| Sparrow UK Investments Limited | Real estate | 2026 |
| Spartan Promotions Ltd | Administrative & support | 2025 |
| SPARTAN121 Nutrition Ltd | Arts & recreation | 2021 |
| Spartech Ltd | Information & communication | 2020 |
| SPD Partners Limited | Professional & scientific | 2021 |
| Speakwise Ltd | Education | 2025 |
| Spear Capital Limited | Financial services | 2021 |
| Special and Unique Ltd | Wholesale & retail | 2017 |
| Specialised Windows Limited | Construction | 1997 |
| Specialist Hire Services Limited | Administrative & support | 2007 |
| Specialist P W Limited | Extraterritorial | 2024 |
| Specialist Rail Engineering Solutions Ltd | Professional & scientific | 2015 |
| Specialist Routing Solutions Ltd | Information & communication | 2024 |
| Specialist Vehicle Group Ltd | Wholesale & retail | 2024 |
| Speckulation Entertainment Ltd | Arts & recreation | 2008 |
| Specstar Ltd | Arts & recreation | 2011 |
| Spectrum of Spice Ltd | Manufacturing | 2018 |
| Speculis Ltd | Administrative & support | 2022 |
| Speed Cabling Ltd | Construction | 2019 |
| Speed Electrical Services Ltd | Construction | 2016 |
| Speed Trans REV Ltd | Transport & logistics | 2025 |
| Speedchilli Limited | Information & communication | 2007 |
| Speedmap Ltd | Wholesale & retail | 2025 |
| Speedmarch Limited | Hospitality | 1982 |
| Speeds GX | Wholesale & retail | 2002 |
| Speedy Domestic Limited | Other services | 2024 |
| Speedy Garage Doors Ltd | Construction | 2020 |
| Speedy HEN Limited | Administrative & support | 2009 |
| Speedyfix Auto 24/7 Ltd | Wholesale & retail | 2026 |
| Speedysilver Solutions Ltd | Information & communication | 2013 |
| Spellcrest Limited | Information & communication | 2006 |
| Spence Refit Ltd | Construction | 2005 |
| Spencer Gleave Limited | Information & communication | 2009 |
| Spencer’S Value Mart Limited | Wholesale & retail | 2026 |
| Spencomms Limited | Information & communication | 2023 |
| Spera Robotics Ltd | Information & communication | 2026 |
| Sphiti Limited | Professional & scientific | 2025 |
| Spiced in Watford Ltd | Hospitality | 2026 |
| Spicedaani Foods Limited | Wholesale & retail | 2024 |
| Spider Controls Ltd | Construction | 2021 |
| Spider Original Limited | Manufacturing | 2023 |
| Spider Trick - Digital Construction Ltd | Manufacturing | 2025 |
| Spikenard & Alabaster Ltd | Wholesale & retail | 2025 |
| Spill Risk Solutions Ltd | Wholesale & retail | 2008 |
| Spinavid Limited | Information & communication | 1987 |
| Spinerad Limited | Health & social care | 2010 |
| Spinetail Ltd | Construction | 2022 |
| Spinfix Express Ltd | Wholesale & retail | 2026 |
| Spinfix Ltd | Wholesale & retail | 2025 |
| Spinflip Ltd | Information & communication | 2016 |
| Spinning Plates Media Ltd | Information & communication | 2019 |
| Spinny Nights Ltd | Arts & recreation | 2020 |
| Spiral Revision Ltd | Information & communication | 2025 |
| Spiravex Limited | Professional & scientific | 2026 |
| Spirefilms Limited | Information & communication | 2026 |
| Spkgas Limited | Extraterritorial | 2011 |
| Splash Exteriors Ltd | Administrative & support | 2014 |
| Splendid ( Euston) Limited | Hospitality | 2022 |
| Splendid (Hounslow) LLP | | 2023 |
| Splendid (Park Royal) Ltd | Real estate | 2022 |
| Splendid (West London) Ltd | Hospitality | 2022 |
| Splendid (Worcester Park) LLP | | 2022 |
| Splendid Boghani Foundation Trustee Limited | Other services | 2024 |
| Splendid Care Holdings Limited | Financial services | 2026 |
| Splendid Chai Limited | Hospitality | 2025 |
| Splendid Finance Limited | Financial services | 2025 |
| Splendid Group Holdings Limited | Financial services | 2026 |
| Splendid Healthcare Ltd | Health & social care | 2021 |
| Splendid Holdings Ltd | Financial services | 2021 |
| Splendid Horsham Manor Limited | Real estate | 2026 |
| Splendid Hospitality Group LLP | | 2007 |
| Splendid Hospitality Holdings Ltd | Hospitality | 2022 |
| Splendid Hotels Limited | Hospitality | 2025 |
| Splendid Plymouth Limited | Financial services | 2025 |
| Splendid Projects Limited | Construction | 2024 |
| Splendid Real Estate Limited | Real estate | 2022 |
| Splendid Regal Limited | Financial services | 2026 |
| Splendid Regal Nominee Limited | Financial services | 2026 |
| Splendid Restaurants (Colonel) Ltd | Hospitality | 2016 |
| Splendid Restaurants (Harland) Limited | Hospitality | 2017 |
| Splendid Tanner ROW Limited | Real estate | 2026 |
| Splendid WP Limited | Hospitality | 2026 |
| Splendor Beauty Lounge Ltd | Other services | 2018 |
| Splendor Spices Ltd | Wholesale & retail | 2024 |
| Splendour Wholesale Limited | Hospitality | 2015 |
| Splicesquad Ltd | Information & communication | 2023 |
| SPM Surveying Limited | Construction | 2018 |
| Sponsecure Ltd | Professional & scientific | 2025 |
| Sport in Schools Limited | Arts & recreation | 2006 |
| Sports Integrated Limited | Professional & scientific | 2010 |
| Sports Medica Limited | Wholesale & retail | 2016 |
| Spotted Monkey Limited | Information & communication | 2017 |
| Spow-Art Studios Ltd | Wholesale & retail | 2024 |
| SPR Procurement Consultancy Limited | Administrative & support | 2015 |
| Spread Love Lighting Limited | Professional & scientific | 2012 |
| Spring Breez Limited | Health & social care | 2024 |
| Spring Forwards Intl Limited | Professional & scientific | 2012 |
| Spring Management Ltd | Professional & scientific | 2010 |
| Springall Allen Partnership Limited | Administrative & support | 2011 |
| Springbok Holdco Ltd | Health & social care | 2025 |