| Srrj Logistics Ltd | Transport & logistics | 2025 |
| SRS Investments Ltd | Real estate | 2014 |
| Srst Investment Ltd | Construction | 2020 |
| SRT Property Management Limited | Real estate | 2025 |
| SS 1 Security Ltd | Administrative & support | 2016 |
| SS Building Services Luton Limited | Construction | 2024 |
| SS Carpenters Ltd | Construction | 2025 |
| SS Catering Group Ltd | Hospitality | 2023 |
| SS Civil Ltd | Construction | 2026 |
| SS Consultancy Group Limited | Professional & scientific | 2024 |
| SS Enterprise Luton Limited | Transport & logistics | 2021 |
| SS Food and Wine 2 Ltd | Wholesale & retail | 2023 |
| SS Food and Wine Union Street Limited | Wholesale & retail | 2025 |
| SS Luxury Trading Limited | Wholesale & retail | 2025 |
| SS Motors HR Limited | Wholesale & retail | 2014 |
| SS Rayat Ltd | Construction | 2016 |
| SS Recruiting Private Limited | Information & communication | 2023 |
| SS Security Ltd | Administrative & support | 2016 |
| Ssac Services Ltd | Administrative & support | 2013 |
| SSD Investments Limited | Real estate | 2021 |
| SSD Networks Limited | Information & communication | 2019 |
| Ssdn Dried Flowers Ltd | Wholesale & retail | 2024 |
| SSG Consulting Group Ltd | Professional & scientific | 2026 |
| Ssgas Limited | Construction | 2025 |
| SSH Capital Ltd | Financial services | 2023 |
| SSJ Sushi Bar Limited | Hospitality | 2026 |
| SSK Ecom Ltd | Wholesale & retail | 2025 |
| SSK Locums Limited | Health & social care | 2009 |
| SSK Scans Limited | Health & social care | 2025 |
| SSK UK Services Ltd | Wholesale & retail | 2023 |
| SSM IT Ltd | Information & communication | 2026 |
| SSP Delivery Limited | Transport & logistics | 2024 |
| SSP Housing Ltd | Real estate | 2025 |
| Sspa Edition Ltd | Transport & logistics | 2026 |
| SSR Superstores Ltd | Wholesale & retail | 2025 |
| Ssrp Trading Limited | Wholesale & retail | 2024 |
| SSS Logistics Ltd | Transport & logistics | 2026 |
| Sssf Care Ltd | Health & social care | 2022 |
| SST Services Limited | Construction | 2015 |
| Ssu-Renewables Ltd | Construction | 2020 |
| SSZ Investments Ltd | Real estate | 2023 |
| ST Albans Builder Herts Ltd | Construction | 2017 |
| ST Albans HCW 2 Ltd | Other services | 2024 |
| ST Andrews Close 1972 Limited | Extraterritorial | 2015 |
| ST Austell Ltd | Wholesale & retail | 2021 |
| ST Brides Court Management Limited | Households | 2009 |
| ST Building Construction Ltd | Construction | 2024 |
| ST Foods Distribution Ltd | Wholesale & retail | 2020 |
| ST George's Community Care (GCC) Ltd | Health & social care | 2025 |
| ST Georges Court Dunstable Limited | Construction | 2017 |
| ST Hecs Limited | Administrative & support | 2023 |
| ST Joseph's Parish Centre 2026 CIC | Hospitality | 2026 |
| ST Kitts, Nevis and Friends Community Interest Company | Arts & recreation | 2016 |
| ST Lukes Close Management Company Ltd | Households | 2019 |
| ST Philons Drycleaners Ltd | Other services | 2021 |
| ST Preschool Limited | Health & social care | 2026 |
| ST Print and Embroidery Limited | Manufacturing | 2011 |
| ST Thomas Catholic Academies Trust | Education | 2015 |
| ST Thomas Limited | Professional & scientific | 2007 |
| St-Fx Limited | Arts & recreation | 2004 |
| ST. Mary's Friends Ltd | Public administration | 2020 |
| St.Aims Properties Limited | Real estate | 2022 |
| St.Cassian Ltd | Construction | 2023 |
| STA Investments Limited | Real estate | 2022 |
| STA Medical Services Ltd | Health & social care | 2022 |
| Stables Professional Cleaning Service Ltd | Administrative & support | 2025 |
| Staff Direct Limited | Administrative & support | 2021 |
| Staff Supplies UK Ltd | Real estate | 2022 |
| Stag Traders Ltd | Information & communication | 2022 |
| Stagehouse Limited | Professional & scientific | 2005 |
| Stager Direct Ltd | Wholesale & retail | 2018 |
| Staines Square Management Company Limited | Households | 2006 |
| Staircase Properties Limited | Real estate | 2023 |
| Stakers Court (Harpenden) Limited | Households | 1979 |
| Stan & Stef Ltd | Other services | 2016 |
| Stan Sics Limited | Construction | 2015 |
| Stand by Ltd | Transport & logistics | 2023 |
| Standard Goods Ltd | Wholesale & retail | 2025 |
| Stanf Ltd | Professional & scientific | 2011 |
| Stanf Residential Limited | Real estate | 2024 |
| Stanford Care Limited | Administrative & support | 2014 |
| Stanford Plastering Limited | Construction | 2006 |
| Stanford Property Investor Limited | Financial services | 2014 |
| Staniek Driver Limited | Transport & logistics | 2015 |
| Stanier Center Ltd | Real estate | 2021 |
| Stanier House Ltd | Real estate | 2020 |
| Stanier Ltd | Real estate | 2021 |
| Stanier Shopping Centre Limited | Real estate | 2021 |
| Stanier Square Centre Ltd | Real estate | 2020 |
| Stanier Square Ltd | Real estate | 2020 |
| Stanley Management Services Ltd | Real estate | 2017 |
| Stanley Mechanical Services Ltd | Construction | 2005 |
| Stansted Transport Limited | Administrative & support | 2005 |
| Star Anise Catering Ltd | Hospitality | 2025 |
| Star AST Ltd | Wholesale & retail | 2023 |
| Star Cash & Carry Luton Ltd | Wholesale & retail | 2019 |
| Star Commercial Property Limited | Real estate | 2017 |
| Star Courier Ltd | Transport & logistics | 2021 |
| Star FM Group Ltd | Real estate | 2021 |
| Star Genius Ltd | Manufacturing | 2021 |