| ST. James's Investments Ltd | Other services | 2023 |
| ST. John’S Parade (D) Ltd | Real estate | 2020 |
| ST. John’S Parade (Ealing) Ltd | Real estate | 2020 |
| ST. John’S Parade (L) Ltd | Real estate | 2020 |
| ST. John’S Parade (M) Ltd | Real estate | 2020 |
| ST. John’S Parade (R) Ltd | Real estate | 2020 |
| ST. John’S Parade (S) Ltd | Real estate | 2020 |
| STA 8 Limited | Real estate | 2024 |
| Stabroad Ltd | Real estate | 2018 |
| Stag Green Investments Ltd | Financial services | 2020 |
| Stag Private Finance Ltd | Financial services | 2021 |
| Stage Door Ventures Limited | Wholesale & retail | 2009 |
| Stairlift Recycling Ltd | Manufacturing | 2013 |
| Stallion Real Estates Ltd | Other services | 2018 |
| Stanley James Ltd | Real estate | 2024 |
| Stanmore 2023 Ltd | Real estate | 2023 |
| Stanmore Accountants Ltd | Professional & scientific | 2021 |
| Stanmore Car Sales Ltd | Wholesale & retail | 2018 |
| Stanmore Dental Surgery Limited | Health & social care | 2018 |
| Stanmore DRY Cleaners Limited | Other services | 2013 |
| Stanmore Entertainment Limited | Hospitality | 2025 |
| Stanmore Estates Ltd | Real estate | 2014 |
| Stanmore Golf & Banqueting Limited | Arts & recreation | 2016 |
| Stanmore Hall Properties Limited | Real estate | 2000 |
| Stanmore Links Limited | Arts & recreation | 1925 |
| Stanmore Musculoskeletal Clinic Limited | Health & social care | 2019 |
| Stanmore Print & Mail Ltd | Administrative & support | 2020 |
| Stanmore Property Estates (Leicester) Limited | Professional & scientific | 2004 |
| Stanmore Property Estates Limited | Real estate | 2004 |
| Stanmore Property Services Ltd | Real estate | 2017 |
| Stanmore Van Hire Ltd | Administrative & support | 2026 |
| Stansted Demolition Ltd | Construction | 2016 |
| Star (2016) Ltd | Real estate | 2016 |
| Star Auto Rentals Ltd | Administrative & support | 2019 |
| Star Books International Ltd | Information & communication | 2020 |
| Star Car Parts Limited | Other services | 2009 |
| Star Factor (UK) Ltd | Real estate | 2015 |
| Star Health Consulting Ltd | Health & social care | 2014 |
| Star Support Lgbtiq+ C.I.C. | Hospitality | 2022 |
| Starbuzz London Limited | Wholesale & retail | 2013 |
| Starry the UK Limited | Real estate | 2013 |
| Startec Investments Limited | Real estate | 2011 |
| Station Yard Meldreth Ltd | Construction | 2016 |
| Stavv Ltd | Professional & scientific | 2025 |
| Stay & Play Nursery (Stanmore) Ltd | Education | 2026 |
| Stay Woke Ltd | Information & communication | 2021 |
| Stayli Ltd | Real estate | 2025 |
| Steam Driven Films Limited | Information & communication | 2005 |
| Steden Infrastructure Finance Services Ltd | Financial services | 2015 |
| Steel Card Technologies Limited | Other services | 2021 |
| Steel Metal Crafts Limited | Wholesale & retail | 2023 |
| Steel Options Limited | Manufacturing | 1997 |
| Steel Origin Ltd | Wholesale & retail | 2025 |
| Stein Financial Limited | Financial services | 2006 |
| Stell SEC Limited | Administrative & support | 2013 |
| Stellchlo Limited | Real estate | 2025 |
| Stem Edutainment Limited | Education | 2019 |
| Stencell Ltd | Real estate | 2001 |
| Steptoe & SON Limited | Professional & scientific | 2003 |
| Sterling Design and Construction Limited | Extraterritorial | 2016 |
| Sterling Estates Management Group Limited | Real estate | 2010 |
| Sterling Estates Management Limited | Real estate | 2005 |
| Sterling Heritage Holdings Limited | Real estate | 2026 |
| Steve Watts Consultancy Ltd | Professional & scientific | 2023 |
| Stewart Meldrum Limited | Information & communication | 2007 |
| Stone Butters Residential Limited | Real estate | 2012 |
| STONE2SERVE Limited | Manufacturing | 2025 |
| Stoneage Digital Limited | Information & communication | 2012 |
| Stonebourne Properties Limited | Construction | 1958 |
| Stonecedar Property Management Limited | Households | 2006 |
| Stonehall Estates Ltd | Extraterritorial | 2011 |
| Stonerock Construction Ltd | Construction | 2024 |
| Stonerock Group Ltd | Financial services | 2018 |
| Stonesbridge Ltd | Professional & scientific | 2019 |
| Stoneweb Services Ltd | Extraterritorial | 2011 |
| Stonewoods Limited | Manufacturing | 1992 |
| Stoney YS Limited | Real estate | 2022 |
| Stony Limited | Hospitality | 2020 |
| Stony Mere Ltd | Professional & scientific | 2012 |
| Stony's Take Away Limited | Hospitality | 2024 |
| Storm Technical Limited | Construction | 2002 |
| Stourbridge Property Limited | Real estate | 2021 |
| Strafe Servers Limited | Information & communication | 2021 |
| Straightsmiles Ltd | Health & social care | 2026 |
| Strand Leisure Ltd | Administrative & support | 2007 |
| Strang Consultancy Limited | Information & communication | 2014 |
| Strategic Decisions Ltd | Professional & scientific | 2025 |
| Strategy & Capital Advisory Ltd | Professional & scientific | 2024 |
| Stratford EYE RTM Company Limited | Extraterritorial | 2012 |
| Strativa Holdings Ltd | Financial services | 2025 |
| Stratos Compliance Limited | Professional & scientific | 2024 |
| Strawberry Media Limited | Information & communication | 2010 |
| Streamdale Limited | Administrative & support | 2000 |
| Streamline (Environmental Services) Ltd. | Construction | 1997 |
| Streamline Accident Repair Centre Limited | Manufacturing | 2001 |
| Stretchi Limited | Other services | 2023 |
| Strictly Trade Limited | Wholesale & retail | 2013 |
| Strondo Ltd | Professional & scientific | 2022 |
| Strong Rope Access Ltd | Construction | 2024 |
| Strongbold Limited | Real estate | 1989 |