| Spud Brothers Limited | Hospitality | 2015 |
| Spurgate Ventures Ltd | Professional & scientific | 2021 |
| Sqcp Ltd. | Administrative & support | 2000 |
| Squadwise Ltd | Information & communication | 2018 |
| Squeroots Enterprise Ltd | Construction | 2026 |
| SR & HR Property Investments Limited | Real estate | 2020 |
| SR Brown Holdings Ltd | Real estate | 2017 |
| SR Utilities Ltd | Construction | 2020 |
| SR777 Ltd | Professional & scientific | 2023 |
| SRD Services Ltd | Professional & scientific | 2019 |
| Sree Scoops Ltd | Hospitality | 2024 |
| Sreya Solutions Ltd | Information & communication | 2013 |
| SRG Enterprises Limited | Real estate | 2014 |
| SRI AA Properties Limited | Real estate | 2024 |
| SRI Business Ltd | Real estate | 2023 |
| SRI Lakshmi Narashima Swamy Technologies Ltd | Information & communication | 2023 |
| SRI RK Properties Ltd | Real estate | 2023 |
| SRJ Consultancy Solutions Ltd | Professional & scientific | 2025 |
| SRK Builders Limited | Construction | 2012 |
| SRS IT Services Limited | Information & communication | 2018 |
| Sruk Housing Solutions Limited | Hospitality | 2016 |
| SS Top Trade Ltd | Construction | 2023 |
| Ssah Estates Ltd | Real estate | 2020 |
| SSJ Tandoori Ltd | Hospitality | 2017 |
| SSK Technologies Ltd | Information & communication | 2021 |
| Ssmant Holdings Ltd | Financial services | 2026 |
| Ssovereign Software Services Limited | Information & communication | 2011 |
| ST Andrews Street Limited | Other services | 2019 |
| ST Cloud Way Block B Management Limited | Households | 2022 |
| ST Helen's Catholic Junior School Academy | Education | 2011 |
| ST James Properties & Investments Ltd | Real estate | 2023 |
| ST James's Court Residents Company Limited | Households | 1998 |
| ST Leger Investments Ltd | Households | 2021 |
| ST Marys Lane Developments Limited | Construction | 2020 |
| ST Properties Oxford Ltd | Real estate | 2017 |
| ST. Lewis Design Limited | Construction | 2010 |
| ST. Mary Nurseries Limited | Health & social care | 2022 |
| ST. Michael's Homes Limited | Health & social care | 1991 |
| ST. Michaels Care Services Limited | Real estate | 1992 |
| STA Homes Ltd | Real estate | 2022 |
| STA Pharma Ltd | Wholesale & retail | 2021 |
| STA Plant Ltd | Administrative & support | 2002 |
| Stable Future Ltd. | Manufacturing | 2024 |
| Staff One Limited | Administrative & support | 2016 |
| Stafford Mansions Limited | Households | 2006 |
| Stamford Lane Properties Ltd | Real estate | 2016 |
| Stanford Management Services Limited | Construction | 1972 |
| Stanley Loves Koko Limited | Other services | 2015 |
| Stannary Street Limited | Households | 2003 |
| Stanton & Co Accountants Ltd | Professional & scientific | 2002 |
| Star Medical Consultancy Limited | Health & social care | 2012 |
| Star Products Limited | Wholesale & retail | 2022 |
| STAR5 Property Services Limited | Hospitality | 2015 |
| Starguard Holdings Ltd | Real estate | 2019 |
| Static Security Limited | Professional & scientific | 2002 |
| Station Road Kebab Ltd | Hospitality | 2022 |
| Statistical and Machine Learning Solutions Ltd | Professional & scientific | 2022 |
| STB Consultancy Ltd | Professional & scientific | 2012 |
| Steadman Mechanical & Electrical Services Limited | Manufacturing | 2014 |
| Stealth Advertising Limited | Professional & scientific | 2019 |
| Steamers.Com Limited | Professional & scientific | 2004 |
| Stebbing Developments Limited | Construction | 2021 |
| Steelcut Limited | Information & communication | 2022 |
| Steele Roofing & Buildings Ltd | Construction | 2003 |
| Stefanini International Holdings Ltd | Information & communication | 2009 |
| Stefanini UK Ltd | Information & communication | 2001 |
| Stellar Club Ltd | Professional & scientific | 2025 |
| Stellar Financial Services Limited | Professional & scientific | 2011 |
| Stellar Robotics Ltd | Manufacturing | 2021 |
| Step Forward Property Ltd | Real estate | 2016 |
| Step Into Yoga Ltd | Other services | 2019 |
| Stephen Alderdice Ventures Ltd | Professional & scientific | 2017 |
| Stephen Price & Co Hans Place Limited | Arts & recreation | 2016 |
| Stephens Hope Ltd | Real estate | 2022 |
| Sterling England Limited | Real estate | 2013 |
| Sterling MBC Limited | Construction | 2010 |
| Sterlings Accountancy Solutions Limited | Professional & scientific | 2005 |
| Stern Partners Limited | Financial services | 2013 |
| Steve Smith Upholstery Ltd | Manufacturing | 2014 |
| Stevenson & Co Accountants Limited | Professional & scientific | 2006 |
| Stewart D. Schwartz Organisation Limited | Manufacturing | 1995 |
| Still I Rise Ltd | Health & social care | 2019 |
| Stirling Trustees Limited | Administrative & support | 2019 |
| STM Trans Limited | Transport & logistics | 2018 |
| Stock Design Ltd | Professional & scientific | 2019 |
| Stoic Resources Limited | Professional & scientific | 2020 |
| Stondon Capital Limited | Financial services | 2018 |
| Stone ARK LB & Co Ltd | Construction | 2020 |
| Stones Builders Limited | Construction | 2009 |
| Stones Distribution Ltd | Transport & logistics | 2011 |
| Stoney Lane Limited | Hospitality | 2015 |
| Store POD Rental Recoveries Limited | Real estate | 2025 |
| Stortford Toys Limited | Wholesale & retail | 2012 |
| Stowfix Ltd | Wholesale & retail | 2024 |
| Strada Crest Limited | Administrative & support | 2008 |
| Strategic Property & FM Consulting Ltd | Professional & scientific | 2018 |
| Strategize Ltd | Professional & scientific | 2019 |
| Stratford Management Consulting Ltd | Information & communication | 2025 |
| Stratizzan Ltd. | Professional & scientific | 2026 |
| Strawberry Bars (Basildon) Ltd | Administrative & support | 2016 |