| Kampaamo Meidän olohuone P & M Oy | Other services | 1993 |
| Kampaamo Pulju Oy | Other services | 2014 |
| Kampaamo Salon P & P Oy | Other services | 1994 |
| Kampaamo Shine Oy | Other services | 2016 |
| Kampaamo Tuula Hämäläinen & Co | Other services | 1989 |
| Kampaamo-kauneushoitola Magri Ky | Other services | 1989 |
| Kampaamokauppa Sitruuna Oy | Other services | 1992 |
| Kampanora Oy | Other services | 2020 |
| Kampin Hammaslääkärikeskus Oy | Health & social care | 1983 |
| Kampin Huolto Oy | Administrative & support | 2018 |
| Kampin Karuselli Oy | Arts & recreation | 1987 |
| Kampin Keskus Oy | Real estate | 2002 |
| Kampin Klipoteekki Oy | Other services | 1999 |
| Kampin Komppi Oy | Information & communication | 2004 |
| Kampin Lakiasiaintoimisto Oy | Professional & scientific | 1986 |
| Kampin Laukku Oy | Wholesale & retail | 1993 |
| Kampin Leipomo Oy | Manufacturing | 2012 |
| Kampin Miglia Oy | Hospitality | 2025 |
| Kampin Panimoravintolat Oy | Hospitality | 2005 |
| Kampin Pippuri Oy | Hospitality | 2015 |
| Kampin Prime Oy | Real estate | 2015 |
| Kampin Pukuvuokraus Ky | Administrative & support | 1983 |
| Kampin kiinteistötyöt-Monihuolto Ky | Administrative & support | 1979 |
| Kampin parturi Oy | Other services | 2023 |
| Kampin toimistopalvelut Oy | Real estate | 2024 |
| Kampintorin Antikvaarinen kirjakauppa oy | Wholesale & retail | 1986 |
| Kampizza Oy | Hospitality | 2020 |
| Kamppi Center Holdings Oy | Real estate | 2006 |
| Kamppi Day Spa Oy | Other services | 2025 |
| Kamras Oy | Real estate | 2007 |
| Kamreerintien Pysäköintitalo Oy | Real estate | 1986 |
| Kamteco Invest Oy | Professional & scientific | 2012 |
| Kamu Early Education Oy | Education | 2018 |
| Kamwest Oy Ab | Wholesale & retail | 2000 |
| Kamwest Solutions Oy Ab | Professional & scientific | 1988 |
| Kan Shen Oy | Hospitality | 2008 |
| Kan-Cad Oy | Professional & scientific | 2010 |
| Kanar Transport Oy | Transport & logistics | 2020 |
| Kanari Oy | Wholesale & retail | 2015 |
| Kanarian Consulting Oy | Professional & scientific | 2024 |
| Kanava7 Oy | Hospitality | 2024 |
| Kanavaranta Helsinki Oy | Real estate | 2013 |
| Kandalos Project 1 Oy | Energy | 2024 |
| Kandalos Project 10 Oy | Energy | 2024 |
| Kandalos Project 2 Oy | Energy | 2024 |
| Kandalos Project 4 Oy | Energy | 2024 |
| Kandalos Project 5 Oy | Energy | 2024 |
| Kandalos Project 6 Oy | Energy | 2024 |
| Kandalos Project 7 Oy | Energy | 2024 |
| Kandalos Project 8 Oy | Energy | 2024 |
| Kandalos Project 9 Oy | Energy | 2024 |
| Kandiakatemia Oy | Education | 2009 |
| Kandidaattikustannus Oy | Information & communication | 1980 |
| Kando Oy | Other services | 2005 |
| Kandoo 3D Oy | Information & communication | 2019 |
| Kane Consulting Oy | Professional & scientific | 2007 |
| Kaneli Q Oy | Professional & scientific | 1990 |
| Kanelimamma Oy | Wholesale & retail | 2020 |
| Kanerva Energia Oy | Financial services | 2018 |
| Kang's Trading Oy | Wholesale & retail | 2022 |
| Kangas & Vuorinen Arkkitehdit Oy | Professional & scientific | 2001 |
| Kangas Bros. Innovations Oy | Information & communication | 2008 |
| Kangas Media & Marketing Oy | Professional & scientific | 1990 |
| Kangasalan Teollisuusmaalaus Oy | Manufacturing | 2011 |
| Kangasco Oy | Wholesale & retail | 1972 |
| Kanjoni Oy | Information & communication | 2022 |
| Kankaan Aurinko Oy | Energy | 2023 |
| Kankaanpelastajat Oy | Manufacturing | 2025 |
| Kanki International Oy | Professional & scientific | 1990 |
| Kanlungan Oy | Health & social care | 2019 |
| Kanmani Oy | Wholesale & retail | 2026 |
| Kannelmäen liiketilat Oy | Real estate | 2018 |
| Kannelmäki pizza expres Oy | Hospitality | 2019 |
| Kannisto Wind Oy | Energy | 2024 |
| Kannon-Romu Osakeyhtiö | Wholesale & retail | 1960 |
| Kannus Investment Oy | Financial services | 2011 |
| Kannustin Oy | Education | 1994 |
| Kano Engineering Oy | Information & communication | 2025 |
| Kanoon Production Oy | Professional & scientific | 2006 |
| Kanresta Oy | Hospitality | 1994 |
| Kansakunta Oy | Information & communication | 1998 |
| Kansan Uutiset Oy | Information & communication | 1989 |
| Kansan pitseria Oy | Hospitality | 2025 |
| Kansanauto Oy | Wholesale & retail | 1956 |
| Kansbar Holding Oy | Real estate | 2018 |
| Kansio Consulting Oy | Professional & scientific | 2022 |
| Kanslo Oy | Professional & scientific | 2024 |
| Kanssasijoitusrahasto I Ky | Financial services | 2023 |
| Kanssin Kehitys Oy | Real estate | 2021 |
| Kanta-Helsingin LVI ja Rakennuspalvelu Oy | Construction | 2010 |
| Kanta-Helsingin Tilitoimisto Oy | Professional & scientific | 2010 |
| KantaPass Oy | Information & communication | 2026 |
| KantaTaksi Oy | Transport & logistics | 2026 |
| Kantaja Oy | Professional & scientific | 2021 |
| Kantakaupungin Asunnot Oy | Real estate | 2022 |
| Kantakaupungin Kodit Oy | Real estate | 2013 |
| Kantala Group Oy | Financial services | 2025 |
| Kantalo Oy | Transport & logistics | 2025 |
| Kantama Oy | Financial services | 2008 |
| Kantamestarit Oy | Information & communication | 2000 |