| KOKO Nordic Oy | Health & social care | 2020 |
| KOKO Tapahtuma OSK | Arts & recreation | 2019 |
| Koko-Ai OY | Information & communication | 2025 |
| KOKORO Oy | Hospitality | 2016 |
| KOLM3 Oy | Manufacturing | 2018 |
| KOLU Arkkitehdit Oy | Professional & scientific | 2022 |
| KOM-Ravintola Oy | Hospitality | 1996 |
| KOMP Consulting Oy | Professional & scientific | 2022 |
| KONE Hissit Oy | Construction | 2004 |
| KONE Oyj | Manufacturing | 2005 |
| Konufi OY | Construction | 2015 |
| KOO Kuivaus Oy | Construction | 2024 |
| Koon Design OY | Professional & scientific | 2006 |
| KOP Consulting Oy | Professional & scientific | 2022 |
| Koptercamera Finland OY | Professional & scientific | 2012 |
| KOR-Konsultointi Oy | Information & communication | 1990 |
| Korean Grazy Chicken OY | Hospitality | 2025 |
| KORNELIA FI Oy | Construction | 2024 |
| Korpium OY | Arts & recreation | 2025 |
| KOTA MUSIC Oy | Information & communication | 2025 |
| Koti Konsultointi Ja Saneeraus OY | Construction | 2024 |
| Kotiketju LKV OY | Real estate | 2019 |
| Kotipalvelu U-M Kangas Ky | Administrative & support | 2006 |
| Kotivasara OY | Administrative & support | 2011 |
| Kottarainen Cottages OY | Hospitality | 2009 |
| Kottonen Yhtiöt OY | Transport & logistics | 2021 |
| Kovako OY | Construction | 2010 |
| KOVAMENO osk | Arts & recreation | 2023 |
| KOY Akkutie 10 | Real estate | 2018 |
| KOY Espoon Anna Sahlsténin katu 16 | Real estate | 2016 |
| KOY Helsingin Halmetie 21 | Real estate | 2018 |
| KOY Helsingin Kehruutie 8 | Real estate | 2016 |
| KOY Helsingin Kivikonlaita 36 | Real estate | 2019 |
| KOY Järvenpään Myllytie 14 | Real estate | 2022 |
| KOY Kantatila Kusas | Real estate | 2018 |
| KOY Kirkkonummen Kiilatie 15 | Real estate | 2018 |
| KOY SoppeeHill Bridge | Real estate | 2021 |
| KOY Tuusulan Kauppaholvi | Real estate | 2020 |
| KOY VaPot | Real estate | 1980 |
| KOY Villa Maya | Hospitality | 2026 |
| KOY Väinämöisen kenttä | Arts & recreation | 2013 |
| KOY Willa Strand | Real estate | 2025 |
| KOy Camp Elias | Real estate | 2026 |
| KOy Helsingin Mäkelänkadun Koti | Real estate | 2016 |
| KOy Jussarön majakkapoukama | Real estate | 2015 |
| KOy Järvenpään Pajalan Mylly | Real estate | 2013 |
| KOy Kivenlahden keskuskortteli pysäköinti | Transport & logistics | 2023 |
| KOy Koirasaaren Palvelut | Real estate | 2025 |
| KOy Kuopio 39 | Real estate | 2018 |
| KOy Maki 3 | Real estate | 2018 |
| KOy Nokian Rounionkatu 1 | Real estate | 2010 |
| KOy Oulun Vesuritie 8 | Real estate | 2015 |
| KOy T2 Partners Vaasa FAb | Real estate | 2021 |
| KOy Turun Pääskyvuorenlaakso C | Real estate | 2018 |
| KOy Tuusulan Mylläri | Real estate | 2024 |
| KOy Uutela Vuokraus | Real estate | 2019 |
| KOy Villa Violante | Real estate | 2012 |
| KP Burger Oy | Hospitality | 2013 |
| KP Cirque Production oy | Arts & recreation | 2016 |
| KP Crew Oy | Wholesale & retail | 2010 |
| KP Health and Wellness services oy | Arts & recreation | 2025 |
| KP Herttoniemi Oy | Hospitality | 2022 |
| KP IPR Holding Oy | Administrative & support | 2021 |
| KP Laatucontrol Oy | Administrative & support | 2007 |
| KP Roba Oy | Hospitality | 2013 |
| KP Shop Oy | Wholesale & retail | 2025 |
| KP Talorakennus Oy | Construction | 2019 |
| KP Teollisuuspalvelu Oy | Wholesale & retail | 2008 |
| KP-Consulting Oy | Wholesale & retail | 2005 |
| KP-Ideat Oy | Arts & recreation | 1985 |
| KP-Rakennus ja Remontti Oy | Construction | 2014 |
| KP-art Oy | Professional & scientific | 1978 |
| KPA Unicon Group Oy | Professional & scientific | 2010 |
| KPA Unicon Infra Oy | Financial services | 2018 |
| KPA Unicon Oy | Professional & scientific | 2008 |
| KPCC Services Oy | Administrative & support | 2024 |
| KPH Experts Oy | Construction | 2022 |
| KPH Invest Oy | Financial services | 2014 |
| KPI Optimization and Strategic Taxation Operations Services Oy Ltd | Professional & scientific | 2012 |
| KPK-Teräpalvelu Ky | Manufacturing | 2008 |
| KPMG Global Strategy Group Finland Oy Ab | Professional & scientific | 2011 |
| KPMG IT Sertifiointi Oy | Professional & scientific | 2012 |
| KPMG Julkistarkastus Oy | Professional & scientific | 1996 |
| KPMG Oy Ab | Professional & scientific | 2003 |
| KPPT Drones Oy | Manufacturing | 2025 |
| KPT Capital Oy | Financial services | 2026 |
| KQ Holding Oy | Financial services | 2021 |
| KR Teräs Oy | Manufacturing | 2021 |
| KR Travel Solutions Oy | Administrative & support | 2025 |
| KR-Muhviputki Oy | Construction | 2007 |
| KR-Palvelut Oy | Health & social care | 2003 |
| KREAM Helsinki Osk | Professional & scientific | 2016 |
| KREI Renewables Oy | Financial services | 2023 |
| KRG-Kuljetus Oy | Transport & logistics | 1997 |
| KRGR Consulting and Capital Oy | Professional & scientific | 2024 |
| KRH Rakennus Oy | Construction | 1987 |
| KRK Ahjo Oy | Professional & scientific | 2001 |
| KRK-Kuljetus Oy | Transport & logistics | 1997 |
| KRNR Consulting Oy | Professional & scientific | 2016 |
| KRNR Holdings Oy | Professional & scientific | 2019 |