| Spiorre Ltd | Wholesale & retail | 2026 |
| Spirache Ltd | Construction | 2024 |
| Spiratech Construction Limited | Construction | 2013 |
| Spiratech Projects Limited | Construction | 2017 |
| Spire Home (Romford) Ltd | Health & social care | 2020 |
| Spires Consultancy Group Ltd | Professional & scientific | 2025 |
| Spirit Cellar Limited | Wholesale & retail | 2020 |
| Spiritual Renewal Ministry, UK | Other services | 2018 |
| Splendent Tile & Paint Limited | Construction | 2024 |
| Splendid Abode Limited | Real estate | 2019 |
| Splendid Security Limited | Administrative & support | 2019 |
| Spoke Digital Ltd | Information & communication | 2021 |
| Sponsor 360 Ltd | Professional & scientific | 2025 |
| Spooner & Sons GAS & Heating Ltd | Construction | 2025 |
| Sportly Ltd | Arts & recreation | 2025 |
| Sports Capital Ltd | Wholesale & retail | 2020 |
| Sportsland Property Limited | Real estate | 2016 |
| Sporty Tech Ltd | Professional & scientific | 2025 |
| Spotcare Ltd | Health & social care | 2022 |
| SPR Jewellers Ltd | Wholesale & retail | 2025 |
| Spray Station London Ltd | Wholesale & retail | 2024 |
| Spring Court Hanwell Residents' Association Limited | Households | 1963 |
| Spring Leaf Group Ltd | Wholesale & retail | 2025 |
| Spring Trade Centre Ltd | Wholesale & retail | 2025 |
| Springbok Holdings Limited | Real estate | 2017 |
| Springfield Courier Services Ltd | Other services | 2021 |
| Springfields Supported Services Limited | Health & social care | 2014 |
| Springwood Limited | Real estate | 2021 |
| Sprinkled With Love Ltd | Hospitality | 2020 |
| Sprintx Ltd | Wholesale & retail | 2025 |
| Spruce & Spray Ltd | Administrative & support | 2025 |
| Spurgeon Golf Ltd | Arts & recreation | 2018 |
| Spurs IT Ltd | Information & communication | 2013 |
| SPW Services Ltd | Professional & scientific | 2015 |
| SQ 1 Events Limited | Arts & recreation | 2010 |
| SQH Trading Limited | Wholesale & retail | 2018 |
| Squad Fit Ltd | Education | 2022 |
| Square Architectural Ltd | Construction | 2014 |
| Square Cool Ltd | Manufacturing | 2013 |
| Square Eyed Kidd Limited | Information & communication | 2008 |
| Squeaky Clean London Ltd | Administrative & support | 2022 |
| Squirrels Heath Nutrition Limited | Health & social care | 2025 |
| SR Cars Ltd | Wholesale & retail | 2020 |
| SR Consilium Limited | Information & communication | 2017 |
| SR Diamond Limited | Education | 2011 |
| SR Heating&Electrical Ltd | Construction | 2021 |
| Sraj (UK) Ltd | Hospitality | 2013 |
| SRC Support Services Ltd | Administrative & support | 2018 |
| Sreenivasam Ltd | Real estate | 2024 |
| SRI R. V. Limited | Real estate | 2006 |
| Sriconstruction and Building Services Ltd | Construction | 2026 |
| Srik Properties Ltd | Real estate | 2023 |
| Srikar Technologies Ltd | Wholesale & retail | 2019 |
| SRK Investments PVT Ltd | Real estate | 2018 |
| SRM Techno Limited | Information & communication | 2026 |
| SRO Transport Ltd | Transport & logistics | 2024 |
| Sroofing Chik Ltd | Manufacturing | 2026 |
| SRP Medical Ltd | Health & social care | 2015 |
| SRS Logistics and Storage Ltd | Transport & logistics | 2019 |
| SRU - Systems Limited | Information & communication | 2019 |
| Srwl Ltd | Education | 2025 |
| SRZ Accountancy Ltd | Professional & scientific | 2023 |
| SS Financials and Resources Ltd | Professional & scientific | 2022 |
| SS Prime Ltd | Real estate | 2022 |
| SS Property London Limited | Real estate | 2020 |
| SS Sufa Ltd | Construction | 2022 |
| SS Work and Travel Limited | Construction | 2023 |
| SS1 Training Services Limited | Education | 2017 |
| SSA Catering Ltd | Hospitality | 2022 |
| Ssam 75 Ltd | Health & social care | 2026 |
| SSC Euro Market Limited | Hospitality | 2024 |
| SSC Foods Ltd | Wholesale & retail | 2025 |
| SSG Mindforge Ltd | Information & communication | 2022 |
| SSG Support Services Group Ltd | Administrative & support | 2015 |
| SSG UK Investments Limited | Real estate | 2021 |
| SSK Capital Limited | Real estate | 2025 |
| SSK Medical Services Ltd | Health & social care | 2025 |
| SSN Consultants Ltd | Professional & scientific | 2017 |
| SSP Capital Ltd | Financial services | 2020 |
| Sspy Properties Ltd | Real estate | 2017 |
| Sspy Technologies Limited | Information & communication | 2012 |
| Sssa Empire Ltd | Real estate | 2020 |
| Sssa Technologies Ltd | Information & communication | 2018 |
| SSV Developers Ltd | Real estate | 2024 |
| SSW Group Ltd | Construction | 2025 |
| SSY 2018 Ltd | Construction | 2020 |
| SSY Byonex Ltd | Information & communication | 2025 |
| ST 1337 Limited | Construction | 2025 |
| ST George's Guards Limited | Administrative & support | 2006 |
| ST James Court Residents Association (Romford) Limited | Households | 1997 |
| ST John's Management (Moulsham Street) Limited | Real estate | 2006 |
| ST Mary's Lane Residents Association Limited | Households | 2008 |
| ST Matthews Finance Limited | Financial services | 2012 |
| ST Mode Ltd | Manufacturing | 2025 |
| ST Romford Express Ltd | Wholesale & retail | 2022 |
| ST. Martins Place Management Company Limited | Real estate | 2017 |
| ST. Stephen's Capital Limited | Transport & logistics | 2022 |
| STA Accounting Solutions Ltd | Professional & scientific | 2024 |
| Stacks Property Ltd | Real estate | 2026 |
| Stadium Express Limited | Other services | 2024 |