| Kallahden Pysäköinti II Oy | Real estate | 1991 |
| Kallan & Co Oy | Professional & scientific | 2013 |
| Kallano Oy | Professional & scientific | 2011 |
| Kallasniemi Oy | Professional & scientific | 2023 |
| Kalle Ahtonen Oy | Wholesale & retail | 1996 |
| Kalle Mustonen Oy | Administrative & support | 2022 |
| Kalle Mykrä Terveyspalvelut Oy | Health & social care | 2008 |
| Kallegro Oy | Professional & scientific | 2017 |
| Kallen Autopalvelut Oy | Other services | 2014 |
| Kallen Maalaus Oy | Construction | 2008 |
| Kallenakku Oy | Real estate | 2026 |
| Kallenrinne Oy | Information & communication | 1993 |
| Kalleus Capital Oy | Financial services | 2025 |
| Kalliainen Group Oy | Financial services | 2025 |
| Kallike Oy | Wholesale & retail | 2010 |
| Kallikon Investment Oy | Financial services | 2019 |
| Kallio & Törnroos Management Oy | Professional & scientific | 2022 |
| Kallio Capital Oy | Financial services | 2019 |
| Kallio Coffee Society Oy | Hospitality | 2023 |
| Kallio Company Oy | Financial services | 2025 |
| Kallio Construction Oy | Construction | 2023 |
| Kallio Holding Oy | Financial services | 2021 |
| Kallio Software Oy | Information & communication | 2023 |
| Kallio Tuholaistorjunta Oy | Administrative & support | 2023 |
| Kallio Wines Oy | Hospitality | 2012 |
| Kalliohanka Oy | Financial services | 2002 |
| Kalliokarhu Oy | Professional & scientific | 2021 |
| Kalliolaw Asianajotoimisto Oy | Professional & scientific | 2000 |
| Kalliomantu Oy | Professional & scientific | 2019 |
| Kalliomuikku Oy | Professional & scientific | 2024 |
| Kallion Antiikki Oy | Wholesale & retail | 2001 |
| Kallion Arvokiinteistöt Oy | Real estate | 2000 |
| Kallion Aurinko Oy | Energy | 2023 |
| Kallion Autopesu Oy | Other services | 2022 |
| Kallion Eines ja Virvoke Oy | Hospitality | 2022 |
| Kallion Habita Oy | Real estate | 2003 |
| Kallion Holvi Oy | Hospitality | 2018 |
| Kallion Isännöinti- ja tilitoimisto Oy | Real estate | 1989 |
| Kallion Kantaravintolat oy | Hospitality | 2021 |
| Kallion Kodit Oy | Real estate | 2007 |
| Kallion Kulttuuritalo Oy | Real estate | 2021 |
| Kallion Lukko Oy | Wholesale & retail | 1996 |
| Kallion Muutto, avoin yhtiö | | 1961 |
| Kallion Ompelukone Oy | Professional & scientific | 1989 |
| Kallion Pesula Oy | Other services | 1990 |
| Kallion Pieni Kasvikauppa Oy | Wholesale & retail | 2020 |
| Kallion Raide Oy | Construction | 2010 |
| Kallion Rakennusliike Oy | Construction | 2006 |
| Kallion Rexpat Oy | Construction | 2013 |
| Kallion Sähkö O/y | Construction | 1949 |
| Kallion Tiikeri Oy | Professional & scientific | 2021 |
| Kallion taide ja työ oy | Hospitality | 1996 |
| Kalliopyörä Oy | Wholesale & retail | 1992 |
| Kalliotekniikka Consulting Engineers Oy | Professional & scientific | 1998 |
| Kalljärven Hopearanta Oy | Real estate | 1994 |
| Kalljärven Vesiosuuskunta | Water & waste | 2001 |
| Kallwest Invest Oy | Professional & scientific | 2008 |
| Kalmar Finland Solutions Oy | Manufacturing | 2006 |
| Kalmar Holding Finland Oy | Manufacturing | 2006 |
| Kalmar Oyj | Manufacturing | 2024 |
| Kalmia Medica Oy | Health & social care | 2026 |
| Kalmont Oy | Professional & scientific | 2025 |
| Kaloma Oy | Professional & scientific | 1977 |
| Kalsident Oy | Health & social care | 1996 |
| Kaltekno Oy | Manufacturing | 2010 |
| Kalts Oy | Real estate | 1990 |
| Kalustamo R. Broman Oy | Wholesale & retail | 1945 |
| Kaluste Meskanen Oy | Real estate | 1980 |
| Kaluste Saikkonen Ky | Wholesale & retail | 1988 |
| Kalusteasennus A. Hast Oy | Construction | 2023 |
| Kalusteasennus AA ja puusepäntyöt Oy | Construction | 2021 |
| Kalusteasennus J. Vuorio Oy | Construction | 2025 |
| Kalusteasennus KylMar Oy | Construction | 2012 |
| Kalustetrio Oy | Wholesale & retail | 2021 |
| Kaluuna Oy | Professional & scientific | 1990 |
| Kalvolare Ky | Administrative & support | 2011 |
| Kalvopiste Oy | Professional & scientific | 2010 |
| Kamaa fi Oy | Administrative & support | 2011 |
| Kamara Creations Oy | Information & communication | 2016 |
| Kamavaja Oy | Wholesale & retail | 1989 |
| Kamehameha Oy | Real estate | 2025 |
| Kameli Audio Oy | Arts & recreation | 2020 |
| Kameli Oy | Financial services | 2023 |
| Kameramiehet Oy | Administrative & support | 2020 |
| Kameron Oy | Information & communication | 2009 |
| Kami Consulting Oy | Financial services | 2004 |
| Kamikasi Oy | Transport & logistics | 2022 |
| Kamikaze Trading Oy | Financial services | 2025 |
| Kamil Events Oy | Professional & scientific | 2023 |
| Kamil Investment Oy | Financial services | 2022 |
| Kaminun Oy | Health & social care | 2022 |
| Kammi Group Oy | Professional & scientific | 2023 |
| Kammium Oy | Financial services | 2015 |
| Kamoja Oy | Information & communication | 2024 |
| Kamome Project Oy | Hospitality | 2015 |
| Kamoon Digital Oy | Professional & scientific | 2017 |
| Kamp32 Ky | Other services | 2014 |
| Kampaamo Dorian Oy | Other services | 2026 |
| Kampaamo Heikki Larjos Ky | Other services | 1981 |
| Kampaamo Kris-Mar Tuire Ruotsalainen Ky | Other services | 1991 |