| Rakennuspalvelu Kokko Group Oy | Construction | 2021 |
| Rakennuspalvelu Kokko Oy | Construction | 2009 |
| Rakennuspalvelu Kreivi Oy | Construction | 2022 |
| Rakennuspalvelu L Tolonen Oy | Construction | 1989 |
| Rakennuspalvelu Pekka A Ky | Construction | 2012 |
| Rakennuspalvelu Perälä Oy | Construction | 2020 |
| Rakennuspalvelu Pooki Oy | Construction | 2025 |
| Rakennuspalvelu Rajaduo Oy | Construction | 2021 |
| Rakennuspalvelu Rauno Uhlgren Oy | Construction | 2017 |
| Rakennuspalvelu Remppaasi Oy | Construction | 2020 |
| Rakennuspalvelu VaNa Oy | Construction | 2026 |
| Rakennuspalvelu Wilima Oy | Construction | 2021 |
| Rakennusrestaurointi Restent Oy | Construction | 2011 |
| Rakennussiivous Teho-TH Oy | Construction | 2022 |
| Rakennusteho Group Oy | Construction | 2005 |
| Rakennusteho Oy | Construction | 1994 |
| Rakennustoimisto A & L Laakso Oy | Construction | 1991 |
| Rakennustukku Finland Oy | Wholesale & retail | 2012 |
| Rakennustyö J. Kokko Oy | Construction | 2021 |
| Rakennuttajatoimisto Promen Oy | Real estate | 2013 |
| Rakennuttaminen ja valvontapalvelu Ryyppö oy | Real estate | 2025 |
| Rakinsto Huhta Oy | Construction | 2021 |
| Rakiratamo Oy | Construction | 1987 |
| Rakka Consulting Oy | Real estate | 2026 |
| Rakka Holding Oy | Real estate | 2026 |
| Rakkarikööri Oy | Professional & scientific | 2021 |
| Rakmove Oy | Construction | 2015 |
| Raksa-Pekka Oy | Construction | 2021 |
| Raksau Oy | Administrative & support | 2014 |
| Raksilan Dent-Fys Oy | Health & social care | 1991 |
| Raksilan Likat Oy | Arts & recreation | 2025 |
| Raksilan Paikoitus Oy | Transport & logistics | 1975 |
| Ramaster Oy | Professional & scientific | 2003 |
| RamuCo Oy | Information & communication | 2018 |
| Rancap Oy | Professional & scientific | 1993 |
| Randax Oy | Manufacturing | 2006 |
| Rando Grid Oy | Energy | 2024 |
| Rane Medical Oy | Health & social care | 2025 |
| Rannikon Suojakate Ky | Construction | 1990 |
| RantaKoira Oy | Information & communication | 2024 |
| Rantakari Consulting Oy | Professional & scientific | 2026 |
| Rantakoivunoksa Ky | Hospitality | 1992 |
| Rante Oy | Professional & scientific | 2008 |
| Rapico avoin yhtiö | Manufacturing | 2004 |
| Rapid River Ky | Information & communication | 1991 |
| Raptor Consulting Oy | Professional & scientific | 2023 |
| RataValve Oy | Professional & scientific | 2021 |
| Ratax Oy | Other services | 2026 |
| Ratiisi Oy | Real estate | 1996 |
| RatsArtsi Ky | Arts & recreation | 1984 |
| RauLaw Oy | Professional & scientific | 2023 |
| Rauhala Company Oy | Real estate | 2024 |
| Rauma Holding Oy | Financial services | 2016 |
| Rauta-Pajala Oy | Wholesale & retail | 2021 |
| Rautagroup Oy | Administrative & support | 2022 |
| Rautahöyhen oy | Professional & scientific | 2018 |
| Rautajyra Oy | Wholesale & retail | 2013 |
| Rautio & Kumppanit Oy | Professional & scientific | 2011 |
| Rave Rakennus Oy | Construction | 2002 |
| Ravintola Alfred Oy | Hospitality | 2023 |
| Ravintola BQoulu Oy | Hospitality | 2022 |
| Ravintola Baabel Oy | Hospitality | 2025 |
| Ravintola Cafe Snellman ja Snellman | | 1992 |
| Ravintola HS Oy | Hospitality | 2021 |
| Ravintola Lohikäärme avoin yhtiö | Hospitality | 2005 |
| Ravintola Luka Oy | Hospitality | 2025 |
| Ravintola Meso oy | Hospitality | 2021 |
| Ravintola Oulu MSA Oy | Hospitality | 2023 |
| Ravintola Oulun KMS Oy | Hospitality | 2019 |
| Ravintola Oulun kellari Oy | Hospitality | 2022 |
| Ravintola Pattijoen Karoliina Ky | | 1992 |
| Ravintola Pokkinen Oy | Hospitality | 2019 |
| Ravintola Punainen Mylly Oy | Hospitality | 2020 |
| Ravintola Queta Oy | Hospitality | 2006 |
| Ravintola TAT Oy | Hospitality | 2014 |
| Ravintola Tervahovi Oy | Hospitality | 2006 |
| Ravintola Uuden Seurahuoneen Hugo Oy | Hospitality | 2010 |
| Ravintola-Pizzeria La Pateniemi Oy | Hospitality | 2024 |
| Ravitsemusaakkoset Oy | Health & social care | 2008 |
| Ravsisu Oy | Health & social care | 2019 |
| Raxia Oy | Professional & scientific | 2013 |
| Re Financial Oy | Financial services | 2022 |
| ReNexT Generation Oy | Wholesale & retail | 2020 |
| RealFocus Oy | Real estate | 2020 |
| Rebell Consulting Oy | Professional & scientific | 2020 |
| Rebellion Capital Finland Oy | Financial services | 2026 |
| Recplay Oy | Professional & scientific | 1995 |
| RedoCap Invest Oy | Financial services | 2008 |
| RedoCap Oy | Information & communication | 2010 |
| Reefcape Oy | Health & social care | 2020 |
| Reeman Group Oy | Professional & scientific | 2022 |
| Reeniseppo Oy | Arts & recreation | 2018 |
| Refarma Oy | Wholesale & retail | 2010 |
| Refpro Oy | Construction | 2024 |
| Refreshing North Oy | Administrative & support | 2026 |
| Regsor fixaamo Oy | Other services | 2025 |
| Regwel Oy | Water & waste | 2022 |
| Rehaparkki Oy | Transport & logistics | 2011 |
| Rehti Siivous Oy | Administrative & support | 2024 |
| Reijo Heinonen Ky | Manufacturing | 1998 |