| Swanton Consulting Group Ltd | Professional & scientific | 2025 |
| Swap Sure Limited | Administrative & support | 2023 |
| Swapam Services Ltd | Professional & scientific | 2017 |
| Swapcar Direct Ltd | Transport & logistics | 2022 |
| Swar Music & Event Promotion Company Limited | Arts & recreation | 2014 |
| Swaraj Assets Ltd | Real estate | 2025 |
| Swarn Enterprises Limited | Real estate | 2026 |
| Swarna Jewellers Ltd | Wholesale & retail | 2009 |
| Swas South Asian C.I.C. | Education | 2026 |
| Swastik Retail Store Limited | Wholesale & retail | 2025 |
| Swavyx Ltd | Information & communication | 2024 |
| Swaydesi Ltd | Wholesale & retail | 2025 |
| SWB Holdings (Midlands) Ltd | Financial services | 2026 |
| SWB Services Ltd | Professional & scientific | 2025 |
| Sweat Box Yoga Ltd | Manufacturing | 2013 |
| Sweeney Developments (Cumbria) Limited | Real estate | 2008 |
| Sweeney's Enterprises Limited | Hospitality | 1993 |
| Sweet and Slush Co Limited | Hospitality | 2024 |
| Sweet Cherry Publishing Limited | Information & communication | 2011 |
| Sweet Circle Ltd | Wholesale & retail | 2026 |
| Sweet Gifting Group Ltd | Wholesale & retail | 2026 |
| Sweet Gifting IP Ltd | Administrative & support | 2026 |
| Sweet Greetings & Just for Bubba Ltd | Wholesale & retail | 2022 |
| Sweet Initial Ltd | Wholesale & retail | 2024 |
| Sweet Intentions Ltd | Wholesale & retail | 2012 |
| Sweet Loves Ltd | Wholesale & retail | 2025 |
| Sweet Luxury Ltd | Wholesale & retail | 2020 |
| Sweet Temptations (Leicester) Ltd | Hospitality | 2011 |
| Sweet Threads Ltd | Manufacturing | 2017 |
| Sweet Treats Packaging Ltd | Administrative & support | 2020 |
| Sweet World Confectionery Ltd | Wholesale & retail | 2022 |
| Sweetheart Perfumes Ltd | Wholesale & retail | 2026 |
| Sweets & Scoops Ltd | Wholesale & retail | 2025 |
| Sweets Associates Limited | Arts & recreation | 2020 |
| Sweettoofz Evington Ltd | Hospitality | 2025 |
| Sweettoofz Leicester Limited | Hospitality | 2025 |
| Sweettoofzuk Ltd | Hospitality | 2021 |
| Sweety Shakes UK Ltd | Wholesale & retail | 2011 |
| Swift 789 Limited | Households | 1997 |
| Swift Chem-Tex Limited | Wholesale & retail | 1988 |
| Swift Cleaning and Maintenance Services Ltd | Administrative & support | 2025 |
| Swift Fitted Bedroom Services | | 1997 |
| Swift Fuel Group Ltd | Wholesale & retail | 2025 |
| Swift Healthcare Training & Recruitment Ltd | Administrative & support | 2019 |
| Swift Lofts Ltd | Construction | 2023 |
| Swift Motors (Leic) Ltd | Wholesale & retail | 2017 |
| Swift Shelter Ltd | Real estate | 2024 |
| Swift Shippings Ltd | Wholesale & retail | 2025 |
| Swift Tickets Limited | Wholesale & retail | 2022 |
| Swift Transfers Limited | Financial services | 2002 |
| Swift Windscreens Limited | Wholesale & retail | 2003 |
| Swiftingcart Ltd | Wholesale & retail | 2025 |
| Swiftshore Logistics Ltd | Transport & logistics | 2022 |
| Swim Fearless Ltd | Education | 2024 |
| Swim Station Ltd | Arts & recreation | 2014 |
| Swimsuit Dryer Company Ltd | Manufacturing | 2012 |
| Swincombe Logistics Ltd | Transport & logistics | 2014 |
| Swindell & Brown Electrical Services Limited | Manufacturing | 2000 |
| Swinfield Cooper Limited | Wholesale & retail | 2006 |
| Swipe & TAP Ltd | Information & communication | 2005 |
| Swiss Alpha Ltd | Information & communication | 2023 |
| Swiss Auto Services Ltd | Wholesale & retail | 2024 |
| Swiss Mountains Limited | Construction | 2024 |
| Switch 2 Smart Limited | Construction | 2022 |
| Switch Traders Ltd | Professional & scientific | 2023 |
| Switchpix Limited | Extraterritorial | 2016 |
| Switchup Trade Ltd | Wholesale & retail | 2023 |
| Swithland Developments Ltd | Construction | 2022 |
| Swithland Family Investment Company Limited | Financial services | 2025 |
| Swithland Power Ltd | Professional & scientific | 2021 |
| Swithland Properties (Mountsorrel) Limited | Real estate | 2026 |
| Swithland Shutters and Blinds Ltd | Wholesale & retail | 2020 |
| SWM Trading Ltd | Wholesale & retail | 2025 |
| Sword Consultants Ltd | Wholesale & retail | 2023 |
| SWR Investments Ltd | Real estate | 2023 |
| Swyncombe Limited | Professional & scientific | 2016 |
| Swytch Graphics Limited | Manufacturing | 2020 |
| SXE Ltd | Construction | 2011 |
| SY Build & Construction Ltd | Administrative & support | 2025 |
| Sycamore (Leicester) Limited | Health & social care | 2016 |
| Sycamore Legal Consultancy Limited | Professional & scientific | 2025 |
| Sycamore Meadows Homes Limited | Health & social care | 2013 |
| Sycamore Meadows Limited | Administrative & support | 2013 |
| Sycamore Meadows Properties Limited | Health & social care | 2013 |
| Sydon Limited | Health & social care | 2014 |
| Syed Advertisments Ltd | Information & communication | 2025 |
| Syed Kamal Frozen Foods Limited | Manufacturing | 2006 |
| Syed's Traders Ltd | Wholesale & retail | 2024 |
| Syfield Group Ltd | Construction | 2024 |
| SYG Management Ltd | Real estate | 2024 |
| Sykefield Avenue Management Company Limited | Households | 1991 |
| Sykefield Care Limited | Health & social care | 1993 |
| Sykes Surfacing Ltd | Construction | 2023 |
| Sylhet Abashon Private Limited | Real estate | 2025 |
| Sylvan Vine Real Estate Ltd | Real estate | 2025 |
| Sylvandell Limited | Professional & scientific | 1998 |
| Sylvia Mokwe Ltd | Public administration | 2022 |
| Symbiosis Consulting Limited | Agriculture & fishing | 2000 |
| Symc Ltd | Health & social care | 2024 |
| Symmetrica Ltd | Real estate | 2017 |