| Sky Cars Limited | Transport & logistics | 2015 |
| Sky High Maintenance Ltd | Manufacturing | 2024 |
| Skyfell Limited | Administrative & support | 2014 |
| Slap Management Ltd | Professional & scientific | 2025 |
| Slate Financial Holdings Ltd | Financial services | 2015 |
| Slate Insulations Ltd | Construction | 2013 |
| Slicedproducts Ltd | Wholesale & retail | 2024 |
| Sloane Stanley Court Management Company Limited | Households | 1989 |
| SM Boilers GAS Heating Limited | Administrative & support | 2023 |
| SM Bookkeeping (Gosport) Ltd | Professional & scientific | 2025 |
| Small Paul Limited | Arts & recreation | 2013 |
| Small Vessel Engineer Tutor Ltd | Education | 2024 |
| Smartrental Ventures Ltd | Real estate | 2024 |
| SMD Computers Ltd | Information & communication | 2024 |
| SME Web Services Limited | Wholesale & retail | 2012 |
| Smile Ambassador Ltd | Health & social care | 2024 |
| Smith Brothers Marine Limited | Construction | 1996 |
| Smith Manufacturing Ltd | Manufacturing | 2023 |
| SML Management Co. Limited | Administrative & support | 1996 |
| Smoke N Slice Ltd | Hospitality | 2025 |
| SMT Building Design Services Ltd | Professional & scientific | 2020 |
| Snacked Life Limited | Wholesale & retail | 2025 |
| Snark Ltd | Transport & logistics | 2015 |
| Snowball Automotive Ltd. | Wholesale & retail | 2017 |
| Sobczak Limited | Wholesale & retail | 2016 |
| Social Raomers Ltd | Administrative & support | 2026 |
| Socss Limited | Construction | 2026 |
| Softedge Digital Limited | Information & communication | 2018 |
| Software Programming Solutions Limited | Administrative & support | 2011 |
| Solent Architecture Ltd | Professional & scientific | 2021 |
| Solent Autoclave Services Ltd | Professional & scientific | 2018 |
| Solent Building Supplies Limited | Wholesale & retail | 1991 |
| Solent Cleaning Services Ltd | Administrative & support | 2025 |
| Solent Commercial Management Limited | Construction | 2018 |
| Solent Communications Ltd | Wholesale & retail | 2019 |
| Solent Energy Solutions Limited | Financial services | 2022 |
| Solent Estate Management Ltd | Hospitality | 2018 |
| Solent Fencing Limited | Administrative & support | 2016 |
| Solent Garage Services (Stubbington) Limited | Wholesale & retail | 2017 |
| Solent Garage Services Limited | Households | 2011 |
| Solent Garden Buildings Limited | Administrative & support | 2026 |
| Solent Heavy Vehicle Services Ltd | Wholesale & retail | 2023 |
| Solent Holiday Homes Limited | Real estate | 2015 |
| Solent Mobility Centre Limited | Extraterritorial | 2008 |
| Solent Powder Coatings Limited | Construction | 2002 |
| Solent Property Investments Ltd | Real estate | 2017 |
| Solent Repairs Limited | Other services | 2020 |
| Solent Sports and Classics Ltd | Wholesale & retail | 2020 |
| Solent Swim School Ltd | Education | 2019 |
| Solent Taverns Limited | Hospitality | 2025 |
| Solent Training Solutions Limited | Education | 2025 |
| Solent Transport & Recovery Ltd | Transport & logistics | 2024 |
| Solent Womens Fitness Limited | Arts & recreation | 2006 |
| Solent Wood Burners Ltd | Construction | 2015 |
| Solid Foundation Property Limited | Real estate | 2017 |
| Solved FM Limited | Construction | 2015 |
| Solved M & E Limited | Energy | 2015 |
| Somefink Limited | Administrative & support | 2024 |
| Sonny Brown Ltd | Construction | 2018 |
| Sophie Lait Ltd | Arts & recreation | 2025 |
| South Coast Appliances Limited | Wholesale & retail | 2017 |
| South Coast Aviation Limited | Professional & scientific | 2012 |
| South Coast Furnishings Limited | Manufacturing | 2009 |
| South Coast Service Providers Limited | Real estate | 2024 |
| South Coast Solutions Ltd | Construction | 2026 |
| South Garden Fencing Ltd | Construction | 2021 |
| Southdowns Letting and Management Limited | Real estate | 2006 |
| Southern Blast and Paint Ltd | Construction | 2020 |
| Southern Counties Air Conditioning and Refrigeration Ltd | Manufacturing | 2013 |
| Southern Mobile Hydraulics Ltd | Other services | 2025 |
| Southern Steel & Formwork Limited | Construction | 2014 |
| Southern Voltage Services Ltd | Construction | 2022 |
| Southernbrook ( Surrey ) Limited | Real estate | 2022 |
| Southernbrook (Gosport) Limited | Real estate | 2022 |
| Southernbrook Lettings Limited | Real estate | 2013 |
| Southernbrook Limited | Real estate | 2001 |
| Southteq Ltd | Wholesale & retail | 2022 |
| Southwell Construction Ltd | Construction | 2026 |
| Space Exchange Group Limited | Information & communication | 2026 |
| Space Exchange TV Limited | Information & communication | 2026 |
| Sparks Training Ltd | Education | 2025 |
| Sparktech Fabrications Limited | Manufacturing | 2006 |
| Sparkwell Systems Ltd | Extraterritorial | 2013 |
| Specialized Design and Management Solutions Ltd | Professional & scientific | 2026 |
| Specialized Fabrications (Architectural) Limited | Construction | 2014 |
| Sphere Connections Limited | Other services | 2025 |
| Spice 53 Limited | Hospitality | 2026 |
| Spice World Gosport Limited | Hospitality | 2025 |
| Spinnaker Print Limited | Manufacturing | 2009 |
| Spinnaker Yacht Wear Ltd | Wholesale & retail | 2023 |
| Spitty Space Limited | Professional & scientific | 2023 |
| SPL HC Ltd | Financial services | 2014 |
| SPO Logistics Ltd | Transport & logistics | 2026 |
| Sports Gamer Pro Ltd | Arts & recreation | 2021 |
| Sports Massage With Jamie Ltd | Health & social care | 2025 |
| Spotless Clean Solution Ltd | Administrative & support | 2025 |
| SPS Farriery Practice Ltd | Administrative & support | 2024 |
| Square One Electrical Contractors Ltd | Construction | 2020 |
| Square RIG Tailoring Limited | Manufacturing | 2022 |
| ST. John's Foods Ltd | Manufacturing | 2020 |