| RJK Sähkö Oy | Construction | 2025 |
| RK MetalWorks Oy | Manufacturing | 2021 |
| RK2 Sijoitus Oy | Real estate | 2015 |
| RKL Linjamäki Oy | Construction | 2021 |
| RKL Rancomi Oy | Construction | 2011 |
| RKL Tonico Oy | Construction | 2024 |
| RKO Kiinteistöt Oy | Real estate | 2021 |
| RL-Maalaus Oy | Other services | 2017 |
| RM-Transport Oy | Transport & logistics | 2020 |
| RMG Capital Oy | Financial services | 2025 |
| RP Asunnot Oy | Financial services | 2007 |
| RS Sport Investment and Management Oy | Financial services | 2025 |
| RST Works Oy | Manufacturing | 2021 |
| RW-Woodline Transport Oy | Transport & logistics | 2020 |
| RaHa Invest Oy | Construction | 2012 |
| Racar Oy | Wholesale & retail | 2018 |
| Radiorto Emosel Oy | Health & social care | 2016 |
| Raditel Oy | Real estate | 1998 |
| Rahile Oy | Construction | 1988 |
| Raikos Oy | Financial services | 2006 |
| Rajalle Oy | Other services | 2023 |
| Rajamäki Netmarket Oy | Wholesale & retail | 2007 |
| Rakenne Savela Oy | Professional & scientific | 2024 |
| Rakennus E. Kivelä Oy | Construction | 2016 |
| Rakennus Juha Varo Ky | Construction | 2012 |
| Rakennus K. Karhu Oy | Construction | 2001 |
| Rakennus K. Viitala Ky | Construction | 2010 |
| Rakennus Kenike Oy | Construction | 1999 |
| Rakennus Kesseli Oy | Construction | 2020 |
| Rakennus Länsimäki Oy | Construction | 2011 |
| Rakennus Ojaluoma Oy | Construction | 2014 |
| Rakennus Sahaviita Oy | Construction | 2022 |
| Rakennus Taini Oy | Construction | 2021 |
| Rakennus Vuoriot Oy | Construction | 1995 |
| Rakennus- ja Insinööritoimisto Långsjö & Launo | | 1987 |
| Rakennus- ja suunnittelutoimisto Hämäläiset Oy | Construction | 1994 |
| Rakennus-Rajala Oy | Construction | 2009 |
| Rakennushelasto Oy | Wholesale & retail | 2008 |
| Rakennusliike Ari Mänty Oy | Construction | 2008 |
| Rakennusliike Cosycon Oy | Construction | 2005 |
| Rakennusliike H Korpela Oy | Construction | 2013 |
| Rakennusliike Hämäläinen Oy | Construction | 1980 |
| Rakennusliike J. Rajala Oy | Construction | 2002 |
| Rakennusliike Jokelainen Oy | Construction | 2021 |
| Rakennusliike Juha Paavola Oy | Construction | 1969 |
| Rakennusliike KOMIA Oy | Construction | 2006 |
| Rakennusliike Koukkari & Toukonen Avoin yhtiö | Construction | 2006 |
| Rakennusliike Nyron Oy | Construction | 1999 |
| Rakennusliike Paavola - Ylinen Oy | Construction | 2000 |
| Rakennusliike Pentti Ylinen Oy | Construction | 1959 |
| Rakennusliike Peräkoski Oy | Construction | 2011 |
| Rakennusliike Timperfix Oy | Construction | 2014 |
| Rakennusliike Val-Ka Oy | Construction | 2004 |
| Rakennuspalvelu Hietala Oy | Construction | 2021 |
| Rakennuspalvelu K. Ala-Kujala Oy | Construction | 1990 |
| Rakennuspalvelu Ketola Oy | Construction | 2021 |
| Rakennuspalvelu Raimo Vuollo Oy | Construction | 2026 |
| Rakennustoimisto PRM Oy | Construction | 2021 |
| Rakennustoimisto S. Jokipii Oy | Professional & scientific | 1997 |
| Rakentajapalvelu Jokiaho Oy | Professional & scientific | 2002 |
| Rakeran Oy | Construction | 2017 |
| Rami Mäkynen Oy | Professional & scientific | 2014 |
| Ramini Oy | Hospitality | 2009 |
| Ranemix Oy | Manufacturing | 2005 |
| Ransib Enterprise Oy | Real estate | 2020 |
| Ransib Foods Corporation Oy | Hospitality | 2020 |
| Rantakoski Oy | Manufacturing | 2002 |
| Rantatrade Oy | Wholesale & retail | 2015 |
| Rapid Line Invest Oy | Financial services | 2025 |
| Rapu Software Oy | Information & communication | 2015 |
| Rasofi Oy | Administrative & support | 2015 |
| Ratantti Oy | Professional & scientific | 2007 |
| Rauhala Yhtiöt Oy | Wholesale & retail | 1992 |
| Ravalko Oy | Professional & scientific | 2012 |
| Ravenstone Capital Oy | Financial services | 2012 |
| Ravintola Juku Oy | Hospitality | 2017 |
| Ravintola Kesar Oy | Hospitality | 2025 |
| Ravintola Talli Oy | Hospitality | 2025 |
| Ravintola Verstas Oy | Hospitality | 2022 |
| Real Verkot Oy | Information & communication | 2021 |
| Real West Oy | Construction | 2018 |
| RefCap Oy | Arts & recreation | 2017 |
| Regenia Matrix Oy | Manufacturing | 2026 |
| Rehupiikles Oy | Professional & scientific | 1995 |
| Reijo Pääkkönen Oy | Financial services | 1994 |
| Reijs Oy | Construction | 2016 |
| Rengastien Autohuolto Oy | Other services | 1999 |
| Rengastien Autokiinteistö Oy | Real estate | 2008 |
| Rengastien Autotarvike Oy | Wholesale & retail | 1993 |
| Renma Barber Club Oy | Other services | 2025 |
| Renmac Oy | Real estate | 1999 |
| Renova Group Oy | Construction | 2009 |
| Renova Rakennus Oy | Construction | 2020 |
| Rent Trend Oy | Arts & recreation | 2015 |
| Rent Varastot Oy | Real estate | 2024 |
| Rentson Group Oy | Professional & scientific | 2024 |
| Resource Holding Finland Oy | Administrative & support | 2006 |
| Retromobile Oy | Wholesale & retail | 2014 |
| Rettu Clothing Oy | Wholesale & retail | 2025 |
| Reviplan Oy | Professional & scientific | 2004 |