| Leo Capital Europe Fund I GP Oy | Helsinki | 2023 |
| Leo Capital Europe Fund I Ky | Helsinki | 2024 |
| Leo Capital Europe Oy | Helsinki | 2023 |
| Leo Holdings Oy | Helsinki | 2023 |
| Leo Management Oy | Joensuu | 2024 |
| Leo properties Oy | Helsinki | 2024 |
| LeonX Ventures Oy | Espoo | 2025 |
| Leonaarni Oy | Helsinki | 2023 |
| Leonardo Capital Oy | Helsinki | 2021 |
| Leonea Holding Oy | Rauma | 2023 |
| Leopolis Oy | Helsinki | 2026 |
| Leossi Oy | Turku | 2015 |
| Leovian Oy | Kangasala | 2025 |
| Lep hr-holding Oy 1 | Ikaalinen | 2017 |
| Leppähaara Oy | Littoinen | 2023 |
| Leppälän Varanto Holding Oy | Naantali | 2026 |
| Leppänen Sales Oy | Helsinki | 2024 |
| Leppäniemi Investment Management Oy | Vanhalinna | 2018 |
| Leppäranta Holding Oy | Tammela | 2024 |
| Leppäranta Invest Oy | Helsinki | 2023 |
| Leppäsenkorpi Oy | Vantaa | 2020 |
| Leppävaaran Notariaatti Oy | Espoo | 1987 |
| Lepset Holding Oy | Veikkola | 2025 |
| Lepsu Holding Oy | Keltakangas | 2024 |
| Lepus Asset Management Oy | Pirkkala | 2016 |
| Lepuuttaja Oy | Tampere | 2011 |
| Lerad Ab | Helsinki | 2021 |
| Lerainvest Oy | Tuusula | 1986 |
| Leri Holding Oy | Helsinki | 2013 |
| Lerita Ab | Mariehamn | 1987 |
| Lerne Oy | Helsinki | 2007 |
| Les Choupettes Oy | Kärrby | 2021 |
| Les Iles Oy | Kirkkonummi | 2012 |
| Lesirkka Oy | Turku | 1999 |
| Leskinen Capital Oy | Helsinki | 2019 |
| Leskisen 2456 Oy | Helsinki | 2007 |
| Lesli Oy | Rovaniemi | 2020 |
| Lesshouse Oy | Tampere | 2022 |
| Let's Boogie Oy | Helsinki | 2024 |
| Letku & Klemmari Holding Oy | Kokkola | 2019 |
| Leton Viisikko Oy | Kalajoki | 2009 |
| LetsCap Oy | Nokia | 2016 |
| Leukaperä Capital Oy | Helsinki | 2026 |
| Leuku Capital Oy | Oulu | 2013 |
| Leva Group Oy | Pyhäsalmi | 2026 |
| Levanki Oy | Pirkkala | 2021 |
| Levi Capital Oy | Lappeenranta | 2008 |
| Leviathan Oy | Helsinki | 2005 |
| Levidus Oy | Helsinki | 1983 |
| Levinhelmi Oy | Kittilä | 2025 |
| Leviter Invest Oy | Helsinki | 2024 |
| Levolaks Oy | Espoo | 2020 |
| Lex Rahoitus Oy | Turku | 2026 |
| LexMitts Ab | Helsinki | 2001 |
| Lexanna Oy | Espoo | 2018 |
| Lexe Oy | Espoo | 2011 |
| Lexington & Co Oy | Helsinki | 2025 |
| Lexir Oy | Kauniainen | 2015 |
| Lexitoria Oy | Vaasa | 1999 |
| Lexlex Oy | Espoo | 2016 |
| Lexpoint Finance Oy | Helsinki | 2021 |
| Lexpoint Group Oy | Helsinki | 2020 |
| LiM Consilium Oy | Helsinki | 2016 |
| LiabilityMan Oy | Kauniainen | 2026 |
| Liakka City Invest Oy | Tornio | 2025 |
| Lian Holding Oy | Espoo | 2006 |
| Liang Heritage Ventures Oy | Helsinki | 2025 |
| Lianrai Oy | Lahti | 2013 |
| Liber Finance Oy | Osoite Tuntematon | 2016 |
| Liberta Ventures Oy | Helsinki | 2023 |
| Libertad Oy | Helsinki | 2018 |
| Libertas Oy | Helsinki | 2024 |
| Liberum Capital Oy | Helsinki | 2003 |
| Librico Ab | Lemland | 1990 |
| Lidea Invest Oy | Tampere | 2026 |
| Lieksan Hienola Oy | Joensuu | 1993 |
| Lielel Oy | Haveri | 2026 |
| Liesegang Oy | Naantali | 2012 |
| Lieskahdus Oy | Herrala | 1992 |
| Lievox Oy | Jääli | 1987 |
| Lifeisthelife Oy | Oulu | 2021 |
| Lifeline Ventures Fund I Ky | Helsinki | 2012 |
| Lifeline Ventures Fund II Ky | Helsinki | 2014 |
| Lifeline Ventures Fund III Ky | Helsinki | 2016 |
| Lifeline Ventures Fund IV Ky | Helsinki | 2019 |
| Lifeline Ventures Fund Management Oy | Helsinki | 2012 |
| Lifeline Ventures Fund V Feeder Ky | Helsinki | 2023 |
| Lifeline Ventures Fund V Ky | Helsinki | 2023 |
| Lifeline Ventures GP I Oy | Helsinki | 2012 |
| Lifeline Ventures GP III Oy | Helsinki | 2015 |
| Lifeline Ventures GP IV Oy | Helsinki | 2019 |
| Lifeline Ventures GP V Oy | Helsinki | 2023 |
| Lifeline Ventures Investment VI GP Oy | Helsinki | 2025 |
| Lifeline Ventures Investment VI Ky | Helsinki | 2025 |
| Lifeline Ventures VI E&O Feeder Ky | Helsinki | 2025 |
| Lifeline Ventures VI Feeder Ky | Helsinki | 2025 |
| Lifeline Ventures VI PPL Feeder Ky | Helsinki | 2026 |
| Lifeseed Oy | Hamina | 1995 |
| Liflender Holdings Ab | Tammisaari | 2020 |
| Light Years Ahead Oy | Tampere | 2022 |