| Octavia AS | Professional & scientific | 2023 |
| Odal Bil AS | Other services | 2009 |
| Odal Bil Eiendom AS | Real estate | 2012 |
| Odal Eiendomsutvikling AS | Real estate | 2001 |
| Odal Entreprenør AS | Administrative & support | 2009 |
| Odal Flomsikringslag SA | Real estate | 1968 |
| Odal Fysioterapi Da | Health & social care | 2023 |
| Odal Grus AS | Mining & quarrying | 2002 |
| Odal Maling Og Vedlikehold AS | Wholesale & retail | 2011 |
| Odalen Holdco AS | | 2025 |
| Odalr Eiendom AS | Real estate | 2021 |
| Odals Innkjøpslag SA | Wholesale & retail | 1984 |
| Odalsportalen.No AS | Information & communication | 2026 |
| Odvar Bråthen Rørleggerforretning AS | Construction | 1970 |
| Omberg Holding AS | | 2025 |
| Oppstad Gårds- Og Naturbarnehage SA | Education | 2010 |
| Oppstad Og Ullern Utmarkslag SA | Wholesale & retail | 2012 |
| Oppstad Samfunnshus SA | Real estate | 2001 |
| Oskopne AS | | 2023 |
| Oslo Byggmester Service Drift AS | Construction | 2023 |
| Otto Essentials Oils AS | Education | 2021 |
| Otto Veflen Maskinentreprenør AS | Administrative & support | 1969 |
| Paragon Praedium AS | Real estate | 2024 |
| Parken Bok Og Leker AS | Wholesale & retail | 2019 |
| Parken Legesenter Skarnes AS | Health & social care | 2018 |
| Paulsbråten Consult AS | Professional & scientific | 2022 |
| Per-Kristian Bråthen Transport AS | Transport & logistics | 2004 |
| Pollux Helse AS | Health & social care | 2005 |
| Potten Skarnes AS | Wholesale & retail | 1989 |
| Ra-Con AS | Professional & scientific | 2023 |
| Ranus Agentur Ans | Wholesale & retail | 1990 |
| Ravik AS | Transport & logistics | 2015 |
| Ravik Bil AS | Wholesale & retail | 2013 |
| Roar Bråthen AS | Construction | 1989 |
| Roegården AS | Real estate | 2003 |
| Roger Gaustad AS | Professional & scientific | 2026 |
| Rolf Døli Eiendom AS | Real estate | 2009 |
| Rolf Døli Holding AS | Construction | 2005 |
| Romerike Consult & Mesterbedrift AS | Construction | 2012 |
| Rune Amundsen AS | Wholesale & retail | 1998 |
| Rwpower AS | Professional & scientific | 2009 |
| Rolf Døli A/S | Construction | 1988 |
| Salong 25 AS | Other services | 2022 |
| Sanco Eiendom AS | Real estate | 2009 |
| Sanngrund AS | Hospitality | 1996 |
| Semka AS | Real estate | 1992 |
| Sentrum Legekontor Skarnes AS | Health & social care | 2024 |
| Sentrumsgården AS | Real estate | 1986 |
| Sergas Gruppen AS | Wholesale & retail | 2014 |
| Service Telefonen AS | Administrative & support | 2005 |
| Silovegen 20 Seksjon 5 AS | Real estate | 2023 |
| Sjøli Taxi - Alltid Kjørbar. | Transport & logistics | 2013 |
| Skadedyrbekjemperen AS | Administrative & support | 2021 |
| Skarnes Akupunkturklinikk AS | Health & social care | 2021 |
| Skarnes Autocenter AS | Wholesale & retail | 1997 |
| Skarnes Bil Og Maskinservice Ans | | 1978 |
| Skarnes Bingo AS | Arts & recreation | 2024 |
| Skarnes Flis Og Maleservice AS | Construction | 2015 |
| Skarnes Hagesenter AS | Agriculture & fishing | 1997 |
| Skarnes Hagesenter Utleiebygg AS | Real estate | 2013 |
| Skarnes Invest AS | Real estate | 2012 |
| Skarnes Jernvare AS | Wholesale & retail | 1985 |
| Skarnes Næringspark AS | Real estate | 2008 |
| Skarnes Optiske AS | Wholesale & retail | 1991 |
| Skarnes Tannhelsesenter AS | Health & social care | 2023 |
| Skarnes Taxisentral SA | Transport & logistics | 2014 |
| Skeno AS | Professional & scientific | 2014 |
| Sky Transport AS | Transport & logistics | 2025 |
| Skårer Invest AS | Real estate | 2025 |
| Slobrua Gjestegård AS | Hospitality | 2018 |
| Slomarka 25 AS | Real estate | 2021 |
| Slomarka 57 AS | Real estate | 2016 |
| Slomarka 57 Holding AS | Real estate | 2021 |
| Slomarka Eiendom AS | Real estate | 2009 |
| Slomarka Lager & Logistikk AS | Transport & logistics | 2021 |
| Slomarka Lagerbygg AS | Real estate | 2026 |
| Slåstad Samfunnshus SA | Real estate | 2013 |
| Småbåthavner AS | Construction | 2001 |
| Sol-Link AS | Wholesale & retail | 2023 |
| Sollink Norge AS | Wholesale & retail | 2025 |
| Spigseth AS | Professional & scientific | 2019 |
| Spinner Records AS | Information & communication | 1992 |
| Sportica Skarnes AS | Arts & recreation | 2012 |
| Stasjonsdrift Heimdal AS | Wholesale & retail | 2020 |
| Steinerud Gård Ans | Agriculture & fishing | 2004 |
| Stewart AS | | 2022 |
| Studio SG AS | Other services | 2022 |
| Sudus Holding AS | Financial services | 2009 |
| Sykepleieklinikken Skarnes AS | Other services | 2012 |
| Skarnes Sport A/S | Wholesale & retail | 1988 |
| Søndre Odal Bygg AS | Construction | 2023 |
| Sør Odal Utleie Og Slamtømming AS | Administrative & support | 2021 |
| T. Haug Eiendom AS | Real estate | 2015 |
| Taho Eiendom AS | Real estate | 2026 |
| Take Control AS | Information & communication | 2015 |
| Tannlege Kaja Bangen Melstrøm AS | Health & social care | 2021 |
| Tannlege Tone Strand AS | Health & social care | 2017 |
| Tannådalsveien SA | Real estate | 1951 |
| Terra Life AS | Education | 2023 |
| Tett På Alt AS | Real estate | 2021 |