| Kaamos Hope Oy | Real estate | 2026 |
| Kaamos Leatherwork Oy | Wholesale & retail | 2026 |
| Kaamos Properties Oy | Real estate | 2023 |
| Kaaos Projects Osk | Administrative & support | 2023 |
| Kaapelimestari Oy | Construction | 2023 |
| Kaarina Niemi Oy | Professional & scientific | 1984 |
| Kaarituote Oy | Wholesale & retail | 2003 |
| Kaarne Communication Oy | Professional & scientific | 2011 |
| Kaava & Co Oy | Wholesale & retail | 2020 |
| Kabanov tanssitehdas avoin yhtiö | Arts & recreation | 1998 |
| Kabul Market Oy | Wholesale & retail | 2025 |
| Kaeken Keskellä Oy | Professional & scientific | 2026 |
| Kahvila Aniitta Oy | Hospitality | 1998 |
| Kahvila Ardentte Oy | Hospitality | 2025 |
| Kahvila Laukontorinkulma Kulonen & Kulonen Ky | Hospitality | 1981 |
| Kahvilaravintola Tömäri Kommandiittiyhtiö | Hospitality | 1987 |
| Kaigen Oy | Information & communication | 2025 |
| Kaihdin Pukkila Oy | Wholesale & retail | 2004 |
| KaihdinYkkönen Oy | Wholesale & retail | 2024 |
| Kaihola Sound Ky | Arts & recreation | 2012 |
| Kaihtiva Oy | Wholesale & retail | 2025 |
| Kaikki meni Oy | Financial services | 2023 |
| Kaiku Henkilöstöpalvelut Tampere Oy | Administrative & support | 2014 |
| Kailind Oy | Hospitality | 1999 |
| Kainsto Oy | Professional & scientific | 1989 |
| Kaipola Green Port Oy | Real estate | 2021 |
| Kaira Clan Oy | Professional & scientific | 2019 |
| Kairimo Consulting Oy | Construction | 2018 |
| Kairos Time Oy | Financial services | 2021 |
| Kaisa Ruuttila Golf Oy | Wholesale & retail | 1995 |
| Kaisan Kiille Oy | Health & social care | 2022 |
| Kaisec Consulting 0y | Professional & scientific | 2007 |
| Kaiserstuhl Oy | Information & communication | 2015 |
| KaitalaGroup Oy | Administrative & support | 2023 |
| Kaivannon Vesiosuuskunta | Water & waste | 2008 |
| Kaivinyhtymä M Palonen Oy | Construction | 1981 |
| Kaivonporaus Pajunoja Oy | Construction | 2000 |
| Kajasta Oy | Professional & scientific | 2022 |
| Kajawa Oy | Professional & scientific | 1996 |
| Kajones barber Oy | Other services | 2024 |
| Kajora Oy | Health & social care | 2018 |
| Kajot Oy | Professional & scientific | 2024 |
| Kakshoo Oy | Information & communication | 2024 |
| Kaksi Kitaraa Soitinkauppa Oy | Wholesale & retail | 2021 |
| Kaksoisvirhe Oy | Hospitality | 2017 |
| Kalaherkut Oy Nygren | Wholesale & retail | 1991 |
| Kalakokit Tampere Oy | Hospitality | 2017 |
| Kalakuninkaat Oy | Wholesale & retail | 2018 |
| Kalaravintola Kalax Oy | Hospitality | 2013 |
| Kale Pizza Kebab avoin yhtiö | Hospitality | 2010 |
| Kalenteriin.fi Oy | Professional & scientific | 2015 |
| Kaleva Brewing Company Oy | Manufacturing | 2016 |
| Kaleva Growth Partners Oy | Administrative & support | 2023 |
| Kalevan Autokoulu Oy | Education | 1961 |
| Kalevan Isännöinti Oy | Real estate | 1989 |
| Kalevan Kello H & J Pietarila | Wholesale & retail | 1977 |
| Kalevan Kiinteistötarkkailupalvelu Oy | Professional & scientific | 2021 |
| Kalevan Kopio-Team Oy | Financial services | 1994 |
| Kalevan Kukkatukku Oy | Wholesale & retail | 1976 |
| Kalevan Pesula Oy | Other services | 2015 |
| Kalevan Pizzeria Oy | Hospitality | 2024 |
| Kalevan Sijoitus Oy | Real estate | 2017 |
| Kalevan Sähkö Oy | Construction | 1954 |
| Kalevan Talonmiespalvelu Oy | Administrative & support | 2007 |
| Kalevan muutto ja kuljetus ky | Transport & logistics | 2010 |
| Kalevi Capital Oy | Financial services | 2022 |
| Kalkun Kaivin Oy | Construction | 1982 |
| Kalkun Pupnikit avoin yhtiö | Hospitality | 2011 |
| Kalle Jokinen Racing Ky | Arts & recreation | 1993 |
| Kallioinen LVI Ky | Manufacturing | 1985 |
| Kalma Games Oy | Information & communication | 2024 |
| Kalmar Finland Oy | Manufacturing | 1994 |
| Kalog Oy | Professional & scientific | 2024 |
| Kaltsubar Oy | Hospitality | 2019 |
| Kalustekundit Oy | Financial services | 2019 |
| Kalustemaakarit Oy | Construction | 2020 |
| Kamana Oy | Real estate | 2007 |
| Kameratori Oy | Wholesale & retail | 2010 |
| Kami Martial Arts Oy | Education | 2025 |
| Kampaamo-parturi Top-Tukka JP Ky | Other services | 1983 |
| Kampaamokauppa Desila Oy | Other services | 2025 |
| Kampin Sirkus Oy | Hospitality | 2009 |
| Kampustuote Oy | Manufacturing | 1990 |
| Kamstet Oy | Professional & scientific | 2026 |
| Kamu Digital Oy | Professional & scientific | 2023 |
| Kan & Kewalin Oy | Wholesale & retail | 2016 |
| Kana veljet oy | Hospitality | 2015 |
| Kanava Tietopalvelut oy | Information & communication | 2014 |
| Kaneli & Kaulin Oy | Manufacturing | 2018 |
| Kanervo Cars avoin yhtiö | Wholesale & retail | 2021 |
| Kangasalan Automaattivarastot Oy | Real estate | 2022 |
| Kangasalan Puutarhataimi Ky | Agriculture & fishing | 1989 |
| Kangasalan ajoneuvopesu Oy | Other services | 2018 |
| Kanniston Autolasipalvelu Oy | Other services | 2001 |
| Kantasijoitus Oy | Financial services | 1989 |
| KantoF Group oy | Wholesale & retail | 2026 |
| Kantokolmio Oy | Administrative & support | 2000 |
| Kantrirakenne Oy | Construction | 2011 |
| Kanttiauto Oy | Transport & logistics | 1998 |
| Kape Media Oy | Professional & scientific | 2022 |