| Jomala-Studio 2 Kb | Hospitality | 1993 |
| Jonatan Vördgren Holding Ab | Financial services | 2018 |
| Judys Hantverk & Inredning Ab | Manufacturing | 1993 |
| KEO Rederi AB | Transport & logistics | 2019 |
| KVINNOKLINIKEN-AX Ab | Health & social care | 2017 |
| Kappahl Åland Ab | Wholesale & retail | 2002 |
| Karlsgård Ab | Real estate | 2009 |
| Katja Mustonen Ove Kemmelmeier ÖB, öppet bolag | Wholesale & retail | 2002 |
| Kent Saarinen AB | Financial services | 2023 |
| Kitro Ab | Real estate | 2021 |
| Klingbergs Plåtslageri Ab | Construction | 1995 |
| Kodeo Labs Ab | Information & communication | 2020 |
| Kraftnät Åland AB | Energy | 1996 |
| Kvarnström & Lundén Ab | Information & communication | 2021 |
| LB Racing öppet bolag | Administrative & support | 2026 |
| Landsbygdens Skattetjänst Ab | Professional & scientific | 2020 |
| Leovind AB | Energy | 2004 |
| Liv & Lust Hälsokost öppet bolag | Wholesale & retail | 1994 |
| Livskraft Ab | Professional & scientific | 2022 |
| Losdros Ab | Wholesale & retail | 2014 |
| M.B Bygg Ab | Construction | 2015 |
| MARIEHAMNS ELKONSULT Ab | Professional & scientific | 2007 |
| MD Svets & Service Ab | Other services | 2023 |
| MT Fastigheter Ab | Real estate | 2021 |
| MaPa Fishing Team Ab | Administrative & support | 1996 |
| Mansén Invest Ab | Financial services | 2020 |
| Mariehamns Telefon Ab | Information & communication | 1897 |
| Maxx Nauta Labore Ab | Education | 2021 |
| Meyer Engineering Ab | Construction | 2025 |
| Mickes Taxi Ab | Transport & logistics | 2018 |
| Miro-Transport Ab | Transport & logistics | 2005 |
| Måleri Jansson & Karlsson Ab | Construction | 2018 |
| Möbelbutiken Ab i Mariehamn | Wholesale & retail | 1987 |
| Möckelby Fastighets Ab | Real estate | 2020 |
| NiXTec Ab | Other services | 2025 |
| Nixons Ab | Financial services | 2022 |
| Noatun Norra Distribution Ab | Energy | 2024 |
| Noatun Vindpark Norra Ab | Energy | 2022 |
| Noatun Vindpark Södra Ab | Energy | 2022 |
| Noatun Åland Norra Kb | Energy | 2022 |
| Noatun Åland Södra Kb | Energy | 2022 |
| Norrängen Fab | Real estate | 2022 |
| Nova Alandia Ab | Professional & scientific | 2008 |
| OAK Trädgårdsservice Ab | Administrative & support | 2023 |
| Olles El Ab | Construction | 1989 |
| On Fleek Åland Ab | Wholesale & retail | 2019 |
| Orient Masala Ab | Wholesale & retail | 2012 |
| Owlhill Invest Ab | Financial services | 2022 |
| Oy CMX Finland Ab | Hospitality | 1981 |
| Oy MN-Nordina Ab | Professional & scientific | 1996 |
| PA Johansson Ab | Professional & scientific | 2019 |
| PAF-Consulting Abp | Arts & recreation | 1985 |
| PUH Fastighetsförvaltning Ab | Real estate | 2004 |
| Padelcenter Åland AB | Arts & recreation | 2017 |
| Plåtligan, Björklund & Björklund | Construction | 1991 |
| Polka Dot Ab | Manufacturing | 2017 |
| PrimaLube Ab | Wholesale & retail | 2018 |
| Primabil Åland Ab | Other services | 2014 |
| ProPolish Ab | Other services | 2015 |
| Professional Events Åland Ab | Arts & recreation | 2019 |
| Projekt Björkskär Ab | Energy | 2025 |
| RCR Holding AB | Professional & scientific | 2020 |
| Rebeccas Frisör & Fransstylist Ab | Other services | 2017 |
| RedRock Energy Ab | Energy | 2023 |
| RenaHem Åland Ab | Administrative & support | 2019 |
| Riskkontroll Åland Ab | Construction | 2023 |
| Robbans service Ab | Administrative & support | 2021 |
| Roger Jansson öppet bolag | Manufacturing | 1998 |
| Rorsmannen Fastigheter Ab | Real estate | 2012 |
| Rörbolaget Åland Ab | Construction | 2019 |
| SARAX Holding AB | Real estate | 2023 |
| Sinecura AB | Wholesale & retail | 2010 |
| SL Måleri AB | Construction | 2017 |
| SM Elektro Ab | Construction | 2018 |
| SR-Mechanical Ab | Manufacturing | 2020 |
| SSK Byggservice AB | Construction | 2021 |
| ST Fastigheter Ab | Real estate | 2023 |
| Steel FM AB | Information & communication | 1985 |
| SV Bygg Ab | Construction | 2019 |
| SaarCap Ab | Administrative & support | 2018 |
| Sandströms Bygg Ab | Construction | 2014 |
| Sigges Gräv Ab | Construction | 1996 |
| SkoMax Ab | Wholesale & retail | 2013 |
| Snickarboden Ab, Krister Lindberg | Manufacturing | 1984 |
| Soleba Ab | Construction | 1983 |
| Sparhallen Åland Ab | Wholesale & retail | 2016 |
| Sportula Ab | Arts & recreation | 2002 |
| StockMenu Ab | Information & communication | 2026 |
| Styrströms Taxi Öppet bolag | Transport & logistics | 2007 |
| Ståhlmans Ab | Manufacturing | 1989 |
| Sunny Anna Travel & Tourism Management Ab | Administrative & support | 2012 |
| T & S Kompaniet öppet bolag | Hospitality | 2013 |
| Tallbackens lager och fastighets Ab i Jomala | Real estate | 2018 |
| Techno Trade International Oy Ab | Wholesale & retail | 1992 |
| TjÄna Shop PS öppet bolag | Wholesale & retail | 2011 |
| Torbjörn Anderssons Pälsdjursfarm Ab | Agriculture & fishing | 1991 |
| Trivsel Ab | Wholesale & retail | 2007 |
| Träningsverket Ab | Arts & recreation | 2004 |
| Ulfsby Gård Restaurang Ab | Administrative & support | 2022 |
| Untitled Music Group Ab | Information & communication | 2026 |