| Nilsskog AS | Real estate | 2009 |
| Nilsskog Bygg AS | Construction | 2023 |
| Nilsskog Centrumseiendom AS | Real estate | 1998 |
| Nilsskog Holding AS | | 2005 |
| Nord Betong AS | Construction | 2020 |
| Nord Gondol AS | Real estate | 2017 |
| Nord Og Ned Holding AS | | 2013 |
| Nord Osteopati AS | Health & social care | 2020 |
| Nordblikk AS | Construction | 2026 |
| Nordgård Service Da | Education | 2022 |
| Nordheim Takst & Uavhengig Kontroll AS | Professional & scientific | 2023 |
| Nordisk Maskin Agentur AS | Wholesale & retail | 2024 |
| Nordland Gear Inspeksjon AS | Professional & scientific | 2015 |
| Nordn Drift AS | Administrative & support | 2026 |
| Nordn Kapital AS | | 2026 |
| Nordås Tømrerservice AS | Construction | 2019 |
| Normin AS | Professional & scientific | 2009 |
| Normin Mine AS | Mining & quarrying | 2009 |
| Norrøn Maling AS | Wholesale & retail | 1999 |
| Norsk E-Fuel Mosjøen AS | Manufacturing | 2020 |
| Norsk Umoderne Da | Professional & scientific | 2025 |
| North Star Investments AS | Financial services | 2017 |
| Norwegian Water Power Solutions AS | Professional & scientific | 2020 |
| Nye Nordlandtak AS | Construction | 2023 |
| Nygård Trevarefabrikk AS | Manufacturing | 1986 |
| Nygård Trevarefabrikk Eiendom AS | Real estate | 2007 |
| Nyland Elektro Diesel AS | Other services | 1987 |
| Nyrud Barnehage SA | Education | 1989 |
| Nyrud Eiendom AS | Real estate | 2002 |
| Næstby Eiendom AS | Real estate | 2010 |
| Næstby Entreprenør AS | Construction | 2016 |
| Næstby Fabrikk AS | Manufacturing | 2021 |
| Næstby Holding AS | | 2024 |
| Næstby Trevarefabrikk Ans | Real estate | 1953 |
| Odd Fellow Huset Mosjøen AS | Real estate | 2016 |
| Odd Olsrud & Co AS | Administrative & support | 1996 |
| Oddcoin AS | Real estate | 2007 |
| Ofj Invest AS | Financial services | 2017 |
| Okv Holding AS | Wholesale & retail | 2011 |
| Olderskog AS | Real estate | 2005 |
| Olsrud Byggteknikk AS | Professional & scientific | 2001 |
| Olsrud Eiendom Ans | Real estate | 1995 |
| Olsrud Holding AS | Administrative & support | 2005 |
| Olsrud Invest AS | | 2016 |
| One Grid Operation AS | Information & communication | 2022 |
| P.L.Invest AS | Wholesale & retail | 1997 |
| Pan Thai AS | Hospitality | 2018 |
| Panas Holding AS | | 2022 |
| Partyman AS | Real estate | 1986 |
| Pat Technical Aluminium Solutions AS | Professional & scientific | 2021 |
| Patrick Justad AS | Transport & logistics | 2026 |
| Paul Nygaard AS | Wholesale & retail | 2022 |
| Paul Nygaard Eiendom AS | Real estate | 2024 |
| Paulsen Tur Og Aktivitet AS | Health & social care | 2017 |
| Peab Holding AS | Real estate | 2005 |
| Pebå AS | Hospitality | 2013 |
| Per Jakob Eiendom AS | Real estate | 1996 |
| Petter Dassgt. 3 AS | Real estate | 1995 |
| Piri Holding AS | Wholesale & retail | 2022 |
| Pit Stop Mosjøen AS | Wholesale & retail | 2022 |
| Pizzaria Mosjøen AS | Hospitality | 2025 |
| PJH Holding AS | Construction | 2005 |
| Playful Rebels AS | Information & communication | 2019 |
| Pmt-Group AS | Wholesale & retail | 1996 |
| Poparkivet Da | Arts & recreation | 2008 |
| Prius Consulting AS | Real estate | 2004 |
| Prius Eiendom AS | Real estate | 2012 |
| Proff Servicesystemer Ans | Administrative & support | 2001 |
| PTG Helgeland AS | Construction | 2003 |
| Radon 222 AS | Professional & scientific | 2010 |
| Ranvå Bygg & Tjenester AS | Construction | 2026 |
| Raster Games AS | Information & communication | 2013 |
| Re-Met AS | Wholesale & retail | 2008 |
| Regnbuen Barnehage Mosjøen AS | Education | 1991 |
| Reinfjell Transport AS | Transport & logistics | 2022 |
| Reklame-Kameratene AS | Professional & scientific | 2008 |
| Remedia Eiendom AS | Real estate | 2014 |
| Rentali AS | Real estate | 2021 |
| Retura Shmil AS | Water & waste | 1992 |
| Rigdok AS | Information & communication | 2026 |
| Rm-Regnskap AS | Professional & scientific | 2022 |
| Rnæ Holding AS | | 2025 |
| Robin Eldnes AS | Wholesale & retail | 2019 |
| Romson Invest AS | | 2018 |
| Ronin Horde SA | Arts & recreation | 2018 |
| RP Personell AS | Administrative & support | 2019 |
| Rubeco AS | Construction | 2005 |
| Rubin AS | Real estate | 2002 |
| Rugg AS | Real estate | 2007 |
| Rune Lyng AS | Wholesale & retail | 2018 |
| Rune Øybakken AS | Construction | 2017 |
| Rynes AS | Wholesale & retail | 2001 |
| Rønnes Eiendom AS | Real estate | 1998 |
| Rørleggermester Bjørn Olsrud AS | Construction | 2013 |
| Rørleggern Stenvall AS | Construction | 1995 |
| Rørviks Begravelsesbyrå AS | Other services | 1995 |
| Rørviks Blomster AS | Wholesale & retail | 1996 |
| S B Invest AS | Real estate | 2015 |
| S-Bredesen Holding AS | Professional & scientific | 2019 |
| Saga Sol AS | Other services | 2022 |