| Rautalammin Matkailu Ky | Hospitality | 1994 |
| Rautalammin Metsäenergia Ky | Agriculture & fishing | 2004 |
| Rautalammin Metsäkonemiehet Oy | Manufacturing | 1995 |
| Rautalammin Pienkonekorjaamo Oy | Other services | 2013 |
| Rautalammin Pinta Oy | Manufacturing | 2019 |
| Rautalammin RKH Oy | Other services | 2023 |
| Rautalammin Rinnemajat Ky | Hospitality | 1990 |
| Rautalammin Turkis Oy | Real estate | 1979 |
| Rautalammin kunnan Asunnonhankinta Oy | Real estate | 1993 |
| Ravintola Serafi Oy | Hospitality | 2015 |
| Restafun Oy | Hospitality | 1993 |
| Romuharju Oy | Water & waste | 2017 |
| Saahkari Mills Oy | Professional & scientific | 2015 |
| Saahkarin Kone Ky | Construction | 2001 |
| Saarenkartanon Lääkäriklinikka ja Terveyshoitola Oy | Health & social care | 1989 |
| Sahala Herbs Oy | Manufacturing | 2019 |
| Sami Hildén Ky | Wholesale & retail | 2024 |
| Savo Lax Oy | Agriculture & fishing | 2009 |
| Savolux Ky | Administrative & support | 2010 |
| Savon Marja Oy | Wholesale & retail | 2018 |
| Savon Portti - Lohikeidas Ky | Hospitality | 1987 |
| Savon Taimen -tuotanto Oy | Agriculture & fishing | 2012 |
| Savon Turvetyö Oy | Mining & quarrying | 1995 |
| Senioriosaajat Ky | Administrative & support | 2010 |
| Sepon Kaluste Oy | Wholesale & retail | 1962 |
| Sijoitusomena Oy | Professional & scientific | 1989 |
| Sisä-Savon Nuohouspalvelu Oy | Administrative & support | 2011 |
| Sisä-Savon Tilataksi Oy | Transport & logistics | 1993 |
| Soikkuri Consulting Oy | Professional & scientific | 2007 |
| Studio Käpynä Oy | Professional & scientific | 2024 |
| Suomen Kaapelikaivu ja Suuntaporaus SKKS Oy | Real estate | 2020 |
| SurviveJS Oy | Information & communication | 2016 |
| Susanna Sundvall Oy | Other services | 2024 |
| TERÄMEKA Ky | Manufacturing | 2007 |
| TKAH Oy | Construction | 2023 |
| Team-Steel Oy | Manufacturing | 2005 |
| The FIN Salon Oy | Other services | 2021 |
| Tietävä Oy | Real estate | 2023 |
| Timoforest Oy | Agriculture & fishing | 2016 |
| Trans Kuljari Ky | Transport & logistics | 1997 |
| Tyyni Hoiva Suomi Oy | Health & social care | 2024 |
| Tyyrinvirran Kiinteistö Oy | Real estate | 1981 |
| Törmälän loma- ja kurssikeskus Oy | Arts & recreation | 2002 |
| VeikkaTech Oy | Water & waste | 2026 |
| Veljekset Kosunen | Agriculture & fishing | 1986 |
| Vesakonraivaus Manninen Oy | Construction | 2000 |
| Vet House Lapua Oy | Professional & scientific | 2020 |
| Virrankylän Lämpö- ja Kasvuturve Oy | Mining & quarrying | 2003 |
| Vita Workforce Agency Oy | Administrative & support | 2017 |
| Willmar Oy | Health & social care | 1993 |
| Yrjö Karasola Ky | Hospitality | 1996 |
| iTaxi Services Oy | Transport & logistics | 2021 |