| PAR Palvelut Oy | Health & social care | 2025 |
| PBR Teollisuus Oy | Construction | 2013 |
| PEP Holding Oy | Professional & scientific | 2023 |
| PH Finance Oy | Financial services | 2024 |
| PH-Company Oy | Wholesale & retail | 2022 |
| PH-Rent Oy | Wholesale & retail | 2014 |
| PHR Maanrakennus Oy | Construction | 2018 |
| Pink Seinäjoki OY | Other services | 2008 |
| PK Installation Oy | Manufacturing | 2026 |
| PLK Catering & IT Oy | Hospitality | 2021 |
| PM-Pizza Oy | Hospitality | 2012 |
| PN Minea Oy | Health & social care | 2017 |
| POWER-Puhdistus Oy | Administrative & support | 2020 |
| PP Klinikka Oy | Health & social care | 2025 |
| PP Maanrakennus Oy | Construction | 2011 |
| PP Rahti Oy | Transport & logistics | 2020 |
| PP iac Oy | Professional & scientific | 2020 |
| PPK Nordic Oy | Construction | 2020 |
| PPS Palaveri Oy | Hospitality | 2011 |
| PR Green Invest Oy | Professional & scientific | 2024 |
| PRP Solutions Oy | Manufacturing | 2006 |
| PSS-Trade Oy | Real estate | 1991 |
| PTH Capital Oy | Financial services | 2025 |
| PTS-Rakennus Oy | Construction | 2006 |
| Paavo Rintamäki Ky | Real estate | 1980 |
| Paavo ja Maija Toppari Kiinteistöt Oy | Real estate | 2022 |
| Padel or Coffee Oy | Hospitality | 2019 |
| Padel or Die Arctic Oy | Arts & recreation | 2021 |
| Padel or Die! Oy | Arts & recreation | 2019 |
| PaikanPäällä Kiinteistöpalvelut Oy | Administrative & support | 2025 |
| Paikkari Solutions Oy | Professional & scientific | 2025 |
| Painokeskus ProPrint Oy | Manufacturing | 1993 |
| Painopalvelu Tuulensuu Ky | Manufacturing | 1986 |
| Paita-Baari Oy | Wholesale & retail | 1961 |
| Pajkka Oy | Real estate | 2023 |
| Pakt Seinäjoki Oy | Administrative & support | 2008 |
| Paloff Insinööritoimisto Oy | Real estate | 2011 |
| Pancho Villa Finland Oy | Administrative & support | 2009 |
| Pannun Lämpö Oy | Hospitality | 2026 |
| Panostus Pekka Saarela Oy | Construction | 2000 |
| Pantero Holding Oy | Financial services | 2022 |
| Panu Group Oy | Professional & scientific | 2019 |
| Papinpolun kodit Oy | Real estate | 2020 |
| Papun Verstas Oy | Wholesale & retail | 2023 |
| Parasto Oy | Wholesale & retail | 2016 |
| Park Invest Oy | Real estate | 2006 |
| Parkanon Oma Koti Oy | Real estate | 2014 |
| Parkkipirtti, avoin yhtiö | Financial services | 2001 |
| Partman Oy | Professional & scientific | 2023 |
| Parturi-Kampaamo Cut Point Ky | Other services | 1998 |
| Parturi-Kampaamo Florentia Oy | Other services | 2012 |
| Parturi-Kampaamo Hiuspuoti Kytöharju avoin yhtiö | Other services | 1995 |
| Parturi-Kampaamo Studio S Avoin Yhtiö | Other services | 2013 |
| Passo Prossimo Oy | Wholesale & retail | 2002 |
| Peaceland Oy | Professional & scientific | 2021 |
| Peasy Gig Oy | Information & communication | 2023 |
| Pegasso Oy | Professional & scientific | 2008 |
| PekHel Oy | Hospitality | 2018 |
| Pekan Maalaus Oy | Construction | 2018 |
| Peltisepänliike Karjala Oy | Construction | 2020 |
| Peltokangas Oy | Real estate | 1988 |
| PenCom Oy | Professional & scientific | 2023 |
| Penninääri Oy | Real estate | 1989 |
| Performance for Life Oy | Arts & recreation | 2015 |
| Perhepalvelukeskus Kotisatama Oy | Health & social care | 2023 |
| Perintäritari Oy | Administrative & support | 1996 |
| Peroco Invest Oy | Real estate | 2024 |
| Pertek Ky | Wholesale & retail | 1987 |
| Perälä Engineering Oy | Manufacturing | 2019 |
| Perän Timpurit Oy | Construction | 1976 |
| Pesalle Oy | Hospitality | 2009 |
| Petaha Oy | Wholesale & retail | 2012 |
| Peumet Oy | Manufacturing | 2007 |
| Pharmacuro Oy | Wholesale & retail | 2016 |
| Photogenic Oy | Professional & scientific | 1996 |
| Piccola-Import Oy | Wholesale & retail | 2023 |
| Pickpack Oy | Wholesale & retail | 2001 |
| Pienkone- ja Moottorihuolto J. Saranpää Oy | Other services | 2013 |
| Pienkonehuolto R Alanen Ky, seur. | Other services | 1994 |
| Pihanrakennus Valo Ky | Construction | 2011 |
| Piirin Eläinklinikka Oy | Professional & scientific | 2022 |
| Piirin Pysäköinti Oy | Real estate | 2023 |
| Piirinmestari Oy | Construction | 2021 |
| Piisami Levyt Oy | Wholesale & retail | 2016 |
| Pilvisofta Oy | Information & communication | 2024 |
| Pink2 Oy | Other services | 2019 |
| Pinotili Ky | Professional & scientific | 2004 |
| Pionitar Oy | Wholesale & retail | 2020 |
| Piparizzi Oy | Wholesale & retail | 1995 |
| Pirjon Pakari Seinäjoki Oy | Manufacturing | 2009 |
| Pirjon Pakarin Konditoria Raisio Oy | Hospitality | 2023 |
| Pirjon Pakarin Konditoria Ylivieska Oy | Hospitality | 2023 |
| Pirjon Tili- ja taloushallintopalvelu Ky | Professional & scientific | 2017 |
| Pisar Invest Oy | Financial services | 2013 |
| Pizza Valentina Oy | Hospitality | 2026 |
| Plan View Oy | Professional & scientific | 2017 |
| Plannect Oy | Administrative & support | 2022 |
| Plannia Oy | Professional & scientific | 2008 |
| Plastiikkakirurgipalvelu Halonen Oy | Health & social care | 2020 |
| Pohjamestarit Oy | Construction | 1989 |