| SMC Hospitality LLP | | 2025 |
| SMC Mraf Limited | Information & communication | 2023 |
| SMC Music Rights LLP | | 2025 |
| SME Tax Ltd | Professional & scientific | 2020 |
| SMG Partnership Limited | Extraterritorial | 2025 |
| Snapshop Limited | Wholesale & retail | 2016 |
| SNJ Group Ltd | Hospitality | 2024 |
| SNO Enterprises Ltd | Other services | 2021 |
| Snowberry Lakes Limited | Arts & recreation | 1996 |
| SO Sound Limited | Information & communication | 2002 |
| Sock Subs Ltd | Wholesale & retail | 2020 |
| Sohian Natural Resources Ltd | Other services | 2018 |
| Solomon's Financial Services Limited | Extraterritorial | 1999 |
| Solus Decor UK Ltd | Administrative & support | 2015 |
| Solvia Digital EU Ltd | Information & communication | 2025 |
| Sonam.Ai Ltd | Water & waste | 2024 |
| Sonder Automotive Ltd | Hospitality | 2024 |
| Sonotronic (UK) Limited | Manufacturing | 2002 |
| Soundreal Ltd | Information & communication | 2022 |
| Sounds Like a HIT Limited | Information & communication | 2000 |
| Sourdough South Limited | Hospitality | 2017 |
| South Thames Plumbing & Heating Limited | Construction | 2018 |
| Southwood Court (Knaphill) Limited | Households | 1995 |
| Sovereign Film Distribution Limited | Information & communication | 2011 |
| Sovereign Film Investments Limited | Information & communication | 2009 |
| Sovereign Film Management Limited | Information & communication | 2008 |
| Sovereign Film Production Limited | Information & communication | 2015 |
| Sovereign Film Releasing Limited | Information & communication | 2013 |
| Sovereign Film Star Sailor Limited | Information & communication | 2013 |
| Sovereign Film Ursa Major Limited | Information & communication | 2013 |
| Sovereign Films Effie Limited | Information & communication | 2010 |
| Sovereign Films Gordon Limited | Information & communication | 2011 |
| Sovereign Films Limited | Information & communication | 2005 |
| Sovereign Films Wyeth Limited | Information & communication | 2010 |
| Sovereign Media Capital Limited | Professional & scientific | 2011 |
| Sovereign Media Group Limited | Financial services | 2008 |
| Sovereign Media Management Limited | Professional & scientific | 2020 |
| Sovereign Music Limited | Information & communication | 2015 |
| Sovereign Music Publishing Limited | Information & communication | 2010 |
| Space Goat Limited | Professional & scientific | 2024 |
| Space Race Project Limited | Financial services | 2014 |
| Space WK Ltd | Construction | 2025 |
| Spaces to Places Ltd | Administrative & support | 2019 |
| Spacivity Ltd | Information & communication | 2025 |
| Specle Limited | Information & communication | 2006 |
| Spidergrams Limited | Education | 2014 |
| Spires Estates Limited | Financial services | 2004 |
| Spires Sports Limited | Real estate | 1938 |
| Spoke (Interactive) Limited | Information & communication | 1989 |
| Spot the GAP Ltd | Professional & scientific | 2018 |
| Springfield Hill Limited | Other services | 2012 |
| SRC Design Limited | Professional & scientific | 2026 |
| SSR Seven General Partner Limited | Professional & scientific | 2007 |
| ST Edward Homes Number Five Limited | Extraterritorial | 2007 |
| ST Edward Homes Number Four Limited | Extraterritorial | 2007 |
| ST Edward Homes Number One Limited | Extraterritorial | 2007 |
| ST Edward Homes Number Two Limited | Extraterritorial | 2007 |
| ST Edward Homes Partnership Freeholds Limited | Real estate | 2014 |
| ST Edward Limited | Extraterritorial | 2006 |
| ST Edward Strand Partnership Freeholds Limited | Real estate | 2014 |
| ST George (Crawford Street) Limited | Extraterritorial | 1999 |
| ST George (Queenstown Place) Limited | Extraterritorial | 1999 |
| ST George Blackfriars Limited | Construction | 2005 |
| ST George Central London Limited | Real estate | 2000 |
| ST George City Limited | Construction | 2005 |
| ST George Commercial Limited | Professional & scientific | 1987 |
| ST George Developments Limited | Extraterritorial | 2005 |
| ST George Ealing Limited | Construction | 2013 |
| ST George Kings Cross Limited | Extraterritorial | 2001 |
| ST George Little Britain (NO. 1) Limited | Extraterritorial | 1993 |
| ST George Little Britain (NO.2) Limited | Extraterritorial | 1993 |
| ST George North London Limited | Construction | 1994 |
| ST George Northfields Limited | Construction | 2005 |
| ST George PLC | Construction | 1991 |
| ST George Project Management Limited | Extraterritorial | 1989 |
| ST George Real Estate Limited | Extraterritorial | 1996 |
| ST George Regeneration Limited | Professional & scientific | 1999 |
| ST George South and Central London Limited | Professional & scientific | 1988 |
| ST George South London Ltd | Construction | 1994 |
| ST George West London Ltd | Construction | 1985 |
| ST George Wharf (Block B) Limited | Extraterritorial | 2000 |
| ST George Wharf (Block C) Limited | Extraterritorial | 2000 |
| ST George Wharf Car Park Limited | Extraterritorial | 2000 |
| ST James Group Limited | Construction | 1996 |
| ST James Homes (Grosvenor Dock) Limited | Real estate | 2000 |
| ST Joseph Homes Limited | Construction | 2014 |
| ST William Eight Limited | Extraterritorial | 2017 |
| ST William Eighteen Limited | Extraterritorial | 2018 |
| ST William Eleven Limited | Extraterritorial | 2017 |
| ST William Fifteen Limited | Extraterritorial | 2017 |
| ST William Five Limited | Financial services | 2017 |
| ST William Four Ltd | Extraterritorial | 2017 |
| ST William Fourteen Limited | Extraterritorial | 2017 |
| ST William Holdings Limited | Financial services | 2018 |
| ST William Homes LLP | | 2014 |
| ST William Nine Limited | Financial services | 2017 |
| ST William Nineteen Limited | Extraterritorial | 2018 |
| ST William One Ltd | Financial services | 2017 |
| ST William Seven Limited | Extraterritorial | 2017 |
| ST William Seventeen Limited | Financial services | 2018 |