| ST. Virgin Mary Ltd | Real estate | 2020 |
| St.James's Court(Boscombe)Limited | Households | 1969 |
| St.Margarets Flat Management(Bournemouth)Limited | Households | 1971 |
| Stables Car Storage Ltd | Other services | 2019 |
| Stacey Joy Properties Limited | Real estate | 2019 |
| Staff 2000 Professional Limited | Administrative & support | 2016 |
| Staff 2000 Recruitment Ltd | Administrative & support | 2015 |
| Staff Nexus Ltd | Information & communication | 2026 |
| Staff Stream Ltd | Administrative & support | 2024 |
| Staffed UP Limited | Administrative & support | 2020 |
| Staffonic Ltd | Professional & scientific | 2019 |
| Stafford Lodge Alum Chine Ltd | Real estate | 2011 |
| Stag Construction Limited | Construction | 2020 |
| Stag Industries Ltd | Wholesale & retail | 2025 |
| Stags Head Antiques Limited | Wholesale & retail | 2011 |
| Stainer Associates Limited | Professional & scientific | 2024 |
| Stainless & Steel Systems Ltd | Construction | 2021 |
| Stalan Ltd | Transport & logistics | 2024 |
| Stallion Construction Ltd | Construction | 2019 |
| Stallion Management Ltd | Real estate | 2022 |
| Stamfordhomeimprovements Ltd | Construction | 2025 |
| Stami Studios Ltd | Wholesale & retail | 2018 |
| Stand OUT Print Ltd | Manufacturing | 2019 |
| Standard V Ltd | Professional & scientific | 2025 |
| Stanley Court Residents Limited | Households | 2011 |
| Stanmore Court Management Company Limited | Households | 2021 |
| Stanzubby Enterprises Ltd | Administrative & support | 2024 |
| Star Central Market Ltd | Wholesale & retail | 2026 |
| Star Cloud Solutions Limited | Information & communication | 2022 |
| Star Soccer Supplies Ltd | Wholesale & retail | 2014 |
| Starbright Holdings Ltd | Real estate | 2022 |
| Stardust Family Group Limited | Wholesale & retail | 2022 |
| Stardust Family Real Estate Limited | Real estate | 2024 |
| Stargaze Holdings Ltd | Wholesale & retail | 2021 |
| Stargazer Studios Limited | Information & communication | 2024 |
| Starling Services Ltd | Health & social care | 2023 |
| Starlinks Limited | Health & social care | 2009 |
| Starmusik Limited | Arts & recreation | 2022 |
| Stars Barber Ltd | Other services | 2025 |
| Stars Corporate Limited | Education | 2022 |
| Stars FC | Education | 2025 |
| Starshift Ltd | Wholesale & retail | 2021 |
| Starwell Limited | Information & communication | 2025 |
| State of the Art Entertainment Ltd | Information & communication | 2020 |
| Static Caravan Services Ltd | Other services | 2007 |
| Station Court (Wimborne) Limited | Real estate | 1993 |
| Station Road Antiques Ltd | Real estate | 2024 |
| Status Developments Ltd | Construction | 2023 |
| Staunton Management Limited | Households | 1984 |
| Stay Connected Media Ltd | Professional & scientific | 2022 |
| Stay Unity Manager Ltd | Information & communication | 2025 |
| STAY&PLAY4PAWS Ltd | Other services | 2026 |
| Staycation Lodges Limited | Hospitality | 2016 |
| Stclements PRE School Ltd | Education | 2019 |
| Steady State Growth Limited | Professional & scientific | 2023 |
| Stealth Spring Security Ltd | Administrative & support | 2024 |
| Steam Consulting and Training Limited | Professional & scientific | 2024 |
| Steamship Circus Ltd. | Manufacturing | 2015 |
| Steamship Youth Circus CIC | Arts & recreation | 2022 |
| Steamsmiths Limited | Administrative & support | 2020 |
| Steel Resolution Ltd | Professional & scientific | 2022 |
| Steel Solutions South West Ltd | Construction | 2017 |
| Steele Raymond LLP | | 2005 |
| Steele Raymond Trust Corporation Limited | Other services | 2024 |
| Steelray Nominees Limited | Professional & scientific | 1990 |
| Steelray Secretarial Services Limited | Professional & scientific | 1990 |
| Stef C4 Ltd | Construction | 2023 |
| Stefan Automotive Limited | Information & communication | 2022 |
| Stella International Ltd | Professional & scientific | 2016 |
| Stemventures Ltd | Education | 2024 |
| Step UP Consulting Services Limited | Professional & scientific | 2007 |
| STEP4WARD Limited | Health & social care | 2010 |
| Stephan Limited | Hospitality | 2012 |
| Stephen Bowater Limited | Construction | 2014 |
| Stephen David Russell Consulting Services Limited | Information & communication | 2025 |
| Stephen Hill Hairdressers Limited | Other services | 1978 |
| Stephen Penny and Partners Limited | Professional & scientific | 1997 |
| Stephen's Pharmaclinic and Healthcare Services Limited | Health & social care | 2024 |
| Stepio Ltd | Professional & scientific | 2023 |
| Sterling Developments (Dorset) Ltd | Construction | 2022 |
| Sterling Housing ST Eval Limited | Real estate | 2013 |
| Sterling Investments (Bournemouth) Limited | Real estate | 2013 |
| Sterling Marine Services Ltd | Other services | 2019 |
| Steve Bateman Superbike Wholesale Limited | Wholesale & retail | 2002 |
| Steve Bernard Foundation | Arts & recreation | 2006 |
| Steve Davies Homes Limited | Construction | 2003 |
| Steve Madden Data Comms Ltd | Information & communication | 2012 |
| Steve Norton Construction Limited | Construction | 2017 |
| Steve Watson Flooring Ltd | Construction | 2024 |
| Stewart & Co LLP | | 2005 |
| Stewarts & Sons Ltd | Financial services | 2023 |
| Stewarts Estates Block Management Ltd | Households | 2025 |
| Stewarts Estates Holdings Ltd | Financial services | 2023 |
| Stewarts Estates Ltd | Real estate | 2011 |
| Stewartsproperty Ltd | Real estate | 2020 |
| Stich Technologies Limited | Wholesale & retail | 2022 |
| Sticky Glue Ltd | Wholesale & retail | 2023 |
| Stiff Culture Limited | Wholesale & retail | 2026 |
| Still Waters Capital Ltd | Financial services | 2017 |
| Stilleben Limited | Real estate | 2020 |