| Student Biscuits Ltd | Extraterritorial | 2013 |
| Student Links Overseas Education and Legal Consultants Limited | Professional & scientific | 2021 |
| Student Search Limited | Education | 2021 |
| Students Careline Limited | Education | 2025 |
| Students Help Desk Ltd | Professional & scientific | 2024 |
| Studio 120 Limited | Other services | 2020 |
| Studio Asterix Ltd | Professional & scientific | 2022 |
| Studio E Architects Limited | Professional & scientific | 1994 |
| Studio Elevation Ltd | Professional & scientific | 2025 |
| Studio MAG Limited | Other services | 2009 |
| Studio Primary Ltd | Information & communication | 2023 |
| Studio Summit Ltd | Professional & scientific | 2025 |
| Studio Uddin Ltd | Professional & scientific | 2026 |
| Studiomarmi Ltd | Administrative & support | 2025 |
| Study and UK Ltd | Education | 2022 |
| Study Forge Ltd | Information & communication | 2026 |
| Study Nest Ltd | Education | 2021 |
| Study Republic Ltd | Education | 2025 |
| Study Spark Advisors Ltd | Education | 2024 |
| Studylinks Limited | Information & communication | 2007 |
| Studysmart Learning Ltd | Education | 2025 |
| Stuff Over Frames Limited | Manufacturing | 2018 |
| Stuffzilla Ltd | Extraterritorial | 2015 |
| Stuggi Ltd | Hospitality | 2019 |
| Stuning Traders Ltd | Wholesale & retail | 2025 |
| Sturdy Building Services Ltd | Construction | 2024 |
| Sturgeon Ltd | Manufacturing | 2022 |
| Sturling Limited | Professional & scientific | 2016 |
| Sturry Street Ltd | Real estate | 2022 |
| Stuttgart Legends Limited | Wholesale & retail | 2021 |
| STX Services Ltd | Construction | 2025 |
| Style in Care Limited | Other services | 2011 |
| Style Nails Ltd | Other services | 2025 |
| Styleinc Ltd | Wholesale & retail | 2025 |
| Styles by Reen Ltd | Other services | 2022 |
| Styleware Limited | Wholesale & retail | 2019 |
| Stylo Communication Limited | Other services | 2007 |
| Stylo Mobiles London Ltd | Other services | 2020 |
| Stylofax Limited | Manufacturing | 2016 |
| Stylophones Ltd | Other services | 2024 |
| SU Property Services Ltd | Real estate | 2023 |
| Suave Cars Limited | Administrative & support | 2022 |
| Suave Collective Limited | Wholesale & retail | 2025 |
| Suaz Investments Ltd | Real estate | 2023 |
| Suaz Limited | Professional & scientific | 2026 |
| SUB Rang London Ltd | Wholesale & retail | 2014 |
| Suba Building Services Ltd | Construction | 2023 |
| Subatomic Analytics Limited | Professional & scientific | 2019 |
| Subcontractor Services Limited | Transport & logistics | 2015 |
| Subex Ltd | Wholesale & retail | 2014 |
| Subhaan Caterers Ltd | Hospitality | 2021 |
| Subhansaim Ltd | Hospitality | 2026 |
| Subhantel Limited | Wholesale & retail | 2011 |
| Subharesh Ltd | Other services | 2019 |
| Sublab Records Ltd | Manufacturing | 2021 |
| Sublime Cars Limited | Wholesale & retail | 2017 |
| Sublime Gifts Limited | Wholesale & retail | 2022 |
| Sublime Tech Solutions Limited | Information & communication | 2018 |
| Submarine Sandwiches (Corby) Limited | Hospitality | 2005 |
| Submission School Project C.I.C. | Arts & recreation | 2015 |
| Subra Logistics Limited | Transport & logistics | 2023 |
| Subzen Limited | Information & communication | 2008 |
| Succes Transport Ltd | Transport & logistics | 2025 |
| Success Fairy Worldwide Ltd | Wholesale & retail | 2024 |
| Success Medic Ltd | Health & social care | 2012 |
| Success Pulse Limited | Information & communication | 2025 |
| SUCCESS4U Ltd | Transport & logistics | 2020 |
| Sudan Construction Ltd | Construction | 2025 |
| Sudan Enterprises Ltd | Wholesale & retail | 2026 |
| Sudesh Ltd | Administrative & support | 2023 |
| Sudha Engineering Limited | Construction | 2015 |
| Sudharsan Technologies Ltd | Wholesale & retail | 2025 |
| Sudra Advisors Limited | Extraterritorial | 2019 |
| Suffolk Farms Ltd | Wholesale & retail | 2012 |
| Sufiyana Nights Limited | Arts & recreation | 2025 |
| Sufo Cleaning Ltd | Administrative & support | 2026 |
| Suftnet Limited | Information & communication | 2011 |
| Sufyan RK Limited | Wholesale & retail | 2024 |
| Sugar Clothing Limited | Wholesale & retail | 2005 |
| Sugar Hill Estates Limited | Real estate | 2022 |
| Sugar HUT Group Ltd | Hospitality | 2025 |
| Sugar Spoon Ltd | Hospitality | 2025 |
| Sugardnsweet Ltd | Wholesale & retail | 2023 |
| Sugiarto Services LLP | | 2019 |
| Suguna Ltd | Wholesale & retail | 2026 |
| Suhan Transport Ltd | Transport & logistics | 2020 |
| SUI Generis Apparel Ltd | Wholesale & retail | 2026 |
| Sujaro Ltd | Real estate | 2021 |
| Sujata's Ltd | Hospitality | 2023 |
| Sujathaa Impex Ltd | Wholesale & retail | 2023 |
| Sukh Property Management Ltd | Households | 2024 |
| Sukha Building Contractor Ltd | Construction | 2023 |
| Sukhchain Homes Ltd | Real estate | 2021 |
| Sukhchain Singh Ltd | Construction | 2024 |
| Sukhdav Staircase Ltd | Construction | 2015 |
| Sukhdeep Singhh Ltd | Construction | 2025 |
| Sukhi A1 Limited | Construction | 2011 |
| Sukhi Staircase Ltd | Construction | 2020 |
| Sukrew Limited | Wholesale & retail | 2013 |
| Sukumaran Limited | Real estate | 2025 |