| Matias.Laukkanen Oy | Construction | 2024 |
| Matti Karvanen Ky | Wholesale & retail | 1994 |
| Menel Oy | Wholesale & retail | 1989 |
| Metallikumppanikko Oy | Manufacturing | 1992 |
| Metsäpalvelu Helminen Oy | Agriculture & fishing | 2018 |
| MiTo Invest Oy | Real estate | 2018 |
| Mikko Kaminen Kommandiittiyhtiö | Manufacturing | 1960 |
| Ministella Oy | Wholesale & retail | 1993 |
| Mobida Oy | Wholesale & retail | 2002 |
| Movedu Oy | Information & communication | 2010 |
| Myllymaa Valkama avoin yhtiö | Wholesale & retail | 2021 |
| Mäki-Filppula Oy | Wholesale & retail | 2002 |
| Mäkisen Sähkö Oy | Real estate | 1998 |
| Naartit oy | Real estate | 2025 |
| Nam's Bakery Oy | Manufacturing | 2021 |
| Norpa Oy | Real estate | 2026 |
| Northernlight Property Oy | Real estate | 2024 |
| Nummijoki Group Oy | Real estate | 2021 |
| Ojalan Pakari Oy | Manufacturing | 1977 |
| Oona Kauhajoki avoin yhtiö | Wholesale & retail | 2012 |
| Oranova Oy | Professional & scientific | 2021 |
| Oriole Group Oy | Wholesale & retail | 2017 |
| Oy Agrikapital Ab | Agriculture & fishing | 2020 |
| Oy Finnmajor Ab | Professional & scientific | 1992 |
| Oy Kustens Vind Ab | Energy | 2020 |
| Oy Lillby Vind Ab | Energy | 2020 |
| Oy Paananen Global LTD | Wholesale & retail | 2022 |
| Oy Teknokapital Ab | Financial services | 1992 |
| Oy Top Level LTD | Administrative & support | 2008 |
| Oy Ölands Vind Ab | Energy | 2021 |
| P. Hautala Oy | Professional & scientific | 1996 |
| P. Onnekas Oy | Agriculture & fishing | 2014 |
| P. Rotola-Pukkila Oy | Manufacturing | 1972 |
| PJ-Automation Oy | Professional & scientific | 1987 |
| PSJS-Kiinteistöt Oy | Real estate | 2008 |
| Paavon Lämpö Oy | Energy | 1979 |
| Palkintohuone avoin yhtiö | Wholesale & retail | 2004 |
| Palvelutaksit Janne Kortesluoma Ky | Transport & logistics | 2008 |
| Parjakan Turve Oy | Mining & quarrying | 2015 |
| Pekka Reuhkala Ky | Professional & scientific | 2003 |
| Pelo Sport Oy | Wholesale & retail | 2008 |
| Peltolan Turve Oy | Mining & quarrying | 2013 |
| Pentek Puusepänkeittiöt Oy | Construction | 1996 |
| Pentti Latva-Aro Oy | Transport & logistics | 1990 |
| Pesmel Oy | Manufacturing | 2007 |
| Petafex Ky | Agriculture & fishing | 2014 |
| Peterco Oy | Real estate | 1992 |
| Pharmal Oy | Wholesale & retail | 2022 |
| Piharati Oy | Professional & scientific | 2012 |
| Pihlajasuon Tuulivoima Oy | Energy | 2018 |
| Pikku-Jaakko Oy | Construction | 2024 |
| Pinomatic Oy | Manufacturing | 1989 |
| Piritta Lähteenmaa Oy | Professional & scientific | 2021 |
| Pistrinum Oy | Financial services | 2021 |
| Pizza MarKat Oy | Hospitality | 2021 |
| Pofir Oy | Real estate | 2006 |
| Pohjanmaan Sijoitus Oy | Financial services | 2011 |
| Pohjanmaan Sähkötukku Oy | Wholesale & retail | 1997 |
| Polikotti Oy | Wholesale & retail | 2010 |
| Prime-Kiinteistöt Oy | Real estate | 2010 |
| Printti Labra Oy | Professional & scientific | 2026 |
| Prioritas Oy | Wholesale & retail | 2015 |
| ProAaHoo Työt Oy | Other services | 2021 |
| Protox Oy | Manufacturing | 2017 |
| Psl Raipala Oy | Manufacturing | 1985 |
| Puheliina Oy | Health & social care | 2025 |
| Putkiasennus Nisula Oy | Construction | 2000 |
| Putkisaneeraus Rintala Oy | Construction | 2010 |
| Puukarhu Oy | Administrative & support | 2017 |
| Puutyö Hannulat Ky | | 1981 |
| Puuvarikko Oy | Manufacturing | 2005 |
| R. Mäki-Kyyny Oy | Mining & quarrying | 1985 |
| RAUDUSPUU Oy | Manufacturing | 2001 |
| RAW Vainionpää Oy | Administrative & support | 2015 |
| RM Rakennusmarket Oy | Wholesale & retail | 1981 |
| RP -keittiö Oy | Manufacturing | 1996 |
| RR Motors oy | Wholesale & retail | 2024 |
| RS-Talousneuvonta Oy | Administrative & support | 2023 |
| RS-Tili Ky | Professional & scientific | 1991 |
| RTV Invest Oy | Financial services | 2025 |
| Raija ja Toimi Kontro, avoin yhtiö | Construction | 1989 |
| Rainoma Oy | Agriculture & fishing | 1989 |
| RakMy Oy | Construction | 2020 |
| Rakennus K.Koski Oy | Construction | 2009 |
| Rakennus Saukko Oy | Construction | 2004 |
| Rakennus- ja saneerauspalvelu UPI Oy | Construction | 2022 |
| Rakennusliike Harju-Heikkilä Oy | Construction | 2009 |
| Rakennusliike L. Kiukkonen Oy | Construction | 1996 |
| Rakennuspalvelu Jani-Matti Oy | Construction | 2017 |
| Rakennuspalvelu Oja-Nisula Oy | Construction | 2023 |
| Rakennuspalvelu P. Kangasniemi Oy | Construction | 2021 |
| Rakennuspalvelu Vilponen Oy | Construction | 2024 |
| Rakennuspalvelut T. Kiukkonen Oy | Construction | 2003 |
| Rakentamisen Aitotaito Oy | Construction | 2018 |
| Ratakivi Kiinteistöt Oy | Real estate | 1996 |
| Ratova Oy | Agriculture & fishing | 2020 |
| Raudussauna Oy | Manufacturing | 2026 |
| Rauta Männistö Oy | Wholesale & retail | 2022 |
| Reilu Kaveri Oy | Health & social care | 2025 |
| Remontti Peltoniemi Oy | Construction | 2020 |