| SNT Rentals Ltd | Real estate | 2023 |
| Snth Group Ltd | Real estate | 2024 |
| Snug Properties Ltd | Extraterritorial | 2007 |
| Snug Yorkshire Ltd | Real estate | 2025 |
| Snugbug Furniture Ltd. | Wholesale & retail | 2012 |
| Snugdom Eco Ltd | Construction | 2025 |
| Snugnestproperty Ltd | Real estate | 2025 |
| Snydale Brickworks Limited | Extraterritorial | 1955 |
| Snydale RDA | Education | 2014 |
| SO Agency Limited | Professional & scientific | 2017 |
| SO Contented Ltd | Information & communication | 2018 |
| SO Inc Ltd | Wholesale & retail | 2020 |
| SO Pilates Limited | Arts & recreation | 2009 |
| So-Safe Lifting Limited | Manufacturing | 2012 |
| Soarce Ltd | Wholesale & retail | 2018 |
| Soaring With Didi Ltd | Wholesale & retail | 2025 |
| Soas Legal Ltd | Professional & scientific | 2024 |
| Soaz Properties Ltd | Real estate | 2024 |
| Sober Investments Ltd | Real estate | 2025 |
| Soberly Ltd | Hospitality | 2024 |
| Sobhy Medical Ltd | Health & social care | 2024 |
| SOC Holdings Ltd | Professional & scientific | 2017 |
| Soca Village Ltd | Arts & recreation | 2019 |
| Social Business Brokers CIC | Administrative & support | 2010 |
| Social Care Learning Academy Ltd | Professional & scientific | 2021 |
| Social Folk Limited | Professional & scientific | 2021 |
| Social Governance Solutions Limited | Administrative & support | 2023 |
| Social Hyve Ltd | Professional & scientific | 2025 |
| Social Jaguar Limited | Administrative & support | 2020 |
| Social Media Geek Limited | Professional & scientific | 2019 |
| Social Media Systems Ltd | Information & communication | 2026 |
| Social Prescriptions Limited | Health & social care | 2016 |
| Social Script Ltd | Wholesale & retail | 2021 |
| Socialpostxr Ltd | Information & communication | 2026 |
| Socity (Leeds) Limited | Construction | 2017 |
| Socity Limited | Construction | 2017 |
| Socity Living Ltd | Real estate | 2019 |
| Socity Workspace Ltd | Real estate | 2019 |
| Soda IT Support (South) Limited | Wholesale & retail | 2023 |
| Sofaro Ltd | Wholesale & retail | 2025 |
| Soff Bidco Limited | Financial services | 2024 |
| Sofia Estates Ltd | Real estate | 2025 |
| Sofia RTA Scrap Ltd | Wholesale & retail | 2026 |
| Sofire Ltd | Other services | 2010 |
| Sofra Express WF5 Limited | Hospitality | 2026 |
| Soft Actions Ltd | Information & communication | 2023 |
| Soft Tech Solutions Private Ltd | Information & communication | 2013 |
| Softandlight Skin Ltd | Other services | 2025 |
| Softcode Solutions Ltd | Information & communication | 2019 |
| Softmeer Ltd | Professional & scientific | 2025 |
| Softnexus Technologies Ltd | Information & communication | 2026 |
| Software Cloud Limited | Information & communication | 2014 |
| Software Solutions Consultancy Limited | Information & communication | 2016 |
| Software Technologies Consulting Limited | Information & communication | 2022 |
| SOFTWARE2 Group Ltd | Administrative & support | 2019 |
| SOFTWARE2 Holdings Ltd | Financial services | 2020 |
| SOFTWARE2 Limited | Administrative & support | 2021 |
| Soil Hill Quarries (Yorkshire) Limited | Mining & quarrying | 2017 |
| Soildri Group Holdings Limited | Financial services | 2025 |
| Soildri Limited | Construction | 2023 |
| Soildri Plant Hire Limited | Administrative & support | 2025 |
| Soins & Sante Ltd | Health & social care | 2014 |
| Soka Partners Ltd | Administrative & support | 2025 |
| Sokhi Group Ltd | Construction | 2025 |
| Sokhi Properties Ltd | Real estate | 2024 |
| Sokhi Trading Ltd | Other services | 2024 |
| Sokhi Woodworks Specialist Limited | Construction | 2016 |
| Soko Solutions Limited | Transport & logistics | 2015 |
| SOL Physio Limited | Health & social care | 2022 |
| Sol-Teq Limited | Construction | 2022 |
| Solace Loss Adjusting Limited | Financial services | 2024 |
| Solace Security Ltd | Other services | 2024 |
| Solace Surviving Exile and Persecution | Health & social care | 2003 |
| Solanum Bidco Limited | Financial services | 2025 |
| Solar BB Ltd | Manufacturing | 2020 |
| Solar Bits Limited | Other services | 2017 |
| Solar Future Limited | Construction | 2024 |
| Solar Investment Group Ltd | Construction | 2017 |
| Solar SAV Limited | Professional & scientific | 2024 |
| SOLAR4BUSINESS Limited | Construction | 2024 |
| Solarbond Limited | Construction | 2022 |
| Solart Lines Limited | Wholesale & retail | 2017 |
| Solarte Properties Limited | Real estate | 2021 |
| Soldfast Property Limited | Real estate | 2018 |
| Soldinaday.Co.Uk Limited | Real estate | 2020 |
| Sole Capture Ltd | Professional & scientific | 2025 |
| Solec Energy Solutions Ltd | Construction | 2010 |
| Solecco Solar Ltd | Professional & scientific | 2016 |
| Solera Global Technology Limited | Information & communication | 2019 |
| Soletrekker Ltd | Wholesale & retail | 2020 |
| Solibri UK Ltd | Information & communication | 2012 |
| Solicitassist Limited | Professional & scientific | 2007 |
| Solid 3D Design Limited | Professional & scientific | 2016 |
| Solid AS a Lock Ltd | Manufacturing | 2011 |
| Solid Developers Limited | Information & communication | 2018 |
| Solid Income Limited | Professional & scientific | 2018 |
| Solid Lofts Limited | Construction | 2026 |
| Solid Sounds Hifi Ltd | Wholesale & retail | 2024 |
| Solidrock Technology Limited | Information & communication | 2017 |
| Solidspeed Limited | Transport & logistics | 1999 |