| Ssanyu Limited | Professional & scientific | 2013 |
| SSL Data Services Limited | Administrative & support | 2016 |
| Ssla Investments Limited | Financial services | 2020 |
| SSM Accountants Limited | Professional & scientific | 2011 |
| SSP Poole Holdings Limited | Financial services | 2026 |
| SSQ Estates Limited | Real estate | 2023 |
| ST Barbes Court (Bournemouth) Limited | Households | 2003 |
| ST Bridget's Admin Services Limited | Administrative & support | 2025 |
| ST Digital Solutions Limited | Wholesale & retail | 2025 |
| ST Georges Place (Poole) Limited | Construction | 2018 |
| ST James Court Flat Management Limited | Households | 2007 |
| ST Lawrence's Management Company (NO.2) Limited | Real estate | 2005 |
| ST Margaret's Guest House Ltd | Hospitality | 2024 |
| ST Mechanical & Building Solutions Limited | Energy | 2026 |
| ST Tropez Club Ltd | Hospitality | 2023 |
| ST. Botolph's Mews Managers Limited | Households | 1992 |
| ST. Mary's (Hulme) Management Limited | Households | 2005 |
| ST. Mary's Courtyard (Hulme 6) Management Company Five Limited | Real estate | 1999 |
| ST. Mary's Courtyard (Hulme 6) Management Company SIX Limited | Households | 1999 |
| ST. Patrick Healthcare Limited | Administrative & support | 2017 |
| Staddlestones Property Limited | Real estate | 2016 |
| Stadium Experience Ltd | Other services | 2025 |
| Stag Builders Ltd | Construction | 2019 |
| Stag Home Improvements Ltd | Construction | 2018 |
| Stag Property Group Limited | Households | 2021 |
| Stage Door School of Dancing Limited | Arts & recreation | 1988 |
| Stagwell Holdings Limited | Real estate | 2021 |
| Stai Ltd | Real estate | 2022 |
| Stai Management Ltd | Real estate | 2023 |
| Stairway Joinery Holdings Limited | Financial services | 2022 |
| Stairway Joinery Southern Limited | Manufacturing | 2013 |
| Stake Worldwide Ltd | Administrative & support | 2018 |
| Stamemge Ltd | Real estate | 2019 |
| Stampwood Limited | Professional & scientific | 2010 |
| Stanborough Homes Ltd | Other services | 2019 |
| Stanbridge Property Developments Limited | Real estate | 2017 |
| Stand OUT Signs Limited | Administrative & support | 2009 |
| Standalone Complex Consulting Limited | Information & communication | 2019 |
| Standard UK Management, Limited | Hospitality | 2014 |
| Standish Grove Management Company Limited | Households | 1982 |
| Stanfield Garage BMW & Mini Specialist Ltd | Wholesale & retail | 2025 |
| Stanfield Garage Limited | Wholesale & retail | 2018 |
| Stanley Green Flats (Management) Limited | Hospitality | 1974 |
| Stanley House RTM Company Limited | Households | 2010 |
| Stanner Electrical Ltd | Construction | 2021 |
| Stansmore (Builders) Limited | Construction | 1947 |
| Stanton Court (Parkstone) Limited | Households | 1959 |
| Star 1 Catering Ltd | Hospitality | 2025 |
| Star 1 Cleaning Ltd | Administrative & support | 2024 |
| Star Chamber Ltd | Information & communication | 2022 |
| Star Cuisine Ltd | Hospitality | 2014 |
| Star Roofs Ltd | Construction | 2024 |
| Star Tally Limited | Information & communication | 2025 |
| Star Tech EV Ltd | Wholesale & retail | 2015 |
| Star Tech Limited | Wholesale & retail | 2009 |
| Star&Marketing Limited | Wholesale & retail | 2025 |
| Starcrew Ltd | Transport & logistics | 2026 |
| Stardaise Limited | Real estate | 2024 |
| Stardust Consulting Ltd | Professional & scientific | 2021 |
| Stargate Technologies Ltd | Information & communication | 2024 |
| Starhost Group Limited | Hospitality | 2020 |
| Starlit Lion Games Ltd | Information & communication | 2026 |
| Starmint S.A.V. Limited | Wholesale & retail | 2021 |
| Starrise Property Developments Ltd | Real estate | 2026 |
| Stars Trust | Education | 2013 |
| Starspire Automations LLP | | 2025 |
| Starstone Ltd | Manufacturing | 2023 |
| Start Safe Internet Ltd | Information & communication | 2018 |
| Starts and Parts Ltd | Wholesale & retail | 2022 |
| State Group Ltd | Wholesale & retail | 2025 |
| Static Rentals Online Ltd | Hospitality | 2025 |
| Station Lodge Services Limited | Administrative & support | 2014 |
| Status Lettings Limited | Real estate | 2012 |
| Statutory Safeguarding Compliance Partners Ltd | Education | 2026 |
| Stauber Technik Ltd | Manufacturing | 2019 |
| Stay-Safe Scaffold Products Ltd | Extraterritorial | 2021 |
| Stayatours Ltd | Real estate | 2025 |
| Stayntab Ltd | Hospitality | 2025 |
| STB Electrical Wholesale Ltd | Wholesale & retail | 2009 |
| Stco Solutions Limited | Professional & scientific | 2007 |
| Steam Academy Live CIC | Education | 2026 |
| Steamed Limited | Wholesale & retail | 2025 |
| Steel and Scale Games Ltd | Wholesale & retail | 2023 |
| Steel Beams Direct Limited | Wholesale & retail | 2019 |
| Steel Hair Design Limited | Other services | 2009 |
| Steel Life (Perry Barr) Limited | Professional & scientific | 2022 |
| Steel Life (ST Helens) Limited | Professional & scientific | 2022 |
| Steel Life Group Limited | Professional & scientific | 2021 |
| Steel Reinforcement Dorset Ltd | Construction | 2023 |
| Stela Property Developments Ltd | Construction | 2025 |
| Stela Property Limited | Real estate | 2023 |
| Stelia Ltd | Information & communication | 2021 |
| Stelia Professional Services Ltd | Wholesale & retail | 2024 |
| Stella Essentia Ltd | Manufacturing | 2025 |
| Stella&Roxy Ltd | Manufacturing | 2024 |
| Stellar Academy Ltd | Education | 2024 |
| Stellar Core Ltd | Wholesale & retail | 2025 |
| Stellarfitness-X Ltd | Wholesale & retail | 2021 |
| Stellation Labs Ltd | Information & communication | 2025 |
| Stellr Capital Limited | Professional & scientific | 2019 |