| RCD Service Oy | Administrative & support | 2025 |
| RED Robot Company Oy | Professional & scientific | 2007 |
| REIM Hämeenlinna Oy | Real estate | 2008 |
| RG import Oy | Wholesale & retail | 2006 |
| RJ Consulting Ky | Health & social care | 1997 |
| RKKA Helsinki Oy | Administrative & support | 2007 |
| RMK-music Oy | Wholesale & retail | 2014 |
| RML-Tekniikka OY | Manufacturing | 1993 |
| Rovaew OY | Construction | 2021 |
| RPR Vakuutus ja Finanssi Oy | Financial services | 2005 |
| RTP Investments Oy | Financial services | 2021 |
| Raamarit Oy | Wholesale & retail | 1978 |
| RaamiDaamit Oy | Wholesale & retail | 2026 |
| Raatiyrtti Oy | Wholesale & retail | 2009 |
| Radesign Oy | Professional & scientific | 1992 |
| Rahtari Solutions Oy | Information & communication | 2025 |
| Rak-Remo Pajuoja Oy | Construction | 2022 |
| Raken Oy | Administrative & support | 2018 |
| Rakennus & Saneeraus Talvitie Oy | Construction | 2022 |
| Rakennus Eksitia Oy | Construction | 2017 |
| Rakennus Honka Oy | Construction | 2006 |
| Rakennus Onnela Oy | Construction | 2005 |
| Rakennus-Nokka Oy | Construction | 2004 |
| Rakennus-Saneeraus Juha Miettinen Oy | Professional & scientific | 2004 |
| Rakennusliike Huge Oy | Construction | 2013 |
| Rakennusliike Kaserat Ky | Construction | 1979 |
| Rakennusliike Nuotio & Vesterlund Oy | Construction | 2020 |
| Rakennusliike Raksakulma Oy | Wholesale & retail | 1994 |
| Rakennusliike Sinettä Oy | Construction | 2015 |
| Rakennusliike Teemu Veikkola Oy | Construction | 2009 |
| Rakennusmaalaus Tamminen Oy | Construction | 1984 |
| Rakennuspalvelu Kai Halminen Oy | Construction | 1992 |
| Rakennuspalvelu Kled & Edi Oy | Construction | 2019 |
| Rakennuspalvelu Mantila Oy | Construction | 1997 |
| Rakennuspalvelu Petri Jaakonsaari Oy | Construction | 2009 |
| Rakennuspalvelu Pukki Oy | Construction | 2021 |
| Rakennustoimisto Kasetcon Oy | Construction | 2003 |
| Rakennustyö Arto Vesanen Oy | Construction | 1998 |
| Rakennustyö Lehto Oy | Construction | 2026 |
| Rakennuttajapalvelu Rouhento Oy | Professional & scientific | 1989 |
| Rakentajan Puutavaratalo Oy | Wholesale & retail | 1998 |
| Raksalo Oy | Construction | 1993 |
| Rakta Network Oy | Professional & scientific | 1988 |
| Ralek Oy | Manufacturing | 2007 |
| Ramus Oy | Health & social care | 2009 |
| Rania Invest Oy | Professional & scientific | 2005 |
| Rania Oy | Professional & scientific | 2004 |
| Rannel Oy | Construction | 2004 |
| Ratasko Oy | Construction | 1993 |
| Raudoitus Saksala Oy | Construction | 2010 |
| Raunisto & Sons Oy Ltd | Manufacturing | 2021 |
| Ravintola Berfin Oy | Hospitality | 2007 |
| Ravintola Topcapi Sivas Oy | Hospitality | 2017 |
| RedPony Oy | Wholesale & retail | 2013 |
| Reijon Maatalouskeskus Ky | Wholesale & retail | 1980 |
| Reissusiskot Oy | Administrative & support | 2018 |
| Rekomat Oy | Wholesale & retail | 2022 |
| Rela-Tex Oy | Wholesale & retail | 2018 |
| Remedi Lux Oy | Health & social care | 2015 |
| Remontti Arkko Oy | Construction | 2006 |
| Remontti Setälä Oy | Other services | 2022 |
| Remontti-Helgkari Oy | Construction | 2013 |
| Rengas-Vekka Oy | Wholesale & retail | 2026 |
| Rengasliike Kumisetä Hämeenlinna Oy | Wholesale & retail | 2018 |
| Rengastamo Oy | Wholesale & retail | 2010 |
| Renovation Group Oy | Construction | 2022 |
| Renting Rentals Finland Oy | Administrative & support | 2017 |
| Repe Holding Oy | Financial services | 2022 |
| Resta-Sun Oy | Hospitality | 2008 |
| Resta-Tele Oy | Hospitality | 2001 |
| Retendum Oy | Real estate | 2025 |
| Retoriikan kesäkoulu oy | Education | 2012 |
| Rex Media Oy | Administrative & support | 2024 |
| Ricomet workforce Oy | Construction | 2019 |
| RiiMi & Kids Oy | Financial services | 2018 |
| Riihimäen Terveysmajakka Oy | Real estate | 1986 |
| Riihimäen Yrityspalvelu Oy | Professional & scientific | 2002 |
| Riinan Kivijalka Oy | Wholesale & retail | 2023 |
| Riistala Oy | Real estate | 2026 |
| Rinkelin Talohuolto Oy | Administrative & support | 1990 |
| Rinoll-Paperi Oy | Wholesale & retail | 1999 |
| Road to Vostok Oy | Information & communication | 2022 |
| Rodatel Oy | Real estate | 1990 |
| Roivainen 2015 Oy | Wholesale & retail | 1992 |
| Rok Partners Oy | Professional & scientific | 2019 |
| Roniman Oy | Transport & logistics | 2023 |
| Roothill Oy | Administrative & support | 2008 |
| Roots Building Oy | Construction | 2020 |
| Rosa Housing GP Oy | Real estate | 2011 |
| Rosa Housing Ky | Financial services | 2012 |
| Rossipossi Oy | Hospitality | 2017 |
| Roukkukivi Oy | Wholesale & retail | 2022 |
| Rowex Oy | Hospitality | 1994 |
| Royal Catering Oy | Hospitality | 2013 |
| Royal Hunting Club Finland Oy | Administrative & support | 2007 |
| Royal Taso Group Oy | Professional & scientific | 2020 |
| Rukaloma Oy | Real estate | 1971 |
| Ruoka Kivistö Oy | Wholesale & retail | 2019 |
| Ruveta Oy | Wholesale & retail | 2004 |
| Ryhmäperhepäivähoito Niksula Oy | Education | 2015 |