| NST Finland Oy | Wholesale & retail | 2002 |
| NW Audek Oy | Wholesale & retail | 1977 |
| Nagu Handel Aalto Ab | Wholesale & retail | 1973 |
| Nallebo Oy Ab | Real estate | 2021 |
| Nauku Oy | Information & communication | 2008 |
| Next automaatiot Oy | Professional & scientific | 2024 |
| Nickfix Oy | Transport & logistics | 2024 |
| Nicobis Oy | Professional & scientific | 1990 |
| Nicolina Oy | Wholesale & retail | 2001 |
| Nicoteci Oy | Construction | 2021 |
| Norcolour Oy Ab | Manufacturing | 2011 |
| Nordatrium Oy Ab | Real estate | 2023 |
| Nordic Bio Waste Oy Ab | Water & waste | 2017 |
| Nordic Metal Technologies Oy | Manufacturing | 2025 |
| Nordkalk Oy Ab | Mining & quarrying | 2002 |
| NorthernBytes Ab Oy | Information & communication | 2017 |
| Nova Kapital Oy | Financial services | 2020 |
| Novacura Finland Oy | Information & communication | 2016 |
| Novamea Ab | Financial services | 2025 |
| Novellus Solutions Oy | Professional & scientific | 2015 |
| Nurmio & Karlsson AB | Construction | 2016 |
| OY Nagu Product AB | Hospitality | 2007 |
| Oivo Oy | Real estate | 2021 |
| Omera OÜ Suomen sivuliike | Professional & scientific | 2020 |
| One Entity Oy | Information & communication | 2022 |
| Optiwide Oy | Other services | 1997 |
| Ouvori Oy | Education | 2022 |
| Oy APOLLOSAILS Ab | Wholesale & retail | 2023 |
| Oy Aidventures Ltd | Education | 2009 |
| Oy Air United International Ltd | Wholesale & retail | 2023 |
| Oy Arkipelago Ab | Construction | 2007 |
| Oy Boda Farm Ab | Agriculture & fishing | 2009 |
| Oy CMC Burger Ab | Hospitality | 1991 |
| Oy Conwiss Ab | Professional & scientific | 2013 |
| Oy Datacult Ab | Professional & scientific | 1994 |
| Oy El-Matic kunnossapito | Real estate | 1998 |
| Oy El-Vis Ab | Professional & scientific | 1978 |
| Oy Elm-Dal Ab | Real estate | 2009 |
| Oy Energen Nordic Ab | Construction | 2025 |
| Oy Eriksson Ab | Real estate | 1950 |
| Oy Eurotype Ab | Other services | 1994 |
| Oy Gullkrona Ab | Wholesale & retail | 1982 |
| Oy HL-Construction Ab | Construction | 2020 |
| Oy HL-Metal Ab | Manufacturing | 2016 |
| Oy Hansavia Ab | Transport & logistics | 2026 |
| Oy Hurrigames Ab | Wholesale & retail | 1994 |
| Oy JT Consulting Ab | Professional & scientific | 2008 |
| Oy JesGolf Ab | Administrative & support | 2025 |
| Oy KJ Bäckström Ab | Wholesale & retail | 2015 |
| Oy Kiinteistöpalvelu T. Wallin Fastighetsservice Ab | Administrative & support | 1989 |
| Oy Mälö Marin Ab | Arts & recreation | 2010 |
| Oy NTT Tutech Ab | Hospitality | 1997 |
| Oy Nagusun Ab | Hospitality | 2008 |
| Oy Nelimauste Ab | Hospitality | 2014 |
| Oy Old Bakery Ab LTD | Information & communication | 2010 |
| Oy PLB Service Ab | Manufacturing | 2023 |
| Oy Paltermo Ab | Construction | 1982 |
| Oy Parforest Ab | Agriculture & fishing | 1989 |
| Oy Pargafa Ab | Real estate | 1994 |
| Oy Pargas Marine Service Ab | Manufacturing | 2023 |
| Oy Parlok Ab | Manufacturing | 1985 |
| Oy Pennäs Ab | Real estate | 2021 |
| Oy Porta Marina Ab | Arts & recreation | 1995 |
| Oy Pract Ab | Wholesale & retail | 1987 |
| Oy Probuilders Scandinavia Ab | Construction | 2007 |
| Oy Proforte Brokers Ab | Wholesale & retail | 1992 |
| Oy Proverbis Ab | Professional & scientific | 1989 |
| Oy Reuter Invest Ab | Financial services | 2004 |
| Oy Rowlit Ab | Arts & recreation | 2011 |
| Oy Saariston Vene ja Vihellys Ab | Manufacturing | 2004 |
| Oy Scanex Medical Systems Ab | Wholesale & retail | 1995 |
| Oy Seamore Ab | Transport & logistics | 2026 |
| Oy Sercoma Ab | Professional & scientific | 2005 |
| Oy Sports Gym Pargas Ab | Arts & recreation | 1993 |
| Oy SteKason Service Ab | Manufacturing | 2008 |
| Oy Teräsdesign Ab | Manufacturing | 1986 |
| Oy Topwork Ab | Administrative & support | 2007 |
| Oy Traizore Ab | Real estate | 1989 |
| Oy Trans Matti Jalonen Ab | Transport & logistics | 1996 |
| Oy Tre Små Rum Ab | Wholesale & retail | 2002 |
| Oy Unimusic Ab | Information & communication | 1978 |
| P&M Creations Oy | Wholesale & retail | 2021 |
| Perla Interior OY | Wholesale & retail | 2005 |
| Petar OY | Construction | 2020 |
| PG IntAct Oy Ab | Professional & scientific | 2013 |
| PRGS Finland Oy | Arts & recreation | 2022 |
| PS-Asunnot Oy | Real estate | 2005 |
| PT Invenest Oy | Professional & scientific | 2022 |
| Pamico Oy | Wholesale & retail | 2016 |
| Pamiro Oy | Wholesale & retail | 1975 |
| Par-Fysio Clinic Ab | Health & social care | 2001 |
| ParPadel Oy | Arts & recreation | 2019 |
| Paraisten Bock-Center Oy | Real estate | 1996 |
| Paraisten Halli ja Kone Oy | Real estate | 2023 |
| Paraisten Paussi Portti Oy | Hospitality | 2025 |
| Paraisten Poly-Rak Oy | Manufacturing | 1990 |
| Paraisten Pub Pireus Oy | Hospitality | 1993 |
| Paraisten Venekeskus PVK Oy | Manufacturing | 2011 |
| Paraisten keilahalli Ky | Arts & recreation | 2015 |
| Paraisten viher- ja kiinteistöhuolto Oy | Administrative & support | 2001 |