| Paulrak Oy | Construction | 2015 |
| Peak Media Aspen Ky | Professional & scientific | 2016 |
| Pekka Perttula Consulting Oy | Professional & scientific | 2013 |
| Pelleriini Oy | Manufacturing | 2020 |
| Pellisen Herkku Oy | Wholesale & retail | 1990 |
| People Tech Consulting Oy | Professional & scientific | 2023 |
| Pepinokirkkonummi Oy | Hospitality | 2023 |
| Peppino Kirk Oy | Hospitality | 2026 |
| Perhekoti Anna & Matti Oy | Health & social care | 2015 |
| Peruspalvelu Oy | Information & communication | 1977 |
| Petteri Holmberg Oy | Construction | 2005 |
| Petterik Oy | Information & communication | 2019 |
| Peuramaa Ski Oy | Arts & recreation | 1995 |
| Peveka Oy | Real estate | 1996 |
| Pics and Sport United Oy | Professional & scientific | 2017 |
| Pieneläinklinikka Veterica Oy | Professional & scientific | 2011 |
| Piisähkö Oy | Construction | 2022 |
| Pikkalan Autokorjaamo Oy | Other services | 2019 |
| Pink Hippo Oy | Wholesale & retail | 2015 |
| Piomal Oy | Administrative & support | 2010 |
| Pirjo & Annikki Oy | Administrative & support | 1987 |
| Pivard Consulting Oy | Professional & scientific | 2011 |
| PlayMyStrategy Oy | Professional & scientific | 2020 |
| Podiumm Oy | Wholesale & retail | 2010 |
| Pohjoinen Juurivoima Oy | Wholesale & retail | 2017 |
| Point of Contact Denmark ApS, Suomen sivuliike | Professional & scientific | 2025 |
| Polarpoltin Oy | Administrative & support | 1971 |
| PoolFix Finland Oy | Water & waste | 2025 |
| Porauspalvelut Malmsten Oy | Construction | 2023 |
| Porkkala Promotion Oy | Administrative & support | 2009 |
| Porkkala Trading Oy | Financial services | 2022 |
| Porkkala adventures oy | Arts & recreation | 2023 |
| Porkkalan Auto Oy | Wholesale & retail | 2010 |
| Porkkalan Kiinteistöhoito Oy | Administrative & support | 2025 |
| Porkkalan LVI-Palvelu Oy | Construction | 2015 |
| Porkkalan Marina Oy | Hospitality | 2020 |
| Porkkalan Sähkö- ja Kaivuupalvelut Oy | Construction | 2019 |
| Porkkalan Valo Oy | Professional & scientific | 2005 |
| Porkkalan raivauspalvelu Oy | Administrative & support | 2019 |
| Porkkalanranta Resort Oy | Real estate | 2025 |
| Portico Helsinki Avoin yhtiö | Professional & scientific | 1980 |
| Potus Oy | Hospitality | 2019 |
| Powerbrown Oy | Wholesale & retail | 2007 |
| Pracon Oy | Other services | 2023 |
| Priamer Group Oy | Real estate | 2012 |
| Privance Oy | Information & communication | 2008 |
| Privum Ab | Wholesale & retail | 2023 |
| Pro Raudoitus Oy | Construction | 2018 |
| Pro Shop Ville Kalliala Oy | Wholesale & retail | 1989 |
| ProLocalis Oy | Extraterritorial | 2017 |
| Profilac Oy | Construction | 2024 |
| Projektiili Ky | Arts & recreation | 2003 |
| Proximus Oy | Professional & scientific | 2000 |
| Pub Wartsu Oy | Hospitality | 2020 |
| Published Oy | Professional & scientific | 2026 |
| Puheterapia LL Oy | Health & social care | 2011 |
| Pukla Holdings Oy | Financial services | 2008 |
| Punctual Partners Oy | Arts & recreation | 1992 |
| Purowell Oy | Wholesale & retail | 2020 |
| Putkikonkarit Oy | Construction | 1997 |
| Puutarhasuunnittelu J. Kymäläinen Ky | Administrative & support | 1989 |
| Päälykäinen Oy | Professional & scientific | 2015 |
| Päästä parempi Oy | Other services | 1990 |
| Q-Katsastus Kirkkonummi Oy | Professional & scientific | 2024 |
| R & H Sijoitusasunnot Oy | Real estate | 2005 |
| R.M Creative Learning Playschool OY | Education | 2018 |
| Rakennusliike Josef Larsen OY | Construction | 2008 |
| RG-Rakennus Oy | Construction | 2008 |
| RH-Sähkö Oy | Construction | 2011 |
| Riitta Lees OY | Health & social care | 2015 |
| RMV-Korut Oy | Manufacturing | 1976 |
| RT Landgren Oy | Wholesale & retail | 2004 |
| RTS Invest Oy | Financial services | 2025 |
| Rabla LA Oy | Construction | 2011 |
| RajaKoivu Oy | Wholesale & retail | 2012 |
| Rakcate Group Oy Ltd | Water & waste | 2014 |
| Rakennus Kankainen Oy | Construction | 1995 |
| Rakennus Kiuru Oy | Construction | 2012 |
| Rakennus Muurahaiset Oy | Construction | 2016 |
| Rakennus ja saneeraus Laipaik Oy | Construction | 2013 |
| Rakennus- ja Maalausliike Esa Raita Oy | Construction | 1992 |
| Rakennushuolto Jarmo Vilén Oy | Construction | 2011 |
| Rakennusliike Ronkainen Oy | Construction | 2019 |
| Rakennuspalvelu Enberg & Guttesen Avoin yhtiö | Construction | 2002 |
| Rakennuspalvelu Sipilä Oy | Construction | 2011 |
| Rakennuspalvelut Jari Holm Oy | Construction | 2013 |
| Rakennustyö Kiuru Oy | Construction | 2021 |
| Rakentaja M. Talvinko Oy | Construction | 1988 |
| Rakest Oy | Construction | 2021 |
| Rancho Relaxo Oy Ltd | Information & communication | 2018 |
| Rannikon Rakennuspalvelu Oy | Construction | 2026 |
| RantaOksa Oy | Hospitality | 2017 |
| Ranya Oy | Other services | 2025 |
| Ratsutila Wikner Oy | Education | 2010 |
| Rautector oy | Construction | 2023 |
| Reala Living Oy | Real estate | 2023 |
| Recmatic Oy | Administrative & support | 2017 |
| Rehn Consulting Oy | Professional & scientific | 2020 |
| Reipas Mies Oy | Construction | 2013 |
| Relata Oy | Professional & scientific | 2010 |