| NetCon Finland Oy | Professional & scientific | 2009 |
| Nextal Fiber Optics Oy | Construction | 2026 |
| Niak Oy | Construction | 1982 |
| Nicas Transport Oy | Transport & logistics | 2026 |
| Niemenkylän Kiinteistöt Oy | Real estate | 2012 |
| Nikkanen Consulting Oy | Professional & scientific | 2018 |
| Nikkarin Sauna ja Lista Oy | Construction | 2011 |
| Niks Naks Finland Oy | Other services | 2019 |
| Ninavaloa Oy | Other services | 2022 |
| Nisarak Oy | Construction | 2021 |
| Nocta Oy | Other services | 2024 |
| Nokian Profiilit Oy | Wholesale & retail | 2010 |
| Nordic Cottages Oy | Hospitality | 2019 |
| Nordic Digital Design Oy | Information & communication | 2016 |
| Nordic Lodge Oy | Hospitality | 2025 |
| Nordic Luxury Homes Oy | Manufacturing | 2025 |
| Nordic Standard Goods Oy | Wholesale & retail | 2020 |
| Nordic Works Group Oy | Transport & logistics | 2025 |
| Nordslav Oy | Manufacturing | 2010 |
| North Light Music Oy | Information & communication | 1997 |
| Northnuance oy | Manufacturing | 2013 |
| Noukka Invest Oy | Professional & scientific | 2026 |
| Nummela Sports Center Oy | Arts & recreation | 2024 |
| Nummelan Aluelämpö Oy | Energy | 1985 |
| Nummelan Autoapu Oy | Other services | 2024 |
| Nummelan Autohalli Oy | Real estate | 2025 |
| Nummelan Autohuolto Oy | Other services | 2004 |
| Nummelan Automaalaamo Oy | Other services | 1996 |
| Nummelan Autopiste Oy | Other services | 1992 |
| Nummelan Hallit Oy | Real estate | 2019 |
| Nummelan Hevostila Oy | Arts & recreation | 2019 |
| Nummelan Hiuskolmio Oy | Other services | 2007 |
| Nummelan Huolto ja Saneeraus Ky | Construction | 1984 |
| Nummelan Huoltokaksikko Oy | Administrative & support | 1993 |
| Nummelan Idea-Tekniikka Oy | Manufacturing | 1987 |
| Nummelan Kaakelikeskus Oy | Wholesale & retail | 1999 |
| Nummelan Keskuskenkä Oy | Wholesale & retail | 1976 |
| Nummelan Laituri Oy | Real estate | 1946 |
| Nummelan Neilikka Oy | Hospitality | 2019 |
| Nummelan Osteofysio Oy | Health & social care | 2015 |
| Nummelan Putkisaneeraus Oy | Construction | 2008 |
| Nummelan Ratastien Kiinteistöt Oy | Real estate | 1983 |
| Nummelan Rautarakenne Oy | Manufacturing | 2009 |
| Nummelan Silkkitie Oy | Wholesale & retail | 2000 |
| Nummelan Sähkötyö Mansillat Oy | Construction | 2018 |
| Nummelan Sähkötyö NST Oy Laitalat | Construction | 1989 |
| Nummelan Tilikulma Oy | Professional & scientific | 2009 |
| Nummelan Tilipalvelu Oy | Professional & scientific | 2016 |
| Nummelan Tilipiste Oy | Professional & scientific | 2019 |
| Nummelan Yrityspalvelu Sakesa Ky | Administrative & support | 1999 |
| Nummelan autofix Ky | Other services | 2008 |
| Nummelan kiipeilyverstas Oy | Arts & recreation | 2020 |
| Nummelanharjun Energia Oy | Energy | 2024 |
| Nummelanharjun Lämpö Oy | Energy | 1965 |
| Numset Oy | Administrative & support | 2021 |
| Nykitek Oy | Construction | 2016 |
| Nyyti Productions Oy | Arts & recreation | 2022 |
| Näyttökoe Oy | Information & communication | 1994 |
| O.P. 2nd Gen Oy | Professional & scientific | 2022 |
| OM Tennis Oy | Arts & recreation | 2022 |
| OPM Finland Oy | Construction | 2017 |
| OPRE Group Oy | Administrative & support | 2022 |
| Oh My Deli Oy | Hospitality | 2023 |
| Ojamart Oy | Administrative & support | 1994 |
| Okaris Oy | Professional & scientific | 1981 |
| OlympicBulls Hki Oy | Agriculture & fishing | 2024 |
| Oma Kylän TAXI OY | Transport & logistics | 2023 |
| Omataidekoulu NR Oy | Arts & recreation | 2023 |
| OnFia Oy | Information & communication | 2012 |
| Onnikander Oy | Professional & scientific | 2026 |
| Onym Oy | Construction | 2022 |
| Optiboy Oy | Wholesale & retail | 1996 |
| Optimumcasa Oy | Construction | 2008 |
| Optogear Oy | Professional & scientific | 2008 |
| Orcid Oy | Manufacturing | 1987 |
| Osmotek Oy | Education | 1973 |
| Osuuskunta Linnanniittu | Real estate | 2006 |
| Oy Akijan Ab | Wholesale & retail | 1989 |
| Oy Contrevo Ltd. | Information & communication | 2013 |
| Oy Editext Ab | Professional & scientific | 1985 |
| Oy Fin Prise Ltd | Professional & scientific | 1993 |
| Oy Hammaspalvelu Hotti Ab | Health & social care | 2015 |
| Oy Heikkonen Consulting Ab | Professional & scientific | 1982 |
| Oy Herlin & Co Ab | Wholesale & retail | 1997 |
| Oy IEA-Consulting Ltd | Information & communication | 1997 |
| Oy Koda Productions Ab | Information & communication | 2001 |
| Oy Ojakkalantie Ab | Real estate | 2009 |
| Oy Pride & Joy Ab | Professional & scientific | 1990 |
| Oy Profes Partners Ltd | Real estate | 1990 |
| Oy Tilitoimisto Proximo Ab | Professional & scientific | 1995 |
| Oy Trotting Masters Services Finland Ab Ltd | Arts & recreation | 1997 |
| P&J Konsultointi Oy | Professional & scientific | 1997 |
| P. Kyllönen Ky | Manufacturing | 1988 |
| PA-Rakki Oy | Arts & recreation | 2017 |
| PE20 Oy | Real estate | 2019 |
| PH Clothing Oy | Wholesale & retail | 2020 |
| PJR Investments Oy | Information & communication | 2013 |
| PKS-Toimistot Oy Kalevi Suominen | Real estate | 1988 |
| PL Action Oy | Transport & logistics | 2001 |
| PSI-Group Oy | Professional & scientific | 1992 |