| Laatoitus Lämsä Oy | Construction | 2007 |
| LaattaLinja Oy | Construction | 2025 |
| Laatutuvat Oy | Real estate | 2021 |
| Lahjaamo Oy | Education | 2020 |
| Lahtela-Yhtiöt Oy | Professional & scientific | 2014 |
| LaikoHolm Oy | Manufacturing | 1993 |
| LainaanÄssä Oy | Health & social care | 2023 |
| Laiskotti Oy | Real estate | 1993 |
| Laite- ja Konepalvelu Holm Ky | | 1984 |
| Laitepalvelu J.S. Ky | Manufacturing | 2009 |
| Laitilan Leipä-Puu Ky | Construction | 1995 |
| Lakehansa Oy | Wholesale & retail | 1998 |
| Laki ja Metsä Oy | Professional & scientific | 2014 |
| Lakiasiaintoimisto Kiikeri Ky | Professional & scientific | 2001 |
| Lakiasiaintoimisto Lawco Oy | Professional & scientific | 2022 |
| Lakiasiaintoimisto Neuvonen Oy | Professional & scientific | 2015 |
| Lakiasiaintoimisto Nyman & Pogreboff, avoin yhtiö | Professional & scientific | 2001 |
| Lakipalvelut Aallotar Oy | Professional & scientific | 2025 |
| Lakipoika Oy | Professional & scientific | 1996 |
| Lamu Invest Oy | Real estate | 2007 |
| LapIT Oy | Information & communication | 2000 |
| LapLoved Oy | Administrative & support | 2026 |
| LapPro Solutions Oy | Administrative & support | 2024 |
| LapSec Oy | Administrative & support | 2006 |
| Laphold Oy | Financial services | 2026 |
| Lapin Akkumaailma Oy | Wholesale & retail | 2012 |
| Lapin Apu Oy | Wholesale & retail | 2023 |
| Lapin Asbesti Oy | Construction | 2021 |
| Lapin Asuntopalvelut LKV Oy | Real estate | 2015 |
| Lapin Auto-osa Oy | Wholesale & retail | 1998 |
| Lapin Autosisustajat Ky | Real estate | 1978 |
| Lapin Autovaruste Oy | Other services | 2023 |
| Lapin Biljardipiste Ky | Administrative & support | 1994 |
| Lapin Caravanhuolto Oy | Other services | 2015 |
| Lapin DPF Pesu Oy | Other services | 2021 |
| Lapin Digikoulutus Oy | Education | 2022 |
| Lapin Digituki Oy | Other services | 2025 |
| Lapin Eliksiiri Oy | Hospitality | 1990 |
| Lapin Erämatkat Ky | Administrative & support | 2005 |
| Lapin Eurova Oy | Hospitality | 2007 |
| Lapin Fysioterapia Ky | Health & social care | 1988 |
| Lapin Hammaslaboratoriopalvelut Oy | Manufacturing | 2021 |
| Lapin Hammasproteesipalvelu Oy | Manufacturing | 1974 |
| Lapin Hullu ohjelmapalvelut Oy | Arts & recreation | 2020 |
| Lapin Huoltamolaitteet Oy | Manufacturing | 1983 |
| Lapin Ikkunapesu Oy | Administrative & support | 2023 |
| Lapin Invest Ky | Education | 1977 |
| Lapin Jalkaterapia, avoin yhtiö | Health & social care | 2004 |
| Lapin Kallio & Sora Oy | Mining & quarrying | 2019 |
| Lapin Kalustepiste Ky | Manufacturing | 1990 |
| Lapin Kanki Oy | Administrative & support | 2016 |
| Lapin Keittiöt Oy | Wholesale & retail | 2015 |
| Lapin Kiinteistöt Oy | Real estate | 2022 |
| Lapin Kipinä Oy | Health & social care | 2023 |
| Lapin Kivituote Oy | Manufacturing | 2025 |
| Lapin Kone- ja Hitsauspalvelu Oy | Manufacturing | 2013 |
| Lapin Koulutuspalvelut Oy | Education | 2022 |
| Lapin Kuitutuote Oy | Manufacturing | 2021 |
| Lapin Kultatupa Oy | Wholesale & retail | 2004 |
| Lapin Kumi Oy | Other services | 2024 |
| Lapin Kuningatar Oy | Wholesale & retail | 2011 |
| Lapin Kuntoutus Oy | Health & social care | 2012 |
| Lapin LVI-Ykkönen Oy | Construction | 1998 |
| Lapin LVI-huolto Oy | Real estate | 2010 |
| Lapin Laatta-asennus Oy | Construction | 2018 |
| Lapin Laatupinta Oy | Construction | 2022 |
| Lapin Laatutyö Oy | Agriculture & fishing | 2023 |
| Lapin Laatuvirta Oy | Construction | 2023 |
| Lapin Lattiamestarit Oy | Construction | 1992 |
| Lapin Laukku Oy | Wholesale & retail | 2019 |
| Lapin Leipomo Group Oy | Professional & scientific | 2022 |
| Lapin Leipomo Oy | Manufacturing | 2014 |
| Lapin Leuka Oy | Health & social care | 2016 |
| Lapin Liha Oy | Manufacturing | 1976 |
| Lapin Liikepalvelut Ky | Professional & scientific | 1982 |
| Lapin Liiketilat Oy | Real estate | 2019 |
| Lapin Line Oy | Transport & logistics | 2021 |
| Lapin Logistiikka Oy | Transport & logistics | 2018 |
| Lapin Loistotilat Oy | Real estate | 2016 |
| Lapin Louhos Oy | Real estate | 2022 |
| Lapin Lyyli Oy | Wholesale & retail | 2000 |
| Lapin Lääkäripalvelut Oy | Health & social care | 2020 |
| Lapin Maakuntapaino Ky | Manufacturing | 1978 |
| Lapin Master Oy | Wholesale & retail | 2018 |
| Lapin Materiaalikierrätys Oy | Water & waste | 2020 |
| Lapin Metallikierrätys Oy | Wholesale & retail | 2001 |
| Lapin Metallipinnoite Oy | Manufacturing | 1992 |
| Lapin Metsäpalvelut Oy | Agriculture & fishing | 2016 |
| Lapin Mittauspalvelu Oy | Professional & scientific | 2015 |
| Lapin Moottorihiomo Oy | Other services | 2021 |
| Lapin Muovi Oy | Wholesale & retail | 1962 |
| Lapin Myyntipalvelut Oy | Wholesale & retail | 2019 |
| Lapin Nahka Oy | Manufacturing | 2001 |
| Lapin Optikko Oy | Wholesale & retail | 2008 |
| Lapin Panimo Oy | Manufacturing | 2015 |
| Lapin Pihakaivuu Oy | Construction | 2018 |
| Lapin Pikiöljy Oy | Manufacturing | 2015 |
| Lapin Pitopalvelu Oy | Hospitality | 1980 |
| Lapin Poro ja Riista Oy | Manufacturing | 2006 |
| Lapin Pro-Urakoitsijat Oy | Construction | 2013 |