| Sustaina Collective Ltd | Wholesale & retail | 2025 |
| Sustainable Research & Innovation Outreach Limited | Wholesale & retail | 2024 |
| Sustainable Solutions Construction Ltd | Construction | 2018 |
| Sustineo Limited | Professional & scientific | 2012 |
| Sutha Traffic Management Ltd | Construction | 2024 |
| Sutton Construction (MK) Limited | Extraterritorial | 2011 |
| Sutton Contract Management Limited | Real estate | 2007 |
| Sutton Propco Limited | Real estate | 2025 |
| Suubi Properties Limited | Real estate | 2025 |
| Suvona Ltd | Real estate | 2021 |
| Suzanne Mackenzie Ltd | Wholesale & retail | 2025 |
| Suzuki GB PLC | Wholesale & retail | 1963 |
| SVC Legacy Estates Ltd | Real estate | 2026 |
| Sved Solutions Limited | Professional & scientific | 2023 |
| Svgc Associates Limited | Professional & scientific | 2021 |
| Svgc Digital Limited | Information & communication | 2021 |
| Svgc Group Limited | Professional & scientific | 2021 |
| Svgc Limited | Professional & scientific | 1997 |
| SVJ Construction Ltd | Construction | 2026 |
| SVK Consultancy Services Limited | Information & communication | 2016 |
| SVM IT Services Limited | Information & communication | 2025 |
| SVN Homes Limited | Real estate | 2021 |
| SVR Aesthetics Limited | Health & social care | 2018 |
| SVR Commercial Estates Ltd | Real estate | 2026 |
| SVR Property Services Limited | Real estate | 2023 |
| SVR Wellness Clinic Ltd | Health & social care | 2025 |
| SVS Infotech Limited | Information & communication | 2015 |
| SVS Plant Ltd | Construction | 2018 |
| SVV Building Ltd | Construction | 2025 |
| SW Consulting Group Ltd | Information & communication | 2024 |
| SW Fast Transport Ltd | Transport & logistics | 2023 |
| SW Hearing Health LLP | | 2020 |
| SW Planning Consultancy Limited | Professional & scientific | 2014 |
| Sw-Artha Limited | Information & communication | 2013 |
| SW11SOLUTIONS Limited | Professional & scientific | 2018 |
| Swad Caterers Ltd | Wholesale & retail | 2023 |
| Swagat DRY Cleaning Ltd | Other services | 2025 |
| Swagat Styles Ltd | Wholesale & retail | 2025 |
| Swagatinvestments Ltd | Real estate | 2022 |
| Swain Accountancy Ltd | Professional & scientific | 2018 |
| Swala Aerospace Ltd | Transport & logistics | 2017 |
| Swalcliffe Stud LLP | | 2024 |
| Swan & Key Ltd | Real estate | 2025 |
| Swan Capital Property Group Ltd | Real estate | 2026 |
| Swan Cottage Wroxham Ltd | Hospitality | 2023 |
| Swanbourne Company NO. 1 Limited | Professional & scientific | 2011 |
| Swanbourne Company NO. 2 Limited | Professional & scientific | 2011 |
| Swanbourne Property Ltd | Real estate | 2017 |
| Swanells & Grylls Limited | Manufacturing | 1978 |
| Swanepoel Design Limited | Professional & scientific | 1997 |
| Swanepoel Limited | Construction | 2013 |
| Swann Communications (Europe) Limited | Wholesale & retail | 2008 |
| Swatara Ltd | Information & communication | 2026 |
| SWC Homes Ltd. | Real estate | 2017 |
| SWE & ZIN Ltd | Health & social care | 2025 |
| Sweans Technologies Ltd | Information & communication | 2014 |
| Sweatband.Com Limited | Wholesale & retail | 1995 |
| Sweenco Limited | Other services | 2018 |
| Sweep Pro Limited | Other services | 2015 |
| Sweet "N" Seasoned Ltd. | Wholesale & retail | 2013 |
| Sweet and Savoury Ltd | Hospitality | 2025 |
| Sweet Autumn Limited | Wholesale & retail | 2019 |
| Sweet Inn (UK) Ltd | Hospitality | 2017 |
| Sweet Ninja Foods Limited | Manufacturing | 2019 |
| Sweet One Beauty Bar Ltd | Other services | 2020 |
| Sweet Selections MK Ltd | Wholesale & retail | 2025 |
| Sweet Spot Lifestyle Ltd | Information & communication | 2024 |
| Sweetman Consulting Ltd | Professional & scientific | 2012 |
| Sweetsmiles.Care Limited | Public administration | 2026 |
| Sweira Solutions Limited | Information & communication | 2023 |
| Swellcoach Ltd | Professional & scientific | 2016 |
| Swex Cargos Worldwide Ltd | Transport & logistics | 2018 |
| Swey Aesthetics Limited | Other services | 2025 |
| SWF Professional Services Limited | Professional & scientific | 2023 |
| SWF Solicitors Ltd | Professional & scientific | 2021 |
| Swift Auto Sales Ltd | Wholesale & retail | 2023 |
| Swift Carbon UK Limited | Wholesale & retail | 2020 |
| Swift Care First Ltd | Administrative & support | 2020 |
| Swift Customs Ltd | Arts & recreation | 2013 |
| Swift Drive Limited | Education | 2016 |
| Swift Event Management & Timing Services Ltd | Arts & recreation | 2023 |
| Swift IT Computer Services Ltd | Information & communication | 2009 |
| Swift Merchants Ltd | Wholesale & retail | 2026 |
| Swiftcare UK Limited | Transport & logistics | 1995 |
| Swiftnet Solutions Limited | Information & communication | 2010 |
| Swiftpower Maintenance Ltd | Construction | 2021 |
| Swimlane Business Consulting Limited | Information & communication | 2014 |
| Swingbest Limited | Information & communication | 1994 |
| Swish Locks Luxury Hair Extensions Ltd | Wholesale & retail | 2025 |
| Swiss Carbide & Tools Ltd | Wholesale & retail | 2023 |
| Swiss Sparrow Ltd | Wholesale & retail | 2025 |
| SWISSPARTS4U Ltd | Manufacturing | 2024 |
| Switch Education Ltd | Education | 2016 |
| Switzer Trading and Engineering Ltd | Wholesale & retail | 2025 |
| Swoop Finance Limited | Financial services | 2018 |
| Sword Plumbing and Heating Ltd | Construction | 2024 |
| Swrd Ltd | Water & waste | 2014 |
| Swtb Limited | Professional & scientific | 2023 |
| Sybi Trans Ltd | Transport & logistics | 2020 |
| Sycap IT Ltd | Information & communication | 2021 |