| Nygårdsgaten Maling Og Jernvare AS | Wholesale & retail | 1995 |
| Nygårdshøyden Eiendom AS | Real estate | 1999 |
| Nygårdslien Utvikling AS | Real estate | 2017 |
| Nygårdsporten AS | Real estate | 2007 |
| Nyhaugen AS | Real estate | 2019 |
| Nyhaugen Holding AS | Real estate | 2026 |
| Nyhavn Butikkdrift AS | Wholesale & retail | 2020 |
| Nyhavn Eiendom AS | | 2021 |
| Nyhavn Invest AS | Hospitality | 2005 |
| Nyheimaase AS | | 2020 |
| Nykirkebakken 2 AS | Real estate | 2013 |
| Nylandsveien Boliglag AS | Households | 1954 |
| Nyparadis 76 AS | Real estate | 2017 |
| Nær-Mat AS | Wholesale & retail | 2011 |
| Nærheim Holding AS | | 2023 |
| Næringsmegling Vest AS | Real estate | 2020 |
| Næringspartner Bergen Da | Administrative & support | 1994 |
| Nærmiljø Hage Og Anlegg AS | Administrative & support | 2003 |
| Nærsenter Vest AS | Real estate | 2018 |
| Nærsenter Vest Butikkeiendom AS | Real estate | 2020 |
| Næss Kapital Og Forvaltning AS | | 2024 |
| Nö Records AS | Information & communication | 2024 |
| Nøsteboden AS | Real estate | 2009 |
| Nøsteboden Selskapslokaler Og Bierstube AS | Hospitality | 2009 |
| Nøstegaten 71B AS | Real estate | 2024 |
| Nøstegaten 72-74 AS | Real estate | 2003 |
| Nøstet AS | Real estate | 2017 |
| Nøstet Brygge AS | Real estate | 2011 |
| Nøstet Dagligvare AS | Wholesale & retail | 2015 |
| Nøstet Eiendom AS | Real estate | 2025 |
| Nøstet Invest AS | Real estate | 2019 |
| Nøstet Kapital AS | Real estate | 2014 |
| Nøstet Pizza AS | Hospitality | 2016 |
| Nøstet Sjøfront AS | Real estate | 1984 |
| Nøstetorget V AS | Real estate | 2007 |
| Nøttveit Boligpark AS | Real estate | 2012 |
| O K Kjemi Vest Ans | Wholesale & retail | 1995 |
| O.K.A Holding AS | Financial services | 2018 |
| O.Lernes Holding AS | | 2026 |
| O.Miancho Holding AS | | 2025 |
| O.T Logistikk AS | Transport & logistics | 2021 |
| O.W. Bunker & Trading | Wholesale & retail | 2014 |
| Oakwyn AS | Wholesale & retail | 2025 |
| Oamm Holding AS | | 2025 |
| Oas Holding AS | | 2017 |
| Obas Entreprenør AS | Construction | 1991 |
| Object Object AS | Professional & scientific | 2020 |
| Obos Ulveseth Utvikling AS | Real estate | 2011 |
| Obs Ung AS | Arts & recreation | 2026 |
| Oca Holding AS | Real estate | 2024 |
| Occam Technologies AS | | 2024 |
| Ocean Forest AS | Professional & scientific | 2013 |
| Ocean TG Norway AS | Information & communication | 1986 |
| Oceaneye AS | Wholesale & retail | 2023 |
| Oceanspace Media AS | Information & communication | 2020 |
| Oceanview Venture Capital AS | Professional & scientific | 2018 |
| Octopod Holding AS | | 2024 |
| Oculomotorius AS | Health & social care | 2009 |
| Odd Monsen AS | Professional & scientific | 2006 |
| Oddell AS | Real estate | 2006 |
| Odden Shipping AS | Transport & logistics | 2017 |
| Odel-Huset AS J Jacobsen | Real estate | 1977 |
| Odfjell Bordeaux AS | Financial services | 2020 |
| Odfjell Chemical Tankers AS | Transport & logistics | 1996 |
| Odfjell Chemical Tankers II AS | Transport & logistics | 2020 |
| Odfjell Chemical Tankers III AS | Transport & logistics | 2025 |
| Odfjell Chemical Tankers IV AS | Transport & logistics | 2025 |
| Odfjell Eiendom AS | Real estate | 1995 |
| Odfjell Eiendomsforvaltning AS | Real estate | 2003 |
| Odfjell Family Holding AS | Financial services | 2005 |
| Odfjell Hakata Maritime AS | Transport & logistics | 2025 |
| Odfjell Insurance & Properties AS | Transport & logistics | 1981 |
| Odfjell Management AS | Transport & logistics | 2008 |
| Odfjell Maritime Services AS | Transport & logistics | 2008 |
| Odfjell Palermo AS | Transport & logistics | 2020 |
| Odfjell SE | Transport & logistics | 1920 |
| Odfjell Tankers AS | Transport & logistics | 1997 |
| Odfjell Terminals AS | Real estate | 2000 |
| Odfjell Terminals Global Holding AS | Mining & quarrying | 2024 |
| Odfjell Terminals Us Holding AS | | 2024 |
| Odfjell Wind AS | Financial services | 2011 |
| Odin Adventures AS | Real estate | 1999 |
| Odin Investering AS | Real estate | 2003 |
| Odin Prosjekt AS | Professional & scientific | 2009 |
| Odin Software Ans | Information & communication | 2002 |
| Oe Kapitalforvaltning AS | | 2024 |
| Oee Invest AS | Real estate | 2015 |
| Oestvik Energy AS | Administrative & support | 2016 |
| Of Holding AS | Financial services | 2008 |
| Off Carnaby Da | Wholesale & retail | 2016 |
| Offshore Marine Consulting AS | Professional & scientific | 2023 |
| Offworld AS | Information & communication | 2017 |
| Ofø Invest AS | | 2021 |
| Ohio AS | Arts & recreation | 2015 |
| Ohjoy Ventures AS | Professional & scientific | 2023 |
| Oiid AS | Information & communication | 2000 |
| Ojk Invest AS | | 2026 |
| Ok Bodega AS | Hospitality | 2021 |
| Okasi 1 AS | Information & communication | 2024 |
| Okjen 28 AS | Real estate | 2022 |