| Socius Media Ltd | Administrative & support | 2021 |
| Socode Events Ltd | Real estate | 2023 |
| Sofi&Ya Limited | Transport & logistics | 2025 |
| Soft Spirits Ltd | Manufacturing | 2025 |
| Softcraft Computer Services Limited | Information & communication | 2000 |
| Softly Softly Yoga CIC | Education | 2016 |
| Softpath Limited | Information & communication | 2026 |
| Softsec Ltd | Information & communication | 2020 |
| Softshadow Studios Ltd | Wholesale & retail | 2025 |
| Software Focus Limited | Information & communication | 2004 |
| Sogie Hair Limited | Other services | 2026 |
| Sohaib Khalid Limited | Health & social care | 2021 |
| Soho Wardrobe Limited | Wholesale & retail | 2021 |
| Soil and Soul Norfolk Ltd | Administrative & support | 2022 |
| Sojourn Norfolk Ltd | Real estate | 2025 |
| SOL Power Ltd | Households | 2025 |
| SOL VIN Limited | Professional & scientific | 2017 |
| Solar Architecture Limited | Professional & scientific | 2004 |
| Solar Dividend Ltd | Energy | 2013 |
| Solar Eclipse Installations Limited | Construction | 2012 |
| Solar Equipped Ltd | Construction | 2025 |
| Solar Growth Development Limited | Energy | 2021 |
| Solar Growth Limited | Energy | 2013 |
| Solar Income and Growth Limited | Energy | 2013 |
| Solar Panel Funding Ltd | Administrative & support | 2018 |
| Solar Signs & Graphics Ltd | Professional & scientific | 2015 |
| Solar TEK Renewables Limited | Construction | 2023 |
| Solar Together Ltd | Energy | 2025 |
| SOLAR2U Limited | Construction | 2026 |
| Solaris Biolabs Ltd | Agriculture & fishing | 2024 |
| Solarplicity Smart Systems Limited | Energy | 2018 |
| Sold Brands Limited | Administrative & support | 2020 |
| Solder Creative Limited | Professional & scientific | 2017 |
| Solderflux Ltd | Other services | 2025 |
| Soleberry Advisory Limited | Other services | 2007 |
| Soleil Property Developments Ltd | Construction | 2023 |
| Solemate Ltd | Manufacturing | 2026 |
| Solense Limited | Extraterritorial | 2013 |
| Solhr Consulting Ltd | Administrative & support | 2022 |
| Solid Block Limited | Professional & scientific | 2014 |
| Solid Foundation Properties Ltd | Real estate | 2016 |
| Solinatra UK Limited | Manufacturing | 2020 |
| Sollant Ltd | Wholesale & retail | 2025 |
| Sologic Limited | Professional & scientific | 2011 |
| Solstice Coms Ltd | Extraterritorial | 2022 |
| Solus Facilities Limited | Administrative & support | 2015 |
| Solution Focus Housing Limited | Real estate | 2015 |
| Solution Junkies Limited | Information & communication | 2015 |
| Solutions-Uk Ltd | Administrative & support | 2018 |
| Solvepro Ltd | Wholesale & retail | 2025 |
| Solving-It Solutions Limited | Information & communication | 2012 |
| Solynta UK Limited | Agriculture & fishing | 2019 |
| Som's Maintenance Services Ltd | Other services | 2022 |
| Soma (Anglia) Limited | Construction | 2013 |
| Somalex Ltd | Health & social care | 2022 |
| Some Days Tattoo Ltd | Arts & recreation | 2021 |
| Somercourt Investments Ltd | Professional & scientific | 2009 |
| Somercourt Operations Limited | Professional & scientific | 2009 |
| Somerdale Properties Ltd | Real estate | 2022 |
| Somerville Financial Services Holdings Limited | Financial services | 2023 |
| Somerville Financial Services Limited | Financial services | 1988 |
| Somerville Group Limited | Financial services | 2015 |
| Somewhere Random Ltd. | Information & communication | 2016 |
| Somya Ltd | Manufacturing | 2023 |
| Sona Heat and Plumb Ltd | Construction | 2020 |
| Sonar Link Ltd | Information & communication | 2007 |
| Sonata FM Limited | Administrative & support | 2025 |
| Sonata Security Limited | Administrative & support | 2003 |
| Song Capital Dartco Ltd | Real estate | 2022 |
| Songscribe AI Ltd | Information & communication | 2026 |
| Soni Estates Ltd | Real estate | 2023 |
| Sonic Medical Systems Ltd | Manufacturing | 2007 |
| Sonil's Cafe Ltd | Hospitality | 2024 |
| Sonkai Limited | Manufacturing | 2006 |
| Sonkoue Ltd | Health & social care | 2022 |
| Sonny Investments Limited | Real estate | 2016 |
| Sontec (Electronics) Limited | Manufacturing | 1985 |
| Sontec Holdings Limited | Manufacturing | 1995 |
| Sontec Marketing Limited | Transport & logistics | 2008 |
| Sooc Media Ltd | Information & communication | 2026 |
| Sophex Limited | Financial services | 2006 |
| Sophia Cargo Limited | Transport & logistics | 2011 |
| Sophie Chappell Limited | Construction | 2021 |
| Sophin Ltd | Real estate | 2022 |
| Sophol Solutions Ltd | Information & communication | 2024 |
| Soprano Design (UK) Limited | Information & communication | 2018 |
| Sopwith Court Limited | Real estate | 1990 |
| Sorensen Developments Ltd | Real estate | 2016 |
| Sorensen Tree Consultancy Ltd | Professional & scientific | 2024 |
| Sorsis Limited | Information & communication | 1999 |
| Sorted Transport Limited | Transport & logistics | 2014 |
| SOS Construction Ltd | Construction | 2026 |
| Soshul Media Limited | Professional & scientific | 2022 |
| Sotis Trading Limited | Professional & scientific | 2015 |
| Sotwell Energy Limited | Construction | 2026 |
| Soul Aviation Ltd | Extraterritorial | 2022 |
| Soul Church Ltd | Other services | 2010 |
| Soul Enterprise Trading Ltd | Wholesale & retail | 2017 |
| Soul Juice Supplements Ltd. | Wholesale & retail | 2018 |
| Sound Sleep Holdings Ltd | Financial services | 2025 |