| Stan Construction 33 Ltd | Construction | 2024 |
| Star Build Associates Ltd | Professional & scientific | 2017 |
| Star Fire Engineering Ltd | Construction | 2006 |
| Star Fire Protection Ltd | Construction | 2026 |
| Star Security UK Ltd | Other services | 2024 |
| Starbloom Marketing Ltd | Wholesale & retail | 2026 |
| Staren Limited | Health & social care | 2024 |
| Starkidz Childcare Ltd | Health & social care | 2026 |
| Starlight Property Maintenance Ltd | Construction | 2022 |
| Starling Private Limited | Wholesale & retail | 2025 |
| Starr Inc Ltd | Real estate | 2020 |
| Start Inspiring Ltd | Professional & scientific | 2020 |
| Start Monday Limited | Administrative & support | 2008 |
| Start PM Ltd | Real estate | 2025 |
| Start Recruitment Group Limited | Administrative & support | 2009 |
| Startus Heating & Maintenance Ltd | Construction | 2025 |
| Starvinyls Ltd | Other services | 2010 |
| Station Vape & Mobile-Convenience Store Ltd | Wholesale & retail | 2023 |
| Status Solutions UK Limited | Professional & scientific | 2004 |
| Steel Recruitment Technology Services Ltd | Information & communication | 2023 |
| Steelhouse Lane Development Ltd | Construction | 2025 |
| Steeltek-Design Ltd | Professional & scientific | 2025 |
| Steindeal Services Limited | Real estate | 2002 |
| Stella Housing Limited | Real estate | 2023 |
| Stella Stay Ltd | Hospitality | 2026 |
| Stemic Enterprises Ltd | Professional & scientific | 2025 |
| Step and Learn | Health & social care | 2011 |
| Step Resourcing Limited | Administrative & support | 2022 |
| Stephens and Sons Business Consulting Limited | Professional & scientific | 2025 |
| Steponavicius Group Ltd | Transport & logistics | 2025 |
| Stepping Stones Leisure Limited | Hospitality | 2021 |
| Stepre Global Limited | Hospitality | 2020 |
| Sterling Projects Kent Ltd | Construction | 2025 |
| Steve & Aaron Waste Logistics Ltd | Water & waste | 2025 |
| Stevens Scaffolding Ltd | Construction | 2015 |
| Steward Property Group Ltd | Real estate | 2022 |
| Stewart Dinky Ellens Limited | Information & communication | 2018 |
| Stick-Mig-Welding & DRY Docks Limited | Manufacturing | 2020 |
| Stick-Mig-Welding Fabrication Ltd | Manufacturing | 2012 |
| Stivan Georgiev Ltd | Transport & logistics | 2017 |
| Stokley Services Limited | Real estate | 2022 |
| Stone Masons Ltd | Construction | 2023 |
| Stonehizz UK Limited | Transport & logistics | 2019 |
| Stoneshot Development Limited | Real estate | 2018 |
| Stories of Provenance Ltd | Professional & scientific | 2025 |
| Stormchasers Events Limited | Administrative & support | 2018 |
| Stormchasers Limited | Administrative & support | 2007 |
| Storminno Ltd | Professional & scientific | 2023 |
| Stoveco Ltd | Administrative & support | 2016 |
| Strada Construction Limited | Construction | 2004 |
| Straight Line Projects Ltd | Construction | 2019 |
| Strategic Homes and Properties Ltd | Real estate | 2021 |
| Strategic Properties Investment Ltd | Real estate | 2025 |
| Strategy and Projects Consultants Ltd | Construction | 2019 |
| Stratford Rail (SE) Ltd | Construction | 2023 |
| Stream Rise Plus Limited | Transport & logistics | 2013 |
| Stream Water Treatment Ltd | Water & waste | 2023 |
| Streamline Standard Ltd | Wholesale & retail | 2019 |
| Streamtax Ltd | Transport & logistics | 2021 |
| Streamtech Audio Ltd | Information & communication | 2019 |
| Street END Road Limited | Households | 2004 |
| Streets Estates Ltd | Real estate | 2007 |
| Stressless Properties Ltd | Real estate | 2017 |
| Stretch Ltd | Professional & scientific | 2024 |
| Strood Park Services Ltd | Wholesale & retail | 2018 |
| Structural Steel Consultancy Limited | Manufacturing | 2016 |
| Sttack Ltd | Construction | 2025 |
| Studio 7 Ltd | Other services | 2015 |
| Studio Anjin Ltd. | Information & communication | 2020 |
| Studio Hi-Viz Ltd | Wholesale & retail | 2020 |
| Studio Hunter Ltd | Real estate | 2015 |
| Studio Twenty-Six Ltd | Professional & scientific | 2023 |
| STUDIO33 Entertainment Ltd | Arts & recreation | 2026 |
| Studwall Ltd | Construction | 2020 |
| Suaad Ltd | Professional & scientific | 2022 |
| Suaq Ecart Limited | Wholesale & retail | 2024 |
| Subterra Drilling Ltd | Mining & quarrying | 2026 |
| Successful Drylining UK Ltd | Construction | 2017 |
| SUE Jefferies Limited | Real estate | 2025 |
| Sugartfactory Ltd | Manufacturing | 2016 |
| Suibhne Ltd | Information & communication | 2026 |
| Suite Clean Ltd | Administrative & support | 2025 |
| Suklaa Limited | Other services | 2007 |
| Sully's Academy Ltd | Professional & scientific | 2024 |
| Sully's Wealth Group Ltd | Financial services | 2025 |
| Sultan Indian Restaurants Ltd | Hospitality | 2017 |
| Summers Cleaning Ltd | Administrative & support | 2026 |
| Summit Cooling Service & Maintenance Limited | Construction | 2013 |
| Summit Developments Group Ltd | Construction | 2026 |
| Summit Hydrocarbons Ltd | Wholesale & retail | 2025 |
| Summit N' Nowt Limited | Real estate | 2026 |
| Summit Roof Maintenance Limited | Construction | 2025 |
| Sun Pier House CIC | Hospitality | 2013 |
| Sungloball Ltd | Manufacturing | 2025 |
| Sunnysocks Digital Marketing Ltd | Professional & scientific | 2022 |
| Sunset and Skyline Travels Ltd | Administrative & support | 2025 |
| Super Cleaning Ltd | Administrative & support | 2023 |
| Super Pizza Kent Ltd | Hospitality | 2025 |
| Super Rainbow Tech Ltd | Manufacturing | 2024 |
| Super Sonic Logistics Ltd | Transport & logistics | 2016 |