| SSV Built Ltd | Construction | 2024 |
| SSV Property UK Ltd | Real estate | 2025 |
| SSV Solutions Ltd | Information & communication | 2015 |
| Ssyrconsultants Ltd | Wholesale & retail | 2018 |
| ST Albans D&P Ltd | Wholesale & retail | 2025 |
| ST Albans Road Investments Limited | Real estate | 2016 |
| ST Andrews House Property Management Limited | Households | 1994 |
| ST Andrews Tower Ltd | Real estate | 2018 |
| ST Elizabeth Limited | Professional & scientific | 2018 |
| ST Family Limited | Real estate | 2020 |
| ST George's (Liverpool) Limited | Health & social care | 2003 |
| ST George's (Wigan) Limited | Health & social care | 2003 |
| ST George's Fine Art Limited | Other services | 2016 |
| ST Hillare Electrical Services Ltd | Construction | 2003 |
| ST James Investment Property Ltd | Real estate | 2023 |
| ST James Property Trading Ltd | Real estate | 2024 |
| ST Jerome Church of England Bilingual Primary School | Education | 2014 |
| ST Johns Property Consultancy Limited | Real estate | 2018 |
| ST Joseph's Gate Management Limited | Households | 2014 |
| ST Luke's Church Freehold Company Limited | Households | 2004 |
| ST Mary and ST Mina Ltd | Real estate | 2023 |
| ST Music Academy Ltd | Manufacturing | 2024 |
| ST Olaf Golf Hotel Limited | Hospitality | 2023 |
| ST Paul’S Ventures Limited | Real estate | 2023 |
| ST Propco Limited | Real estate | 2023 |
| ST Rule Street RTM Company Limited | Households | 2011 |
| ST Salon Limited | Other services | 2016 |
| ST Serene Limited | Other services | 2018 |
| ST Smart Construction Ltd | Construction | 2025 |
| ST Tourist Ltd | Administrative & support | 2025 |
| ST Trade Limited | Manufacturing | 2022 |
| ST Zagros Properties Limited | Construction | 2024 |
| ST. Avenue Limited | Manufacturing | 2021 |
| ST. Bertha Day Care Nursery Ltd | Health & social care | 2020 |
| ST. Caspian Care Limited | Real estate | 2020 |
| ST. Caspian Properties Limited | Real estate | 2017 |
| ST. George Bellgrove Road Ltd | Real estate | 2022 |
| ST. Giles Courtyard (Heston) Management Company Limited | Households | 2004 |
| ST. James's Management Ltd | Real estate | 2024 |
| ST. Luke's Hospice (Harrow & Brent) Charity Shops Limited | Wholesale & retail | 1989 |
| ST. Luke's Hospice (Harrow & Brent) Ltd. | Health & social care | 1987 |
| ST. Saviours Court Harrow Management Limited | Real estate | 1987 |
| ST1 London Construction Limited | Construction | 2019 |
| ST19 Limited | Construction | 2022 |
| Stable Electrical Limited | Construction | 2011 |
| Stables Gym Ltd | Arts & recreation | 2025 |
| Stabuild Ltd | Construction | 2016 |
| Stacon Ltd | Manufacturing | 2013 |
| Stad-Leo Ltd | Real estate | 2024 |
| Staddlestone Investments Ltd | Professional & scientific | 2024 |
| Stadium Street SR Limited | Construction | 2013 |
| Stadons Ltd | Real estate | 2024 |
| Stae Director Ltd | Administrative & support | 2015 |
| Stagemycar Limited | Wholesale & retail | 2023 |
| Staglane Limited | Real estate | 2025 |
| Staka Legacy Limited | Real estate | 2025 |
| Staks LDN Ltd | Real estate | 2024 |
| Stallion Assets Limited | Health & social care | 2010 |
| Stallion Services Limited | Professional & scientific | 2018 |
| Stalwart Services Limited | Administrative & support | 2002 |
| Stam (London) Limited | Hospitality | 2011 |
| Stam 2 Ltd | Hospitality | 2026 |
| Stamford Street Prop Limited | Real estate | 2025 |
| Stamp Branding and Marketing Agency Limited | Professional & scientific | 2021 |
| Stan Investment Ltd | Real estate | 2020 |
| Stanadec Ltd | Construction | 2019 |
| Standard Health Dorset Limited | Health & social care | 2023 |
| Standard Health Limited | Health & social care | 2011 |
| Standard Health Property Ltd | Real estate | 2017 |
| Standard Health West Yorkshire Limited | Health & social care | 2023 |
| Standard Natural Casings Ltd | Manufacturing | 2015 |
| Standard Press (India) Private Limited | | 2002 |
| Standard Tandoori (Croxley Green) Limited | Hospitality | 2003 |
| Stanford and Stanford Limited | Arts & recreation | 1987 |
| Stanford House Enterprise Limited | Construction | 2019 |
| Stanford Management Limited | Information & communication | 2021 |
| Stanform Limited | Households | 1983 |
| Stanfusion Limited | Transport & logistics | 2017 |
| Stanhope Car Sales Ltd | Wholesale & retail | 2018 |
| Stanila Services Ltd | Transport & logistics | 2024 |
| Stanley & Sons Surfacing Limited | Construction | 2017 |
| Stanley Architects Limited | Professional & scientific | 2012 |
| Stanley Audio Visual Solutions Limited | Other services | 2009 |
| Stanmore Capital Limited | Financial services | 2009 |
| Stanmore HIP and Knee Ltd | Health & social care | 2026 |
| Stanmore Musculo-Skeletal Group LLP | | 2016 |
| Stanmore Quality Services Limited | Administrative & support | 1996 |
| Stanmore Quality Surfacing Limited | Administrative & support | 2021 |
| Stanmore School of Business Limited | Education | 2017 |
| Stanmore TEC Ltd | Real estate | 2018 |
| Stannington Limited | | 2023 |
| Stanstead House RTM Company Limited | Households | 2018 |
| Stapleton Contracts Ltd | Construction | 2023 |
| Star 5 Construction Ltd | Construction | 2024 |
| Star Building & Construction Ltd | Construction | 2014 |
| Star Direct Hospitality Limited | Wholesale & retail | 2017 |
| Star Distribution Limited | Professional & scientific | 2008 |
| Star Distribution UK Limited | Wholesale & retail | 2002 |
| Star Dream Construction Ltd | Construction | 2024 |
| Star Event Management Services Ltd | Administrative & support | 2025 |