| AB Famab OY | Real estate | 2021 |
| Ab B - G Nygårds Grönsaker Oy | Agriculture & fishing | 1995 |
| Ab CPT Besiktning-Katsastus Oy | Professional & scientific | 2013 |
| Ab Mobicut Oy | Agriculture & fishing | 2000 |
| Ab Storthors Rör Oy | Construction | 2012 |
| Ab Övermark Café Oy Närpes | Real estate | 2003 |
| Axparts Ab | Wholesale & retail | 2023 |
| Bettes Taxi Ab Oy | Transport & logistics | 2011 |
| Brandsläckarservice Franzen öppet bolag | Manufacturing | 2017 |
| Byggtjänst Jan-Anders Åbrandt Ab | Construction | 2012 |
| Byggtjänst Åbrant Ab | Construction | 2019 |
| EC-Invest Ab Oy | Real estate | 2024 |
| Ekotorppa Oy | Wholesale & retail | 2013 |
| Fastighets Ab Övermark Sparsam | Real estate | 2022 |
| Groop Pälsfarm Ab | Agriculture & fishing | 2013 |
| Häggblads Grönsaker Ab | Agriculture & fishing | 2021 |
| Häggmix Ab | Manufacturing | 1994 |
| Irdyn's Kebab & Burek Kommanditbolag | Hospitality | 2014 |
| John Vesterlund Ab | Agriculture & fishing | 1983 |
| Kalles Grönsaker Ab | Agriculture & fishing | 2013 |
| Kb Kakkuris Möbel Ky | Wholesale & retail | 1985 |
| Kb Malms Transport | Transport & logistics | 1986 |
| Kitupiikki Oy | Hospitality | 2008 |
| Kråkvilan Garden & Wellness öppet bolag | Agriculture & fishing | 2021 |
| Lind Frakt Öppet bolag | Transport & logistics | 2019 |
| Lind Wellness Kb | Other services | 2016 |
| Lindgrens Åkeri Ab Oy | Transport & logistics | 1986 |
| Liten & Fin Barnbeklädnadsaffär öppet bolag | Transport & logistics | 1993 |
| Ljung-Trans Kb | Transport & logistics | 1986 |
| Lybäck Homes Ab | Real estate | 2024 |
| Lybäcks jobbtjänst Kb | Administrative & support | 2024 |
| Lönnvik Transport Ab | Transport & logistics | 1994 |
| M Nordström Ab | Agriculture & fishing | 2008 |
| MH Grönsaker Ab | Agriculture & fishing | 2012 |
| Martens & Eriksson Fastighets Ab | Real estate | 1995 |
| Martens Fur Ab | Agriculture & fishing | 1995 |
| Motodäck öppet bolag | Wholesale & retail | 1990 |
| NEK Oy | Manufacturing | 1990 |
| NS Bygg & Bo Ab | Construction | 2013 |
| Nordström Trading Ab | Wholesale & retail | 2026 |
| Oy Acmetek | Manufacturing | 2010 |
| Oy Helander Services Ab | Hospitality | 2022 |
| Oy Hemmanet Ab | Agriculture & fishing | 2013 |
| Oy LE Translations Ab | Professional & scientific | 2008 |
| Oy Lykkan Ab | Administrative & support | 2021 |
| Oy Rapid Pack Nordic Ab | Agriculture & fishing | 2009 |
| Oy SK Brandt Ab | Agriculture & fishing | 1992 |
| Oy Steelmark Ab | Wholesale & retail | 2020 |
| P. Snickars Ab Oy | Construction | 1975 |
| Perjus Skogsentreprenad Ab | Agriculture & fishing | 2025 |
| Pukinsaaren Majoitus avoin yhtiö | Hospitality | 2021 |
| RL-Pesu öppet bolag | Other services | 2009 |
| Räfsmossens Fur öppet bolag | Agriculture & fishing | 2015 |
| Rönnholms Blommor Ab Oy | Wholesale & retail | 2026 |
| Rönnlunds Växthus Ab | Agriculture & fishing | 2007 |
| Röös Verkstad kommanditbolag | Other services | 1996 |
| Somsak Växthus, kommanditbolag | Agriculture & fishing | 2013 |
| Steelmark Invest Oy Ab | Wholesale & retail | 1977 |
| Stenforest Ab | Agriculture & fishing | 1989 |
| Strandbo växthusbolag Leif och Roger Bäckstrand | Agriculture & fishing | 1975 |
| Söderlunds Trädgård Oy/Ab | Agriculture & fishing | 2009 |
| Thomas Söderblom Ab | Transport & logistics | 2004 |
| Uffes Måleriservice Ab | Construction | 2012 |
| Villbackens Trä Öppet bolag | Manufacturing | 2004 |
| Övermark Bed & Breakfast Ab | Hospitality | 2017 |
| Övermark Finans Ab | Administrative & support | 1987 |
| Övermark Köttrökeri Öppet bolag | Manufacturing | 1997 |
| Övermark Vattenandelslag | Water & waste | 1939 |
| Övermark Värme Ab | Energy | 2012 |