| Kosken Kone Oy | Construction | 2014 |
| Kosken Varaosa Ky | Wholesale & retail | 1991 |
| Kotikankaan Tila Oy | Agriculture & fishing | 2021 |
| Kotipalvelu Jenny Oy | Health & social care | 2006 |
| KotoisaArki Oy | Health & social care | 2026 |
| Koulutus- ja kuntoutuskeskus Hevostaito Oy | Education | 2022 |
| KoutonenAutomotive Oy | Arts & recreation | 2025 |
| Kuhokone Oy | Agriculture & fishing | 2005 |
| Kujala Works Oy | Professional & scientific | 2023 |
| Kujalan Maatila Oy | Agriculture & fishing | 2018 |
| Kuljetus Herrala Oy | Transport & logistics | 2020 |
| Kuljetus I & A Ojalehto Oy | Transport & logistics | 2002 |
| Kuljetus Kaarlela Oy | Transport & logistics | 1995 |
| Kuljetus Korkiakoski Ky | Transport & logistics | 2002 |
| Kuljetus Mika Jyrkkä Oy | Transport & logistics | 2016 |
| Kuljetus P. Vähäaho Oy | Transport & logistics | 2009 |
| Kuljetus Wetomaa Oy | Transport & logistics | 2019 |
| Kuljetusliike J&M Vaaramaa Oy | Transport & logistics | 2006 |
| Kuljetusliike Pekka ja Jukka Mattila Oy | Transport & logistics | 1980 |
| Kuljetusyhtymä Heikki Niemi & K:nit | Transport & logistics | 1980 |
| Kumpulan kuivuriyhtymä avoin yhtiö | Agriculture & fishing | 1990 |
| Kuusamon Porontima Oy | Real estate | 1990 |
| Kytölän Tila Oy | Agriculture & fishing | 2018 |
| LEIZI Clothing Store Oy | Wholesale & retail | 2017 |
| LK-Holding Oy | Real estate | 2019 |
| LVI Aitto-oja Oy | Construction | 1993 |
| Laaksojen Sorkkahoito Oy | Agriculture & fishing | 2019 |
| Laaksojen Sähköpalvelu Oy | Construction | 2018 |
| Lakeuden Sisustuspalvelu Ky Kiiskilä & Co | Wholesale & retail | 1979 |
| Lasitek Oy | Construction | 2018 |
| Latomeri Oy | Professional & scientific | 2022 |
| Laurilan Kukka ja Hautaustoimisto Oy | Other services | 1981 |
| LinnaWork Oy | Construction | 2021 |
| Linware Oy | Wholesale & retail | 2021 |
| Lomakajuutta Oy | Real estate | 1996 |
| Lounas-Kahvila Saimi Oy | Hospitality | 2012 |
| Lumesa Oy | Construction | 2020 |
| Luontotekoja Oy | Professional & scientific | 2026 |
| M. Palola Oy | Manufacturing | 2019 |
| MAJA Apartments Oy | Hospitality | 2026 |
| MK Floors Oy | Construction | 2020 |
| ML Materials Oy | Financial services | 2025 |
| MP Sikala Oy | Administrative & support | 2024 |
| MSY Invest Oy | Financial services | 2025 |
| MT Heiska Oy | Agriculture & fishing | 2022 |
| MV-Trans Oy | Transport & logistics | 2010 |
| Maa- ja metsätalous Ohtamaa Oy | Agriculture & fishing | 2023 |
| Maanrakennus Erkkilä Oy | Construction | 1994 |
| Maansiirto ja Kuljetus J. Vaaramaa Oy | Construction | 1993 |
| Maaselän Metalli Oy | Manufacturing | 2020 |
| Maatyö Group Oy | Construction | 2024 |
| Maliskylä Motorsport Oy | Other services | 2024 |
| Malmitie Oy | Real estate | 2023 |
| Mansco Oy | Manufacturing | 1998 |
| Mari-Grilli Nivala Ky | Hospitality | 2025 |
| Marjat Medi Oy | Professional & scientific | 2024 |
| Matspro Oy | Manufacturing | 2023 |
| Maucom Ky | Agriculture & fishing | 2001 |
| Mecapinta Oy | Manufacturing | 2010 |
| Mecaplan Oy | Professional & scientific | 2001 |
| Medser Oy | Transport & logistics | 2025 |
| Mehtälän Multa Oy | Agriculture & fishing | 2021 |
| Merion Oy | Manufacturing | 2025 |
| Metsätyö Laurila Oy | Agriculture & fishing | 2010 |
| Mika Kaarlela Oy | Manufacturing | 1995 |
| Mikael Invest Oy | Professional & scientific | 2012 |
| Milpover Oy | Construction | 2007 |
| Minetek Oy | Construction | 2018 |
| Mitumill Oy | Manufacturing | 2019 |
| Mullikas Oy | Agriculture & fishing | 2022 |
| Muuraus ja Rappaus Saarimaa Oy | Construction | 2007 |
| Mvy Oy | Construction | 2024 |
| Myk Invest Oy | Financial services | 2026 |
| Männikön Tila Oy | Agriculture & fishing | 2021 |
| Nivalan Suorajakelu Korkiakoski Avoin Yhtiö | Transport & logistics | 2003 |
| NP-Tekniikka Ky | Professional & scientific | 1994 |
| NPP Holding Oy | Financial services | 2022 |
| NTcab Oy | Wholesale & retail | 1995 |
| Natural Colours Global Oy | Wholesale & retail | 2024 |
| Natural Woad Finland Oy | Manufacturing | 2020 |
| Naukas Oy | Agriculture & fishing | 2018 |
| Next Investment Oy | Administrative & support | 2024 |
| Niemen Viljatila Oy | Agriculture & fishing | 2023 |
| Niemimäen Tila Oy | Agriculture & fishing | 2019 |
| NivaTyöstö Oy | Manufacturing | 2011 |
| Nival Elektro Oy | Manufacturing | 2018 |
| Nivala-Haapajärven seutukunnan kehittämisyhtiö Nihak Oy | Professional & scientific | 2005 |
| Nivalan Akku ja Varuste Ky | Wholesale & retail | 1998 |
| Nivalan Autoasennus oy | Other services | 2021 |
| Nivalan Autohuolto Oy | Wholesale & retail | 1961 |
| Nivalan Autopaja Oy | Other services | 2005 |
| Nivalan Elektroniikkahuolto Ky | | 1985 |
| Nivalan Grillikioski Lis-Mari Oy | Hospitality | 2003 |
| Nivalan Haapapuu Oy | Manufacturing | 1992 |
| Nivalan Isännöinti- ja Kiinteistötaito Oy | Administrative & support | 2021 |
| Nivalan JP-Osa Oy | Other services | 2012 |
| Nivalan Järvikylän Osuuspankki | Financial services | 1915 |
| Nivalan Kapinakiinteistöt Oy | Real estate | 2025 |
| Nivalan Kaukolämpö Oy | Energy | 1978 |
| Nivalan Kirja Ky | Wholesale & retail | 1993 |