| 2E Holding Ab Oy | Financial services | 2021 |
| 3MY Ab | Real estate | 2020 |
| 4E Antenna Finland Oy | Manufacturing | 2018 |
| A C W Mekaniska Kb | Manufacturing | 1989 |
| AC Cleaning Hydrokleen Ab Oy | Administrative & support | 2019 |
| Ach Architecture AB | Professional & scientific | 2008 |
| AF Solutions Ab Oy | Wholesale & retail | 1993 |
| AG Commerce Ab | Wholesale & retail | 2025 |
| AJ MultiService Ab | Construction | 2021 |
| AK-Golv Ab | Construction | 2018 |
| ALBA Invest Ab | Construction | 2020 |
| Alm Sport AB OY | Wholesale & retail | 2017 |
| ALTUMGROVE Ab | Professional & scientific | 2018 |
| ANAHAND Ab | Wholesale & retail | 2018 |
| ANEDAR Ab Oy | Professional & scientific | 2013 |
| AP.FixIt Oy | Construction | 2026 |
| APEX BC Ab | Professional & scientific | 2019 |
| ARB synchrony Oy | Professional & scientific | 2021 |
| ASTEP Ab | Construction | 2011 |
| AURORA Siivouspalvelu Oy | Administrative & support | 2021 |
| AWM Ab | Administrative & support | 2023 |
| Ab A-Importer Oy Ltd | Wholesale & retail | 2005 |
| Ab AXIA Security Services Oy | Administrative & support | 2021 |
| Ab Ainasoja Invest Oy | Real estate | 2022 |
| Ab Annikas Klippstudio Oy | Other services | 1985 |
| Ab Asve-San Oy | Professional & scientific | 1998 |
| Ab B. Portin Oy | Manufacturing | 2026 |
| Ab Bageri Bergwall Leipomo Oy | Manufacturing | 1972 |
| Ab Bageri Luukkonen Oy | Manufacturing | 2011 |
| Ab Baltic Boat Yard Oy | Real estate | 2007 |
| Ab Bilelektra Oy | Other services | 2001 |
| Ab Björknäs Lägenhet | Agriculture & fishing | 2019 |
| Ab Bothnia Service Oy | Manufacturing | 2003 |
| Ab Botnia Information PAP Oy | Professional & scientific | 2001 |
| Ab Botnia Sunforce Oy | Administrative & support | 2016 |
| Ab Br. Asplund Oy | Construction | 2012 |
| Ab Bris Invest | Agriculture & fishing | 1990 |
| Ab Bröderna Ekman Oy | Hospitality | 2011 |
| Ab Bröderna Jansson Oy | Manufacturing | 1975 |
| Ab Byggmann Oy | Construction | 2012 |
| Ab Bäck & Co Oy | Wholesale & retail | 1970 |
| Ab C&J Service Oy | Wholesale & retail | 2008 |
| Ab C.J. Riska Oy | Real estate | 2010 |
| Ab CML-Emas Invest Oy | Financial services | 1980 |
| Ab Cabocon Oy | Professional & scientific | 2010 |
| Ab Cap North Oy | Financial services | 1997 |
| Ab Club Maharaja Oy | Hospitality | 1994 |
| Ab Composite Center Oy | Manufacturing | 2016 |
| Ab Connectus Oy | Construction | 2008 |
| Ab Cozmoz Oy | Construction | 1990 |
| Ab Datacon Oy | Professional & scientific | 1995 |
| Ab Datic Invest Oy | Professional & scientific | 2025 |
| Ab Datic Oy | Professional & scientific | 1979 |
| Ab Depani Oy | Real estate | 2016 |
| Ab Dinova Oy | Financial services | 1987 |
| Ab Don Invest Oy | Financial services | 1981 |
| Ab E & R Consult Oy | Professional & scientific | 2008 |
| Ab Edizon Oy | Professional & scientific | 2014 |
| Ab Ekorosk Oy | Water & waste | 1991 |
| Ab FINCOVER Oy | Wholesale & retail | 2006 |
| Ab FN Konditori Oy | Hospitality | 2003 |
| Ab FT Borgmästargrund Oy | Real estate | 2003 |
| Ab Faga Oy | Transport & logistics | 2020 |
| Ab Farmanda Oy | Agriculture & fishing | 1990 |
| Ab Farmanda Räv | Agriculture & fishing | 1993 |
| Ab Fixafell Oy | Manufacturing | 2003 |
| Ab Forsman Group Oy | Transport & logistics | 1982 |
| Ab Foto Elite Oy | Wholesale & retail | 1993 |
| Ab Furiren Oy | Wholesale & retail | 2005 |
| Ab G. Koskela Oy | Construction | 1984 |
| Ab Gloo Creative Studio Oy | Information & communication | 2017 |
| Ab Golf Addicts Finland Oy | Arts & recreation | 2014 |
| Ab H. Höglund Oy | Wholesale & retail | 1976 |
| Ab HHTV-Invest Oy | Real estate | 2019 |
| Ab Hair Fashion Kitti & Maria Oy | Other services | 1993 |
| Ab Henry Björk Oy | Wholesale & retail | 1978 |
| Ab Herrmans Måleri Oy | Construction | 1989 |
| Ab Häggblom Invest Oy | Real estate | 1981 |
| Ab Ingenjörsbyrå Bj. Häggblom Oy | Professional & scientific | 2025 |
| Ab J Snellman Oy | Administrative & support | 2017 |
| Ab J&S Kierrätys Oy | Water & waste | 2022 |
| Ab J.Åkerlund Oy | Manufacturing | 2020 |
| Ab JA Rör Oy | Construction | 2017 |
| Ab JTRR-Invest Oy | Real estate | 2009 |
| Ab Jake-Invest Oy | Real estate | 2000 |
| Ab Jakobstads Bilskola | Education | 1970 |
| Ab Jakobstads Bokföringsbyrå | Professional & scientific | 1970 |
| Ab Jakobstads Bokhandel - Pietarsaaren Kirjakauppa Oy | Wholesale & retail | 1928 |
| Ab Jakobstads Båtvarv Oy | Manufacturing | 2010 |
| Ab Jakobstads Ishall - Pietarsaaren Jäähalli Oy | Arts & recreation | 1986 |
| Ab Jakobstads Jordbyggnads Oy | Financial services | 1987 |
| Ab Jakobstads Reburat Oy | Construction | 1995 |
| Ab Jakobstads Slip - Pietarsaaren Telakka Oy | Real estate | 2017 |
| Ab Jakobstads Tennishall | Arts & recreation | 1994 |
| Ab Jakobstadsregionens Utvecklingsbolag Concordia | Professional & scientific | 1992 |
| Ab Juristbyrå Anders Boström | Professional & scientific | 2013 |
| Ab KAMALA FINANCE Oy | Financial services | 2002 |
| Ab KH Marketing Oy | Wholesale & retail | 2005 |
| Ab Katarina Näs Oy | Health & social care | 2016 |
| Ab Keymet Oy | Manufacturing | 2006 |