| Antti's painting service Oy | Construction | 2020 |
| Antti-L Oy | Professional & scientific | 2014 |
| Asylum Oy | Professional & scientific | 2004 |
| Bearland Oy | Construction | 2016 |
| Holapan Kuljetus Oy | Transport & logistics | 1992 |
| Innala Duomade Oy | Manufacturing | 2025 |
| J. Pietilä Invest Oy | Wholesale & retail | 1989 |
| JAukusti Invest Oy | Financial services | 2025 |
| JIL Holding Oy | Construction | 2026 |
| JPS Holding Oy | Financial services | 2019 |
| Jama Invest Oy | Professional & scientific | 2014 |
| Juse Oy | Wholesale & retail | 2022 |
| Jäähallit Uusimaa Oy | Real estate | 2007 |
| Keski-Uudenmaan ravintolapalvelut Oy | Hospitality | 2009 |
| Kiinteistö Oy Oulun Torikatu 22 | Real estate | 2022 |
| Kiinteistö Oy Varjakan kauppakeskus | Real estate | 1996 |
| Koneyhtymä H & J Oy | Construction | 2018 |
| Laksfors Oy | Construction | 1997 |
| Loftica Oy | Administrative & support | 2026 |
| Loihakka Oy | Administrative & support | 2012 |
| Lomace Oy | Professional & scientific | 2016 |
| MMS-Kiinteistöt Oy | Real estate | 2025 |
| Mankinen Logistic Oy | Transport & logistics | 2011 |
| Mantera Oy | Construction | 2015 |
| Maxone Oy | Construction | 1995 |
| Mursumoto Oy | Hospitality | 2026 |
| Na-To Logistiikka Oy | Transport & logistics | 2009 |
| OVE-Kiinteistöt Oy | Real estate | 2007 |
| Ohmix Oy | Professional & scientific | 2014 |
| Osplan Oy | Professional & scientific | 2003 |
| Oulun Kattotarvike Oy | Financial services | 1988 |
| Oulunsalon kiinteistöhuolto Oy | Administrative & support | 2012 |
| PTK Invest Oy | Real estate | 2022 |
| Pieneläinkrematorio Pohjantähti Oy | Other services | 2015 |
| Pihlajaluoto Holding Oy | Financial services | 2021 |
| Pohjolan Toivekodit Oy | Construction | 2016 |
| Pumppu-Ukko Oy | Construction | 2022 |
| Rakennustoimisto Hannu Vesala Oy | Construction | 1998 |
| Rileco Oy | Financial services | 2025 |
| Ronavia Oy | Financial services | 2025 |
| SMJ Invest Oy | Financial services | 2021 |
| Sillä Silaus Oy | Professional & scientific | 2013 |
| Trimcon Oy | Professional & scientific | 2013 |
| VK Tech Oy | Other services | 2025 |
| Vanhan-Juntin Puutarha Anja ja Jorma Henttu | Agriculture & fishing | 1980 |
| Yhdessä Pöydässä Oy | Arts & recreation | 2022 |