| Success Blueprints Ltd | Wholesale & retail | 2015 |
| Success Unique Products Limited | Wholesale & retail | 2021 |
| Sudama Autotrader Ltd | Wholesale & retail | 2026 |
| Suffolk Activities Ltd | Arts & recreation | 2008 |
| Suffolk Blinds & Shutters Limited | Other services | 2018 |
| Suffolk Blinds Limited | Other services | 2018 |
| Suffolk Bookkeeping Limited | Professional & scientific | 2024 |
| Suffolk Building Design Ltd | Professional & scientific | 2020 |
| Suffolk Burger OFF Limited | Hospitality | 2020 |
| Suffolk Business Park (Holdings) Ltd | Construction | 2014 |
| Suffolk Coast Hospitality Ltd | Hospitality | 2026 |
| Suffolk Commercial Cleaning Ltd | Administrative & support | 2018 |
| Suffolk Developments Ltd | Construction | 2024 |
| Suffolk Eateries Ltd | Administrative & support | 2017 |
| Suffolk Eco Travel Ltd | Transport & logistics | 2025 |
| Suffolk Electrical Design Ltd | Professional & scientific | 2021 |
| Suffolk Electrical Services Ltd | Construction | 2023 |
| Suffolk Electrical Solutions Ltd | Construction | 2021 |
| Suffolk Electrical Support Services Limited | Construction | 2024 |
| Suffolk Glazing Repairs Ltd | Manufacturing | 2011 |
| Suffolk House (BSE) Management Limited | Households | 2015 |
| Suffolk Implant Centre Limited | Health & social care | 2010 |
| Suffolk Insignia Ltd | Manufacturing | 2022 |
| Suffolk Kitchens Limited | Extraterritorial | 2006 |
| Suffolk Market Events Limited | Other services | 2021 |
| Suffolk Monkey Limited | Professional & scientific | 2022 |
| Suffolk Plumbing Solutions Ltd | Construction | 2024 |
| Suffolk Properties Limited | Real estate | 2015 |
| Suffolk Property Holdings Ltd | Real estate | 2020 |
| Suffolk Psychotherapeutics Limited | Health & social care | 2006 |
| Suffolk Real Estates Ltd | Real estate | 2026 |
| Suffolk Reclamation Ltd | Administrative & support | 2020 |
| Suffolk Secret Limited | Real estate | 2003 |
| Suffolk Security Syndicate Ltd | Administrative & support | 2025 |
| Suffolk Story Ltd | Arts & recreation | 2026 |
| Suffolk Stove Installations Limited | Construction | 2023 |
| Suffolk Timber Ltd | Wholesale & retail | 2015 |
| Suffolk Timber Sheds Ltd | Manufacturing | 2021 |
| Suffolk Transmissions Ltd | Wholesale & retail | 2018 |
| Suffolk Trimmers Limited | Manufacturing | 1973 |
| Suffolk Woodchips Ltd | Manufacturing | 1996 |
| Suffolk Woodland Weddings Ltd | Other services | 2024 |
| Suffolkspace Ltd | Manufacturing | 2018 |
| Sugar Studios London Ltd | Information & communication | 2024 |
| Sugarnsmiles Ltd | Hospitality | 2026 |
| Sugartown Toys Ltd | Wholesale & retail | 2024 |
| Suite Bathrooms Limited | Construction | 2025 |
| Suitecasa Properties Ltd | Real estate | 2023 |
| Suitedreams Investments Ltd | Real estate | 2023 |
| Sulei Ltd | Information & communication | 2023 |
| Sully's Games Ltd | Arts & recreation | 2024 |
| Sullyscardtcg Ltd | Wholesale & retail | 2023 |
| Sultan Enterprises Inc Limited | Wholesale & retail | 2024 |
| Sumaira Optical Limited | Wholesale & retail | 2022 |
| Summer Mint Ltd | Information & communication | 2025 |
| Summers Windows&Doors Ltd | Construction | 2025 |
| Summershow Limited | Wholesale & retail | 2025 |
| Summit Engage Limited | Professional & scientific | 2024 |
| Summit Select Group International Ltd | Wholesale & retail | 2026 |
| Summoning Ghosts Ltd | Information & communication | 2026 |
| Sun Smart UK Limited | Construction | 2022 |
| Sunaina Textile Ltd | Wholesale & retail | 2026 |
| Sunderland Electrical Ltd | Professional & scientific | 2023 |
| Sunderland Wills & Trusts Ltd | Professional & scientific | 2017 |
| Sunflower Property Mgmt Ltd | Real estate | 2023 |
| Sunflower Wellness CIC | Health & social care | 2026 |
| Sunil Jain Limited | Administrative & support | 2007 |
| Sunilkalbandi Ltd | Professional & scientific | 2024 |
| Sunkenduck Limited | Real estate | 2021 |
| Sunnahbeads Ltd | Wholesale & retail | 2024 |
| Sunny Nails Ltd | Other services | 2026 |
| Sunnyray Cleaning Ltd | Administrative & support | 2025 |
| Sunray Delivery Ltd | Transport & logistics | 2024 |
| Sunrise Direct Limited | Wholesale & retail | 1998 |
| Sunrise Fruits & Vegetables Ltd | Wholesale & retail | 2025 |
| Sunrise Global Trading Ltd | Wholesale & retail | 2023 |
| Sunrise Produce Ltd | Manufacturing | 2009 |
| Sunrise Produce Trading Ltd | Manufacturing | 2025 |
| Supasprinkles Ltd | Information & communication | 2026 |
| Super Achiever Ltd | Administrative & support | 2023 |
| Super Braai Ltd | Other services | 2018 |
| Super Sentimental Ltd | Professional & scientific | 2023 |
| Super Spice Group Limited | Wholesale & retail | 2023 |
| Superfine Projects Ltd | Professional & scientific | 2025 |
| Superior Health Solutions Ltd | Health & social care | 2024 |
| Superwrapped Ltd | Information & communication | 2026 |
| Supplements 4 YOU Ltd | Wholesale & retail | 2025 |
| Supply Chain Solutions Group Limited | Financial services | 2022 |
| Supplychainwise Limited | Information & communication | 2023 |
| Support for Your Business Ltd | Professional & scientific | 2014 |
| Supporting Tech Advancement and Community Knowledge (Stack) CIC | Information & communication | 2026 |
| Sure Compass Limited | Professional & scientific | 2024 |
| Suresite Ltd | Real estate | 2022 |
| Surface Coatings Services Limited | Professional & scientific | 2017 |
| Surfing the Sea of Life Ltd | Extraterritorial | 2025 |
| Surftech Surfaces Limited | Construction | 2013 |
| Survd Group Ltd | Information & communication | 2025 |
| Survey Sync Ltd | Professional & scientific | 2026 |
| Survive the Day CIC | Other services | 2025 |
| Survyo Ltd | Information & communication | 2025 |