| Sugatip Limited | Wholesale & retail | 2023 |
| Suhrad Vihar Ltd | Real estate | 2020 |
| Suhradam Limited | Wholesale & retail | 2020 |
| SUI Generis Solutions UK Limited | Professional & scientific | 2014 |
| Suitespot Ltd | Information & communication | 2012 |
| Sukhadiya Properties Ltd | Real estate | 2020 |
| Sulayla Beauty Ltd | Wholesale & retail | 2021 |
| Suli Watford Ltd | Manufacturing | 2025 |
| Sull BRO Ltd | Financial services | 2024 |
| Sullivan Brothers Construction Ltd | Construction | 2016 |
| Sullivan Property Holdings Limited | Real estate | 2021 |
| Sulova Group Ltd | Construction | 2025 |
| Sulshi Investments Limited | Real estate | 2024 |
| SUM Global Limited | Professional & scientific | 2017 |
| Suman Healthcare Limited | Health & social care | 2026 |
| Suman Property Investments Limited | Real estate | 2017 |
| Sumanjg Limited | Real estate | 2025 |
| Sumaria Property Group Ltd | Real estate | 2019 |
| Sumco Investments Limited | Real estate | 2012 |
| Sumi Consulting Ltd | Professional & scientific | 2024 |
| Summerouse Ltd | Real estate | 2024 |
| Summerstown Dental Centre Limited | Health & social care | 2010 |
| Summit and Scale Ltd | Professional & scientific | 2026 |
| Summit Asset Group Ltd | Wholesale & retail | 2025 |
| Summit Health Watford Ltd | Health & social care | 2016 |
| Sun 2510 Limited | Administrative & support | 2017 |
| Sun Bakery Ltd | Hospitality | 2021 |
| Sun Postal Sports & Social Club Limited | Arts & recreation | 1994 |
| Sun Ross Ltd | Hospitality | 2025 |
| Sunavi UK Ltd | Other services | 2022 |
| Sunbeams Properties Limited | Hospitality | 2021 |
| Sundays and Sundays Ltd | Real estate | 2026 |
| Sundial Information Services Limited | Information & communication | 2001 |
| Sundown Studios Ltd | Information & communication | 2024 |
| Sundra Consulting Engineers Limited | Professional & scientific | 2024 |
| Sunfish Consulting Ltd. | Administrative & support | 2015 |
| Sunfish Online Limited | Information & communication | 2016 |
| SUNFLOWER14 Ltd. | Information & communication | 2015 |
| Sunleigh Estates LLP | | 2005 |
| Sunlight Engineering and Technology Limited | Information & communication | 2024 |
| Sunmach Ltd | Wholesale & retail | 2024 |
| Sunnah Events Ltd | Administrative & support | 2025 |
| Sunnah Remedies Ltd | Wholesale & retail | 2025 |
| Sunnen Products Limited | Wholesale & retail | 1994 |
| Sunningwell Consulting Ltd | Manufacturing | 2015 |
| Sunnyfield VEG Limited | Wholesale & retail | 1996 |
| Sunray Events Limited | Hospitality | 2025 |
| Sunray TK Limited | Administrative & support | 2003 |
| Sunreys Ltd | Construction | 2014 |
| Sunrise Change Limited | Professional & scientific | 2011 |
| Sunrise City Ltd | Other services | 2010 |
| Sunsan Estates Limited | Construction | 2019 |
| Sunshine & Rain Ltd | Education | 2022 |
| Sunshine IT Ltd | Information & communication | 2010 |
| Suntam Limited | Information & communication | 2023 |
| Super After Curry Mint Inc. Ltd | Wholesale & retail | 2025 |
| Super Chips U.K Ltd | Hospitality | 2019 |
| Super Express Global Ltd | Transport & logistics | 2022 |
| Super Plus Coach Ltd | Transport & logistics | 2018 |
| Super Steps Acai Ltd | Hospitality | 2025 |
| Super Steps Nursery Limited | Education | 2024 |
| Super Utensil Ltd | Wholesale & retail | 2013 |
| Super Vision Security Limited | Administrative & support | 2016 |
| Superb Mortgages Ltd | Financial services | 2015 |
| Superior HCM Ltd | Construction | 2017 |
| Superior Scalps Ltd | Other services | 2018 |
| Superlogistics Ltd | Transport & logistics | 2018 |
| Superspeed Deals Ltd | Wholesale & retail | 2025 |
| Superspot Limited | Information & communication | 2012 |
| Superstepscafe Ltd | Hospitality | 2023 |
| Superstepsn Ltd | Hospitality | 2023 |
| Supple Site Services Ltd | Administrative & support | 2018 |
| Supplier Development Ltd | Professional & scientific | 2015 |
| Supplynow Limited | Information & communication | 2016 |
| Support UK Today Ltd | Administrative & support | 2023 |
| Supreme Hotels LLP | | 2011 |
| Supreme Support & Care Limited | Administrative & support | 2018 |
| Supreme Ventures Ltd | Administrative & support | 2020 |
| Surasit Limited | Information & communication | 2021 |
| Surefit Limited | Wholesale & retail | 1997 |
| Suregrowth Ltd | Information & communication | 2012 |
| Surface Deep Ltd | Administrative & support | 2026 |
| Surgery 5 Limited | Real estate | 2025 |
| Surplusapp Limited | Information & communication | 2025 |
| Surreal Attire Ltd | Wholesale & retail | 2022 |
| Surrey GP Limited | Health & social care | 2008 |
| Surrey Maintenance+ Ltd | Construction | 2026 |
| Surrey Roofing Group Ltd | Construction | 2025 |
| Surveyors Corporation Limited | Professional & scientific | 2006 |
| Surveys for London Limited | Construction | 2013 |
| Sushan Limited | Wholesale & retail | 2011 |
| Sushan Properties Limited | Real estate | 2023 |
| Sushi Fabrique Limited | Hospitality | 2018 |
| Sushi SHO Ltd | Hospitality | 2025 |
| Sushi-No-Mai Limited | Hospitality | 2014 |
| Sustain Electric Limited | Construction | 2021 |
| Sustain Heat Limited | Construction | 2024 |
| Sustain Homes Limited | Construction | 2020 |
| Sustain Investment Group Limited | Financial services | 2024 |
| Sustainable Film Ltd | Information & communication | 2021 |