| 1158 Marjo Lehtinen Oy | Wholesale & retail | 2014 |
| 5000 m/s -musiikkifestivaali Oy | Arts & recreation | 2025 |
| A-SET Oy | Information & communication | 2020 |
| A-Tasoinfra Oy | Professional & scientific | 2014 |
| A-Transport Oy | Transport & logistics | 2005 |
| A-isännöintipalvelu Oy | Real estate | 2014 |
| A-kodit Oy | Real estate | 2016 |
| A-tilipalvelu Oy | Professional & scientific | 2014 |
| A.P. Welding Tech OY | Manufacturing | 2023 |
| AESTIUM Consulting Oy | Professional & scientific | 2022 |
| AJR-Infra Oy | Real estate | 2019 |
| AJS Tasoite Oy | Construction | 2008 |
| AK monirakennus Oy | Construction | 2012 |
| AMR-Solutions Oy | Professional & scientific | 2016 |
| ARP Motorsport Oy | Arts & recreation | 2008 |
| AT Potilaskuljetus OY | Transport & logistics | 2022 |
| Aalto Medical Oy | Health & social care | 2020 |
| Aarnhelm Oy | Professional & scientific | 2025 |
| Ae.järvinen Oy | Construction | 2026 |
| Aimontappo Maatalous Oy | Agriculture & fishing | 2022 |
| Air Group Oy | Manufacturing | 1999 |
| Airfil Oy | Manufacturing | 2023 |
| Ajoneuvoklinikka Oy | Other services | 2009 |
| Aka Innovation Oy | Professional & scientific | 2023 |
| Akaa Entertainment Oy | Arts & recreation | 2025 |
| Akaa Lines Oy | Transport & logistics | 2010 |
| Akaa Motor Works Oy | Other services | 2026 |
| Akaan Aapeli Oy | Professional & scientific | 2008 |
| Akaan Ajoneuvopalvelu Oy | Other services | 2010 |
| Akaan Apu Oy | Administrative & support | 2025 |
| Akaan Asuntosaneeraus Oy | Construction | 1987 |
| Akaan Auto-Center Oy | Wholesale & retail | 2012 |
| Akaan Autohalli Oy | Other services | 1982 |
| Akaan Automaatio avoin yhtiö | Manufacturing | 1990 |
| Akaan Autotyö Oy | Other services | 2022 |
| Akaan Diesel Oy | Manufacturing | 2013 |
| Akaan Dog Forest Oy | Arts & recreation | 2026 |
| Akaan GRR Oy | Real estate | 2016 |
| Akaan Harjavalmiste Oy | Manufacturing | 1996 |
| Akaan Jalkapalloilun Tuki Oy | Construction | 2016 |
| Akaan Jasa Oy | Other services | 2009 |
| Akaan Katsastuspiste Oy | Professional & scientific | 2023 |
| Akaan Keilahalli Oy | Arts & recreation | 2016 |
| Akaan Kiinteistöhuolto Oy | Administrative & support | 2015 |
| Akaan Kiinteistöpalvelu Oy | Real estate | 2006 |
| Akaan Kuitu ja Kaivin Oy | Construction | 2000 |
| Akaan Laatulasi Oy | Construction | 2014 |
| Akaan Liikennepalvelut Oy | Other services | 2018 |
| Akaan Lukkopalvelu Oy | Wholesale & retail | 2018 |
| Akaan Maanrakennus & Vesijohtosaneeraus oy | Construction | 2010 |
| Akaan Matkailu Oy | Hospitality | 2020 |
| Akaan Muovityö Oy | Manufacturing | 2008 |
| Akaan Muuraus ja Laatoitus Oy | Construction | 1999 |
| Akaan Painosorvaus Oy | Manufacturing | 2011 |
| Akaan Pesupalvelut Oy | Other services | 2013 |
| Akaan Polttopuu Oy | Agriculture & fishing | 2016 |
| Akaan Putki Oy | Construction | 1982 |
| Akaan Rakennusmestaripalvelu Oy | Construction | 2007 |
| Akaan Rakennuspalvelu Oy | Construction | 1991 |
| Akaan Rakennustyö Oy | Construction | 2020 |
| Akaan Remontti Oy | Construction | 2022 |
| Akaan Rengas Oy | Wholesale & retail | 2011 |
| Akaan Siivoustiimi Oy | Administrative & support | 2010 |
| Akaan Silkkipaino Oy | Manufacturing | 1996 |
| Akaan TH-Monirakennus Oy | Construction | 2011 |
| Akaan Taksipalvelu TSP Oy | Transport & logistics | 2014 |
| Akaan Työvälinepalvelu Oy | Manufacturing | 2013 |
| Akaan Varaosa Oy | Wholesale & retail | 2025 |
| Akaan Verhoomo OY | Other services | 2020 |
| Akaan Vuokra-asunnot Oy | Real estate | 1989 |
| Akaan Vuokravarastot Oy | Real estate | 2023 |
| Akaan huolto ja korjaus Oy | Other services | 2022 |
| Akaan peltiurakointi Oy | Construction | 2024 |
| Albus Ecus Oy | Financial services | 1985 |
| Allin Apu Oy | Hospitality | 2019 |
| Alnella Oy | Financial services | 2021 |
| Alpikone Oy | Manufacturing | 1997 |
| Altaica group Oy | Wholesale & retail | 2025 |
| Ammeenmäki Oy | Wholesale & retail | 2012 |
| Anini Oy | Real estate | 2022 |
| Ankeinen Oy | Arts & recreation | 2018 |
| Anki Outlet Oy | Wholesale & retail | 2021 |
| Anna Kärki Ky | Wholesale & retail | 2016 |
| Annu Balance Oy | Professional & scientific | 2025 |
| Antler Bio Oy Ltd | Professional & scientific | 2026 |
| Antsa Oy | Construction | 1985 |
| Aquamoni Oy | Professional & scientific | 2025 |
| Arctic Waters Oy | Manufacturing | 2018 |
| Ari Hiltunen Oy | Financial services | 1963 |
| Arira Oy | Professional & scientific | 1992 |
| Arjen Apuverkko osk | Other services | 2012 |
| Arkkitehtisuunnittelu Mikko Uotila Oy | Professional & scientific | 2010 |
| Arsamet Oy | Manufacturing | 2007 |
| Art Faktory Oy | Arts & recreation | 2023 |
| Artha Oy | Information & communication | 2020 |
| Arvo- ja Notariaattikeskus Oy | Real estate | 2012 |
| Asbwork Oy | Water & waste | 2024 |
| Aseman Kylätalkkari Oy | Administrative & support | 2019 |
| Asennuspalvelu Juha Keskinen Oy | Manufacturing | 2014 |
| Asianajotoimisto Aalto Oy | Professional & scientific | 1980 |