| SO Plan Ltd | Information & communication | 2026 |
| Soames Walk Limited | Professional & scientific | 2015 |
| Social and Sustainable Capital Investments II Limited | Professional & scientific | 2022 |
| Social and Sustainable Capital Investments Limited | Professional & scientific | 2012 |
| Social and Sustainable Capital LLP | | 2012 |
| Social and Sustainable Housing II Holdco Limited | Financial services | 2022 |
| Social and Sustainable Housing II LP | | 2022 |
| Social and Sustainable Housing LP | | 2019 |
| Social and Sustainable Living Investments Limited | Professional & scientific | 2025 |
| Social and Sustainable Living L.P. | | 2026 |
| Sofarsolar UK Limited | Wholesale & retail | 2022 |
| Sofia House Management Company Limited | Households | 2004 |
| Solar Additions Limited | Professional & scientific | 2016 |
| Solar Vitality Accessories Limited | Wholesale & retail | 2024 |
| Solaraz Limited | Professional & scientific | 2026 |
| Solidcraft Technologies Ltd | Information & communication | 2024 |
| Solitaire Consultancy UK Ltd | Education | 2025 |
| Soluxa Technologies Ltd | Information & communication | 2025 |
| Solvink Consulting Ltd | Professional & scientific | 2022 |
| Soma Trade Ltd | Wholesale & retail | 2025 |
| Sonali RAO Training & HR Consultancy Ltd | Administrative & support | 2015 |
| Song Bros Ltd | Administrative & support | 2025 |
| Song Enterprise Ltd | Wholesale & retail | 2010 |
| Song Trading Ltd | Wholesale & retail | 2018 |
| Sophia YAN Limited | Real estate | 2023 |
| Sote Global Ltd | Hospitality | 2024 |
| Sound Space Studios LLP | | 2026 |
| Sound Story Ltd | Information & communication | 2024 |
| Soundarababu Limited | Construction | 2020 |
| South Coast Offices Ltd | Construction | 2015 |
| South London Alliance Church | Other services | 2004 |
| Southern Heating Solutions Ltd | Construction | 2025 |
| Southlodge Knightsbridge Management Limited | Households | 1979 |
| Spark DAO Limited | Education | 2022 |
| Sparkhound Studios Ltd | Professional & scientific | 2026 |
| Sparklydesire Ltd | Wholesale & retail | 2025 |
| Spartan Scenery Ltd | Construction | 2019 |
| Speed Energy Holdings Ltd | Wholesale & retail | 2025 |
| Speedline International Company Limited | Professional & scientific | 2016 |
| Spice Express KT3 Ltd | Hospitality | 2025 |
| Spiral Scenery Limited | Information & communication | 2013 |
| Spirit Builders Limited | Construction | 2012 |
| SPL Global Sourcing Limited | Wholesale & retail | 2016 |
| Spoke Innovation Ltd | Professional & scientific | 2012 |
| Spotless Restoration Limited | Construction | 2025 |
| Springs Trading Limited | Wholesale & retail | 2019 |
| Spykd Enterprise Limited | Wholesale & retail | 2024 |
| SQ Development Limited | Real estate | 2025 |
| SR Tuition Limited | Education | 2015 |
| SRI ICT Solutions Ltd | Information & communication | 2013 |
| Srinanda Limited | Health & social care | 2010 |
| Sriven Ltd | Real estate | 2021 |
| SRY Developments Construction Ltd | Construction | 2022 |
| SS Best Food Ltd | Wholesale & retail | 2020 |
| Ssamm Ltd | Real estate | 2021 |
| SSF Express Ltd | Transport & logistics | 2025 |
| Sskk Takeaway Ltd | Hospitality | 2025 |
| Ssooni Ltd | Wholesale & retail | 2018 |
| SSS 2020 Ltd | Real estate | 2020 |
| SSS Commercial Limited | Real estate | 2012 |
| SSS D&B Limited | Construction | 2019 |
| ST Ann's Recruitment Ltd | Health & social care | 2012 |
| ST Business & HR Services Limited | Construction | 2016 |
| ST Davids Property Investment and Management Limited | Households | 2024 |
| ST Executive Management Limited | Administrative & support | 2018 |
| ST Michael's Property Assets Limited | Real estate | 2020 |
| ST. DER Ltd | Hospitality | 2022 |
| ST. John's Rise Management Company Limited | Households | 1995 |
| ST. Mark's Road Property Management Company Ltd | Households | 2009 |
| ST. Wang Ltd | Hospitality | 2013 |
| Stack-It Services Ltd | Transport & logistics | 2024 |
| Stack-It Solutions Limited | Transport & logistics | 2025 |
| Stad Limited | Wholesale & retail | 2020 |
| Statim Build Ltd | Professional & scientific | 2020 |
| Stay Travel Ltd | Transport & logistics | 2019 |
| STB Boxing Limited | Arts & recreation | 2022 |
| Steeple Court (Wimbledon) Residents Association Limited | Households | 1970 |
| Stefano DI Feratti Ltd | Manufacturing | 2022 |
| Stellar Horizon Ltd | Professional & scientific | 2018 |
| Step Right Health Ltd | Health & social care | 2026 |
| Steponme Ltd | Other services | 2023 |
| Stepping Stones Properties Limited | Real estate | 2013 |
| Sterkur Limited | Wholesale & retail | 2018 |
| Sterling Healthcare Group Ltd | Health & social care | 2020 |
| Stig's Gardens Limited | Administrative & support | 2020 |
| STK Consultancy Limited | Information & communication | 2021 |
| Stoggieline Ltd | Wholesale & retail | 2023 |
| Stoke Share Ltd | Information & communication | 2022 |
| Stone & Brick Construction Limited | Construction | 2017 |
| STONED91 Ltd | Construction | 2024 |
| Straight Arrow Services Limited | Information & communication | 2018 |
| Straightwhitesmile Ltd | Health & social care | 2026 |
| Strayz Ltd | Wholesale & retail | 2025 |
| Streamtime Software Limited | Information & communication | 2008 |
| Stress Matters Ltd | Other services | 2018 |
| Stride Running Limited | Manufacturing | 2025 |
| Strike N Shred Ltd | Education | 2025 |
| Structure Smith Ltd | Construction | 2025 |
| Studiera Ltd | Education | 2026 |
| Studio Exception Limited | Professional & scientific | 2020 |