| Rakennus ja huolto Heide oy | Construction | 2019 |
| Rakennus-Holma Oy | Construction | 1990 |
| Rakennusapu Laakso Oy | Construction | 2004 |
| Rakennusliike Niko Härkönen Oy | Construction | 2007 |
| Rakennusliike Tanerak Oy | Construction | 2011 |
| Rakennuspalvelu Aaret Oy | Construction | 2021 |
| Rakennuspalvelu J.Hietikko Oy | Construction | 2016 |
| Rakennuspalvelu Tauriainen Ky | Construction | 1990 |
| Rakennusplussa Oy | Real estate | 1989 |
| Rakennustaito Haavisto Oy | Construction | 2000 |
| RakkaHalli Mäntsälä Oy | Real estate | 2025 |
| RakkaVuori Partners Oy | Real estate | 2024 |
| Rakmentor Holding Oy | Financial services | 2026 |
| Raksakone Oy | Administrative & support | 1997 |
| Raksire Oy | Construction | 2022 |
| Rantanurmi Oy | Real estate | 1989 |
| Rappaus-KJ Oy | Construction | 1995 |
| Rasteno Oy | Wholesale & retail | 1998 |
| Raul Invest Oy | Professional & scientific | 2023 |
| Rautecon Oy | Professional & scientific | 1978 |
| Ravintola Kukkonen Oy | Hospitality | 2006 |
| Ravintola VIKI Oy | Hospitality | 2024 |
| Realcap Oy | Real estate | 1998 |
| Rebelle Hair Oy | Other services | 2026 |
| Recto Oy | Construction | 2023 |
| Redi-Yhtiöt Oy | Wholesale & retail | 2017 |
| ReformerStudio Oy | Arts & recreation | 2026 |
| Rehti Henkilöstöpalvelut Oy | Professional & scientific | 2008 |
| Reijonen Holding Oy | Financial services | 2010 |
| Reijonen Invest Oy | Financial services | 2020 |
| Reilin Sporthorses Oy | Agriculture & fishing | 2012 |
| Reimax Electronics Oy | Manufacturing | 1991 |
| Rekola Development Oy | Professional & scientific | 2013 |
| Rekola Group Oy | Professional & scientific | 2022 |
| Remontti Klara Oy | Construction | 1995 |
| Remonttipalvelu Malun Oy | Construction | 2020 |
| Rempart Oy | Construction | 1986 |
| Remppasun Oy | Construction | 2010 |
| Rene Remontti Oy | Construction | 2025 |
| Reneks Palvelut Oy | Construction | 2015 |
| Rengasmyynti Nurmela Oy | Wholesale & retail | 1984 |
| Rensi Finland Oy | Wholesale & retail | 1993 |
| RentFleet Oy | Administrative & support | 2009 |
| Resets Oy | Real estate | 2022 |
| Respobit Oy | Information & communication | 2020 |
| Resqsafe Finland Oy | Wholesale & retail | 2017 |
| Reva Oy | Construction | 2025 |
| Revenue Generator Finland Oy | Professional & scientific | 2025 |
| RevonTattoo Oy | Other services | 2023 |
| Rhinion Oy | Health & social care | 2009 |
| Ricotec Oy | Manufacturing | 1990 |
| RingRoad Oy | Education | 2018 |
| RisQ Training Oy | Other services | 2025 |
| Rivers Project OY | Construction | 2021 |
| RoKTc Oy | Arts & recreation | 2025 |
| Rockbyte Oy | Information & communication | 2025 |
| Rogerin R.U.N.O. Oy | Other services | 1973 |
| Rolltone Oy | Arts & recreation | 2009 |
| Roope Warehouse Service Oy | Transport & logistics | 2014 |
| Rose Chrystal Beauty Studio Oy | Other services | 2023 |
| Roue Enterprise Oy | Financial services | 2020 |
| Rumo Oy | Hospitality | 2026 |
| Römmä Oy | Wholesale & retail | 2025 |
| S & R Juristin kiinteistövälitys Oy LKV | Financial services | 1988 |
| S&S Limited Oy | Hospitality | 2023 |
| S.A-Rakennus Oy | Construction | 2024 |
| SABIC Innovative Plastics Finland Oy | Wholesale & retail | 1995 |
| Sanla OY | Other services | 2015 |
| SAP-Automaatio Oy | Professional & scientific | 1991 |
| Savetex OY | Construction | 2023 |
| SB Business Consulting Oy | Information & communication | 2017 |
| Sha'R OY | Other services | 2014 |
| SHPP Finland Oy | Wholesale & retail | 2019 |
| SK Element Oy | Construction | 2023 |
| SK&P Consulting Oy | Professional & scientific | 2010 |
| SK-ark Oy | Professional & scientific | 2016 |
| SKK Palvelut Oy | Professional & scientific | 2009 |
| SMV Capital Oy | Professional & scientific | 2024 |
| SN Medical Partners Oy | Health & social care | 2026 |
| SP Suorite Oy | Administrative & support | 2023 |
| SPB Group Helsinki OY | Construction | 2016 |
| SPV Rakennus Oy | Construction | 2012 |
| SRI GROUP Oy | Wholesale & retail | 2022 |
| SSV Group Oy | Construction | 2025 |
| ST Partners Oy | Construction | 2024 |
| ST Works Oy | Construction | 2025 |
| STR Rakennus Oy | Construction | 2025 |
| SV-Kylmä Oy | Manufacturing | 2017 |
| Safepek Oy | Construction | 2026 |
| Sainio Yhtiöt Oy | Professional & scientific | 2020 |
| Salmetek Oy | Real estate | 1989 |
| Saltnose Medical Oy | Wholesale & retail | 2021 |
| SanRax Oy | Construction | 1998 |
| Sanctus Oy | Wholesale & retail | 2012 |
| Sandbox Innovations Oy | Professional & scientific | 2022 |
| Saneeraus Nissilä Oy | Construction | 2022 |
| Saneerauspojat Oy | Construction | 2021 |
| SanterGroup Oy | Construction | 2023 |
| Saranen LKV Oy | Real estate | 2024 |
| Sarriojärvi Oy | Financial services | 2018 |