| ST. Vincent Care Homes Limited | Health & social care | 2000 |
| Stag Systems Holdings Ltd | Financial services | 2024 |
| Stag Systems Ltd | Administrative & support | 2019 |
| Staged Management Events Ltd | Arts & recreation | 2019 |
| Standardaero (UK) Holdings Limited | Administrative & support | 2021 |
| Star Group Investments Limited | Real estate | 2018 |
| Star Royalty UK C.I.C. | Arts & recreation | 2024 |
| Starbak Limited | Wholesale & retail | 2022 |
| Starboard Media Ltd | Information & communication | 2013 |
| Starr Helicopter Limited | Manufacturing | 2017 |
| Starvale Developments Ltd | Administrative & support | 2013 |
| Station Taxi FRM Ltd Ltd | Transport & logistics | 2025 |
| Staunton Festival Limited | Other services | 2025 |
| Stay Lucky Ltd | Information & communication | 2017 |
| Steady Steps Pre-School | Education | 2007 |
| Stec Construction Limited | Construction | 2003 |
| Stella HC | Extraterritorial | 2014 |
| Stella Investments Ltd | Financial services | 2005 |
| Stellski Marine Composites Ltd | Manufacturing | 2017 |
| Stepping Stone Consulting Limited | Professional & scientific | 2010 |
| Steps Within CIC | Health & social care | 2025 |
| Stfc Renovations Limited | Construction | 2023 |
| Stml Energy Limited | Construction | 2014 |
| Stock Homes Hampshire Limited | Real estate | 2024 |
| Stock Independent Virtual Assistant Limited | Extraterritorial | 2026 |
| Stocks Properties Limited | Real estate | 2024 |
| Stoev Logistics Ltd | Transport & logistics | 2019 |
| Stokes Bay Builders and Developments Ltd | Construction | 2020 |
| Stokes Bay Sailing Club Limited | Arts & recreation | 2022 |
| Stokesway Kitchen Ltd | Hospitality | 2024 |
| Stone Horse Event Services Ltd | Administrative & support | 2023 |
| Store N Secure Limited | Real estate | 2019 |
| Storer Homes Ltd | Construction | 2002 |
| Stott, Hope & Robson Ltd | Professional & scientific | 2025 |
| Stoves Hampshire Ltd | Construction | 2014 |
| Stratos Support Solutions Ltd | Manufacturing | 2026 |
| Stratton IT Limited | Information & communication | 2019 |
| Stratton Lettings Ltd | Real estate | 2023 |
| Strife Consultants Limited | Information & communication | 2025 |
| Stripe Five Ltd | Professional & scientific | 2024 |
| Stronmoor House Management Limited | Households | 2005 |
| STS Defence Limited | Manufacturing | 1996 |
| Stuart Burridge Ltd | Information & communication | 2010 |
| Stuckton Ironworks Ltd | Wholesale & retail | 2025 |
| Subniroj Co Ltd | Wholesale & retail | 2024 |
| Sucina Limited | Construction | 2014 |
| Sullys Retail Ltd | Wholesale & retail | 2026 |
| Sultan Grill Gosport Ltd | Hospitality | 2025 |
| Sultan Grill Limited | Hospitality | 2023 |
| Suma Spice Ltd | Hospitality | 2025 |
| Sun Temple Gosport Limited | Other services | 2014 |
| Sunday Strategy Limited | Professional & scientific | 2026 |
| Sunflower Thai & Oriental Limited | Wholesale & retail | 2017 |
| Sunny Sunshine Properties Limited | Real estate | 2022 |
| Sunnyridge Agronomy Ltd | Administrative & support | 2007 |
| Sunnyside Bargains Ltd | Wholesale & retail | 2023 |
| Sunrise Chimney Sweeps Limited | Administrative & support | 2021 |
| Superclean Hand Car Wash Gosport Ltd | Administrative & support | 2026 |
| Supersam Ltd | Transport & logistics | 2016 |
| Suphawadi Ltd | Wholesale & retail | 2016 |
| Support Link Ltd | Health & social care | 2024 |
| Supreme Kutz + Ltd | Other services | 2025 |
| Surkew’S Hand Car Wash Ltd | Other services | 2025 |
| Susan's of Gosport Limited | Wholesale & retail | 2017 |
| Susan's Tavern Ltd | Hospitality | 2019 |
| Swann Properties Limited | Real estate | 2017 |
| Symbios Holdings Limited | Financial services | 2025 |
| Systemtek Limited | Professional & scientific | 1990 |
| Szarmacher Ltd | Construction | 2021 |
| T & J (Restaurant) Limited | Hospitality | 2019 |
| T and H Housing Ltd | Construction | 2026 |
| T F Venues Limited | Hospitality | 2023 |
| T Higman Ltd | Manufacturing | 2024 |
| T9 RAT Contracting Ltd | Information & communication | 2017 |
| TAI YI Health Ltd | Health & social care | 2012 |
| Tainted Love Tanning Ltd | Other services | 2020 |
| Tainted Love Tattoo Ltd | Other services | 2015 |
| Tall Ships International Limited | Arts & recreation | 2004 |
| Tall Ships Races International Limited | Arts & recreation | 2003 |
| Talland Court Limited | Real estate | 2018 |
| Tanning Extract Producers Federation Limited | Other services | 1994 |
| Tanoa Haulage Ltd | Transport & logistics | 2025 |
| Tapestry.Red Limited | Professional & scientific | 2023 |
| Taps and Tubs Limited | Wholesale & retail | 2006 |
| Tate Property Investments Ltd | Real estate | 2025 |
| Taurus Taverns Limited | Hospitality | 2023 |
| Tavmas Ltd | Health & social care | 2016 |
| Tax-Eaze Accountancy Services LP | | 2009 |
| Taxandria Limited | Wholesale & retail | 2014 |
| TBP International Limited | Transport & logistics | 2026 |
| Tbwk Ltd | Wholesale & retail | 2016 |
| Tcgjoe Ltd | Wholesale & retail | 2025 |
| TDL Commercial & Towing Ltd | Wholesale & retail | 2024 |
| Teacher Restore Limited | Information & communication | 2026 |
| Tech Sound Solutions Limited | Arts & recreation | 2026 |
| Technology Rich Limited | Information & communication | 2020 |
| Tecmach Solutions Limited | Manufacturing | 2015 |
| TED Legg Sportfishing Limited | Agriculture & fishing | 2000 |
| Teddy Grace Fareham Limited | Other services | 2022 |
| Teentalk CIC | Education | 2019 |