| Kulttuuriosuuskunta Raami | Arts & recreation | 2006 |
| Kumpula Holding Oy | Real estate | 2008 |
| Kunnostava Oy | Real estate | 2026 |
| Kuortaneen Fysioterapia Ky | Health & social care | 1986 |
| Kuortaneen Sora ja Kuljetus Oy | Mining & quarrying | 1966 |
| Kuosi Bar&Catering Oy | Hospitality | 2017 |
| Kuraläppä Media Oy | Information & communication | 2021 |
| Kustannusosakeyhtiö Bookcover | Information & communication | 2014 |
| Kustantamo Toiset tarinat Oy | Information & communication | 2018 |
| Kuusisto Capital Oy | Real estate | 2012 |
| Kynix Oy | Information & communication | 2018 |
| Kyrkösvuori Oy | Real estate | 2012 |
| Kytöpirtti Oy | Real estate | 1974 |
| Käpälämäen Rakennus Oy | Construction | 2014 |
| Kärki-Agri Oy | Wholesale & retail | 2008 |
| Käyttöauto Oy | Wholesale & retail | 1987 |
| Käyttöauto Suomi Oy | Wholesale & retail | 2004 |
| L & J Saarela Ay | Wholesale & retail | 2004 |
| L & R Product Oy | Real estate | 1982 |
| LATOVARJO yhtiöt Oy | Construction | 2011 |
| LF Dental Oy | Health & social care | 2026 |
| LH Broileri Ky | Agriculture & fishing | 1997 |
| LKV Point Oy | Real estate | 2019 |
| LNH Consulting Oy | Administrative & support | 2019 |
| LRP Rakennuspalvelut Oy | Construction | 2022 |
| LS Print Oy | Manufacturing | 2020 |
| LSP-Group Oy | Real estate | 2018 |
| LT Agency Oy | Professional & scientific | 2020 |
| LT Cap Oy | Professional & scientific | 1992 |
| LT Solutions Oy | Arts & recreation | 2021 |
| LT Zepeteus Oy | Professional & scientific | 2021 |
| LV Vuokra-Asunnot Oy | Real estate | 2020 |
| LVI-Asennus Kangas Oy | Construction | 2008 |
| LVI-Kankaanpää Oy | Construction | 2018 |
| LVI-Kuure Oy | Construction | 1993 |
| LVI-Palvelu Matti Luopa Oy | Construction | 1994 |
| LVI-Suunnittelu K. Lehtisaari Oy | Professional & scientific | 2008 |
| LVI-Toimisto Seilvi Ky | Professional & scientific | 1982 |
| LVI-automaatio Viitaniemi Oy | Professional & scientific | 2011 |
| LVI-suunnittelu Hedberg Oy | Professional & scientific | 2024 |
| LVIS-Palvelu Ky Lauri Hietavirta | Construction | 1988 |
| Laatta Center Seinäjoki Oy | Wholesale & retail | 2002 |
| Lag or Trade Oy | Professional & scientific | 2023 |
| Lahjatavaramyynti Enkelin Eväspussi Oy | Wholesale & retail | 1999 |
| Laihian Säästöpiste Ky | Wholesale & retail | 1982 |
| Lainaisäntä Oy | Administrative & support | 2015 |
| Laiteko Oy | Manufacturing | 2015 |
| Lakea Holding Oy | Real estate | 2022 |
| Lakea Kiinteistöt Oy | Real estate | 2010 |
| Lakea Omaksi Oy | Real estate | 2024 |
| Lakea Oy | Real estate | 1975 |
| Lakegrid Oy | Real estate | 2026 |
| Lakeuden ALK-Rakennus Oy | Construction | 1997 |
| Lakeuden Aarteet Oy | Wholesale & retail | 2023 |
| Lakeuden Akvaariotarvike Oy | Wholesale & retail | 2017 |
| Lakeuden Avuxi Avoin yhtiö | Administrative & support | 2011 |
| Lakeuden Energia ja Sähkö Oy | Construction | 2013 |
| Lakeuden Eristystyöt Oy | Construction | 2022 |
| Lakeuden Gynmedikal Oy | Health & social care | 2004 |
| Lakeuden Hallintopalvelut Oy | Administrative & support | 2020 |
| Lakeuden Hydro Oy | Wholesale & retail | 1971 |
| Lakeuden IS-talot Oy | Real estate | 1996 |
| Lakeuden Kiinteistökulma Oy | Real estate | 1992 |
| Lakeuden KiinteistönVälitys LKV Oy | Real estate | 2017 |
| Lakeuden Kodinkonehuolto Oy | Other services | 2012 |
| Lakeuden Koiraurheilukeskus Oy | Arts & recreation | 2012 |
| Lakeuden Konemyynti Oy | Manufacturing | 2011 |
| Lakeuden Korjauskeskus Oy | Construction | 1991 |
| Lakeuden Kotiapu Oy | Health & social care | 2022 |
| Lakeuden Laatuvälittäjät Oy | Real estate | 2018 |
| Lakeuden Lattia Oy | Construction | 1978 |
| Lakeuden Lounas OY | Hospitality | 2025 |
| Lakeuden Mediperhe Oy | Health & social care | 2014 |
| Lakeuden Motohuolto Oy | Manufacturing | 2005 |
| Lakeuden Oma Koti Oy | Real estate | 2016 |
| Lakeuden Rakennustekniikka Oy | Construction | 2022 |
| Lakeuden Salaoja Oy | Construction | 1979 |
| Lakeuden Shoppis avoin yhtiö | Wholesale & retail | 2004 |
| Lakeuden Taivaanraapija Oy | Professional & scientific | 2021 |
| Lakeuden Talokeskus Oy | Administrative & support | 2022 |
| Lakeuden Tehdaspalvelu LTP Oy | Wholesale & retail | 2021 |
| Lakeuden Tili ja Perintä Oy | Financial services | 1993 |
| Lakeuden Työkalukeskus Oy | Wholesale & retail | 1990 |
| Lakeuden Vesi Oy | Water & waste | 1981 |
| Lakeuden Vihertaimisto Oy | Wholesale & retail | 2021 |
| Lakeuden Vuokrakodit Oy | Real estate | 2019 |
| Lakeuden Vuokravälitys Ky | Real estate | 2016 |
| Lakeuden Ympäristöhuolto Oy | Water & waste | 1986 |
| Lakeuden Yrityspalvelu Oy | Professional & scientific | 2021 |
| Lakeuden laitevuokraus oy | Administrative & support | 2024 |
| Lakeuden rakennus- ja suunnittelupalvelu Oy | Professional & scientific | 2010 |
| Lakeus Capital Oy | Financial services | 2002 |
| Lakeus Force Oy | Transport & logistics | 2025 |
| Lakeus Group Ky | Construction | 2018 |
| Lakeus Office Oy | Other services | 2013 |
| Lakeus Park Oy | Education | 2020 |
| Lakeusrekry Oy | Administrative & support | 2014 |
| Lakiaforest Group Oy | Professional & scientific | 2024 |
| Lakiasiaintoimisto Suometar Oy | Professional & scientific | 2014 |
| Lakitoimisto 60100 Oy | Professional & scientific | 2023 |