| MaRa Infra OY | Construction | 2021 |
| Maanrakennusliike Pentti J. Väänänen Oy | Construction | 1987 |
| Mafin Oy | Manufacturing | 2022 |
| Mainos Vasara Oy | Professional & scientific | 2018 |
| Mainostoimisto Eebenteam Oy | Professional & scientific | 1992 |
| Majatie Oy | Construction | 1983 |
| Major Rakennus Oy | Construction | 2020 |
| Makumatka Oy JK | Hospitality | 2018 |
| Malmberg Yhtiöt Oy | Professional & scientific | 2020 |
| Marc & Ma Oy | Construction | 2023 |
| Mariefors Horses Oy | Arts & recreation | 2020 |
| Mariefors Open Oy | Health & social care | 2012 |
| Mariefors invest Oy | Professional & scientific | 2024 |
| Marieforsin Juhlatila Oy | Arts & recreation | 2026 |
| Marja-Wiippola Oy | Wholesale & retail | 2019 |
| MasAuto Oy | Wholesale & retail | 2022 |
| MatiCo Oy | Construction | 2017 |
| Maverick Solutions Oy | Manufacturing | 2014 |
| Medicalex Oy | Wholesale & retail | 2022 |
| Mediponte Oy | Health & social care | 1994 |
| Miettinen&Ojanen Invest Oy | Financial services | 2025 |
| Minha Oy | Hospitality | 2013 |
| Miracle Team Oy | Other services | 2005 |
| Mobilverdi Oy | Wholesale & retail | 1993 |
| Monihuolto JT Oy | Other services | 2020 |
| Monitoimitalo Heino Udd Oy | Wholesale & retail | 1984 |
| Mosa Palvelut Oy | Administrative & support | 2011 |
| Moutech Oy | Construction | 2019 |
| Naka Finland Oy | Wholesale & retail | 2018 |
| Nesatec Oy | Construction | 2019 |
| Neteram Oy | Professional & scientific | 2013 |
| Neukkarikone Oy | Wholesale & retail | 2020 |
| Niemisen kengitys ky | Agriculture & fishing | 2019 |
| Nipe Rakennus Oy | Construction | 2017 |
| NoLogic Oy | Professional & scientific | 2011 |
| Nokkonen Invest Oy | Financial services | 2022 |
| Noptek Oy | Construction | 2011 |
| Nordic Wood CK Oy | Wholesale & retail | 2014 |
| Nostinhuolto Pirskanen Oy | Manufacturing | 2017 |
| Nuppulinnan Laboratoriopalvelu Oy | Wholesale & retail | 1996 |
| Nykylasi Oy | Construction | 2008 |
| Ohoi Creative Oy | Professional & scientific | 2017 |
| Ollin Työpalvelut Oy | Administrative & support | 2018 |
| Open Idea Oy | Real estate | 1990 |
| Optiorakennus Oy | Construction | 1992 |
| Oy Baltic Alliance Ab | Wholesale & retail | 1993 |
| Oy Hilkulla Ltd | Real estate | 2012 |
| Oy Landico Ltd | Wholesale & retail | 1998 |
| Oy Laurén Ab | Manufacturing | 1973 |
| Oy Pietaryrtti Ab | Wholesale & retail | 1989 |
| Oy Röpö Ab | Construction | 1994 |
| Oy Tuusulan Impiniemi | Real estate | 1994 |
| Oy Vively Ltd | Education | 2011 |
| PPV Konsultti ja Rakennuspalvelut Oy | Construction | 2022 |
| PR Custom & Service OY | Other services | 2019 |
| Paketo Oy | Wholesale & retail | 1985 |
| Paketo Recycling Oy | Manufacturing | 2016 |
| Palun oy | Construction | 2018 |
| Palvelutaksit Riikonen Oy | Transport & logistics | 2002 |
| Pekka Järvinen Oy LKV | Real estate | 2023 |
| Pelivinkit Oy | Wholesale & retail | 2010 |
| People Presents Oy | Arts & recreation | 2024 |
| Perax Oy | Manufacturing | 1976 |
| Perfect Group HELSINKI avoin yhtiö | Construction | 2012 |
| Pete Markkanen Oy | Manufacturing | 2017 |
| Peten Moottori ja Metalli Oy | Other services | 2022 |
| Petikon Lasi Oy | Construction | 1994 |
| Pientalorakennus Lahin Oy | Construction | 2015 |
| Pikku-Juhanin ryhmis Oy | Education | 2016 |
| Pikkupihlaja Oy | Transport & logistics | 1989 |
| Pinnoitus Helin Oy | Manufacturing | 1991 |
| Pipeset Oy | Construction | 2021 |
| Pizza New Oy | Hospitality | 2024 |
| Post-venta Oy | Manufacturing | 1997 |
| Preciptek Oy | Professional & scientific | 2021 |
| ProTeamCompany Oy | Arts & recreation | 2022 |
| Pulverimaalaus Arola OY | Construction | 2025 |
| Puun Polku Oy | Administrative & support | 2018 |
| Puutarhaset Oy Järvenpää | Wholesale & retail | 2013 |
| Päiväkoti Pikku-Arola Oy | Education | 2022 |
| Riskioptimit Ky | Financial services | 2004 |
| RKR-Maalaus Oy | Construction | 1992 |
| RMO - Rakennus Oy | Construction | 2020 |
| RP Jokinen Oy | Construction | 2024 |
| RS Timpurit Oy | Construction | 2021 |
| Rajalinnan Auto Oy | Other services | 1986 |
| Rajalinnan Yritystalo Oy | Real estate | 2006 |
| Rakennus SEFER Oy | Real estate | 2019 |
| Rakennusliike Rasola Oy | Construction | 2005 |
| Rakennuspalvelu J. Virta Oy | Construction | 2007 |
| Rakennuspalvelu Kouhia Oy | Construction | 2026 |
| Rakennuspalvelu S. Rimmi Ky | Construction | 2007 |
| Ravintola Roze Oy | Hospitality | 2022 |
| Ravintola- ja Tapahtumapalvelu Jari Pakkanen Oy | Hospitality | 2015 |
| Raxaveljet Oy | Construction | 2018 |
| Refstep Oy | Professional & scientific | 2013 |
| Remontointi Jopele Oy | Construction | 2006 |
| Rispekt Oy | Administrative & support | 2024 |
| Rohina Oy | Construction | 1993 |
| Romppis Oy | Wholesale & retail | 2022 |