| Monå Villavattenandelslag | Water & waste | 2016 |
| Muik Hockey Ab | Arts & recreation | 2017 |
| N3 BYGG Ab | Construction | 2021 |
| NAM Invest Ab | Real estate | 2019 |
| NKBY-Invest Oy | Real estate | 1996 |
| NKL-Partners Ab Oy | Financial services | 2003 |
| NT Logistics AB | Professional & scientific | 2006 |
| NTA Trans Ab | Administrative & support | 2000 |
| NTB Trans Ab | Administrative & support | 2000 |
| NTC Transport Ab | Transport & logistics | 1989 |
| New Aspect Ab | Wholesale & retail | 2000 |
| Nordic Fiber Digging Oy | Construction | 2025 |
| Nordic JD Jerky Ab | Manufacturing | 2025 |
| Novavet Ab | Professional & scientific | 2026 |
| Nt Drivers Ab | Administrative & support | 2007 |
| Nykarleby Centralantennandelslag | Construction | 1970 |
| Nykarleby Fastigheter Ab | Real estate | 2025 |
| Nykarleby Fastighetsservice Ab | Administrative & support | 1991 |
| Nykarleby Företagstjänst, öppet bolag | Professional & scientific | 2017 |
| Nykarleby Hand Team öppet bolag | Construction | 1997 |
| Nykarleby Kraftverk Ab | Energy | 2010 |
| Nykarleby Lastbils Central Ab - Uudenkaarlepyyn Kuorma-auto | Transport & logistics | 1979 |
| Nykarleby Sprinklerpump Ab | Construction | 2008 |
| Nykarleby Spåntak Ab | Construction | 2025 |
| Nykarleby Transportcentral Ab | Real estate | 1985 |
| Nykarleby ambulanstjänst - Uudenkaarlepyyn ambulanssipalvelu, öppet bolag | Health & social care | 1987 |
| Nystedts Gräv Ab | Construction | 1976 |
| OJJ-Invest Ab | Real estate | 2018 |
| OLectronics Ab Oy | Construction | 2024 |
| Omnes Service Ab Oy | Construction | 2024 |
| Osmatika Ab | Agriculture & fishing | 2007 |
| Oy AX-Filter Ab | Manufacturing | 1994 |
| Oy Arcticfood Ab | Wholesale & retail | 1988 |
| Oy BSB Holding Ab | Real estate | 2020 |
| Oy Ellinor Design Ab | Information & communication | 1990 |
| Oy Eur-Mark Ab | Manufacturing | 1992 |
| Oy Juro-Clean Ab | Wholesale & retail | 2012 |
| Oy Kirfer Ab | Manufacturing | 2020 |
| Oy Mekan Trading Ab | Manufacturing | 2020 |
| Oy NY-JA Group Ab | Administrative & support | 2022 |
| Oy Nautimar Ab | Wholesale & retail | 1983 |
| Oy Norcar Ab | Manufacturing | 2015 |
| Oy Nykarleby El-Affär Ab | Wholesale & retail | 1993 |
| Oy Prevex Ab | Manufacturing | 1955 |
| Oy Svarvars Trävaruhandel Ab | Manufacturing | 1978 |
| Oy TrawlMan Ab | Real estate | 2002 |
| PCS Capital Ab Oy | Professional & scientific | 2011 |
| PF Engineering Ab, Oy | Manufacturing | 1998 |
| Phortise AB | Manufacturing | 2023 |
| PPLE The People Company Oy Ab | Administrative & support | 2019 |
| Pedersöre Skogsentreprenad Ab | Agriculture & fishing | 2006 |
| Pig Hill Ab | Agriculture & fishing | 2019 |
| Pigeon Point Ab Oy | Financial services | 2017 |
| Pohjanmaan Monipalvelu Ky | Professional & scientific | 2012 |
| Polar Pipe Clean Ab | Water & waste | 2024 |
| Promasel Oy | Professional & scientific | 2026 |
| Purivia Ab | Wholesale & retail | 2025 |
| Ray Productions öppet bolag | Information & communication | 2014 |
| Red Panda Ab | Agriculture & fishing | 2013 |
| RenTT öbbet bolag | Administrative & support | 2012 |
| Retrospeed öppet bolag | Wholesale & retail | 2017 |
| Rithem Ab | Professional & scientific | 1994 |
| Roger Eriksson Pälsfarm Ab | Agriculture & fishing | 1994 |
| Rory Penttinen Motorsport Ab Oy | Professional & scientific | 2018 |
| SA Trade Ab, Nykarleby | Real estate | 2016 |
| SAW-Päls Ab | Agriculture & fishing | 1994 |
| SP Arc Ab | Financial services | 2025 |
| Stall Banvalla AB OY | Real estate | 2009 |
| Sandhagen Ab | Agriculture & fishing | 2005 |
| Santili's Städservice öppet bolag | Agriculture & fishing | 2009 |
| Scandic Burger & Grill Ab | Hospitality | 2018 |
| Share Your Story Oy Ab | Administrative & support | 2023 |
| Sigges Däck Ab | Other services | 1984 |
| Signature Marketing Oy | Professional & scientific | 2022 |
| Sisustus Inredning Wargendahl Oy Ab | Wholesale & retail | 2022 |
| Sjöholms Pälsfarm Ab | Agriculture & fishing | 1976 |
| Smidyo Ab | Information & communication | 2018 |
| Snårbacka & Frände Transport Ab | Transport & logistics | 1985 |
| Solvest Ab | Financial services | 1987 |
| Sparqvist Ab | Financial services | 1990 |
| Sportsclub Nykarleby Ab Oy | Arts & recreation | 2002 |
| Staffan Gleisner Pälsfarm Ab | Agriculture & fishing | 1996 |
| Stella BQ & S Ab | Agriculture & fishing | 2011 |
| Strandberg Consulting Ab Oy | Professional & scientific | 2018 |
| Studio Fem Ab Oy | Other services | 2020 |
| Sundbergs Målningsarbete öppet bolag | Construction | 1996 |
| Sundells Glassfabrik Ab | Manufacturing | 2024 |
| Söderbacka invest Ab | Agriculture & fishing | 1995 |
| T Eriksson Bygg Ab | Construction | 2016 |
| T. Björkman Öppet bolag | Construction | 2003 |
| TLN Bolagen Ab | Other services | 1989 |
| TORA Fastigheter Ab | Real estate | 2014 |
| TSM Electrics Ab | Construction | 2014 |
| TTS Finland Ab | Mining & quarrying | 2016 |
| Tandklinik J-O Hedman Ab | Health & social care | 2016 |
| Tandklinik Nygård Ab | Health & social care | 2010 |
| Tandklinik SLOTTE Hammasklinikka Ab | Health & social care | 2010 |
| Tevar Ab Oy | Construction | 2012 |
| The Open Table Avoin yhtiö | Arts & recreation | 2025 |
| Trollören Ab | Real estate | 2002 |