| Kuljetus Vesa Heikonen Oy | Transport & logistics | 2024 |
| Kuljetusliike Food-Link Oy | Transport & logistics | 1998 |
| Kuljetusliike Sami Lehtinen Oy | Transport & logistics | 2004 |
| Kuljetusliike T&T Varjonen Oy | Transport & logistics | 2012 |
| Kuljetuspalvelu Jukka Rinne Ky | Transport & logistics | 2006 |
| Kylmäkyy Ky | Financial services | 2017 |
| L&S Kiinteistöt Oy | Real estate | 2022 |
| LA Sales Oy | Professional & scientific | 2024 |
| LE-Sweet Oy | Wholesale & retail | 2013 |
| LM Infra Oy | Construction | 2019 |
| LM Konsultointi Oy | Professional & scientific | 2026 |
| LMS Agency Oy | Administrative & support | 2022 |
| LR Farm Equipment Oy | Wholesale & retail | 2020 |
| LVI-Huolto Saarinen Oy | Construction | 2024 |
| LVI-Palvelu Oksanen Oy | Construction | 2024 |
| Laatu Consulting Oy | Professional & scientific | 2023 |
| Lassi Kosonen Oy | Construction | 2007 |
| Liedon Car-Color Oy | Other services | 2004 |
| Linda Saari Oy | Education | 2020 |
| Lingua Holdings Oy | Professional & scientific | 2025 |
| LogiEdu Oy | Education | 2015 |
| Logstep Ky | Professional & scientific | 2011 |
| Loistotec Oy | Construction | 2022 |
| Louhinta ja maanrakennus Salminen Oy | Construction | 2017 |
| Lounais-Suomen Jää Oy | Arts & recreation | 2000 |
| Lounaskahvila Ansku Oy | Hospitality | 2014 |
| LuleMode Oy | Wholesale & retail | 2025 |
| Lulemix Oy | Financial services | 2025 |
| Länsiruutu Oy | Construction | 2023 |
| LättySki Oy | Hospitality | 2022 |
| MG Smart Oy | Administrative & support | 1979 |
| MH-Forest Ky | Agriculture & fishing | 2004 |
| MIproNE Oy | Manufacturing | 2016 |
| MM Investment Oy | Financial services | 2017 |
| MSPV-Konsultit Oy | Information & communication | 1987 |
| MW Woima-Sähkö Oy | Construction | 2025 |
| Maalausliike Marko Oksanen Oy | Construction | 2008 |
| Maanrakennus Henri Nikander Oy | Construction | 2017 |
| Maanrakennus Kivelä Oy | Construction | 1985 |
| Maatilapalvelu M&M Oy | Agriculture & fishing | 2026 |
| Maisemaurakointi Mäkinen Oy | Construction | 2005 |
| Mami Dear Oy | Hospitality | 2024 |
| MappiHai Oy | Construction | 2017 |
| Marin hoiva ja huolenpito Oy | Health & social care | 2024 |
| Markku ja Riitta Seikkula Ky | Other services | 2006 |
| Martesca Oy | Hospitality | 2009 |
| Marzella Oy | Professional & scientific | 2024 |
| Mattelmäki Yhtiöt Oy | Real estate | 1991 |
| Mayor Investment Oy | Real estate | 2022 |
| Measure Solution Oy | Information & communication | 2017 |
| Medi Mikstuura Oy | Wholesale & retail | 2000 |
| Mesera Cranes Finland Oy | Manufacturing | 2009 |
| Metamatik Oy | Construction | 2006 |
| Metsäkuljetus Takkunen Oy | Transport & logistics | 2023 |
| Metsänhoitopalvelut Kauppila oy | Agriculture & fishing | 2024 |
| Mielen taajuudella oy | Health & social care | 2025 |
| Mijacom Oy | Administrative & support | 2024 |
| MikSari oy | Construction | 2022 |
| Mikala Fam Oy | Wholesale & retail | 2026 |
| Mikkolan Sienituote MST Oy | Agriculture & fishing | 1992 |
| Minkä Tähden Oy | Hospitality | 2023 |
| Mistech Oy | Manufacturing | 2022 |
| Monkki Oy | Construction | 2012 |
| Moventus Oy | Other services | 2017 |
| Mums Oy | Manufacturing | 2021 |
| Munkkila II Ky | Agriculture & fishing | 1994 |
| Muovitalli Lehtonen Oy | Manufacturing | 1997 |
| NCT-Service Oy | Manufacturing | 2007 |
| NE Järviset Oy | Construction | 2020 |
| NaavaTec Oy | Construction | 2016 |
| Napakaira Oy | Health & social care | 2006 |
| Navix Family Group Oy | Financial services | 2021 |
| Navix Oy | Manufacturing | 2001 |
| Nemtec Oy | Construction | 2022 |
| Nipe Kaivin OY | Construction | 2025 |
| Niskalenkki Oy | Education | 2024 |
| Nordic Malt Beverages Oy | Wholesale & retail | 2024 |
| Nordic Online Acquisition Oy Ab | Wholesale & retail | 2024 |
| Nova Servo Oy | Professional & scientific | 2014 |
| Nuwel Oy | Administrative & support | 2004 |
| Näkö Kerttu Oy | Health & social care | 2021 |
| OP Koti Lounais-Suomi Oy LKV | Real estate | 1973 |
| Oikitech Oy | Transport & logistics | 2012 |
| Onnistu Oy | Administrative & support | 2024 |
| OptiCOP Oy | Construction | 2026 |
| Optimaa oy | Agriculture & fishing | 1999 |
| Optitila Oy | Agriculture & fishing | 2022 |
| Opus Fide Oy | Construction | 2015 |
| Opus Gratias Oy | Real estate | 2012 |
| Otso Oksanen Oy | Other services | 2020 |
| Oy Dianti Ab | Information & communication | 2002 |
| Oy Viestintätoimisto Kaimaani Ab | Professional & scientific | 1999 |
| PIG-Farmi Oy | Wholesale & retail | 1995 |
| PK Works Oy | Real estate | 2012 |
| PP-Laattamestari Oy | Construction | 2020 |
| Primasan OY | Wholesale & retail | 2017 |
| Paimio Estate Oy | Real estate | 2016 |
| Paimion Autokorjaamo Ky | Other services | 1993 |
| Paimion Hautaustoimisto Kotamäki Oy | Other services | 2009 |
| Paimion Hiekkahuolto Oy | Construction | 1989 |