| Strategic Financial Management Solutions Ltd | Professional & scientific | 2012 |
| Strategium Enterprises Ltd | Administrative & support | 2020 |
| Strategizebiz Limited | Administrative & support | 2024 |
| Stratford Caledonian Limited | Information & communication | 2011 |
| Stratum Engineering Ltd | Professional & scientific | 2020 |
| Stream Engineering Limited | Administrative & support | 2011 |
| Streamers Streamers Limited | Professional & scientific | 2025 |
| Street and Co Cafe Ltd | Hospitality | 2025 |
| Street BOY Ltd | Professional & scientific | 2024 |
| Stress Free Property Management Limited | Households | 2025 |
| Strickland Enterprises Holdings Limited | Financial services | 2020 |
| Strickland Enterprises Limited | Real estate | 2017 |
| Stronger Together Forum Limited | Other services | 2026 |
| Stronghold Estates Limited | Construction | 1970 |
| Strongs Investments Limited | Real estate | 2020 |
| Structure TEC (UK) Limited | Construction | 2008 |
| Struo Limited | Information & communication | 2005 |
| Strutt Property Holdings Limited | Real estate | 2017 |
| Struttegic Accounting Ltd | Professional & scientific | 2025 |
| Stuart Wylie Decorators Limited | Construction | 2018 |
| Stuart Wylie Maintenance Limited | Construction | 2021 |
| Studio 360 Fitness Holdings Limited | Arts & recreation | 2017 |
| Studio Jazz Ltd | Information & communication | 2025 |
| Stunt Co-Ordination Ltd | Extraterritorial | 2020 |
| Stunt Flying Ltd | Information & communication | 2012 |
| Stunt Supply Ltd | Wholesale & retail | 2022 |
| Style and Stillness Ltd | Other services | 2025 |
| Style Savvy Limited | Other services | 2009 |
| Stylish Cutz Ltd | Other services | 2023 |
| Stylus Bespoke Ltd | Manufacturing | 2019 |
| SUB Base Ltd | Construction | 2022 |
| Suchew Limited | Hospitality | 2024 |
| Sugg Estates Limited | Real estate | 2025 |
| SUGR3SSS Enterprise Ltd | Real estate | 2024 |
| Suhastaah Ltd | Construction | 2024 |
| Suisse Assist Limited | Administrative & support | 2026 |
| Suiteplace Ltd | Real estate | 2019 |
| Sukh Beauty Limited | Arts & recreation | 2017 |
| Sumadh Investments Ltd | Real estate | 2019 |
| Sumadh Limited | Information & communication | 2015 |
| Summer Colours Limited | Wholesale & retail | 2010 |
| Summit Interiors (Essex) Limited | Construction | 2025 |
| Summit Technologies Ltd | Information & communication | 2007 |
| Sun Kissed Glow Limited | Health & social care | 2022 |
| Sunbeam ABA Limited | Health & social care | 2024 |
| Sunflower Bistro Ltd | Hospitality | 2024 |
| Sunfly Management Ltd | Professional & scientific | 2025 |
| Sunnycliff House Limited | Real estate | 1989 |
| Sunrise Property Limited | Real estate | 2017 |
| Sunset Park Consulting Limited | Administrative & support | 2020 |
| Supa Value Ltd | Real estate | 2025 |
| Super* Trading Ltd | Wholesale & retail | 2018 |
| Superior Roofing Limited | Administrative & support | 2009 |
| Supermegacorp Ltd | Information & communication | 2020 |
| Supper Trading Limited | Administrative & support | 2010 |
| Supported Environments for Empowered Needs South East Essex Limited | Health & social care | 2026 |
| Supported Tenancy & Empowerment Programme Limited | Real estate | 2026 |
| Supreme Construction Services Ltd | Construction | 2003 |
| Supremo Services Ltd | Administrative & support | 2025 |
| Surf Rayleigh Limited | Hospitality | 2025 |
| Surrey Hills Coaching & Consulting Limited | Professional & scientific | 2020 |
| Surrey Scrap Metal Merchants Limited | Administrative & support | 2023 |
| Survey & Restore Property Services Limited | Construction | 2021 |
| Sutherland Place Management Company Limited | Households | 1991 |
| Sutton-Richards Design & Build Ltd | Construction | 2011 |
| SW15H Limited | Professional & scientific | 2010 |
| SWA Holdings Limited | Other services | 2025 |
| Swallow Aquatics Online Ltd | Wholesale & retail | 2025 |
| Swan Training and Development Ltd | Education | 2020 |
| Swap Bars Limited | Wholesale & retail | 2001 |
| Swatridge Bailey Ltd | Financial services | 2021 |
| Sway AS Limited | Information & communication | 2020 |
| Sweetie Bouquets Limited | Wholesale & retail | 2017 |
| Swift Dent Engineering Services Limited | Manufacturing | 2013 |
| Sword of Damocles Limited | Extraterritorial | 2020 |
| SX Interiors Ltd | Construction | 2021 |
| Symbytec Limited | Information & communication | 2009 |
| Symmetry Health and Safety Ltd | Public administration | 2012 |
| Synergy Technical Management Limited | Construction | 2024 |
| Synthetica Intelligence Ltd | Information & communication | 2026 |
| Synvitech Limited | Information & communication | 2020 |
| Systemic Strategy Consulting Limited | Professional & scientific | 2023 |
| Szewczuk Ecom Limited | Wholesale & retail | 2025 |
| T & E UK Holdings Limited | Real estate | 2022 |
| T & G Commercial Property Ltd | Real estate | 2024 |
| T & J Chilled Distribution Ltd | Transport & logistics | 2015 |
| T & R Adams Investments Limited | Real estate | 2017 |
| T & S Bathrooms & Tiles Ltd. | Construction | 2007 |
| T C E Accountancy Services Ltd | Professional & scientific | 2011 |
| T D Wright Ltd | Construction | 2018 |
| T Gwillim Electrical Limited | Construction | 2015 |
| T J E Investments Limited | Real estate | 2017 |
| T L C Inns Limited | Hospitality | 2005 |
| T Mccarthy Electrical Limited | Construction | 2014 |
| T Purcell Roofing Limited | Construction | 2007 |
| T S Tree Care Limited | Agriculture & fishing | 2020 |
| T&E Carpentry and Building Ltd | Construction | 2026 |
| T&N Property Limited | Real estate | 2025 |
| T&T Property Ventures Ltd | Real estate | 2025 |
| T-Scape Limited | Information & communication | 2013 |