| Kivapa Oy | Arts & recreation | 2011 |
| Kodinkonekomppis Oy | Other services | 2016 |
| Koivumaat Ky | Wholesale & retail | 1988 |
| Kommandiittiyhtiö Kemin Konepaja, Ulén | Manufacturing | 1957 |
| Kon Sys Oy | Construction | 2023 |
| Koneprikki Ky | | 1986 |
| Koneurakointi Ari Nieppola Ky | Administrative & support | 2005 |
| Koneurakointi Koivistot Oy | Agriculture & fishing | 1989 |
| Korkiakoski Advisory Oy | Real estate | 2026 |
| Korpikannel 1957 Ky | Manufacturing | 2016 |
| Kotihoito Koivu Osk | Health & social care | 2018 |
| Koy Kemin Keskuspuistokatu 1 | Real estate | 2022 |
| Koy Kemin Keskuspuistokatu 15 | Real estate | 2023 |
| Kukka-Aitta Ky | Real estate | 1984 |
| Kuljetus J. Mäläskä Oy | Transport & logistics | 2019 |
| Kuljetus J. Pulkkinen Ky | Transport & logistics | 1994 |
| Kuljetus Marko Rytkönen Oy | Transport & logistics | 2023 |
| Kuljetusliike A Paananen Ky | Transport & logistics | 1993 |
| Kuljetusliike Aleksi Rytkönen Oy | Transport & logistics | 2020 |
| Kuljetusliike H & J Kuronen Ky | Transport & logistics | 1983 |
| Kuljetusliike Kimmo Paaso Oy | Transport & logistics | 2024 |
| Kuljetusliike Kimmo Pelander Ky | Transport & logistics | 1996 |
| Kuljetusliike T & T Kaappola Ky | Transport & logistics | 2004 |
| Kultaoptiikka, S & V Kemppainen Ky | Wholesale & retail | 1976 |
| Kuntosali Ykkös-Kunto Ky | Arts & recreation | 1991 |
| Kuopion Puukeidas Oy | Wholesale & retail | 2000 |
| Kuro Infrastructure Finland Oy | Information & communication | 2026 |
| Kuukasjärvi Oy Insinööritoimisto | Professional & scientific | 1989 |
| Kylmä-Jaakko Oy | Construction | 2014 |
| LK Rent Oy | Administrative & support | 2022 |
| LKV Pohjanen Oy | Real estate | 2025 |
| LOKO Ky | Education | 2014 |
| LOVE to Travel Oy | Administrative & support | 2024 |
| LTR-Rakennus Oy | Construction | 1983 |
| LV Nuotta Oy | Hospitality | 2015 |
| LaVe Oy | Manufacturing | 2011 |
| Lakiasiaintoimisto Oikeudet ja Arvot Oy | Professional & scientific | 2024 |
| Lapin LVI-Asennus Oy | Construction | 1987 |
| Lapin Monipalvelu Oy | Construction | 2017 |
| Lapin Puhallusvilla Ky | Construction | 1978 |
| Lapin Ratsastuskeskus Oy | Arts & recreation | 1985 |
| Lapin matkailu- ja asiakaspalvelut Oy | Other services | 2021 |
| Lapin tapahtumat - Laplands Events Oy | Administrative & support | 2010 |
| Lapinmeren Melontakeskus Oy | Administrative & support | 2006 |
| Lapintie 7 Oy | Real estate | 2013 |
| Lapland Engineering Oy | Other services | 2008 |
| Lapland Home Service Oy | Administrative & support | 2021 |
| Lappiporras Oy | Manufacturing | 1997 |
| Lappituote E. Himanen Oy | Wholesale & retail | 1996 |
| Lentojätkä Ky | Administrative & support | 1999 |
| Lentolaivue 65 Oy | Information & communication | 2026 |
| Levin Villa Piccolo Oy | Hospitality | 1992 |
| Levymyynti E. Ylikärppä Avoin yhtiö | Wholesale & retail | 1981 |
| Liikunta- ja hyvinvointipalvelut JK Oy | Arts & recreation | 2015 |
| Linone Oy | Manufacturing | 2018 |
| Lippokala Oy | Administrative & support | 2019 |
| Lipposiika Oy | Administrative & support | 2026 |
| Loma-Lappi Oy | Administrative & support | 1988 |
| Lounais-Lapin Remonttipalvelu Ky | Other services | 2009 |
| LousteK Oy | Construction | 2022 |
| Luppo-Pallas Oy | Hospitality | 1986 |
| Lämpö Oy Lämpöhaara | Energy | 1979 |
| Lännen Moniala Palvelu Oy | Administrative & support | 2008 |
| Länsi-Lapin Konditoria Oy | Manufacturing | 1999 |
| Länsi-Pohjan Kirjapaino Oy | Manufacturing | 1979 |
| Lääkäripalvelut Langen Oy | Health & social care | 2009 |
| Manensi Ky | Agriculture & fishing | 2012 |
| MAxperience Finland Oy | Arts & recreation | 2024 |
| MH Pool Oy | Professional & scientific | 2008 |
| MH-Digi Oy | Information & communication | 2020 |
| MK Paja Oy | Manufacturing | 2017 |
| MM-Studio Ky Matti Miikkulainen | | 1992 |
| MT-Suunnittelu Oy | Information & communication | 1994 |
| MTO Consulting Oy | Professional & scientific | 2020 |
| MV Kierrätyspalvelu Oy | Wholesale & retail | 2021 |
| Maalausliike Urho Remes Oy | Construction | 1975 |
| Maanrakennus Tyystälä Oy | Transport & logistics | 1991 |
| Maanrakennus Veljekset Kujala Oy | Construction | 1987 |
| Maansiirto J. & J. Kinnunen Oy | Construction | 1988 |
| Maarakennus Palsa Oy | Construction | 2024 |
| Mainostalo Teippari Oy | Manufacturing | 1991 |
| Maipar Ky | Hospitality | 1988 |
| Maitta Oy | Professional & scientific | 2015 |
| Maksniemen Vesiosuuskunta | Water & waste | 1967 |
| Map-Kiinteistöt Oy | Real estate | 1993 |
| MapleStorm Oy | Arts & recreation | 2019 |
| Marjatta Valikainen Ky | Hospitality | 1993 |
| Markun Rauta Ky | Wholesale & retail | 1989 |
| Marvion Oy | Financial services | 2026 |
| Matsari Oy | Real estate | 1981 |
| Matti J. Hooli Oy | Real estate | 1991 |
| Matti Luokkala Oy | Transport & logistics | 1997 |
| MeLiTe Oy | Health & social care | 2024 |
| MediKemi Oy | Health & social care | 2010 |
| Meri Lapin Sähkö Oy | Construction | 1985 |
| Meri-Lapin Hammasklinikka Oy | Health & social care | 2025 |
| Meri-Lapin Kiinteistöpalvelut Oy | Administrative & support | 2020 |
| Meri-Lapin Kunnonvalvonta Oy | Manufacturing | 2022 |
| Meri-Lapin LVI-työt Oy | Construction | 2007 |
| Meri-Lapin Lukituspalvelu Oy | Wholesale & retail | 2010 |