| Majik AS | Financial services | 2005 |
| Marianne Olaussen AS | Real estate | 2010 |
| Marsteinen AS | Real estate | 1993 |
| Matrix Group AS | Administrative & support | 2003 |
| Michael Carpenter Holding AS | | 2021 |
| Miin Consulting AS | Professional & scientific | 2025 |
| Miki JFC AS | Wholesale & retail | 2009 |
| Miljø- Og Fluidteknikk AS | Manufacturing | 1992 |
| Mill International AS | Wholesale & retail | 1992 |
| Mimar AS | Real estate | 1999 |
| Mittofi AS | | 2024 |
| MK Investor AS | | 2018 |
| Moha AS | Real estate | 2005 |
| Morten Johnsen Holding AS | Wholesale & retail | 1997 |
| MSS AS | Health & social care | 2016 |
| Myrhaugen 24 AS | Real estate | 2019 |
| Natobygget AS | Real estate | 2017 |
| Nettgruppen AS | Information & communication | 2026 |
| Nexttee AS | Wholesale & retail | 2026 |
| NGT Agri AS | Professional & scientific | 2023 |
| Nipple Invest AS | | 2019 |
| No Hands Holding AS | | 2023 |
| Nobel Catering & Conditori AS | Hospitality | 2023 |
| Nobel Catering Eftf AS | Manufacturing | 2000 |
| Noema Da | Education | 2002 |
| Nordbye Holding AS | Wholesale & retail | 2005 |
| Nordmarka Invest AS | Construction | 2005 |
| Nordsikt AS | Information & communication | 2026 |
| Norwegian Green Tech AS | | 2022 |
| Ojjsann Invest AS | | 2025 |
| Ok Invest Holding AS | Real estate | 2005 |
| Olaus Holding AS | | 2020 |
| Ollis Industri AS | Real estate | 2008 |
| Omnit AS | Information & communication | 2025 |
| Orarius AS | Construction | 1996 |
| Oslo Eiendomsinvest AS | Real estate | 1986 |
| Oslo Kulturfabrikk AS | Education | 2017 |
| Padel Co AS | Arts & recreation | 2021 |
| Parctic AS | Information & communication | 2026 |
| Penarctis AS | Wholesale & retail | 1939 |
| Pernilles Vei 5 AS | | 2020 |
| Petite Frisørene Østerås AS | Other services | 1994 |
| Phika AS | Professional & scientific | 2014 |
| Phith Invest AS | Financial services | 2005 |
| Prodcon AS | Construction | 2022 |
| Promech Engineering AS | Professional & scientific | 1988 |
| Pura Vedlikehold AS | Administrative & support | 2020 |
| Pilot Pen Norsk A/S | Wholesale & retail | 1968 |
| Ram Ram AS | Financial services | 2007 |
| Rappers Delight AS | Information & communication | 2023 |
| Rauna Invest AS | Financial services | 2017 |
| Reima Invest AS | Real estate | 2016 |
| Reunion AS | Wholesale & retail | 1978 |
| RG Investment Group AS | | 2006 |
| Riktige Leker AS | Wholesale & retail | 1946 |
| Ringeriksveien 158 AS | Real estate | 2015 |
| Roand AS | Professional & scientific | 2025 |
| Romaeiis AS | Real estate | 2013 |
| Rush Bærum AS | Arts & recreation | 2020 |
| Ruten AS | Real estate | 1989 |
| Røa Elektriske AS | Construction | 2001 |
| Rørlegger Lars AS | Construction | 1993 |
| Samson Transport Nuf | Transport & logistics | 2023 |
| Sanabona AS | Wholesale & retail | 2007 |
| Sans Invest AS | | 2005 |
| Savor Holding AS | Wholesale & retail | 2026 |
| Scan Polymer AS | Wholesale & retail | 2006 |
| Scandinavian Taste AS | Wholesale & retail | 2020 |
| Sea Supply Service AS | Wholesale & retail | 2025 |
| Sebra Light AS | Wholesale & retail | 1985 |
| Secura Assets Management AS | Wholesale & retail | 2000 |
| Servex BPM AS | Other services | 2009 |
| SHP Invest AS | | 2019 |
| Siwa II AS | | 2025 |
| Skou Invest AS | Professional & scientific | 2005 |
| Smarte Hoder AS | Administrative & support | 2021 |
| Snan Holding AS | | 2020 |
| Sognsveien 2 AS | Real estate | 1974 |
| Solanza AS | | 2026 |
| Sondre Invest AS | Wholesale & retail | 1989 |
| Spareblikk AS | Professional & scientific | 2025 |
| Sportnor AS | Wholesale & retail | 2005 |
| Sprell AS | Wholesale & retail | 2016 |
| Sprell Butikk AS | Wholesale & retail | 2014 |
| ST. Hanshaugen Boligeiendom AS | Real estate | 2016 |
| Stall Alta Mira AS | Agriculture & fishing | 2008 |
| Stetina Invest AS | Real estate | 1998 |
| Storygap AS | Professional & scientific | 2025 |
| Sun Seat AS | Wholesale & retail | 2019 |
| Surfacebarrier AS | Manufacturing | 2023 |
| Swart AS | | 2018 |
| Sykehusveien AS | Real estate | 2016 |
| Telemark Naturstein AS | Mining & quarrying | 2016 |
| Tellur Norge AS | Information & communication | 2014 |
| TGC AS | Professional & scientific | 2020 |
| The Good Food AS | Hospitality | 2025 |
| Theas Bærum AS | Education | 1998 |
| Theas Holding AS | Education | 2017 |
| Theis AS | Professional & scientific | 2009 |
| Thomas Schou Holding AS | Real estate | 2007 |