| Solid Scaffolding Berkshire Ltd | Construction | 2020 |
| Solidarity With Refugees Limited | Other services | 2016 |
| Solidfix Ltd | Construction | 2024 |
| Solidify Construct Ltd | Construction | 2024 |
| Solidify Limited | Construction | 2024 |
| Solidify M&E Ltd | Construction | 2024 |
| Solidum Solicitors Limited | Professional & scientific | 2016 |
| Solidus Metals Group Ltd | Manufacturing | 2026 |
| Soliman Holdings Limited | Professional & scientific | 1994 |
| Soliman Travel Limited | Administrative & support | 1984 |
| Solis Rosa Limited | Extraterritorial | 2023 |
| Solisim Ltd | Information & communication | 2025 |
| Solistech Solutions Ltd | Information & communication | 2010 |
| Sollo Design Ltd | Construction | 2023 |
| Solo Arts Entertainment (UK) Ltd | Arts & recreation | 2024 |
| Solo Build Ltd | Construction | 2025 |
| Soloman Accountancy Limited | Professional & scientific | 2018 |
| Solomon Investments (UK) Limited | Real estate | 2013 |
| Solorails Services Ltd | Administrative & support | 2015 |
| Solstice Luxe Ltd | Professional & scientific | 2025 |
| Solucus Limited | Information & communication | 1998 |
| Solum Property Solutions Ltd | Construction | 2025 |
| Solution Carpentry Limited | Construction | 2017 |
| Solution Desk Limited | Information & communication | 2015 |
| Solutions Cleaning Services Limited | Administrative & support | 2006 |
| Solutionstep Limited | Information & communication | 2023 |
| Solutz Ventures Limited | Arts & recreation | 2015 |
| Solventia Limited | Administrative & support | 2001 |
| Solventra Personal Shopping Services Ltd | Wholesale & retail | 2026 |
| Solvira Global Recruitment Ltd | Administrative & support | 2025 |
| Soma Solicitors Ltd | Professional & scientific | 2015 |
| Somadra Limited | Information & communication | 2022 |
| Somak Holidays Limited | Professional & scientific | 1995 |
| Somak Safaris Limited | Professional & scientific | 1995 |
| Somani Enterprises Ltd | Real estate | 2024 |
| Somerhill Court Limited | Health & social care | 2020 |
| Somerhill Dental Practice Limited | Health & social care | 2008 |
| Somerhill Hove Limited | Health & social care | 2022 |
| Somerset Consult Limited | Professional & scientific | 2007 |
| Somerset Dispensing Limited | Wholesale & retail | 2021 |
| Somerset Estates Property Management Ltd | Households | 2019 |
| Somins Limited | Financial services | 2004 |
| Sommar Developments Ltd | Construction | 2023 |
| Sommerville-Haigh Ltd | Real estate | 2016 |
| Soms Importers and Distributors Limited | Wholesale & retail | 2014 |
| Sona Enterprises Ltd | Real estate | 2000 |
| Sona Holding Company Limited | Financial services | 2025 |
| Sona Jogia Properties Limited | Real estate | 2024 |
| Sona Tours Limited | Administrative & support | 2001 |
| Sona Venture Equity Limited | Financial services | 2025 |
| Sonaliza Limited | Health & social care | 2021 |
| Sonani Construction Limited | Construction | 2024 |
| Sonara Ltd | Arts & recreation | 2024 |
| Sonaris Electronic Security Limited | Administrative & support | 2024 |
| Sonata Films Limited | Information & communication | 2021 |
| Sond LUX Investments Ltd | Real estate | 2026 |
| Sondh Estates Ltd | Real estate | 2022 |
| Sondvich Limited | Administrative & support | 2005 |
| Sonest Properties Ltd | Real estate | 2016 |
| Songbird Capital (UK) Ltd | Financial services | 2024 |
| Soni Partnership Limited | Other services | 2015 |
| Sonia Cotton UK Limited | Wholesale & retail | 2024 |
| Sonia Enterprise Limited | Financial services | 1988 |
| Sonia Estates Limited | Real estate | 2004 |
| Sonia Investments Ltd | Real estate | 2019 |
| Sonigra Properties Limited | Real estate | 2021 |
| Sonik Investments Ltd | Real estate | 2019 |
| Sonnik Limited | Manufacturing | 2014 |
| Sonny Martin Limited | Professional & scientific | 2015 |
| Sonnyurol Ltd | Administrative & support | 2018 |
| Sonrisa Dental Ltd | Real estate | 2020 |
| Sons & Co Pharma Ltd | Professional & scientific | 2017 |
| Sonu Limited | Wholesale & retail | 2015 |
| Sonustech Limited | Information & communication | 2017 |
| Sonya K S Ltd | Health & social care | 2018 |
| Soorya B Salon Ltd | Other services | 2023 |
| Soothe-Me Ltd | Wholesale & retail | 2007 |
| Soper Sport Limited | Administrative & support | 2014 |
| Sophia & Associates Limited | Professional & scientific | 2018 |
| Sophia Sinot Ltd | Professional & scientific | 2022 |
| Sophie Neilan Limited | Administrative & support | 2010 |
| Soraj Food Products Ltd | Wholesale & retail | 2003 |
| Soraya Consulting Services Limited | Financial services | 2015 |
| Soreng Limited | Construction | 2024 |
| Sorin Barbu Construction Ltd | Construction | 2019 |
| Sororal Holdings Limited | Financial services | 2023 |
| Sororal Limited | Financial services | 2020 |
| Sorrendo Service Limited | Construction | 2025 |
| Sortedox Electrical Limited | Construction | 2014 |
| Sortela Limited | Professional & scientific | 2018 |
| Soryn Services Ltd | Construction | 2020 |
| Soré AG Limited | Financial services | 2026 |
| Sosuv Consulting Private Limited | Information & communication | 2021 |
| Sotherby Properties Limited | Real estate | 2018 |
| Soul 100 Records Limited | Arts & recreation | 2018 |
| Soul Kitchen Limited | Other services | 2018 |
| Soul of India Tours Limited | Administrative & support | 1996 |
| Sound Cellar Limited | Other services | 1990 |
| Sound Consultancy Ltd | Information & communication | 2023 |
| Sound Immigration Consultants Ltd | Professional & scientific | 2018 |