| Kb Axel Lindström Ky | Wholesale & retail | 1988 |
| Kb Bokföringsbyrå Nummenmaa Kirjanpitotoimisto Ky | Professional & scientific | 1989 |
| Kb Enström | Wholesale & retail | 1992 |
| Kb Ramsko-Import Ky | Wholesale & retail | 1986 |
| Kb SkoDay Karis Ky | Wholesale & retail | 2007 |
| Kented Kb | Hospitality | 1989 |
| Kiinteistö Oy Astala | Real estate | 2003 |
| Kiinteistö Oy Disponentvillan | Real estate | 1995 |
| Kiinteistö Oy Pohjantie | Real estate | 1972 |
| Kiinteistö Oy Strandpromenaden 20 Ab | Real estate | 1978 |
| Kiinteistö Oy Trikar | Real estate | 1987 |
| Kiinteistö Oy Turun rata | Real estate | 1986 |
| Kiinteistövaikutus KIVA Oy | Real estate | 2021 |
| Kiinteistöyhtiö Rånäs Oy | Real estate | 1989 |
| Kindahl Consulting Oy | Professional & scientific | 2023 |
| Kinson Oy | Construction | 2012 |
| Kitkan Saneeraus Oy | Construction | 2024 |
| Kolmen Voima Oy | Construction | 2016 |
| Kommandiittiyhtiö Iisakki Sipiläinen, om. Iisakki Sipiläinen& Co | Information & communication | 1980 |
| Kommandiittiyhtiö PR, Club & Do It Service Kee - Mies AnteroVuorinen Ky | Other services | 1995 |
| Koneraiser Oy | Administrative & support | 2023 |
| Kontorstjänster Ahlblad Kb - Konttoripalvelut Ahlblad Ky | Information & communication | 1984 |
| Koodikuja Oy | Information & communication | 2020 |
| Korttelilataus Oy | Construction | 2021 |
| Krassi Oy | Transport & logistics | 2025 |
| Ky Karjaan Konepiste, Kb Karis Maskinpunkt Ingmar Siberg | Wholesale & retail | 1985 |
| Ky Kurt Helander Kb | Transport & logistics | 1992 |
| Kylmä- ja Konekeskus P. Ahtiainen Oy | Other services | 1978 |
| LGB Capital Oy Ab | Financial services | 2021 |
| LKJ-Consulting Oy Ltd | Real estate | 1993 |
| Lankalinja Avoin yhtiö | Wholesale & retail | 2006 |
| Leif Bergman Oy | Real estate | 1987 |
| LeoLea Oy | Hospitality | 2024 |
| Life Force Ky | Wholesale & retail | 1965 |
| Lindeum Partners Oy | Wholesale & retail | 2017 |
| Lindrak Oy | Construction | 1990 |
| Little Odd Holdings OY | Financial services | 2020 |
| Liwemedia Oy | Information & communication | 2022 |
| Loistosaneeraus Oy | Construction | 2023 |
| Louhintaliike Veljekset Åkerfelt Oy | Construction | 1977 |
| Lugn&Ro Kiinteistö Oy | Real estate | 2026 |
| Luna Invest Oy | Real estate | 2022 |
| Lyfte AB | Arts & recreation | 2016 |
| Lääkäri avuksi Oy | Health & social care | 2026 |
| Lönnbergs Chiropraktik & Fysioterapi Öppet bolag | Health & social care | 1998 |
| M&P Capital Ab | Real estate | 2010 |
| M.Broman Ab Oy | Wholesale & retail | 2006 |
| MAKO-51 Property OY | Real estate | 2020 |
| ME Multitasking Oy | Construction | 2020 |
| Mahitec Ky | Manufacturing | 2015 |
| Maija Ruoslahti Oy | Professional & scientific | 1980 |
| Malmbacka Vattenandelslag | Water & waste | 1957 |
| Mandarin Spa Oy | Other services | 2013 |
| Mannulus Ky | Professional & scientific | 2012 |
| Martve Oy | Construction | 2012 |
| Maskinservice G-B Ekström Kb | Manufacturing | 1990 |
| Matkaikkuna Oy | Administrative & support | 2013 |
| Mats Grönblom Consulting Oy Ab | Professional & scientific | 2020 |
| Medvoltti Oy | Health & social care | 2021 |
| MegaHash Oy | Information & communication | 2021 |
| Metedo Oy | Administrative & support | 2007 |
| Miko Project OY | Construction | 2021 |
| Milacohunt Oy | Agriculture & fishing | 2016 |
| Millifix Oy | Real estate | 2017 |
| Mini-Trans Oy | Transport & logistics | 2008 |
| Muffes Bygg Ab Oy | Construction | 2019 |
| Muutaman Tonnin Auto Oy | Wholesale & retail | 2022 |
| Muutaman Tonnin Sijoitus Oy | Wholesale & retail | 2025 |
| N3M Group Oy Ab | Professional & scientific | 2006 |
| N3M Infra Oy Ab | Manufacturing | 2012 |
| N3M Power Oy Ab | Construction | 2012 |
| Ninos OY AB | Hospitality | 2022 |
| NLpictures Ab | Information & communication | 2014 |
| NTQ Technic Oy Ab | Manufacturing | 2019 |
| Naarthe Creative Ventures Oy | Health & social care | 2024 |
| Natural Dynamics Oy | Manufacturing | 2021 |
| Nicci-consulting Ky | Arts & recreation | 1992 |
| Nipacon Oy | Construction | 2026 |
| Nivatek Oy | Information & communication | 2020 |
| NixFix Ab | Construction | 2022 |
| Noju Oy | Information & communication | 2020 |
| Nova West Oy | Administrative & support | 1998 |
| Nymad Invest Oy Ab | Transport & logistics | 2020 |
| OWrad Oy | Health & social care | 2019 |
| OY Tbtech AB | Manufacturing | 2012 |
| Onnellisen sepän paja ky | Manufacturing | 2013 |
| Osakemarkkinointi Oy | Real estate | 1968 |
| Oy AD Company Ab | Wholesale & retail | 2007 |
| Oy Alfaboss Ab | Real estate | 1992 |
| Oy Auto-Din Ab | Wholesale & retail | 1980 |
| Oy Ba-Ka Ab | Manufacturing | 2007 |
| Oy Baltic Truffle Ab | Agriculture & fishing | 2009 |
| Oy Borgmaster Ab | Professional & scientific | 1995 |
| Oy Bouquet Garni Ab | Hospitality | 2006 |
| Oy Bäma-Invest Ab | Wholesale & retail | 1989 |
| Oy Casagrande Laboratory Ltd | Professional & scientific | 2011 |
| Oy Casual Constructions Ltd | Professional & scientific | 2019 |
| Oy E Björklöf Ab | Wholesale & retail | 1994 |
| Oy Ekso Ab | Wholesale & retail | 1991 |
| Oy Finnel Ab | Other services | 1966 |