| Kunovo Oy | Hospitality | 2019 |
| Kuntorannan lomakeskus Oy | Hospitality | 2020 |
| Kuntosali Jyväskylä Oy | Arts & recreation | 2022 |
| Kuopio Convention Bureau Oy | Professional & scientific | 2016 |
| Kuopion Makeispuoti Oy | Wholesale & retail | 1989 |
| Kupra Oy | Construction | 2020 |
| Kurikankylän Kirppis Oy | Wholesale & retail | 2019 |
| Kuru Resort Oy | Hospitality | 2016 |
| Kurwa Holding Oy | Financial services | 2021 |
| Kustannus Oy Buen Media Global | Information & communication | 2023 |
| Kustannus Oy Vista | Information & communication | 2006 |
| Kustavin käsityöläiset osk | Arts & recreation | 2021 |
| Kuudes hammas oy | Health & social care | 2019 |
| Kuullas Finland Oy | Professional & scientific | 2022 |
| Kuusankoski Estate Oy | Real estate | 2025 |
| Kuusenkerkkiä Oy | Administrative & support | 2021 |
| Kuutamo Jooga Oy | Arts & recreation | 2020 |
| Kyborgit Oy | Arts & recreation | 2022 |
| Kylien Osuuskunta | Professional & scientific | 2015 |
| Kylmä-Techno Oy | Wholesale & retail | 2017 |
| Kymen Laatukiilto Oy | Other services | 2022 |
| Kymen Taksiliikenne Oy | Transport & logistics | 2020 |
| Kyrönmaan Näkö Oy | Wholesale & retail | 1987 |
| Käpylän Wanha Tatuointiosuuskunta | Other services | 2014 |
| Kärkölän LVI asennus Oy | Construction | 2012 |
| Köket Restaurang & Catering Åland AB | Hospitality | 2019 |
| Köyhille Kallis Oy | Professional & scientific | 2020 |
| L & H Koivu invest Oy | Real estate | 2020 |
| LAFS Ab | Information & communication | 2022 |
| LAH-KO Rakennus Oy | Construction | 2014 |
| LAL-Trade Oy | Wholesale & retail | 1993 |
| Lato Palvelut OY | Hospitality | 2019 |
| Lats.Ax AB | Other services | 2021 |
| LB Finland Oy | Professional & scientific | 2024 |
| LCL Engineering Oy | Manufacturing | 1992 |
| LD Partners Oy Ab | Wholesale & retail | 2023 |
| LED Taxi Oy | Transport & logistics | 2020 |
| LEINO Enterprises Oy | Professional & scientific | 2025 |
| Lele Housing OY | Real estate | 2012 |
| Leonotis OY | Arts & recreation | 2018 |
| Leox OY | Wholesale & retail | 2017 |
| LH Management Consulting Oy | Professional & scientific | 2016 |
| LHX Consulting Oy | Professional & scientific | 1997 |
| LJP Group Oy | Manufacturing | 2024 |
| LK Company Oy | Financial services | 2021 |
| LKS Rakennus Oy | Construction | 2023 |
| LKS ledarcoach Ab | Professional & scientific | 2010 |
| LL Nordic Oy | Real estate | 2024 |
| LL Renovation & Construction Oy | Construction | 2019 |
| LM-Logistiikka Oy | Education | 1994 |
| LN Forever OY | Hospitality | 2010 |
| LN Productions OY | Arts & recreation | 2022 |
| LNK Events osk. | Arts & recreation | 2017 |
| LOL Market Oy | Wholesale & retail | 2021 |
| Lounas Kahvila Pölkky II OY | Hospitality | 2020 |
| Love Lifestyle OY | Other services | 2021 |
| LPK Kuljetus Oy | Transport & logistics | 2022 |
| LPU-Holding Oy | Professional & scientific | 2024 |
| LSC Consulting & Holding Oy | Transport & logistics | 2017 |
| LV-Taksi Oy | Transport & logistics | 1998 |
| Lvi Niemi OY | Construction | 2020 |
| LVI Star Oy | Construction | 2012 |
| LVI Vallonne Oy | Construction | 2020 |
| LVI-Saartum Oy | Construction | 2016 |
| LVI-Toptec oy | Construction | 2018 |
| LVI-palvelu Saku ky | Construction | 2007 |
| Lysami-Oy | Manufacturing | 2022 |
| LZ Equity HoldCo 6 Oy | Financial services | 2021 |
| La Festa Limingantulli Oy | Hospitality | 2018 |
| La Terrazza Oy | Hospitality | 2021 |
| Laaksi Investment Oy | Financial services | 2005 |
| Laatoitusveljet & Partnerit Oy | Construction | 2020 |
| Laaturinki Oy | Information & communication | 2016 |
| Laatusaneeraus Teini oy | Construction | 2023 |
| Lacoda Oy | Wholesale & retail | 2003 |
| Lady Tiimi Oy | Administrative & support | 2019 |
| Lahdelman Lomat Oy | Hospitality | 2008 |
| Lahden Kristillinen Kauppa Oy | Wholesale & retail | 2015 |
| Lahden Seudun Voimavara Osk | Professional & scientific | 1994 |
| Lahu Construction Oy | Construction | 2022 |
| Laivaniemi Holding Oy | Financial services | 2006 |
| LakesLand Oy | Hospitality | 2021 |
| Lakeuden Ilmarit Oy | Wholesale & retail | 2015 |
| Lakeuden Pienkonehuolto Oy | Other services | 2022 |
| Lakeuden kotikaluste ky | Transport & logistics | 1980 |
| Laki Talsi Oy | Professional & scientific | 2018 |
| Lakia Legal Consulting Oy | Professional & scientific | 1998 |
| Lakiasiainpalvelut Päivi Hack Oy | Professional & scientific | 2021 |
| Lakiasiaintoimisto Lex Rex Ky | Professional & scientific | 2016 |
| Lakiasiaintoimisto Nyman & Söderholm Oy | Wholesale & retail | 2020 |
| Lakiasiaintoimisto Polonia Oy | Professional & scientific | 2017 |
| Lakitoimisto Simmermann Oy | Professional & scientific | 2018 |
| Lakitoimisto Sinica Oy | Professional & scientific | 2019 |
| Lamarin Oy | Construction | 2017 |
| LamiPro Store Oy | Wholesale & retail | 2018 |
| Lammisen Kiinteistöt Oy | Real estate | 1974 |
| Lande Oy | Hospitality | 2023 |
| Landforest Oy | Agriculture & fishing | 2020 |
| Lap maansiirto ja rakennus Oy | Construction | 1983 |
| Lapin Pelti Oy | Manufacturing | 2013 |