| Sentry Care Developments Limited | Construction | 2008 |
| Sentry Care Holdings Limited | Professional & scientific | 2008 |
| Sevident Ltd | Health & social care | 2012 |
| SFK Electrical Ltd | Construction | 2019 |
| Shalcomb Street Unlimited | Financial services | 2025 |
| Sharpcut . Barbers Limited | Other services | 2026 |
| Sharrd Energy Services Ltd | Professional & scientific | 2017 |
| Shayaan Brothers Ltd | Hospitality | 2024 |
| Shelf Consultancy Limited | Professional & scientific | 2014 |
| Shemron (Construction) Ltd | Construction | 2025 |
| Shemron (Munster) Ltd | Construction | 2025 |
| Shemron Developments Ltd | Construction | 2025 |
| Shemron Homes (Christchurch) Limited | Construction | 2016 |
| Shemron Homes (Dorset) Limited | Construction | 2016 |
| Shemron Homes (Ferndown) Limited | Construction | 2016 |
| Shemron Homes (Redhill) Limited | Construction | 2019 |
| Shemron Homes Ltd | Construction | 2014 |
| Shemron Land and Planning Ltd | Construction | 2025 |
| Shoretec (UK) Ltd | Administrative & support | 2005 |
| Shourya Yash Associates Ltd | Real estate | 2021 |
| Siat Holdings Unlimited | Financial services | 2026 |
| Signature Maintenance (Dorset) Limited | Construction | 2013 |
| Silca Construction Management Limited | Construction | 2017 |
| Simon Clark Fencing Ltd | Construction | 2014 |
| Simons Court Management Company Limited | Households | 1997 |
| Sjmg Consulting Ltd | Administrative & support | 2017 |
| Sjmm Property Limited | Hospitality | 2024 |
| Skcmd Limited | Health & social care | 2022 |
| Skotrans Limited | Transport & logistics | 2013 |
| Skyline Auto Group Ltd | Wholesale & retail | 2024 |
| Slashair Limited | Other services | 2009 |
| Slepe Crescent Management Company Limited | Households | 1987 |
| Slipstream Studios Ltd | Information & communication | 2026 |
| Smart Business Projects Ltd | Other services | 2018 |
| Smart Carpentry South Limited | Construction | 2014 |
| Smart Electrical Bournemouth Limited | Construction | 2014 |
| Smart Home Property Development Ltd | Construction | 2020 |
| Smart Home Technical Ltd | Construction | 2018 |
| Smart-Ease Limited | Information & communication | 2017 |
| Smartin Developments Ltd | Construction | 2018 |
| Smartpiggyuk Ltd | Administrative & support | 2025 |
| SMS Iphone Limited | Wholesale & retail | 2019 |
| Soccer Stars Football Academy Ltd | Education | 2019 |
| Social AGE Limited | Professional & scientific | 2015 |
| SOI Property Management Limited | Real estate | 2026 |
| SOJ Fire and Security Limited | Administrative & support | 2014 |
| Solar Camper Solutions Ltd | Manufacturing | 2021 |
| Solar Graphics (GB) Limited | Manufacturing | 2003 |
| Solutions by Interact Limited | Professional & scientific | 2010 |
| Solve FX Ltd | Financial services | 2024 |
| Somerset Media Solutions Limited | Wholesale & retail | 2013 |
| South Coast Consultancy Ltd | Professional & scientific | 2024 |
| South Coast Land Society Limited | Construction | 1978 |
| South Coast Rigging Ltd | Information & communication | 2021 |
| South Coast Traffic Management Ltd | Transport & logistics | 2020 |
| South Coastal Cars Limited | Wholesale & retail | 2019 |
| South Shore Limited | Construction | 1998 |
| South West Care Group Ltd | Health & social care | 2020 |
| Southern Assets Ltd | Wholesale & retail | 2022 |
| Southern Cooling Solutions Ltd | Construction | 2008 |
| Southern Properties (Cheddar) Limited | Real estate | 1988 |
| Southern Renewable Solutions Ltd | Construction | 2025 |
| Sparking Solutions Ltd | Construction | 2006 |
| Specialist Autocare (Lindford) Ltd | Wholesale & retail | 2017 |
| Specialnutritionals.Com Ltd | Manufacturing | 2017 |
| Spice of India (Kinson) Limited | Hospitality | 2017 |
| Spice of India (Verwood) Limited | Hospitality | 2009 |
| Sprout and Grow Limited | Education | 2025 |
| SPS Fire & Security Limited | Administrative & support | 2017 |
| Squeaky Labs Ltd | Administrative & support | 2026 |
| SRS International Foods and Wines Ltd | Wholesale & retail | 2020 |
| SS Construction (Dorset) Ltd | Construction | 2019 |
| ST Barts Finance (Poole) Ltd | Real estate | 2018 |
| ST Barts Finance Limited | Administrative & support | 2009 |
| ST Catherines Launderette Limited | Other services | 2023 |
| ST Nic's Legal Services Ltd | Financial services | 2025 |
| ST Quintin Estate Agents Limited | Real estate | 2023 |
| ST. Augustins House Freehold Limited | Households | 2005 |
| ST. James Private Road Ltd | Real estate | 2023 |
| ST. Katherines Residents Association Limited | Households | 2002 |
| ST. Winifred's Management Company Limited | Households | 1986 |
| Stable Hair Limited | Other services | 2020 |
| Stag Conversions Ltd | Construction | 2022 |
| Stansted Park Garden Centre Limited | Wholesale & retail | 2018 |
| Stapehill Abbey Management Company Limited | Households | 2017 |
| Stephen Lamberth's Academy of Martial Arts Ltd | Arts & recreation | 2019 |
| Steve Pidgeon Limited | Agriculture & fishing | 2009 |
| Still & Bedford Ferndown Ltd | Health & social care | 2021 |
| Stirlings Properties Limited | Real estate | 2019 |
| Stirrup Close Freehold Limited | Households | 2000 |
| Stoll Business Services Limited | Transport & logistics | 2019 |
| Stone Catering Limited | Wholesale & retail | 2015 |
| Stove & Chimney Solutions Ltd | Construction | 2020 |
| Structural Surveys South Limited | Professional & scientific | 2024 |
| Studio 38 Microblading Ltd | Other services | 2021 |
| Style Door Systems Ltd. | Construction | 1999 |
| Style Holdings UK Ltd | Financial services | 2024 |
| Styner FM Ltd | Health & social care | 2016 |
| Suffolk Escape Room Limited | Arts & recreation | 2017 |
| Sunglow Properties Ltd | Real estate | 2024 |