| Summit Racing Equipment Ltd. | Wholesale & retail | 2025 |
| Summit School of Leadership & Management (UK) Ltd. | Professional & scientific | 2013 |
| Sumosys UK Ltd | Manufacturing | 2026 |
| Sumpk Homes Ltd | Real estate | 2024 |
| Sun Foods PVT Ltd | Hospitality | 2025 |
| Sun IT Technologies Limited | Information & communication | 2022 |
| Sun Lotus Ltd | Wholesale & retail | 2025 |
| Sun MAR International Co. Ltd | Wholesale & retail | 2023 |
| Sun Solutions Consultancy Limited | Information & communication | 2011 |
| Sunat Transports Limited | Transport & logistics | 2023 |
| Suncooker Ltd | Other services | 2024 |
| Suncroft Healthcare Services Ltd | Health & social care | 2021 |
| Sundel Supple Ltd | Wholesale & retail | 2025 |
| Sunden Electrical Ltd | Construction | 2016 |
| Sunfeel Brands Ltd | Wholesale & retail | 2024 |
| Sunflower Bakery (Harrogate) Limited | Hospitality | 2024 |
| Sunflower BEE Ltd | Wholesale & retail | 2025 |
| Sunflower UK Cleaning Company Ltd | Administrative & support | 2025 |
| Sungrid Energy & Assets Ltd | Construction | 2026 |
| Sungrow Power UK Limited | Manufacturing | 2014 |
| Sunlit Technologies Ltd | Information & communication | 2018 |
| Sunmower Ltd | Other services | 2024 |
| Sunny Breaks Limited | Administrative & support | 2017 |
| Sunny Florist Ltd | Wholesale & retail | 2025 |
| Sunny Plant Nursery Ltd | Agriculture & fishing | 2016 |
| Sunnybourne Properties Ltd | Real estate | 2018 |
| Sunnyside Rare Breeds Limited | Agriculture & fishing | 2013 |
| Sunondha & Sudarshan Solutions Ltd | Information & communication | 2017 |
| Sunpower Corporation UK Limited | Energy | 2007 |
| Sunpower Systems Ltd | Other services | 2024 |
| Sunrise Healthcare Solutions Limited | Health & social care | 2017 |
| Sunrise Living Limited | Health & social care | 2024 |
| Sunrise Setting Limited | Administrative & support | 1995 |
| Sunrise Trading and Logistics Ltd | Wholesale & retail | 2025 |
| Sunset IT Distribution Ltd | Information & communication | 2017 |
| Sunshine City Ltd | Wholesale & retail | 2020 |
| Sunshine Family Ventures Limited | Health & social care | 2014 |
| Sunshine Hygiene Services Ltd | Administrative & support | 2026 |
| Sunsport Limited | Administrative & support | 1996 |
| Sunspot Records Limited | Other services | 2010 |
| Sunsystems Consulting Limited | Information & communication | 2017 |
| Suntech Systems Limited | Information & communication | 2003 |
| Supa Building Tahir Ltd | Construction | 2011 |
| Supafly Incorporated Ltd | Administrative & support | 2008 |
| Supboss Ltd | Arts & recreation | 2021 |
| Super Accounts Tax VAT and Payroll Ltd | Professional & scientific | 2011 |
| Super Cabs Ltd | Transport & logistics | 2019 |
| Super Camps Limited | Health & social care | 1996 |
| Super Cleaners MK Ltd | Administrative & support | 2025 |
| Superbrite Services Ltd | Administrative & support | 2010 |
| Superego Entertainment Ltd | Information & communication | 2025 |
| Superfeet Worldwide UK Limited | Wholesale & retail | 2011 |
| Superhealth+ Ltd | Wholesale & retail | 2020 |
| Superior Care Group Ltd | Health & social care | 2012 |
| Superior Finishes Painting Services Ltd | Construction | 2025 |
| Superior Sushi Ltd | Wholesale & retail | 2023 |
| Supermario Ltd | Transport & logistics | 2026 |
| Supermono Limited | Administrative & support | 2010 |
| Supernaturally Limited | Administrative & support | 2018 |
| Supernova Hire Services Ltd | Administrative & support | 2025 |
| Supersonic Inc Limited | Professional & scientific | 2018 |
| SUPPLIES4LYFE Ltd | Construction | 2023 |
| Supply Accommodation UK Limited | Administrative & support | 2021 |
| Support Innovations Ltd | Information & communication | 2025 |
| SUPPORT4HEALTH Limited | Public administration | 2025 |
| Supporttheartistuk Ltd | Arts & recreation | 2026 |
| Supramarketings Ltd | Information & communication | 2024 |
| Suprar Ltd | Information & communication | 2026 |
| Suprawin Info Solutions Limited | Information & communication | 2014 |
| Supreme Bedrooms Ltd | Construction | 2011 |
| Supreme Carpet Clean Ltd | Administrative & support | 2016 |
| Supreme Foenix Empire Limited | Transport & logistics | 2025 |
| Supreme JET Services Limited | Transport & logistics | 2017 |
| Sups Business Solutions Ltd | Administrative & support | 2017 |
| Sure Clean Services Ltd | Administrative & support | 2019 |
| Sure Co Ltd | Transport & logistics | 2024 |
| Sure Living Limited | Real estate | 2021 |
| Surf X Aylesbury Limited | Arts & recreation | 2024 |
| Surf X Group Limited | Arts & recreation | 2024 |
| Surgacoll Holdings (UK) Ltd | Wholesale & retail | 2017 |
| Surgi-Call Locums Limited | Administrative & support | 2008 |
| Surgical Advances Limited | Health & social care | 2023 |
| Surgical Fitness Ltd | Extraterritorial | 2024 |
| Surgical Instruments Group Holdings Limited | Manufacturing | 1995 |
| Surgical Invoicing Limited | Administrative & support | 2025 |
| Surgicure Ltd | Health & social care | 2019 |
| Surplusmed Limited | Wholesale & retail | 2020 |
| Surya Business Solution Ltd | Information & communication | 2015 |
| SUS Holdco 1 Limited | Construction | 2025 |
| Susan Farhang Ltd | Health & social care | 2021 |
| Sushi Club MK Ltd | Hospitality | 2021 |
| Sushi Papa MK Ltd | Hospitality | 2025 |
| Sushil Limited | Health & social care | 2012 |
| Sushruth Ltd | Real estate | 2019 |
| Sussex Baby Scans Ltd | Health & social care | 2015 |
| Sussex Building Co Limited | Construction | 2002 |
| Sussex Media Production Limited | Information & communication | 2024 |
| Sussex Refreshments Ltd | Wholesale & retail | 2022 |
| Sustaiin Ltd | Professional & scientific | 2024 |
| Sustain Talent Consulting Ltd | Administrative & support | 2002 |