| Sandgate Hill Residents Association Limited | Households | 2018 |
| Sandgate Kitchen Ltd | Hospitality | 2026 |
| Sandgate Road Commercial Ltd | Real estate | 2026 |
| Sandgate White Lodge Limited | Households | 1974 |
| Sandstone Court Limited | Households | 1996 |
| Sandv Ltd | Hospitality | 2025 |
| Sandwich Montessori Limited | Education | 2026 |
| Sandy PAW Lodge Limited | Hospitality | 2023 |
| Sangnima Ltd | Real estate | 2026 |
| SAP Services Ltd | Energy | 2006 |
| Sara Upton Design Ltd | Information & communication | 2025 |
| Sarah B Williams Ltd | Information & communication | 2012 |
| Satelys Limited | Information & communication | 2014 |
| Sateo Ltd | Health & social care | 2020 |
| Saturn Solutions Limited | Manufacturing | 1998 |
| Saunders Hoists & Stairlifts Ltd | Manufacturing | 2024 |
| Savvydrive Ltd | Information & communication | 2026 |
| Sayanara Limited | Wholesale & retail | 2024 |
| Scaling UP Services Limited | Administrative & support | 2013 |
| SCC Facilities Ltd | Wholesale & retail | 2022 |
| Scholar Search Ltd | Professional & scientific | 2025 |
| School Gallery Ltd | Manufacturing | 2023 |
| Scilto Ltd | Professional & scientific | 2023 |
| Scoop Therapy Ltd | Wholesale & retail | 2026 |
| Scott Ritchie Telecoms Ltd | Information & communication | 2016 |
| Scraegg UK Distribution Ltd | Manufacturing | 2018 |
| Screen South | Information & communication | 2001 |
| Scribblers & Daubers Ltd | Arts & recreation | 2016 |
| Scully Media Ltd | Information & communication | 2023 |
| SD Ghar Ltd | Real estate | 2023 |
| SE Collectibles Ltd | Wholesale & retail | 2025 |
| Sea Lady Events Ltd | Arts & recreation | 2025 |
| Sea Lady Management Company Limited | Households | 2019 |
| Seabrook Road Limited | Construction | 2016 |
| Seacrest Stroud Limited | Information & communication | 2026 |
| Seagull Bidco Limited | Professional & scientific | 2025 |
| Seagull's Rest Folkestone Limited | Hospitality | 2023 |
| Sealasite Limited | Construction | 2008 |
| Searle Developments Limited | Real estate | 2013 |
| Seaside Hosts Ltd | Hospitality | 2018 |
| Seaview Accounting Ltd | Professional & scientific | 2012 |
| Seaview Property Holdings Ltd | Real estate | 2018 |
| Seaview Property SPV2 Ltd | Real estate | 2018 |
| Seaview Studio Ltd | Arts & recreation | 2017 |
| Second Season Clothing Limited | Wholesale & retail | 2026 |
| Secondary Modern Ltd | Wholesale & retail | 2019 |
| SEH Consult Ltd | Professional & scientific | 2026 |
| SEK Group Services Limited | Information & communication | 2022 |
| SEK Technical Services Ltd | Professional & scientific | 2020 |
| Selenite Moon Limited | Other services | 2022 |
| Semet Ltd | Real estate | 2021 |
| Sene Valley Golf Club Limited | Arts & recreation | 2024 |
| Senior Building Contractors Limited | Construction | 2024 |
| Sennen Cove Financial Limited | Administrative & support | 2021 |
| Serene IT Ltd | Information & communication | 2014 |
| Serenity Retreat & Massage Limited | Other services | 2017 |
| Services Facilities Management Limited | Administrative & support | 2024 |
| SES Electrical Installation and Maintenance Ltd | Construction | 2018 |
| Setrans Limited | Wholesale & retail | 2003 |
| Seven Seas Hythe Limited | Households | 2013 |
| Seven W Brown Ltd | Real estate | 2025 |
| Sevenoaks Hearing Care Centre Limited | Health & social care | 2014 |
| SFF Strength and Conditioning Limited | Health & social care | 2012 |
| SFP Cleaning Services Ltd | Administrative & support | 2023 |
| SH BIM Solutions Ltd. | Construction | 2017 |
| SH Property Kent Ltd | Real estate | 2024 |
| SHA Consultancy Services Ltd | Professional & scientific | 2025 |
| Shador Consult Ltd | Professional & scientific | 2026 |
| Shador Investments Ltd | Real estate | 2020 |
| Shaina West Ltd | Arts & recreation | 2023 |
| Shakespeare House Residents Limited | Households | 1994 |
| Shakespeare Solutions Ltd. | Information & communication | 2002 |
| Shane Record Ltd | Arts & recreation | 2008 |
| Shanghai Inn Limited | Hospitality | 2022 |
| Shardana Cafe Bar Ltd | Hospitality | 2021 |
| Sheltered Living Ltd | Construction | 2011 |
| Shepway Ceramics (Wholesalers) Limited | Wholesale & retail | 1980 |
| Shepway Commercial Ltd | Construction | 2007 |
| Shepway Electrical Services Installation & Maintenance Ltd | Construction | 2022 |
| Shepway Property Management Ltd | Construction | 2026 |
| Shepway Spectrum Arts Community Interest Company | Administrative & support | 2019 |
| Shepway Taxis Ltd | Transport & logistics | 2023 |
| Shepway TCG Ltd | Wholesale & retail | 2025 |
| Shepway Teaching Schools Ltd | Education | 2011 |
| Shepway Traffic Products Limited | Transport & logistics | 2013 |
| Shesells Seashells Ltd | Hospitality | 2023 |
| Shex Saman Limited | Other services | 2024 |
| Shieldwall Games Ltd | Extraterritorial | 2020 |
| Shift Coaching and Development Limited | Professional & scientific | 2016 |
| Shift Coaching Limited | Professional & scientific | 2018 |
| Shingle Shore Ltd | Households | 2024 |
| Shiva Property Investment Ltd | Real estate | 2022 |
| Shoes 2000 Limited | Hospitality | 1999 |
| SHOP4SCOUTS Ltd | Wholesale & retail | 2010 |
| Shore (Hythe) RTM Company Limited | Households | 2023 |
| Shorncliffe Auto Repairs Limited | Transport & logistics | 2005 |
| Shorncliffe Properties Limited | Real estate | 2020 |
| Shorncliffe Stores Ltd | Wholesale & retail | 2022 |
| Shree Balaji Couriers Ltd | Transport & logistics | 2024 |
| Shrim Jewelry UK Limited | Wholesale & retail | 2025 |