| SJK Commercial Services Limited | Administrative & support | 2014 |
| SJK Electrical Services Limited | Construction | 2007 |
| SJL Recruitment Holdings Limited | Administrative & support | 2022 |
| SJL Recruitment Limited | Administrative & support | 2012 |
| SJM London Limited | Real estate | 2005 |
| Sjmeehan Ltd | Construction | 2021 |
| SJP Catering Limited | Hospitality | 2024 |
| SJP Financial Strategies Limited | Financial services | 2012 |
| SJP Property Consulting Ltd | Real estate | 2025 |
| SJT Property Services Limited | Real estate | 2015 |
| SK & MS IT Consulting Limited | Information & communication | 2026 |
| SK Agro Trade Ltd | Wholesale & retail | 2025 |
| Skanwear Clothing Company Ltd | Wholesale & retail | 2010 |
| Skanwear Group Holdings Ltd | Financial services | 2015 |
| Skelcroft Electrics Limited | Construction | 2019 |
| Skellow & Mini Market Limited | Wholesale & retail | 2025 |
| Skellow Club Limited | Hospitality | 2022 |
| Skellow Fried Chicken Ltd | Hospitality | 2020 |
| Skellow Mini Market Ltd | Wholesale & retail | 2024 |
| Skellow Road Fish Bar Ltd | Hospitality | 2025 |
| Skellow Road Pet Supplies Ltd | Wholesale & retail | 2025 |
| SKG 2025 Limited | Financial services | 2025 |
| SKH Fuel Ltd | Wholesale & retail | 2019 |
| Skidmore Electrical (UK) Ltd | Construction | 2014 |
| Skiin Sisters Ltd | Other services | 2022 |
| Skill Step Group Ltd | Professional & scientific | 2019 |
| Skill-Fit Limited | Education | 2023 |
| Skills Active Services Ltd | Administrative & support | 2004 |
| Skills Active UK. | Administrative & support | 2003 |
| Skills Doncaster Ltd | Education | 2019 |
| Skills Support Limited | Health & social care | 2014 |
| Skin Deep Beauty Training Limited | Education | 2021 |
| Skin Medicine Ltd | Health & social care | 2022 |
| Skin Organics Ltd | Other services | 2016 |
| Skin Techniques Limited | Other services | 2007 |
| Skin Therapy by Alexandra Ltd | Health & social care | 2024 |
| Skincs Logistics Ltd | Transport & logistics | 2025 |
| Skinner Street Properties Ltd | Other services | 2016 |
| SKINNER21 Ltd | Professional & scientific | 2019 |
| Skinny FIX Ltd | Wholesale & retail | 2021 |
| Skinovita Luxury Skincare Limited | Wholesale & retail | 2025 |
| SKIP2IT Doncaster Limited | Water & waste | 2010 |
| Skipton Hotel Ltd | Hospitality | 2024 |
| SKJ Ecommerce Ltd | Wholesale & retail | 2025 |
| SKK Property Ltd | Real estate | 2024 |
| Sklep Tradycja Limited | Wholesale & retail | 2018 |
| Skoolie BUS Bar Ltd | Hospitality | 2026 |
| SKS Prime Properties Ltd | Real estate | 2025 |
| Sky High Tree & Ground Maintenance Services Limited | Other services | 2020 |
| Sky Roofing Systems Ltd | Construction | 2026 |
| Skyblu Limited | Other services | 2003 |
| Skycube Games Ltd | Information & communication | 2024 |
| Skydive Crazy Limited | Arts & recreation | 2018 |
| Skylands Holdings Ltd | Financial services | 2023 |
| Skylarhansen Limited | Information & communication | 2016 |
| Skylex Solutions Limited | Other services | 2019 |
| Skyline Business Ltd | Administrative & support | 2025 |
| Skyline Engineering Consultancy Ltd | Extraterritorial | 2015 |
| Skyline Reach Ltd | Extraterritorial | 2026 |
| Skylinelabs Technologies Limited | Information & communication | 2025 |
| Skyronin Media Ltd | Professional & scientific | 2023 |
| SL Beauty Academy Limited | Other services | 2018 |
| SL Delivery Limited | Transport & logistics | 2018 |
| SL Electrical Services Ltd | Energy | 2016 |
| SL Guitar Works Ltd | Manufacturing | 2026 |
| SL Retail Arbitrage Ltd | Wholesale & retail | 2025 |
| Slarix Property Development Ltd | Extraterritorial | 2023 |
| Slated Beauty Ltd | Other services | 2019 |
| Slatepick Ltd | Information & communication | 2025 |
| Slater Building Solutions Limited | Construction | 2014 |
| Slater Investment Properties Limited | Real estate | 2025 |
| Slatevale Limited | Wholesale & retail | 1985 |
| Slavita Ltd | Wholesale & retail | 2019 |
| Slegers Investment Group Ltd | Financial services | 2020 |
| Slim Academy Ltd | Education | 2026 |
| Slimezyclo Ltd | Wholesale & retail | 2025 |
| Slingsby Electrics Limited | Construction | 2007 |
| Slipstream Traffic Ltd | Construction | 2024 |
| SLJ Properties Ltd | Real estate | 1998 |
| SLM Healthcare Services Limited | Health & social care | 2012 |
| SLN Tailoring Sewing and Fashion House Ltd | Manufacturing | 2020 |
| Slot & ZO Lock Compagnie Ltd | Other services | 2024 |
| Slot-Aaa Limited | Manufacturing | 2022 |
| SLR Trans Limited | Transport & logistics | 2020 |
| Slrc Ltd | Real estate | 2020 |
| SLS Global Property Ltd | Real estate | 2024 |
| SLS Line & Surface Ltd | Construction | 2026 |
| SLS Tunnelling Group Ltd | Financial services | 2024 |
| SLT Holdings (UK) Limited | Financial services | 2020 |
| SLT Property Investments Ltd | Real estate | 2020 |
| Sltk Services Ltd | Extraterritorial | 2025 |
| Slusmount Ltd | Wholesale & retail | 2023 |
| SLW Farming and Contracting Services Ltd | Agriculture & fishing | 2023 |
| SM Aspire Ltd | Health & social care | 2019 |
| SM Classic Car Welding Services Ltd | Wholesale & retail | 2019 |
| SM Security Limited | Administrative & support | 2024 |
| SM Wellbeing Ltd | Professional & scientific | 2026 |
| Sm&R Products Ltd | Wholesale & retail | 2026 |
| SM4U Ltd | Construction | 2016 |
| SMA Trans Ltd | Transport & logistics | 2022 |