| Psykoterapia ja ohjaus Mielen satamat Oy | Health & social care | 2025 |
| Psykoterapiapalvelu Kakko Oy | Health & social care | 2022 |
| Psykoterapiapalvelu M. Jalkanen Oy | Health & social care | 2019 |
| Psykoterapiapalvelu Tukikohta Oy | Health & social care | 2018 |
| Psykoterapiapalvelut Anna-Riikka Valve Oy | Health & social care | 2026 |
| Psykoterapiapalvelut Maria Lepola Oy | Health & social care | 2025 |
| Psykoterapiapalvelut Minna Björkqvist Oy | Health & social care | 2021 |
| Psykoterapiapalvelut Nahkiaisoja Oy | Health & social care | 2023 |
| Psylink Oy | Health & social care | 2024 |
| Pub Aukionkulma Oy | Hospitality | 1991 |
| Pubiaika Oy | Hospitality | 2011 |
| Puhdas Maku Oy | Hospitality | 2026 |
| Puheen puro Oy | Health & social care | 2013 |
| Puhelox Oy | Health & social care | 2026 |
| Puhesuo Oy | Health & social care | 2023 |
| Puheterapia Kukkuluuru Oy | Health & social care | 2026 |
| Puheterapiapalvelu Kalevan Puhe Oy | Health & social care | 2025 |
| Puhetta Oy Suomi | Health & social care | 2020 |
| Puhna Oy | Administrative & support | 2022 |
| Puhommies Oy | Construction | 2022 |
| Puhtitahti Oy | Professional & scientific | 2023 |
| Puistikko Consulting Oy | Information & communication | 2021 |
| Puistola Properties Oy | Real estate | 2025 |
| Puistolinna Invest Oy | Professional & scientific | 2020 |
| Pukimo Majaranta Ky | Wholesale & retail | 1955 |
| Pukkila Housing Oy | Real estate | 2022 |
| Pukuvuokraamo Kavaljeeri Oy | Administrative & support | 2017 |
| Pulcinella Ravintolat Oy | Hospitality | 2024 |
| Pulimato Records Oy | Arts & recreation | 2019 |
| Pulinat Pois Oy | Professional & scientific | 2024 |
| Pulju Malminetsintä Oy | Mining & quarrying | 2020 |
| Pulmo Oy | Health & social care | 2024 |
| Pulse Craft Oy | Manufacturing | 2026 |
| Pulsedeon Oy | Professional & scientific | 2018 |
| Pulssi-invest Oy | Real estate | 2011 |
| Pumari Oy | Transport & logistics | 2025 |
| Pump-Mix Nord Oy | Transport & logistics | 2009 |
| Pumppuposse Oy | Construction | 2024 |
| Punainen Omena Oy | Financial services | 2019 |
| Punaiset langat Oy | Arts & recreation | 2008 |
| Punjab Kebab Oy | Hospitality | 2000 |
| Punkkubaari 931 Oy | Hospitality | 2025 |
| Punnala Invest Oy | Financial services | 2010 |
| Punos Creation Oy | Other services | 2023 |
| Punos Finland Oy | Education | 2024 |
| Puntano Oy | Real estate | 1997 |
| Puolimatka Services Oy | Information & communication | 2008 |
| Puranen Capital Oy | Financial services | 2023 |
| Puranen Invest Oy | Financial services | 2016 |
| Pure Invest Oy | Hospitality | 2024 |
| Pure Nordic Union Tuki Oy | Professional & scientific | 2024 |
| Pure Recycle Oy | Water & waste | 2019 |
| Pure Wild Nature Oy | Wholesale & retail | 2021 |
| PureStore Oy | Wholesale & retail | 2015 |
| Purebite Oy | Hospitality | 2006 |
| Purely Personal Oy | Education | 2025 |
| Puro Invest Oy | Real estate | 2023 |
| Puro Productions Oy | Information & communication | 2024 |
| Puro Studio Oy | Wholesale & retail | 2026 |
| Puronurmi Partners Oy | Professional & scientific | 2025 |
| Purotilit Oy | Professional & scientific | 2018 |
| Purple Moon Oy | Wholesale & retail | 1996 |
| PuruBois Oy | Agriculture & fishing | 2020 |
| Putkarin Poika Oy | Construction | 2010 |
| Putkeen Oy | Construction | 2019 |
| Putki TuPa Oy | Construction | 2012 |
| PutkiAki Oy | Construction | 2021 |
| Putkiasennus Matti Suikki Ky | Construction | 2008 |
| Putkiasennus Oikarainen Oy | Construction | 2016 |
| Putkiasennus Seppälä Oy | Construction | 1993 |
| Putkikuningas Oy | Construction | 1998 |
| Putkiliike Muhvi ja Putki Oy | Construction | 2003 |
| Putkityö Kivekäs Oy | Construction | 2022 |
| Putkiwelho Oy | Construction | 2022 |
| Putkos Experience Oy | Financial services | 2021 |
| Puu & Betoni avoin yhtiö | Construction | 2013 |
| Puuateljee Blok Oy | Real estate | 2004 |
| Puuhatoimi Oy | Arts & recreation | 1990 |
| Puuhuu Oy | Health & social care | 2025 |
| Puukkoniemi Ky | Wholesale & retail | 1957 |
| Puumalan Lakiasiaintoimisto Ky | Professional & scientific | 1990 |
| Puurauhala Oy | Construction | 2013 |
| Puusepänliike Lauri-Poika Oy | Construction | 2007 |
| Puusepänliike Osmo Virta Oy | Manufacturing | 1990 |
| Puutarhakadun Toimistot Oy | Real estate | 1987 |
| Puutarhurin Maja Oy | Wholesale & retail | 2017 |
| Puutenhiälä Oy | Real estate | 2022 |
| Puuton Oy | Real estate | 2020 |
| Puutyö Ronkainen Oy | Construction | 2022 |
| Puutyöliike Ojanen Oy | Manufacturing | 1989 |
| Puuwaara Oy | Manufacturing | 2025 |
| Pyhä Igloos Oy | Hospitality | 1989 |
| Pyhän Kiinteistöhuolto Oy | Administrative & support | 2023 |
| Pyhätunturin Vuokramökit Mattsson Oy | Hospitality | 1999 |
| Pynich Pine Advisors Oy | Financial services | 2025 |
| Pyradimn Oy | Arts & recreation | 2023 |
| Pyroll Pakkaukset Oy | Manufacturing | 2017 |
| Pyry Rouvila Oy | Information & communication | 2022 |
| Pyrypoika Oy | Hospitality | 2021 |
| Pytsy & Mo Oy | Professional & scientific | 2024 |