| Collett & Co. AS | Professional & scientific | 1999 |
| Collett AS | Administrative & support | 2019 |
| Collett Invest AS | Administrative & support | 2014 |
| Collett Skog AS | | 2025 |
| Collette AS | Real estate | 2021 |
| Collettløkka Barnehage SA | Education | 1999 |
| Collettmüller Invest AS | | 2021 |
| Colletts Gate 33 AS | Real estate | 2006 |
| Colletts Gate 33 Invest AS | Real estate | 2021 |
| Colletts Parkservering AS | Hospitality | 2026 |
| Colliers Debt Advisory AS | Professional & scientific | 2021 |
| Colliers Norway AS | Financial services | 2009 |
| Colliers Project Finance AS | Financial services | 2020 |
| Colliers Valuation & Advisory AS | Professional & scientific | 2024 |
| Colline Invest AS | | 2024 |
| Collings Productions AS | Information & communication | 2013 |
| Collis AS | | 2022 |
| Collixl AS | Professional & scientific | 2025 |
| Colly Components AS | Wholesale & retail | 2005 |
| Colmer AS | Information & communication | 2022 |
| Colo AS | Professional & scientific | 2019 |
| Colonial Invest Ans | | 1993 |
| Colonklinikken Tveitan AS | Health & social care | 2019 |
| Colonthree Enterprises AS | Information & communication | 2013 |
| Coloplast Norge AS | Wholesale & retail | 1981 |
| Color Clean Portillo AS | Administrative & support | 2025 |
| Color Festivals Norway AS | Arts & recreation | 2019 |
| Color Group AS | Transport & logistics | 1990 |
| Color Hotels AS | Hospitality | 1998 |
| Color Line AS | Transport & logistics | 1994 |
| Color Line Crew AS | Transport & logistics | 2007 |
| Color Line Cruises AS | Transport & logistics | 2007 |
| Color Line Transport AS | Transport & logistics | 2007 |
| Color Scandi Line AS | Transport & logistics | 2005 |
| Color Shop Ans | Transport & logistics | 2000 |
| Color to the People AS | Wholesale & retail | 2017 |
| Color United Maler AS | Transport & logistics | 2022 |
| COLOR4CARE Nuf | Wholesale & retail | 2013 |
| Colorflow AS | Professional & scientific | 2026 |
| Colorizethis AS | Information & communication | 2016 |
| Colorspace AS | Arts & recreation | 2023 |
| Colosseum AS | Real estate | 1969 |
| Colosseum Dental Group Holding AS | Health & social care | 2017 |
| Colosseum Eiendom Ans | Real estate | 1991 |
| Colosseum Frisør AS | Other services | 2003 |
| Colosseum Helse Og Handel AS | Real estate | 2023 |
| Colosseum Kino Eiendom AS | Real estate | 2002 |
| Colosseum Medispa AS | Other services | 1998 |
| Colosseum Park Syd AS | Real estate | 2011 |
| Colosseum Property AS | Real estate | 2008 |
| Colosseum Renseri AS | Other services | 2025 |
| Colosseum Øyelegesenter AS | Health & social care | 2002 |
| Colosseumklinikken Allmennseksjonen AS | Health & social care | 2001 |
| Colosseumklinikken AS | Health & social care | 1996 |
| Colosseumklinikken Medisinske Senter AS | Health & social care | 2014 |
| Colour in Architecture Da | Administrative & support | 2000 |
| Colseth AS | Wholesale & retail | 1994 |
| Colt Technology Services Norway AS | Information & communication | 1999 |
| Coltux Holding AS | Real estate | 2005 |
| Columbi Farms AS | Professional & scientific | 2020 |
| Columbia Sportswear Norway AS | Wholesale & retail | 2011 |
| Columbus Consulting AS | Health & social care | 1997 |
| Columbus Eiendom AS | Real estate | 1995 |
| Columbus Norway AS | Information & communication | 2001 |
| Columbus Regnskap-Invest AS | Professional & scientific | 2015 |
| Com Holding AS | | 2021 |
| COM2ACT AS | Professional & scientific | 1997 |
| COM4 AS | Information & communication | 2011 |
| Coma Industrier AS | Real estate | 2006 |
| Combat Corner Norge AS | Wholesale & retail | 2013 |
| Combat Store AS | Wholesale & retail | 2025 |
| Combi Rent AS | Administrative & support | 2015 |
| Combino AS | | 2017 |
| Combinor AS | Professional & scientific | 2021 |
| Combisafe Norge AS | Wholesale & retail | 2004 |
| Combra Invest AS | | 2023 |
| Comcept AS | Information & communication | 2019 |
| Comeback AS | Health & social care | 2022 |
| Comediemaskinen AS | Professional & scientific | 1983 |
| Comedor Ltd Nuf | Hospitality | 2011 |
| Comelli AS | | 2025 |
| Comet Consular Services AS | Administrative & support | 2009 |
| Cometa AS | Information & communication | 2026 |
| Comfort Bryn AS | Construction | 2002 |
| Comfort Drive AS | Transport & logistics | 2023 |
| Comfort Elektro AS | Construction | 1980 |
| Comfort Hotel Børsparken AS | Hospitality | 1995 |
| Comfort Storo AS | Construction | 2002 |
| Comfort-Kjeden AS | Administrative & support | 1979 |
| Comfortbutikken Skøyen AS | Wholesale & retail | 1992 |
| Comfycom AS | Information & communication | 2023 |
| Comic International Norway AS | Wholesale & retail | 1999 |
| Comiena AS | Professional & scientific | 2009 |
| Commander AS | | 2020 |
| Commando Da | Information & communication | 2013 |
| Commenda AS | Professional & scientific | 2005 |
| Commendatio AS | Professional & scientific | 2019 |
| Commerce AS | Professional & scientific | 2001 |
| Commercial Banking Applications AS | Information & communication | 1983 |
| Commercial Data Servers AS | Wholesale & retail | 1997 |