| Stanmore Dairy Ltd | Wholesale & retail | 2013 |
| Star Carpentry Limited | Construction | 2016 |
| Star Electrical Contractors Limited | Construction | 2004 |
| Star Recovery Team Ltd | Professional & scientific | 2023 |
| Stardium Healthcare Limited | Administrative & support | 2022 |
| Starepoint Consultancy Limited | Professional & scientific | 2025 |
| Stargazey Spirits Ltd | Manufacturing | 2019 |
| Stargirls Beauty Empire Ltd | Other services | 2024 |
| Starlight Food Supplies Ltd | Wholesale & retail | 2026 |
| Starward Limited | Real estate | 1996 |
| Station Barber Pompey Ltd | Other services | 2025 |
| Station Garage & Tyres Ltd | Wholesale & retail | 2018 |
| Station Industrial Park Limited | Real estate | 2026 |
| Station News 1 Ltd | Wholesale & retail | 2025 |
| Station Road (Hayling Island) Limited | Construction | 2018 |
| Station Road Tyres Limited | Wholesale & retail | 2015 |
| Statoncoe Lettings Limited | Real estate | 2017 |
| Statoncoe Limited | Real estate | 2014 |
| Staura Properties Ltd | Real estate | 2025 |
| Stay Golden Investments Limited | Real estate | 2022 |
| STB Medical Ltd | Health & social care | 2026 |
| Steak Roast Limited | Hospitality | 2025 |
| Steam Car Wash Ltd | Wholesale & retail | 2020 |
| Stedman Groundworks & Sons Ltd | Construction | 2020 |
| Stedmans Skilled Services Ltd | Construction | 2019 |
| Steeden Property Development Limited | Construction | 1997 |
| Steephill Post House Limited | Real estate | 2025 |
| Stella Digital Ltd | Administrative & support | 2016 |
| Stella Drylining Ltd | Construction | 2026 |
| Stella Stay Homes Limited | Real estate | 2024 |
| Stellamar Executive Search Limited | Administrative & support | 2026 |
| Stellamar Group Limited | Administrative & support | 2024 |
| Stellamar REC 2 Limited | Administrative & support | 2025 |
| Stellamar REC 3 Limited | Administrative & support | 2025 |
| Stellamar REC 4 Limited | Administrative & support | 2025 |
| Stellamar REC 5 Limited | Administrative & support | 2025 |
| Stellamar REC 6 Limited | Administrative & support | 2025 |
| Stellamar Recruitment Limited | Administrative & support | 2015 |
| Stellar Consultancies Limited | Professional & scientific | 2025 |
| Stellar GAS Services Ltd | Construction | 2019 |
| Stellargrade Limited | Households | 1977 |
| Steller Limited | Information & communication | 2012 |
| Stem Talent Recruitment Limited | Administrative & support | 2022 |
| Stephan Painting & Decorating Ltd | Construction | 2024 |
| Stephen Bacon Tree Services Limited | Administrative & support | 2012 |
| Stephen G. Webb Limited | Construction | 2003 |
| Stephen Mark Anderson Limited | Professional & scientific | 2017 |
| Stephen Mckinven Limited | Construction | 2017 |
| Stephens Group Investments Limited | Administrative & support | 2024 |
| Stepping Stone Accommodation Ltd | Real estate | 2019 |
| Sterling Beds Limited | Wholesale & retail | 1992 |
| Sterling Improvements Ltd | Construction | 2019 |
| Sterling Properties Group Ltd | Real estate | 2024 |
| Sterling Saints Limited | Professional & scientific | 2024 |
| Stern Groundworks Ltd | Construction | 2024 |
| Steve Davis Graphic Design Ltd | Professional & scientific | 2013 |
| Steve LEE (Structures) Limited | Wholesale & retail | 2001 |
| Steve RAD Limited | Real estate | 2017 |
| Steve Terry Architects Limited | Professional & scientific | 2017 |
| Steve West Building Services Ltd | Construction | 2019 |
| Steven Johnson Limited | Construction | 2019 |
| Stewardship Wills and Probate Limited | Other services | 2011 |
| Stewart Interiors (Hampshire) Limited | Construction | 2023 |
| STF Practice Limited | Health & social care | 2012 |
| Sticky Media Solutions Limited | Other services | 2023 |
| Still Waters Care Services Limited | Health & social care | 2019 |
| Stillwells LLP | | 2015 |
| Stirling ALP Limited | Real estate | 2012 |
| Stitched With Style Ltd | Wholesale & retail | 2024 |
| Stlr Advisory Limited | Professional & scientific | 2025 |
| Stockhome Retail Limited | Wholesale & retail | 2022 |
| Stoddart Kitchens & Bathrooms Ltd | Construction | 2018 |
| Stoke Corner Cafe Ltd | Hospitality | 2026 |
| Stone Cycle Limited | Wholesale & retail | 2026 |
| Stone Green Landscapes Ltd | Administrative & support | 2019 |
| Stoneage Property Company Limited | Real estate | 2016 |
| Stonecoaching Limited | Education | 2025 |
| Stoneham Management IW Limited | Financial services | 2025 |
| Stoneworks Marble and Stone Ltd | Manufacturing | 2025 |
| Stop Shop Portsmouth Ltd | Wholesale & retail | 2025 |
| Stoppani GB Ltd | Wholesale & retail | 2023 |
| Storage Management NO1 Ltd | Transport & logistics | 2025 |
| Storage Management NO2 Ltd | Transport & logistics | 2025 |
| Storage Management NO3 Ltd | Transport & logistics | 2025 |
| Storage Storage Storage Ltd | Transport & logistics | 2023 |
| Store City Storage Ltd | Transport & logistics | 2023 |
| Storey Investments Ltd | Real estate | 2020 |
| Storm FM Ltd | Construction | 2009 |
| Storme Housing CIC | Hospitality | 2025 |
| Storrar Medical Limited | Health & social care | 2021 |
| STR Group Limited | Financial services | 2011 |
| STR Limited | Administrative & support | 2000 |
| Strategic Capital Consultants Limited | Professional & scientific | 2015 |
| Strategic Recruitment Partners Ltd | Administrative & support | 2015 |
| Stratford Court RTM Company Ltd | Households | 2018 |
| Strawberry Homes & Developments Limited | Professional & scientific | 2002 |
| Stream Resourcing Limited | Extraterritorial | 2017 |
| Streamline App Software Limited | Information & communication | 2026 |
| Street Electrical Ltd | Construction | 2019 |
| Street Fast Food Ltd | Hospitality | 2022 |