| Rain Money Trading Oy Ltd | Financial services | 2026 |
| Raine Rantanen Oy | Professional & scientific | 2017 |
| Raja Group Oy | Real estate | 2007 |
| RakPel Oy | Construction | 2013 |
| Rakennus H&R Oy | Construction | 2025 |
| Rakennus Jaakko Toivonen Oy | Wholesale & retail | 2019 |
| Rakennus Oy Lintek | Construction | 2011 |
| Rakennus TaloX Oy | Construction | 2006 |
| Rakennus TarMark Oy | Construction | 2020 |
| Rakennus- ja kiinteistöpalvelut Marko Helkala Oy | Professional & scientific | 2021 |
| Rakennus-Sutela Ky | Construction | 2001 |
| Rakennusliike Kolmera Oy | Construction | 1992 |
| Rakennusliike PK-insinööritoimisto Oy | Construction | 1992 |
| Rakennusliike T. Potinkara Oy | Construction | 1955 |
| Rakennuspalvelu Hannu Varpenius Ky | Construction | 1999 |
| Rakennuspalvelu Mörk Ky | Construction | 2011 |
| Rakennussuunnittelu ja -valvonta Valkoinen Linja Oy | Real estate | 2015 |
| Rakennuttajapalvelu Karvonen Oy | Real estate | 2000 |
| Ramo Health Care Oy | Health & social care | 2019 |
| Ramotec Oy | Construction | 2017 |
| Ranela Oy | Arts & recreation | 1998 |
| Ratakanaksi Oy | Other services | 2025 |
| Ratapaja Oy | Real estate | 2006 |
| Ravintola Chilin Pippuri Ky | Hospitality | 2008 |
| Ravintola Holvi Oy | Hospitality | 2024 |
| Ravintola Il-Ka Ky | Hospitality | 2006 |
| Ravintola Medya Ky | Hospitality | 2007 |
| Ravintola Pyöreä Torppa Ky | Hospitality | 1984 |
| Re-Star Oy | Water & waste | 2023 |
| Realhill Service Oy | Professional & scientific | 2025 |
| Realhillbus Oy | Mining & quarrying | 2000 |
| Recap Oy | Financial services | 1989 |
| Reiju-Yhtiöt Oy | Hospitality | 2024 |
| Rekry Talents Oy | Professional & scientific | 2022 |
| Remontilla Rahaksi Oy | Professional & scientific | 2025 |
| Remoteam Oy | Administrative & support | 2021 |
| Renet Europe Oy | Construction | 1977 |
| Rengastalli Oy | Wholesale & retail | 2023 |
| Rentlight Oy | Construction | 2022 |
| Repo Capital Oy | Financial services | 2023 |
| Reporanka Invest Oy | Construction | 2011 |
| Reporanka-Yhtiöt Oy | Other services | 2021 |
| Rescvia Oy | Professional & scientific | 2026 |
| Restaurointi & Rakennus Vasara Oy | Construction | 2010 |
| Revosil Oy | Real estate | 2014 |
| Riitala Oy | Construction | 2007 |
| Rinnesuoja Oy | Real estate | 1981 |
| Ripattila Holding Oy | Professional & scientific | 2026 |
| Risto Peltolan Leipomo Oy | Manufacturing | 1979 |
| Risto Y.J. Ranta Oy | Real estate | 1990 |
| River Capital Oy | Financial services | 2022 |
| Rocktel Oy | Hospitality | 2025 |
| Roihutar Oy | Administrative & support | 2026 |
| Rosavilla Kukkatila Oy | Arts & recreation | 2022 |
| Rose Star Ahertajat Oy | Construction | 2021 |
| Rotorway Flight Training Oy | Education | 2024 |
| Royaltam Oy | Real estate | 2006 |
| Ruihua Oy | Hospitality | 2024 |
| Ruoka ja Tankkaa Oy | Hospitality | 2023 |
| Ruoka-Siru Oy | Wholesale & retail | 1994 |
| Rödingin Tarhat Oy | Agriculture & fishing | 2020 |
| S & M Parikka Oy | Real estate | 2000 |
| S-T Kiinteistöt Oy | Real estate | 2001 |
| SBC Studio avoin yhtiö | Wholesale & retail | 1982 |
| SER Suomen Erikoisraivaus Oy | Construction | 2019 |
| SET-asennus Oy | Manufacturing | 2021 |
| SG Elementit Oy | Manufacturing | 2015 |
| SJ Finland Oy | Construction | 1985 |
| SJS Puupinta Oy | Manufacturing | 2024 |
| SLS-Kiinteistö Oy | Real estate | 2019 |
| SMJ Rakennus Oy | Construction | 2015 |
| SMTK Group Oy | Construction | 2021 |
| SSVA Oy | Real estate | 2021 |
| ST Liquorice Company Oy | Wholesale & retail | 2020 |
| Sad Nite Owl Oy | Hospitality | 1965 |
| Sakke-Service Oy | Manufacturing | 2014 |
| Sakun-kala Oy | Agriculture & fishing | 1998 |
| SalamanPoika Oy | Professional & scientific | 2025 |
| Salamark Ky | Wholesale & retail | 1977 |
| Sale & Marketing Finland Ky | Wholesale & retail | 2002 |
| Salo 14 Oy | Financial services | 2022 |
| Salpakiilto Oy | Other services | 2022 |
| Sam Teisko Oy | Information & communication | 2024 |
| SamKoti Oy | Real estate | 2021 |
| Samessi Oy | Professional & scientific | 1995 |
| SampSan Oy | Real estate | 2026 |
| SampoX Oy | Wholesale & retail | 2024 |
| Sandak Itä Oy | Administrative & support | 2007 |
| Santonix Oy | Wholesale & retail | 2021 |
| Sapesa-Rakennustyö Oy | Construction | 1989 |
| Sattumalta Oy | Financial services | 2004 |
| Scanfest Oy | Construction | 2001 |
| SecTools Oy | Wholesale & retail | 2009 |
| Seco pikakuivaus Oy | Construction | 2023 |
| Secon Security Oy | Administrative & support | 2007 |
| Selän-Pään Tuote Oy | Agriculture & fishing | 1973 |
| Sensei Digikortti Oy | Information & communication | 2026 |
| SensorNordic Oy | Administrative & support | 2026 |
| Sep-Pro Oy | Manufacturing | 1994 |
| Seribus Oy | Professional & scientific | 1983 |