| Solent Boat Works Ltd | Manufacturing | 2017 |
| Solent Corporate Holdings Ltd | Financial services | 2025 |
| Solent Ecology Ltd | Professional & scientific | 2025 |
| Solent Marine Limited | Construction | 1991 |
| Solid AS the Rock Limited | Extraterritorial | 2019 |
| Soloutions Limited | Professional & scientific | 2010 |
| Sosase Chocolat Ltd | Manufacturing | 2021 |
| Soul Consulting Ltd | Construction | 2024 |
| Sourced East Portsmouth Ltd | Real estate | 2019 |
| South by North Ltd | Administrative & support | 2015 |
| South Coast Print Ltd | Manufacturing | 2026 |
| Southcoast Estates Management Ltd | Real estate | 2024 |
| Southern Power Services Limited | Construction | 2017 |
| Southern Timber Construction Limited | Construction | 2007 |
| Southwood (Hayling Island) Property Company Limited | Households | 1998 |
| Southwood Road Management Company Limited | Households | 1990 |
| Southwood Spice Ltd | Hospitality | 2021 |
| Sovereign Flooring Ltd | Wholesale & retail | 2013 |
| Sovereign Millennium Investments Limited | Real estate | 1998 |
| Sovereign Printers Limited | Information & communication | 2015 |
| Spare Change Films Ltd | Information & communication | 2012 |
| Sparkes Craning Ltd | Manufacturing | 2024 |
| Sparra Engineering Ltd | Construction | 2024 |
| Spencer Close Flat Management Company Limited | Real estate | 1991 |
| Spilsted & Sons Limited | Agriculture & fishing | 2007 |
| Spitimou Ltd | Households | 2019 |
| Sports Creative Network Limited | Professional & scientific | 2026 |
| SR Woodcraft Ltd | Agriculture & fishing | 2019 |
| SRS Management Holdings Ltd | Financial services | 2012 |
| ST Andrews House Residents Association Ltd. | Households | 1991 |
| ST Hermans Estate Co Limited | Hospitality | 1946 |
| Stadia Construction Ltd | Construction | 2024 |
| Stamshaw Computers Ltd | Manufacturing | 2025 |
| Stanmark IT Solutions Ltd | Information & communication | 2021 |
| Stanmark Ltd | Other services | 2021 |
| Stantools Ltd | Manufacturing | 2020 |
| Star of Hayling Ltd | Hospitality | 2017 |
| Stareo Limited | Construction | 2020 |
| Steele Plumbing and GAS Limited | Construction | 2021 |
| Steinway Estates Ltd | Households | 2016 |
| Stenzy Ltd | Administrative & support | 2021 |
| Steven Lawson Limited | Construction | 2005 |
| Stoke Fruit Farm Limited | Agriculture & fishing | 2010 |
| Streamteck Limited | Administrative & support | 2011 |
| Stuart of Z Consulting Ltd | Information & communication | 2022 |
| Summerhouse Management Company (Lynmouth) Limited | Other services | 2004 |
| Summersdale Garage (Chichester) Limited | Wholesale & retail | 1994 |
| Sun & Glow Limited | Other services | 2024 |
| Sunnie Matcha Ltd | Manufacturing | 2026 |
| Sunnyside Management Company Ltd | Households | 1989 |
| Super Vape Store UK Limited | Wholesale & retail | 2025 |
| Superrb Limited | Information & communication | 2011 |
| Support the Homeless | Health & social care | 2018 |
| Swift Action Sports Ltd | Arts & recreation | 2026 |
| Syke Hayling Ltd | Professional & scientific | 2017 |
| Systemic Procurement Solutions Ltd | Professional & scientific | 2026 |
| Talk Freely Limited | Information & communication | 2004 |
| TAN Audio (U.K.) Limited | | 1986 |
| Tanique Tanning Ltd | Other services | 2026 |
| TBO Romsey Ltd | Real estate | 2006 |
| TC Sales & Distribution Ltd | Other services | 2014 |
| TCS Freight Limited | Transport & logistics | 2009 |
| Teandlo Limited | Wholesale & retail | 2022 |
| Technically Awair Limited | Professional & scientific | 2006 |
| THE BA Experience Ltd | Education | 2025 |
| THE Bike Bunker Ltd | Wholesale & retail | 2025 |
| THE British Two Stroke Club Limited | Arts & recreation | 2003 |
| THE Charred Onion Ltd | Hospitality | 2025 |
| THE Crew House Limited | Administrative & support | 2008 |
| THE Gallery at Hayling Ltd | Arts & recreation | 2024 |
| THE Hayling Cleaning Company Limited | Administrative & support | 2015 |
| THE Hayling Cobbler Limited | Other services | 2026 |
| THE Hygiene Therapist Ltd | Health & social care | 2025 |
| THE Lilacs Management Company Limited | Households | 1991 |
| THE Living Apothecary Group Ltd | Real estate | 2025 |
| THE OPS. Art Ltd | Wholesale & retail | 2014 |
| THE Rustic Pour LLP | | 2026 |
| THE Westbourne Beauty Clinic Limited | Other services | 2011 |
| Themis Properties Limited | Real estate | 2018 |
| Thinkboxuk Ltd | Manufacturing | 2017 |
| Three Hayling Properties Limited | Households | 2003 |
| Tilbrook Consulting Limited | Professional & scientific | 2019 |
| TKB Limited | Construction | 2020 |
| Tradco (Malta) Ltd | Wholesale & retail | 2018 |
| Tread Rail Ltd | Other services | 2018 |
| Trevdell Limited | Wholesale & retail | 2006 |
| Trevor Wallis Consultancy Limited | Professional & scientific | 2013 |
| Trueblue Building and Maintenance Ltd | Construction | 2025 |
| TT Design Ltd | Manufacturing | 2018 |
| Ttrentals Limited | Real estate | 2024 |
| Tungsten Blue LLP | | 2004 |
| Turtles Day Nursery Limited | Education | 2012 |
| Twiss Consultancy Limited | Information & communication | 2024 |
| Twisted Lime (Corporate Events) Limited | Wholesale & retail | 2016 |
| Tyme HR Limited | Professional & scientific | 2002 |
| UK Gymnastics Ltd | Other services | 2024 |
| Ukceuticals Ltd | Administrative & support | 2022 |
| Ultra Fender Ltd | Wholesale & retail | 2018 |
| Unification Consultancy Limited | Administrative & support | 2024 |
| Unique Portsmouth Ltd | Wholesale & retail | 2024 |