| Sunrannoch Limited | Real estate | 2013 |
| Sunrise Business Services Ltd | Professional & scientific | 2026 |
| Sunshine Accounts Ltd | Professional & scientific | 2024 |
| Super 3 Ltd | Manufacturing | 2019 |
| Super Gift Vape Ltd | Wholesale & retail | 2025 |
| Superday Ltd | Real estate | 2024 |
| Superframe VFX Ltd | Information & communication | 2014 |
| Suppermpoon Ltd | Hospitality | 2025 |
| Supplier Day Ltd | Other services | 2020 |
| Supply Chain Project Management Limited | Professional & scientific | 2008 |
| SUR Old Library Management Company Limited | Households | 2020 |
| Surrey Heritage Construction Ltd | Construction | 2020 |
| Surveylink Network Ltd | Construction | 2026 |
| Surveyshack (SSL) Ltd | Information & communication | 2013 |
| Susbu Cafe Ltd | Hospitality | 2026 |
| Sushe Properties Limited | Real estate | 2021 |
| Sussex Historics Limited | Wholesale & retail | 2018 |
| Sustainable Green Solutions Limited | Other services | 2011 |
| Sustainable Structures Limited | Construction | 2024 |
| Sutherland Investment Property Ltd | Real estate | 2012 |
| Sutton High RTM Company Limited | Households | 2011 |
| Sutton Mead Limited | Agriculture & fishing | 2012 |
| Suzie Reyes-Nichol Lshc Rshom Mshc Ltd | Health & social care | 2024 |
| SVS Shrewton Vehicle Services Limited | Wholesale & retail | 2021 |
| SW Electrical Services (Wiltshire) Ltd | Construction | 2018 |
| SW Veitch Orthopaedics Limited | Health & social care | 2019 |
| Swan Grange Management Company Limited | Households | 2007 |
| Swan Morgan Associates Limited | Information & communication | 2022 |
| Swan Song Ventures Limited | Professional & scientific | 2023 |
| Swan Strategy Limited | Administrative & support | 2004 |
| Swanbee Ltd | Professional & scientific | 2015 |
| Swanton Farms Limited | Agriculture & fishing | 2014 |
| Swatt Books Limited | Information & communication | 2011 |
| Swaynes Business Park Limited | Administrative & support | 2022 |
| Swaynes House (NO. 2) Limited | Hospitality | 1978 |
| Swaynes House Limited | Administrative & support | 1977 |
| Swcw Limited | Information & communication | 2003 |
| SWE Vision Engineering Ltd | Information & communication | 2021 |
| Sweep Cleaning Solutions Ltd | Administrative & support | 2026 |
| Sweet Fusion Ltd | Wholesale & retail | 2024 |
| Sweeters Field (Alfold) Management Company Limited | Real estate | 2019 |
| Sweetie BUS Limited | Wholesale & retail | 2013 |
| Sweets and Sour Ltd | Wholesale & retail | 2022 |
| SWF Environmental Limited | Professional & scientific | 2021 |
| Swiftdel Limited | Other services | 2012 |
| Swiftflow Supplies Limited | Wholesale & retail | 2004 |
| Swiftime Limited | Other services | 1987 |
| Swiftsupli Ltd | Professional & scientific | 2018 |
| Swilcan Limited | Wholesale & retail | 2023 |
| Switch Performance Ltd | Professional & scientific | 2015 |
| Switchback Limited | Professional & scientific | 2025 |
| Swph Freeholds Limited | Real estate | 2020 |
| SWU Ltd | Information & communication | 2024 |
| Sy&Z Ltd | Information & communication | 2025 |
| Sycamore House (Verwood) Management Company Limited | Households | 2021 |
| Syd's Slaps Limited | Hospitality | 2020 |
| Sylvan (Ruddington) Management Company Limited | Households | 2025 |
| Sylvan Plumbing & Heating Limited | Construction | 2003 |
| Symaview Ltd | Professional & scientific | 2016 |
| Symbiosphere Ltd | Professional & scientific | 2026 |
| Symonds Event Catering Ltd | Hospitality | 2016 |
| Symonds Leisure Services Limited | Hospitality | 1980 |
| Syndicate Group Southern Ltd | Professional & scientific | 2015 |
| Synergy Business Solutions Limited | Information & communication | 2022 |
| Synergy Funding Ltd | Construction | 2025 |
| Synergy Lending Ltd | Construction | 2025 |
| Synima Group Limited | Professional & scientific | 2019 |
| Synovelle Limited | Manufacturing | 2007 |
| System Bookings Limited | Information & communication | 2011 |
| Systemport Limited | Other services | 2001 |
| Sytec Limited | Extraterritorial | 2015 |
| Szatmari Ltd | Administrative & support | 2022 |
| T & J Baxter Farming Limited | Agriculture & fishing | 2014 |
| T & L Pullman Limited | Wholesale & retail | 2023 |
| T and R Investments Limited | Real estate | 2000 |
| T C I Properties Limited | Real estate | 2003 |
| T Dorr Ltd | Construction | 2012 |
| T E J Foster Consulting Limited | Administrative & support | 2023 |
| T G Cruse Groundworks Limited | Construction | 2004 |
| T J Automotive Salisbury Ltd | Wholesale & retail | 2022 |
| T J Munns Consulting Limited | Professional & scientific | 2018 |
| T K White & Co Limited | Financial services | 2003 |
| T Littlefair Garden Maintenance Ltd | Administrative & support | 2025 |
| T M Trustees Limited | Financial services | 1995 |
| T S Knight Limited | Professional & scientific | 2013 |
| T Selby Limited | Wholesale & retail | 2014 |
| T Signs Limited | Manufacturing | 1999 |
| T Smith Plumbing and Heating Limited | Construction | 2022 |
| T&J Reece Ltd | Transport & logistics | 2023 |
| T&S Financial Ltd | Financial services | 2026 |
| T. a. Green & Sons (Down Farms) Limited | Agriculture & fishing | 1964 |
| T. Birch (Developments) (IW) Limited | Construction | 2002 |
| T.H. Russell Trustee Limited | Health & social care | 2014 |
| T.H.Plumridge Limited | Real estate | 1954 |
| T.K Building & Landscaping Ltd | Administrative & support | 2024 |
| T.S. Comms Limited | Administrative & support | 2006 |
| TA 360 Ltd | Administrative & support | 2025 |
| Tabby B. Limited | Manufacturing | 2020 |
| Tabsuk Ltd | Real estate | 2012 |
| TAC Technology Limited | Information & communication | 2021 |