| PL EV Solutions Ab | Wholesale & retail | 2019 |
| PMR Performance Oy | Arts & recreation | 2020 |
| PP Control Oy | Construction | 2014 |
| PPMedi Oy | Administrative & support | 2020 |
| PPP Finland Oy | Transport & logistics | 2017 |
| PRGN Capital Oy | Financial services | 2023 |
| PRGN Invest Oy | Manufacturing | 2008 |
| PRK Kiinteistöt Oy | Real estate | 2022 |
| PROKON Wind Energy Finland Oy | Construction | 2011 |
| PROWO Oy | Wholesale & retail | 2026 |
| PS Finance Group OY | Administrative & support | 2017 |
| PTA Huolto Oy | Other services | 2026 |
| PVT Power Oy | Manufacturing | 2025 |
| PVT Works Oy | Construction | 1997 |
| Paasiala Oy | Construction | 2006 |
| Pahulveer Oy | Hospitality | 2024 |
| Painotalo Varteva Oy | Manufacturing | 2012 |
| Pallolasse Ky | Wholesale & retail | 1976 |
| Palmex Mining Oy | Construction | 1988 |
| Palmroth Consulting Oy | Financial services | 2001 |
| Palosaaren Kiinteistöpalvelu Oy | Real estate | 1988 |
| Palosaaren Yrityskeskus Oy | Real estate | 2022 |
| Palosaarentien Lämpö Oy - Brändövägens Värme Ab | Administrative & support | 1967 |
| Palveluosuuskunta-Serviceandelslaget Pohjan Akat | Health & social care | 2000 |
| Pamilap Oy | Professional & scientific | 1978 |
| Pancake Island Oy | Hospitality | 2024 |
| Paniken Mökkitalkkarit Oy | Real estate | 2022 |
| Pappasgroup Oy | Real estate | 2018 |
| Papperi Oy | Wholesale & retail | 1996 |
| Paramar Ab Oy | Arts & recreation | 2014 |
| Parcelln Ab | Professional & scientific | 2011 |
| Parkanon Aurinko Oy | Energy | 2023 |
| Parkanon Tuuli Oy | Energy | 2020 |
| Parkotec Oy | Manufacturing | 2024 |
| Parturi-Kampaamo Manner Ky | Other services | 1992 |
| Parturi-kampaamo Inspis Oy | Other services | 2004 |
| Parturi-kampaamo Maija Kuivasniemi Ky | Other services | 1983 |
| Parturiliike Anne ja Pia Oy | Other services | 2017 |
| Patalämpö Oy | Administrative & support | 1967 |
| Patrik Pedersen Oy Ab | Real estate | 2021 |
| Pauliina Pirhonen oy | Professional & scientific | 2024 |
| Paviljongvägen 21 Oy/Ab | Hospitality | 2017 |
| Pavilla Oy | Wholesale & retail | 2013 |
| Pearl Holding Oy | Financial services | 2026 |
| PecC Oy | Professional & scientific | 2025 |
| Pecce Oy | Health & social care | 2007 |
| Pecrin palvelut Oy | Administrative & support | 2020 |
| Pekan Tiimi Oy | Financial services | 1989 |
| Pekka Hannuksela Oy | Real estate | 1975 |
| Pekka Teräväinen Oy | Professional & scientific | 1979 |
| Pekudent Invest Oy | Manufacturing | 2004 |
| Pelti- ja Metallityöt om. velj. Pastuhov | Manufacturing | 1976 |
| Pemmikki Oy | Wholesale & retail | 2021 |
| Pentalib Ab | Wholesale & retail | 2012 |
| Perfinance Oy | Financial services | 2026 |
| Performance Group Oy | Professional & scientific | 2019 |
| Pero Logistics Ab | Transport & logistics | 2025 |
| Peter Fjellström Oy | Professional & scientific | 1992 |
| Pharmacy House Oy Ab | Hospitality | 2020 |
| Pi-Va Invest Oy | Professional & scientific | 2024 |
| Piccolo Group Oy | Professional & scientific | 2006 |
| Piccolo Logistics Oy | Transport & logistics | 1989 |
| Pieneläinten hautaustoimisto Tähtipöly Oy | Other services | 2017 |
| Pienimaki Company Oy | Professional & scientific | 2019 |
| Pientupa Oy | Real estate | 2018 |
| Pihma Botnia Oy | Construction | 2021 |
| Pika Analytics Consulting Oy | Professional & scientific | 2023 |
| Pikuliten Ab | Wholesale & retail | 2025 |
| Pilota Holding Oy | Financial services | 2020 |
| Pilvilampi Software Oy | Information & communication | 2016 |
| Pine3 Ltd Ab | Professional & scientific | 2011 |
| Pinglan Oy | Hospitality | 2019 |
| Pink Panda Oy | Hospitality | 2024 |
| Pintaa Coatings Oy | Construction | 2011 |
| Pipaluuk Oy | Wholesale & retail | 2019 |
| Pirttilehtolaiset Oy | Financial services | 2022 |
| Piwatt Oy | Professional & scientific | 2021 |
| Pixel Master Oy | Professional & scientific | 2024 |
| Pizzeria Wanhis Ay avoin yhtiö | Hospitality | 2016 |
| Pjas Productions Ab | Arts & recreation | 2014 |
| Pk Hangaskurunkangas Oy | Energy | 2026 |
| Plan B Conference Öb | Administrative & support | 2015 |
| Planitol Ab | Professional & scientific | 2022 |
| Platinum Boats Oy Ab | Wholesale & retail | 2024 |
| Platinum Motors Oy | Wholesale & retail | 2020 |
| Platonic Partnership Oy | Information & communication | 2017 |
| Plus Team Oy | Hospitality | 2023 |
| PnPLife Ab | Professional & scientific | 2021 |
| Podeco Oy | Real estate | 1991 |
| Pohjanmaan Artteli Oy | Education | 2003 |
| Pohjanmaan Asemat Oy | Wholesale & retail | 2013 |
| Pohjanmaan Asunnot LKV Oy | Real estate | 2026 |
| Pohjanmaan Expo Oy - Expo Österbotten Ab | Administrative & support | 1988 |
| Pohjanmaan Keittiökalustetukku Oy | Wholesale & retail | 1998 |
| Pohjanmaan Kiinteistökorjaus Oy | Construction | 2013 |
| Pohjanmaan Kinestetiikka Oy Ab | Health & social care | 2013 |
| Pohjanmaan LVIS-Säätö ja Huolto Oy | Construction | 2011 |
| Pohjanmaan Laatukartoitus oy | Professional & scientific | 2024 |
| Pohjanmaan Lemmikkihoitola Oy | Other services | 2025 |
| Pohjanmaan Pinnoituspalvelut Oy | Manufacturing | 2008 |