| Smith & Mann Ltd | Wholesale & retail | 2008 |
| SMK Law Solicitors LLP | | 2016 |
| SMK Property Management Services Ltd | Real estate | 2025 |
| SMN Properties Ltd | Real estate | 2020 |
| SMN Recruitment Ltd | Construction | 2025 |
| SMN Services Limited | Construction | 2019 |
| SMP Network Ltd | Information & communication | 2015 |
| SMQ Trading Ltd | Wholesale & retail | 2019 |
| SMR Estates Ltd. | Real estate | 2002 |
| Smutek Construction Ltd | Construction | 2015 |
| SMW Accounting Services Ltd | Professional & scientific | 2025 |
| SMW Bookkeeping Services Ltd | Professional & scientific | 2012 |
| SMW General Services Ltd | Administrative & support | 2016 |
| SMW Group (London) Limited | Administrative & support | 2019 |
| SMW Investments Ltd | Professional & scientific | 2019 |
| Smxdc Ltd | Education | 2024 |
| SN Flooring Ltd | Construction | 2025 |
| SN Infotech Ltd | Information & communication | 2018 |
| SN Plus Holdings Ltd | Financial services | 2026 |
| SN Plus Ltd | Financial services | 2025 |
| SN Pro Services Limited | Wholesale & retail | 2022 |
| SN Proprietors Limited | Real estate | 2024 |
| SNA Technologies Limited | Information & communication | 2019 |
| SNA Transfers Limited | Transport & logistics | 2026 |
| Snack Drawer Ltd | Wholesale & retail | 2021 |
| Snack Thrills Ltd | Manufacturing | 2020 |
| Snacks Inc Distro Ltd | Wholesale & retail | 2025 |
| Snaj Limited | Information & communication | 2022 |
| Snap&Shop Limited | Wholesale & retail | 2025 |
| Snapperazzi Ltd | Information & communication | 2022 |
| Snapturebymz Ltd | Professional & scientific | 2024 |
| SND Business Solutions Ltd | Information & communication | 2026 |
| SNG Properties Limited | Real estate | 2014 |
| SNL Properties Ltd | Real estate | 2020 |
| Snovasys Software Solutions Limited | Information & communication | 2008 |
| SNS Estate Investments Ltd | Real estate | 2026 |
| SNS Global Limited | Real estate | 2022 |
| SNS Janjua Ltd | Transport & logistics | 2025 |
| SNS Portfolio Ltd | Real estate | 2017 |
| Soan Services Limited | Wholesale & retail | 2025 |
| Sobae Cosmetics Ltd | Wholesale & retail | 2024 |
| Sobti Property Management Ltd | Real estate | 2015 |
| Soccer Champs Football Academy Limited | Arts & recreation | 2025 |
| Social Awaken Ltd | Professional & scientific | 2018 |
| Social Care Aspirations Ltd | Health & social care | 2010 |
| Social Harmony and Development Organisation Limited | Health & social care | 2012 |
| Sofeon Technologies Ltd | Information & communication | 2025 |
| Sofin Care Limited | Health & social care | 2013 |
| Soft Touch Wholesalers Limited | Wholesale & retail | 2010 |
| Softmate Limited | Information & communication | 2022 |
| Softplex Limited | Information & communication | 2017 |
| Sofvtec Ltd | Information & communication | 2025 |
| Sohail N Group of Enterprises Ltd | Wholesale & retail | 2024 |
| Sohal Consultancy Ltd | Real estate | 2025 |
| Sohi Logistics Limited | Transport & logistics | 2018 |
| Soil Land Construction Ltd | Construction | 2026 |
| Sokal Family LLP | | 2019 |
| Sokhal Construction Ltd | Construction | 2019 |
| Sokhi Builders Limited | Construction | 2025 |
| Sokhi Property Investments Limited | Real estate | 2024 |
| Sokol 4TRANS Ltd | Transport & logistics | 2012 |
| Soletest Limited | Information & communication | 2012 |
| Solid Construction Services Ltd | Construction | 2026 |
| Solid Waste Group Ltd | Water & waste | 2026 |
| Solight Limited | Real estate | 2000 |
| Solintek Ltd | Information & communication | 2024 |
| Sollis Ltd | Construction | 2010 |
| Solomon Engiserv Ltd | Construction | 2025 |
| Solon Jacobs & Gold Ltd | Professional & scientific | 2017 |
| Solson Homes UK Limited Limited | Real estate | 2025 |
| Solutions AS Ltd | Information & communication | 2019 |
| Solvers Cleaning Services Limited | Administrative & support | 2022 |
| Solway Block Ltd | Other services | 2014 |
| Solworx Technologies Ltd | Information & communication | 2018 |
| Somerfield Road Residents Company Limited | Households | 1998 |
| Somuna International Limited | Construction | 2020 |
| Sonal & Hansa Limited | Real estate | 2018 |
| Sondhar Ltd | Real estate | 2024 |
| Songkran Limited | Hospitality | 2025 |
| Sonipat Limited | Public administration | 2025 |
| Sood & Sood Limited | Real estate | 2024 |
| Sood Property Ltd | Construction | 2021 |
| Soorya Consultancy Limited | Information & communication | 2014 |
| Soracle Group Limited | Arts & recreation | 2019 |
| Sosa Store Ltd | Wholesale & retail | 2023 |
| SOUL2ART Limited | Wholesale & retail | 2018 |
| Source Servers Limited | Information & communication | 2012 |
| Sourcx Ltd | Administrative & support | 2023 |
| South Quay Productions Ltd | Information & communication | 2024 |
| Southall Carpets Ltd | Wholesale & retail | 2015 |
| Southall Skip Hire Limited | Administrative & support | 2024 |
| Southern Crown Ltd. | Information & communication | 2019 |
| Southern Foods T/A Madras Flavours Restaurant Ltd | Wholesale & retail | 2018 |
| Southwest Offroad Ltd | Wholesale & retail | 2009 |
| Sovereign Osteopathy and Physiotherapy Limited | Health & social care | 2024 |
| Sovereign Table Limited | Hospitality | 2026 |
| Sovereign-Jireh Services Ltd | Transport & logistics | 2025 |
| Sovital Ltd | Wholesale & retail | 2021 |
| Sovran Aven Ltd | Wholesale & retail | 2025 |
| SP (Cranford) LLP | | 2019 |