | Manufacturing | 2016 |
| Theo Handen Marketing Ltd | Other services | 2007 |
| Theoliviasaurusrex Ltd | Information & communication | 2026 |
| Therapeia Homes Limited | Health & social care | 2025 |
| Therisen Ltd | Wholesale & retail | 2024 |
| Therm Energy Limited | Professional & scientific | 2004 |
| Thermal Surfaces Limited | Extraterritorial | 2015 |
| Thermometers UK Limited | Manufacturing | 2005 |
| Thesip Ltd | Other services | 2025 |
| Think Change Consulting Ltd | Professional & scientific | 2012 |
| Think Exceptionally Ltd | Professional & scientific | 2016 |
| Thinking Visuals Limited | Information & communication | 2023 |
| Third Barn Properties Limited | Real estate | 2015 |
| This Must BE the Place Limited | Administrative & support | 2018 |
| This Rocks Ltd | Professional & scientific | 2026 |
| Thistle and ASH Limited | Transport & logistics | 2021 |
| THL Accountancy Ltd | Professional & scientific | 2021 |
| Tho-Rho Limited | Construction | 2025 |
| Thomas Leese Fifa Services Ltd | Arts & recreation | 2020 |
| Thomas Murphy Marine Ltd | Other services | 2022 |
| Thomasj Trading Ltd | Hospitality | 2025 |
| Thompson.Holt Limited | Other services | 2005 |
| Thorn Data Solutions Limited | Information & communication | 2024 |