| ST Glasgow Ltd | Hospitality | 2025 |
| ST Hendericks Recycling Ltd | Water & waste | 2019 |
| ST James' Court Management Company (Norton) Limited | Households | 2014 |
| ST John's Manchester Limited | Construction | 2019 |
| ST John's Mews Limited | Households | 1996 |
| ST Joseph Holdings Ltd | Construction | 2019 |
| ST Joseph's Primary School, a Catholic Voluntary Academy | Education | 2013 |
| ST Joseph's Property Management Limited | Real estate | 2006 |
| ST Luke's Care Ltd | Health & social care | 2009 |
| ST Mark Freight Services Limited | Transport & logistics | 2001 |
| ST Mary's (Bramall Lane) Limited | Hospitality | 2025 |
| ST Mary's House Investors Ltd | Real estate | 2020 |
| ST Marys Business Ltd | Administrative & support | 2016 |
| ST Marys Loft's Managment Company Limited | Households | 2015 |
| ST Matthew's House Limited | Health & social care | 2011 |
| ST Michael DRY Cleaners Ltd | Administrative & support | 2017 |
| ST Paul's Brookfields Park Limited | Construction | 2005 |
| ST Pierre Property Ltd | Real estate | 2016 |
| ST Thomas More Catholic Primary, a Voluntary Academy | Education | 2015 |
| ST. Christophers Motor Company Limited | Wholesale & retail | 1994 |
| ST. Luke's Hospice | Health & social care | 1967 |
| ST. Luke's Options Limited | Wholesale & retail | 1992 |
| ST. Mary's (Bramall Lane) Community Centre | Education | 2001 |
| ST. Paul's Developments Limited | Construction | 1985 |
| ST3 Architectural Tiles Limited | Wholesale & retail | 2016 |
| Stable Getaway Ltd | Hospitality | 2025 |
| Stable Lives Care Ltd | Health & social care | 2015 |
| Stacia Architectural Design Limited | Professional & scientific | 2003 |
| Stack Data Solutions Ltd | Information & communication | 1984 |
| Stack Technology Holdings Ltd | Professional & scientific | 2010 |
| Stack Telecommunications Solutions Ltd | Information & communication | 2010 |
| Stackbay Ltd | Wholesale & retail | 2026 |
| Stackcore Hosting Ltd | Information & communication | 2026 |
| Stacktuition Ltd | Education | 2026 |
| Staff Required 24/7 Limited | Administrative & support | 2013 |
| Staff Well Being Ltd | Education | 2023 |
| Stafford Lane Limited | Households | 1985 |
| Stafford Tech Limited | Information & communication | 2014 |
| Staffordshire Housing Services HOMES2LET & HOMES4SALE Ltd | Real estate | 2018 |
| Staffsuite Limited | Administrative & support | 2025 |
| Stag Leotards Limited | Wholesale & retail | 2023 |
| Stagetrend Limited | Construction | 2002 |
| Stagger Ltd | Hospitality | 2020 |
| Staindrop Construction Limited | Manufacturing | 2009 |
| Stainless Bar Services Limited | Extraterritorial | 2015 |
| Stainless Finishing Services Limited | Manufacturing | 2000 |
| Stainless IT Solutions Ltd | Information & communication | 2023 |
| Stainless Plating Holdings Limited | Financial services | 2023 |
| Stainless UK Limited | Manufacturing | 1986 |
| Stainless UK Technical Limited | Professional & scientific | 2024 |
| Stairsteady Limited | Professional & scientific | 2006 |
| Stairsteady Products Limited | Professional & scientific | 2013 |
| Staite Group Limited | Construction | 2008 |
| Staite Homes Limited | Construction | 2000 |
| Stalker Leisure Limited | Real estate | 2018 |
| Stamdan Ltd | Real estate | 2021 |
| Stamdan Properties Ltd | Real estate | 2021 |
| Stamike Health Care Service Ltd | Health & social care | 2021 |
| Stamp & Smile Limited | Wholesale & retail | 2025 |
| Stamped INK Limited | Arts & recreation | 2025 |
| Stamper Discs Limited | Manufacturing | 2018 |
| Stamy Ltd | Transport & logistics | 2025 |
| Stanage Properties Ltd | Real estate | 2021 |
| Stanage Vision Ltd | Wholesale & retail | 2026 |
| Stancill Brewery Limited | Manufacturing | 2013 |
| Stand to Games Limited | Manufacturing | 2016 |
| Standard Group of Companies Ltd. | Manufacturing | 2014 |
| Standard Pulverised Fuel Company Limited(The) | Professional & scientific | 1935 |
| Standby Energy Services Limited | Manufacturing | 2015 |
| Standby Energy Storage Limited | Transport & logistics | 2025 |
| Standon Engineering Services Limited | Manufacturing | 2000 |
| Standon Property Services Limited | Extraterritorial | 2003 |
| Stanedge Lodge Limited | Real estate | 2023 |
| Stanet Properties Ltd | Real estate | 2019 |
| Stanfield ASH Ltd | Wholesale & retail | 2019 |
| Stanhope Station Limited | Hospitality | 2019 |
| Staniforth Holdings Ltd | Wholesale & retail | 2016 |
| Staniforth Investments Ltd | Real estate | 2020 |
| Staniland Estate Protection Ltd | Professional & scientific | 2026 |
| Stanington Foods Ltd | Hospitality | 2026 |
| Stankievich SPV Ltd | Real estate | 2025 |
| Stanley Clan Publications Ltd | Wholesale & retail | 2024 |
| Stanley Milton Lettings Limited | Real estate | 2021 |
| Stanley Property Lettings Ltd | Real estate | 2019 |
| Stanley Terrace (Morpeth) Limited | Real estate | 2016 |
| Stanley Wines Hutcliffe Wood Road Ltd | Wholesale & retail | 2025 |
| Stanmore Systems Ltd | Extraterritorial | 1987 |
| Stannington Brewery Ltd | Manufacturing | 2018 |
| Stannington Developments Limited | Construction | 2003 |
| Stannington Office Services & Computer Training Ltd | Administrative & support | 2014 |
| Stannington Plumbing Installation Limited | Manufacturing | 2003 |
| Stannington Repair Shop Limited | Wholesale & retail | 2024 |
| Stannington View Management Limited | Households | 1979 |
| Stanwell Close S9 Ltd | Real estate | 2025 |
| Stanza Inc Limited | Manufacturing | 2021 |
| Star 20 Limited | Education | 2019 |
| Star Anise PVT Ltd | Hospitality | 2024 |
| Star Bidco Limited | Administrative & support | 2015 |
| Star Black Ltd | Professional & scientific | 2018 |
| Star Build Recruit Ltd | Administrative & support | 2025 |