| Lunnelie Industries Oy | Manufacturing | 2017 |
| Luo Mainos Oy | Other services | 2023 |
| Luo Studio Oy | Education | 2021 |
| Luoman Tilapalvelut Oy | Arts & recreation | 2018 |
| Luonnon Luomaa Oy | Agriculture & fishing | 2021 |
| Luontaistuote Leena Laukkanen Oy | Wholesale & retail | 1999 |
| Luoston-Kerttuli Oy | Hospitality | 1997 |
| Luotisuora Oy | Construction | 2023 |
| Luova toimisto Ranka Oy | Professional & scientific | 2014 |
| Luowuudenlähde Oy | Arts & recreation | 2006 |
| Luuriputki Oy | Construction | 2020 |
| Luuvartti Oy | Information & communication | 1989 |
| Luuvitonen Oy | Arts & recreation | 2024 |
| Luvent oy | Construction | 2022 |
| Luxury Hippie Oy | Professional & scientific | 2018 |
| Luxwood Oy | Wholesale & retail | 2020 |
| Lvi-Tolvanen Oy | Construction | 2020 |
| Lvis-BRAREMONTTICOM Oy | Construction | 2019 |
| Lyhis Oy | Construction | 2021 |
| Lynnect Oy | Wholesale & retail | 2023 |
| Lyöttilän Vesihuolto-osuuskunta | Water & waste | 2019 |
| Lämminlautanen Oy | Hospitality | 2022 |
| Lämpö Tuonti Oy | Construction | 2019 |
| Lämsä Oy | Manufacturing | 1989 |
| Länsi-Lapin Ympäristötekniikka Oy | Construction | 2020 |
| Länsi-Suomen Energiaremontit Oy | Real estate | 2021 |
| Länsi-Suomen Kiinteistökehitys Oy | Real estate | 2018 |
| Länsi-Suomen Laki ja Kiinteistö Oy | Professional & scientific | 2022 |
| Länsi-Uudenmaan Ilmanvaihtourakointi Ky | Construction | 2011 |
| Länvest Oy | Construction | 2020 |
| Lääkärivoimat oy | Health & social care | 2021 |
| M & M Ikonen Oy | Financial services | 1981 |
| M Hook Oy | Construction | 2022 |
| M&C Solutions Oy | Administrative & support | 2021 |
| M&J Spa Oy | Other services | 2020 |
| M&M Multisales Oy | Wholesale & retail | 2023 |
| M&M Technology Oy | Information & communication | 2022 |
| M&Y Asia Food Oy | Wholesale & retail | 2020 |
| M-Kauppa Uurainen Oy | Wholesale & retail | 2017 |
| M-Space Nordic Oy | Construction | 2015 |
| M-Tuokkari Oy | Wholesale & retail | 2016 |
| M-flow Finland Oy | Information & communication | 2021 |
| M. Alexandra Media Oy | Arts & recreation | 2024 |
| M. Rantakylä Oy | Financial services | 2009 |
| M.M.M.-Rakennus OY | Construction | 2016 |
| M3 Kotiapu Oy | Other services | 2021 |
| MAK Contact Oy | Financial services | 2020 |
| MALA Invest Oy | Real estate | 2019 |
| Mamihu OY | Water & waste | 2022 |
| MANS Group Oy | Professional & scientific | 2019 |
| Manu Trading OY Ltd | Professional & scientific | 2021 |
| MAPP Monialapalvelu Pesonen Oy | Professional & scientific | 2008 |
| Marger OY | Construction | 2016 |
| MARICI Finland Oy | Manufacturing | 2019 |
| MARWENDO Oy | Construction | 2018 |
| Mass Energy OY AB Ltd | Wholesale & retail | 2019 |
| MASS Holding Oy | Other services | 2020 |
| MAT kuljetuspalvelut oy | Transport & logistics | 2022 |
| MB Fix Oy | Manufacturing | 2022 |
| MBM Group Oy | Construction | 2019 |
| MBMY Oy | Hospitality | 2019 |
| MBuilding Services Oy | Professional & scientific | 2019 |
| MC-Cars Oy | Wholesale & retail | 2015 |
| MD Market Oy | Wholesale & retail | 2021 |
| MDG Group Oy | Construction | 2023 |
| MDS Rakennus Oy | Construction | 2016 |
| ME Group SPC Finland Oy | Wholesale & retail | 2021 |
| ME Projekti Oy | Construction | 2024 |
| Medaol OY | Hospitality | 2015 |
| Melmar Rakennus OY | Professional & scientific | 2021 |
| MESK strech-katto Oy | Construction | 2015 |
| METALVAR proizvodno, gradbeno, trgovsko in storitveno podjetje d.o.o., Suomen sivuliike | Manufacturing | 2011 |
| MFX MANPOWER Oy | Administrative & support | 2017 |
| MGR Trade Oy | Wholesale & retail | 2020 |
| MH Costa Oy | Hospitality | 2022 |
| Milleniumrakennus OY | Construction | 2019 |
| Miv Capital OY | Administrative & support | 2024 |
| MJB-invest Ekenäs Ab | Real estate | 2005 |
| MJJ-Autot Oy | Wholesale & retail | 2022 |
| MJO Sales Oy | Extraterritorial | 2020 |
| MK MOTORS Oy | Other services | 2017 |
| MKJ Group Oy | Transport & logistics | 2021 |
| MKK Service Oy | Construction | 2009 |
| MKY kuljetus Oy | Construction | 2015 |
| ML Carfix Oy | Wholesale & retail | 2021 |
| ML Mikon Metallijalostus Oy | Wholesale & retail | 1995 |
| ML Somemedia Oy | Professional & scientific | 2023 |
| ML-Palokatko Oy | Construction | 2023 |
| MLA Niemenharju Oy | Wholesale & retail | 2019 |
| MM Office Oy | Wholesale & retail | 1999 |
| MMI-Invest Oy | Construction | 2010 |
| MMW-Kiinteistöt Oy | Construction | 2007 |
| MNA Holdings Oy | Financial services | 2023 |
| MOB camps oy | Arts & recreation | 2021 |
| Moderni Rakennusliike OY | Construction | 2022 |
| MP Sales OY | Arts & recreation | 2020 |
| MPM Automation Oy | Manufacturing | 2014 |
| MQ Retail AB, Filial i Finland | Wholesale & retail | 2011 |
| MRH Investments Oy | Professional & scientific | 2023 |
| MRT Uusimaa Oy | Construction | 2021 |