| Sandford House (Mudeford) Limited | Households | 2005 |
| Sandown House Freehold Ltd | Households | 2022 |
| Sands Reach Limited | Hospitality | 2016 |
| Sarah Dawn Ltd | Professional & scientific | 2024 |
| Sargasso Worldwide Industrial Limited | Wholesale & retail | 2011 |
| Sato Enterprises Limited | Administrative & support | 2004 |
| Saulfland Place (Freehold) Ltd. | Real estate | 2020 |
| Saulfland Place Management Co. Limited | Households | 1981 |
| Saxon Bar Limited | Hospitality | 2017 |
| Saxon Seats Limited | Wholesale & retail | 2009 |
| Saysh Sailing Limited | Other services | 2024 |
| SCA Clinic Limited | Extraterritorial | 2016 |
| Scaffold Designers Ltd | Professional & scientific | 2016 |
| Scale Warship Limited | Wholesale & retail | 2011 |
| Scampton House Management Company Limited | Households | 2020 |
| Scanmaster Asset Inspections Limited | Administrative & support | 2015 |
| Scarlet Oak Electrical Ltd | Construction | 2025 |
| Schofield Electrical Services Ltd | Construction | 2025 |
| Schuberth KSE Ltd | Administrative & support | 2010 |
| Scope Logics Limited | Wholesale & retail | 2020 |
| SD Podiatry Ltd | Health & social care | 2019 |
| Sdps Electronics Limited | Professional & scientific | 2011 |
| SDS Archive Manager Limited | Administrative & support | 2015 |
| SDS Bureau Services Ltd | Information & communication | 2024 |
| SDS Enterprise Services Limited | Information & communication | 2016 |
| SDS Information Assets Heritage Ltd | Information & communication | 2015 |
| SDS Information Assets Limited | Education | 2011 |
| SDS O&M Limited | Education | 2014 |
| Seafield (Bournemouth) Limited | Real estate | 2011 |
| Seaford Property Management Company Limited | Real estate | 2001 |
| Seafresh Seafoods Limited | Wholesale & retail | 1998 |
| Sealed Limited | Wholesale & retail | 2021 |
| Seaside Escapes Limited | Hospitality | 2024 |
| Seastay Records Limited | Information & communication | 2020 |
| Seaton Homes & Developments Ltd | Real estate | 2007 |
| Seaview Carpentry and Developments Ltd | Construction | 2019 |
| Secret Agent Services Limited | Administrative & support | 2016 |
| Securelec Security Systems Ltd | Construction | 2014 |
| Selfsown Ltd. | Professional & scientific | 2009 |
| Sempura Ltd | Professional & scientific | 2021 |
| Senamoka Ltd | Other services | 2022 |
| Servicesolve Limited | Administrative & support | 2012 |
| Seshdesk Ltd | Information & communication | 2026 |
| Seventides Ltd | Hospitality | 2024 |
| Seventy Two Blue Ltd | Real estate | 2017 |
| SFJ Property Limited | Real estate | 2010 |
| Shahid & Sons Ltd | Financial services | 2026 |
| Shahid’S Restaurant Ltd | Hospitality | 2026 |
| Shams Digital Marketing Limited | Information & communication | 2022 |
| Shanahan Podiatry Ltd | Health & social care | 2017 |
| Shaunb Construction Ltd | Construction | 2019 |
| Shaw Golf Ltd | Wholesale & retail | 2020 |
| Shed VFX Ltd | Information & communication | 2017 |
| Shell Education Ltd | Education | 2022 |
| Shelley Hamlets Limited | Households | 2003 |
| Shelley Theatre Company Limited | Wholesale & retail | 2006 |
| Shelley Theatre Trust | Arts & recreation | 2014 |
| Shepherd Photography Ltd | Professional & scientific | 2016 |
| Sherborne Court (Boscombe) Limited | Households | 1998 |
| Shimroon Limited | Wholesale & retail | 2002 |
| Shine + Aesthetics Limited | Health & social care | 2026 |
| Shineford Flat Management Limited | Hospitality | 1991 |
| Shirestone Capital Limited | Real estate | 2024 |
| SIA Group Limited | Real estate | 2026 |
| Sielo Search Limited | Administrative & support | 2025 |
| Signatures Ltd | Information & communication | 1996 |
| Signpost HR Solutions Ltd | Professional & scientific | 2010 |
| Signs of Distinction Limited | Other services | 1997 |
| Silda Limited | Wholesale & retail | 2017 |
| Silver Boats UK Ltd | Wholesale & retail | 2017 |
| Silver Business Park (Management) Limited | Households | 1990 |
| Silver Hellas Ltd | Health & social care | 2018 |
| Silverstar Computing Limited | Information & communication | 1999 |
| Simcast Dental Laboratories Limited | Health & social care | 2009 |
| Simdoc Solutions Limited | Manufacturing | 2007 |
| Simkap (Childcare) Limited | Health & social care | 2018 |
| Simkap (Properties) Limited | Real estate | 2022 |
| Simkap Consultants Ltd | Administrative & support | 2008 |
| Simmtech Consultancy Ltd | Information & communication | 2016 |
| Simon Dufton Aviation Ltd | Education | 2024 |
| Simple Sales Direct Ltd | Wholesale & retail | 2025 |
| Simple Tax Solutions Limited | Professional & scientific | 2009 |
| Simplementary Limited | Administrative & support | 2012 |
| Simples Servings Ltd | Hospitality | 2022 |
| Sisters of Stoke Ltd | Education | 2025 |
| SJ Graphics Ltd | Professional & scientific | 2023 |
| SJC Elite Limited | Hospitality | 2018 |
| SJC Prop Limited | Real estate | 2021 |
| SJM Vehicles Ltd | Wholesale & retail | 2022 |
| SJO Creative Limited | Professional & scientific | 2025 |
| SJR Cooke Limited | Professional & scientific | 2019 |
| SJS Projects Limited | Construction | 2018 |
| SK Fire Solutions Ltd | Public administration | 2019 |
| Sketch to Cloud Ltd | Information & communication | 2019 |
| Skin by Ella Ltd | Other services | 2026 |
| Skinace Limited | Health & social care | 2024 |
| Skyward Projects Ltd. | Professional & scientific | 2018 |
| SL123 Ltd | Information & communication | 2013 |
| Slade Towertech Limited | Professional & scientific | 2011 |
| Slades (Christchurch) Ltd | Real estate | 2016 |