| Power Instruments Oy | Construction | 1991 |
| Power Mökit Oy | Real estate | 1989 |
| PowerFlow Studio Oy | Arts & recreation | 2022 |
| Powerbread Oy | Manufacturing | 2011 |
| Pramell Oy | Information & communication | 2021 |
| Precond Oy | Information & communication | 2006 |
| Prelux Oy | Wholesale & retail | 1991 |
| Prepon Oy | Real estate | 2018 |
| Priatos Oy | Information & communication | 1997 |
| Priddy Amber Finland Oy | Hospitality | 2026 |
| Priddy Amber GmbH, Suomen sivuliike | Real estate | 2025 |
| Primavera Digital Group Oy | Professional & scientific | 2020 |
| Printical Oy | Manufacturing | 2025 |
| Prizztech Asiantuntijapalvelut Oy | Professional & scientific | 1990 |
| Prizztech Oy | Professional & scientific | 1989 |
| Pro TL Oy | Professional & scientific | 2022 |
| Pro-Hewa Ab | Wholesale & retail | 1993 |
| ProAP Automaatiopalvelut Oy | Professional & scientific | 2014 |
| Proense Investment Oy | Financial services | 2022 |
| Proense Oy | Professional & scientific | 2016 |
| Profinor Invest Oy | Financial services | 1987 |
| Progant Oy | Professional & scientific | 2016 |
| Project House BoatHill Oy | Professional & scientific | 2018 |
| ProjectPal Oy | Professional & scientific | 2021 |
| Projectoff Oy | Professional & scientific | 1990 |
| Projektirakentajat JK Oy | Construction | 2015 |
| Prolog Oy | Professional & scientific | 2016 |
| Promica Vanerit Oy | Wholesale & retail | 2002 |
| Promika Oy | Transport & logistics | 2021 |
| Propes Oy | Financial services | 2017 |
| ProsManC Oy | Professional & scientific | 2020 |
| Proudly Production Ltd Oy | Education | 1997 |
| Provac oy | Administrative & support | 2024 |
| Provecon Oy | Professional & scientific | 2012 |
| Provendor Oy | Professional & scientific | 2002 |
| Przedsiebiorstwo Hompol Spolka z Ograniczona Odpowiedzialnoscia Sivuliike Suomessa | Construction | 2012 |
| Psykoanalyysi Sami Salminen Oy | Health & social care | 2018 |
| Psykologipalvelu Ehta Oy | Health & social care | 2024 |
| Psykologipalvelu Tyyni Tovi Oy | Health & social care | 2025 |
| Psykoterapia Krista Vepsä Oy | Health & social care | 2021 |
| Psykoterapia- ja koulutuskeskus Puuvilla Oy | Health & social care | 2006 |
| PsykoterapiaLithovius Oy | Health & social care | 2026 |
| Psykoterapiapalvelu Merituuli Oy | Health & social care | 2015 |
| Psykoterapiapalvelu Susan Tuominen Oy | Health & social care | 2023 |
| Puck Agency Finland Oy | Professional & scientific | 2008 |
| Puheilo Oy | Health & social care | 2022 |
| Puhto Auto Oy | Other services | 2025 |
| Purkukolmio Oy | Construction | 1997 |
| Purkupiha Asbestityöt Pori Oy | Professional & scientific | 2012 |
| Purolan Kiinteistöpalvelut Oy | Administrative & support | 2024 |
| Putiikki Brivatar Ky | Wholesale & retail | 1975 |
| Putki Tare Oy | Construction | 2017 |
| PutkiMarre Oy | Construction | 2024 |
| Putkiasennus Haapala Oy | Construction | 2025 |
| Putkistopalvelu Laakso Oy | Construction | 1989 |
| Puu Markku Oy | Wholesale & retail | 1994 |
| Puujanne Ky | Wholesale & retail | 1980 |
| Puutavaraliike A Leppijoki Ky | Wholesale & retail | 1982 |
| Puutyö Alander Oy | Construction | 2007 |
| PynnTech Oy | Construction | 2020 |
| Pysähdy Oy | Education | 2022 |
| Pyyrla Oy | Wholesale & retail | 2001 |
| Pyöräliike Pyörä Sport Oy | Wholesale & retail | 2019 |
| Päivi Lähteenmäki Ky | Hospitality | 1999 |
| Pälkäneen Vaahtera Oy | Real estate | 1998 |
| Pöytyän Taksi Oy | Transport & logistics | 2018 |
| QAQC Laaturatkaisut Oy | Professional & scientific | 2025 |
| Qualifinn Oy | Professional & scientific | 2007 |
| Quiet Invest Oy | Professional & scientific | 2008 |
| R & R Foods Oy | Hospitality | 2018 |
| R&J Pakastus ja Varastointi Oy | Manufacturing | 2008 |
| R&K Katot Oy | Construction | 2021 |
| Racma OY | Construction | 2013 |
| Raivaus Ja Urakointi J&J Ky | Agriculture & fishing | 2009 |
| RJJ Invest Oy | Real estate | 2018 |
| RJV-Yhtiöt Oy | Professional & scientific | 2019 |
| RK-Works Oy | Construction | 2023 |
| RKL Ruoka Oy | Wholesale & retail | 2023 |
| RKW Finland Oy | Manufacturing | 2000 |
| RMB Rock My Business Oy | Professional & scientific | 2011 |
| RMK Rent Oy | Construction | 2008 |
| RR Housing Oy | Health & social care | 2022 |
| RS KartRacing Oy | Arts & recreation | 2020 |
| RSF Village Oy | Hospitality | 2018 |
| Raatihuoneen Kellari Avoin yhtiö | Hospitality | 1991 |
| RadFox Oy | Information & communication | 2012 |
| Radio- ja TV-Huolto Matti Vilhola Ky | Other services | 1982 |
| Ragnarök Oy | Professional & scientific | 2022 |
| Rahe Rakennus Oy | Construction | 2022 |
| Rahola Engineering Oy | Professional & scientific | 2018 |
| Raikas Kemikaali Oy | Other services | 2020 |
| Raili Mäkelä Oy | Wholesale & retail | 1993 |
| RaitaKatto Oy | Construction | 2026 |
| Rajalantien Pysäköinti Oy | Real estate | 2017 |
| Rajamäen Kuormaus Oy | Construction | 1997 |
| Rak P S R Ky | Construction | 2006 |
| RakConsult Oy | Professional & scientific | 2005 |
| Rakcia Oy | Construction | 2018 |
| Rakennus & Saneeraus Heino Oy | Construction | 2020 |
| Rakennus J. Nieminen Oy | Construction | 2020 |