| Kero Nordic Oy | Manufacturing | 2020 |
| Keronis Technologies Oy | Information & communication | 2021 |
| Kerrosneliö Oy | Construction | 2022 |
| Kertekki Oy | Professional & scientific | 2017 |
| Kertoma Oy | Health & social care | 2019 |
| Kerttukodit Oy | Construction | 2024 |
| Kertymä Oy | Financial services | 2026 |
| Kesar Oy | Construction | 2020 |
| Keski-Espoon Tili ja lsännöinti Oy | Real estate | 2018 |
| Keskinäinen Osakeyhtiö Soleil du Sud Ltd | Real estate | 1988 |
| Keskinäinen Työeläkevakuutusyhtiö Elo | Public administration | 1971 |
| Keskustan Maalaus ja Rakennus Oy | Construction | 1981 |
| Kestilä Group Oy | Information & communication | 2015 |
| Kestomenestyjä Oy | Financial services | 2023 |
| Kestorakennus Oy | Construction | 2007 |
| Kesäranta Finance Oy | Real estate | 2022 |
| Ketju Asunnot Uusimaa Oy | Real estate | 2023 |
| Ketola - Tuotanto Oy | Wholesale & retail | 2004 |
| Ketola Medical Oy | Health & social care | 2011 |
| Kettulan Päiväkoti Oy | Education | 2007 |
| Kettulan Päiväkoti Ulvila Oy | Education | 2011 |
| Ketunkullan Hyvinvointi Oy | Other services | 2021 |
| Keuko Oy | Professional & scientific | 2026 |
| Kevee Gear Oy | Manufacturing | 2022 |
| Kevin International Oy | Education | 2002 |
| Kevyt Leija Oy | Financial services | 2017 |
| Kevätpelto Oy | Professional & scientific | 2021 |
| Kexi Oy | Professional & scientific | 2022 |
| Key Skills Oy | Education | 2021 |
| KeyBow Oy | Professional & scientific | 2024 |
| KeyPulse Oy | Information & communication | 2023 |
| KeySolutions Oy | Information & communication | 2007 |
| KeyStaff Oy | Administrative & support | 2023 |
| Keynotes Oy | Professional & scientific | 2009 |
| Keyresource Oy | Information & communication | 1990 |
| KezTranslate Oy | Professional & scientific | 2021 |
| Khimoo Oy | Information & communication | 2010 |
| Khipu Tech Oy | Information & communication | 2025 |
| Khunchai Oy | Other services | 2011 |
| Ki-Sal Oy | Wholesale & retail | 1994 |
| KiSu Holding Oy | Financial services | 2022 |
| KiWi Consulting Oy | Professional & scientific | 2018 |
| Kiala Capital Oy | Real estate | 2025 |
| Kiani Oy | Information & communication | 2021 |
| Kianka Oy | Professional & scientific | 2004 |
| Kick Motion RT Oy | Information & communication | 2022 |
| Kick Serve Oy | Professional & scientific | 2017 |
| KiddiFeet Oy | Wholesale & retail | 2016 |
| Kiddoulife Oy | Health & social care | 2023 |
| Kide Code Oy | Information & communication | 2018 |
| Kide Ventures Oy | Information & communication | 2026 |
| Kidesiivous Oy | Administrative & support | 2014 |
| Kids Friendly Media Oy | Administrative & support | 2013 |
| Kiefer Oy | Professional & scientific | 2013 |
| Kiehtäjä Oy | Real estate | 1978 |
| Kiehu Music Oy | Arts & recreation | 2016 |
| Kiekko-Espoo Oy | Arts & recreation | 2018 |
| Kiekko-Espoon Kannattajat Oy | Financial services | 2026 |
| Kiela Partners Oy | Professional & scientific | 2017 |
| Kieli Experts Oy | Information & communication | 2020 |
| Kielikoto Oy | Education | 2013 |
| Kielikoulu Masto oy | Education | 2022 |
| Kiertonen Consulting Oy | Professional & scientific | 2011 |
| Kierukka Invest Oy | Financial services | 2026 |
| Kierukka Oy | Health & social care | 2015 |
| Kihelmä Oy | Professional & scientific | 2014 |
| Kii.exe Consulting Oy | Professional & scientific | 2022 |
| Kiianlinna Oy | Real estate | 1981 |
| Kiihdytyskaista Oy | Professional & scientific | 2022 |
| Kiiltosiivous Oy | Administrative & support | 2022 |
| Kiint. Oy Onninmaja | Real estate | 1992 |
| Kiinteistö Collin Oy | Real estate | 1989 |
| Kiinteistö F Nyman Oy | Real estate | 2000 |
| Kiinteistö Läkkisepäntie 12 Oy | Real estate | 2004 |
| Kiinteistö Midas Group Ltd Oy | Real estate | 1991 |
| Kiinteistö Oy Ankkurisaarentie 29 | Arts & recreation | 1990 |
| Kiinteistö Oy Antti Ruusunlehti | Real estate | 2016 |
| Kiinteistö Oy AurinkoSuomu | Real estate | 2009 |
| Kiinteistö Oy Avaranda | Real estate | 2017 |
| Kiinteistö Oy Bastuholmenin Joutsen | Real estate | 1988 |
| Kiinteistö Oy Berthas | Real estate | 1986 |
| Kiinteistö Oy Bikenmäki | Real estate | 2012 |
| Kiinteistö Oy Brännberget | Real estate | 1992 |
| Kiinteistö Oy ET-Hoiva-asunnot I | Real estate | 2013 |
| Kiinteistö Oy Espoon Haltiankaari | Real estate | 1997 |
| Kiinteistö Oy Espoon Hehkurinne 2A | Real estate | 2023 |
| Kiinteistö Oy Espoon Hehkurinne 2C | Real estate | 2023 |
| Kiinteistö Oy Espoon Juunlehto | Real estate | 2000 |
| Kiinteistö Oy Espoon Juunniitty | Real estate | 2000 |
| Kiinteistö Oy Espoon Juvan teollisuushalli | Real estate | 2010 |
| Kiinteistö Oy Espoon Kilonkuja 4 | Real estate | 2012 |
| Kiinteistö Oy Espoon Kurjenkellontie 5 | Real estate | 2006 |
| Kiinteistö Oy Espoon Kurutie 14 | Real estate | 2002 |
| Kiinteistö Oy Espoon Kynäkatu A | Real estate | 2011 |
| Kiinteistö Oy Espoon Kynäkatu B | Real estate | 2011 |
| Kiinteistö Oy Espoon Matinrinne | Real estate | 2019 |
| Kiinteistö Oy Espoon Miestentie 2 C-D | Real estate | 2023 |
| Kiinteistö Oy Espoon Mikkelänkallio 18 | Real estate | 2001 |
| Kiinteistö Oy Espoon Niittyportin pysäköinti | Transport & logistics | 2023 |
| Kiinteistö Oy Espoon Nummitie 32 | Real estate | 1995 |