| Squarebox Properties Limited | Real estate | 2019 |
| Squeaky Clean Windows Ltd | Administrative & support | 2018 |
| Squires Cross Residents Management Company Limited | Households | 2025 |
| Squires Gate Management Company (NO.2) Limited | Households | 1998 |
| SR & Sons Properties Ltd | Real estate | 2024 |
| SR Locum (UK) Ltd | Health & social care | 2012 |
| SR Merchandise Limited | Wholesale & retail | 2009 |
| SR Residential Limited | Real estate | 2025 |
| SR Resourcing Limited | Administrative & support | 2023 |
| SRB Homes Limited | Real estate | 2022 |
| SRC Equestrian Ltd | Arts & recreation | 2014 |
| Sree Consultants Limited | Administrative & support | 2014 |
| SRI Vinayagan Ltd | Real estate | 2014 |
| Srinihomes Limited | Real estate | 2024 |
| Srisai SNS Limited | Real estate | 2020 |
| SRL Accountancy Limited | Professional & scientific | 2016 |
| SRN Holdings Ltd | Real estate | 2018 |
| SRP Properties Limited | Real estate | 2016 |
| SRR Technologies Limited | Information & communication | 2012 |
| SRS Aviation Ltd | Education | 2019 |
| SS Build Ltd | Construction | 2026 |
| SS Builders Limited | Construction | 2014 |
| SS Buildings Contractor WM Ltd | Construction | 2018 |
| SS Classics Ltd | Wholesale & retail | 2025 |
| SS Project Consultancy Ltd | Professional & scientific | 2025 |
| SS Property Services Limited | Real estate | 2015 |
| SSC Business Services Ltd | Administrative & support | 2022 |
| SSD Homes Ltd | Real estate | 2024 |
| Ssdf Limited | Real estate | 2026 |
| SSE Audio Group Holdings Limited | Professional & scientific | 2001 |
| SSE Audio Group Limited | Extraterritorial | 1998 |
| SSE Hire Limited | Extraterritorial | 1998 |
| Ssedevelopment Ltd | Real estate | 2023 |
| SSG Support Ltd | Information & communication | 2023 |
| SSM Agile Consultancy Ltd | Information & communication | 2024 |
| SSM Contracting Holdings Ltd | Construction | 2024 |
| SSM Contracting Ltd | Construction | 2024 |
| SSS IT Solutions Limited | Information & communication | 2016 |
| SSS3 Foods Limited | Hospitality | 2026 |
| ST Andrews Academy CIC | Arts & recreation | 2015 |
| ST Davids Vacation Club Limited | Real estate | 1982 |
| ST Georges Aesthetics Ltd | Health & social care | 2023 |
| ST Georges Gardens (2026) Holdco Ltd | Real estate | 2026 |
| ST Giles Court (Sheldon) Management Company Ltd | Households | 2021 |
| ST James Associates Limited | Professional & scientific | 2022 |
| ST Laurence View (Ludlow) Management Company Limited | Households | 2019 |
| ST Lettings Ltd | Real estate | 2019 |
| ST Margaret's (Olton) Limited | Households | 1982 |
| ST Marks Gate Management Company Limited | Households | 2019 |
| ST Marys Weymouth Manco Limited | Administrative & support | 2024 |
| ST Mina & Pope Kyrillos Ltd | Health & social care | 2024 |
| ST Patrick's Church of England Primary Academy | Education | 2010 |
| ST Paul's Mews (Birmingham) Limited | Real estate | 1996 |
| ST Philips Place Management Company Limited | Households | 2017 |
| ST Robinson Building Services Ltd | Construction | 2017 |
| St&T Holding Limited | Real estate | 2020 |
| ST. Davids Apartments Limited | Real estate | 1975 |
| ST3ORTHOBOSS Ltd | Education | 2023 |
| STA Hospitality Ltd | Hospitality | 2026 |
| Stadco West Midlands Limited | Construction | 2011 |
| Staffordshire Mechanical (Holdings) Limited | Financial services | 2016 |
| Staffordshire Mechanical Properties Limited | Real estate | 2017 |
| Staffordshire Mechanical Solutions Ltd | Professional & scientific | 2011 |
| Staffs Leisure Ltd | Hospitality | 2023 |
| Stag & Co Barbershop Limited | Other services | 2019 |
| Stage One Technology Limited | Professional & scientific | 2011 |
| Stage One World Rally Services Limited | Administrative & support | 2010 |
| Stampede Acquisition Limited | Professional & scientific | 2005 |
| Standard Letting Ltd | Hospitality | 2018 |
| Standard Products Ltd | Manufacturing | 2020 |
| Standlake Motor Company Ltd | Wholesale & retail | 2024 |
| Standleys LLP | | 2011 |
| Stanislaus Logistics Limited | Transport & logistics | 2013 |
| Stanley Enterprises Ltd | Administrative & support | 2024 |
| Stanley's Building and Roofing Limited | Construction | 2018 |
| Stanley's Property Investments Ltd | Real estate | 2026 |
| Stanleygrace Limited | Information & communication | 2023 |
| Stanthorpe Holdings Limited | Professional & scientific | 2004 |
| Stanton Construction Limited | Construction | 1992 |
| Stanton Keller Limited | Administrative & support | 2019 |
| Stanton Property Construction Limited | Construction | 2017 |
| Star Central Limited | Administrative & support | 2015 |
| Star HFS Equipment Ltd | Wholesale & retail | 2016 |
| Star Planning and Development Limited | Professional & scientific | 2002 |
| Star Sterling (Outsourcing) Limited | Administrative & support | 2018 |
| Star Sterling Academy Ltd | Education | 2022 |
| Star Sterling Limited | Administrative & support | 2018 |
| Star Temple Limited | Professional & scientific | 2019 |
| Starling Developments Rubery Ltd | Professional & scientific | 2019 |
| Starling Home Developments Limited | Construction | 2025 |
| Start Estates Limited | Construction | 2002 |
| Start Portfolio Limited | Real estate | 2008 |
| Startup Spaceship Ltd | Information & communication | 2018 |
| Station Fish Bar Limited | Hospitality | 2023 |
| Station Road (Knowle) Management Limited | Households | 1990 |
| Stationside Commercials Limited | Wholesale & retail | 1994 |
| Status Heating Limited | Construction | 1973 |
| Status Heating Services Limited | Construction | 2021 |
| Status Mechanical Services Limited | Construction | 1987 |
| Status Midlands Limited | Financial services | 2011 |