| Kosminen Hattara Oy | Other services | 2016 |
| Kotiapu Pirtti ja Piha Oy | Administrative & support | 2026 |
| Kotihoito Lehmus Oy | Health & social care | 2006 |
| Kotikolo Oy | Financial services | 1996 |
| Koulutustoimisto Tunne-Aivot Oy | Information & communication | 1994 |
| Koura Group Oy | Construction | 2026 |
| Kukkakauppa ja Hautaustoimisto Suni Ky | Wholesale & retail | 2006 |
| Kuljetus Henri Alén Ky | Transport & logistics | 1987 |
| Kuljetus Mäxä Oy | Transport & logistics | 2015 |
| Kuljetus Parikka Oy | Transport & logistics | 2017 |
| Kuljetus-Kauko Oy | Transport & logistics | 1991 |
| Kuljetuskarhut Oy | Transport & logistics | 1989 |
| Kuljetusliike A&S Ratas Oy | Transport & logistics | 2019 |
| Kuljetusliike Veikko Mäkinen Oy | Transport & logistics | 1998 |
| Kultaiset Tassut Oy | Wholesale & retail | 2020 |
| Kultakumppanit Oy | Manufacturing | 1987 |
| Kultasepänliike Rantanen Oy | Wholesale & retail | 1978 |
| Kuntokeskus CrossGym Oy | Arts & recreation | 2025 |
| Kuva-Pihla Ky | Wholesale & retail | 1979 |
| Kymenvirran Kala ja Elämys Oy | Agriculture & fishing | 2022 |
| L-Kiinteistöt Oy | Real estate | 2010 |
| Lpt-Consulting Ky | Professional & scientific | 1981 |
| LS Company Oy | Manufacturing | 2018 |
| LVI-Eristys M Stenroos Oy | Construction | 2001 |
| LVI-Tikko Ky | Construction | 2012 |
| LVI-insinööritoimisto Nuutinen Oy | Professional & scientific | 2018 |
| Laatta Center Joensuu Oy | Wholesale & retail | 2006 |
| Lahden Bitumikate Oy | Construction | 2001 |
| Lahden Isäntä Oy | Professional & scientific | 1987 |
| Laukkamäen perhekoti Oy | Health & social care | 2020 |
| Laurko Oy | Construction | 2022 |
| Lava-Team Ky | Manufacturing | 1987 |
| Lehtola Invest Oy | Real estate | 1991 |
| Leipro Oy | Other services | 2009 |
| Lerkkanen Oy | Hospitality | 1990 |
| Lili-Marleena Ky | Hospitality | 1990 |
| LineaPlan Oy | Professional & scientific | 2021 |
| Linnapalvelut Oy | Administrative & support | 2012 |
| Louhintaurakointi Juha Tähkänen Oy | Construction | 2009 |
| LounasHetki Kommandiittiyhtiö | Hospitality | 2001 |
| Love U Mean It Oy | Information & communication | 2014 |
| Lumela Oy | Transport & logistics | 2002 |
| Luontaishoitola Illusia Ky | Other services | 2003 |
| Lusi avoin yhtiö | Hospitality | 2023 |
| Lähiruoka Mroué avoin yhtiö | Wholesale & retail | 1988 |
| MFD Consulting Oy | Professional & scientific | 2013 |
| MP Creatives Oy | Professional & scientific | 2025 |
| MT Isännöinti & Tili Oy | Real estate | 2026 |
| MTS-Konepaja Ky | Professional & scientific | 1984 |
| MV Putkipalvelut Oy | Construction | 2026 |
| Mzl&Am OY | Manufacturing | 2026 |
| MaRaKatto Oy | Construction | 2024 |
| Maalausliike M Piipponen Oy | Construction | 1987 |
| Maansiirto Vesanen Oy | Construction | 1997 |
| Majula Oy | Real estate | 1993 |
| Maken Kalastus Ky | Wholesale & retail | 2012 |
| Maken Metsäpalvelu Oy | Agriculture & fishing | 2020 |
| Marema Ky | Professional & scientific | 1990 |
| Marja-Leenan Kukka ja Hautauspalvelu Ky | Other services | 2014 |
| Marjanen-Invest Ky | Construction | 1989 |
| Markku Ahonen Ky | Wholesale & retail | 1963 |
| Martius Oy | Wholesale & retail | 1989 |
| Marttilan Eläinlääkintä Oy | Professional & scientific | 2023 |
| Marttilan Lastenpalvelut Oy | Health & social care | 2018 |
| Maseme Oy | Real estate | 2017 |
| Maunulan Rakennuspalvelu Oy | Construction | 1997 |
| Max Grilli Oy | Hospitality | 2021 |
| MayJL Industries Oy | Manufacturing | 2010 |
| Me & Martina Oy | Professional & scientific | 2020 |
| Memetic Oy | Information & communication | 2021 |
| Memorosa Oy | Wholesale & retail | 2001 |
| Mer HD Oy | Financial services | 2025 |
| Metsä Hannula Oy | Agriculture & fishing | 2003 |
| Mielimylly Valmennustoimisto Oy | Education | 2008 |
| Mikkelin Rohdos Oy | Wholesale & retail | 2006 |
| Minlia Hoiva Oy | Health & social care | 2025 |
| Miranelly Oy | Wholesale & retail | 2019 |
| Miss Elena Ky Anja Mikkola | Wholesale & retail | 1996 |
| Miss Elena Oy | Wholesale & retail | 2025 |
| Mittametalli Oy | Manufacturing | 2012 |
| Monoteam Oy | Real estate | 1995 |
| Moonsault Software Oy | Information & communication | 2024 |
| Muistotimantti Algordanza Finland Oy | Manufacturing | 2007 |
| Mustikkahaan Huolto Oy | Administrative & support | 1986 |
| Mäxä Group Oy | Real estate | 2026 |
| Nordic Building & Development NBD OY | Construction | 2022 |
| NP Forest Oy | Agriculture & fishing | 2019 |
| Narinc Oy | Professional & scientific | 2008 |
| Necam Beauty Ltd. Oy | Other services | 2002 |
| NexSan-Palvelut Oy | Administrative & support | 2023 |
| Nihvu Investment Oy | Financial services | 2005 |
| NiksiPro Oy | Professional & scientific | 2023 |
| Nokopa Oy | Manufacturing | 2017 |
| Nolua Oy | Construction | 2009 |
| Nordic Deco Oy | Wholesale & retail | 1992 |
| Nordnuc Oy | Professional & scientific | 2025 |
| Noutajakauppa Oy | Wholesale & retail | 2023 |
| Nuottamuikkunen Oy | Manufacturing | 1994 |
| ON-Asusteet Ky | | 1988 |
| OT-Control Oy | Wholesale & retail | 2015 |