| Super Dong Fang Limited | Hospitality | 2025 |
| Super Spice Ltd | Hospitality | 2025 |
| Super Trowel (UK) Ltd | Administrative & support | 2023 |
| Superhero Series C.I.C. | Other services | 2016 |
| Superior FRY Ltd | Manufacturing | 2021 |
| Superior Lofts and Renovations Limited | Construction | 2024 |
| Superstars International Ltd | Manufacturing | 2021 |
| Supo Holdings Limited | Financial services | 2024 |
| Supper Spice Ltd | Hospitality | 2016 |
| Supplement Packaging Ltd | Wholesale & retail | 2026 |
| Supply Value Management Limited | Professional & scientific | 2008 |
| Support Service Leaders Limited | Administrative & support | 2017 |
| Supreme Clean Limited | Professional & scientific | 2001 |
| Supreme Logistics Shipping Services UK Ltd | Wholesale & retail | 2019 |
| Suprima Service Ltd | Wholesale & retail | 2015 |
| Suraksha Properties Ltd | Real estate | 2022 |
| Suraksha Technologies Limited | Information & communication | 2021 |
| Sure Foundation Ministries: House of Prayer | Other services | 2007 |
| Surecoat Ltd | Construction | 2019 |
| Surefix Plumbing and Heating Ltd. | Construction | 1997 |
| Surehaven Properties Ltd | Real estate | 2024 |
| Surehold Limited | Real estate | 2007 |
| Surelight Group Ltd | Construction | 2025 |
| Suresurvey Limited | Information & communication | 2025 |
| Surface Improvement Services Limited | Manufacturing | 2024 |
| Surgensee Limited | Information & communication | 2003 |
| Surma Curry House Limited | Hospitality | 2020 |
| Surrells Carpentry & Joinery Ltd | Administrative & support | 2015 |
| Surrey Court Limited | Households | 2007 |
| Survey Safe Limited | Water & waste | 2011 |
| Sushi Roll Station Limited | Hospitality | 2025 |
| Sustainability Counts Ltd | Professional & scientific | 2023 |
| Sustainable Source Group Limited | Information & communication | 2024 |
| Sustenta C.I.C. | Manufacturing | 2024 |
| Sutly Property Ltd | Real estate | 2019 |
| Suveren Ltd | Health & social care | 2015 |
| Suzie Care Limited | Health & social care | 2018 |
| Svago Ltd | Professional & scientific | 2024 |
| SVB Holdings Limited | Financial services | 2016 |
| SVC Holdings Ltd | Financial services | 2017 |
| SVC Safety Solutions LLP | | 2018 |
| SVC Solutions Ltd | Professional & scientific | 2020 |
| SVC Technical Ltd | Administrative & support | 2011 |
| SVC Training Ltd | Administrative & support | 2017 |
| Svcp Ltd | Administrative & support | 2019 |
| Svcp Properties Ltd | Real estate | 2019 |
| SVD (UK) Ltd | Extraterritorial | 2014 |
| Svetlina Ltd | Other services | 2025 |
| SVT Trading Limited | Hospitality | 2024 |
| SW11 DJ Ltd | Arts & recreation | 2024 |
| Swale Properties (Kent) Limited | Real estate | 1987 |
| Swallow Fields Residents Association Ltd | Households | 2025 |
| Swallowdale Management Company Limited | Households | 1986 |
| Swan Aerospace Consulting Ltd | Professional & scientific | 2020 |
| Swan Shutters Limited | Wholesale & retail | 2022 |
| Sway Consulting Limited | Information & communication | 2024 |
| SWB UK Limited | Health & social care | 2009 |
| Swecos Diamond Drilling Limited | Construction | 2023 |
| Swecos Group Limited | Financial services | 2023 |
| Swecos Skips Limited | Professional & scientific | 2022 |
| Swecos Structural Alterations Limited | Construction | 2020 |
| Swedish Meatball Factory Ltd | Wholesale & retail | 2023 |
| Sweeden Sugar RAY International Limited | Real estate | 2003 |
| Sweeny Wealth Management Ltd | Administrative & support | 2016 |
| Sweet Dreams Direct Ltd | Wholesale & retail | 2020 |
| Sweet Home Property Letting Company Limited | Real estate | 2021 |
| Sweet N Green Limited | Hospitality | 2025 |
| Sweetland 23 Limited | Wholesale & retail | 2025 |
| Sweetpea Grow and Play CIC | Agriculture & fishing | 2026 |
| Sweetyetty Ltd | Health & social care | 2022 |
| Swellin Ltd | Professional & scientific | 2023 |
| SWF Projects Ltd | Professional & scientific | 2026 |
| Swift & Tern Ltd | Professional & scientific | 2024 |
| Swift Care Solutions Ltd | Administrative & support | 2017 |
| Swift Investment Properties Limited | Financial services | 2019 |
| Swift Ride Cabs Limited | Transport & logistics | 2026 |
| Swift Roman Limited | Transport & logistics | 2021 |
| Swift Scaffolding Holdco Limited | Financial services | 2024 |
| Swift Scaffolding Limited | Construction | 1995 |
| Swift Transport Ltd | Transport & logistics | 2019 |
| Swiftprintuk Ltd | Manufacturing | 2013 |
| Swiftvize Ltd | Wholesale & retail | 2025 |
| Swilsy & SON Ltd | Financial services | 2021 |
| Swim-With-Me Ltd | Arts & recreation | 2011 |
| SWIM2SWIM Limited | Arts & recreation | 2009 |
| Swindon Tuition Centre Ltd | Education | 2014 |
| Swinging Shovels Ltd | Professional & scientific | 2025 |
| Switches Ltd | Wholesale & retail | 2025 |
| Swithenbank Psychology Limited | Education | 2020 |
| Swot Services Ltd | Health & social care | 2023 |
| SX Consultancy Limited | Information & communication | 1994 |
| SX GRP Ltd | Water & waste | 2026 |
| SX Holdings Limited | Extraterritorial | 1996 |
| Sycamore Grove (Bishops Stortford) Management Company Limited | Households | 2026 |
| Sycamore Place (2002) Limited | Real estate | 2002 |
| Sycamore Place (Ipswich) Management Company Limited | Real estate | 1986 |
| Sycamore Property and Developments Ltd | Construction | 2024 |
| Syeda Sabrina Limited | Wholesale & retail | 2025 |
| Symbiotic Data Consultancy Limited | Information & communication | 2014 |
| Symden Ltd | Wholesale & retail | 2024 |