| Questa North Station Oy | Real estate | 2003 |
| R.R. Kainulainen Oy | Transport & logistics | 2001 |
| Rastock OY | Wholesale & retail | 2021 |
| RH varainhallinta Oy | Administrative & support | 2013 |
| Riviera Service OY | Wholesale & retail | 2013 |
| RMH Asennus Oy | Other services | 2025 |
| RP-Trade Oy | Real estate | 2008 |
| RT-Tuote Oy | Manufacturing | 2020 |
| Racing support by J.M.T. Oy | Arts & recreation | 2026 |
| RajaJousi Oy | Wholesale & retail | 2011 |
| Rajapatsaan Autohuolto Oy | Other services | 1988 |
| RakLamit Oy | Professional & scientific | 2013 |
| Rakennus Rönty Oy | Construction | 2023 |
| Rakennusliike Evälahti Oy | Construction | 1955 |
| Rakennusliike Evälahti Uusimaa Oy | Construction | 2010 |
| Rakennusliike J. Kontio Ky | Construction | 1984 |
| Rakennusliike Jari Nousiainen Ky | Construction | 1976 |
| Rakennusliike Kaski Oy | Construction | 1995 |
| Rakennusliike Saunakangas Oy | Construction | 2018 |
| Rakennusliike Sulo Lipsanen Oy | Real estate | 1990 |
| Rakennusosakeyhtiö Saima | Construction | 2020 |
| Rakennuspalvelu Liisi ja Heikki Heino Oy | Construction | 1976 |
| Rakennuspalvelu Ronski Oy | Construction | 2009 |
| Rakennussuunnittelu Ovaska Oy | Professional & scientific | 2012 |
| Rakennustoimisto Matti Toikka Oy | Professional & scientific | 2014 |
| Rakennustoimisto Propetri Oy | Real estate | 2006 |
| Rakennustyöt Imatra Oy | Construction | 2017 |
| Rakennusvirta Group Oy | Construction | 2007 |
| Rakennusvirta Oy Imatra | Construction | 2018 |
| Rakennuttajatoimisto Projektikonsultit Oy | Manufacturing | 2023 |
| Raksakarhu Oy | Construction | 2021 |
| Rantakalliolla Oy | Arts & recreation | 2021 |
| Rantalaisen Monitoimi Oy | Other services | 1997 |
| Ratarahti Oy | Transport & logistics | 2009 |
| Ratarinki Oy | Transport & logistics | 2009 |
| Rateco Ky | Construction | 2006 |
| Ratecom Ltd Oy | Construction | 2020 |
| Rautio Bee Ky | Manufacturing | 1986 |
| Ravintola Euro BG Ky | Hospitality | 2012 |
| Ravintola Kolme Härkää Oy | Hospitality | 1999 |
| Ravintola Mocambo Ky | Hospitality | 1981 |
| Ravintola Xiangfu Avoin yhtiö | Hospitality | 2003 |
| RePlay Sports Oy | Wholesale & retail | 2024 |
| Reetta Tuuha Oy | Hospitality | 2024 |
| Refractory & Powertech Oy | Professional & scientific | 2018 |
| Reike Oy | Manufacturing | 1987 |
| Relion Oy | Administrative & support | 2018 |
| Rent ja Kalusto Oy | Transport & logistics | 1998 |
| RentoLaituri Oy | Manufacturing | 2025 |
| Repair Wizards Oy | Other services | 2020 |
| Rimpex Oy | Wholesale & retail | 1988 |
| RiverSmile Oy | Hospitality | 2013 |
| Riverside Prods Oy | Wholesale & retail | 2016 |
| Rohteekki Oy | Wholesale & retail | 2024 |
| Roll Bowling Oy | Arts & recreation | 2023 |
| Rubidium Oy | Financial services | 1994 |
| RumbleTools Oy | Manufacturing | 2016 |
| Ruokolahden Bussipalvelu Ky | Transport & logistics | 2001 |
| Rämö Oy | Manufacturing | 1977 |
| S & K Company Oy | Hospitality | 2023 |
| S & R Company Oy | Hospitality | 2026 |
| SCT Events Oy | Arts & recreation | 2020 |
| SE-Korjaamo Oy | Other services | 2026 |
| SHT-Kiinteistöt Oy | Real estate | 2006 |
| Sufi OY | Transport & logistics | 2014 |
| SV Intec Oy | Other services | 2012 |
| Saara Kirjavainen Ky | | 1989 |
| Saari Service Ky | Construction | 2013 |
| Sahamesta Oy | Manufacturing | 1990 |
| Saimaa Hills Oy | Administrative & support | 2025 |
| Saimaa Luck Oy | Wholesale & retail | 2019 |
| Saimaa Seasons Oy | Hospitality | 2020 |
| Saimaa Seven Oy | Hospitality | 2018 |
| Saimaa Style Oy | Hospitality | 2017 |
| Saimaa Yngwie Oy | Professional & scientific | 2018 |
| SaimaaSport Oy | Wholesale & retail | 2010 |
| Saimaan Arita kiinteistöt Oy | Real estate | 2009 |
| Saimaan Consultant Oy | Administrative & support | 2012 |
| Saimaan Erikoispalvelut Oy | Administrative & support | 2015 |
| Saimaan Huoltoteam Oy | Construction | 1993 |
| Saimaan Kate ja Rakennus Oy | Construction | 2007 |
| Saimaan Kotifysioterapia Oy | Health & social care | 2025 |
| Saimaan Lasipalvelu Oy | Construction | 2020 |
| Saimaan Laskenta Oy | Professional & scientific | 2014 |
| Saimaan Rakennus- ja Kuljetuspalvelu Oy | Construction | 2005 |
| Saimaan Siivouspalvelu Oy | Administrative & support | 2025 |
| Saimaan Sukelluspalvelu Oy | Construction | 1991 |
| Saimaan Sähkösuunnittelu Oy | Wholesale & retail | 1998 |
| Saimaan Tilintarkastus Oy | Professional & scientific | 2012 |
| Saimaan Uusioteräs Oy | Wholesale & retail | 2002 |
| Saimaan Vuoksi Oy | Real estate | 2007 |
| SaimaanKeskus Oy | Hospitality | 2016 |
| Saimaatrast Oy | Hospitality | 2012 |
| Salon Paradise Ky | Other services | 1987 |
| Salute Solutions Oy | Information & communication | 2019 |
| Samina-Foto Ky | Professional & scientific | 1999 |
| Sammonsahti Oy | Hospitality | 2021 |
| Saneeraus ja maalaus Purujoki Oy | Construction | 1987 |
| Satakieli Holding Oy | Administrative & support | 2020 |
| Saunalaiva Emma Avoin Yhtiö | Transport & logistics | 2023 |