| SPL Consultancy Limited | Professional & scientific | 2010 |
| SPL Property Management LLP | | 2009 |
| Splendidlife Stays Ltd | Hospitality | 2025 |
| Splinterz Limited | Construction | 2018 |
| Splitway Services Ltd | Construction | 2023 |
| Sportsbet Limited | Extraterritorial | 2012 |
| Sportsnation Limited | Information & communication | 2021 |
| Spot Graphics Limited | Administrative & support | 2011 |
| Spotedge Pro Ltd | Wholesale & retail | 2025 |
| Spotless Sanctuary Cleaning Services Ltd | Administrative & support | 2024 |
| Spotless Spot Cleaning Services Limited | Administrative & support | 2025 |
| Spotlight Drones Ltd | Professional & scientific | 2025 |
| Spotlight Ventures Ltd | Information & communication | 2026 |
| Spotlyt Limited | Information & communication | 2024 |
| Spotti Ltd | Professional & scientific | 2022 |
| Spray Service KJ Ltd | Construction | 2021 |
| Spray South Ltd | Construction | 2026 |
| Spraybooth Services Limited | Manufacturing | 2026 |
| Sprayglaze Limited | Construction | 2024 |
| Spreadbyte Ltd | Professional & scientific | 2018 |
| Sprigvodka Ltd | Extraterritorial | 2022 |
| Spring Corner Limited | Professional & scientific | 2011 |
| Spring Flowers Limited | Health & social care | 2025 |
| Spring Plans Ltd | Financial services | 2015 |
| Spring Road (Poole) Management Company Limited | Households | 2022 |
| Spring Sales & Consulting Ltd | Professional & scientific | 2025 |
| Spring Tide Estates Limited | Professional & scientific | 2019 |
| Springboard Worldwide Limited | Administrative & support | 1999 |
| Springbourne Stores Limited | Wholesale & retail | 2015 |
| Springer and Hurn Limited | Health & social care | 2026 |
| Springers RTM Company Limited | Households | 2023 |
| Sprinkles Parlour Ltd | Hospitality | 2024 |
| Sprint Enterprise Technology Limited | Administrative & support | 2010 |
| Sprout Business Ltd | Professional & scientific | 2024 |
| SPS Green Consulting Limited | Information & communication | 2022 |
| SPY Dog Ltd | Information & communication | 2019 |
| SPY Energy Solutions Ltd | Wholesale & retail | 2025 |
| Spyrian Limited | Administrative & support | 2021 |
| Sq-Wires Limited | Professional & scientific | 2007 |
| Square Flame Limited | Information & communication | 2013 |
| Square PEG Bureau Ltd | Professional & scientific | 2016 |
| Squior Limited | Information & communication | 2014 |
| Squirrel Self Storage Ltd | Transport & logistics | 2019 |
| Squirrels Management Company Limited(The) | Households | 1982 |
| Squishy Turtle Venues Ltd | Hospitality | 2025 |
| SR Chalk Ltd | Construction | 2022 |
| Sravan Ltd | Information & communication | 2019 |
| SRG Cars Limited | Wholesale & retail | 2012 |
| SRI Laxmi Venkateshwara Limited | Hospitality | 2025 |
| SRP Carpets & Flooring Ltd | Construction | 2023 |
| SRT Property Investments Ltd | Construction | 2026 |
| Srubex Ltd | Other services | 2024 |
| SS Cable Installation Ltd | Manufacturing | 2024 |
| Ssaa Consultancy Ltd | Information & communication | 2016 |
| Ssaa Rental Ltd | Real estate | 2021 |
| SSL Maintenance Ltd | Hospitality | 2021 |
| SSL South Limited | Wholesale & retail | 2002 |
| SSS Marketing Ltd | Wholesale & retail | 2020 |
| SSS Suppliers Limited | Wholesale & retail | 2025 |
| Ssstp Ltd | Real estate | 2024 |
| ST Accountancy & Tax Ltd | Professional & scientific | 2019 |
| ST Aldhelms RTM Company Limited | Households | 2025 |
| ST Anthony's 2 Management Ltd | Households | 1998 |
| ST Barts Finance (YBS) Ltd | Financial services | 2019 |
| ST Catherines Freehold Limited | Households | 2017 |
| ST Christophers Bournemouth Limited | Wholesale & retail | 2012 |
| ST George's Mansions (Bournemouth) Limited | Households | 1960 |
| ST Georges Court RTM Company Limited | Households | 2018 |
| ST Georges Freehold Limited | Households | 2004 |
| ST Germaine Court Freehold Limited | Real estate | 2018 |
| ST Giles (2016) Limited | Professional & scientific | 2016 |
| ST James Racing Limited | Arts & recreation | 2022 |
| ST Joseph Contractors Ltd | Construction | 2020 |
| ST Katherines Manor Management Company Limited | Households | 1987 |
| ST Kostandinos Ltd | Hospitality | 2025 |
| ST LOE Limited | Agriculture & fishing | 2012 |
| ST Mark's Church of England Primary School | Education | 2015 |
| ST Mary's Properties (Southampton) Ltd | Real estate | 2017 |
| ST Michael's Church of England Primary School | Education | 2015 |
| ST Michael's Mount Limited | Households | 2025 |
| ST Motors Garage Ltd | Wholesale & retail | 2017 |
| ST Osmunds Road Management Company Limited | Households | 2007 |
| ST Peter's Catholic Voluntary Academy Trust | Education | 2011 |
| ST Peters Lodge Limited | Households | 2016 |
| ST Peters Road Management (Bournemouth) Limited | Households | 2016 |
| ST Saviours Close Management Company Limited | Households | 1995 |
| ST Swithins House Bournemouth Freehold Limited | Real estate | 2024 |
| ST Swithun's, Bournemouth | Other services | 2014 |
| ST Winifred's Courtresidents Association(Bournemouth)Limited | Households | 1962 |
| St&M Agencies Limited | Wholesale & retail | 2024 |
| ST. Anthony's Court (1-6) Management Company Limited | Households | 2007 |
| ST. Aubyn's Court Residents (Mclean) Limited | Households | 1974 |
| ST. Brides Property Management Ltd | Households | 2025 |
| ST. Catherine's Court Management Limited | Households | 1978 |
| ST. Georges Gate Management Limited | Households | 2002 |
| ST. Georges Park Semington Limited | Households | 2001 |
| ST. Johns View & Church View Management Company Limited | Households | 2017 |
| ST. Mary's Lodge Management Company Ltd. | Households | 1993 |
| ST. Michael's 57 Management Limited | Households | 2000 |
| ST. Peter's Court Management (Parkstone) Limited | Households | 1989 |