| Prolak AS | Wholesale & retail | 2005 |
| Prosjekt JT AS | Professional & scientific | 2020 |
| Prosjekt Kod AS | Wholesale & retail | 1989 |
| Prosjektbygg AS | Construction | 1991 |
| PS Servicesenter AS | Other services | 2026 |
| Ps:Dans AS | Education | 2013 |
| Psykolog Birgit Valla AS | Health & social care | 2025 |
| Psykolog O. Baardsgaard AS | Health & social care | 2017 |
| PTT Communication AS | Professional & scientific | 2015 |
| Pub Media AS | Arts & recreation | 2021 |
| Publikums Trøst AS | Hospitality | 1994 |
| Puffpeng AS | | 2024 |
| Pulss Consulting AS | | 2018 |
| Purple Vet Services AS | Professional & scientific | 2024 |
| Puttimunn AS | Hospitality | 2022 |
| PXL AS | Information & communication | 2023 |
| Pål Skjæret Holding AS | | 2022 |
| Que Pasa AS | Hospitality | 2025 |
| R&D Nordic AS | Professional & scientific | 2026 |
| R&R Investor AS | | 2022 |
| R-I Invest AS | | 2025 |
| R2 Økonomi AS | Professional & scientific | 2006 |
| Ra Forsikring AS | Financial services | 2020 |
| Raadhuset Consult Da | Wholesale & retail | 2001 |
| Ragnhild Nesbakken Invest AS | | 2019 |
| Rahmanpour Holding AS | Health & social care | 2020 |
| Raidho Games AS | Information & communication | 2021 |
| Randi Labs AS | Information & communication | 2024 |
| Randor AS | Real estate | 2000 |
| Randor Eiendom AS | Real estate | 2000 |
| Raufoss Industripark Vest AS | Professional & scientific | 2021 |
| Ravineveien Eiendom AS | Real estate | 2006 |
| Rc-Deler.No AS | Wholesale & retail | 2015 |
| RCR Research Communicate & Results AS | Professional & scientific | 2003 |
| Re.Fresh Hamar AS | Other services | 2026 |
| Recab Nuf | Wholesale & retail | 2011 |
| Red Ruby International AS | Wholesale & retail | 2018 |
| Reflux Interactive AS | Information & communication | 2018 |
| Regreb Consulting AS | Professional & scientific | 2025 |
| Reneco AS | Professional & scientific | 2011 |
| Renhold Kvalitet AS | Administrative & support | 2022 |
| Renofin AS | Professional & scientific | 2004 |
| Reol Eiendom AS | Real estate | 1993 |
| Residential AS | Real estate | 2011 |
| Resilient Athlete Technologies AS | Information & communication | 2026 |
| Retinaculum AS | | 2013 |
| Retrobakeriet AS | Manufacturing | 2024 |
| Reven I Gata AS | Wholesale & retail | 2014 |
| Revisjonsforum AS | Professional & scientific | 2014 |
| Rewmatch Da | Arts & recreation | 2025 |
| Reza Nogorabi AS | Health & social care | 2005 |
| Rh-Holding AS | Financial services | 2012 |
| Riberg Eiendom AS | Real estate | 2023 |
| Riberg Holding AS | Real estate | 2023 |
| Ridabu Invest AS | Real estate | 2008 |
| Rika Eiendom Hamar AS | Real estate | 2014 |
| Ringgata 65 AS | Real estate | 2025 |
| Riso Holding AS | Real estate | 2021 |
| Ristra Eiendom AS | Real estate | 2021 |
| RMC Utvikling AS | Real estate | 2020 |
| Rollsløkken Helse AS | Health & social care | 2019 |
| Rollsløkken Legetjenester AS | Health & social care | 2024 |
| Roma Brus Og Øl Hamar Da | Wholesale & retail | 2008 |
| Roset Eiendom AS | Real estate | 2013 |
| Rotate AS | Wholesale & retail | 2013 |
| Rss-Index Da | Information & communication | 2006 |
| Rucking AS | Wholesale & retail | 2025 |
| Rui Enterprises AS | Information & communication | 2009 |
| Run AS | Wholesale & retail | 2012 |
| Rush Hamar AS | Arts & recreation | 2018 |
| Rvi AS | Real estate | 2001 |
| Rytterager Holding AS | Professional & scientific | 2014 |
| Rødz Holding AS | | 2022 |
| Røed Invest AS | Hospitality | 2005 |
| Rønvikfjellet Invest AS | Construction | 2013 |
| Rør Og Kjøleservice AS | Construction | 1989 |
| Rørleggern Hamar AS | Construction | 2019 |
| S & G Invest AS | Financial services | 2014 |
| S a M Lift & Påbygg Da | Administrative & support | 1986 |
| S Hervik Invest AS | | 2026 |
| S. Sannerud Eiendom AS | Real estate | 2013 |
| S2CONSULT AS | Professional & scientific | 2014 |
| Sabrura Hamar AS | Hospitality | 2022 |
| Safari Fashion House AS | Wholesale & retail | 1995 |
| Safedays Cryogenics AS | Professional & scientific | 2018 |
| Sagatoon AS | Information & communication | 2011 |
| Sagatoon Ludolf AS | Information & communication | 2021 |
| Salcedo AS | Health & social care | 2025 |
| Salong Gullhår AS | Other services | 1998 |
| Sameiet Just Brochsgate 12 - Hamar | Households | 2004 |
| Samtalerommet AS | Health & social care | 2016 |
| San Marino Hamar AS | Hospitality | 2025 |
| Sandberg Johansen Saxrud Communication Ans | Information & communication | 1999 |
| Sandberg Rådgivning AS | Professional & scientific | 2023 |
| Sandefjord Invest AS | | 2002 |
| Sandvika Eiendom Stange AS | Real estate | 2016 |
| Sandvision AS | Health & social care | 2026 |
| Sandås Eiendomsutvikling AS | Real estate | 2017 |
| Sanglundvegen 3 AS | Real estate | 2016 |
| Sarepta Studio AS | Information & communication | 2010 |