| SRI Agastya Ltd | Wholesale & retail | 2025 |
| Sringfield Properties (UK) Limited | Real estate | 2019 |
| SS Building & Renovations Ltd | Construction | 2022 |
| SS Horizon Homes Limited | Real estate | 2024 |
| SS Property Mgmt Limited | Real estate | 2020 |
| SS Tradework & Accessories Ltd | Professional & scientific | 2025 |
| Ssbcl Global Ltd | Administrative & support | 2025 |
| SSJ Visionary Ltd | Professional & scientific | 2021 |
| SSMC22 Events Ltd | Hospitality | 2025 |
| SSN Home Foods Ltd | Hospitality | 2026 |
| SSS Automobile Limited | Wholesale & retail | 2023 |
| SSS Transport Logistics Ltd | Transport & logistics | 2026 |
| Sssr Foods Ltd | Hospitality | 2024 |
| Ssss Brother Ltd | Wholesale & retail | 2024 |
| SST Management Consultant Ltd | Professional & scientific | 2025 |
| ST Construct Limited | Construction | 2025 |
| ST Helen Property Ltd | Real estate | 2021 |
| ST Helen Services Ltd | Health & social care | 2018 |
| ST3 Limited | Health & social care | 2020 |
| Stab Transport Limited | Transport & logistics | 2020 |
| Stabila Construction Ltd | Construction | 2026 |
| Stackdays Ltd | Wholesale & retail | 2025 |
| Staffomed Limited | Health & social care | 2025 |
| Stal Global Business (UK) Ltd | Wholesale & retail | 2009 |
| Stallionz Traders Ltd | Extraterritorial | 2020 |
| Stampartefact Ltd | Arts & recreation | 2022 |
| Stapleton Services Ltd | Public administration | 2026 |
| Star Auto Electric Ltd | Wholesale & retail | 2024 |
| Star Fish Kingdom Limited | Hospitality | 2026 |
| Star Ice Cream (BD) Ltd | Hospitality | 2019 |
| Star Icecream (GB) Limited | Wholesale & retail | 2012 |
| Star Legacy Catering Ltd | Hospitality | 2024 |
| Star Rider Ltd | Administrative & support | 2017 |
| Star Seller Ltd | Wholesale & retail | 2026 |
| Star Shisha Bar Ltd | Hospitality | 2021 |
| Star Temp Consultancy Services Limited | Manufacturing | 2015 |
| Star Wholesalers Ltd | Wholesale & retail | 2026 |
| Starbuilds Construction Ltd | Construction | 2026 |
| Stardust Linen Company Limited | Wholesale & retail | 2018 |
| Stark Innovations Ltd | Professional & scientific | 2019 |
| Starling Thames Services Limited | Information & communication | 2022 |
| Starlinq CIC | Administrative & support | 2024 |
| Starlite Linen Services Ltd | Other services | 2025 |
| Stars Light Housing Ltd | Real estate | 2025 |
| Start Assist Ltd | Wholesale & retail | 2015 |
| Statsprime Ltd | Health & social care | 2024 |
| Staydangerous Ltd | Information & communication | 2024 |
| Staymint Ltd | Hospitality | 2024 |
| Steel Tower Services Limited | Information & communication | 2011 |
| Steel-Rolling Elite Ltd | Manufacturing | 2025 |
| Steelacts Productions Limited | Arts & recreation | 2021 |
| Steer Sense Driving School Ltd | Education | 2024 |
| Stef-Pal Ltd | Professional & scientific | 2014 |
| Stelica Ciobanu Limited | Construction | 2022 |
| Stellant Limited | Information & communication | 2022 |
| Stellarsip Ltd | Wholesale & retail | 2025 |
| Steller Tech Ltd | Information & communication | 2022 |
| Stenrock Recruitment Co Ltd | Administrative & support | 2020 |
| Sterling & Co Motors Ltd | Wholesale & retail | 2025 |
| Sterling Auto Group Limited | Wholesale & retail | 2026 |
| Sterling BIM Limited | Professional & scientific | 2015 |
| Sterling Living Limited | Real estate | 2014 |
| Sterling MEP Services Limited | Extraterritorial | 2015 |
| Sterling Motor Group Ltd | Wholesale & retail | 2022 |
| Sterling Properties & Investments (London) Ltd | Real estate | 2021 |
| Sterling's Hair Limited | Extraterritorial | 2024 |
| Sternberg Reed LLP | | 2021 |
| Stevan Services Limited | Administrative & support | 2023 |
| Stewart Castle (Holdings) Limited | Financial services | 2020 |
| Stewart Castle Limited | Financial services | 2016 |
| Stewart Holdings Limited | Construction | 2016 |
| Sthira Ltd | Real estate | 2026 |
| Stick Care Ltd | Administrative & support | 2013 |
| Stick Health Limited | Hospitality | 2016 |
| STJ Property Management Ltd | Real estate | 2023 |
| STM Electrician Ltd | Construction | 2023 |
| STO Transport Ltd | Transport & logistics | 2026 |
| Stock Processors Limited | Transport & logistics | 2024 |
| Stocked UP Ltd | Wholesale & retail | 2024 |
| Stockwin of London Limited | Manufacturing | 1989 |
| Stokenewington Property Ltd | Real estate | 2023 |
| Stone Surface Limited | Construction | 2010 |
| Stonearch Ltd | Real estate | 2025 |
| Stonebridge Corporation Services Ltd | Administrative & support | 2025 |
| Stonecraft Paving Contractors Ltd | Construction | 2013 |
| Stoned Town Ltd | Hospitality | 2020 |
| Stoneme Fine Art Ltd | Wholesale & retail | 2012 |
| Stoneology Limited | Extraterritorial | 2013 |
| Stonepath Ventures Ltd | Hospitality | 2024 |
| Storky Coffee Limited | Hospitality | 2018 |
| Storm Stoppers Glazing Ltd | Manufacturing | 2023 |
| Straclics Limited | Professional & scientific | 2021 |
| Strandies Ltd | Information & communication | 2020 |
| Strathburn Consulting Limited | Wholesale & retail | 2014 |
| Strathmoore Services Limited | Construction | 2018 |
| Stratos Innovations Ltd | Wholesale & retail | 2025 |
| Stratton & Blake Limited | Real estate | 2025 |
| Streamlyncs Ltd | Information & communication | 2024 |
| Streax Direct Ltd | Wholesale & retail | 2024 |
| Street TAG Limited | Information & communication | 2018 |