| Stephen Vincent Dental Ceramics LAB Ltd | Manufacturing | 2023 |
| Stephensons Risk Management Limited | Financial services | 2015 |
| Sterisafe UK Limited | Manufacturing | 2024 |
| Sterling Autos Limited | Wholesale & retail | 2025 |
| Steve Wilson Travel Consulting Limited | Administrative & support | 2013 |
| Steyn Group Services Limited | Other services | 2021 |
| Steyn Lodge Ltd | Hospitality | 2024 |
| Stillman Garden Services Limited | Administrative & support | 2013 |
| Stirling Cassidy Limited | Professional & scientific | 2024 |
| Stnl Ltd | Information & communication | 2024 |
| Stoch Limited | Transport & logistics | 2017 |
| Stock Tech Ltd | Wholesale & retail | 2021 |
| Stockgpt Ltd | Information & communication | 2026 |
| Stocktake for ME Limited | Professional & scientific | 2021 |
| Stokenchurch Heritage Conservation Group CIC | Hospitality | 2025 |
| Stokenchurch Service Centre Limited | Wholesale & retail | 1990 |
| Stolen Ride Ltd | Information & communication | 2016 |
| Stone Digital Marketing Limited | Information & communication | 2016 |
| Stone Grey Consultancy Limited | Professional & scientific | 2018 |
| Stone PIT Restoration Limited | Construction | 1992 |
| Stone Print Limited | Administrative & support | 2022 |
| Stonebridge Construct Ltd | Construction | 2025 |
| Stonebridge UK Property Limited | Households | 2026 |
| Stonegate Commerce Ltd | Manufacturing | 2026 |
| Stoneleigh Data Analytics Limited | Administrative & support | 2025 |
| Stonepit Limited | Professional & scientific | 2007 |
| Stonewise Paving and Building Ltd | Administrative & support | 2022 |
| Storage Forge Ltd | Information & communication | 2026 |
| Storagecare Limited | Information & communication | 2009 |
| Storm Carpentry Ltd | Construction | 2026 |
| Storrie & Company Limited | Professional & scientific | 2016 |
| Storrie Books Ltd | Wholesale & retail | 2023 |
| Stow Blockchain Solutions Limited | Information & communication | 2021 |
| Stows Cycles Limited | Wholesale & retail | 2002 |
| STP Risk Solutions Limited | Financial services | 2015 |
| STR Holdings Limited | Financial services | 2025 |
| STR Plastering Ltd | Construction | 2026 |
| STR Property Ventures Ltd | Real estate | 2023 |
| Straight Talking IT Limited | Information & communication | 2014 |
| Strange Days Ltd | Arts & recreation | 2021 |
| Strange Sports Limited | Arts & recreation | 2008 |
| Strategic Technology GB Ltd | Information & communication | 2024 |
| Strategy GEN Ltd | Information & communication | 2023 |
| Strategyskills.Org Ltd | Education | 2025 |
| Stratus Vector Ltd | Professional & scientific | 2026 |
| Strawberry Grove Fine Foods Limited | Wholesale & retail | 2014 |
| Strawberry Grove Group Ltd | Wholesale & retail | 2019 |
| Strawm Ltd | Professional & scientific | 2026 |
| Streamdown Limited | Manufacturing | 1991 |
| Streamdown Properties Ltd | Real estate | 2019 |
| Streamline Repairs Limited | Other services | 2024 |
| Streats Global Ltd | Hospitality | 2018 |
| Streetx Cars UK Ltd | Wholesale & retail | 2026 |
| Streme Franchising Ltd | Administrative & support | 2017 |
| Streme Limited | Wholesale & retail | 2007 |
| Strength & Motion Empowerment Ltd | Education | 2024 |
| Strictly Cleaning Limited | Administrative & support | 2019 |
| Stride Communications Limited | Information & communication | 2010 |
| Stringybark Creative Limited | Construction | 2022 |
| Stringybark Ltd | Construction | 2012 |
| Stripes and Whistles Limited | Information & communication | 2011 |
| Strively Ltd | Information & communication | 2025 |
| Strivex Ltd | Professional & scientific | 2017 |
| Strivio Ltd | Information & communication | 2025 |
| Stroid Ltd | Professional & scientific | 2025 |
| Structuco Ltd | Construction | 2018 |
| Strummers Music School Limited | Education | 2019 |
| Stuart International Limited | Manufacturing | 1992 |
| Stuart Kerr SFX Limited | Arts & recreation | 2015 |
| Stuart Robinson Plumbing and Heating Limited | Construction | 2012 |
| Stuart Wakelin Communications Limited | Administrative & support | 2016 |
| Stuart’S HGV Medic Ltd | Wholesale & retail | 2025 |
| Stubs Limited | Other services | 2009 |
| Stud.Ent Limited | Professional & scientific | 2006 |
| Studdridge Kinros Limited | Construction | 2021 |
| Studio 18 Interiors Ltd | Professional & scientific | 2025 |
| Studio 433 Limited | Arts & recreation | 2008 |
| Studio ARI Ltd | Education | 2025 |
| Studio Barbara Luiza Ltd | Other services | 2024 |
| Studio Holdings Limited | Real estate | 2011 |
| Studio Leonie Ltd | Wholesale & retail | 2025 |
| Studio Luigi Ltd | Information & communication | 2026 |
| Studio Montage Limited | Information & communication | 2007 |
| Studio Morii Ltd | Professional & scientific | 2023 |
| Studio Sound Design Limited | Information & communication | 2014 |
| Studio Sweat Ltd | Arts & recreation | 2024 |
| Studylinksuk Limited | Education | 2025 |
| Style X Properties Ltd | Real estate | 2012 |
| Stylish Euro Glazing Limited | Manufacturing | 2016 |
| Styloop Ltd | Wholesale & retail | 2026 |
| SU CHE Design Limited | Wholesale & retail | 2021 |
| SU Quei Monti Limited | Information & communication | 2011 |
| SUA Fruta Ltd | Wholesale & retail | 2026 |
| Subba Limited | Health & social care | 2021 |
| Subco Merchant Holdings Limited | Financial services | 2019 |
| Subhan Trading Ltd | Wholesale & retail | 2026 |
| Sublime Foods Ltd | Hospitality | 2018 |
| Sublime Property Holdings Ltd | Real estate | 2026 |
| Success Design & Build Limited | Construction | 2015 |
| Sudden Limited | Information & communication | 2026 |