| SM Trans Logistics Ltd | Transport & logistics | 2019 |
| SM20 Ltd | Financial services | 2023 |
| SM4 Associates Ltd | Professional & scientific | 2005 |
| Smacks Hamburgers Franchise Ltd | Wholesale & retail | 2019 |
| Small Business Accountancy Services Ltd | Professional & scientific | 2016 |
| Small Explorers Limited | Education | 2016 |
| Small Wheels Repairs Ltd | Wholesale & retail | 2025 |
| Smart 2 Recycle Ltd | Water & waste | 2017 |
| Smart Auto Point Ltd | Wholesale & retail | 2025 |
| Smart Barks Doggy Day Care Limited | Wholesale & retail | 2019 |
| Smart Build Properties Limited | Construction | 2013 |
| Smart Buy Market Ltd | Wholesale & retail | 2026 |
| Smart Fuel Pass U.K. Ltd | Administrative & support | 2024 |
| Smart Futures Education Limited | Education | 2018 |
| Smart Heat South Ltd | Construction | 2023 |
| Smart Home Heat Limited | Wholesale & retail | 2015 |
| Smart House Developers Ltd | Construction | 2016 |
| Smart Innovators Europe Ltd | Wholesale & retail | 2015 |
| Smart Investors Financial Services & Investments Limited | Financial services | 2021 |
| Smart KOF Ltd | Other services | 2025 |
| Smart Landscaping-Uk Ltd | Administrative & support | 2021 |
| Smart Living Holdings Ltd | Real estate | 2022 |
| Smart Living Wholesale Ltd | Wholesale & retail | 2012 |
| Smart Movements Ltd | Administrative & support | 2024 |
| Smart Phone Hub Ltd | Wholesale & retail | 2025 |
| Smart Pillar Properties Ltd | Construction | 2026 |
| Smart Procurement Limited | Professional & scientific | 2018 |
| Smart Shared Services Limited | Professional & scientific | 2025 |
| Smart Space Property Solutions Limited | Real estate | 2012 |
| Smart Sport Coaching Limited | Education | 2023 |
| Smart Sport Foundation Ltd | Education | 2022 |
| Smart Vehicle Management Ltd | Administrative & support | 2017 |
| Smart Way Solutions Ltd | Construction | 2020 |
| Smart-Z London Ltd | Construction | 2019 |
| Smarta Enterprises Limited | Administrative & support | 2008 |
| Smartcleaningservicesuk Ltd | Administrative & support | 2024 |
| Smartconnect Ltd | Information & communication | 2025 |
| Smarter Moves Limited | Wholesale & retail | 2023 |
| Smartroof Construction Ltd | Construction | 2020 |
| Smartspace Group Limited | Households | 2024 |
| Smartwash Cleaning Services Limited | Administrative & support | 2025 |
| Smartwork Ventures Limited | Wholesale & retail | 2025 |
| Smat-Ease Accounting Ltd | Professional & scientific | 2023 |
| SMB Global Ltd | Wholesale & retail | 2026 |
| SMB Studios Ltd | Professional & scientific | 2019 |
| Smbs (UK) Limited | Wholesale & retail | 2002 |
| SME Business Network Ltd | Other services | 2019 |
| SME Local CIC | Professional & scientific | 2023 |
| Smigol Painting Ltd | Construction | 2016 |
| Smile Compare Ltd | Information & communication | 2026 |
| Smile WE Care Ltd | Health & social care | 2020 |
| Smith & SON Enterprises Limited | Hospitality | 2013 |
| Smith Partners Ltd | Wholesale & retail | 2022 |
| Smithereens Limited | Wholesale & retail | 2023 |
| Smithy's Mews Freeholders Ltd | Households | 2023 |
| SMJ Beauty Ltd | Wholesale & retail | 2026 |
| SMK Properties Limited | Real estate | 2002 |
| Smkk Limited | Wholesale & retail | 2025 |
| SML UK Limited | Information & communication | 1999 |
| SML UK Solutions Ltd | Construction | 2012 |
| Smnisbv Fertilizer Co., Ltd | Administrative & support | 2021 |
| Smoojies Original Limited | Wholesale & retail | 2014 |
| Smooth Apparel Limited | Wholesale & retail | 2025 |
| Smooth&Rhythmdancestyles UK Ltd | Education | 2025 |
| Smorgan Properties Ltd | Real estate | 2022 |
| Smryan Energy Markets Consulting Limited | Professional & scientific | 2009 |
| Smvh Limited | Hospitality | 2018 |
| Smvh Properties Limited | Financial services | 2024 |
| SN Combat Academy Ltd | Real estate | 2002 |
| SN Convenience Store Limited | Wholesale & retail | 2024 |
| SNA Supermarket Ltd | Wholesale & retail | 2006 |
| Snap Knowledge Limited | Administrative & support | 2017 |
| Snappi Limited | Administrative & support | 2018 |
| Snapshot Booths Ltd | Other services | 2021 |
| Sneakerpluguk Limited | Wholesale & retail | 2019 |
| Snkr Exchange Ltd | Wholesale & retail | 2021 |
| SNM London Hair Studio Ltd | Other services | 2020 |
| Snodland Sports Ground Residents Management Company Limited | Households | 2008 |
| Snow Lawfield & Co Limited | Professional & scientific | 2006 |
| Snow Nails and Beauty Ltd | Other services | 2026 |
| Snowdenham Hall Freehold Limited | Households | 2000 |
| Snowdenham Hall Management Limited | Households | 2025 |
| Snowsfields Yard Management Company Limited | Extraterritorial | 2015 |
| Snowwhite Enterprises Limited | Construction | 2020 |
| SNP Services Ltd | Construction | 2025 |
| SNS Barber Ltd | Other services | 2026 |
| Snuggles Pre-School Limited | Education | 2013 |
| Snugland Limited | Wholesale & retail | 2018 |
| Snva Travel Tech UK Limited | Administrative & support | 2020 |
| SO Good Investments Ltd | Hospitality | 2020 |
| SO Good Soap Ltd | Wholesale & retail | 2019 |
| Sociables Express Ltd | Professional & scientific | 2022 |
| Social Click Ltd | Professional & scientific | 2024 |
| Social Herbalists Ltd | Manufacturing | 2026 |
| Social Solutions Inst. of Research & Development Limited | Administrative & support | 2004 |
| Social Starters Ltd | Professional & scientific | 2014 |
| Socinova Ltd | Administrative & support | 2025 |
| Sock and Buskin Marketing and PR Ltd | Professional & scientific | 2023 |
| Sofas and Friends Limited | Wholesale & retail | 2019 |
| Sofia Dewji Ltd | Administrative & support | 2008 |