| KenRom Rakennus Oy | Construction | 2021 |
| Kenai Oy | Other services | 2022 |
| Kenguru Siivous Oy | Administrative & support | 2025 |
| Kenguruvarastot Oy | Professional & scientific | 1996 |
| Kenigbolo Consulting Services Oy | Information & communication | 2022 |
| Kenno Kodit Oy | Construction | 2020 |
| Kennomesiosuuskunta | Agriculture & fishing | 2003 |
| Kennovaara Oy | Professional & scientific | 1995 |
| Kentek Holding Oy | Financial services | 2019 |
| Kenwick Communications Oy | Professional & scientific | 1998 |
| Kenzu Oy | Transport & logistics | 2020 |
| Kera-Invest Oy | Financial services | 2013 |
| Kerabit Aurinkosähkö Oy | Information & communication | 2010 |
| Kerabit Kattoelementit Oy | Construction | 2013 |
| Kerabit Kattohuolto Oy | Administrative & support | 2010 |
| Kerabit Oy | Construction | 2010 |
| KerabitPro Oy | Construction | 2011 |
| Keravan Erikoishammaslääkäriasema Oy | Health & social care | 2018 |
| Keravan Sisustus-Timpurit Oy | Construction | 1994 |
| Kerbel Interior Design Oy | Construction | 2026 |
| Kerger Oy | Construction | 2021 |
| Kerilandia Oy | Information & communication | 2004 |
| Kerimaan Lomakeskus Oy | Hospitality | 1995 |
| Kerios Oy | Professional & scientific | 2011 |
| Kerkivä Ky | Wholesale & retail | 2009 |
| Kermotek Oy | Construction | 2022 |
| Kerolampi Oy | Real estate | 1989 |
| Kerrosserviisi Oy | Hospitality | 2015 |
| Kertomo Tuotanto Avoin Yhtiö | Information & communication | 2013 |
| Kerttck Oy | Construction | 2018 |
| Kerttunki Oy | Financial services | 2014 |
| Keshari Oy | Hospitality | 2024 |
| Kesil-Koti Oy | Information & communication | 1996 |
| Keski-Uudenmaan Autopesu Ky | Other services | 1985 |
| Keski-Uudenmaan Ilmastointi Oy | Construction | 2006 |
| Keskinäinen kiinteistöosakeyhtiö Vantaanlaakson Halli Oy | Real estate | 2006 |
| Kesma Oy | Professional & scientific | 2020 |
| Kessier Consulting Oy | Professional & scientific | 2022 |
| Kessu Oy | Wholesale & retail | 1991 |
| Kesti Group Oy | Financial services | 2016 |
| Kestolapio OY | Construction | 2026 |
| Kesäkylä Koivikko Oy | Real estate | 1956 |
| Kesäkylä Koivikon vesiosuuskunta | Water & waste | 2008 |
| Ketola Dev Oy | Information & communication | 2024 |
| Ketomella Oy | Real estate | 1980 |
| Ketterä Media Oy | Professional & scientific | 2019 |
| Kettinen International Oy | Wholesale & retail | 1988 |
| KettuConsulting Oy | Professional & scientific | 2013 |
| Kevra Oy | Wholesale & retail | 1978 |
| Kevyesti.fi Oy | Information & communication | 2022 |
| Kevytvaunu Oy | Professional & scientific | 1970 |
| Kewl Oy | Information & communication | 2020 |
| Khao Hom Oy | Wholesale & retail | 2014 |
| Khinda Oy | Hospitality | 2006 |
| KhosroniaDental Oy | Health & social care | 2017 |
| Kickstart 198 Oy | Professional & scientific | 2006 |
| Kide Digital Oy | Information & communication | 2026 |
| Kidecenter Oy | Wholesale & retail | 2021 |
| Kidre Oy | Wholesale & retail | 2024 |
| Kiekko-Vantaa Hockey Oy | Arts & recreation | 2007 |
| Kielo Investment Oy | Professional & scientific | 2017 |
| Kiila & Kärki Oy | Education | 2020 |
| Kiiltävä Koti Oy | Administrative & support | 2024 |
| Kiiltävävaha Oy | Administrative & support | 2025 |
| Kiilunen agentuuri Oy | Construction | 2017 |
| Kiimingin Pekan Asennus KPA Oy | Construction | 1990 |
| Kiin Building Oy | Construction | 2019 |
| Kiint Oy Maarukankulma | Real estate | 2005 |
| Kiint. Oy Hakkilankaari | Real estate | 1988 |
| Kiinteistö Elmeri Oy | Construction | 2021 |
| Kiinteistö Kelatie 15 Ky | Real estate | 1988 |
| Kiinteistö MAN Oy | Real estate | 2026 |
| Kiinteistö Oy Anitrala | Administrative & support | 1989 |
| Kiinteistö Oy Autoaitta | Real estate | 1946 |
| Kiinteistö Oy Aviatontti I | Real estate | 2017 |
| Kiinteistö Oy Aviatontti II | Real estate | 2017 |
| Kiinteistö Oy Aviatontti III | Real estate | 2017 |
| Kiinteistö Oy BH Lahti | Real estate | 2019 |
| Kiinteistö Oy Bastukärr Logistics | Real estate | 2024 |
| Kiinteistö Oy Bauhaus Espoo | Real estate | 2006 |
| Kiinteistö Oy Bauhaus Oulu | Real estate | 2007 |
| Kiinteistö Oy Bauhaus Pirkkala | Real estate | 2003 |
| Kiinteistö Oy Bauhaus Raisio | Real estate | 2001 |
| Kiinteistö Oy Bauhaus Vantaa | Real estate | 2000 |
| Kiinteistö Oy Cleanland | Real estate | 2010 |
| Kiinteistö Oy Espoon Friisikalliontie 32 | Real estate | 2008 |
| Kiinteistö Oy Espoon Kulttuuriparkki | Real estate | 2020 |
| Kiinteistö Oy Espoon Peruskauppa | Real estate | 2018 |
| Kiinteistö Oy Evitskog Handelsgård | Real estate | 1991 |
| Kiinteistö Oy Factory 02 | Real estate | 2026 |
| Kiinteistö Oy Firan Perusyhtiö 1 | Real estate | 2023 |
| Kiinteistö Oy Fjälltomten | Real estate | 2011 |
| Kiinteistö Oy Haminan Tuuliviiri | Real estate | 1991 |
| Kiinteistö Oy Hangon Hopearanta | Real estate | 1955 |
| Kiinteistö Oy Heinolan Patruunatalo | Real estate | 2026 |
| Kiinteistö Oy Heinolan maalaiskunnan Kivalahti | Real estate | 1990 |
| Kiinteistö Oy Helsingin Nilsiänkatu 8 | Real estate | 2017 |
| Kiinteistö Oy Herttoniemen Laivalahdenkatu 4 A | Real estate | 2000 |
| Kiinteistö Oy Hiirakkotie 6 | Real estate | 1970 |
| Kiinteistö Oy Hitsaajankadun Paikoitus | Real estate | 2005 |