| Lauri Mäkipää Oy | Manufacturing | 2022 |
| Leam Oy | Wholesale & retail | 2025 |
| Lännen Vuokrainvestointi Oy | Real estate | 2021 |
| Länsi-Energia Oy | Manufacturing | 1995 |
| Länsi-Suomen Special Motors Ky | Other services | 1990 |
| Länsi-Suomen Teollisuuspalvelu Oy | Manufacturing | 2012 |
| Länsirannikon Konehuolto Oy | Other services | 2026 |
| M. Rehula Oy | Real estate | 1988 |
| M. Rintamäki Oy | Wholesale & retail | 2006 |
| M.R Grilli Oy | Hospitality | 2024 |
| MKR Kuljetus Oy | Transport & logistics | 2022 |
| MKR-Yhtiöt Oy | Construction | 2018 |
| MLA-ravintolat oy | Hospitality | 2025 |
| MOULDin Oy | Wholesale & retail | 2006 |
| Maanrakennus Lehtikangas Oy | Construction | 1998 |
| Manjou Oy | Construction | 2017 |
| Metsäkone Pohjankivi Oy | Transport & logistics | 1989 |
| Metsäkoto Oy | Health & social care | 2008 |
| Metsäurakointi Jokihaara Ky | Agriculture & fishing | 2014 |
| Mikmar Oy | Professional & scientific | 2021 |
| Mikmar Rakennus Oy | Construction | 2007 |
| Minomet Oy | Real estate | 2022 |
| Motourakointi J. Kangas Oy | Agriculture & fishing | 2011 |
| Mäkelä Group Oy | Wholesale & retail | 2022 |
| Mäntylän Pirssi Oy | Transport & logistics | 2013 |
| NORTHWESTPRO Oy | Other services | 2020 |
| Nahkanoorakka Ky | Manufacturing | 1987 |
| Nelinpeli Oy | Hospitality | 2009 |
| Nelosan Oy | Construction | 2020 |
| Niepar Group Oy | Professional & scientific | 2025 |
| Niepar Oy | Construction | 1989 |
| Noormarkun Hammaspiste Oy | Health & social care | 2002 |
| Noormarkun Jennia Oy | Real estate | 1995 |
| Noormarkun Kiinteistöpalvelu Oy | Administrative & support | 2001 |
| Noormarkun Kuljetus avoin yhtiö | Transport & logistics | 2009 |
| Noormarkun Metalli ky | Financial services | 1987 |
| Noormarkun Muovi Ky | Manufacturing | 1969 |
| Noormarkun Notariaatti Oy | Professional & scientific | 2021 |
| Noormarkun Saha Oy | Manufacturing | 1982 |
| Noormarkun Sähkö- ja AV-tekniikka Oy | Construction | 2018 |
| Noormarkun TV ja Video Oy | Wholesale & retail | 1995 |
| Noormarkun Tiliassa Oy | Professional & scientific | 2009 |
| Norijama Oy | Manufacturing | 2011 |
| Norwet Ky | Manufacturing | 1996 |
| Oilplus Oy | Transport & logistics | 1993 |
| Omnialux Oy | Wholesale & retail | 2009 |
| Oy Extremetal Ab | Manufacturing | 2007 |
| Oy ensio digital Ab | Information & communication | 2024 |
| PK Invest Oy | Real estate | 2026 |
| PK Nosto & Kuljetus Oy | Transport & logistics | 2016 |
| PK Solutions Oy | Manufacturing | 2025 |
| PK-Konepalvelu avoin yhtiö | Agriculture & fishing | 2008 |
| PK-Metsätyö avoin yhtiö | Agriculture & fishing | 2005 |
| Pakhall Oy | Real estate | 2001 |
| Palmulandia Oy | Professional & scientific | 2022 |
| Palmvest Oy | Financial services | 2025 |
| Para Industrial Oy | Professional & scientific | 2024 |
| Pelti ja ilmastointi Viikisalo Oy | Construction | 1981 |
| Pelti-ja konetyö Beni Oy | Construction | 2017 |
| Pihlanlehto Oy | Health & social care | 2020 |
| Piives Oy | Mining & quarrying | 2019 |
| Pikama Oy | Administrative & support | 1994 |
| PintaLux Oy | Construction | 2023 |
| Porin Konepojat Oy | Other services | 2019 |
| Porin Mavirak Ky | Construction | 1988 |
| Porin Special Motors Engineering Oy | Manufacturing | 2011 |
| Privo oy | Transport & logistics | 2014 |
| RH-Merchandising Ky | Financial services | 1998 |
| Rakennus Pitkänen Oy | Construction | 2025 |
| Rakennusliike KR Heinonen Oy | Construction | 1989 |
| Rakennuspalvelu Aalto Oy | Construction | 2007 |
| Rakennuspalvelu Lindgren Oy | Construction | 2025 |
| Rakennussuunnittelu Koskinen Oy | Professional & scientific | 1994 |
| Rakennusurakointi VMT Oy | Construction | 2000 |
| Rannikon Pintapalvelut Oy | Construction | 2021 |
| Raskashuolto D. Uusitalo Oy | Other services | 2025 |
| Ratapihankatu Holding Oy | Administrative & support | 2021 |
| Rautarakenne M Räsänen Oy | Other services | 1994 |
| RayStyle Oy | Construction | 2025 |
| Relax-Rakenne Oy | Construction | 2001 |
| Rimanylitys Oy | Arts & recreation | 2023 |
| Rossilan Oy | Financial services | 2017 |
| Rukala Oy | Arts & recreation | 2025 |
| S-A Joyful Oy | Administrative & support | 2019 |
| SIILE Oy | Real estate | 2008 |
| SJ-Truck Oy | Transport & logistics | 2011 |
| SJS-tuotanto Oy | Arts & recreation | 2023 |
| Smtek OY | Construction | 2024 |
| SVK-Viihdepalvelut Oy | Real estate | 2022 |
| Sairaankuljetus Uusitalo Ky | Health & social care | 1989 |
| Saraviiki Oy | Wholesale & retail | 1994 |
| Sata-Medi Oy | Health & social care | 1998 |
| Satakunnan Esitetyö Ky | Wholesale & retail | 1987 |
| Satakunnan Siisti+ Oy | Administrative & support | 2022 |
| Satakunnan Sähköasennus Oy | Construction | 1992 |
| Sfit Holding Oy | Professional & scientific | 2025 |
| Siirtoerkkilä Oy | Transport & logistics | 1991 |
| Siivous Koivu Oy | Administrative & support | 2020 |
| Sprinfit Oy | Construction | 2021 |
| StockPoint Oy | Professional & scientific | 2019 |