| Ojala Forest Oy | Agriculture & fishing | 2019 |
| Ojennuksen Kotileipomo Oy | Manufacturing | 2003 |
| Ossi Harjunpää Ky | Administrative & support | 1995 |
| Otaniemen Erbau Oy | Construction | 2009 |
| Ottakaa Meiltä Oy | Transport & logistics | 2022 |
| Oy Green Cuckoo Investment Ab Ltd | Real estate | 2000 |
| Oy Ocab Ab | Professional & scientific | 1990 |
| Oy Tradic Ab Ltd | Wholesale & retail | 1994 |
| P. Honkaluoma Oy | Real estate | 1989 |
| Parkanon Kotiruoka Ja Juhlapalvelut OY | Hospitality | 2012 |
| PH Pinnoite Oy | Manufacturing | 2004 |
| PLP-Invest Oy | Transport & logistics | 2007 |
| PM-Laatutyö Oy | Construction | 2020 |
| PMT-Pipe Oy | Manufacturing | 2004 |
| PN Works Oy | Manufacturing | 2007 |
| Pahkalanranta Oy | Hospitality | 2026 |
| Palvelu Haljaste Oy | Administrative & support | 2011 |
| Parbuilding Oy | Real estate | 2019 |
| Parkano Consulting Oy | Professional & scientific | 2012 |
| Parkano Group Oy | Real estate | 2020 |
| Parkano Steel Oy | Manufacturing | 1989 |
| Parkanon AR-Kone Oy | Real estate | 1997 |
| Parkanon Autoilijat Oy | Wholesale & retail | 1983 |
| Parkanon Autokeskus Oy | Wholesale & retail | 1985 |
| Parkanon Autokoulu Ky | Education | 1982 |
| Parkanon Automaalaamo Oy | Other services | 2017 |
| Parkanon Betoni Oy | Manufacturing | 2005 |
| Parkanon Fysikaalinen Hoitolaitos Ky | Health & social care | 1985 |
| Parkanon Hyte-kiinteistöt Oy | Real estate | 2025 |
| Parkanon Höyläämö Oy | Manufacturing | 1989 |
| Parkanon Jalkine Oy | Manufacturing | 2020 |
| Parkanon Kehräämö avoin yhtiö | Wholesale & retail | 1950 |
| Parkanon Kenkätehtaan Tontti Oy | Real estate | 1998 |
| Parkanon Keräystuote Oy | Water & waste | 2013 |
| Parkanon Kiinteistö AL Oy | Real estate | 2012 |
| Parkanon Kodinkone Oy | Wholesale & retail | 1985 |
| Parkanon Kone ja Metalli Oy | Other services | 1982 |
| Parkanon Kuntokeskus Oy | Administrative & support | 1989 |
| Parkanon Kuntoutuskulma Ky | Health & social care | 1987 |
| Parkanon Lankakori oy | Wholesale & retail | 2016 |
| Parkanon Lasikuitu Oy | Manufacturing | 1984 |
| Parkanon Lasipalvelu Oy | Construction | 2007 |
| Parkanon Liikekiinteistöt Oy | Real estate | 2001 |
| Parkanon Liikenne-Center Oy | Education | 1982 |
| Parkanon Liikenneravintolat Oy | Real estate | 2001 |
| Parkanon Listakiinteistöt Oy | Real estate | 2010 |
| Parkanon Listatehdas Oy | Manufacturing | 2010 |
| Parkanon Metallituote Oy | Manufacturing | 1989 |
| Parkanon Metsäkuljetus Ky | Agriculture & fishing | 1992 |
| Parkanon Monirakenne Oy | Construction | 2007 |
| Parkanon Muotikulma Oy | Wholesale & retail | 2013 |
| Parkanon Muovituote Oy | Manufacturing | 1993 |
| Parkanon Pippuri Oy | Wholesale & retail | 1985 |
| Parkanon Puupiste Oy | Wholesale & retail | 2010 |
| Parkanon Rakennuspalvelu Oy | Construction | 2001 |
| Parkanon Rakennussähkö Oy | Construction | 1985 |
| Parkanon Raskaskonehuolto Oy | Real estate | 1995 |
| Parkanon Ruusuportti Oy | Real estate | 1990 |
| Parkanon Teollisuuskiinteistöt Oy | Construction | 2004 |
| Parkanon Vesi Oy | Water & waste | 2018 |
| Parkanon Yrityspalvelu Oy | Professional & scientific | 1981 |
| Parkanon kolme tähteä Oy | Real estate | 2024 |
| Parkanon viisi tähteä Oy | Real estate | 2008 |
| Parkanon vuokrakodit Oy | Real estate | 1996 |
| Parooni Invest Oy | Real estate | 2024 |
| Paroonin Osa Oy | Wholesale & retail | 2012 |
| Parsystems Oy | Professional & scientific | 2007 |
| Parturi ja Kampaamo Hiuspaja Mariina Oy | Other services | 2012 |
| Peltojärven Kiinteistöt Oy | Hospitality | 2005 |
| People & business Oy | Professional & scientific | 2024 |
| Pirkanmaan Investointi Oy | Real estate | 2010 |
| Pirkanmaan Talouspalvelut Oy | Professional & scientific | 2007 |
| Pirkanmaan torikauppa Oy | Wholesale & retail | 2021 |
| Pirkkalan Rahti- ja Huoltopalvelut Oy | Transport & logistics | 2018 |
| Pohjois-Parkanon Vesiosuuskunta | Water & waste | 1991 |
| Pohjolan Puukodit OY | Construction | 2012 |
| Privatus Oy | Financial services | 1989 |
| Promeda Group Oy | Information & communication | 2020 |
| Promeda Oy | Information & communication | 1992 |
| Putkisto- ja laiteasennus Kaskenviita Oy | Manufacturing | 2003 |
| Puuoskari Oy | Manufacturing | 1989 |
| Puusepänliike Pajunen Avoin yhtiö | Manufacturing | 1981 |
| Puusilmä Oy | Financial services | 2013 |
| Qrecords-viihde Oy | Professional & scientific | 1998 |
| Qualifit Oy | Information & communication | 2010 |
| Raffi Oy | Administrative & support | 2026 |
| Rakennus Cartel Oy | Construction | 2016 |
| Rakennus Vainionpää Oy | Construction | 2014 |
| Rakennusliike Hannu Rinne Oy | Construction | 1989 |
| Rakennuspalvelu Hirviniemi Oy | Construction | 2008 |
| Rakennuspalvelu Impponen Oy | Construction | 1994 |
| Rakennustarvike Seppälä Oy | Construction | 1981 |
| Rakennustyöt Mäkipää Oy | Construction | 2011 |
| Ramari Oy | Wholesale & retail | 2015 |
| Rapse Oy | Construction | 2004 |
| Ratituote Oy | Construction | 2013 |
| Rautarakenne Rajamäki Oy | Manufacturing | 2016 |
| Rengasparooni Oy | Wholesale & retail | 1992 |
| Rextradex Oy | Wholesale & retail | 2010 |
| Riihi Partners Oy | Wholesale & retail | 2010 |