| Kuljetusliike Ansakorpi & Välisaari Oy | Transport & logistics | 1983 |
| Kuljetusliike Britta Grönlund Ky | Transport & logistics | 1988 |
| Kuljetusliike Jakopalvelu Oy | Transport & logistics | 1996 |
| Kuljetusliike Jari Oy | Transport & logistics | 1992 |
| Kuljetusliike Kalevi Kauppinen Ky | Transport & logistics | 1985 |
| Kuljetusliike NOTA Oy | Transport & logistics | 2001 |
| Kuljetusliike Raulamo Oy | Transport & logistics | 2005 |
| Kuljetuspalvelu Vatiala Oy | Transport & logistics | 2004 |
| Kulukuri Oy | Real estate | 2009 |
| Kuntosali Linja Oy | Arts & recreation | 2020 |
| Kuopion Liiketilat Oy | Construction | 2009 |
| Kuukivi Ventures Oy | Financial services | 2012 |
| Kuutiomaatio Oy | Professional & scientific | 1989 |
| Kylpyhuonetekniikka Tampere Oy | Construction | 2004 |
| Kyläniemen Katajakallio Oy | Real estate | 2006 |
| Kyöstin Herkku Ahtonen & tytär | Wholesale & retail | 1992 |
| Käpy & Keppi Oy | Agriculture & fishing | 2021 |
| Kärkisijoitus Oy | Financial services | 2021 |
| Käsityötalo Elviira Ky | Wholesale & retail | 2010 |
| Käyttölukko Oy | Wholesale & retail | 1989 |
| L & V Ulvinen Oy | Health & social care | 2004 |
| LJPKK Invest Oy | Financial services | 2017 |
| LJV-Invest Oy | Professional & scientific | 2008 |
| LP Bar Oy | Hospitality | 2013 |
| LP-Solutions Oy | Real estate | 2014 |
| LTL Group Oy | Construction | 2020 |
| LV-Keinoset Oy | Construction | 2002 |
| LVI Kaipainen Oy | Construction | 2021 |
| LVI Lohilahti Oy | Construction | 2018 |
| La Rambla Invest Oy | Real estate | 2021 |
| Laajatek Oy | Professional & scientific | 2025 |
| Laatoittajantien Maalaus Ky | Real estate | 1986 |
| Laatutec Koneistus Oy | Manufacturing | 2026 |
| Lahtelan Puutarha & Co | Agriculture & fishing | 2004 |
| Lahtelan Puutarha Ky | Agriculture & fishing | 1987 |
| Lahtinen Capital Oy | Financial services | 2024 |
| Laki- ja veroasiat Jaakkola Ky | Professional & scientific | 1994 |
| Lakiasiaintoimisto Mäkihannu Oy | Professional & scientific | 2024 |
| Latva Print Oy | Manufacturing | 2025 |
| Latvakuru Oy | Real estate | 1989 |
| Lautamäki Group Oy | Construction | 2013 |
| Lauvalan Ratsutila Oy | Agriculture & fishing | 2013 |
| Lehdon Puutarha Oy | Real estate | 1989 |
| Leinonen Kangasala Oy | Wholesale & retail | 2022 |
| Leipi Technologies Oy | Professional & scientific | 2020 |
| Leipomo järven rannalla Oy | Manufacturing | 2019 |
| Leivin vesi- ja viemäriosuuskunta | Water & waste | 2014 |
| Lentola Logistics Oy | Manufacturing | 2017 |
| Lentolan Autovelho Oy | Other services | 2024 |
| Lentolan Kiinteistöhuolto Oy | Administrative & support | 2000 |
| Lentolan Suora Oy | Real estate | 2006 |
| Lentävä Mökki Oy | Hospitality | 2017 |
| Leovian Oy | Financial services | 2025 |
| Lepohetkiä Oy | Professional & scientific | 2023 |
| Levyneliö Oy | Manufacturing | 1975 |
| Liikenne Helminen Oy | Transport & logistics | 2007 |
| Liikennevalmennus Jari Jokilampi Ky | Education | 1984 |
| Lillia Brothers Investment Oy | Professional & scientific | 1986 |
| Lillia Family Investment Oy | Financial services | 1994 |
| LilyLounge Oy | Real estate | 2024 |
| Linkosuo Oy | Financial services | 2015 |
| Linkosuon Kahvila Oy | Hospitality | 1957 |
| Linkosuon Leipomo Oy | Manufacturing | 1996 |
| Linnasaari Oy | Financial services | 2025 |
| Liona Dreams Oy | Professional & scientific | 2018 |
| Lions Talotekniikka Oy | Construction | 2022 |
| Listeds Oy | Information & communication | 2020 |
| Liveo Oy | Professional & scientific | 2010 |
| Longtrack Finland oy | Construction | 2006 |
| Louhes Oy | Construction | 2006 |
| Lounasravintola Rucolankukka Oy | Hospitality | 2012 |
| Luckpenny Oy | Professional & scientific | 2025 |
| Lucky Product Oy | Wholesale & retail | 2010 |
| Lueur Oy | Other services | 2023 |
| Luokkasen Kotikoneliike Oy | Wholesale & retail | 1964 |
| Luomumaakarit kommandiittiyhtiö | Agriculture & fishing | 2014 |
| Luonteva Oy | Professional & scientific | 2022 |
| Luotax Oy | Transport & logistics | 2023 |
| Luovain Oy | Information & communication | 2018 |
| Luovu Oy | Information & communication | 2012 |
| Luu Fairytale Oy | Professional & scientific | 2021 |
| Lyytikäinen Invest Oy | Financial services | 2024 |
| Löytötex Oy | Wholesale & retail | 1979 |
| Löövin Torppa Ky | Real estate | 1988 |
| M-Asennus Ky | Construction | 1999 |
| M. Huhtakallio Oy | Construction | 1993 |
| M. Kähönen Oy | Transport & logistics | 2006 |
| MGP Valmennus Oy | Education | 2025 |
| MH Finance Oy | Financial services | 2024 |
| MH Suunnittelu Oy | Professional & scientific | 2026 |
| Mhm-Rakennus Ky | Construction | 2011 |
| MK Bridge Oy | Professional & scientific | 2017 |
| MK Ingalsuo Ky | Manufacturing | 2011 |
| MKKO Invest Oy | Financial services | 2018 |
| MMKT Palvelut Oy | Administrative & support | 2024 |
| MMP-Finland Oy | Wholesale & retail | 2004 |
| Moomer OY | Information & communication | 2023 |
| MP Ajopalvelut Oy | Other services | 1980 |
| MR Hevospalvelut Oy | Education | 2025 |
| MRR Copilot Oy | Information & communication | 2025 |