| Southern IT Limited | Information & communication | 1998 |
| Southern Scaffolding Limited | Construction | 2015 |
| Southern Stone Ltd | Construction | 2010 |
| Southfarm Stables Ltd | Agriculture & fishing | 2026 |
| Southfield Consulting (UK) Limited | Professional & scientific | 2011 |
| Southpaw Communications Limited | Professional & scientific | 1989 |
| Southwood AFS Limited | Professional & scientific | 2014 |
| Southwood Windows Kent Ltd | Construction | 2025 |
| Southworth Reward Consulting Ltd | Administrative & support | 2026 |
| Sovereign International Limited | Wholesale & retail | 1990 |
| Sovereign Resilience Finance Investment Advisors Limited | Professional & scientific | 2025 |
| SP Trading PVT Ltd | Wholesale & retail | 2025 |
| SP3 Plus Ltd | Manufacturing | 2008 |
| Spa Aluminium Holdings Limited | Financial services | 2019 |
| Spa Aluminium Properties Limited | Real estate | 2019 |
| Spa Communications Consultancy Limited | Professional & scientific | 2003 |
| Space Decorating Ltd | Construction | 2026 |
| Space FIN Limited | Financial services | 2014 |
| Space Marketing Limited | Professional & scientific | 2006 |
| Space Ukone Limited | Real estate | 2010 |
| Spaceman Brand Ltd | Professional & scientific | 2018 |
| Spafta Ltd | Extraterritorial | 2025 |
| Spanish Point Partners Limited | Professional & scientific | 2020 |
| Sparkha Ltd | Information & communication | 2025 |
| Sparkle Carpet Cleaner & Upholstery Cleaner Tunbridge Wells Kent Limited | Administrative & support | 2024 |
| Sparkserve Limited | Construction | 2023 |
| Sparkworx Ltd | Construction | 2019 |
| Speared Moon Ltd | Information & communication | 2020 |
| Special Gifts by GEO Ltd | Wholesale & retail | 2022 |
| Specialist Diagnostic Pathology Laboratory Limited | Health & social care | 2016 |
| Specialist Fuel Tank Services Ltd | Administrative & support | 2021 |
| Spectraclad Ltd | Construction | 2019 |
| Spectrum - E H C S Limited | Administrative & support | 2001 |
| Spectrum Electrical & Building Ltd | Construction | 2024 |
| Speed 6724 Limited | Households | 1998 |
| Speeds Farm Maintenance Company Limited | Arts & recreation | 1976 |
| Speeds Farm Management Company Limited | Households | 2021 |
| Speldhurst Place Management Co. Ltd. | Households | 2019 |
| Speldhurst Services Limited | Professional & scientific | 2016 |
| Spencerdwellings Limited | Households | 2025 |
| Spfb Limited | Financial services | 2004 |
| Spice Business Limited | Hospitality | 2023 |
| Spice Quay Management Co. Limited | Households | 1997 |
| Spider Project Management Ltd. | Construction | 2014 |
| Spider Quantity Surveying Ltd | Professional & scientific | 2021 |
| Spider Vehicle Enhancement Ltd | Wholesale & retail | 2013 |
| Spindlebury Limited | Administrative & support | 1994 |
| Spiral Software Ltd | Information & communication | 2021 |
| Spirit Bear Coaching Ltd | Information & communication | 2025 |
| Spks Property LLP | | 2025 |
| Splendid IT Global Consulting Ltd | Information & communication | 2016 |
| Spoon & Rice Franchising Ltd | Hospitality | 2019 |
| Spoon & Rice Ltd | Hospitality | 2019 |
| Sports Massage Hub Ltd | Arts & recreation | 2018 |
| Sports Sites Limited | Information & communication | 2024 |
| Sportsland Academy Limited | Arts & recreation | 2023 |
| Spotted Dog PUB Ltd | Hospitality | 2025 |
| Spring Cleaning TW Ltd | Administrative & support | 2015 |
| Spring Vale Court Management Company Limited | Households | 1994 |
| Springbok Business Solutions Limited | Professional & scientific | 2023 |
| Springfield Business Consultants Limited | Professional & scientific | 2006 |
| Springing Dragon Limited | Professional & scientific | 2007 |
| Springrange Property Investments Limited | Real estate | 2003 |
| Springshaw Court Management Company Limited | Households | 1997 |
| Sprocket Rocket Soho Limited | Information & communication | 2003 |
| Square Mile Trading Ltd | Professional & scientific | 2010 |
| Square Way Properties Limited | Real estate | 2024 |
| SR Fire Limited | Public administration | 2023 |
| SR Fitness Limited | Arts & recreation | 2019 |
| SRB Quantum Limited | Professional & scientific | 2016 |
| Srgm Holdings Ltd | Administrative & support | 2010 |
| SRS UK Services Limited | Professional & scientific | 2012 |
| SS2 Group Limited | Agriculture & fishing | 2013 |
| SSD Access & Inspection Limited | Professional & scientific | 2012 |
| SSJ Investments Limited | Real estate | 2018 |
| Sswp Limited | Real estate | 2011 |
| ST Brelade Limited | Health & social care | 2023 |
| ST George's Childcare Limited | Health & social care | 2024 |
| ST John's Field Residents Management Company Limited | Households | 2002 |
| ST John's Road (East Grinstead) Management Company Limited | Households | 2007 |
| ST Johns Nurseries (Kirby Bellars) Limited | Agriculture & fishing | 2007 |
| ST Johns Road Residents Limited | Households | 2007 |
| ST Marks Consulting Limited | Professional & scientific | 2012 |
| ST Michael's Hill Management Limited | Households | 1997 |
| ST. James Court (Wood Street) Management Company Limited | Real estate | 2015 |
| ST. James Park Management Company Limited | Real estate | 1973 |
| Stage Manager Ltd | Arts & recreation | 2023 |
| Stagestep Limited | Extraterritorial | 2014 |
| Stalisfield Investments Limited | Financial services | 1993 |
| Stamsmead Limited | Real estate | 1988 |
| Stanbrook House Residents Association Limited | Households | 1999 |
| Standen Commercial Flooring Ltd | Construction | 2026 |
| Stangroom Consulting Limited | Information & communication | 2015 |
| Stanmoor Limited | Administrative & support | 1999 |
| Star Analytics Ltd | Information & communication | 2026 |
| Star DRY Cleaner Ltd | Other services | 2023 |
| Star Mews Management Company Limited | Real estate | 1995 |
| Starland Entertainments Limited | Information & communication | 1992 |
| Starline (Transport) Limited | Real estate | 1971 |
| Starnes (Edenbridge) Limited | Real estate | 2004 |