| Mossefinn Invest AS | Real estate | 2005 |
| Motorsyklisten AS | Wholesale & retail | 1983 |
| MSL Elektro Og Rådgivning AS | Construction | 2019 |
| Musicolog in Vest AS | Education | 1993 |
| Mussland International Consulting AS | Professional & scientific | 2007 |
| Myva AS | Wholesale & retail | 2005 |
| Nattrutekaien 6 AS | Real estate | 2017 |
| Nattrutekaien AS | Real estate | 2006 |
| NBS Holding AS | | 2021 |
| NDG Shop AS | Information & communication | 2014 |
| Nedstrand Feriehus AS | Real estate | 2024 |
| Neset Invest AS | | 2005 |
| Nest Design AS | Professional & scientific | 2021 |
| Nesvat AS | | 2019 |
| Netthandel Da | Wholesale & retail | 2020 |
| Nevermind MC Da | Wholesale & retail | 2003 |
| News-Cafe AS | | 2003 |
| NGR Byggmester AS | Construction | 2025 |
| Ninvest AS | Financial services | 2001 |
| Noa Utvikling AS | Construction | 1996 |
| Noa Vest Holding AS | Professional & scientific | 2008 |
| Noa VVS AS | Construction | 2015 |
| Noak Montasje AS | Construction | 2015 |
| Nobel Mote AS | Wholesale & retail | 2019 |
| Nonaas AS | Financial services | 2017 |
| Noramaskin AS | | 2024 |
| Norbygg Stord AS | Construction | 2014 |
| Nordbygdo Sau Ans | Agriculture & fishing | 2014 |
| Nordhus Eigedom AS | Real estate | 2013 |
| Nordplan Stord AS | Professional & scientific | 2016 |
| Norganics Da | Agriculture & fishing | 2025 |
| Norsea Denmark Nuf | Administrative & support | 2019 |
| Norsk Vindusvask AS | Administrative & support | 2018 |
| Northbyte Da | Manufacturing | 2018 |
| Norwegian Investment AS | Professional & scientific | 2020 |
| Norwegian Mooring AS | Professional & scientific | 2019 |
| Notahaugsbryggjo Ans | Real estate | 1990 |
| Notahaugsbryggjo AS | Real estate | 2005 |
| Notva AS | | 2005 |
| Nove AS | Construction | 2019 |
| Nover AS | Professional & scientific | 2020 |
| NW Vedlikeholdservice AS | Construction | 2012 |
| Nye Garnbua Ans | Wholesale & retail | 1990 |
| Nye LT Finans AS | | 2024 |
| Nye Ytre Matre Energi AS | Energy | 2025 |
| Nyland Stord AS | Real estate | 2007 |
| Nyleio AS | | 2025 |
| Nylund Services AS | Administrative & support | 2026 |
| Nysæter Invest AS | Real estate | 2003 |
| Nyth AS | | 2026 |
| Nål & Tråd AS | Wholesale & retail | 2014 |
| O G Larsen Holding AS | Financial services | 2007 |
| O Kjelsnes Holding AS | | 2020 |
| Ocean Cleaning AS | Professional & scientific | 2019 |
| Octa AS | Real estate | 2019 |
| Oddøy AS | Construction | 2005 |
| Odont AS | Professional & scientific | 2013 |
| Offshore Partner AS | Administrative & support | 2002 |
| Ofl Investment AS | | 2023 |
| Ohw AS | | 2020 |
| Ok Helland AS | Construction | 2021 |
| Okerholm Invest AS | Financial services | 2015 |
| Olderdalen 20 AS | Real estate | 2019 |
| Olderdalen Fus Kulturbarnehage AS | Education | 2018 |
| Olderdalen Næringsbygg AS | Real estate | 2007 |
| Ole Vaagen Mineralvannfabrikk AS | Manufacturing | 2021 |
| Olveaks Holding AS | | 2026 |
| Oma Baat Eiendom AS | Real estate | 2020 |
| Oma Baatbyggeri AS | Manufacturing | 1972 |
| Oma Holding Stord AS | Manufacturing | 2020 |
| Oma Slipp & Mekaniske Verksted AS | Manufacturing | 1981 |
| Oma Slipp Eiendom AS | Real estate | 2020 |
| Omløp AS | Wholesale & retail | 2026 |
| Onarheim Kraftverk AS | Energy | 2023 |
| Onesource Holding AS | Manufacturing | 2018 |
| Opero AS | Health & social care | 2020 |
| Opero Holding AS | Education | 1978 |
| Opero Pluss AS | Education | 2022 |
| Orelta Holding AS | | 2026 |
| Organizalon AS | Information & communication | 2026 |
| Oriental Cuisine AS | Hospitality | 2018 |
| Origo Core AS | | 2026 |
| Os Nærings- Og Logistikkpark AS | Real estate | 2020 |
| Osbo AS | Professional & scientific | 2020 |
| Osen 5 AS | Real estate | 2006 |
| Osen 8 AS | Real estate | 2007 |
| Osen Eiendom Holding AS | Real estate | 2023 |
| Osen Vekst AS | Real estate | 2024 |
| Osvald Pub AS | Hospitality | 2001 |
| Osvang AS | Real estate | 1968 |
| Osvang II AS | Real estate | 2018 |
| Otterøen Holding AS | Professional & scientific | 2012 |
| Ove K Helland AS | Construction | 2015 |
| P&S Invest AS | Financial services | 2013 |
| Paavo AS | | 2021 |
| Pacta Holding AS | | 2009 |
| Padel Gruppen AS | Arts & recreation | 2019 |
| Paladio AS | Real estate | 1994 |
| Paletten Kunst & Hobby Ans | Wholesale & retail | 1990 |
| Pepper Hårstudio AS | Other services | 2005 |