| Pohjois-Suomen Pinnoitepalvelu Oy | Real estate | 1996 |
| Pohjois-Suomen Sähköinsinööritoimisto Oy | Professional & scientific | 1986 |
| Pohjois-Suomen Talotekniikka Oy | Construction | 2004 |
| Pohjois-Suomen Tiiviste Oy | Wholesale & retail | 2005 |
| Pohjois-Suomen Tilintarkastus Oy | Professional & scientific | 1985 |
| Pohjois-Suomen Toimitilat Oy | Real estate | 2019 |
| Pohjois-Suomen Tukipalvelu Oy | Health & social care | 2012 |
| Pohjois-Suomen sosiaali- ja terveydenhuollon osuuskunta | Health & social care | 2019 |
| Pohjoisen Laatu Oy | Wholesale & retail | 2019 |
| Pohjoisen Lakitalo Oy | Professional & scientific | 2023 |
| Pohjoisen Peltikeskus Oy | Construction | 2013 |
| Pohjoisen Sähkö ja Kiinteistö Oy | Construction | 2013 |
| Pohjoisen Sähkötek Oy | Construction | 2022 |
| Pohjoisen Talotekniikka Oy | Construction | 2025 |
| Pohjoisen Ultra Oy | Health & social care | 2018 |
| Pohjoisen Uusiutuva Energia Oy | Energy | 2023 |
| Pohjoisen kirjanpito Oy | Professional & scientific | 2025 |
| Pohjoisen panimo Maistila Oy | Financial services | 2015 |
| Pohjoisen raskaskonehuolto Oy | Other services | 2019 |
| Pohjoisenväri Oy | Construction | 2025 |
| Pohjoiskairan Auto Oy | Real estate | 1951 |
| Pohjoiskatto Oy | Construction | 2025 |
| Pohjolan 1 Autohuolto Oy | Other services | 2008 |
| Pohjolan Asbestityö Oy | Construction | 2017 |
| Pohjolan Autolataus Oy | Wholesale & retail | 2026 |
| Pohjolan Desinfiointi Oy | Administrative & support | 1991 |
| Pohjolan Eristystekniikka PET Oy | Construction | 2019 |
| Pohjolan Haittaeläintorjunta Oy | Administrative & support | 2025 |
| Pohjolan Hirsikoti Ky | Construction | 2011 |
| Pohjolan Kattopinnoitus Oy | Construction | 2024 |
| Pohjolan Kivitalo Oy | Wholesale & retail | 1991 |
| Pohjolan Kuitupojat Avoin yhtiö | Construction | 2012 |
| Pohjolan Kure-Rakennus Oy | Construction | 2007 |
| Pohjolan Lasi Oy | Other services | 1973 |
| Pohjolan Levypalvelu.fi Oy | Manufacturing | 2021 |
| Pohjolan Liiketilat Oy | Real estate | 1984 |
| Pohjolan Lomakiinteistöt Oy | Construction | 2006 |
| Pohjolan Osuuspankki | Financial services | 1915 |
| Pohjolan Palvelut Oy | Manufacturing | 1956 |
| Pohjolan Patologit Oy | Health & social care | 2015 |
| Pohjolan Pintamestarit Oy | Professional & scientific | 2000 |
| Pohjolan Rahoitus Oy | Financial services | 1982 |
| Pohjolan Rakentajat Oy | Real estate | 2019 |
| Pohjolan Service Oy | Administrative & support | 2019 |
| Pohjolan Siivous- ja Muuttopalvelut Oy | Administrative & support | 2020 |
| Pohjolan Sähkökontrolli Oy | Professional & scientific | 2008 |
| Pohjolan Tilityö Oy | Professional & scientific | 1985 |
| Pohjolan Turvapalvelut Oy | Professional & scientific | 1996 |
| Pohjolan W-Kiinteistöt Oy | Real estate | 2024 |
| Pohjolan-Forest Oy | Agriculture & fishing | 2011 |
| Pokaovi International Oy | Real estate | 1994 |
| Poko Oy - Pohjolan Koiravartiointi | Administrative & support | 1992 |
| Pokonet Oy | Real estate | 1997 |
| Polar Bounty Oy | Wholesale & retail | 2023 |
| Polar Doubler Ky | Manufacturing | 1990 |
| Polar Finance Oy | Professional & scientific | 2005 |
| Polar Forest Oy | Real estate | 1990 |
| Polar Group Oy | Construction | 2015 |
| Polar Management Oy | Professional & scientific | 1990 |
| Polar Security Oy | Administrative & support | 1996 |
| Polar Stage Oy | Financial services | 1985 |
| Polar Turkis Oy | Wholesale & retail | 2018 |
| Polar Vortex Consulting Oy | Information & communication | 2024 |
| Polar Work Service Oy | Transport & logistics | 2016 |
| Polar-Venture Oy | Financial services | 1987 |
| PolarSpine Oy | Health & social care | 2020 |
| Polaraudio Oy | Wholesale & retail | 1998 |
| Polarcon Oy | Professional & scientific | 1995 |
| Polarcount Oy | Professional & scientific | 2016 |
| Polarico Oy | Information & communication | 2012 |
| Polaris Infrastructure Partners Oy | Professional & scientific | 2026 |
| Polarline Oy | Transport & logistics | 2003 |
| Polarmit Oy | Construction | 2006 |
| Polarplan Ky | Wholesale & retail | 2012 |
| Polarvi Holding 1 Oy | Real estate | 2023 |
| Polarvi Oy | Real estate | 2000 |
| Polat Finland Oy | Hospitality | 2022 |
| Polento Oy | Arts & recreation | 2022 |
| Pollee Oy | Administrative & support | 2019 |
| PollenTech Oy | Information & communication | 2014 |
| Poluja-Saneeraus Oy | Construction | 1990 |
| Poly-Eristys Ky Kukkonen | | 1988 |
| Pommin Varma Oy | Arts & recreation | 2025 |
| Pomona Consulting Ky | Professional & scientific | 2015 |
| Ponkila Oy | Information & communication | 2017 |
| Pontus Group Oy | Professional & scientific | 2022 |
| Pop Up Yoga Finland Oy | Education | 2020 |
| Popos Oy | Administrative & support | 2024 |
| Populus Alba Oy | Financial services | 2023 |
| Porkan Huolto Ky | Administrative & support | 2007 |
| Porogrammer Oy | Information & communication | 2011 |
| Poropadel Areenat Oy | Arts & recreation | 2025 |
| Posantum Oy | Financial services | 2020 |
| Posion Sairaankuljetus Oy | Financial services | 2002 |
| Positive Partnerships Global Oy | Professional & scientific | 2022 |
| Positus Invest Oy | Real estate | 1993 |
| Postman Consulting Oy | Financial services | 2018 |
| Potnis Oy | Manufacturing | 2025 |
| Power Dudes Oy | Administrative & support | 2026 |
| Power Flip Oy | Information & communication | 2024 |