| Pohjan Kauppatalo Oy | Real estate | 1983 |
| Pohjan Purtava Oy | Hospitality | 2011 |
| Pohjan Rakennuskone Oy | Administrative & support | 1984 |
| Pohjanmaan Kiinteistöpalvelut Oy | Real estate | 2018 |
| Pohjanmaan Kiinteistötutkinta Oy | Professional & scientific | 2015 |
| Pohjanmaan Kurottajapalvelu Oy | Construction | 2008 |
| Pohjanmaan Laatukuljetus Oy | Transport & logistics | 2009 |
| Pohjanmaan Liukuovi Oy | Wholesale & retail | 2005 |
| Pohjanmaan Medicus Oy | Health & social care | 1993 |
| Pohjanmaan Monialapalvelu Oy | Administrative & support | 2025 |
| Pohjanmaan Moottorikoneistus Oy | Other services | 2019 |
| Pohjanmaan Ompelukone Oy | Wholesale & retail | 1985 |
| Pohjanmaan Peltityöt Oy | Construction | 2012 |
| Pohjanmaan Perheravintolat Oy | Hospitality | 2021 |
| Pohjanmaan Puhdistustekniikka Oy | Construction | 2016 |
| Pohjanmaan Raudoite Oy | Construction | 2004 |
| Pohjanmaan Suoramarkkinointi Oy | Wholesale & retail | 2019 |
| Pohjanmaan TT-Tili Oy | Professional & scientific | 2014 |
| Pohjanmaan Tehdaspalvelu Oy | Wholesale & retail | 1991 |
| Pohjanmaan Teollisuuskatot Oy | Construction | 2020 |
| Pohjanmaan Trukki Oy | Manufacturing | 2023 |
| Pohjanmaan peltirakentajat Oy | Construction | 2020 |
| Pohjanmaan tapahtumatekniikka Oy | Arts & recreation | 2025 |
| Polarbell Oy | Construction | 2000 |
| Polarmar Oy | Manufacturing | 2005 |
| Polarwall Oy | Administrative & support | 2007 |
| Porcellus Oy | Professional & scientific | 2025 |
| Post Ferrum Oy | Financial services | 2024 |
| Potentia valmennus Oy | Health & social care | 2023 |
| Powerium Oy | Professional & scientific | 2019 |
| Pramia Kalusteet Ky | Wholesale & retail | 2002 |
| Pregame Anttila Oy | Education | 1996 |
| PressOne Oy | Manufacturing | 2018 |
| Priatec Oy | Construction | 2011 |
| Priavest Oy | Financial services | 2025 |
| Priima Siivot Anne Ky | Administrative & support | 2025 |
| Priima Trio Oy | Wholesale & retail | 2020 |
| Priima Yrityslaskenta Oy | Professional & scientific | 1979 |
| Priimaa ja Komiaa Oy | Professional & scientific | 2009 |
| Priimafix Oy | Administrative & support | 2026 |
| PrimaRock Oy | Construction | 2022 |
| Primafinn Oy | Real estate | 2005 |
| Printingservice Serikari Oy | Manufacturing | 1994 |
| Privat-Vaunu Ky | Wholesale & retail | 1987 |
| ProAgria Tapahtumat Oy | Administrative & support | 2020 |
| ProLeader Oy | Professional & scientific | 2007 |
| Procuzilla Holding Oy | Financial services | 2021 |
| Profest oy | Arts & recreation | 2000 |
| Profit Lab Oy | Financial services | 2023 |
| Projantti Oy | Education | 1994 |
| Projectium Oy | Construction | 2021 |
| Promagia Oy | Real estate | 2017 |
| Prommausmedia Oy | Wholesale & retail | 2019 |
| PropCon Oy | Real estate | 2006 |
| Proptaste Oy | Professional & scientific | 2000 |
| Prostatum Oy | Health & social care | 2018 |
| Prover Oy | Professional & scientific | 2000 |
| Provetum Oy | Information & communication | 2003 |
| Provina Tekstiilipalvelut - Textilservice Oy | Other services | 1969 |
| Pruukin Kilta Oy | Real estate | 1975 |
| Psykiatripalvelu Armonia Oy | Health & social care | 2011 |
| Psykologipalvelu Minna Roiha Oy | Health & social care | 2021 |
| Psykoterapia Merja Laitila Oy | Health & social care | 2022 |
| Psykoterapiapalvelu Pete Vesterlund Oy | Health & social care | 2024 |
| Ptvgym Seinäjoki Oy | Arts & recreation | 2020 |
| Pulivari Oy | Hospitality | 2024 |
| Pultranen Oy | Real estate | 1987 |
| PunttiX Oy | Arts & recreation | 2024 |
| Puolu Catering Ky | Hospitality | 2018 |
| PusaIns Oy | Professional & scientific | 2023 |
| Puulinja Suomi Oy | Wholesale & retail | 2010 |
| Puumajuri OY | Manufacturing | 2021 |
| Pyhä Ketsuppi Oy | Hospitality | 2011 |
| Pyhä Savu Oy | Hospitality | 2015 |
| Pyörä- ja Suksihuolto Kärki Oy | Other services | 2026 |
| Pyörähtää Holding Oy | Financial services | 2023 |
| Päiväkoti Jump Oy | Education | 2016 |
| Päiväkoti Jump Seinäjoki Oy | Education | 2020 |
| Päiväkoti Suvikello Oy | Education | 2018 |
| Päiväkoti TRIO Oy | Education | 2018 |
| Pääkkönen kiinteistöt Oy | Real estate | 2006 |
| Pölyturvemiehet-Leinonen Ky | | 1982 |
| Pöytälaakso Holding Oy | Financial services | 2024 |
| Qualitas NDT Oy | Professional & scientific | 2003 |
| Queen Esther company Oy Ltd | Wholesale & retail | 2013 |
| R Mokki Oy | Wholesale & retail | 2009 |
| R Peltokangas Oy | Wholesale & retail | 2003 |
| R autofiksaus Oy | Other services | 2025 |
| R2BROS OY | Real estate | 2021 |
| RAN-Yhtiöt Oy | Real estate | 2006 |
| RAT Finland Oy | Wholesale & retail | 2025 |
| RBox Oy | Professional & scientific | 2019 |
| RE-putiikki Oy | Wholesale & retail | 2022 |
| REAL E3 Systems Oy | Information & communication | 2026 |
| RED BALL Osk. | Administrative & support | 2015 |
| REF Kiinteistöt Oy | Real estate | 2020 |
| REF invest Oy | Real estate | 2018 |
| Rengas - Tomico OY | Wholesale & retail | 2017 |
| Reol OY | Professional & scientific | 2013 |
| RJ Pumix Oy | Construction | 1999 |