| Parturi-Kampaamo Eve Oy | Other services | 2007 |
| Parturi-Kampaamo Get a Head avoin yhtiö | Other services | 1999 |
| Parturi-Kampaamo Merle Oy | Other services | 2004 |
| Parturi-Kampaamo Oma Oy | Other services | 2014 |
| Parturi-Kampaamo Ponnari Oy | Other services | 2020 |
| Parturi-Kampaamo Terttu & Hair Shop Ky | Other services | 2017 |
| Parturi-kampaamo Papiljonki Ky | Other services | 2013 |
| Parturimo Alex Oy | Other services | 2008 |
| Partybooth Oy | Professional & scientific | 2014 |
| Parviainen & Seppänen | Administrative & support | 2011 |
| Parvus Ora Oy | Professional & scientific | 2024 |
| Pasak Oy | Real estate | 2003 |
| Pasanen Yhtiöt Oy | Real estate | 2020 |
| PasiRempPasi Oy | Construction | 2025 |
| Pasikon Oy | Professional & scientific | 2016 |
| PastaRavintolat Oulu Oy | Hospitality | 2025 |
| Patan Oy | Hospitality | 2016 |
| Pataässä Vaasa Oy | Hospitality | 1994 |
| Patekki Oy | Construction | 2007 |
| Pateniemen Kodinkonehuolto Oy | Other services | 2008 |
| Patepal Oy | Information & communication | 2019 |
| Patikkatupa Osakeyhtiö | Real estate | 1983 |
| Patilat Oy | Real estate | 2006 |
| Patinki Oy | Real estate | 1994 |
| Patofly Adventures Oy | Hospitality | 2025 |
| Paula Ala-Ketola avoin yhtiö | Health & social care | 1993 |
| Paulan Tilipalvelu Ky | Professional & scientific | 2021 |
| Paulin Puupalvelu Kommandiittiyhtiö | Wholesale & retail | 1991 |
| Pauniemi Oy | Financial services | 1960 |
| Paupek-Kiinteistöt Oy | Real estate | 1997 |
| PeXa Oy | Health & social care | 2009 |
| Peakotek Oy | Manufacturing | 2013 |
| Pearl kiinteistöt Oy | Real estate | 2008 |
| PearlCon Oy | Professional & scientific | 2010 |
| Pectim Company Oy | Professional & scientific | 2012 |
| Peda Oy | Professional & scientific | 1986 |
| Pedant Oy | Health & social care | 2008 |
| Pedapuu Oy | Wholesale & retail | 2019 |
| Pedasus Oy | Professional & scientific | 2011 |
| Pedihealth Oy | Manufacturing | 1986 |
| Pegasus Chiropractic Oy | Health & social care | 2021 |
| Pehcon Oy | Professional & scientific | 2026 |
| Pehmoset Oy | Wholesale & retail | 2021 |
| Pehotech Oy | Professional & scientific | 2023 |
| Peili Vision Oy | Information & communication | 2015 |
| Peiset Oy | Real estate | 2022 |
| Pekan Eurohinnat Oy | Wholesale & retail | 2007 |
| Pekant Oy | Other services | 2006 |
| Pekka Kantola Oy | Administrative & support | 2015 |
| Pekka Ojala Oy | Construction | 2011 |
| Pekka Sakari Niemelä Consulting Oy | Wholesale & retail | 2016 |
| Pekkanen & Sutela avoin yhtiö | Wholesale & retail | 2025 |
| Pekuldo Oy | Education | 2025 |
| Pelecti Oy | Wholesale & retail | 2020 |
| Peli-Bunkkeri Oy | Hospitality | 2008 |
| Pelihalli Arcca Oy | Arts & recreation | 2026 |
| Peloe Oy | Real estate | 2018 |
| Peltikarhut Oy | Construction | 2007 |
| Peltisepänliike Peltec Oulu Oy | Manufacturing | 2024 |
| Peltisepänliike Satorex Oy | Construction | 2019 |
| Peltokurki Oy | Arts & recreation | 2022 |
| Peltoluomat Oy | Real estate | 2019 |
| Peltoniemi Promotion Oy | Arts & recreation | 2023 |
| Pena Trading Oy | Wholesale & retail | 2008 |
| Penan Panimo Oy | Manufacturing | 2021 |
| Pennin Hevonen Oy | Professional & scientific | 2008 |
| Pentose Biorefining Oy | Real estate | 2019 |
| Pentti Alkonen Oy | Real estate | 2018 |
| Pentti Kämäräinen Consulting Oy | Professional & scientific | 1994 |
| Pepin Aarre Oy | Wholesale & retail | 2009 |
| Pepron Collaboration Services Oy | Information & communication | 2017 |
| Pepron Software Services Oy | Information & communication | 2017 |
| PerPan Oy | Hospitality | 2023 |
| Perhekoti Säde Oy | Health & social care | 2019 |
| Perinteinen Puujalkakauppa Oy | Manufacturing | 2022 |
| Perintäpetteri Oy | Professional & scientific | 1996 |
| Pertti Heikkinen Ky | Construction | 1993 |
| Perttunen & Co. Oy | Construction | 2025 |
| Perttusoft Oy | Financial services | 2023 |
| Perustus Lehtola Oy | Construction | 2011 |
| Pesca Capital Oy | Financial services | 2026 |
| Pesukontti.fi Oy | Other services | 2024 |
| Pesukopla Oy | Other services | 2003 |
| Pete Invest Oy | Wholesale & retail | 2026 |
| Petere-Kiinteistöt Oy | Real estate | 1993 |
| Petri Kokko Oy | Professional & scientific | 2006 |
| Petropower Oy | Transport & logistics | 2024 |
| Petteri Ylikotila Oy | Professional & scientific | 2020 |
| Peurakoski & Kni Kommandiittiyhtiö | Wholesale & retail | 1957 |
| Pharmados Oy | Wholesale & retail | 2013 |
| Pharmatory Group Oy | Financial services | 2025 |
| Pharmatory Holding Oy | Financial services | 2025 |
| Pharmatory Oy | Manufacturing | 2000 |
| PhenomenAR Oy | Manufacturing | 2022 |
| Phithat Oy | Hospitality | 2020 |
| Phonocor Oy | Health & social care | 2021 |
| Phuket Oulu Oy | Hospitality | 2023 |
| Phuket Thai Ky | Hospitality | 2020 |
| Piatti Oy | Wholesale & retail | 2007 |
| PicFactor Oy | Professional & scientific | 2019 |