| Sound Taxis Ltd | Transport & logistics | 2024 |
| Soundasleep Ltd | Other services | 2015 |
| Soundheart Limited | Arts & recreation | 2010 |
| Soundhouse Live Limited | Arts & recreation | 2022 |
| Sounds Ignite Ltd | Information & communication | 2023 |
| Sounds Posh Ltd | Information & communication | 2012 |
| Souper Joy Ltd | Hospitality | 2024 |
| Source Circle Ventures Ltd | Financial services | 2024 |
| Source Design Direct UK Limited | Professional & scientific | 2017 |
| Source Garments Ltd | Manufacturing | 2019 |
| Source Partnerships Ltd | Professional & scientific | 2010 |
| Source Phoenix UK Ltd | Wholesale & retail | 2020 |
| Source Retail Limited | Wholesale & retail | 2024 |
| Source Service & Construction Ltd | Construction | 2016 |
| Sourcecircle Group Limited | Financial services | 2021 |
| Sourcecircle Holdings Limited | Financial services | 2016 |
| Sourcecircle Limited | Financial services | 1990 |
| Sourced Apparel Limited | Manufacturing | 2021 |
| Sourced by US Limited | Wholesale & retail | 2023 |
| Sourced Spaces Ltd | Administrative & support | 2024 |
| Sourcedeal Ltd | Real estate | 2024 |
| Sourcing & Building Group Limited | Real estate | 2024 |
| Sourmilk Studios Ltd | Information & communication | 2025 |
| Souter Bathrooms Limited | Construction | 2012 |
| South Asian Supernovas Ltd | Health & social care | 2023 |
| South Kensington Club Ltd | Hospitality | 2013 |
| South Knighton News Limited | Wholesale & retail | 2023 |
| South Leicestershire Homes Ltd | Real estate | 2023 |
| South Leicestershire Islamic Community | Health & social care | 2022 |
| South Midland Connect Community Interest Company | Transport & logistics | 2011 |
| South Normanton Tudors (Management Company) Limited | Real estate | 2008 |
| South Pacific Heights Limited | Households | 1999 |
| South Parade Mansions Residents Ltd | Hospitality | 2016 |
| South Southwest Limited | Information & communication | 2013 |
| South Western Tool Supplies Limited | Wholesale & retail | 1987 |
| South Wigston Cycle Centre Limited | Wholesale & retail | 2010 |
| South Yorkshire Micro Bars Ltd | Hospitality | 2024 |
| SOUTH57 Construction Recruitment Ltd | Administrative & support | 2012 |
| SOUTH57 Group Ltd | Financial services | 2024 |
| SOUTH57 Highways & Traffic Management Ltd | Construction | 2024 |
| SOUTH57 Partnership Ltd | Administrative & support | 2013 |
| Southam Smiles Limited | Health & social care | 2020 |
| Southbound Media Limited | Professional & scientific | 2015 |
| Southburn Teamwork Ltd | Hospitality | 2015 |
| Southdown Group Ltd | Construction | 2023 |
| Southern Construction & Civil Engineering Limited | Wholesale & retail | 2006 |
| Southern Energy Limited | Energy | 2017 |
| Southern Link Consultants Limited | Professional & scientific | 2025 |
| Southern Spices Caters Limited | Hospitality | 2024 |
| Southern Spices Leicester Limited | Hospitality | 2023 |
| Southesk Communications Limited | Professional & scientific | 2000 |
| Southfield Autos Ltd | Wholesale & retail | 2020 |
| Southfield Lettings Ltd | Real estate | 2022 |
| Southfields Experts Ltd | Transport & logistics | 2015 |
| Southfields Health and Fitness Training Limited | Other services | 2003 |
| Southlake Electronics Limited | Manufacturing | 1976 |
| Southmeads Properties Ltd | Real estate | 2019 |
| Southmoor Triumphs Ltd | Transport & logistics | 2015 |
| Southpark Scenery Limited | Construction | 2023 |
| Southtrade Ltd | Wholesale & retail | 2019 |
| Southview Court Limited | Households | 1993 |
| Sova Healthcare Leicester Ltd | Health & social care | 2013 |
| Sovereign Exhibitions & Events Limited | Administrative & support | 2013 |
| Sovereign Financial Planners (Holdings) Ltd | Real estate | 2026 |
| Sovereign Financial Planners Limited | Financial services | 2015 |
| Sovereign Gears Limited | Manufacturing | 1997 |
| Sovereign Hris Consulting Limited | Professional & scientific | 2014 |
| Sovereign Lions Real Estate Ltd | Real estate | 2024 |
| Sovereign Modular Buildings Limited | Administrative & support | 2020 |
| Soverein Real Estates Ltd | Real estate | 2024 |
| Sovi Transport Ltd | Transport & logistics | 2025 |
| Sovlak Ltd | Hospitality | 2025 |
| Sowden & Co Limited | Real estate | 1950 |
| Sowden Developments Limited | Construction | 1993 |
| Sowden Group Limited | Construction | 1989 |
| Sowden Investments Limited | Real estate | 1997 |
| Sowess Legal Search Ltd | Administrative & support | 2024 |
| Sowinn Ltd | Arts & recreation | 2025 |
| SP & KO Ltd | Professional & scientific | 2023 |
| SP Aircon Ltd | Construction | 2020 |
| SP Aldrich Limited | Wholesale & retail | 2020 |
| SP Alpha Limited | Real estate | 2017 |
| SP BOW Limited | Hospitality | 2022 |
| SP Builders Group Ltd | Construction | 2024 |
| SP Bulk Ltd | Manufacturing | 2026 |
| SP Crescere Ltd | Real estate | 2025 |
| SP Devani Ltd | Wholesale & retail | 2017 |
| SP Developments (Barwell) Ltd | Manufacturing | 2005 |
| SP Electrical Installations Ltd | Construction | 2024 |
| SP Imitari Ltd | Health & social care | 2022 |
| SP Kaval Partners Limited | Real estate | 2024 |
| SP Legal Services Ltd | Professional & scientific | 2024 |
| SP Pizza Limited | Hospitality | 2020 |
| SP Portfolio Management Limited | Real estate | 2021 |
| SP Textile Ltd | Manufacturing | 2022 |
| SP Unified Solutions Ltd | Professional & scientific | 2026 |
| SP United Group Ltd | Wholesale & retail | 2025 |
| Sp&Bm Ltd | Wholesale & retail | 2022 |
| Sp&L Property Services Limited | Construction | 2024 |
| SP02 Ltd | Real estate | 2024 |