| Rscv Limited | Professional & scientific | 2025 |
| RUA Capital Limited | Real estate | 2016 |
| RUA Holdings Limited | Financial services | 2016 |
| RUA Property Developments Limited | Construction | 2016 |
| Rule Recruitment Ltd | Administrative & support | 2014 |
| Russell Grenville Barker Limited | Professional & scientific | 2003 |
| S M Harrop Limited | Construction | 2012 |
| S Uddin & Co Limited | Professional & scientific | 2013 |
| S&M Whole Foods Limited | Wholesale & retail | 2024 |
| S.Ginty Projects Ltd | Professional & scientific | 2021 |
| S.H.Management Company Limited | Households | 1969 |
| S3 Marketing UK Ltd | Administrative & support | 2023 |
| Sabvmf Tech Limited | Information & communication | 2024 |
| SAI Fulfillment Limited | Wholesale & retail | 2024 |
| Saint-Cassien Ltd | Hospitality | 2019 |
| Sajna Nails Limited | Other services | 2019 |
| SAM Alexander Communications Ltd | Professional & scientific | 2023 |
| Samantha Sweet Glass Ltd | Manufacturing | 2020 |
| Samsara Consultancy Limited | Wholesale & retail | 2026 |
| SAN Lorenzo Limited | Hospitality | 1969 |
| Sandford Capital Limited | Real estate | 2016 |
| Sara Real Estate Limited | Real estate | 2024 |
| Satkarma Limited | Real estate | 2018 |
| Sava Capital Limited | Financial services | 2026 |
| School Marketing Photography Ltd | Professional & scientific | 2023 |
| Schuul Ltd | Education | 2023 |
| Scorpion (UK) Limited | Extraterritorial | 2013 |
| Scorpion Electronics Limited | Financial services | 2013 |
| Sean Hanna Putney Limited | Other services | 2009 |
| Security Exhibitions Limited | Administrative & support | 2009 |
| Segue Consulting Ltd | Information & communication | 2012 |
| Sepscan Limited | Manufacturing | 2025 |
| Sequoia Services Limited | Professional & scientific | 2004 |
| Serafin Group Limited | Financial services | 2018 |
| Services (U.K.) Limited | Construction | 2026 |
| Sethi & Co Properties Limited | Real estate | 2025 |
| Sethi Bikes Limited | Manufacturing | 2023 |
| Severus Law LLP | | 2013 |
| SH Executive Search Ltd | Administrative & support | 2014 |
| Shaftesbury DRY Cleaners and Laundry Ltd | Other services | 2026 |
| Shaftesbury Holdings Limited | | 2022 |
| Shahi Caterers Ltd | Hospitality | 2024 |
| Share and Care Homeshare Limited | Health & social care | 2015 |
| Sheela & Sheetal Properties Limited | Real estate | 2020 |
| Shenava Limited | Health & social care | 2025 |
| Shettys and Puree Ltd | Wholesale & retail | 2025 |
| Shirley Orchard Limited | Real estate | 1963 |
| SHJ Wimbledon Ltd | Extraterritorial | 2014 |
| Shooksvensen Limited | Professional & scientific | 2012 |
| Shreeji Consulting Limited | Information & communication | 2018 |
| Shuswap Capital Ltd | Professional & scientific | 2013 |
| Siddhantha Ltd | Information & communication | 2006 |
| Siga Property Ltd | Real estate | 2020 |
| Silver Memories Ltd | Wholesale & retail | 2017 |
| Silverain Developments Limited | Construction | 2023 |
| Simon Ralph Consulting Ltd | Professional & scientific | 2013 |
| Simon Tindall Limited | Information & communication | 2012 |
| Sisua Ltd | Professional & scientific | 2018 |
| Sitenine Limited | Information & communication | 2015 |
| SIX Degrees Advisory LLP | | 2020 |
| Sixty One Circles Limited | Information & communication | 2019 |
| Skarlett Studios Limited | Professional & scientific | 2020 |
| Skillcraft Limited | Arts & recreation | 1986 |
| Skin CHI Beauty Limited | Wholesale & retail | 2024 |
| Sleek Collective Limited | Professional & scientific | 2018 |
| Sleek Events Ltd. | Professional & scientific | 2013 |
| Sleek Group Limited | Financial services | 2022 |
| Sloane Cleaning Services Limited | Other services | 1988 |
| Sloane Street Properties Ltd | Households | 2022 |
| Smart News & Stores Limited | Wholesale & retail | 2022 |
| Snailworks Ltd | Manufacturing | 2022 |
| Snober Marriage Services Ltd | Other services | 2014 |
| Snowik Limited | Construction | 2010 |
| Social Investment Group Ltd | Information & communication | 2023 |
| Sondel Developments Ltd | Construction | 2016 |
| Soundproofing R US Limited | Construction | 2006 |
| Southpaw Capital Ltd | Real estate | 2014 |
| SP Facilities Ltd | Other services | 2019 |
| Spiralled Development Ltd | Information & communication | 2019 |
| Springbox Installations Ltd | Transport & logistics | 2025 |
| SRR Info Limited | Information & communication | 2023 |
| ST John Ambulance Association Ltd | Administrative & support | 2007 |
| Stadden Forbes Financial Planning Ltd | Financial services | 2019 |
| Steppes Property Limited | Real estate | 2025 |
| Stewart Creek Limited | Professional & scientific | 2025 |
| Strathearn Properties Ltd | Construction | 2018 |
| Stretford Holdings Limited | Financial services | 2019 |
| Structural Engineers Reports Limited | Professional & scientific | 2023 |
| Suchi Software Services Ltd | Information & communication | 2023 |
| Surrey Medical Services Ltd | Health & social care | 2021 |
| Svuktech Limited | Information & communication | 2023 |
| SW19 Property Investment Holdings Ltd | Real estate | 2025 |
| SW19 Ventures Limited | Real estate | 2004 |
| SWL Property Ltd | Households | 2010 |
| Talent Link International Limited | Information & communication | 2024 |
| Talis Capital Limited | Financial services | 2011 |
| Talis Community Investments I LLP | | 2020 |
| Talus Partnership Limited | Professional & scientific | 2011 |
| TBS Workspaces Limited | Professional & scientific | 2023 |
| Tcomet Ltd | Manufacturing | 2019 |