| Kalustokeskus Oy Kake 4 | Administrative & support | 2008 |
| Kamun Pulju Oy | Hospitality | 2016 |
| KaneSport Oy | Administrative & support | 2008 |
| KanerVillaVuokratyö oy | Administrative & support | 2024 |
| Kanniston Huolto Oy | Real estate | 1969 |
| Kanniston Liikekiinteistö Oy | Professional & scientific | 1975 |
| Kannistonkulma Oy | Wholesale & retail | 2002 |
| Kantamus Oy | Wholesale & retail | 2025 |
| Kapo Trans Oy | Transport & logistics | 2024 |
| Karelia Smiley Oy | Information & communication | 2020 |
| Karhu Laitesähkö Oy | Construction | 2008 |
| Kari Block Ky | Manufacturing | 1980 |
| Karinin Siivous Oy | Administrative & support | 2011 |
| Karla Works Oy | Administrative & support | 2023 |
| Karoliina Kirsikka Oy | Manufacturing | 2025 |
| Kasali Oy | Professional & scientific | 2019 |
| Kaskela Group Oy | Construction | 1990 |
| Kastilian Hallitus Oy | Wholesale & retail | 2011 |
| Kate-Konsultit Oy | Professional & scientific | 1989 |
| Katja Saario Oy | Wholesale & retail | 2022 |
| Kauhakorpi Oy | Real estate | 1990 |
| Kauko A. Mäkinen Ky | Wholesale & retail | 1974 |
| Kauneus- ja Terveyshoitola KatMarine Oy | Other services | 2007 |
| Kauneushoitola Namu Oy | Other services | 2013 |
| Kauneuskaluste Oy | Administrative & support | 2012 |
| Kauneuskeidas Mirva Oy | Other services | 1991 |
| Kauneuspartnerit - Beautypartners Oy/Ltd. | Wholesale & retail | 2012 |
| Kauneuspiste Pioni Oy | Other services | 2012 |
| Kauppa-Sarekka Oy | Transport & logistics | 1996 |
| Kava Oy | Manufacturing | 2023 |
| Kavas Oy | Professional & scientific | 2021 |
| Kavun Oy | Hospitality | 2023 |
| Kaxte Oy | Construction | 2021 |
| Keittiöasennus P&T Oy | Construction | 2021 |
| Kellotrans Oy | Transport & logistics | 1999 |
| Kemppainen Consulting Oy | Professional & scientific | 2022 |
| Kentonec Group Oy | Professional & scientific | 2012 |
| Kentonec Oy | Wholesale & retail | 1998 |
| Kera Palvelut Oy | Administrative & support | 2020 |
| Keraneon Oy | Construction | 1995 |
| Kerava Areena Oy | Arts & recreation | 2008 |
| Kerava-Sipoo Liikuntahallit Oy | Arts & recreation | 2022 |
| Keravan Aseman lounas-kahvila Oy | Hospitality | 2022 |
| Keravan Asentajat Oy | Real estate | 1983 |
| Keravan Autohuolto Oy | Other services | 2009 |
| Keravan Autokoulu Oy | Education | 1986 |
| Keravan Autosähkö Oy | Other services | 1988 |
| Keravan Energia Oy | Energy | 1992 |
| Keravan Energia Sähköverkko Oy | Energy | 2025 |
| Keravan Hammaslääkärikeskus Oy | Real estate | 1990 |
| Keravan Huoltopalvelu Oy | Administrative & support | 1982 |
| Keravan Isännöinti Oy | Real estate | 1991 |
| Keravan Kiinteistöpalvelu Oy | Real estate | 1989 |
| Keravan Koirahoitola Ainoa Oy | Other services | 2024 |
| Keravan Kruunun Oy | Wholesale & retail | 2024 |
| Keravan Liikennekoulu Oy | Education | 1996 |
| Keravan Lukko Holding Oy | Professional & scientific | 2025 |
| Keravan Lukko Oy | Wholesale & retail | 2006 |
| Keravan Lämpövoima Oy | Energy | 2006 |
| Keravan Lääkintävoimistelu Oy | Health & social care | 1983 |
| Keravan Löytö Oy | Wholesale & retail | 2025 |
| Keravan Muovi ja Lelu Oy | Wholesale & retail | 1992 |
| Keravan Pizza Napoli Avoin yhtiö | Hospitality | 2012 |
| Keravan Puheterapia Oy | Health & social care | 2014 |
| Keravan Raivaus Oy | Construction | 2007 |
| Keravan Ratsastuskoulu Oy | Arts & recreation | 1995 |
| Keravan Rengas Oy | Wholesale & retail | 1995 |
| Keravan Saneerauspalvelu Oy | Construction | 2007 |
| Keravan Selkäpiste Oy | Other services | 2005 |
| Keravan Siivous & Huoltopalvelu Oy | Administrative & support | 2011 |
| Keravan Silmäkulma Oy | Wholesale & retail | 1981 |
| Keravan Sähkö Oy | Construction | 2019 |
| Keravan Sähköapu Ky | Administrative & support | 2005 |
| Keravan Taksi Oy | Transport & logistics | 1993 |
| Keravan Tenniskeskus Oy | Arts & recreation | 1985 |
| Keravan Teräsmiehet Oy | Manufacturing | 2013 |
| Keravan Terästie 26 Oy | Real estate | 1967 |
| Keravan Tiikeri HC Oy | Financial services | 2020 |
| Keravan Tilipalvelu Oy | Professional & scientific | 1985 |
| Keravan Tornipysäköinti Oy | Real estate | 1990 |
| Keravan Videopojat Oy | Information & communication | 1991 |
| Keravan autofix oy | Other services | 2021 |
| Keravan autokorjaamo Oy | Other services | 2008 |
| Keravan hammaslääkäriasema Oy | Health & social care | 1975 |
| Keravan talonmiestiimi Oy | Administrative & support | 1999 |
| Kerawatti Oy | Construction | 2017 |
| Kerko Group Oy | Wholesale & retail | 2007 |
| Kermark Oy | Construction | 1992 |
| Kermetar Oy | Wholesale & retail | 1980 |
| Kermit Oy | Construction | 2020 |
| Kerralla kylmäksi Oy | Construction | 2025 |
| Kersal Oy | Other services | 2021 |
| Keski-Uudenmaan Brandi Oy | Information & communication | 2020 |
| Keski-Uudenmaan Elektroniikka Oy | Wholesale & retail | 1993 |
| Keski-Uudenmaan Eläinlääkäriasema Oy | Professional & scientific | 1990 |
| Keski-Uudenmaan Hammasteknikkopalvelu Oy | Manufacturing | 1989 |
| Keski-Uudenmaan Kehittämiskeskus Oy Keuke | Education | 1998 |
| Keski-Uudenmaan Monitoimi Oy | Construction | 2020 |
| Keski-Uudenmaan Talopalvelut Oy | Administrative & support | 2006 |
| Kesta oy | Wholesale & retail | 2023 |