| Salon Seudun Sanomat Oy | Information & communication | 2014 |
| Salon Seudun Työkeskus Oy | Health & social care | 1982 |
| Salon Seudun Ympäristöhuolto Oy | Water & waste | 1992 |
| Salon Seurahuone Oy | Hospitality | 2006 |
| Salon Silmälasikeskus Oy | Wholesale & retail | 1971 |
| Salon Sisustus ja Tapetti Oy | Professional & scientific | 2013 |
| Salon Skinlab Oy | Other services | 2015 |
| Salon Sokeri Oy | Real estate | 2019 |
| Salon Spa Oy | Other services | 2021 |
| Salon Styleteam Oy | Other services | 2011 |
| Salon Sähkökonsultit Oy | Construction | 1983 |
| Salon Sähköpalvelu M. Väkiparta Ky | Construction | 1987 |
| Salon Säilyke OY | Manufacturing | 1988 |
| Salon Taloelementti Oy | Construction | 1986 |
| Salon Telttapojat Oy | Administrative & support | 2010 |
| Salon Tenniskeskus Oy | Arts & recreation | 1986 |
| Salon Teollisuuskatot Oy | Construction | 1997 |
| Salon Teollisuusmaalaus Oy | Manufacturing | 2019 |
| Salon Teollisuussähkö Oy | Construction | 1996 |
| Salon Terhinkadun Lämpökeskus Oy | Administrative & support | 1957 |
| Salon Teräskiinteistö Oy | Real estate | 2003 |
| Salon Teräslava Oy | Manufacturing | 2021 |
| Salon Thairavintola Oy | Hospitality | 2023 |
| Salon Tietotilit Ky | Professional & scientific | 1983 |
| Salon Tilausmatkat Oy | Transport & logistics | 1997 |
| Salon Tili ja Isännöinti Oy | Real estate | 1991 |
| Salon Tiliasema Oy | Professional & scientific | 1984 |
| Salon Tilipalvelu Oy | Professional & scientific | 1991 |
| Salon Torikaffe Oy | Hospitality | 2008 |
| Salon Tukituote Oy | Manufacturing | 2004 |
| Salon Ula-Taksi Oy | Transport & logistics | 1974 |
| Salon Uusi Liikennekoulu Oy | Education | 1979 |
| Salon Varastohotelli Oy | Transport & logistics | 1993 |
| Salon Varastokiinteistöt Oy | Real estate | 2012 |
| Salon Vene ja Kone Oy | Manufacturing | 1987 |
| Salon Vuokratalot Oy | Real estate | 1989 |
| Salon Värimyynti Ky | Wholesale & retail | 1982 |
| Salon XI Oy | Hospitality | 2026 |
| Salon Yksityinen Katsastus Oy | Professional & scientific | 2019 |
| Salon Yritystilit Oy | Professional & scientific | 1994 |
| Salon aluetaksi Oy | Transport & logistics | 2024 |
| Salon de Luna Oy | Other services | 2025 |
| Salon kodinelektroniikka Oy | Wholesale & retail | 2009 |
| Salon pyörä ja konehuolto Oy | Wholesale & retail | 2025 |
| Salon seudun koulutus Oy | Education | 2014 |
| Salonor Oy | Manufacturing | 1996 |
| Saloradat Oy | Arts & recreation | 2012 |
| Saloran Gym OY | Arts & recreation | 2024 |
| Saloteam Invest Oy | Real estate | 2013 |
| Saloteam Oy | Manufacturing | 2013 |
| Salotilit Oy | Professional & scientific | 1981 |
| Salovaara Myyntijohtaja Oy | Professional & scientific | 2016 |
| Saloxcom Oy | Information & communication | 2013 |
| Salpak Oy | Manufacturing | 1994 |
| Salport Oy | Wholesale & retail | 1993 |
| Samikafix Ky | Wholesale & retail | 1996 |
| Sammutinhuolto Ketonen Oy | Wholesale & retail | 2013 |
| Sanatord Oy | Professional & scientific | 2021 |
| Saneerauspalvelu Korpi Oy | Construction | 2012 |
| Saneerauspalvelu P. Korpi Oy | Construction | 1990 |
| Sangaba Oy | Transport & logistics | 2020 |
| Sappax Oy | Manufacturing | 1995 |
| Sasosi Oy | Financial services | 2024 |
| Satel Oy | Manufacturing | 1987 |
| Satopro Rakennus Oy | Construction | 2024 |
| Satora Oy | Real estate | 2019 |
| Satumaa Invest Oy | Real estate | 1989 |
| Saukkolan Hammaslääkäriasema Ky | Health & social care | 1994 |
| Scanpolymer Oy | Wholesale & retail | 1990 |
| SdiM Systems Oy | Information & communication | 2025 |
| Seaport Logistics SL Oy | Transport & logistics | 2015 |
| Second Source oy | Professional & scientific | 2009 |
| Sementtivalimo Saloranta Ky | Manufacturing | 1984 |
| SenKos Oy | Wholesale & retail | 2026 |
| Senaattori Rakentajat Oy | Construction | 2011 |
| Sensei Darts Oy | Wholesale & retail | 2024 |
| Sensoan Oy | Manufacturing | 2016 |
| Seppo Paasi Oy | Construction | 2008 |
| Sequans Communications Finland Oy | Information & communication | 2020 |
| Sevasto Group Oy | Manufacturing | 2020 |
| Show Up Oy | Information & communication | 2016 |
| Siimesvaara-Yhtiöt Oy | Real estate | 2008 |
| Siivouspalvelu Kodin Kimallus Oy | Administrative & support | 2023 |
| Siivouspalvelu Lindholm & Niemelä Avoin yhtiö | Administrative & support | 2015 |
| Sijoitusseppo Oy | Wholesale & retail | 1986 |
| SilentQuote Oy Ltd. | Administrative & support | 2007 |
| Simelius Hallit Oy | Real estate | 2006 |
| Sippura Oy | Other services | 2014 |
| Sisustus Saritta Ky | Wholesale & retail | 1989 |
| Skyline Services Oy | Real estate | 2026 |
| SmartCarrier Oy | Other services | 2025 |
| Smartelligence Oy | Professional & scientific | 2017 |
| Snic Reducr Avoin Yhtiö | Arts & recreation | 2015 |
| Snoodoo Oy | Agriculture & fishing | 2026 |
| Snow Secure Oy | Manufacturing | 2006 |
| Snusco Oy | Manufacturing | 2025 |
| So Fast Oy | Wholesale & retail | 2023 |
| Solar Finland Oy | Manufacturing | 2016 |
| Solar Finland lnvestment Oy | Manufacturing | 2019 |
| Solar Greek Investment Oy | Manufacturing | 2023 |