| Sussex Equestrian Centre Limited | Agriculture & fishing | 2003 |
| Sussex House Right to Manage Company Limited | Households | 2016 |
| Sussex Lawn Treatment Services Ltd | Administrative & support | 2020 |
| Sussex Marine Services Ltd | Professional & scientific | 2011 |
| Sussex Small Business Marketing (Ssbm) Ltd | Professional & scientific | 2020 |
| Sussex Timber Supplies Ltd | Wholesale & retail | 2016 |
| Swanrose Avon Street Ltd | Construction | 2026 |
| Swanrose Developments Ltd | Construction | 2025 |
| Swanrose Property Group Ltd | Real estate | 2024 |
| Swans Ghyll Property Ltd | Real estate | 2025 |
| Sweet & Stripe Limited | Wholesale & retail | 2011 |
| Sweet Leaf Ltd | Information & communication | 2013 |
| Swing Clean Golf Ltd | Administrative & support | 2024 |
| Swing Zone Golf Ltd | Arts & recreation | 2025 |
| Swishco Ltd. | Information & communication | 2006 |
| Switched on Electrical Ltd | Construction | 2019 |
| Swmstudios Ltd | Information & communication | 2021 |
| Swordley & Company Limited | Professional & scientific | 2019 |
| Swot Social Media Limited | Professional & scientific | 2018 |
| Swyft Recruitment Limited | Administrative & support | 2016 |
| Synergy Creative Community C.I.C. | Administrative & support | 2015 |
| Synergy Electrical Services London Ltd | Construction | 2018 |
| Synodicit Limited | Information & communication | 2022 |
| System Rope Access Ltd | Construction | 2023 |
| Szatmary Project Limited | Administrative & support | 2024 |
| T a & S E Hollom Limited | Financial services | 2004 |
| TA Cole & Co Ltd | Administrative & support | 2024 |
| Tacal’S Taco’S Ltd | Hospitality | 2024 |
| Tagzvondeni Kennels & Cattery Ltd | Agriculture & fishing | 2017 |
| Tailormade Travel and Adventures Limited | Administrative & support | 2019 |
| Taipan Global Ltd | Information & communication | 2024 |
| Talbot Students Limited | Administrative & support | 2014 |
| Talentum Digital Ltd | Administrative & support | 2025 |
| Talentway International Ltd | Education | 2024 |
| Tamplin Grave Digging Services Limited | Other services | 2023 |
| Tamplin Groundworks Limited | Administrative & support | 2024 |
| Tandridge Limited | Real estate | 2014 |
| Tangolace Ltd | Wholesale & retail | 2019 |
| Tanko Consulting Ltd | Extraterritorial | 2023 |
| Tapstore (UK) Limited | Wholesale & retail | 2012 |
| Tar@Na Group Ltd | Wholesale & retail | 2026 |
| Targetloc Ltd | Information & communication | 2009 |
| Taxxi Cabs Limited | Transport & logistics | 2025 |
| Teamstar Ltd | Administrative & support | 2004 |
| Tech Medic (Surrey) Ltd | Other services | 2022 |
| Technology Management Support Systems Ltd | Information & communication | 2009 |
| Tectrad U.S., Inc. | | 2004 |
| Teexho James Limited | Information & communication | 2025 |
| Telesmati Limited | Hospitality | 2020 |
| Temple Capital Management Ltd | Information & communication | 2024 |
| Tempus Nomen Ltd | Education | 2022 |
| TEN TEN Management Limited | Administrative & support | 2016 |
| Tennyson Capital Holdings Ltd | Financial services | 2025 |
| TEO Van DEN Broeke Limited | Information & communication | 2014 |
| Teos Consulting Ltd. | Information & communication | 2009 |
| Terraform Ltd | Arts & recreation | 2014 |
| Terrasylva Service Ltd | Information & communication | 2022 |
| Terreros Holdings Ltd | Financial services | 2025 |
| Tessier Labs Ltd | Wholesale & retail | 2019 |
| Testers Tree Surgeons Ltd | Administrative & support | 2017 |
| Tewin Hill Ltd | Real estate | 2020 |
| TH Construction (S.E.) Ltd | Construction | 2020 |
| Thai Emporium Ltd | Wholesale & retail | 2020 |
| THC Rental Ltd | Real estate | 2023 |
| THE Accountant Monk Ltd | Professional & scientific | 2024 |
| THE Accounts Bureau Ltd | Professional & scientific | 2016 |
| THE Ambient Partnership Group Limited | Financial services | 2018 |
| THE Art Sign Ltd | Information & communication | 2014 |
| THE Ashton Hill Group Limited | Construction | 2022 |
| THE Auto Splash Limited | Administrative & support | 2023 |
| THE Baby Tribe Ltd | Wholesale & retail | 2020 |
| THE Bar Choral Society | Education | 2014 |
| THE Bay House Production Limited | Information & communication | 2025 |
| THE Belfry Residents Association Limited | Households | 1988 |
| THE Bias CUT Limited | Wholesale & retail | 2015 |
| THE Bio-Pharma Consultancy Limited | Professional & scientific | 2007 |
| THE Blackland Foundation | Education | 2026 |
| THE Box by AMG Limited | Manufacturing | 2025 |
| THE Brand Team Ltd | Professional & scientific | 2005 |
| THE Bridge Bar Ltd | Hospitality | 2010 |
| THE Chef Thai Cuisine Limited | Hospitality | 2011 |
| THE Coffee House Turner Hill Limited | Wholesale & retail | 2026 |
| THE Colour Suite Limited | Professional & scientific | 2015 |
| THE CRE8TIVES Project Limited | Administrative & support | 2023 |
| THE Deanery Management Company Limited | Households | 2003 |
| THE Dolphin and Whale Connection Ltd | Administrative & support | 2017 |
| THE Dozen Media Ltd | Information & communication | 2023 |
| THE Enchanted Glade Limited | Health & social care | 2025 |
| THE END Point Security Ltd | Information & communication | 2023 |
| THE Environmental Land Company Limited | Real estate | 2001 |
| THE Essex Will Centre Limited | Professional & scientific | 1996 |
| THE Facial Rehabilitation Centre Limited | Other services | 2023 |
| THE Filled Churros Ltd | Manufacturing | 2024 |
| THE Foot Lady Limited | Health & social care | 2015 |
| THE Frow Show CIC | Arts & recreation | 2022 |
| THE Garden Cafe Felbridge Ltd | Hospitality | 2022 |
| THE Gilchrist Collection Ltd | Professional & scientific | 2020 |
| THE Goat Kitchen Ltd | Hospitality | 2020 |
| THE Grub Stop Limited | Hospitality | 2021 |
| THE Hobby Forge Ltd | Wholesale & retail | 2025 |