| Keisari Ravintola Oy | Hospitality | 2024 |
| Keisarin Safka Oy | Hospitality | 2026 |
| Keittiövisio Oy | Wholesale & retail | 2026 |
| Kejotek Oy | Real estate | 1987 |
| Keli Clothing Oy | Manufacturing | 2016 |
| Kello- ja Kultaliike Teppo Lampi Kommandiittiyhtiö | Wholesale & retail | 1985 |
| Kelloliike Salonen Oy | Wholesale & retail | 2011 |
| Kelloneuvos Oy | Wholesale & retail | 2016 |
| Kellotae Oy | Wholesale & retail | 2023 |
| Keltainen Lintu Oy | Arts & recreation | 2019 |
| Kelviikki Oy | Real estate | 1975 |
| Kemppainen Holding Oy | Administrative & support | 2022 |
| Kemppainen Konsultointi Palvelut Oy | Administrative & support | 2024 |
| Kengityspalvelu Kai Kumanto Oy | Agriculture & fishing | 2024 |
| Kenkä Lehtonen & Kumpp. | Wholesale & retail | 1970 |
| Kenttäviiva Oy Automaatio | Professional & scientific | 2006 |
| Kentäntie 8 Oy | Construction | 2019 |
| Kertalaaki Oy | Professional & scientific | 2024 |
| Kerttulin Kievari Oy | Hospitality | 2014 |
| Keräsaari Oy | Real estate | 1972 |
| Keski-Suomen Tasku Oy | Health & social care | 1990 |
| Keskinäinen Kiinteistöosakeyhtiö Lomapetsor | Administrative & support | 2008 |
| Keskivaihe Oy | Financial services | 2022 |
| Keskusautohalli Oy | Wholesale & retail | 2002 |
| Keskuspalatsin liikehuoneistot Oy | Real estate | 2025 |
| Keskuspalatsin varastot Oy | Real estate | 2025 |
| Kestilän Liiketalo Oy | Financial services | 2020 |
| Kesälahden Rakennus Oy | Construction | 1975 |
| Kesällit Oy | Administrative & support | 2023 |
| Kesäpäivät Sports Oy | Arts & recreation | 2020 |
| Ketarantien Palvelu Oy | Real estate | 2022 |
| Ketju Yhtiöt Oy | Real estate | 2011 |
| Ketovuori Oy | Education | 2022 |
| Kevyemmin Oy | Wholesale & retail | 2026 |
| KevyemminProducts Oy | Manufacturing | 2026 |
| Key Advisors Oy | Professional & scientific | 2020 |
| Khalil Shahramian Oy | Education | 2019 |
| Khizer & Zimal Oy | Hospitality | 2026 |
| Kiano Group Oy | Manufacturing | 2025 |
| Kide Health Solutions Oy | Professional & scientific | 2025 |
| Kiekkoshop Turku Oy | Wholesale & retail | 2019 |
| Kiekurakimmat avoin yhtiö | Other services | 1990 |
| Kielipalvelu Hawas Oy | Professional & scientific | 2016 |
| Kielipalvelu Pyramids Oy | Professional & scientific | 2010 |
| Kieliranta Oy | Professional & scientific | 2023 |
| Kielo & kumpp. Oy | Hospitality | 2024 |
| Kielo AR Service Oy | Administrative & support | 2017 |
| Kielo Aalto Holding Oy | Financial services | 2015 |
| Kielo Aalto Oy | Real estate | 2006 |
| Kielo Aura Oy | Financial services | 2015 |
| Kielo Auto Holding Oy | Real estate | 2010 |
| Kielo Auto Oy | Real estate | 2008 |
| Kielo Big Box Holding Oy | Real estate | 2010 |
| Kielo Big Box Oy | Real estate | 2011 |
| Kielo Car Oy | Professional & scientific | 2021 |
| Kielo Eteläkauppatori 4 Oy | Real estate | 2012 |
| Kielo Helsinki Oy | Real estate | 2007 |
| Kielo Holding 10 Oy | Real estate | 2016 |
| Kielo Holding 11 Oy | Real estate | 2016 |
| Kielo Holding 7 Oy | Professional & scientific | 2021 |
| Kielo Holding 8 Oy | Real estate | 2016 |
| Kielo Holding 9 Oy | Real estate | 2016 |
| Kielo Hämeenlinnan Sibeliuksenkatu 2 Oy | Real estate | 2012 |
| Kielo Itäpuisto 7 Oy | Real estate | 2012 |
| Kielo Jyväskylä Holding Oy | Professional & scientific | 2026 |
| Kielo Jyväskylä Oy | Professional & scientific | 2017 |
| Kielo Kampus Oy | Professional & scientific | 2026 |
| Kielo Keravan Kauppakaari Oy | Real estate | 2012 |
| Kielo Keskus Oy | Professional & scientific | 2026 |
| Kielo Kouvolan Pohjoislaakso Oy | Real estate | 2012 |
| Kielo Kuopio Oy | Professional & scientific | 2021 |
| Kielo Lappeenranta Oy | Professional & scientific | 2026 |
| Kielo Light Oy | Professional & scientific | 2021 |
| Kielo Mikkelin Hallitustori Oy | Real estate | 2012 |
| Kielo Mix Oy | Professional & scientific | 2021 |
| Kielo Office Holding Oy | Professional & scientific | 2026 |
| Kielo Office Oy | Professional & scientific | 2026 |
| Kielo Oulu Oy | Professional & scientific | 2021 |
| Kielo Porin Itäpuisto 11 Oy | Real estate | 2012 |
| Kielo Satakansa Oy | Real estate | 2012 |
| Kielo Tampere Oy | Professional & scientific | 2021 |
| Kiertomaa Oy | Water & waste | 2016 |
| Kii-Tex Oy | Wholesale & retail | 1948 |
| Kiiboard Oy | Arts & recreation | 2014 |
| Kiikun Huolto Oy | Real estate | 1972 |
| KiiltoClean Oy | Manufacturing | 2002 |
| Kiina-Suomi Tuonti ja Vienti Oy | Hospitality | 2004 |
| Kiinteistö Kaukonen Oy | Real estate | 2026 |
| Kiinteistö Osakeyhtiö Itäharjunkatu 33 | Real estate | 2023 |
| Kiinteistö Oy Airistonkulma | Real estate | 1989 |
| Kiinteistö Oy Aittikoski | Real estate | 2018 |
| Kiinteistö Oy Akselintie 1 Turku | Real estate | 2016 |
| Kiinteistö Oy Aresera | Real estate | 2016 |
| Kiinteistö Oy Auramo-Talo | Real estate | 1987 |
| Kiinteistö Oy Auran Länsi-Suomi 1 | Real estate | 2024 |
| Kiinteistö Oy Auran Pohjois-Suomi 1 | Real estate | 2023 |
| Kiinteistö Oy Auran Uusimaa 2 | Real estate | 2023 |
| Kiinteistö Oy Auran Uusimaa 3 | Real estate | 2023 |
| Kiinteistö Oy Auran Uusimaa 4 | Real estate | 2023 |
| Kiinteistö Oy Auran Uusimaa 5 | Real estate | 2023 |