| Konsulttiyhtiö Leimu Oy | Health & social care | 2019 |
| Kontio Renkaat Oy | Manufacturing | 2015 |
| Konttinen-Yhtiöt Oy | Professional & scientific | 2018 |
| Konttiranta Ky | Real estate | 2001 |
| Kontu Oy Pohjois-Savo | Real estate | 2019 |
| Konuta Oy | Administrative & support | 2026 |
| KooKoo Media Oy | Information & communication | 2025 |
| Koodi-Kalle Oy | Information & communication | 2016 |
| KopterLens Oy | Professional & scientific | 2017 |
| KorPat Oy | Transport & logistics | 2025 |
| Korhonen Consulting Ky | Information & communication | 2012 |
| Korianteri Oy | Transport & logistics | 2024 |
| KorjaamoKamut Oy | Other services | 2024 |
| Korjaussuunnittelu ja Rakennuttajapalvelu SepAn Oy | Professional & scientific | 2019 |
| Korpi Venture Oy | Professional & scientific | 2024 |
| Korpimotelli Timo Juvani Ky | Hospitality | 1989 |
| Korpitohtori Oy | Health & social care | 2020 |
| Korpitupa Oy | Real estate | 2002 |
| Korvela Group Oy | Wholesale & retail | 2022 |
| Korvela Invest Oy | Transport & logistics | 2023 |
| Koski-Laiva Oy | Transport & logistics | 1996 |
| Kosti Karhunen Ky | Wholesale & retail | 1990 |
| Koti kaikille Oy | Real estate | 2025 |
| Koti- ja Monipalvelu Ilona Oy | Health & social care | 2025 |
| Koti- ja hoivapalvelu Tiina Oy | Health & social care | 2026 |
| KotiSenior Oy | Health & social care | 2020 |
| Kotihoito Hilla Oy | Health & social care | 2024 |
| Kotihoito Saga Oy | Health & social care | 2009 |
| Kotileena Oy | Administrative & support | 2007 |
| Kotipaikka Oy | Health & social care | 2008 |
| Kotipalvelu Pajunkissa Oy | Administrative & support | 2014 |
| Kotipalvelu Päivinpaiste Oy | Health & social care | 2025 |
| Kotiuttajat Oy | Real estate | 2021 |
| Kotivuokra Oy | Real estate | 2018 |
| Kotkala Oy | Financial services | 2022 |
| Koulutus ja matkailu Selander Oy | Professional & scientific | 1998 |
| Koulutus- ja viestintäpalvelut Tahto Ky | Education | 2007 |
| Kovosa Oy | Construction | 2021 |
| Kristalli ikkunat Oy | Construction | 2022 |
| Krition Oy | Information & communication | 2024 |
| Kroinilan Hoitokoti Oy Kotisairaanhoito ja Kotiapu | Real estate | 1992 |
| Kuava Oy | Professional & scientific | 2007 |
| Kubios Oy | Information & communication | 2016 |
| Kuirin taksitiimi Ky | Transport & logistics | 2015 |
| Kuitumyynti Naapurinvaara Oy | Manufacturing | 1987 |
| Kuivinniemi Capital Oy | Real estate | 2022 |
| Kuivis Oy | Health & social care | 2022 |
| Kujeco Ky | Wholesale & retail | 2012 |
| Kukka ja sidonta Rosanna Ky | Wholesale & retail | 2005 |
| Kukka, Sidonta ja Lahja Josefina Ky | Wholesale & retail | 1998 |
| Kukkapaja Floretta Oy | Wholesale & retail | 2005 |
| Kukkastudio Valo Oy | Wholesale & retail | 2025 |
| Kukon Luukut Oy | Real estate | 2024 |
| Kuljetus Grönberg Oy | Transport & logistics | 2005 |
| Kuljetus Hannu Heikkinen Ky | Transport & logistics | 1996 |
| Kuljetus Harri Onatsu Oy | Transport & logistics | 2020 |
| Kuljetus J & E Virranniemi Oy | Transport & logistics | 1978 |
| Kuljetus J Tiusanen Oy | Transport & logistics | 2007 |
| Kuljetus J&JJ ky | Transport & logistics | 2005 |
| Kuljetus J. Leppänen Oy | Transport & logistics | 2014 |
| Kuljetus Jukka Heiskanen Ky | Transport & logistics | 2012 |
| Kuljetus K. Toivanen Oy | Construction | 2009 |
| Kuljetus Knuuti Oy | Transport & logistics | 2016 |
| Kuljetus Kukkonen Oy | Transport & logistics | 1981 |
| Kuljetus Kärki Oy | Transport & logistics | 2012 |
| Kuljetus Kärkkäinen Oy | Transport & logistics | 1994 |
| Kuljetus La-Ju oy | Transport & logistics | 2025 |
| Kuljetus Marko Tuovinen Ky | Transport & logistics | 2013 |
| Kuljetus Mika Kankkunen Ky | Transport & logistics | 2001 |
| Kuljetus Mika Mykkänen Oy | Transport & logistics | 2001 |
| Kuljetus Perhonen Oy | Transport & logistics | 1994 |
| Kuljetus T Suhonen Oy | Transport & logistics | 2023 |
| Kuljetus Tero Tiihonen Oy | Transport & logistics | 2013 |
| Kuljetus Tintti Oy | Real estate | 1998 |
| Kuljetus Tommi Miettinen Oy | Transport & logistics | 2015 |
| Kuljetus Variant Oy | Transport & logistics | 2022 |
| Kuljetus Weeman Ky | Transport & logistics | 1998 |
| Kuljetusliike H. Miettinen Oy | Transport & logistics | 1994 |
| Kuljetusliike H. Väätäinen Oy | Transport & logistics | 2026 |
| Kuljetusliike Jari Kärki Ky | Transport & logistics | 1995 |
| Kuljetusliike M Hynninen Ky | Transport & logistics | 1985 |
| Kuljetusliike M Räsänen Oy | Transport & logistics | 1982 |
| Kuljetusliike Martti Säkkinen Oy | Transport & logistics | 1996 |
| Kuljetusliike Mikko Korhonen Oy | Transport & logistics | 1991 |
| Kuljetusliike One Way Oy | Real estate | 1996 |
| Kuljetusliike P Halonen Oy | Transport & logistics | 1997 |
| Kuljetusliike P.J. Seppälä Ky | Transport & logistics | 1989 |
| Kuljetusliike Petri Tuovinen Oy | Transport & logistics | 2010 |
| Kuljetusliike Savoline Oy | Transport & logistics | 2010 |
| Kuljetusliike Seppo Rissanen Oy | Transport & logistics | 1990 |
| Kuljetusliike Tiainen & Kni | Transport & logistics | 1984 |
| Kuljetusliike Turunen Ky | Transport & logistics | 1977 |
| Kuljetuspalvelu J Heimonen Ky | Transport & logistics | 2008 |
| Kuljetuspalvelut Kettu Laitinen Oy | Transport & logistics | 2008 |
| Kultainentalo OY | Wholesale & retail | 2018 |
| Kulttuurikeinu Osk | Arts & recreation | 2018 |
| Kulussa Oy | Transport & logistics | 2023 |
| Kunde Group Oy | Construction | 1993 |
| Kunnallistekniikka Jussi Väänänen Ky | Construction | 1989 |
| Kunto- ja hoitokeskus Senioriina Ky | Health & social care | 2003 |