| PMJ Holding 2 Oy | Financial services | 2026 |
| PMJ Holding Oy | Professional & scientific | 2025 |
| Prinssimaku OY | Arts & recreation | 2015 |
| PROGON Oy | Professional & scientific | 2023 |
| PTJ-Group Oy | Other services | 2014 |
| Paattimaakarit Oy | Manufacturing | 1987 |
| Pajavirta Oy | Professional & scientific | 2014 |
| Palovuoren Kivi Oy | Mining & quarrying | 1996 |
| Palsalan vesiosuuskunta | Water & waste | 2010 |
| Palvan-Hempsaaren vesiosuuskunta | Water & waste | 2023 |
| Palvelukoti Kuusela Oy | Professional & scientific | 1986 |
| Panasonic Avionics Corporation, Suomen Sivuliike | Manufacturing | 2012 |
| Pappila & Penkkala Oy | Financial services | 1994 |
| Papu Group Oy | Manufacturing | 2025 |
| Paraisten Ponnistus Oy | Real estate | 2021 |
| Parketti Snällström Oy | Construction | 1982 |
| ParkettiPalvelu Suvitie Oy | Construction | 2018 |
| Parvelle Palvelut Oy | Professional & scientific | 2025 |
| Pasalan Huolto Oy | Administrative & support | 2011 |
| Patax Oy | Real estate | 1993 |
| Paxteam Material Oy | Professional & scientific | 2018 |
| Pelicat Oy | Construction | 2002 |
| Pelipeikko Oy | Wholesale & retail | 2017 |
| Peltolan LVI-Huolto Oy | Construction | 1993 |
| Perpomo Oy | Financial services | 2019 |
| Pete Eristys Oy | Construction | 2020 |
| Petrox Solutions Oy | Construction | 2018 |
| Petteri Leino Oy | Hospitality | 2011 |
| Pevemat Oy | Manufacturing | 1995 |
| Picassos Design Oy | Manufacturing | 2016 |
| Picassos Oy | Construction | 2017 |
| Piero Bll Oy | Manufacturing | 2020 |
| PihaRoiha Oy | Administrative & support | 2021 |
| Pingster Oy | Hospitality | 1984 |
| Pipel Oy | Manufacturing | 2017 |
| Pippu Hoblaa Oy | Financial services | 2026 |
| Pippurinen Kustannus Oy | Information & communication | 2019 |
| Pirjon Pakari Raisio Oy | Wholesale & retail | 2019 |
| Pixed Creative Oy | Professional & scientific | 2011 |
| Pizza Volante Oy | Hospitality | 1986 |
| PlankTones Oy | Information & communication | 2025 |
| Planzibar Oy Ab | Wholesale & retail | 2020 |
| Platinum Swing Oy | Real estate | 2016 |
| Playa Del Raisio Vesipuisto Oy | Arts & recreation | 2026 |
| Playmaker 92 Oy | Arts & recreation | 2020 |
| Plus Katsastus Etelä-Pohjanmaa Oy | Professional & scientific | 2022 |
| Plus Katsastus Kajaani Oy | Professional & scientific | 2021 |
| Plus Katsastus Kuopio Oy | Professional & scientific | 2021 |
| Plus Katsastus Oy | Professional & scientific | 2010 |
| Plus Katsastus Pohjois-Pohjanmaa Oy | Professional & scientific | 2022 |
| Plus Katsastus Turku Oy | Professional & scientific | 2011 |
| Pofos Oy | Construction | 1981 |
| Poika & Poika Holding Oy | Financial services | 2025 |
| Polynet Oy | Construction | 2021 |
| Porin Hydrohalli Oy | Real estate | 1988 |
| Poutapolku Oy | Health & social care | 2020 |
| Powerduo Oy | Wholesale & retail | 2022 |
| Powermotion Oy | Wholesale & retail | 2023 |
| Preclinapps Oy | Professional & scientific | 2014 |
| Primapalvelu-JT Oy | Administrative & support | 1988 |
| Pro Detailing Turku Oy | Other services | 2022 |
| ProDrill Oy | Construction | 2013 |
| ProPera Oy | Construction | 2024 |
| Procurum Oy | Professional & scientific | 2016 |
| Proerp Oy | Professional & scientific | 2022 |
| Projektikuutio Oy | Professional & scientific | 2007 |
| Prosessipalvelu M. Potinkara Oy | Professional & scientific | 1993 |
| Prowine Oy | Education | 2016 |
| Psygnosis Limited, Finnish Branch | Information & communication | 2025 |
| Puoticom Oy | Wholesale & retail | 2019 |
| Puutuote Pliki Oy | Manufacturing | 1996 |
| Puutyöliike Rasi Oy | Manufacturing | 2007 |
| Pyramids ravintola Oy | Hospitality | 2022 |
| Pyykkiralli Oy | Other services | 2022 |
| Quick-Kaluste Oy | Construction | 2015 |
| R. M. Laine Oy | Transport & logistics | 1990 |
| R.N Ship Work Oy | Manufacturing | 2020 |
| R.Salovuori Oy | Professional & scientific | 2022 |
| RA-Service Oy | Construction | 2011 |
| RP-Taksi Oy | Transport & logistics | 2010 |
| RS Nurminen Oy | Administrative & support | 1990 |
| RV-Kiinteistöt Oy | Real estate | 1989 |
| RaJu Invest Oy | Real estate | 2026 |
| RaSaSi Oy | Construction | 2002 |
| Rag Rag Oy | Wholesale & retail | 1987 |
| Raiko Oy | Manufacturing | 1992 |
| Raikon Konepaja Oy | Manufacturing | 1982 |
| Rairohdos Oy | Wholesale & retail | 2016 |
| Raisio Newco Oy | Real estate | 2026 |
| Raisio Oyj | Administrative & support | 1987 |
| Raisio Ravintolat Oy | Hospitality | 2001 |
| Raisio Service Oy | Administrative & support | 2022 |
| Raisio impex Oy | Wholesale & retail | 2024 |
| Raision Autohuolto Oy | Other services | 2019 |
| Raision Autolasi Oy | Manufacturing | 2013 |
| Raision EKA-Sähkö Oy | Construction | 2008 |
| Raision Herkku Oy | Hospitality | 2016 |
| Raision Hitsaustarvike ja Huolto Oy | Manufacturing | 2009 |
| Raision Hulevesi Oy | Water & waste | 2023 |
| Raision Isännöintipalvelu Oy | Real estate | 2009 |