| Nøtholmen Resort 1 AS | Real estate | 2005 |
| Nøtholmen Resort 2 AS | Households | 2005 |
| Oddmund Sletten Holding AS | Professional & scientific | 2014 |
| Olivia Holding AS | | 2026 |
| On Holding AS | Professional & scientific | 2022 |
| Opportunity Investments AS | Professional & scientific | 2025 |
| Organisasjonspsykolog Jon E. Jacobsen AS | Professional & scientific | 2011 |
| P Bilutleie AS | Wholesale & retail | 2026 |
| P. Andersen Kobber & Blikk AS | Construction | 2005 |
| Panduro Hobby AS | Wholesale & retail | 1977 |
| Paninigruppen AS | Wholesale & retail | 2018 |
| Pater Noster AS | | 2018 |
| Pekran AS | Financial services | 2023 |
| Pelitar AS | | 2019 |
| Pellips AS | Professional & scientific | 2025 |
| Pellips Law Advokatfirma AS | Professional & scientific | 2023 |
| Pellygata 43 AS | Real estate | 2021 |
| Penford AS | Real estate | 2005 |
| Pentz AS | Professional & scientific | 2022 |
| Pesec Global AS | Professional & scientific | 2017 |
| Pettersen & Pinderød Eiendom AS | Real estate | 2020 |
| Pettersen & Pinderød Holding AS | Real estate | 2020 |
| Pettersen & Pinderød Miljø AS | Water & waste | 1995 |
| Pettersen Invest AS | Wholesale & retail | 2005 |
| Pidell AS | Professional & scientific | 2000 |
| Plankebyen Legesenter AS | Health & social care | 2007 |
| Playnor Da | Wholesale & retail | 2000 |
| Plexx AS | Manufacturing | 1999 |
| Pluss Invest Eiendom AS | Real estate | 2007 |
| Pneumologisk Service Sabine Sandweg AS | Health & social care | 2025 |
| Poppenstreet AS | | 2023 |
| Presangen Gavesenter AS | Wholesale & retail | 1979 |
| Presisjon Eiendomsmegling AS | Real estate | 2009 |
| Prime Group AS | Professional & scientific | 2019 |
| Priorat AS | Real estate | 2006 |
| Prosjektlederen AS | Professional & scientific | 2022 |
| Putten Vann Og Avløp SA | Water & waste | 2012 |
| På Tide AS | Wholesale & retail | 2011 |
| Quality Security AS | Administrative & support | 2004 |
| Quattro Holding AS | Financial services | 2005 |
| Rabagast Invest AS | | 2009 |
| Racing AS | Education | 2024 |
| Ragnar Englund Consulting AS | Professional & scientific | 2008 |
| Ragoon AS | Professional & scientific | 2013 |
| Ramen AS | Wholesale & retail | 2023 |
| Ravn AS | Real estate | 2007 |
| RDK Invest AS | Financial services | 2008 |
| Reforhandle AS | Administrative & support | 2026 |
| Renere-Vann AS | Water & waste | 2022 |
| Residence Holding AS | Real estate | 2005 |
| Restauranthuset Slippen AS | Hospitality | 2012 |
| Rett Kurve AS | Real estate | 1993 |
| Ring Backer AS | Administrative & support | 1993 |
| Risholmsundet Vann- Og Avløpslag SA | Water & waste | 2010 |
| Rke Eiendomsutvikling AS | Real estate | 2021 |
| Rohdos Records Da | Information & communication | 2019 |
| Romundset Holding AS | Professional & scientific | 2022 |
| RS1 Holding AS | Manufacturing | 2022 |
| Runeøsthagen Id AS | Professional & scientific | 2017 |
| Røby AS | Real estate | 2021 |
| Rød Gård Eiendom AS | Real estate | 2022 |
| Rødsveien Eiendom AS | Real estate | 2022 |
| Rødsveien Utvikling AS | Real estate | 2024 |
| Røed Transport AS | Transport & logistics | 1999 |
| S Berntsen AS | | 2026 |
| Sabb Holding AS | Real estate | 2022 |
| Sabrura Værstetorvet AS | Hospitality | 2024 |
| Saftig Burger AS | Hospitality | 2025 |
| SAG1 Invest AS | | 2020 |
| Saga Estate AS | Real estate | 2025 |
| Sagplass Tex AS | Wholesale & retail | 2002 |
| Salgtjenester Rosenqvist Nuf | Professional & scientific | 2021 |
| Santè AS | Wholesale & retail | 2007 |
| Sapro AS | Real estate | 2018 |
| Sarah Tharaldsen AS | Wholesale & retail | 2025 |
| Saunasamurai AS | Wholesale & retail | 2025 |
| Scala Consulting AS | Professional & scientific | 2010 |
| Scanditech Solutions AS | Information & communication | 2024 |
| Schou Isenkram AS | Wholesale & retail | 2000 |
| Seaport AS | Wholesale & retail | 1987 |
| SGD Eiendom AS | Real estate | 2016 |
| SGD Holding AS | Education | 2015 |
| Shopfix AS | Information & communication | 2022 |
| Significa AS | Professional & scientific | 2017 |
| Siljeholmen Da | Real estate | 2005 |
| Simfro Eiendom Da | Real estate | 1999 |
| Simfro Holding AS | Real estate | 2006 |
| Simfro Holding AS | | 2026 |
| Simler AS | Manufacturing | 2023 |
| Siv.Ing. F.M. Haaland AS | Professional & scientific | 2019 |
| Sjutom AS | Real estate | 2020 |
| SJØ1 AS | | 2025 |
| Sjøkanten Consulting AS | Professional & scientific | 2023 |
| Sjøtjenester AS | Construction | 2022 |
| Sjøtjenester Eiendom AS | Construction | 2011 |
| SK Paulsen Transport AS | Transport & logistics | 2024 |
| Skaarberg Eiendom AS | Real estate | 2009 |
| Skifer Invest AS | Real estate | 2011 |
| Skjærgården Rør AS | Construction | 2024 |
| Skolding AS | | 2023 |