| Miilar Veneet Oy | Manufacturing | 2006 |
| Mikko Nummi Oy | Transport & logistics | 2017 |
| Mikmaker Oy | Construction | 2010 |
| Mikola Communication Design Oy | Professional & scientific | 2015 |
| Milada Oy | Professional & scientific | 2005 |
| Mimas Oy | Real estate | 2015 |
| MinMat Oy | Administrative & support | 2025 |
| MinnaK Holding Oy | Real estate | 1994 |
| Monni technologies Oy | Information & communication | 2024 |
| Mortteli Oy | Wholesale & retail | 2022 |
| Movest Oy | Administrative & support | 2022 |
| Myrsky-Janne Oy | Manufacturing | 1996 |
| Nasukas Oy | Agriculture & fishing | 2006 |
| Nasus Oy | Agriculture & fishing | 2020 |
| New Town restaurants Oy | Hospitality | 2015 |
| NiJust Oy | Health & social care | 2019 |
| Niiles Consulting Oy | Administrative & support | 2021 |
| No Limit Training Oy | Arts & recreation | 2025 |
| Nordic Soya Oy | Manufacturing | 2015 |
| Nordic Yards Oy | Financial services | 2022 |
| Novoplastik Oy | Manufacturing | 2002 |
| NumberMill Oy | Professional & scientific | 1994 |
| Nuohouspalvelu Sale Oy | Administrative & support | 2008 |
| Nurkora Oy | Construction | 2006 |
| Nystad Natur Oy | Manufacturing | 2025 |
| Nystad Sauna Company Oy | Agriculture & fishing | 2018 |
| Näyttämö -keittiöt Oy | Manufacturing | 1997 |
| OA Invest Oy | Professional & scientific | 2020 |
| OSFS - Invest Oy | Financial services | 2021 |
| OSS - lnvest Oy | Financial services | 2021 |
| Ohiston Kauppapuutarha Ky | Agriculture & fishing | 1990 |
| Olkkari 2.0 Oy | Hospitality | 2026 |
| Osakeyhtiö Kuljetin | Manufacturing | 1967 |
| Osuuskunta Viiksihiki | Arts & recreation | 2017 |
| Outi Nurmi Oy | Wholesale & retail | 2005 |
| Oy Backwater Trading Ltd | Wholesale & retail | 2014 |
| Oy Kauppahuone Ducat Ab Ltd | Wholesale & retail | 2011 |
| Oy Matka Galleria Ab | Administrative & support | 1989 |
| Oy Newtown Aviation Services Ltd | Manufacturing | 2025 |
| Oy Omega Shipping Ab | Agriculture & fishing | 2008 |
| Oy Viejos Amigos Ltd | Financial services | 1985 |
| P. Lomppi OY | Real estate | 2011 |
| P.O. Viitanen Ky | Transport & logistics | 1983 |
| PK-Yritysvälitys Ky | Professional & scientific | 1992 |
| Painopiste Pränt Oy | Manufacturing | 2019 |
| Pajala Group Oy | Financial services | 2026 |
| Pajala Ky, Kari Toivanen | Professional & scientific | 1990 |
| Pajalan Pojat Oy | Real estate | 2009 |
| Pajecon Oy | Professional & scientific | 1993 |
| Palaraum Oy | Wholesale & retail | 2009 |
| Peeärrä Oy | Arts & recreation | 2007 |
| Peltolan Nuohous Oy | Administrative & support | 2024 |
| Penarco Oy | Wholesale & retail | 1997 |
| Pernunsalmen Vesi Oy | Water & waste | 1978 |
| Pinetree Cottages Oy | Hospitality | 2021 |
| Plari Oy | Information & communication | 1975 |
| Pohitulli Oy | Construction | 2016 |
| Pohjaisten apu Oy | Health & social care | 2026 |
| Polartechnology Oy | Construction | 2006 |
| Pooki Foods Oy | Hospitality | 1986 |
| Poraajantien Halli Oy | Real estate | 2001 |
| Pro Craft Marine Oy | Wholesale & retail | 2020 |
| ProCruise Oy | Transport & logistics | 2010 |
| ProSteer Oy | Transport & logistics | 2006 |
| ProcuPro Oy | Professional & scientific | 2021 |
| Psykoterapia- ja hyvinvointipalvelut Sydämellä Oy | Health & social care | 2021 |
| Puhtech Oy | Manufacturing | 2017 |
| Putkiasennusliike Jonni Sjöberg, kommandiittiyhtiö | Construction | 1978 |
| Puuhalli K&K Oy | Wholesale & retail | 2006 |
| Pärren Paja Oy | Real estate | 1993 |
| R&M Engineering Oy | Professional & scientific | 2013 |
| RK-Housing Oy | Hospitality | 1989 |
| RMT Rakennus OY | Construction | 2023 |
| Raffi Graphix Oy | Professional & scientific | 2014 |
| Raijan Kioski Tiina Laurila Ky | Wholesale & retail | 1991 |
| Raital avoin yhtiö | Construction | 2014 |
| Rake Product Oy | Professional & scientific | 1999 |
| Rakennus Lehtonen Oy | Construction | 2002 |
| Rakennus M.Elo Oy | Construction | 2019 |
| Rakennusarkkitehti Marko Arvonen Oy | Professional & scientific | 2011 |
| Rakennuskonsultointi Nieminen OY | Professional & scientific | 2008 |
| Rakennusliike E Kylä-Kaila Oy | Construction | 1996 |
| Rakennusliike Harry Autio Oy | Construction | 1984 |
| Rakennusliike Laurila Oy | Construction | 2008 |
| Rakennustoimisto R. Laiho Oy | Construction | 1985 |
| Rakennustyö Salmela Oy | Construction | 2020 |
| Rakennusurakointi A. Lehtonen Oy | Construction | 2014 |
| Rakennusurakointi M Lepola Oy | Construction | 2016 |
| Rannikon Kalatuote KY | Agriculture & fishing | 2011 |
| Raskas Rengas Oy | Wholesale & retail | 2018 |
| Rattailla Oy | Transport & logistics | 2018 |
| Raumantienseudun jätevesiosuuskunta | Water & waste | 2006 |
| Rautanen Group Oy | Construction | 1998 |
| Rautaväri Oy | Professional & scientific | 2006 |
| Ravintola Luode Oy | Hospitality | 2024 |
| ReSa Oy | Hospitality | 2024 |
| Remojob Oy | Manufacturing | 2002 |
| Rinnekoti Jäsperlä avoin yhtiö | Health & social care | 1998 |
| Rohijärven viemäriosuuskunta | Water & waste | 2018 |
| Rosamunda Oy | Hospitality | 2013 |