| Solvency II Solutions Ltd. | Information & communication | 2014 |
| Soma & Solace Ltd | Health & social care | 2025 |
| Somers Hotels Limited | Hospitality | 1981 |
| Sonu Traders Ltd | Wholesale & retail | 2013 |
| Sophia Grace Properties Ltd | Real estate | 2020 |
| SOS Procurement Limited | Construction | 2019 |
| Soul of Brazil Ltd | Hospitality | 2025 |
| Soul Street LON UK Ltd | Hospitality | 2025 |
| Soulstreets Ltd | Hospitality | 2026 |
| Sound Play Theatre Productions Limited | Arts & recreation | 2022 |
| South Croydon Motorcycles Ltd | Wholesale & retail | 2025 |
| South Croydon Takeaway Ltd | Hospitality | 2018 |
| South London Accountants Ltd | Professional & scientific | 2025 |
| South London Assets Ltd | Real estate | 2015 |
| South London Estate Properties Limited | Real estate | 2013 |
| South London Property Investments Ltd | Real estate | 2017 |
| Southdown Engineering Limited | Professional & scientific | 2013 |
| Southern Heating Services Ltd | Construction | 2001 |
| Southern Motor Services Ltd | Wholesale & retail | 2024 |
| Southgold Homes ( Godstone Place) Limited | Construction | 2022 |
| Southgold Homes (the Orchard) Limited | Real estate | 2021 |
| Southgold Homes Limited | Construction | 2003 |
| Southgold Limited | Construction | 1991 |
| Spa Consulting Services Ltd | Professional & scientific | 2012 |
| Space FOX Studios Limited | Manufacturing | 2022 |
| Spanish Tony Media Ltd | Wholesale & retail | 2021 |
| Sparklyn Cleaning Ltd | Administrative & support | 2024 |
| Spearing Films Ltd | Information & communication | 2021 |
| Speech Energy Ltd | Financial services | 2017 |
| Spencer & Co. Homes Limited | Construction | 2025 |
| Spenge Ltd | Information & communication | 2023 |
| SPG Facilities Ltd | Administrative & support | 2019 |
| SPH Performing Arts Limited | Education | 2022 |
| Spice & Tandoori Limited | Hospitality | 2024 |
| Spice Food Village Ltd | Hospitality | 2025 |
| Spice Hub 25 Ltd | Hospitality | 2025 |
| Spice N Ice Limited | Hospitality | 2019 |
| Spike Imaging Ltd | Professional & scientific | 2011 |
| Spike Lights Limited | Construction | 2003 |
| Spirit of Arabia Limited | Extraterritorial | 2005 |
| Splash Plumbers Ltd | Construction | 2021 |
| Splash Spaces Ltd | Real estate | 2026 |
| Spoga Ltd | Education | 2019 |
| Spoorthi Consulting Ltd | Professional & scientific | 2018 |
| Spreadbase Systems Limited | Professional & scientific | 2009 |
| Springboard Enterprises Limited | Professional & scientific | 2008 |
| Springett Elite Services Ltd | Construction | 2016 |
| Squarecut Solutions 2 312 Ltd | Real estate | 2025 |
| Squarecut Solutions 37 Ltd | Real estate | 2025 |
| Squarecut Solutions 55 D Ltd | Real estate | 2025 |
| Squarecut Solutions 58 E Ltd | Real estate | 2025 |
| Squarecut Solutions 76 1 Ltd | Real estate | 2025 |
| Squarecut Solutions 76 4 Ltd | Real estate | 2025 |
| Squarecut Solutions 76 5 Ltd | Real estate | 2025 |
| Squarecut Solutions Ltd | Real estate | 2025 |
| Sraha Maternity Ltd | Health & social care | 2013 |
| SRG Electrical Limited | Construction | 2007 |
| SRI Venkateswara Balaji Temple | Other services | 2013 |
| Srinivas Consultancy Ltd | Information & communication | 2020 |
| SS Catering CR2 Ltd | Hospitality | 2025 |
| SSA Property Investments Limited | Real estate | 2022 |
| SSG Southern Ltd | Construction | 2022 |
| SSL Cool Cuts Ltd | Other services | 2022 |
| Ssnt Ltd | Information & communication | 2026 |
| SSS Investments 2014 Limited | Real estate | 2014 |
| ST George's Walk DRY Cleaners Limited | Other services | 2020 |
| ST James Hygiene Services Ltd | Health & social care | 2026 |
| ST Michael Care Ltd | Health & social care | 2023 |
| Stadt Electric Ltd | Manufacturing | 2025 |
| Stag Civil Engineering Ltd | Construction | 1990 |
| Stag Court RTM Company Limited | Households | 2023 |
| Staines Creative Limited | Information & communication | 2018 |
| Stalsa Ltd | Real estate | 2019 |
| Stanimaka Ltd | Hospitality | 2024 |
| Star Gourmet Private Limited Limited | Hospitality | 2025 |
| Star Kitchen Limited | Hospitality | 2025 |
| Starcleanse Limited | Other services | 2018 |
| Starcrest Trading Ltd | Wholesale & retail | 2026 |
| Stargrazing Co. Catering Limited | Hospitality | 2019 |
| START2FINISH Event Management Limited | Other services | 2006 |
| Starting Care Limited | Hospitality | 2012 |
| State on Demand Ltd | Extraterritorial | 2019 |
| Static Electrical Ltd | Construction | 2021 |
| Station Cafe (Horley) Limited | Hospitality | 2020 |
| Station Coffee Limited | Hospitality | 2023 |
| Station Fish Tadworth Limited | Hospitality | 2020 |
| Stayci Limited | Information & communication | 2023 |
| Staycleandailyproducts Ltd | Manufacturing | 2025 |
| Stealth Fire & Security Limited | Administrative & support | 2007 |
| Stede Close (South Croydon) Management Company Limited | Households | 2018 |
| Steel & Company Developments Ltd. | Construction | 2007 |
| Steel Homes Construction Ltd | Construction | 2013 |
| Steftech Ltd | Information & communication | 2025 |
| Stella Talent Management Limited | Extraterritorial | 2019 |
| Stenko Ltd | Wholesale & retail | 2019 |
| Stephen Hudd Limited | Administrative & support | 2014 |
| Steve Upson Holdings Limited | Professional & scientific | 2017 |
| Stewart Davis Estates Ltd | Real estate | 2018 |
| Stickmay Limited | Households | 1980 |
| Stitch & Blossom Ltd | Extraterritorial | 2025 |