| ST. John's (Canterbury) Property Management Ltd. | Households | 2015 |
| ST. Mary's Court Herne Bay Limited | Households | 2001 |
| Stablegate Mews Management Company Limited | Professional & scientific | 2008 |
| Stace Associates Limited | Administrative & support | 2003 |
| Stan S Food Ltd | Hospitality | 2025 |
| Standard Quay Stage Ltd | Other services | 2025 |
| Standard Quay Tearoom Ltd | Hospitality | 2017 |
| Staple Farm Mews Management Company Limited | Households | 1988 |
| Star Clothing Designs Ltd | Wholesale & retail | 2018 |
| Star LAM Kitchen Ltd | Hospitality | 2024 |
| Stark Contemporary Limited | Arts & recreation | 2003 |
| Starle Close Management Limited | Households | 1995 |
| Starlight Cards Ltd | Wholesale & retail | 2026 |
| Starmead Financial Solutions Ltd | Professional & scientific | 2007 |
| Starry Kent Limited | Wholesale & retail | 2016 |
| Start 2 Drive HGV Limited | Education | 2015 |
| Startright Brickwork Limited | Construction | 2017 |
| Starz Automotive Ltd | Wholesale & retail | 2024 |
| Station Kebab House Ltd | Hospitality | 2019 |
| Station Garage Sales Limited | Wholesale & retail | 2003 |
| Station Road Management Services Ltd | Real estate | 2025 |
| Station Taxis Canterbury Limited | Transport & logistics | 2024 |
| Steel FAB Engineering Limited | Administrative & support | 2009 |
| Steel Financial Solutions Ltd | Professional & scientific | 2025 |
| Stefanf Limited | Transport & logistics | 2025 |
| Stelling Lodge Education & Therapy Ltd | Education | 2025 |
| Stems and Balls Ltd | Wholesale & retail | 2023 |
| Stepan Driving Ltd | Other services | 2019 |
| Stephenson's Speech and Language Therapy Limited | Health & social care | 2014 |
| Steps Psychology Ltd | Education | 2025 |
| Stereonow Limited | Administrative & support | 2007 |
| Sterling Communications Limited | Professional & scientific | 2018 |
| Steve Manion Effective Training Limited | Education | 2015 |
| Steven James Hairdressing Canterbury Ltd | Administrative & support | 2016 |
| STG Freight Ltd | Transport & logistics | 2022 |
| Stick Media Ltd | Information & communication | 2018 |
| Stirling Michavila Ltd | Households | 2022 |
| Stirling Plumbing & Bathrooms Ltd | Construction | 2023 |
| STL Ethos Ltd | Professional & scientific | 2020 |
| STN Construction Ltd | Construction | 2026 |
| Stolby Investments Limited | Real estate | 2021 |
| Stolby Limited | Construction | 2019 |
| Stoldev Limited | Real estate | 2015 |
| Stone Link Ltd | Manufacturing | 2021 |
| Stonebrook Estates (Holdco) Limited | Financial services | 2024 |
| Stonebrook Investments Limited | Real estate | 2024 |
| Stonebrook Properties Limited | Construction | 2012 |
| Stoneridge Roofing Ltd | Construction | 2025 |
| Stoneset Management Limited | Arts & recreation | 2002 |
| Stoneswift Limited | Professional & scientific | 2022 |
| Stonewells Integrated Project Services Limited | Professional & scientific | 2021 |
| Stoneyleys LLP | | 2023 |
| Stornoway Grey Limited | Construction | 2017 |
| Story Studio Ltd | Professional & scientific | 2020 |
| Stour Court Residents Co. Limited | Households | 1979 |
| Stour House Group Limited | Health & social care | 2026 |
| Stour House Opco Limited | Health & social care | 2026 |
| Stour House Propco Limited | Health & social care | 2026 |
| Stour Property Maintenance Ltd | Construction | 2024 |
| Stour Roofline Limited | Construction | 2021 |
| Stour Valley Business Park Limited | Administrative & support | 1982 |
| Stour Valley Developments Limited | Administrative & support | 2007 |
| Stour Valley Estates Limited | Administrative & support | 1999 |
| Stour Valley Motor Company Limited | Wholesale & retail | 2010 |
| Stourbridge Consulting Limited | Information & communication | 2026 |
| Stourside Management Company Limited | Households | 1993 |
| Strand Kent Ltd | Manufacturing | 2026 |
| Strata Shopfitting Solutions Ltd | Administrative & support | 2012 |
| Strategic Talent Ltd | Administrative & support | 2018 |
| Strategy&Consult Professional Services Ltd | Information & communication | 2024 |
| Stratland Consultancy Limited | Administrative & support | 2015 |
| Stratton Group Limited | Administrative & support | 2002 |
| Stratton HR Ltd. | Administrative & support | 2006 |
| Stratton Resourcing Limited | Professional & scientific | 2006 |
| Stratus Bridge Partners Ltd | Information & communication | 2025 |
| Streamline Health Limited | Professional & scientific | 2008 |
| Streek Holdings Ltd | Administrative & support | 2026 |
| Street Panna Limited | Professional & scientific | 2020 |
| Streets Ahead Collective C.I.C. | Education | 2025 |
| Stressed Executive Limited | Health & social care | 2023 |
| Stripy Lawns Limited | Administrative & support | 2006 |
| Striqo Ltd | Information & communication | 2019 |
| Stroud Consulting Limited | Professional & scientific | 2001 |
| Stroud Marinex Ltd | Professional & scientific | 2025 |
| Structural Design Services (South East) Limited | Professional & scientific | 2014 |
| Stuart Court (Canterbury) Limited | Extraterritorial | 2006 |
| Stuart Stanley Ltd | Construction | 2013 |
| Stuc-Trolley.Uk Ltd | Wholesale & retail | 2025 |
| Stud Ukeuro LLP | | 2009 |
| Studi-Oh! Graphics Limited | Information & communication | 2026 |
| Studio 568 Ltd | Information & communication | 2023 |
| Studio BOB Group Ltd | Information & communication | 2024 |
| Studio Clague LLP | | 2020 |
| Studio Jetset Ltd | Construction | 2026 |
| Studio Knight Limited | Professional & scientific | 2026 |
| Studio Milnes Ltd | Manufacturing | 2025 |
| Studio Nova Kent Ltd | Construction | 2024 |
| Studio Smile Ltd | Professional & scientific | 2018 |
| Studio Viridis Limited | Professional & scientific | 2025 |
| Sturry Ltd | Hospitality | 2017 |