| Optiradia Oy | Professional & scientific | 2024 |
| Orake Oy | Real estate | 1976 |
| Orsiteräs Oy | Manufacturing | 1986 |
| Osajemma Tampere Oy | Professional & scientific | 2002 |
| Oy JAMERCO Ltd. | Professional & scientific | 2008 |
| Oy Scandinavian J.M.A. Ab | Manufacturing | 1991 |
| Oy Stonecape Ltd | Wholesale & retail | 2001 |
| Oy Tervakeisari Ab | Manufacturing | 1998 |
| P Salonen Metalli Ky | Manufacturing | 1981 |
| P5 Rakennus Oy | Construction | 2023 |
| PDT Finland Oy | Administrative & support | 2015 |
| PETJU Invest Oy | Real estate | 2008 |
| PH-Car Service OY | Other services | 2018 |
| PJ MedLines Oy | Health & social care | 2016 |
| PJ Mykrä OY | Financial services | 2020 |
| PJ-Kiinteistöt Oy | Construction | 2006 |
| PK Tammer Service OY | Manufacturing | 2019 |
| PK4 Invest Oy | Financial services | 2024 |
| PLE Oy | Professional & scientific | 2021 |
| PLTeam Oy | Information & communication | 2021 |
| PPP Suomi Oy | Professional & scientific | 2021 |
| PRO-lämpö Group Oy | Professional & scientific | 2026 |
| PRO-lämpö Oy | Manufacturing | 2000 |
| PSP Salit Oy | Arts & recreation | 2011 |
| PT Jylhä Oy | Wholesale & retail | 1981 |
| Padelpiste Oy | Arts & recreation | 2014 |
| Paja Partners Oy | Real estate | 2025 |
| PajaTiimi Oy | Financial services | 2008 |
| Pajapirkka Oy | Construction | 1978 |
| Pajatyö Keskinen Oy | Manufacturing | 1975 |
| Pala investment Oy | Financial services | 2018 |
| Palafys Oy | Health & social care | 2021 |
| Paloma Solutions Oy | Information & communication | 2021 |
| ParMi Oy | Administrative & support | 2020 |
| Parke rakenne Oy | Construction | 2015 |
| Parta Eerikin Tsalonki Oy | Construction | 2019 |
| PattraK Oy | Construction | 2020 |
| Paulakorpi Oy | Other services | 2016 |
| Pekan Porakaivo Oy | Water & waste | 2020 |
| Pekan puujalat Oy | Real estate | 2019 |
| Pelikaani kioski grilli Oy | Hospitality | 2024 |
| Pellon Tuulivoima Oy | Energy | 2013 |
| Peltokorte Oy | Agriculture & fishing | 2016 |
| Peltomaa yhtiöt Oy | Real estate | 2026 |
| Petri Leppikangas Oy | Construction | 1998 |
| Petri Tuominen Kiinteistöt Oy | Financial services | 2006 |
| Pihamestari Tampere Oy | Construction | 2020 |
| Pihe Kiinteistöt Oy | Real estate | 1996 |
| PikkuOrava Oy | Wholesale & retail | 2020 |
| Pintalinja Oy | Manufacturing | 2017 |
| Pirjon Pakari Ylöjärvi Oy | Manufacturing | 2009 |
| Pirkan Automaatti Oy | Arts & recreation | 1988 |
| Pirkan Avartajat Oy | Manufacturing | 2021 |
| Pirkan Kaivin Oy | Construction | 1980 |
| Pirkan Linjatarvike Oy | Wholesale & retail | 1992 |
| Pirkan Maakaivukolmio Oy | Construction | 1989 |
| Pirkan Pirssi Oy | Transport & logistics | 1989 |
| Pirkan Rakentajapalvelu Oy | Construction | 2022 |
| Pirkan remontti yhtiöt Oy | Construction | 2013 |
| Pirkanmaan Automaatiokeskus M.E.L.O. Oy | Professional & scientific | 1993 |
| Pirkanmaan Autopaikka avoin yhtiö | Other services | 2023 |
| Pirkanmaan Autopalvelu Oy | Wholesale & retail | 1989 |
| Pirkanmaan FiksuKoti Oy | Real estate | 2026 |
| Pirkanmaan Hevoskuljetus Oy | Agriculture & fishing | 2025 |
| Pirkanmaan Hissitekniikka Oy | Construction | 2007 |
| Pirkanmaan Hyötyautot Oy | Wholesale & retail | 2005 |
| Pirkanmaan Ilmalämpö Oy | Construction | 2008 |
| Pirkanmaan Karjankuljetus Oy | Transport & logistics | 2008 |
| Pirkanmaan Kone- ja Huoltopalvelut PKH Oy | Construction | 2008 |
| Pirkanmaan Konepalvelu Oy | Construction | 2016 |
| Pirkanmaan Laatuetiketti Oy | Manufacturing | 2007 |
| Pirkanmaan Laatunostot Oy | Construction | 2012 |
| Pirkanmaan Mainospaino Ky | Professional & scientific | 2014 |
| Pirkanmaan Monialapalvelu Oy | Administrative & support | 2021 |
| Pirkanmaan Muuttopalvelu avoin yhtiö | Administrative & support | 2022 |
| Pirkanmaan PR-Tilat Oy | Real estate | 2010 |
| Pirkanmaan Palvelu-Taksi Oy | Transport & logistics | 1983 |
| Pirkanmaan Peltipiste Oy | Construction | 2022 |
| Pirkanmaan Pieneläinklinikka Oy | Professional & scientific | 2008 |
| Pirkanmaan Pinta-Insinöörit Oy | Administrative & support | 1994 |
| Pirkanmaan Plushuolto Oy | Administrative & support | 2013 |
| Pirkanmaan Remontti ja Siivous Oy | Construction | 2023 |
| Pirkanmaan Ristikko Oy | Manufacturing | 1994 |
| Pirkanmaan Sisäpinta Oy | Construction | 2014 |
| Pirkanmaan Teollisuushuolto Oy | Manufacturing | 2020 |
| Pirkanmaan Work & Clean Oy | Wholesale & retail | 2010 |
| Pirkanmaan sauna- ja juhlatilat Oy | Real estate | 2020 |
| Pirkanmaan tila- ja varastovuokraus Oy | Transport & logistics | 2020 |
| Pirmek Asennus Oy | Construction | 2011 |
| Pistelennot Oy | Education | 2025 |
| Pitmik oy | Other services | 2022 |
| PlayLand Finland Oy | Arts & recreation | 2024 |
| Playliner Oy | Information & communication | 2021 |
| PlusConsulting Oy | Professional & scientific | 2020 |
| Plusicar Oy | Other services | 2022 |
| Pmty Oy | Construction | 2020 |
| Pohjolan Jousitukku Oy | Wholesale & retail | 2013 |
| Pohjolan Taitajat Oy | Construction | 2006 |
| Polartra Oy | Financial services | 1995 |
| Porkka Finland Oy | Manufacturing | 1952 |