| Premind Oy | Professional & scientific | 2001 |
| Preoni Oy | Professional & scientific | 2009 |
| Priima Kiinteistökonsultointi Oy | Professional & scientific | 2015 |
| Priki Kiinteistöt Oy | Real estate | 2008 |
| Prima-rakentajat Oy | Construction | 2022 |
| Prime Authentication Solutions Finland Oy | Information & communication | 2017 |
| PrimeTec Oy | Construction | 2026 |
| Pro Kelpo Remontit Oy | Construction | 2021 |
| Pro Mate Ky | Construction | 2014 |
| Pro Tilaratkaisut Oy | Wholesale & retail | 2008 |
| ProBoreal Oy | Administrative & support | 2014 |
| ProMet Oy | Professional & scientific | 2018 |
| ProModules Oy | Construction | 2003 |
| ProReel Oy | Manufacturing | 2024 |
| Proam Capital Oy | Administrative & support | 2019 |
| Proam Vela Oy | Real estate | 2021 |
| Proasennus & Kuljetus Oy | Construction | 2020 |
| Probis Solutions Oy | Information & communication | 2003 |
| Procemex Oy | Manufacturing | 2000 |
| Productia Oy | Professional & scientific | 2009 |
| Prof Hair Design Oy | Other services | 2022 |
| Profilo Oy | Professional & scientific | 2026 |
| Profitea Oy | Professional & scientific | 2019 |
| Profitly Oy | Professional & scientific | 2020 |
| Proflycon Oy | Professional & scientific | 2020 |
| Projektinhallinta Proicere Oy | Real estate | 2023 |
| Projektipalvelu Erkki Jaala Oy | Professional & scientific | 2010 |
| Projektipalvelu Pietikäinen Oy | Real estate | 2021 |
| Projektipalvelu SPECPRO OY | Professional & scientific | 2006 |
| Projektitoimisto Heiga osk | Professional & scientific | 2021 |
| Projektitoimisto Leone osk | Professional & scientific | 2024 |
| Prokoti Kasvatuskumppanit Oy | Health & social care | 2016 |
| Promana Ltd Oy | Professional & scientific | 1996 |
| Promarket Oy | Real estate | 2004 |
| Promas Oy | Real estate | 2008 |
| Propa Oy | Construction | 2014 |
| Propellerhat Management Oy | Professional & scientific | 2015 |
| Prospectum Oy | Information & communication | 2010 |
| Protasanne Oy | Real estate | 2022 |
| Protech AD Services Oy | Professional & scientific | 2004 |
| Protemo Oy | Real estate | 2019 |
| Prowell oy | Arts & recreation | 2008 |
| Prowi Oy | Construction | 2016 |
| Proxel Oy | Wholesale & retail | 1996 |
| Prudentum Oy | Professional & scientific | 1999 |
| PsyDeco Oy | Health & social care | 2020 |
| Psykiatripalvelut Pekka Perämäki Oy | Health & social care | 2013 |
| Psykofyysinen valmennus Minhalla Oy | Arts & recreation | 2021 |
| Psykoharri Oy | Health & social care | 2022 |
| Psykologi, psykoterapeutti Linnove Oy | Health & social care | 2023 |
| Psykologi- ja työnohjauspalvelut Kirsi Parikka Oy | Health & social care | 2022 |
| Psykologipalvelu Huojennus Oy | Health & social care | 2022 |
| Psykologipalvelu Pauliina Oy | Health & social care | 2022 |
| Psykologipalvelu Puro Oy | Health & social care | 2023 |
| Psykologipalvelut Kemilä Oy | Health & social care | 2014 |
| Psykologipalvelut Kiukkonen Oy | Health & social care | 2025 |
| Psykologipalvelut Mieli ja Kuvitus Oy | Health & social care | 2016 |
| Psykoterapia Kati Mansikka-aho Oy | Health & social care | 2007 |
| Psykoterapia Mielessä Oy | Health & social care | 2022 |
| Psykoterapia Virtaava Mieli Oy | Health & social care | 2018 |
| Psykoterapiapalvelu Maarika Kaija oy | Health & social care | 2021 |
| Psykoterapiapalvelu Tuula Järvelin Oy | Health & social care | 2024 |
| Psyon Games Oy | Information & communication | 2013 |
| Ptvgym Jyväskylä Oy | Arts & recreation | 2017 |
| Puhdina Oy | Administrative & support | 2025 |
| Puheterapia Sanalähde Oy | Health & social care | 2016 |
| Puhiko Oy | Wholesale & retail | 1996 |
| Puhti Investment Oy | Administrative & support | 2022 |
| Puiko Oy | Real estate | 2022 |
| Puistokissa Oy | Hospitality | 1994 |
| Puiston Taksi Oy | Transport & logistics | 1994 |
| Pukuti Group Oy | Professional & scientific | 2007 |
| Pula-ajan pääoma oy | Financial services | 2018 |
| Pulkkinen & Päivärinta Omistukset Oy | Financial services | 2020 |
| Pulkkinen Omistukset Oy | Financial services | 2025 |
| Pulvan Oy | Professional & scientific | 2020 |
| PumppuPro Oy | Construction | 2024 |
| Punainen Kissa Oy | Real estate | 2023 |
| Punttiluola Oy | Arts & recreation | 2021 |
| Puotila Vaajakoski Oy | Wholesale & retail | 2018 |
| Puranen & Kiviluoto Invest Oy | Real estate | 2019 |
| Pure Cosmetics Finland Oy | Manufacturing | 2022 |
| Purilaan Parkki Oy | Real estate | 2004 |
| Purkuhuhta Oy | Construction | 2020 |
| Purus Everro Oy | Manufacturing | 2023 |
| Putki Pee Oy | Construction | 2020 |
| Putkityö Kovanen Oy | Construction | 2011 |
| Puusepänliike Astikainen Avoin yhtiö | Manufacturing | 2006 |
| Pyntom Oy | Financial services | 2026 |
| Pyrythekid Oy | Arts & recreation | 2023 |
| Pyörä ja Retkeily Pekka Kolari Ky | | 1989 |
| Päivän Isoilo OY | Health & social care | 2012 |
| PÄKup Oy | Health & social care | 2016 |
| Päijänne Group Oy | Administrative & support | 2022 |
| Päijänteen Aumakivi Oy | Real estate | 1998 |
| Päijänteen Partiopurjehdus Oy | Manufacturing | 2012 |
| Päijät-Kumi Oy | Wholesale & retail | 1991 |
| Päivölä Holdings Oy | Financial services | 2020 |
| Päivölä Investments Oy | Professional & scientific | 2024 |
| Pääkallo & hevonen Oy | Arts & recreation | 2025 |