| Nurminen Capital Management Oy | Professional & scientific | 2024 |
| Nyfixi Oy | Information & communication | 2025 |
| OM-Sähkö Oy | Construction | 1992 |
| OP Koti Etelä-Pirkanmaa Oy LKV | Real estate | 1964 |
| OR-Koneistus Oy | Manufacturing | 1994 |
| Ois Auto Oy | Wholesale & retail | 2015 |
| Oiva Laaksonen Oy | Wholesale & retail | 2026 |
| Olmean Holding Oy | Professional & scientific | 2024 |
| Olympics Kebab Oy | Hospitality | 1998 |
| Omakiinteistö Tre Oy | Construction | 1993 |
| Ordinarius Oy | Education | 2023 |
| Osuuskunta Potku | Arts & recreation | 2011 |
| Ounaspraktiikka Oy | Professional & scientific | 1998 |
| Oy Balmoral Trade Service Ltd | Wholesale & retail | 1995 |
| Oy Dino-Rakenne Ab | Hospitality | 1993 |
| Oy Katrina Line Ab | Transport & logistics | 1997 |
| Oy Leer Ab | Professional & scientific | 1988 |
| PAT Steelway Oy | Construction | 2020 |
| PK-Tilintarkastajat Oy | Professional & scientific | 2016 |
| PK-Yhtiö Oy | Professional & scientific | 2023 |
| PKS-Tech Oy | Construction | 2020 |
| PLUR Companies Finland Oy | Hospitality | 2022 |
| PNT Holding Oy | Real estate | 2021 |
| Por Restat OY | Hospitality | 2023 |
| Pro Coaching Virta OY | Education | 2023 |
| Painotuote Roulamo Oy | Manufacturing | 2010 |
| Pakastin Oy | Professional & scientific | 2019 |
| Pallari Design avoin yhtiö | Professional & scientific | 2020 |
| Pappila Consulting Oy | Professional & scientific | 2018 |
| Parturi-Kampaamo Twins Ky | Other services | 1997 |
| Parturi-kampaamo Sarit, Sari Oksanen ja Miia Körhämö-Haaja | Other services | 1994 |
| Paukku Productions Ky | Professional & scientific | 2015 |
| Peltityöliike Pekkinen Ky | Construction | 2007 |
| Penkkikosken Sähkö Oy | Professional & scientific | 2008 |
| Pernoo 800 Oy | Professional & scientific | 2020 |
| Petek Oy | Wholesale & retail | 1991 |
| Pharmarent Oy | Real estate | 1993 |
| Photoart Tuntematon Tekijä ky | Professional & scientific | 1989 |
| Pilviluotsi Oy | Information & communication | 2019 |
| Pirkan LVI kuvaus- ja mittauspalvelu Oy | Professional & scientific | 2010 |
| Pirkanmaan Laatukodit Oy | Real estate | 2022 |
| Pirkanmaan Laatusaneeraus Oy | Construction | 2018 |
| Pirkanmaan Metalli Ky | Manufacturing | 1993 |
| Pirkanmaan Välitysliike Oy | Real estate | 2026 |
| Pirkanmaan datahuolto Oy | Information & communication | 2009 |
| Pirkkalan LL-jakelu Oy | Wholesale & retail | 1996 |
| Pirongia Invest Oy | Financial services | 2024 |
| PispanHalli Oy | Real estate | 2020 |
| Pispantallin Kahelit Oy | Real estate | 2016 |
| Pispantallin Kuljetustilat Oy | Real estate | 1993 |
| Pispantallin Lava Kommandiittiyhtiö | Manufacturing | 1986 |
| Pispantallin Maanrakennus Oy | Construction | 1994 |
| Pitkän Jussin Putki Oy | Construction | 2017 |
| PlainLily Oy Ltd | Professional & scientific | 2014 |
| Plasthouse Oy | Real estate | 2006 |
| Pohjoisrinne Park Oy | Real estate | 1990 |
| Pokat Invest Oy | Real estate | 2022 |
| Polar Racing Event Oy | Administrative & support | 2021 |
| Polarteline Oy | Construction | 2017 |
| Polytronic Oy | Manufacturing | 1985 |
| Porhio Yhtiöt Oy | Construction | 2005 |
| Prismacon Oy | Construction | 2017 |
| Propal Oy | Professional & scientific | 1998 |
| Puistogrilli Oy | Hospitality | 2014 |
| Purotek Oy | Wholesale & retail | 2021 |
| Puskapojat Oy | Agriculture & fishing | 1992 |
| Puutyö Koskiset Oy | Manufacturing | 1986 |
| Pälkäneen Tili ja Isännöinti Lehtonen & Lahti | Professional & scientific | 2004 |
| Q-Holdings Oy | Financial services | 2024 |
| Q-Kiinteistöt Oy | Real estate | 2013 |
| Quattrotec Oy | Professional & scientific | 2013 |
| Rikkon OY | Professional & scientific | 2013 |
| RJF Ilmastointi Oy | Construction | 2006 |
| RMP Rakennus Oy | Construction | 2008 |
| RTS Group Oy | Wholesale & retail | 2025 |
| Radio- ja Tv Elmeri Ky | Wholesale & retail | 1981 |
| Raju Suvi Oy | Wholesale & retail | 1997 |
| Rakennus ESK Oy | Construction | 2022 |
| Rakennus Ollenberg Oy | Construction | 2023 |
| Rakennus-Perolahti Oy | Construction | 1996 |
| Rakennusliike Miika Vaasio Oy | Construction | 2025 |
| Rakennusliike P. Rantanen Oy | Construction | 2019 |
| Rakennuspalvelu Benjamin Oy | Construction | 2019 |
| Rakennuspalvelu HeVi Oy | Construction | 2024 |
| Rakennuspalvelu Käpyaho Oy | Construction | 2019 |
| Rakennustoimisto Korpela Oy | Construction | 2009 |
| Rakennustyöt J.Rantanen Oy | Construction | 2025 |
| Rastas Ravintola Oy | Hospitality | 2018 |
| Ratakiree Oy | Construction | 2024 |
| Ratinan Huolto Oy | Real estate | 1990 |
| Rauhala Events Oy | Arts & recreation | 2023 |
| Rauko-Sport Ky | | 1979 |
| Rauta-Virtanen Oy | Wholesale & retail | 2024 |
| Rautiainen-Invest Oy | Financial services | 2017 |
| Ravian OY | Construction | 2018 |
| Ravintola - Paviljonki Apia Oy | Hospitality | 2014 |
| Ravintola E.Käki Ky | Hospitality | 1987 |
| Recycle Phone Finland Oy | Wholesale & retail | 2012 |
| Regatta Sound Oy | Arts & recreation | 2008 |
| Remusa Oy | Manufacturing | 2006 |