| Suzy Dale Limited | Administrative & support | 2016 |
| SVM Bournemouth Limited | Hospitality | 2025 |
| SW Property Care Ltd | Construction | 2021 |
| SW1 Removals Ltd | Transport & logistics | 2025 |
| SW1 Safety Limited | Construction | 2011 |
| Swan Building Services Ltd | Construction | 2023 |
| Swanmore Property Marketing Limited | Real estate | 2019 |
| Swans Clothing Ltd | Wholesale & retail | 2023 |
| Swanside Limited | Construction | 1996 |
| Swapz.Ai Limited | Information & communication | 2026 |
| Swat Developments Ltd | Real estate | 2024 |
| Swat Engineering Ltd | Construction | 2013 |
| Swatini Brew Ltd | Hospitality | 2024 |
| Swedish Cleaners (Winton) Limited | Other services | 1979 |
| Sweet Associates Ltd | Information & communication | 2014 |
| Sweet DSR Limited | Hospitality | 2025 |
| Sweet Home to LET Ltd | Real estate | 2024 |
| Sweet to BE Fair Ltd | Professional & scientific | 2018 |
| Sweetitalian Limited | Hospitality | 2025 |
| Sweetlads Ltd | Information & communication | 2020 |
| Sweetshop Revolution C.I.C. | Arts & recreation | 2016 |
| Sweetwine Ltd | Health & social care | 2018 |
| Sweri's Ltd | Professional & scientific | 2024 |
| Swift Analytics Limited | Information & communication | 2012 |
| Swift Property Maintenance Limited | Construction | 2022 |
| Swiftdesk Limited | Administrative & support | 2025 |
| Swifthire Construction Ltd | Construction | 2025 |
| Swish Window Cleaning Services Ltd | Other services | 2017 |
| Switched on Education Ltd | Education | 2012 |
| Swlines Ltd | Information & communication | 2012 |
| Sybil House Management Limited | Households | 2005 |
| Sycamore Close Management Company Limited | Households | 1980 |
| Sycamore Mews Management Limited | Households | 2011 |
| Sycamores Management (Bournemouth) Limited | Households | 1987 |
| Sydas Limited | Professional & scientific | 2006 |
| Sydenhams Hire Centres Limited | Administrative & support | 2000 |
| Sydenhams Ltd | Wholesale & retail | 1920 |
| Sydenhams Timber Engineering Limited | Construction | 2002 |
| Sykes Property Maintenance Limited | Construction | 2010 |
| Syla Global Limited | Public administration | 2026 |
| Syla Holdings Limited | Professional & scientific | 2026 |
| Sylo Agency Ltd | Professional & scientific | 2021 |
| Sylves Mobility Care Limited | Wholesale & retail | 2017 |
| Sym'Air Limited | Professional & scientific | 2020 |
| Symac Construction Ltd | Construction | 2014 |
| Symbiosis 44 Ltd | Professional & scientific | 2023 |
| Synapsestrategy.Ai Limited | Information & communication | 2026 |
| Sync Properties Limited | Hospitality | 2025 |
| Synergi Solutions Ltd | Other services | 2025 |
| Synergis Search and Selection Limited | Administrative & support | 2003 |
| Synergis Strategic Resourcing Limited | Administrative & support | 2014 |
| Synergy LDN Limited | Administrative & support | 2017 |
| Synergy Seating Limited | Manufacturing | 2023 |
| Synprotec Limited | Manufacturing | 1997 |
| Syso Property Ltd | Real estate | 2018 |
| System & Safety Engineering Ltd | Construction | 2015 |
| Systems Change Ltd | Professional & scientific | 2025 |
| Szybki Ltd | Other services | 2026 |
| T & a Property Partners LLP | | 2026 |
| T & C Windows and Doors Ltd | Construction | 2024 |
| T and S Roofers Ltd | Construction | 2025 |
| T Curtis Limited | Construction | 2003 |
| T DOT UK Limited | Information & communication | 2014 |
| T L Property Limited | Construction | 2024 |
| T L Thompson Limited | Wholesale & retail | 2010 |
| T P Carpentry Contractors Ltd | Construction | 2012 |
| T P G Consultants Limited | Professional & scientific | 2007 |
| T R Selby Ltd | Wholesale & retail | 2025 |
| T T Housing Ltd | Real estate | 2018 |
| T W Heat Mechanical Ltd | Construction | 2025 |
| T Warwick Rentals Limited | Other services | 2019 |
| T&F Food 2011 Ltd | Wholesale & retail | 2021 |
| T&G Beauty Limited | Other services | 2019 |
| T&G Carpentry Ltd | Construction | 2025 |
| T&N Engineering Limited | Professional & scientific | 2013 |
| T.C. International Limited | Manufacturing | 1997 |
| T.E. Barbers Limited | Other services | 2026 |
| T.I. Holidays Limited | Real estate | 2022 |
| T.M.E Services Limited | Real estate | 2010 |
| T2K Holdings Ltd | Financial services | 2023 |
| T2TECH Ltd | Information & communication | 2025 |
| T3J Limited | Professional & scientific | 2015 |
| TA Hospitality Ltd | Hospitality | 2021 |
| Table Fifteen Ltd | Hospitality | 2026 |
| Tableau Consultancy Limited | Information & communication | 2023 |
| Tablethookz Limited | Manufacturing | 2016 |
| Tabletop Titans Ltd | Wholesale & retail | 2023 |
| Taboo (Bournemouth) Limited | Hospitality | 2012 |
| Tackle City Ltd | Wholesale & retail | 2025 |
| Tadama Properties Limited | Real estate | 2025 |
| TAG Consultancy UK Limited | Professional & scientific | 2017 |
| TAG Parking Limited | Hospitality | 2025 |
| Tagosi Ltd | Other services | 2018 |
| Tagus Enterprises Limited | Other services | 2017 |
| Taheri Limited | Health & social care | 2018 |
| Tail Stories Ltd | Information & communication | 2025 |
| Tailor Property Management Limited | Real estate | 2023 |
| Tailored HR Consulting Limited | Administrative & support | 2025 |
| Tailored Payroll Ltd | Professional & scientific | 2021 |
| Tailwind Nutrition Limited | Wholesale & retail | 2015 |