| Starlight Travel Limited | Administrative & support | 2022 |
| Starllupy Ltd | Professional & scientific | 2023 |
| Stay Safe Servicing Ltd | Professional & scientific | 2025 |
| Steel Rigg Advisory Limited | Professional & scientific | 2015 |
| Steel Traders (Midlands) Limited | Wholesale & retail | 2020 |
| Steel Traders Limited | Wholesale & retail | 2016 |
| Stefan COE Ltd | Manufacturing | 2014 |
| Step Ahead Support Ltd | Administrative & support | 2020 |
| Step-Change Management Ltd | Professional & scientific | 2023 |
| Stephen FRY Limited | Financial services | 2025 |
| Steps & Coffee Ltd | Wholesale & retail | 2025 |
| Sterling Investment and Management Services Limited | Professional & scientific | 2025 |
| Sterling Property and Investment Consultants (UK) Limited | Real estate | 2014 |
| Sterling Talent Solutions Ltd | Other services | 2025 |
| Sterling Tecknik Transport Ltd | Transport & logistics | 2021 |
| STI Enterprises Holdings Limited | Financial services | 2023 |
| Sticky Brands Limited | Professional & scientific | 2013 |
| STL Healthcare Limited | Health & social care | 2023 |
| Stokes's Cornerstone Building Contractors Ltd | Construction | 2026 |
| Stone International (UK) Ltd | Mining & quarrying | 2014 |
| Stones & Pebbles Limited | Professional & scientific | 2024 |
| Storm Digital Media Group Ltd | Information & communication | 2022 |
| Story Logic Ltd | Arts & recreation | 2025 |
| STR Solutions Limited | Real estate | 2010 |
| Stradlight Limited | Extraterritorial | 1985 |
| Strange Locations Ltd | Information & communication | 2018 |
| Strategic Telecoms Management Services Ltd | Professional & scientific | 2023 |
| Stratford Close Management Limited | Households | 2006 |
| Strawberry Villas (Amberley) Residents Management Company Limited | Households | 2022 |
| Stretch International Limited | Administrative & support | 2018 |
| Stridehq Ltd | Information & communication | 2026 |
| String Traders Ltd | Wholesale & retail | 2024 |
| Strong Vibes Limited | Arts & recreation | 2007 |
| Structural Repair Solutions Ltd | Construction | 2019 |
| Structural Scanning Limited | Administrative & support | 1996 |
| STS Projects Consultancy Limited | Professional & scientific | 2008 |
| Studio ACT Ltd | Professional & scientific | 2021 |
| Studio AG Ltd | Administrative & support | 2017 |
| Studio J Ltd | Professional & scientific | 2024 |
| Stuka Productions Ltd | Professional & scientific | 2016 |
| Stunt Rigging Services Limited | Extraterritorial | 2009 |
| Style Glazing Ltd | Construction | 2026 |
| Styxtech Systems Ltd | Information & communication | 2021 |
| SUE & Steve’S Property Investments Ltd | Real estate | 2012 |
| Suekko Ltd | Real estate | 2025 |
| Sultani Maintenance Ltd | Wholesale & retail | 2026 |
| Summerpark Homes Limited | Real estate | 2003 |
| Sun Park (Farnborough) Management Company Limited | Households | 2015 |
| Sun Printers Block a Limited | Households | 2003 |
| Sun Printers Block B Limited | Households | 2003 |
| Sun Printers Block C Limited | Households | 2004 |
| Sun Printers Estate Management Limited | Households | 2003 |
| Sunning Properties Limited | Households | 1957 |
| Sunnyside Slough Limited | Real estate | 2022 |
| Sunrise Respite Services Ltd | Health & social care | 2026 |
| Sunshine Assets Limited | Real estate | 2017 |
| Sunstone Productions Limited | Information & communication | 2019 |
| Sunutilitiesgroup Limited | Professional & scientific | 2019 |
| Supapowers Growth Assembly Limited | Information & communication | 2025 |
| Super Accessories (UK) Online Ltd | Wholesale & retail | 2019 |
| Supporting Technology Limited | Information & communication | 2021 |
| Suraj Driving School Ltd | Education | 2021 |
| Surestream Digital Limited | Information & communication | 2014 |
| Surface Technology International Limited | Manufacturing | 1988 |
| Surity Limited | Information & communication | 2025 |
| Surrey Driving Force Limited | Education | 2019 |
| Surrey Obesity Service Limited | Health & social care | 2011 |
| Surrey Sami Construction Ltd | Construction | 2025 |
| Surtori Ltd | Information & communication | 2026 |
| Susa Communications Limited | Professional & scientific | 2015 |
| Sushi Point RBW Ltd | Wholesale & retail | 2024 |
| Sussex Glazing Solutions Ltd | Construction | 2020 |
| Sustainable Luxury UK Limited | Administrative & support | 2012 |
| Sutherland Grange Estates Limited | Households | 1995 |
| SW Design and Build London Limited | Construction | 2016 |
| SW Developer UK Ltd | Construction | 2025 |
| SW London Development Ltd | Real estate | 2026 |
| SW Properties and Development Ltd | Real estate | 2026 |
| SW UK Properties Ltd | Real estate | 2026 |
| Swallow Surface Coatings Limited | Construction | 2018 |
| Swallowfield Park Management Limited | Households | 2004 |
| Swan Clewer Community Interest Company | Hospitality | 2016 |
| Swan Village Care Services Limited | Health & social care | 1995 |
| Swanage Properties Ltd | Construction | 2015 |
| Swedish by Design Limited | Extraterritorial | 2022 |
| Swedish Lifestyle Homes NO.2 Limited | Construction | 2016 |
| Sweep Home Limited | Administrative & support | 2024 |
| Swjl Properties Ltd | Real estate | 2018 |
| Sycamore CT RTM Company Limited | Households | 2018 |
| Sycamore&Co Ltd | Real estate | 2025 |
| Syclone Signs and Graphics Ltd | Professional & scientific | 2019 |
| Sykey Ltd | Wholesale & retail | 2025 |
| SYM Infinity Limited | Hospitality | 2022 |
| Syncmy Ltd | Information & communication | 2008 |
| Syncpro Consulting Limited | Other services | 2024 |
| Synexra Limited | Information & communication | 2025 |
| Synor House Limited | Real estate | 2020 |
| Synytska UN Limited | Administrative & support | 2025 |
| SZN F&B Ltd | Hospitality | 2025 |
| Szol Tyres Ltd | Wholesale & retail | 2020 |