| Rakennustoimisto I. Uusitalo Ky | Construction | 1984 |
| Rakennustoimisto Insinöörilinja Oy Kotka | Construction | 1994 |
| Rantamestarit Oy | Construction | 1994 |
| Rokkilokki Oy | Professional & scientific | 2013 |
| Royalia Oy | Hospitality | 2001 |
| Ruffen Oy | Construction | 2022 |
| Run Group Oy | Financial services | 2006 |
| Run Kiinteistöt Oy | Real estate | 2017 |
| Runvest Oy | Financial services | 2005 |
| Ruukin Ravintolat Oy | Hospitality | 2022 |
| SN-Trade Ky | Transport & logistics | 2002 |
| Sampsa Turpeinen Oy | Professional & scientific | 2022 |
| Scan Yard Oy | Hospitality | 2011 |
| Sea Group Oy | Construction | 2008 |
| Si-Nu Oy | Health & social care | 2017 |
| Silacraft Oy | Manufacturing | 2021 |
| Suomen Tunnelitekniikka Oy | Construction | 2012 |
| Suunnittelutoimisto N&O Oy | Professional & scientific | 1986 |
| Syvälahti Consulting Oy | Professional & scientific | 2025 |
| Sähkö J. Sjögren Oy | Construction | 2015 |
| Sähköinen Tilintarkastus Pyhtää Oy | Professional & scientific | 2022 |
| Sähköpalvelu Sjögren Oy | Construction | 2015 |
| Sähkösaneeraus H. Pulkkinen Ky | Construction | 1992 |
| Sähkövartio Nieminen Oy | Construction | 2010 |
| Team Oldi Holdi Oy | Arts & recreation | 2018 |
| Tilihanholmi Oy | Professional & scientific | 2012 |
| Tilipalvelu Mia Taka-aho Ky | Professional & scientific | 2001 |
| Tilitoimistopalvelut Heidi Laakkonen Ky | Professional & scientific | 2006 |
| Timo Teippi Oy | Professional & scientific | 1985 |
| Tojamet Oy | Manufacturing | 2012 |
| Tukkusilta Ky | Wholesale & retail | 1988 |
| Tuloskaivuri Oy | Construction | 2008 |
| Turja Productions Oy | Wholesale & retail | 2015 |
| Ukkometso J. Metsola Ky | Construction | 1984 |
| Vesirakennus J. Veppling Ky | Construction | 2015 |
| Vevaco Oy | Professional & scientific | 1997 |
| Vihmerä Ky | Manufacturing | 1979 |
| Västerby Agro Oy | Agriculture & fishing | 2016 |
| WS Solutions Oy | Wholesale & retail | 2016 |
| Wanha Vastila avoin yhtiö | Other services | 1998 |
| Wild energy heating Oy | Construction | 2025 |
| Ylärakkola Logistics Oy | Transport & logistics | 2019 |