| Oy Tyri Finland Ab | Wholesale & retail | 2011 |
| Oy Uniflex Ab | Wholesale & retail | 1980 |
| Oy Villanella Ab | Professional & scientific | 1967 |
| Oy Wildosta Ab | Financial services | 1974 |
| Oy Witwo Ab | Financial services | 1985 |
| Oy elbas Ab | Professional & scientific | 2006 |
| PB-Paintball öppet bolag | Wholesale & retail | 2015 |
| PIA SN FINANS Ab | Financial services | 2021 |
| PMB Invest Ab | Real estate | 2012 |
| PROMICAL Oy Ab | Wholesale & retail | 1996 |
| PRS Partners Ab Oy | Professional & scientific | 2017 |
| Padelia Life Oy | Arts & recreation | 2020 |
| Pakkasmestarit Oy | Construction | 2012 |
| Pamilla Clean öppet bolag | Administrative & support | 2025 |
| Parturi-Kampaamo Star Jaana & Tuija avoin yhtiö | Other services | 2005 |
| Patentic Oy Ab | Professional & scientific | 2014 |
| Paulima Ab Oy | Professional & scientific | 2023 |
| Pausa Självbetjäningsskåp Ab | Wholesale & retail | 2025 |
| Pavis Oy Ab | Hospitality | 2020 |
| Pedekyl Oy | Wholesale & retail | 2007 |
| Pedersöre Hantverksbryggeri Ab | Manufacturing | 2014 |
| Pelago tech Ab | Construction | 2019 |
| Perez Corchado & Havinen Palvelut Avoin Yhtiö | Hospitality | 2012 |
| Pergite Ab Oy | Financial services | 2018 |
| Pettsson Coaching Ab | Arts & recreation | 2016 |
| PicBooster Ab | Professional & scientific | 2019 |
| Picolux Oy | Manufacturing | 1989 |
| Pietarsaaren G-Rengas Oy | Wholesale & retail | 1987 |
| Pietarsaaren Hautakivipalvelu Oy | Wholesale & retail | 2026 |
| Pietarsaaren Keramiikka Oy | Wholesale & retail | 2000 |
| Pietarsaaren Kolarikorjaus Oy | Other services | 1987 |
| Pietarsaaren Market-Flowers Oy | Wholesale & retail | 2007 |
| Pietarsaaren Mega Cars Oy/ Jakobstads Mega Cars Ab | Wholesale & retail | 1996 |
| Pietarsaaren Musiikki Ky | Wholesale & retail | 1987 |
| Pietarsaaren TV-Store Oy | Wholesale & retail | 1994 |
| Pietarsaaren Talonmiespalvelu Oy | Administrative & support | 1995 |
| Pietarsaaren Tankkihitsaus Ky | Manufacturing | 1981 |
| Pietarsaaren Urheiluvaruste, avoin yhtiö | Wholesale & retail | 1986 |
| Pietarsaaren Vanha Valimo Oy | Real estate | 1990 |
| Pinecraft Oy | Wholesale & retail | 1998 |
| Pirilö Västra Vattenandelslag | Water & waste | 2004 |
| Pirkon Pirssi Oy | Transport & logistics | 2009 |
| Pizza Catch Holding Oy | Financial services | 2025 |
| Platinum Carwash & Detailing Ab | Other services | 2023 |
| Platrium Oy | Real estate | 2024 |
| Pohjanmaan Raksapojat Oy | Construction | 2019 |
| Pohjanmaan Teknillinen Suunnittelu Oy-Österbottens Tekniska | Professional & scientific | 1984 |
| Pohrak Oy | Construction | 2012 |
| Point Marine Consulting Ab | Professional & scientific | 1999 |
| Poket World Öppet bolag | Professional & scientific | 2008 |
| Poleton Ab | Construction | 2023 |
| Poolspa Oy Ab | Wholesale & retail | 2024 |
| Portin Service Ab | Real estate | 2026 |
| PostureFix Ab | Other services | 2024 |
| Prewel Oy | Manufacturing | 2003 |
| Priima Siivouspalvelu & Laminointi avoin yhtiö | Administrative & support | 2011 |
| Prime Production Marketing Ab | Professional & scientific | 2022 |
| Prime works oy | Administrative & support | 2021 |
| Print & Package Group Oy | Manufacturing | 2021 |
| Pro Motion Annika Rak Oy Ab | Professional & scientific | 2019 |
| Professional Cleaning Service PCS Ab Oy | Administrative & support | 2005 |
| Proxis Oy | Health & social care | 2003 |
| Ps fastigheter Ab | Real estate | 2021 |
| Psykolog Rebecca Taylor Ab | Health & social care | 2022 |
| Pälsfarm, inneh. Kenneth Löfs & Co | Agriculture & fishing | 1980 |
| Pörkenäs vattenandelslag | Water & waste | 2026 |
| Pörkenäs-Storsand Vattenandelslag | Water & waste | 1998 |
| Q-Berry Oy Ltd | Wholesale & retail | 2018 |
| Q-staff Oy | Administrative & support | 2021 |
| QC-Invest Oy | Professional & scientific | 1990 |
| QC-Palvelu Oy | Professional & scientific | 2003 |
| QR Memories Ab | Information & communication | 2024 |
| Qlick PiQ Ab | Transport & logistics | 2023 |
| R & J Appelgren Oy | Wholesale & retail | 2005 |
| R Wallendahl Kb | Wholesale & retail | 1987 |
| R. Lindgren Ab | Professional & scientific | 2021 |
| R. N. R Fastigheter Ab | Real estate | 1996 |
| R8 Roadhouse Ab | Hospitality | 2012 |
| RCN Power Ab | Construction | 2021 |
| RE Motors Oy Ab | Other services | 2007 |
| RH Holding Ab | Financial services | 2024 |
| RHM Canbest Ab | Financial services | 1994 |
| RHS Holding Oy Ab | Real estate | 2023 |
| RHS Invest Ab | Real estate | 2022 |
| RM Tuonti Oy | Wholesale & retail | 2022 |
| RNVL Core Oy | Professional & scientific | 2025 |
| RNVL Holding Oy | Professional & scientific | 2025 |
| RP-Economia Oy | Administrative & support | 1994 |
| RT Machine Ab | Administrative & support | 2019 |
| Raho Ab Oy | Hospitality | 2020 |
| Raidimode Oy | Financial services | 2021 |
| Raiquity Holding Ab | Financial services | 2025 |
| Rakennuspalvelu T. Örn Oy | Construction | 2016 |
| Ratafemma Oy Ab | Arts & recreation | 2025 |
| Rautavarasto Saarinen Oy | Wholesale & retail | 1965 |
| Ravcon Oy | Construction | 2022 |
| RediBikes Ab | Wholesale & retail | 2020 |
| Refu Ab Oy | Real estate | 2019 |
| Rehab Invest Oy | Professional & scientific | 1990 |
| Rekry Staff Ab | Administrative & support | 2021 |