| Nybergs Holding AS | | 2026 |
| Nysæther Holding AS | Financial services | 2006 |
| Odenta AS | Health & social care | 2025 |
| Oks Eiendom AS | Real estate | 2004 |
| Ole Ivars Bilberging AS | Transport & logistics | 2025 |
| Olsen Rørleggerservice AS | Construction | 2021 |
| Oncogene AS | Professional & scientific | 2020 |
| Oseberg Capital AS | Financial services | 2010 |
| Oslo Brannteknikk AS | Construction | 2025 |
| Oslo Gipsforum AS | Manufacturing | 1996 |
| Osnes Holding AS | Manufacturing | 2005 |
| Out for a Hero Holding AS | Information & communication | 2020 |
| Panda Invest & Services AS | Administrative & support | 2018 |
| Pavitra AS | | 2022 |
| Pedersens Glasservice Romerike AS | | 2026 |
| Peer-Oscar Herudsløkken AS | Wholesale & retail | 2013 |
| Per Hoff AS | Professional & scientific | 2008 |
| Perfect Renhold Da | Administrative & support | 2007 |
| Pervaco AS | Wholesale & retail | 1973 |
| Pharmalogic Norway AS | | 2025 |
| Polar Øst AS | Wholesale & retail | 2014 |
| Polimac Bygg AS | Construction | 2025 |
| Polygon Communications AS | Wholesale & retail | 2012 |
| Prima Bilservice AS | Other services | 2018 |
| Print-Link Nuf | Professional & scientific | 2010 |
| Pro Ekspress AS | Transport & logistics | 2024 |
| Pro Montasje AS | Construction | 2024 |
| Pro-Dent Lab AS | Manufacturing | 2015 |
| PRS Bygg AS | Construction | 2022 |
| Pure Fishing Norway AS | Wholesale & retail | 1971 |
| PVR Transport AS | Transport & logistics | 2021 |
| Quist AS | | 2021 |
| Reservekraft AS | Wholesale & retail | 2021 |
| Revs AS | Transport & logistics | 2023 |
| Reynir Virtual AS | Information & communication | 2025 |
| Riis Gartneri AS | Agriculture & fishing | 2014 |
| Riis Invest AS | Real estate | 2014 |
| RIIS16 Holding AS | | 2020 |
| Ringøen Baller Holding AS | | 2025 |
| Rixon Holding AS | | 2019 |
| Rob Ram AS | Construction | 2025 |
| Robert Søderberg Byggservice AS | Construction | 2009 |
| Roll Advice AS | Professional & scientific | 2026 |
| Romerike Bruktbil AS | Wholesale & retail | 2019 |
| Romerike Eiendomsservice AS | Administrative & support | 2018 |
| Runway AS | Real estate | 2012 |
| Ruskesara AS | Real estate | 2015 |
| Rygge 1 AS | Public administration | 2018 |
| Rygge 2 AS | Manufacturing | 2018 |
| Rygge Aerosenter AS | Other services | 2016 |
| Rygge Eiendom AS | Manufacturing | 2018 |
| Rørteft AS | Construction | 1995 |
| Saddique & Sons Holding AS | | 2019 |
| Scandic Romerike AS | Wholesale & retail | 2017 |
| Scandpower Petroleum Technology GmbH | Information & communication | 2008 |
| Schunk Intec AS | Wholesale & retail | 2010 |
| Seismic Innovation AS | Information & communication | 2006 |
| Seksjon 3 Eiendom AS | Real estate | 2008 |
| Sensornordic AS | Wholesale & retail | 2025 |
| Serac Scandinavia Eiendom AS | Real estate | 2013 |
| Serwent Tt-Teknikk AS | Construction | 1986 |
| SH Consulting AS | Professional & scientific | 2016 |
| Shane Ma Butikkdrift AS | Wholesale & retail | 2013 |
| SHR Holding AS | Real estate | 2013 |
| Sievi AS | Wholesale & retail | 2008 |
| Skanditek Entreprenør AS | Construction | 2022 |
| Skarsbø Invest AS | Real estate | 2019 |
| Skedsmo Eiendomsutvikling AS | Real estate | 2000 |
| Skogbygda Utmarkslag SA | Real estate | 1990 |
| Skogrand AS | Information & communication | 2016 |
| Slettli Holding AS | Real estate | 2023 |
| Slø Holding AS | Real estate | 2019 |
| SM Taxi AS | Transport & logistics | 2025 |
| Smartway AS | Transport & logistics | 2026 |
| SN Group AS | | 2025 |
| Snubla Holding AS | Information & communication | 2015 |
| SOL76 AS | Professional & scientific | 2023 |
| Sondre Bye Maskin AS | Construction | 2021 |
| Sonic Invest AS | Financial services | 2018 |
| Spmtb Eiendom AS | | 2025 |
| Spot Eiendomsutvikling AS | Real estate | 2009 |
| Springboard AS | Education | 2019 |
| Stafto Invest AS | Information & communication | 2020 |
| Stasjonsdrift Koxha AS | Wholesale & retail | 2020 |
| Stasjonsdrift Nordvold AS | Wholesale & retail | 2019 |
| Staut IT AS | Information & communication | 2025 |
| Steensnæs Invest AS | Professional & scientific | 2019 |
| Streamserve Norge AS | Information & communication | 1998 |
| Strømsvåg Eiendom AS | Real estate | 2023 |
| Style of Norway AS | Real estate | 2023 |
| Sunn I Farten Da | Wholesale & retail | 2004 |
| Sunphade AS | Professional & scientific | 2017 |
| Superb Renhold & Transport AS | Administrative & support | 2012 |
| Surveyor AS | Professional & scientific | 2026 |
| Sushi-Jentene AS | Hospitality | 2015 |
| Svangen AS | | 2023 |
| Svea Fyrverkerier AS | Wholesale & retail | 1998 |
| Søderberg Eiendom AS | Real estate | 2024 |
| Takstmannringen AS | Professional & scientific | 1993 |
| TB Trading AS | Wholesale & retail | 2018 |