| Stillwaters Management Company Limited | Households | 1982 |
| Stirling Court (Bournemouth) Management Limited | Households | 1970 |
| Stirling Court Limited | Real estate | 1992 |
| Stirling High Howe Ltd | Construction | 2024 |
| Stirling Homes Ltd | Construction | 2019 |
| Stirling Place (Merley) Management Limited | Households | 2019 |
| Stirling Property Management Ltd | Real estate | 2018 |
| Stirlingham Limited | Real estate | 2024 |
| STM Direct Limited | Information & communication | 2016 |
| Stockbounty Holdings Limited | Financial services | 2020 |
| Stockbounty Ltd | Wholesale & retail | 2004 |
| Stockpots Cookshops Limited | Wholesale & retail | 2001 |
| Stockwood Court Management Company Limited | Real estate | 2002 |
| Stoke-By-Nayland Ltd | Real estate | 2025 |
| Stoman Dynamics Ltd | Information & communication | 2023 |
| Stone Hair Group Ltd | Other services | 2015 |
| Stone Interiors Limited | Construction | 2002 |
| Stone Paper Cloud Limited | Education | 2021 |
| Stonebridge Associated Colleges Limited | Education | 2000 |
| Stonefort (Dorset) Limited | Construction | 2023 |
| Stonegrade Property Limited | Construction | 2026 |
| Stonehaven (MPC 2023) LLP | | 2022 |
| Stonehaven Construction Ltd | Construction | 2022 |
| Stonehaven Holdings Limited | Professional & scientific | 2011 |
| Stonehaven Homes Ltd | Professional & scientific | 2022 |
| Stonehaven Retreats Ltd | Administrative & support | 2025 |
| Stonehenge Limited | Extraterritorial | 2003 |
| Stoneinteriordesigns Limited | Manufacturing | 2024 |
| Stoneleigh Reversion Limited | Households | 2005 |
| Stoneleigh Timber Engineering Ltd | Manufacturing | 1999 |
| Stonewood Building Company Limited | Construction | 2025 |
| Storage Here Ltd | Real estate | 2023 |
| Storage KIT Ltd | Wholesale & retail | 2022 |
| Storage Tanks Consulting Ltd | Professional & scientific | 2022 |
| Storage Today Limited | Transport & logistics | 2006 |
| Store 67 Limited | Wholesale & retail | 2026 |
| Stories for Wellbeing Ltd | Health & social care | 2024 |
| Storm Fish Limited | Extraterritorial | 2013 |
| Storms Limited Roofing.Co.Uk Ltd | Construction | 2023 |
| Stormy Networks Limited | Extraterritorial | 2016 |
| Stour Build Solutions Ltd | Construction | 2019 |
| Stour Consultancy Limited | Professional & scientific | 2019 |
| Stour Gardens Management Company Limited | Households | 2009 |
| Stour Limited | Other services | 2018 |
| Stour Mews Management Company Limited | Households | 2018 |
| Stourbanks Residents Association Limited | Households | 1974 |
| Stourcliffe 2005 Limited | Households | 2005 |
| Stourcliffe Avenue Management Limited | Real estate | 2008 |
| Stourvale Consultancy Limited | Professional & scientific | 2017 |
| Stourview Court Limited | Households | 1997 |
| Stourview Court Management Limited | Households | 1976 |
| Stourwood Grange Residents Association Limited | Real estate | 1989 |
| Stourwood House Limited | Households | 1996 |
| STQ Property Group Ltd | Real estate | 2014 |
| STR Bournemouth Ltd | Hospitality | 2015 |
| Strange Corporation Limited | Information & communication | 2000 |
| Strategic Modelling Analysis and Planning Limited | Professional & scientific | 2011 |
| Strategic Real Estate Limited | Real estate | 2016 |
| Strategic Real Estate Management Limited | Real estate | 2024 |
| Stratfield Saye (Bournemouth) Limited | Households | 1987 |
| Stratford Court (Bournemouth) Management Company Limited | Households | 2000 |
| Strathmore Court Freehold Limited | Real estate | 2024 |
| Strato Homes Property Management Limited | Construction | 2016 |
| Stratton Roofing Ltd | Construction | 2025 |
| Stratus Management Limited | Professional & scientific | 2022 |
| Strausz & Co. Ltd | Wholesale & retail | 2024 |
| Strawberry Hill Gardens Residents Management Company Limited | Households | 2023 |
| Strawberry Hire Ltd | Arts & recreation | 2018 |
| Strawberrysoup Limited | Information & communication | 2008 |
| STREAKY2KLEAN Limited | Administrative & support | 2025 |
| Stream Orchards Limited | Real estate | 2025 |
| Streamvia Limited | Information & communication | 2011 |
| Street Envy Records Ltd | Wholesale & retail | 2023 |
| Street Expressions CIC | Other services | 2025 |
| Street Groundworks and Construction Limited | Construction | 2023 |
| Strobe Bathrooms Limited | Construction | 2025 |
| Strobe Group Limited | Construction | 2016 |
| Strongco Gyms Limited | Arts & recreation | 2025 |
| Strongman Brothers Ltd | Professional & scientific | 2025 |
| Strouden Interiors Limited | Construction | 2002 |
| Strouden Leisure Services Limited | Construction | 2011 |
| Structen Limited | Extraterritorial | 2015 |
| Structural Metal Decks Limited | Construction | 1998 |
| Strudly Limited | Wholesale & retail | 2006 |
| STS Electrical Bournemouth Limited | Construction | 2022 |
| Stuart Mckeown Properties Ltd | Real estate | 2018 |
| Stuarts House Limited | Construction | 2019 |
| Studclub Ltd | Arts & recreation | 2025 |
| Studentwise Limited | Hospitality | 2009 |
| Studio 3 Beauty Limited | Other services | 2015 |
| Studio 30 Interiors Limited | Wholesale & retail | 2016 |
| Studio Glass Ltd | Information & communication | 2023 |
| Studio Parr Limited | Professional & scientific | 2014 |
| Studio Promade Limited | Hospitality | 2024 |
| Studio Somerset Ltd | Professional & scientific | 2026 |
| Studio Wood Ltd | Professional & scientific | 2013 |
| Studioeww Ltd | Professional & scientific | 2025 |
| Studiomae Ltd | Professional & scientific | 2026 |
| Studious Creative Ltd | Professional & scientific | 2019 |
| Studland Bay House Limited | Other services | 2017 |