| RDE Media Oy | Arts & recreation | 2023 |
| RK Pro Sales Ky | Wholesale & retail | 2012 |
| RMK-Palvelu Ky | Construction | 2004 |
| RTE Group Oy | Other services | 2010 |
| Rakennus ja Valvonta Martti Hämäläinen Oy | Professional & scientific | 2017 |
| Rakennusinsinööritoimisto Valakija Oy | Professional & scientific | 2021 |
| Rakennuslevy Pöyhönen Ky | Wholesale & retail | 1986 |
| Rakennuspalvelu Ahokas Oy | Construction | 2016 |
| Rakennuspalvelu Pasi Maljanen Oy | Construction | 2005 |
| Rakeron Oy | Construction | 1989 |
| Rauhamäen Metalli Oy | Manufacturing | 1986 |
| Rautamax Teräspalvelu Oy | Manufacturing | 2016 |
| Rautaneito Oy | Manufacturing | 2023 |
| Ravintola Kaks Ruusua Oy | Hospitality | 2007 |
| Ravintola Unnukanranta Ky | Hospitality | 2011 |
| Ravintola Viinamäen Rammari Oy | Hospitality | 1994 |
| Ravintolapalvelut HT oy | Hospitality | 2023 |
| Reetar Oy | Real estate | 2025 |
| Reflect Inspection Oy | Professional & scientific | 2024 |
| Rehukanava Oy | Real estate | 2005 |
| Rengas-Nyyssönen Ky | Wholesale & retail | 1982 |
| Repo-Grilli Ky | Hospitality | 1989 |
| RiPee Oy | Professional & scientific | 2022 |
| Riikinvoima Oy | Energy | 2013 |
| Ristharju OY | Real estate | 2008 |
| Riti Sijoitus Oy | Financial services | 2016 |
| Rock Your Day Capital Oy | Real estate | 2015 |
| Rodiko Oy | Construction | 2024 |
| Rokmonki Oy | Construction | 2018 |
| RollTest Measurements and Controls Oy | Manufacturing | 2015 |
| RollTest Oy | Manufacturing | 1990 |
| Roots Asset Management Oy | Professional & scientific | 2021 |
| Rossi Holding Oy | Financial services | 2011 |
| Royal FeelGood Oy | Professional & scientific | 2005 |
| Ruilin Oy | Hospitality | 2024 |
| Rukan Lepolinna Oy | Hospitality | 2005 |
| Ruokakellari Oy | Wholesale & retail | 2009 |
| Ruokariimi Oy | Wholesale & retail | 2014 |
| Ruvaslahden K-Piste Ky | | 1990 |
| Räisänen Capital Oy | Professional & scientific | 2008 |
| S & J Thil Ky | Construction | 2010 |
| SAM-Company Oy | Administrative & support | 2021 |
| SMB Rakennus Oy | Construction | 2021 |
| SME Strategies and Finance Oy | Professional & scientific | 2017 |
| SMWS Suomi Oy | Manufacturing | 2023 |
| Sn-Works OY | Manufacturing | 2020 |
| SSG Sahala Oy | Manufacturing | 2008 |
| SUPEXPEDITION Oy | Arts & recreation | 2023 |
| SaMa Urban Planning Solutions Oy | Professional & scientific | 2020 |
| Sadgirl Stories Oy | Information & communication | 2022 |
| Sahala Kiinteistöt Oy | Real estate | 2008 |
| Saiturin Mekka Oy | Wholesale & retail | 2024 |
| Samora Oy | Agriculture & fishing | 1993 |
| Sanat On Oy | Health & social care | 2016 |
| Saneeraus Ruuskanen Ky | Construction | 2017 |
| Sasu asennus ky | Construction | 2010 |
| Savon Asuntomarkkinat Oy | Real estate | 2020 |
| Savon Energiaratkaisut OY | Wholesale & retail | 2024 |
| Savon Hakepörssi OY | Agriculture & fishing | 2020 |
| Savon Kaivukumppanit Oy | Construction | 1995 |
| Savon Kolmoset Oy | Real estate | 1993 |
| Savon LVI-asennus Oy | Construction | 2006 |
| Savon Liikekeskus Oy | Real estate | 1985 |
| Savon MVR-Urakointi Oy | Construction | 2015 |
| Savon Napoli Ky | Hospitality | 2018 |
| Savon Rakennus ja asennus Ky | Construction | 2010 |
| Savon Sähkö-Center Ky | Construction | 1992 |
| Savon Sähköisku Oy | Construction | 2015 |
| Savon Talotiimi Oy | Administrative & support | 2015 |
| Savon ravintolapalvelut Oy | Hospitality | 2007 |
| Savon väyläpalvelut Oy | Construction | 2026 |
| Savopak Oy | Manufacturing | 1969 |
| Sawon Auto Oy | Wholesale & retail | 2022 |
| Sawon Tilitiimi Oy | Administrative & support | 2024 |
| Sawonia Travel Oy | Wholesale & retail | 2012 |
| Scalar Oy | Wholesale & retail | 1998 |
| ScandicBau Oy | Construction | 2023 |
| Scandinavian Factoring Oy | Financial services | 2024 |
| Scanroll Converter Oy | Construction | 2009 |
| Sematik Oy | Professional & scientific | 2020 |
| Sepon Lihatori Oy | Wholesale & retail | 1990 |
| Sermel Ky | Manufacturing | 1987 |
| Severi & Severiina Oy | Hospitality | 2009 |
| ShiftLabs Oy | Information & communication | 2025 |
| Siilin Biili Oy | Other services | 2023 |
| Siivouspalvelu Sitruuna Ky | Administrative & support | 2011 |
| Siivouspalvelu Taikahuisku Ky | Administrative & support | 2009 |
| Simo Rautio Oy | Transport & logistics | 2011 |
| Sisä-Savon Pipe & Welding Service Oy | Manufacturing | 1998 |
| SoftRain Blobs Oy | Information & communication | 2007 |
| Soinyr Oy | Real estate | 2003 |
| Soisalon Eläinklinikka Oy | Professional & scientific | 2012 |
| Soisalon Liikenne Oy | Transport & logistics | 1995 |
| Solves oy | Construction | 2020 |
| Somantina Oy | Wholesale & retail | 2017 |
| Sonderwagen OY | Manufacturing | 2024 |
| Sporttikojootti Ky | Wholesale & retail | 1997 |
| StaffMill Oy | Administrative & support | 2016 |
| Stella Maria Oy | Construction | 2019 |
| Subsea Infra Oy | Construction | 2025 |