| South East Walls & Ceilings Limited | Construction | 2002 |
| South London Land Limited | Real estate | 2006 |
| South Meadows Belford Ltd | Construction | 2021 |
| South Meadows Management Limited | Real estate | 2025 |
| South of the Ferry Riverside Association Limited | Households | 1988 |
| South Street Investments Limited | Real estate | 2016 |
| South Street Management Company Limited | Households | 1962 |
| Southern Fast Foods Limited | Professional & scientific | 1970 |
| Southern Line Markings Limited | Construction | 2019 |
| Southern Tech Invest Ltd | Extraterritorial | 2014 |
| Southwest Handyman Ltd | Construction | 2015 |
| SP (2004) Limited | Construction | 2004 |
| Space Case Ltd | Manufacturing | 2010 |
| Space Dimensionally Optimized Technology Satellites Ltd | Professional & scientific | 2021 |
| Space Futures International Limited | Professional & scientific | 2026 |
| Spark & Clark Ltd | Construction | 2017 |
| Spark Sports Ltd | Education | 2022 |
| Sparkings Ltd | Transport & logistics | 2017 |
| Sparxs Digital Ltd | Information & communication | 2017 |
| Spatialqc Limited | Information & communication | 2002 |
| Special Kreactions Ltd | Professional & scientific | 2023 |
| Specialist Complete Security Systems Ltd | Administrative & support | 2011 |
| Specialist Door Solutions Ltd | Manufacturing | 2001 |
| Specialist Leak Detection Ltd | Construction | 2019 |
| Specialty Coating Systems Limited | Manufacturing | 1979 |
| Spectra Gases Limited | Extraterritorial | 1992 |
| Spectrum Decor Ltd | Construction | 2022 |
| Speedbird Ventures Limited | Wholesale & retail | 2026 |
| Speeder Property Services LLP | | 2014 |
| Speedx Courier Ltd | Transport & logistics | 2025 |
| Spenser Residential Ltd | Real estate | 2024 |
| Spevack Ltd | Financial services | 2010 |
| SPH Catering Ltd | Hospitality | 2023 |
| Spice Origin Ltd | Wholesale & retail | 2015 |
| Spiezia Organics Limited | Manufacturing | 2003 |
| Spirit Fitness Clothing Limited | Wholesale & retail | 2025 |
| Spirit Technologie Ltd | Other services | 2013 |
| SPJ Building Services Limited | Construction | 2020 |
| Splat Cards Limited | Manufacturing | 2025 |
| Splendid Properties Limited | Extraterritorial | 2013 |
| Sportiff UK PVT Ltd | Wholesale & retail | 2025 |
| Sporting Solutions (Middlesex) Ltd | Arts & recreation | 2022 |
| Sports Injury Solutions Ltd | Arts & recreation | 2021 |
| Spot on With Numbers Ltd | Information & communication | 2018 |
| Spotlesshome (Surrey) Ltd | Administrative & support | 2017 |
| Spots and Stripes Limited | Construction | 2002 |
| Spring Leaf Search Ltd | Administrative & support | 2010 |
| Sprint Travel Limited | Transport & logistics | 2000 |
| Sprinthaul Logistics & Removals Ltd | Transport & logistics | 2025 |
| Spruce Properties Limited | Financial services | 2018 |
| Spurhill Associates Ltd | Professional & scientific | 2018 |
| Spurtech Limited | Wholesale & retail | 2023 |
| Squashh Larder Ltd | Wholesale & retail | 2025 |
| Squashh Ltd | Hospitality | 2021 |
| Squisito Food Ltd | Hospitality | 2009 |
| Squixl Consulting Ltd | Information & communication | 2022 |
| SR Squared Ltd | Construction | 2021 |
| SR Technology Ltd | Information & communication | 2020 |
| Sran Holdings Limited | Financial services | 2024 |
| Srebmit Ltd | Manufacturing | 2022 |
| Sree Mahadevar Ltd | Real estate | 2023 |
| Sregalbrook Services Ltd | Administrative & support | 2024 |
| SRH Service & MOT Ltd | Professional & scientific | 2026 |
| SRI Devi Holding Ltd | Real estate | 2025 |
| SRI Devi Stores Ltd | Wholesale & retail | 2019 |
| SS Embryology Ltd | Health & social care | 2024 |
| SS Property Investment 10 Ltd | Real estate | 2023 |
| SSR Media Limited | Manufacturing | 2012 |
| ST Georges Court (Plymouth) Limited | Health & social care | 2012 |
| ST John Square Property Limited | Real estate | 1971 |
| ST John's Lodge Freehold Company Limited | Professional & scientific | 2009 |
| ST John's Vmha | Other services | 2010 |
| ST Johns Freehold Ltd | Households | 2024 |
| ST Lawrence Court (Freehold) Limited | Real estate | 2016 |
| ST Martins Mews Freehold Limited | Households | 2002 |
| ST Patrick's (Potters Lane) Ltd. | Construction | 2018 |
| ST Peter's Charity | Administrative & support | 2018 |
| ST Thomas More Preschool Ltd | Education | 2023 |
| ST. Andrews Properties Ltd. | Construction | 1993 |
| ST. James House (Woking) Limited | Households | 1997 |
| ST. John's Hill House Limited | Households | 2004 |
| ST. Lawrence Court (Chobham) Management Company Limited | Administrative & support | 1988 |
| ST. Martins Rowley Bristow Management Company Limited | Households | 1995 |
| ST. Mary's House (York Road) Management Co. Limited | Real estate | 1976 |
| ST. Nicholas Rowley Bristow Management Company Limited | Households | 1995 |
| Stag River Limited | Professional & scientific | 2020 |
| Stairfactory Limited | Extraterritorial | 2015 |
| Stallwood Building Services Limited | Construction | 2005 |
| Stan A&N Limited | Construction | 2021 |
| Standout CV Ltd | Information & communication | 2018 |
| Stanko Electrics Limited | Construction | 2015 |
| Stanley Park Music Ltd | Arts & recreation | 2018 |
| Star (Student Action for Refugees) | Other services | 2000 |
| Star Bridge Interior Limited | Construction | 2024 |
| Stark Systems Limited | Information & communication | 2025 |
| Starlett Miniatures Ltd | Wholesale & retail | 2023 |
| Starmart Ltd | Information & communication | 2006 |
| Starspace Limited | Information & communication | 2024 |
| Starspeed Limited | Transport & logistics | 1978 |
| Starwood Cars Limited | Transport & logistics | 2025 |