| Rantosen Ratas Oy | Wholesale & retail | 2018 |
| Rantsilan Mekamet Oy | Manufacturing | 1992 |
| Rautalammin Sähkö Oy | Real estate | 1989 |
| Rautaosa Iisalmi Oy | Wholesale & retail | 2008 |
| Ravintola Amir Oy | Hospitality | 2024 |
| Ravintola LBV Oy | Hospitality | 1998 |
| Ravintolapalvelut Parviainen Avoin yhtiö | Hospitality | 2015 |
| Re-Quip Oy | Wholesale & retail | 2020 |
| Refix Oy | Other services | 1994 |
| Reippaat Puuhastelijat Oy | Administrative & support | 2022 |
| Repo Invest Oy | Administrative & support | 2002 |
| Repo Kaivu Oy | Construction | 2013 |
| Riggtech Finland Oy | Construction | 2012 |
| Rinne Invest Oy | Wholesale & retail | 1988 |
| Ristimännät Oy | Real estate | 2026 |
| Rockville Oy | Professional & scientific | 1976 |
| Runnirock Finland Oy | Arts & recreation | 2015 |
| Ruotsalainen Trucking Oy | Transport & logistics | 2012 |
| Ruska Capital oy | Financial services | 2021 |
| Rutakon Rakennus Oy | Construction | 2016 |
| Ruukin Neuvola Oy | Hospitality | 2018 |
| Ruula Oy | Construction | 1993 |
| Ryhmis Päivänhelmi avoin yhtiö | Education | 2016 |
| Rytkönen & Ahonen Oy | Real estate | 1977 |
| S.J. Toivonen Oy | Transport & logistics | 1996 |
| SAE Partners Oy | Wholesale & retail | 2022 |
| SAROFit Oy | Arts & recreation | 2025 |
| SET-mainos Ky Heiskanen | Manufacturing | 1988 |
| SK-Lasi Oy | Construction | 2008 |
| SL-Trans Oy | Transport & logistics | 2003 |
| So May Ky | Administrative & support | 2011 |
| STRI-Consulting Oy | Professional & scientific | 2023 |
| SaMaKo Ky | Administrative & support | 2018 |
| Saarivainio Oy | Real estate | 1985 |
| Safecare Oy | Administrative & support | 2009 |
| Sahlström Group Oy | Financial services | 2024 |
| Sallisen ABC Oy | Information & communication | 1984 |
| Salmelan Monitoimi Oy | Construction | 1995 |
| Salmi Forest Oy | Transport & logistics | 2016 |
| Samaratak Oy | Manufacturing | 2021 |
| Samura liikunta- ja turvallisuuspalvelut Oy | Administrative & support | 2009 |
| Saniplan Oy | Professional & scientific | 2013 |
| Sanna Vuorialho Ky | Wholesale & retail | 2021 |
| Sanna Ylisipola Oy | Other services | 2024 |
| Satuniemen Kiinteistöt Oy | Real estate | 2020 |
| Saunalahden vesiosuuskunta | Water & waste | 2006 |
| Savo kiinteistöt MJJ Oy | Real estate | 2020 |
| SavoKraft Oy | Information & communication | 2026 |
| Savon ICT-palvelut Oy | Information & communication | 2011 |
| Savon LVI-Expert Oy | Construction | 2011 |
| Savon Laaturakennus Oy | Construction | 2002 |
| Savon Lasituote Oy | Construction | 2008 |
| Savon OPM Kaluste Invest Oy | Wholesale & retail | 2018 |
| Savon Pro Service Oy | Wholesale & retail | 2000 |
| Savon Putkityö Oy | Construction | 2008 |
| Savon Rautaosa Oy | Wholesale & retail | 2013 |
| Savon Salsaviihde avoin yhtiö | Education | 1999 |
| Savon Siemen Oy | Wholesale & retail | 1996 |
| Savon Turistiauto Oy | Transport & logistics | 1966 |
| SawoCare Oy | Health & social care | 2019 |
| Sawon Fixaus Oy | Other services | 2023 |
| Sciare Ky | Wholesale & retail | 1985 |
| Seita-Maaria Oy | Professional & scientific | 2007 |
| Serenepalvelu Oy | Wholesale & retail | 1998 |
| Sereno Oy | Health & social care | 2026 |
| Shop Huitsin Nevada Oy | Wholesale & retail | 2000 |
| Shvets Oy | Hospitality | 2022 |
| Sifroll Oy | Construction | 2010 |
| Siivouspalvelu Särkelä Itte Avoin yhtiö | Administrative & support | 2018 |
| Silvetto Oy | Wholesale & retail | 2024 |
| Simply asbest Oy | Water & waste | 2022 |
| Sirviön Metalli Oy | Manufacturing | 2003 |
| Sisanna Oy | Construction | 2023 |
| Sisuline Oy | Manufacturing | 2014 |
| Ski-Kocero Ky | Arts & recreation | 1992 |
| Skolleri Oy | Professional & scientific | 1995 |
| Sm-Group Oy | Professional & scientific | 1983 |
| Smile Monkey Commerce Oy | Wholesale & retail | 2023 |
| Smokeman Oy | Professional & scientific | 2025 |
| Soinjoen vesiosuuskunta | Water & waste | 1990 |
| Solarco Oy | Construction | 2022 |
| Solluna Oy | Hospitality | 2018 |
| Sourunsalon Kauppa avoin yhtiö | Wholesale & retail | 1964 |
| Sportivo Oy | Arts & recreation | 2017 |
| Sporttiimi Oy | Arts & recreation | 2009 |
| Stall Nikkanen Oy | Professional & scientific | 1998 |
| Steelko Oy | Manufacturing | 2021 |
| Stelexon Oy | Financial services | 2003 |
| Suokylän vesiosuuskunta | Water & waste | 1989 |
| Suomen Ajoneuvotekniikka Oy | Wholesale & retail | 2019 |
| Suomen Metsäsijoitus Oy | Agriculture & fishing | 1988 |
| Suomen Oluset Oy | Administrative & support | 1996 |
| Suomen lähiradiot Oy | Information & communication | 2012 |
| Suomivalimo Oy | Manufacturing | 2016 |
| Susirajan Kontrolli Oy | Professional & scientific | 2017 |
| Sykledom Oy | Manufacturing | 2021 |
| SähköRami Oy | Construction | 2012 |
| Sähkötoimisto Murtola Oy | Construction | 2017 |
| Säästöpankki Optia Oy | Financial services | 2024 |
| T-Barbeque Smoker Oy | Hospitality | 2016 |