| Liedon kaupunkikiinteistöt Oy | Real estate | 2025 |
| Liedon putki ja rakennus Oy | Construction | 2008 |
| Liedon vuokrapiste Oy | Administrative & support | 2022 |
| Lift Brothers OY | Construction | 2010 |
| Ligens Oy | Professional & scientific | 2019 |
| Liikenne Vesma Oy | Transport & logistics | 2017 |
| Limestone Finland OY | Mining & quarrying | 2023 |
| Limitless Beauty Oy | Wholesale & retail | 2023 |
| Linnatuli Oy | Construction | 2006 |
| Littoisten Kuljetus Oy | Transport & logistics | 2002 |
| LoadMyBook audio books Company Oy LTD | Information & communication | 2021 |
| Lodu Investment Oy | Real estate | 2016 |
| Loimaan Laaturakennus Oy | Construction | 2007 |
| Louhinta Vanhatalo Oy | Mining & quarrying | 2025 |
| Lounapuu Oy | Agriculture & fishing | 2015 |
| Lounaskahvila Kiito Oy | Hospitality | 2007 |
| Lubet Invest Oy | Professional & scientific | 2008 |
| Luonto- ja ympäristötutkimus Envibio Oy | Professional & scientific | 2002 |
| Lähtiset Oy | Wholesale & retail | 2006 |
| Länsi-Suomen Asuntovuokraus Oy | Real estate | 2025 |
| Länsiporras Oy | Manufacturing | 2008 |
| MA-Alihankinta Oy | Manufacturing | 2009 |
| MH-Tilitieto Oy | Professional & scientific | 2024 |
| MJM-Plan oy | Professional & scientific | 2016 |
| Moikkinen OY | Transport & logistics | 2026 |
| MSJ-Automotive Oy | Other services | 2023 |
| MTH Rakennus ja Saneeraus OY | Construction | 2022 |
| MTJ-hoivakiinteistöt Oy | Real estate | 2012 |
| MVP-Rakentajat Oy | Construction | 2023 |
| Maanrakennus Lundgren Oy | Construction | 2006 |
| Maffen Oy | Information & communication | 2026 |
| Magot Oy | Manufacturing | 2005 |
| Mahti Palvelut Oy | Construction | 2024 |
| Mahti Project Oy | Professional & scientific | 2024 |
| Maksimaali Oy | Construction | 1986 |
| Managing Partnership Finland Oy | Professional & scientific | 2006 |
| Marine Diesel Finland Oy | Manufacturing | 1992 |
| Marine Service Finland Oy | Manufacturing | 2021 |
| Marweld Oy | Manufacturing | 1996 |
| Masterok OY | Construction | 2022 |
| MeriTekno Oy | Manufacturing | 2025 |
| Mestarikoti Oy | Construction | 2018 |
| Metalhallinto Oy | Professional & scientific | 2019 |
| Midblock Holding Oy | Financial services | 2018 |
| Mira-Tex Oy | Manufacturing | 1974 |
| Moniurakointi Kata Ky | Construction | 2010 |
| Muutostyöt Oy Tampere | Construction | 1997 |
| My Home Martta Kaira Oy | Wholesale & retail | 2015 |
| Neawelle Beauty OY | Wholesale & retail | 2026 |
| NJM Group Oy | Financial services | 2016 |
| NM Detailing Oy | Other services | 2026 |
| NWH Invest OY | Professional & scientific | 2022 |
| Naantalin Kuljetus Oy | Transport & logistics | 1996 |
| Nakorauta Oy | Wholesale & retail | 1954 |
| Nasse ja Sepe Oy | Administrative & support | 2024 |
| Naulainen Oy | Construction | 2021 |
| Neeme Logistics Oy | Transport & logistics | 2025 |
| Nektek oy | Manufacturing | 2002 |
| NepSydän Oy | Health & social care | 2023 |
| NerdVault Oy | Wholesale & retail | 2026 |
| NewGen Capital Ab | Real estate | 2021 |
| NewGen Holding Ab | Professional & scientific | 2021 |
| Nitrax Oy | Construction | 2024 |
| Nord-Rent Holding Oy | Real estate | 2023 |
| Nord-Rent Oy | Transport & logistics | 2023 |
| Nordic Construction Warranty Oy | Professional & scientific | 2021 |
| Normirakennus Ky | Construction | 2001 |
| Nostopalvelu Simola Oy | Administrative & support | 1990 |
| Numerla Oy | Professional & scientific | 1990 |
| Nummela Group Oy | Construction | 1987 |
| Nuohousvoima Oy | Administrative & support | 2019 |
| Nu’o Hyvä Oy | Real estate | 2017 |
| NvN-Kuljetus Oy | Transport & logistics | 2013 |
| Ohana Kaartemo Oy | Financial services | 2020 |
| Oma Murre Oy | Other services | 2023 |
| OnheN Ghetto Oy | Real estate | 2016 |
| OnnenPuu Päiväkodit Oy | Education | 2024 |
| Optio Isännöinti Oy | Real estate | 2024 |
| Osatek Oy | Wholesale & retail | 1991 |
| Ossi Nieminen Oy | Financial services | 2008 |
| Ottomaani Oy | Wholesale & retail | 1980 |
| Our Gold Oy | Real estate | 2016 |
| OxenEyes Oy | Financial services | 2017 |
| Oy Avenir Foods Ab | Manufacturing | 2026 |
| Oy Dokto Ab | Wholesale & retail | 1995 |
| Oy Finnsusp Ab | Manufacturing | 1979 |
| Oy Giga Computer Ab | Wholesale & retail | 1993 |
| Oy Gigantum Ab | Real estate | 1997 |
| Oy JS-Mandat Ltd | Professional & scientific | 1993 |
| Oy Lapin Hopea Ltd | Construction | 2009 |
| Oy Listello Nordica Ab | Wholesale & retail | 1996 |
| Oy Quality Performance Ltd | Real estate | 2020 |
| Oy Rikomet Ltd | Professional & scientific | 1991 |
| Oy Voluntas Ab | Professional & scientific | 1992 |
| P-Print Oy | Manufacturing | 1991 |
| Piianpeili OY | Other services | 2006 |
| PK-Juhlat Oy | Hospitality | 1990 |
| PLI Bitumikatto Palvelut Oy | Construction | 2022 |
| PM-SÄÄSTÖ Oy | Financial services | 2011 |
| POKA Audio Oy | Wholesale & retail | 2024 |