| Solid Base Builders Ltd | Construction | 2025 |
| Soloartist Collaborations Ltd | Arts & recreation | 2026 |
| Solomon Collis Limited | Real estate | 2020 |
| Solvea Limited | Other services | 2017 |
| Somun Limited | Financial services | 2026 |
| Sonav Ltd | Real estate | 2026 |
| Sophie Brown Communications Limited | Professional & scientific | 2016 |
| Sorelle Studio Ltd | Other services | 2025 |
| Sorted Care Ltd | Health & social care | 2022 |
| Sorted Foods and Beverages Ltd | Wholesale & retail | 2022 |
| Sorted Healthcare Training Ltd | Education | 2024 |
| Sourcing Pro Recruitment Ltd | Administrative & support | 2023 |
| Southern Coastal Realty Ltd | Real estate | 2016 |
| Southwark Pubs Limited | Hospitality | 2017 |
| Spacon Developments Limited | Real estate | 2004 |
| Spacon Limited | Construction | 2003 |
| Sparkles Cleaning & Maintenance Services Ltd | Administrative & support | 2003 |
| Sparks Eletrical Limited | Construction | 2016 |
| Spartan Athletic Limited | Arts & recreation | 2014 |
| Specialist Hygiene Services Limited | Professional & scientific | 1978 |
| Specsheight Solutions Limited | Information & communication | 2010 |
| Speed-Trap Holdings Limited | Information & communication | 2000 |
| Spelthorne Gymnastics | Arts & recreation | 2016 |
| Spence Heating Limited | Construction | 2014 |
| Spicy Bento Ltd | Hospitality | 2023 |
| Spiral Signs Ltd | Administrative & support | 2013 |
| Spot on Search Limited | Administrative & support | 2024 |
| Sprint Commercials Ltd | Wholesale & retail | 2007 |
| SRG Project Consultancy Ltd | Professional & scientific | 2022 |
| SRI DS Ltd | Transport & logistics | 2022 |
| SRI DS Trading Ltd | Wholesale & retail | 2023 |
| SS-03-23 Limited | Real estate | 2023 |
| SSI Consultancy Limited | Professional & scientific | 2024 |
| ST Leger Engineering Ltd | Professional & scientific | 2019 |
| ST Sebastian's Court Management Co. Limited | Households | 2004 |
| ST. Paul's Trading Limited | Education | 1996 |
| Starlight Haulage Limited | Transport & logistics | 2015 |
| Steggles Cleaning Ltd | Administrative & support | 2025 |
| Sterling Support Solutions Ltd | Information & communication | 2023 |
| Steven Butson Estimating (SBE) Limited | Construction | 2012 |
| Stewart House RTM Company Ltd | Households | 2017 |
| Stirlingwell Capital Ltd | Professional & scientific | 2025 |
| STL Lofts & Extensions Ltd | Construction | 2024 |
| Stocce Consulting Ltd | Professional & scientific | 2024 |
| Stone Artois Ltd | Information & communication | 2025 |
| Storhouse Limited | Wholesale & retail | 2020 |
| Stormcat Limited | Information & communication | 2021 |
| Strategic IT Solutions Limited | Information & communication | 2023 |
| Street Scoops Ltd | Hospitality | 2026 |
| Studio Cubic Ltd | Professional & scientific | 2016 |
| STUDIO19 Limited | Information & communication | 2018 |
| Sumatra Arzue Limited | Information & communication | 2007 |
| Sumo Outdoor Limited | Wholesale & retail | 2019 |
| Sunbury Court Island Residents Association Ltd | Households | 2010 |
| Sunbury Ferry Ltd | Transport & logistics | 2021 |
| Sunbury Homecare Limited | Health & social care | 2023 |
| Sunbury Landscape & Build Ltd | Construction | 2024 |
| Sunbury Management Ltd | Administrative & support | 2025 |
| Sunbury Meal Limited | Hospitality | 2022 |
| Sunbury Mews Garages Limited | Households | 2024 |
| Sunbury PUB Co Ltd | Arts & recreation | 2026 |
| Sunburyx Hair & Beauty Ltd | Other services | 2025 |
| Suncross Limited | Households | 1997 |
| Sunmead Consultancy Limited | Other services | 2015 |
| Sunny Nails & Spa 141B Ltd | Other services | 2023 |
| Sunrise Estate Planning Ltd | Financial services | 2026 |
| Sunrise Financial Ltd | Financial services | 2019 |
| Sunrise Management Services Ltd | Households | 2025 |
| Sunshine Sunbury Care Ltd | Health & social care | 2024 |
| Superluxe Limited | Wholesale & retail | 2023 |
| Superwave Ltd | Information & communication | 2019 |
| Supply and Commercial Improvement Ltd | Information & communication | 2019 |
| Supplyhavenenterprice Ltd | Wholesale & retail | 2025 |
| Surface Performance Ltd | Professional & scientific | 2012 |
| Surplus to Supper (Trading) Limited | Hospitality | 2023 |
| Surrey Medical Solutions Ltd | Health & social care | 2012 |
| Surrey Raffle House Limited | Other services | 2019 |
| Surrey Solar Installers Ltd | Construction | 2023 |
| Surrey Surface Repair Ltd | Other services | 2025 |
| Surveyly Ltd | Construction | 2025 |
| Susha Foods Limited | Hospitality | 2024 |
| Suswa Ltd | Wholesale & retail | 2026 |
| SV Holdco Limited | Financial services | 2024 |
| SVN Food (Milehouse) Ltd | Hospitality | 2024 |
| SVN Food Ltd | Hospitality | 2022 |
| SW3 Projects Limited | Other services | 2006 |
| Swiftbasket Trading Ltd | Wholesale & retail | 2025 |
| Sygnet Construction Ltd | Construction | 2020 |
| Sygnet London Ltd | Construction | 2021 |
| Syke Social Ltd | Professional & scientific | 2025 |
| Syla Damproofing Ltd | Construction | 2026 |
| Sylkon Sparkles Limited | Administrative & support | 2025 |
| Synchro Clutch Company Limited | Professional & scientific | 1979 |
| Synoid IT Limited | Information & communication | 2023 |
| Syntora Ltd | Wholesale & retail | 2025 |
| T & E Trading Limited | Transport & logistics | 2004 |
| T&I Roofing Ltd | Construction | 2019 |
| T.A.L.K Partnership Ltd | Professional & scientific | 2019 |
| T.R. Technology Limited | Information & communication | 2007 |
| Takehiro Ikeda Ltd | Professional & scientific | 2025 |