| Compinn AS | Mathopen | 2025 |
| Complete Training AS | Oslo | 2018 |
| Complete Vekter Skolen AS | Vinterbro | 2021 |
| Concentio AS | Billingstad | 1998 |
| Connect Spirit AS | Oslo | 2024 |
| Connect Trafikkskole AS | Oslo | 2024 |
| Connecting AS | Hauglandshella | 2023 |
| Connoisseur AS | Oslo | 2012 |
| Conscious Living AS | Oslo | 2019 |
| Content Marketing Norge AS | Oslo | 2014 |
| Coopreneur AS | Kristiansand S | 2021 |
| Coptersafety Norway AS | Oslo | 2026 |
| Cora Pilates AS | Trondheim | 2025 |
| Corazón Latino AS | Moss | 2024 |
| Core Academy AS | Halden | 2025 |
| Corebar AS | Hamar | 2020 |
| Coremon AS | Svartskog | 2006 |
| Coreskills AS | Ål | 2025 |
| Corespace AS | Moss | 2025 |
| Corporis AS | Oslo | 2018 |
| Cosmic Play AS | Gjettum | 2019 |
| Cosmo International Football Academy AS | Øyer | 2018 |
| Cosmèticos Academy AS | Sandefjord | 2019 |
| Cosy Life AS | Hønefoss | 2020 |
| Cousins HQ AS | Oslo | 2019 |
| Coventina AS | Malvik | 2016 |
| Crazy Legs AS | Lillestrøm | 2022 |
| CRE8 Gründerhus SA | Bjørndalstræ | 2018 |
| Create - Lillehammer Kreative Videregående Skole AS | Lillehammer | 2018 |
| Creation AS | Jessheim | 2019 |
| Creativity, Culture and Education (Cce) | Gb- Newcastle Upon Tyne Ne2 1Qq | 2018 |
| Creator AS | Trondheim | 2005 |
| Credo Kompetansesenter AS | Oslo | 2020 |
| Crescendo Musikk Nuf | Moss | 2013 |
| Crew Training AS | Oslo | 2020 |
| Crewlink Ireland Ltd | Bray Co Wicklow | 2013 |
| Crimp AS | Ålesund | 2016 |
| Cristin Trafikkskole AS | Askim | 2018 |
| Cristina Santos Renhold AS | Brøttum | 2026 |
| Crivo Global AS | Oslo | 2023 |
| Cross Trafikkskole AS | Arendal | 2025 |
| Cross-Cultural Competence AS | Bergen | 2018 |
| Crossfit Kongsberg AS | Kongsberg | 2023 |
| Crossfit Lilleaker AS | Lysaker | 2024 |
| Crossfit Lillestrøm AS | Fjellhamar | 2016 |
| Crossfit Sagene AS | Oslo | 2018 |
| Crossfit Verftet Løftefjosen AS | Nedre Vats | 2026 |
| Crossfit Verftet Minde AS | Bergen | 2023 |
| Crosstraining Drøbak SA | Drøbak | 2017 |
| Cruise Trafikkskole AS | Kristiansand S | 2023 |
| Crux Kompetanse AS | Harstad | 2019 |
| CS Trafikkskole AS | Fjellstrand | 2022 |
| Culinarisservice AS | Trondheim | 2025 |
| Culturas AS | Oslo | 2012 |
| Culture Caddy AS | Oslo | 2024 |
| Cum-Cura AS | Tistedal | 2011 |
| Curlinggutta Ans | Asker | 2002 |
| Cursus AS | Oslo | 2012 |
| CWC School for Energy Ltd | Sw11 3Rb London | 2010 |
| CXS Growth AS | Mjøndalen | 2016 |
| D'Angeli AS | Sande I Vestfold | 2017 |
| D.M.Coaching Da | Søreidgrend | 2023 |
| D2 Invest AS | Lillestrøm | 2021 |
| Dahl Sjakk AS | Stjørdal | 2024 |
| Dahl Trafikkskole AS | Fredrikstad | 2017 |
| Dahlen Kompetanse AS | Brumunddal | 2023 |
| Dahlenmyhr Eiendom AS | Skatval | 2014 |
| Dahlenmyhr Holding AS | Skatval | 2014 |
| Dako Holding AS | Nordre Toten | 2014 |
| Dale Oen Aktiv AS | Rong | 2012 |
| Dalen Familiebarnehage AS | Tromsdalen | 2023 |
| Dalen Fus Friluftsbarnehage AS | Stord | 2018 |
| Daljoti Yoga AS | Husøysund | 2013 |
| Dalpro Utvikling AS | Melandsjø | 2020 |
| Dalsbråten Barnehage SA | Hønefoss | 1989 |
| Dalsbygda Friskole AS | Os I Østerdalen | 2021 |
| Dalsgrenda Montessoriskole SA | Dalsgrenda | 2010 |
| Dalsletta Barnehage SA | Harstad | 1989 |
| Dalstunet Foreldrelagsbarnehage SA | Langhus | 2005 |
| Damaris Norge AS | Kristiansand S | 2008 |
| Damgården AS | Larvik | 2017 |
| Dammyr Invest AS | Bjørnemyr | 2014 |
| Damplassen Barnehage SA | Oslo | 1989 |
| Dampsaga Barnehage AS | Kongsberg | 2005 |
| Dan Holding AS | Kristiansund N | 2005 |
| Dan Johansen Trafikkskole AS | Tromsdalen | 2017 |
| Danbolt Da | Lørenskog | 1999 |
| Dance Events AS | Oslo | 2020 |
| Danceminute AS | Oslo | 2025 |
| Dancemore AS | Oslo | 2022 |
| Dancify AS | Oslo | 2018 |
| Dandèlia AS | Skjolden | 2016 |
| Dangerous Goods Management Midt AS | Stjørdal | 2006 |
| Dangerous Goods Management Oslo AS | Gardermoen | 2001 |
| Danieiendom AS | Ålesund | 2020 |
| Danielsen Barneskole Åsane AS | Bergen | 2025 |
| Danielsen Ungdomsskole Haugalandet AS | Karmsund | 2011 |
| Danielsen Ungdomsskole Karmøy AS | Veavågen | 2012 |
| Danielsen Ungdomsskule Frekhaug AS | Frekhaug | 2011 |
| Danielsen Ungdomsskule Osterøy AS | Valestrandsfossen | 2010 |