| Kuljetusliike Arto Cederlöf Oy | Transport & logistics | 2022 |
| Kuljetusliike Christer Forsberg Oy | Transport & logistics | 1998 |
| Kuljetusliike Jokela & Jokela Ky | Transport & logistics | 1984 |
| Kuljetusliike Jorma Hämäläinen Kommandiittiyhtiö | Transport & logistics | 1977 |
| Kuljetusliike Korpikoski Oy | Transport & logistics | 2023 |
| Kuljetusliike Marko Meriläinen Oy | Transport & logistics | 2018 |
| Kuljetuspalvelu Hissa Ay | Transport & logistics | 2026 |
| Kultahippunen Oy | Professional & scientific | 2023 |
| Kultak Oy | Real estate | 2022 |
| Kuninkaan Herkku Oy | Manufacturing | 2020 |
| Kunitek Oy | Construction | 2010 |
| Kuori Consulting Oy | Professional & scientific | 2020 |
| Kurirens Förlag Ab | Information & communication | 1972 |
| Kurirens Resebyrå, kommanditbolag, Frejvid Weegar | Administrative & support | 1972 |
| Kurtenia Hammaslääkärit Oy | Health & social care | 2010 |
| Kustmedia Ab Oy | Information & communication | 1986 |
| KuvaSeppälä-yhtiöt Oy | Professional & scientific | 1978 |
| Kvadraten Ab | Construction | 2007 |
| Kvadraten Service Ab | Real estate | 2018 |
| Kvarken Eagle Oy | Professional & scientific | 2018 |
| Kvarken Link Oy | Transport & logistics | 2019 |
| Kvarnbacken Vind Ab | Energy | 2022 |
| Kvevlax torken Öppet bolag | Agriculture & fishing | 2007 |
| Ky C. Hudd Kb | Transport & logistics | 2019 |
| Ky Finnrow Kb | Manufacturing | 1986 |
| Ky Fysio Dens Kb | Health & social care | 1995 |
| Ky Hydrofix Kb | Administrative & support | 1991 |
| Ky Hydroplan Kb | | 1981 |
| Ky J-P Myllykangas Kb | Wholesale & retail | 1988 |
| Ky Le Chef Kb | Hospitality | 1985 |
| Ky LefaFix Kb | Construction | 2011 |
| Ky Maarakennus Kronman Jordbyggnad Kb | Construction | 2015 |
| Ky Mainospaja Ritva Ingberg Kb | Professional & scientific | 1989 |
| Ky Paper Invest & House and Car | Wholesale & retail | 1987 |
| Ky Qualite Beaute Q & B Kb | Wholesale & retail | 1984 |
| Ky T-L Sjöberg Center Kb | Wholesale & retail | 1991 |
| Ky Test Music Kb | Information & communication | 1990 |
| Ky Traccer Music Kb | Information & communication | 1991 |
| Ky Vaastools Kb | | 1984 |
| Kyltek Oy Ab | Construction | 2025 |
| Kyrönmaan Autohuolto Avoinyhtiö | Other services | 2008 |
| Kyrönmaan Laskenta ky | Professional & scientific | 1982 |
| Källarsalongen Milou Ab | Other services | 2001 |
| L Oikkonen Oy | Hospitality | 2023 |
| L. Salkari Oy | Wholesale & retail | 1948 |
| L8 Group Oy | Financial services | 2018 |
| LAA Nova Ab | Financial services | 2026 |
| LAiW Ab | Professional & scientific | 2025 |
| LEMO Connector Finland Oy | Wholesale & retail | 2023 |
| LG Dent Ab | Health & social care | 2024 |
| LHL Vaasa Oy Ab | Health & social care | 2019 |
| LI'Z avoin yhtiö | Wholesale & retail | 2024 |
| LIScomp Oy | Health & social care | 2009 |
| LKN Asunnot Oy | Real estate | 2025 |
| LKT Lava ja Kone Tekniikka Ky | Manufacturing | 1992 |
| LKV Muhonen AFM Oy Ab | Real estate | 2017 |
| LL & Co Oy | Professional & scientific | 2026 |
| LL Aesthetics Oy | Health & social care | 2024 |
| LMH Company Oy Ab | Wholesale & retail | 2021 |
| LRC Plus Oy | Construction | 2023 |
| LRC-Holding Oy | Real estate | 1996 |
| LSTR Group Oy | Professional & scientific | 2025 |
| LT-sijoitus Oy | Financial services | 2014 |
| LTK Holding Ab Oy | Professional & scientific | 2022 |
| LTR Kiinteistöt Oy | Real estate | 2019 |
| LVI-Palvelut Ensio Heinonen Oy | Professional & scientific | 2009 |
| LVI-Sähkö Oinonen Ky | Construction | 1963 |
| LVI-Tekniikka Vaasa Oy | Construction | 2002 |
| LWRD Designs Oy | Manufacturing | 2021 |
| La GuacaMaya avoin yhtiö | Hospitality | 2014 |
| La Vigna Ravintola Oy | Hospitality | 2023 |
| Laakso Minerals Oy | Mining & quarrying | 2018 |
| Laanna Thai Restaurant Oy Ab | Hospitality | 2019 |
| LaatuTek Oy | Real estate | 2019 |
| Laatusisustus IRA Oy | Administrative & support | 2017 |
| Laatutuote Oy | Wholesale & retail | 1931 |
| Label 4 Ab Oy | Other services | 2014 |
| Lady Fit Oy | Arts & recreation | 2010 |
| Lahjatehdas Oy | Manufacturing | 2018 |
| Laine Kiinteistösijoitus Oy | Real estate | 2014 |
| Laine-Kiinteistöt, Vaasa I Oy | Real estate | 2014 |
| Laine-Kiinteistöt, Vaasa II Oy | Real estate | 2014 |
| Laitehuolto Timo Rossi Oy | Manufacturing | 1995 |
| Lakeuden Kiinteistökehitys Oy | Real estate | 2021 |
| Lakiasiaintoimisto Juridisk byrå Oy Mika Paloheimo Ab | Professional & scientific | 1995 |
| Lakiasiaintoimisto Lind Juridisk byrå Oy Ab | Professional & scientific | 2025 |
| Lakiasiaintoimisto Lunalex Oy | Professional & scientific | 2025 |
| Lakitoimisto Leo's Peace Oy | Professional & scientific | 2024 |
| LankaTaika Oy | Wholesale & retail | 2024 |
| Lars Mosander Kb | Education | 2019 |
| LaserEdu Oy | Education | 2015 |
| Laskentatalo Oy | Information & communication | 2025 |
| LassTec Ab | Professional & scientific | 2025 |
| Lateco-Botim Oy | Wholesale & retail | 1985 |
| Laten Taxit Oy | Transport & logistics | 1989 |
| Latvala Invest Oy | Real estate | 2025 |
| Le Loi 19 Ab | Real estate | 2025 |
| Leadec Leadership Development Center Oy | Professional & scientific | 1997 |
| Ledger Proma Oy | Real estate | 2014 |
| Lehtodent Oy | Manufacturing | 2020 |