| Nilsiän Sähkö Ky | Wholesale & retail | 1990 |
| Nilsiän Talohuolto Ky | Administrative & support | 1987 |
| Nilsiän Terävalmiste Ky | Manufacturing | 1985 |
| Nilsiän Tähtihammas Oy | Health & social care | 2013 |
| Nilsiän Tähtiportti Oy | Hospitality | 2025 |
| Nilsiän kiinteistöhuoltomestarit Oy | Administrative & support | 1990 |
| Nipasen Huolto Oy | Real estate | 2001 |
| Nipasen Tuvat Ky | Wholesale & retail | 2011 |
| Nordic Wolfen Oy | Professional & scientific | 2012 |
| Ompelimo-Verhoomo Tera Ky | Manufacturing | 2010 |
| Onetec oy | Wholesale & retail | 2007 |
| Oulujärven Lomat Oy | Hospitality | 2018 |
| Oxta Art Studio Oy | Arts & recreation | 2022 |
| Oy Honey River Ltd | Agriculture & fishing | 2020 |
| Oy Tahko Shop 313 | Wholesale & retail | 1989 |
| PETE Advising Oy | Education | 2023 |
| PS-Remontit Oy | Construction | 2026 |
| PVP Wellness Oy | Education | 2021 |
| Parviaisen Konepaja Oy | Other services | 2023 |
| Pekka Hakkarainen Oy | Agriculture & fishing | 1977 |
| Pielaveden Tilikeskus Oy | Professional & scientific | 1986 |
| Pig Mäk Oy | Manufacturing | 1991 |
| Pitomesta Ky | Hospitality | 2011 |
| Pizzeria Voitto Oy | Hospitality | 2016 |
| Pohjolan Talohuoltajat Oy | Administrative & support | 2021 |
| PumppuTahko Oy | Construction | 2018 |
| Puusepänliike M. Lipponen Kommandiittiyhtiö | Manufacturing | 1986 |
| Puutavara Puustinen Oy | Manufacturing | 1994 |
| Pyörä-Manninen Oy | Wholesale & retail | 1969 |
| RTM-Finland Oy | Construction | 2009 |
| RVT Palvelut OY | Real estate | 2012 |
| Rakennuspalvelu Jestoi Oy | Construction | 2021 |
| Rakennuspalvelu Kaarna Oy | Real estate | 2020 |
| Rakennuspalvelu P & J Hartikainen Oy | Construction | 2021 |
| Rakennuspalvelu Pääkkönen Ky | Construction | 2008 |
| Rakennuspalvelu Soininen Oy | Construction | 2018 |
| Ratakalibra Oy | Wholesale & retail | 2026 |
| Remonttityö Ronkainen Oy | Construction | 2015 |
| Retronainen Oy | Wholesale & retail | 2019 |
| Ribollita Oy | Hospitality | 2023 |
| Riemuliikunta Oy | Arts & recreation | 2017 |
| Rikunniemen Huolto Oy | Administrative & support | 1997 |
| Rikunniemi Oy | Real estate | 1986 |
| Robottikauppa Pro Oy | Wholesale & retail | 2025 |
| Roppakauppa Oy | Wholesale & retail | 2009 |
| Ruotsalainen Oy | Wholesale & retail | 1972 |
| SANTO Rakennus Oy | Construction | 2022 |
| SD Engineering Oy | Professional & scientific | 2023 |
| Sevian Group OY | Professional & scientific | 2016 |
| SORITO osk | Wholesale & retail | 2018 |
| SW Kuljetus Oy | Transport & logistics | 1992 |
| Saali Partners Oy | Real estate | 2025 |
| Sarander Oy | Health & social care | 2016 |
| Sarihenna Oy | Administrative & support | 2017 |
| Savo Shot Oy | Arts & recreation | 2002 |
| Savoca Oy | Hospitality | 2020 |
| Savon Kone- ja Rakennuspalvelu Oy | Construction | 2023 |
| Savon Rakennusporukka Oy | Construction | 2022 |
| Savon Tarviketalo Oy | Wholesale & retail | 1986 |
| Sillankorva Group Oy | Transport & logistics | 2022 |
| Sinikan uusi kukkakauppa ja hautauspalvelu Ky | Wholesale & retail | 2024 |
| Sirviön Nauta Oy | Agriculture & fishing | 2008 |
| Snapp Trans Oy | Transport & logistics | 2007 |
| Sofronov Oy | Manufacturing | 2023 |
| Suomen Gastropub Oy | Hospitality | 2009 |
| Suomen auto- ja venevälitys Oy | Hospitality | 2025 |
| Syvärin Konehuolto Oy | Manufacturing | 1981 |
| Säyneisen Urakointi Partanen Ky | Agriculture & fishing | 1980 |
| TAHKO FIN STAR Oy | Real estate | 2008 |
| Tahko Oil Oy | Wholesale & retail | 2006 |
| Tahko Service Oy | Arts & recreation | 2005 |
| Tahko Tirol Oy | Hospitality | 2016 |
| Tahko-Auto Ky | Wholesale & retail | 1978 |
| Tahko-Pointin Huolto Oy | Administrative & support | 2004 |
| Tahkon Aluesiivous Oy | Administrative & support | 2007 |
| Tahkon Petäjälahti Oy | Construction | 2006 |
| Tahkon Poro ja Kahvio Ky | Wholesale & retail | 1998 |
| Tahkon Talkkarit Oy | Administrative & support | 2014 |
| Tahkon alppikoulun autovuokraus Oy | Administrative & support | 2010 |
| Tahkopuro Oy | Real estate | 1988 |
| Tahkovuoren Liikuntakeidas Oy | Real estate | 2000 |
| Taksipalvelu K & H Hartikainen Oy | Transport & logistics | 2008 |
| Talonrakennus M. Taskinen Ky | Construction | 1996 |
| Tarpisen Loma Oy | Hospitality | 1997 |
| Tassu Consulting Oy | Professional & scientific | 2025 |
| Teknokulma Oy | Manufacturing | 2018 |
| Terpenik Oy | Other services | 2021 |
| Tiirinniemen Marjakallio Oy | Construction | 2006 |
| Tokkopa Oy | Real estate | 2021 |
| Torppa Konsultointi Ky | Real estate | 2012 |
| Touhu Invest Oy | Administrative & support | 2023 |
| Tuotemestarit Oy | Wholesale & retail | 2022 |
| TwentyOne Oy | Construction | 2024 |
| Uure Oy | Professional & scientific | 2025 |
| V. P. Airaksinen Oy | Transport & logistics | 2007 |
| Valkeiskylän vesiosuuskunta | Water & waste | 1994 |
| Vanha-Keskinen Oy | Agriculture & fishing | 2019 |
| Varatoimari Oy | Professional & scientific | 2016 |
| Vera Service Oy | Manufacturing | 2025 |
| Viasel Oy | Construction | 2001 |