| Rannikon Siivoustukku Oy | Wholesale & retail | 1997 |
| RantaMed Oy | Health & social care | 2024 |
| Rantakulman Linjat Oy | Transport & logistics | 2020 |
| Rantalaiho SpineCare Oy | Health & social care | 2025 |
| Rantanen & Hautamäki | Manufacturing | 2017 |
| Rantarakennus Vaihi Oy | Construction | 2024 |
| Rantasalo & Co. Oy | Professional & scientific | 2025 |
| Rapbil Oy | Wholesale & retail | 2019 |
| Rapinvest Oy | Financial services | 2005 |
| Rapitec Oy | Construction | 2005 |
| Rapo Electrics Oy | Construction | 2023 |
| Rappu Digital Oy | Information & communication | 2024 |
| Rapukuningas Ky | Agriculture & fishing | 2014 |
| Rare Ventures Oy | Financial services | 2020 |
| Rarm avoin yhtiö | Manufacturing | 2021 |
| Rasiantuntija Oy | Construction | 2022 |
| Rasil Oy | Administrative & support | 2021 |
| Raskas Invest Oy | Financial services | 2021 |
| Raskassähkö Oy | Other services | 1986 |
| Rastle Oy | Real estate | 1983 |
| Rasvajaloste Oy | Manufacturing | 1963 |
| RataTurvaPalvelut M.Kekäläinen Oy | Construction | 2024 |
| Ratas Design Works Oy | Professional & scientific | 2019 |
| Rataspanimo Oy | Manufacturing | 2016 |
| Ratavo Oy | Financial services | 1976 |
| Rational Oy | Construction | 1990 |
| Ratkaisupiste Oy | Health & social care | 2019 |
| Ratsutalli Friskala Oy | Agriculture & fishing | 2007 |
| Ratsutila Cavalier Oy | Arts & recreation | 2013 |
| Rauha Creative Oy | Arts & recreation | 2022 |
| Rauni perhe- ja terapiapalvelut Oy | Health & social care | 2025 |
| Raunistula Productions Oy | Arts & recreation | 2019 |
| Raunistulan Salibandykeskus Oy | Arts & recreation | 2017 |
| Rausanne Oy | Financial services | 1985 |
| Rausatum Oy | Financial services | 1996 |
| Rautajoki Consulting Oy | Professional & scientific | 2022 |
| Rautanen Investments Oy | Real estate | 2008 |
| Rautela Oy | Financial services | 2020 |
| RautoVal Oy | Professional & scientific | 2015 |
| Ravantit Oy | Hospitality | 1974 |
| Ravenkloo Oy | Real estate | 2003 |
| Ravintola Baan Thai Oy | Hospitality | 1998 |
| Ravintola Indima Oy | Hospitality | 2006 |
| Ravintola Kamila Oy | Hospitality | 2022 |
| Ravintola Kartuli Oy | Hospitality | 2024 |
| Ravintola Lara Oy | Hospitality | 2017 |
| Ravintola Maneerat Oy | Hospitality | 2012 |
| Ravintola Mik-Mak Oy | Hospitality | 2011 |
| Ravintola Mona & Pulpukka Ky | Hospitality | 1986 |
| Ravintola Pikkupihvi Oy | Hospitality | 2023 |
| Ravintola TiKaro avoin yhtiö | Hospitality | 2011 |
| Ravintola UNO Pääskyvuori avoin yhtiö | Hospitality | 2024 |
| Ravintola Wanha Rahtilaiva Oy | Real estate | 1992 |
| Ravintolalaiva Papa Joe Oy | Hospitality | 2026 |
| Ravintolaliike Laivanvarustajat Oy | Hospitality | 2011 |
| Ravintolamafia Oy | Hospitality | 2023 |
| Ravtec Oy | Construction | 2013 |
| Ravuri 19 Oy | Manufacturing | 2022 |
| Raw Organic Oy | Wholesale & retail | 2021 |
| Rawaset Oy Ltd | Wholesale & retail | 2017 |
| ReSiCal Kalibrointi Oy | Professional & scientific | 2015 |
| ReWo Enterprises Oy | Professional & scientific | 2024 |
| Reacer Oy | Construction | 2023 |
| Reagena Invest Oy | Real estate | 2012 |
| ReagoiTiedolla Oy | Financial services | 2008 |
| Real Growth Oy | Real estate | 2020 |
| Real MMC Oy | Information & communication | 2025 |
| RealCrab Oy | Financial services | 2024 |
| Reale Kiinteistöt Oy | Real estate | 1989 |
| Reale Oy | Real estate | 1995 |
| Reale Projektit Oy | Real estate | 1989 |
| Reale Rakennus Oy | Real estate | 2010 |
| Realisointi Dealshaker Oy | Wholesale & retail | 2019 |
| Realmare Oy | Real estate | 2018 |
| Realpolaria Oy | Real estate | 2018 |
| Realtor Chain in Finland Oy | Real estate | 2019 |
| Recard Oy | Professional & scientific | 1997 |
| Recepta Oy | Wholesale & retail | 2025 |
| Reckless Wire Oy | Professional & scientific | 2022 |
| Recore Oy | Administrative & support | 2026 |
| Recruitment Rising Oy | Administrative & support | 2025 |
| Red Mountain Capital Oy | Professional & scientific | 2011 |
| Red Nettle Studio Oy | Arts & recreation | 2019 |
| Red and Black Invest Oy | Financial services | 2011 |
| RedRock Energy Finland Oy | Energy | 2026 |
| Rederi Ab Fakir | Transport & logistics | 2009 |
| Rederi Ab Nathalie | Transport & logistics | 2009 |
| Rederi Avalon Oy | Transport & logistics | 2013 |
| Rediteq Oy | Information & communication | 1989 |
| Redito Investment Management Oy | Professional & scientific | 2016 |
| Redito Property Investors Oy | Real estate | 2013 |
| Redstone BLUE Fund I Ky | Financial services | 2025 |
| Reef Invest Oy | Professional & scientific | 2025 |
| Reel Band Music Oy | Information & communication | 2003 |
| Referator Oy | Professional & scientific | 1993 |
| Referenssiratkaisu Oy | Professional & scientific | 2023 |
| Refocon Oy | Manufacturing | 1994 |
| Refocon Shipbuilding Oy | Manufacturing | 2019 |
| Reginatum Oy | Real estate | 1996 |
| Regoja OY | Construction | 2025 |