| Nordic AS | Construction | 2014 |
| Nordic Tactical Supplies AS | Wholesale & retail | 2025 |
| Nordmann Holding AS | Financial services | 2005 |
| Nordmo Vekst AS | Real estate | 2009 |
| Nordmohus AS | Real estate | 2005 |
| Nordpro AS | Professional & scientific | 2015 |
| Nordpure AS | Wholesale & retail | 2025 |
| Nordre Fon Holding AS | | 2021 |
| Nordstjernen Invest AS | | 2026 |
| Nordvalls Etikett AS | Manufacturing | 1996 |
| Norhunt AS | Manufacturing | 2016 |
| Norsk Bibliotektransport AS | Transport & logistics | 2002 |
| Norsk Bilgaranti AS | | 2021 |
| Norsk Byggforsyning AS | Wholesale & retail | 2026 |
| Norwegian Capital Management Holding AS | Real estate | 2007 |
| NT Capital AS | Administrative & support | 2025 |
| Næss Kapital AS | | 2021 |
| Nødstopp AS | Transport & logistics | 2024 |
| Okim A.S | Real estate | 1994 |
| Ola Bygg AS | Construction | 2024 |
| Ole Gunner AS | Real estate | 2005 |
| Olstadmoen Barnehage SA | Education | 2001 |
| Original Eiendom AS | Real estate | 1977 |
| Oslo & Akershus Graveservice AS | Construction | 2018 |
| Oslo Hundefrisørskole AS | Other services | 2017 |
| Oslo Økonomi AS | Professional & scientific | 2025 |
| Outdoor Invest AS | | 2019 |
| Pappa-Taxi AS | | 2021 |
| Parkettsliperiet AS | Professional & scientific | 2021 |
| Pedersens Familiebarnehage Avd. Statfram Da | Education | 2023 |
| Pettersen Snekkertjenester AS | Construction | 2021 |
| Pevi Holding AS | Professional & scientific | 2024 |
| Pietaris AS | Construction | 2012 |
| Piperep AS | Construction | 2013 |
| Pizzadrift Kløfta AS | Hospitality | 2024 |
| Plett Labs AS | Information & communication | 2025 |
| Plommen I Egget Da | Manufacturing | 2004 |
| Prima Regnskap Og Rådgivning AS | Professional & scientific | 2021 |
| Prostyle Da | Wholesale & retail | 2005 |
| Protex Mal AS | Construction | 2025 |
| Pskt Holding AS | | 2026 |
| QPB AS | | 2021 |
| Qreklame AS | Professional & scientific | 2023 |
| Ram's Invest AS | | 2025 |
| Ramsys AS | Information & communication | 2002 |
| Randby Agro AS | Administrative & support | 2023 |
| Randby Gård Da | Health & social care | 2021 |
| Ravenheart International Film Festival AS | Arts & recreation | 2023 |
| Ray Tronic AS | Professional & scientific | 1996 |
| Rba Entreprenør AS | Construction | 2006 |
| RBT Holding AS | Education | 2017 |
| Rdi Energi AS | Wholesale & retail | 2026 |
| Real Eiendom AS | Real estate | 1997 |
| Rebil Drive AS | Wholesale & retail | 2022 |
| Rebil Mobility AS | Wholesale & retail | 2020 |
| Rebil Mobility Group AS | Professional & scientific | 2022 |
| Rebound AS | Real estate | 1988 |
| Regnskapsbureauet AS | Professional & scientific | 1983 |
| Reierstad Invest AS | Real estate | 2012 |
| Reinertsen Holding AS | | 2020 |
| Renovaproff AS | Real estate | 2025 |
| Rensmoen AS | Professional & scientific | 2016 |
| Retas AS | Transport & logistics | 2022 |
| Rett-Takst AS | Real estate | 2014 |
| Ringen Apotek Kløfta AS | Wholesale & retail | 2018 |
| RJ Byggtjenester AS | Construction | 2021 |
| RM Autoteknikk AS | Other services | 2016 |
| Rob Bygg AS | Construction | 2023 |
| Robins AS | Real estate | 2013 |
| Rojas-Bigseth Da | Hospitality | 2007 |
| Rolf Nordmo AS | Real estate | 2005 |
| Rollout Invest AS | | 2026 |
| Romec AS | Administrative & support | 2015 |
| Romerike Anleggsdrift AS | Construction | 1992 |
| Romerike Autohus AS | Wholesale & retail | 2016 |
| Romerike Bil AS | Wholesale & retail | 2012 |
| Romerike Bilformidling AS | Wholesale & retail | 2015 |
| Romerike Buss Og Trailerskole AS | Education | 2005 |
| Romerike Bygg & Vedlikehold AS | Construction | 2019 |
| Romerike Eiendomsmegling AS | Real estate | 2021 |
| Romerike Elektro AS | Construction | 1996 |
| Romerike Estetikk AS | Health & social care | 2026 |
| Romerike Legesenter Da | Health & social care | 2017 |
| Romerike Malermesterforretning AS | Construction | 2018 |
| Romerike Rørleggerbedrift AS | Construction | 2006 |
| Romerike Service & Utleie AS | Administrative & support | 2026 |
| Romerike Snø & Grønt AS | Administrative & support | 2025 |
| Romerike Snø & Grønt Svindal Holding AS | | 2025 |
| Romerike Tannlegesenter AS | Health & social care | 2023 |
| Romerike Traktor Og Maskin AS | Wholesale & retail | 1985 |
| Romerike Ur Og Gull AS | Wholesale & retail | 2002 |
| Romeriksmat AS | Wholesale & retail | 2024 |
| Ronde Holding AS | Professional & scientific | 2026 |
| Rosterud Familiebarnehage AS | Education | 2010 |
| Rototec AS | Construction | 2011 |
| Royale Nordic AS | Administrative & support | 2022 |
| Ruud Havnegang SA | | 1981 |
| Ryum Consulting AS | Information & communication | 2017 |
| Ryum Holding AS | Information & communication | 2017 |
| Råsys AS | Information & communication | 2021 |