| Amiteh Oy | Construction | 2011 |
| Ammatillinen Perhekoti Villa SoMa Oy | Health & social care | 2023 |
| Ammatillinen Perhekoti Wanhavaara Oy | Health & social care | 2005 |
| Anja Suomi Oy | Administrative & support | 2024 |
| Annastiina Pakanen Oy | Administrative & support | 2024 |
| Annelin Yrtit & Karkit Oy | Manufacturing | 2013 |
| Anran Oy | Hospitality | 2021 |
| Ansapoo Oy | Hospitality | 2015 |
| Anttila Assets Oy | Administrative & support | 2024 |
| Anttisworld Oy | Information & communication | 2007 |
| ApuHepe Oy | Construction | 2015 |
| ApuLappi Oy | Manufacturing | 2009 |
| Apupata Oy | Hospitality | 2021 |
| Arcovita Ky | Health & social care | 2006 |
| Arcphy Oy | Health & social care | 2024 |
| Arctic Adventures Lapland Oy | Administrative & support | 2023 |
| Arctic Alma Oy | Administrative & support | 2026 |
| Arctic Arches Oy | Hospitality | 2025 |
| Arctic Art Care Oy | Health & social care | 2013 |
| Arctic Attitude Oy | Other services | 2024 |
| Arctic Aurora Experience Oy | Administrative & support | 2025 |
| Arctic Aurora Group Oy | Real estate | 2024 |
| Arctic Aurora House OY | Administrative & support | 2024 |
| Arctic Automation Oy | Professional & scientific | 2024 |
| Arctic Bear Resort Oy | Hospitality | 2025 |
| Arctic Bike Oy | Wholesale & retail | 2020 |
| Arctic Blaze Oy | Arts & recreation | 2018 |
| Arctic Boss Ltd Oy | Administrative & support | 2024 |
| Arctic Boutique Collection Oy | Professional & scientific | 2025 |
| Arctic Career Oy | Administrative & support | 2022 |
| Arctic Cherry Events Oy | Arts & recreation | 2023 |
| Arctic Circle Aurora Tours Oy | Administrative & support | 2024 |
| Arctic Circle Holiday Homes Oy | Real estate | 2004 |
| Arctic Circle Kustoms Oy | Wholesale & retail | 2019 |
| Arctic Circle Minimarket Oy | Wholesale & retail | 2024 |
| Arctic Circle Toy Industries Oy | Manufacturing | 2018 |
| Arctic Context Kielipalvelut Ky | Professional & scientific | 2025 |
| Arctic Divers Oy | Construction | 2025 |
| Arctic Drilling Company Group Oy | Mining & quarrying | 2025 |
| Arctic Drilling Company Oy Ltd | Mining & quarrying | 2004 |
| Arctic Driving Center Oy | Arts & recreation | 1984 |
| Arctic Enat Oy | Mining & quarrying | 2022 |
| Arctic Energy Developers Oy | Professional & scientific | 2025 |
| Arctic Energy Oy | Construction | 2022 |
| Arctic Filter Cleaning Oy | Other services | 2025 |
| Arctic Fishing Oy | Administrative & support | 2023 |
| Arctic Flora Oy | Professional & scientific | 2020 |
| Arctic Flying Guide House Ky | Hospitality | 2002 |
| Arctic Funday Oy | Administrative & support | 2021 |
| Arctic GM Experiences OY | Administrative & support | 2023 |
| Arctic Garden Hotel Oy | Hospitality | 2026 |
| Arctic Golf Oy | Arts & recreation | 1992 |
| Arctic Heart Oy | Hospitality | 2018 |
| Arctic Holding Oy | Hospitality | 2014 |
| Arctic Hoods Oy | Arts & recreation | 2020 |
| Arctic Host Oy | Hospitality | 2024 |
| Arctic Intel Oy | Health & social care | 2023 |
| Arctic Invest Oy | Real estate | 2011 |
| Arctic Light Hotel Oy | Hospitality | 2013 |
| Arctic Lines Oy | Information & communication | 2018 |
| Arctic Live Oy | Hospitality | 2010 |
| Arctic Living Oy | Real estate | 2018 |
| Arctic Maalaus Oy | Construction | 2026 |
| Arctic Motion Oy | Wholesale & retail | 2022 |
| Arctic Native Oy | Administrative & support | 2024 |
| Arctic Nexus Oy | Professional & scientific | 2024 |
| Arctic Nomads Oy | Administrative & support | 2025 |
| Arctic Olle Oy | Professional & scientific | 2025 |
| Arctic Panorama Oy | Hospitality | 2024 |
| Arctic Pipe Building Oy | Construction | 2013 |
| Arctic Premises Oy | Real estate | 2026 |
| Arctic Protection Oy | Administrative & support | 2007 |
| Arctic Rally Center Oy | Administrative & support | 2015 |
| Arctic Rane Oy | Financial services | 2020 |
| Arctic Real Estate Oy | Real estate | 2020 |
| Arctic Resilience Oy | Education | 2026 |
| Arctic Road Runners Oy | Arts & recreation | 2023 |
| Arctic Road Trips Oy | Administrative & support | 2022 |
| Arctic Sales Oy | Financial services | 2016 |
| Arctic Security Guards avoin yhtiö | Administrative & support | 2022 |
| Arctic Sisu Adventures Oy | Administrative & support | 2026 |
| Arctic Snowmen Oy | Construction | 2017 |
| Arctic Spice Factory Oy | Professional & scientific | 2026 |
| Arctic Stay Oy | Hospitality | 2026 |
| Arctic Stream Oy | Professional & scientific | 2018 |
| Arctic Taxi Oy | Transport & logistics | 2011 |
| Arctic Testing Services Oy | Professional & scientific | 2007 |
| Arctic Timber Center Oy | Construction | 1997 |
| Arctic Travel Services Oy | Transport & logistics | 2018 |
| Arctic Ventures Oy | Arts & recreation | 2023 |
| Arctic Viking Oy | Transport & logistics | 2020 |
| Arctic Vision Oy | Manufacturing | 2007 |
| Arctic Wellness Oy | Arts & recreation | 2013 |
| Arctic Wheels Oy | Arts & recreation | 1987 |
| Arctic Workshop Oy | Manufacturing | 2020 |
| Arctic cooking Oy | Manufacturing | 2020 |
| Arctic lights video factory Oy | Information & communication | 2020 |
| Arctica Coaching & Consulting Oy | Professional & scientific | 2017 |
| Arcticautorent Oy | Administrative & support | 2026 |
| Arcticfysio Oy | Health & social care | 2019 |