| KRSNA Oy | Professional & scientific | 2006 |
| KS-Team Oy | Construction | 1998 |
| KUU Ruoka Kauppa Oy | Wholesale & retail | 2021 |
| KV Lackvård AB | Other services | 2020 |
| KV Tilausravintolat Oy | Hospitality | 2020 |
| KaJa Kaivuu Oy | Construction | 2021 |
| Kaakkon Saratem Oy | Other services | 2019 |
| Kaarinan Autokiinteistöt Oy | Real estate | 2017 |
| Kaarinan Tekstiilitukku Ky | Wholesale & retail | 1989 |
| Kachila Oy | Professional & scientific | 2022 |
| Kada Media Oy | Information & communication | 2019 |
| Kahani Oy | Professional & scientific | 2023 |
| Kahdeksas Kaupunginosa Oy | Wholesale & retail | 2020 |
| Kahtomi Oy | Construction | 2022 |
| Kahvila Kenkälusikka Oy | Hospitality | 2009 |
| Kahvila Lilan Oy | Hospitality | 2022 |
| Kahvila ja Elintarvikekioski Emma Oy | Hospitality | 2020 |
| Kahvila-Ravintola Anne Ekholm Ky | Hospitality | 1989 |
| Kahvila-ravintola Sääksmäen Silta Oy | Hospitality | 2024 |
| Kahvitupa Ostola Oy | Hospitality | 2023 |
| KaiKal Palvelut Oy | Administrative & support | 2022 |
| Kaidan Oy | Information & communication | 2019 |
| Kaihdinmaailma Oy | Wholesale & retail | 2020 |
| Kaipailevi Oy | Professional & scientific | 2020 |
| Kaivos Ameria Oy | Construction | 2012 |
| Kaiyuan Oy | Hospitality | 2022 |
| Kaj Forsblom Gallery Oy | Wholesale & retail | 2019 |
| Kale Group Oy | Professional & scientific | 2023 |
| Kalkun Myyntipalvelut Oy | Wholesale & retail | 2022 |
| Kalla Group Oy | Construction | 2021 |
| Kallameri Oy | Financial services | 1987 |
| Kallin Hiihtokeskus Oy | Arts & recreation | 2006 |
| Kallio Art & Co Oy | Other services | 2020 |
| Kallion Rakennuspalvelu Oy | Construction | 2025 |
| Kaltar OY | Transport & logistics | 2019 |
| Kamever Rakennus Oy | Construction | 2021 |
| Kamil Tec Oy | Professional & scientific | 2017 |
| Kampin Floxet Oy | Construction | 2013 |
| Kampin Kattohuolto Oy | Administrative & support | 2024 |
| KanPal Oy | Construction | 2016 |
| Kanavaranta 4 Oy | Other services | 2020 |
| Kandela Terapia- ja työyhteisöpalvelut Oy | Health & social care | 2020 |
| Kanervalan Kiinteistöpalvelut Oy | Administrative & support | 2014 |
| Kangasmäen Teollisuus ja Kiinteistö Ky | | 1979 |
| Kangasniemen Varaosa Oy | Wholesale & retail | 1992 |
| Kanijo Oy | Information & communication | 2020 |
| Kankola Capital Oy | Wholesale & retail | 2021 |
| Kanojo International Oy | Wholesale & retail | 1988 |
| Kantakaupungin Rakennus Oy | Administrative & support | 2015 |
| Kapa Ravintolat Oy | Hospitality | 2023 |
| Kapasity Group Oy | Professional & scientific | 2016 |
| Kape Europe Oy | Financial services | 2017 |
| Kapee Oy | Professional & scientific | 2021 |
| Karanvir Oy | Hospitality | 2017 |
| Karelia Arctic Oy | Manufacturing | 2015 |
| Karelia LVI- & Rakennustyö OY | Construction | 2019 |
| Karelians Oy | Hospitality | 2021 |
| Karesfit Property Oy | Real estate | 2016 |
| Karham Cap Oy | Administrative & support | 2025 |
| Karhuseudun Hoivatiimi Oy | Health & social care | 2017 |
| Karis VVS-planering Ab | Professional & scientific | 2002 |
| Karjalan Rakennusmiehet - Karmi Oy | Construction | 2006 |
| Karkkikeiju Oy | Wholesale & retail | 2023 |
| Karm Productions Oy | Arts & recreation | 2022 |
| Karpenter Tampere Oy | Construction | 1988 |
| Karton works Oy | Construction | 2023 |
| Kartoweb Oy | Wholesale & retail | 1992 |
| Kas Pitopalvelu Oy | Hospitality | 2019 |
| Kasa Works Oy | Hospitality | 2022 |
| Kasanen & Aura Digital Management Oy | Professional & scientific | 2019 |
| Kasha Oy | Hospitality | 2025 |
| Kaskuljetus Oy | Transport & logistics | 2024 |
| Kasslerkeidas Oy | Other services | 2020 |
| Kastellin Zara Oy | Hospitality | 2022 |
| Kasvunsilta Oy | Health & social care | 2022 |
| Kasvuverso Oy | Professional & scientific | 2023 |
| Katajanokan Preset Oy | Information & communication | 2012 |
| Katriinan Hoivapalvelut Oy | Health & social care | 2021 |
| Katto Paroni Group Oy | Construction | 2022 |
| KauneudenGuru Viljanmaa Oy | Professional & scientific | 2022 |
| Kauneussalonki Niaz Oy | Other services | 2016 |
| Kauniala Oy | Hospitality | 1998 |
| Kauppa Sauma Oy | Wholesale & retail | 2016 |
| Kauppahuone Borg&Ström Oy | Wholesale & retail | 2020 |
| Kauppahuone Virtanen Oy | Wholesale & retail | 1974 |
| Kauppalanpuiston Trans Oy | Transport & logistics | 1984 |
| Kavipi Oy | Professional & scientific | 2023 |
| Kehityksen Talo Oy | Real estate | 1991 |
| Kehä Rakennus Oy | Construction | 2020 |
| Kehätekniikka Oy | Construction | 2022 |
| Keiot Oy | Professional & scientific | 2023 |
| Keitele Productions Oy | Information & communication | 2022 |
| Kekasti Oy | Administrative & support | 2015 |
| Kelloholvi Oy | Wholesale & retail | 2019 |
| Kelujärven Vesihuolto Osakeyhtiö | Water & waste | 1979 |
| Keme Industries AB | Professional & scientific | 2013 |
| Kempeleen Taksipalvelu Oy | Transport & logistics | 2019 |
| Kerhon tupa ky | Hospitality | 2002 |
| KerjäläisJätkä Oy | Professional & scientific | 2023 |
| Kerryman Oy | Construction | 2020 |