| Cobit Bil AS | Ålesund | 2011 |
| Cocar International AS | Drammen | 2020 |
| Cockpit Event AS | Jessheim | 2016 |
| Cocreate Careers AS | Bergen | 2020 |
| Codework AS | Trondheim | 2016 |
| Coeli Asset Management AB | Nesbru | 2019 |
| Coeo Inkasso AS | Oslo | 2024 |
| Cof Holding AS | Åsmarka | 2012 |
| Coface Norway Services AS | Oslo | 2022 |
| Cognizant Technology Solutions Global Services Ltd | London W2 6Bd England | 2013 |
| Cognizant Technology Solutions India Private Limited | Oslo | 2014 |
| Cohkka AS | Bergsfjord | 2017 |
| Coitio Densification AS | Kokstad | 2023 |
| Coitio Telepower AS | Kokstad | 2022 |
| Cold Water Shipping AS | Kristiansand S | 2018 |
| Colgate-Palmolive (U.K) Limited | Surrey Gu2 8Jz England | 2023 |
| Colibri Events AS | Oslo | 2014 |
| Colibri Helicopter AS | Vestby | 2002 |
| Colioteck AS | Fagernes | 2025 |
| Collectia AS | Lysaker | 2016 |
| Collectia Norge Holding AS | Lysaker | 2019 |
| Collectin AS | Kongsberg | 2022 |
| Collectio AS | Oslo | 2012 |
| Collectit Finans AS | Oslo | 2022 |
| Collective AS | Oslo | 2017 |
| Collective Trust Solutions | 94115 San Francisco California | 2010 |
| Collectors AS | Rennebu | 2020 |
| Collett AS | Oslo | 2019 |
| Collett Invest AS | Oslo | 2014 |
| Colligo Omsorg AS | Vinterbro | 2023 |
| Colligo Vårdkompetens AB Nuf | Se-113 46 Stockholm | 2023 |
| Color Clean Portillo AS | Oslo | 2025 |
| Colour in Architecture Da | Oslo | 2000 |
| Combi Rent AS | Oslo | 2015 |
| Combipro AS | Asker | 2018 |
| Combiunits AS | Eidsvågneset | 2008 |
| Come to Spain Events Slu | 41020 Sevilla | 2009 |
| Comet Consular Services AS | Oslo | 2009 |
| Comet Hockey Drift AS | Halden | 2024 |
| Comfact AB | Se-411 18 Göteborg | 2020 |
| Comfort-Kjeden AS | Oslo | 1979 |
| Comma AS | Horten | 2012 |
| Commando Logistic Regiment, Royal Marines, British Military | Øverbygd | 2024 |
| Commesa AS | Borre | 2026 |
| Commonfund Capital Environmental Sustainability Partners 2020, L.P. | Wilton, Connecticut 06897 | 2022 |
| Community Service AS | Bønes | 2022 |
| Comoretel Holdings Ltd Nuf | Us-68144 Omaha Ne | 2024 |
| Compact Generator AS | Tustna | 2008 |
| Compagnie De Transporters De Cereales | Moss | 1999 |
| Company Event AS | Sandefjord | 2011 |
| Compary AS | Kråkerøy | 2025 |
| Compass Fairs AS | Skedsmokorset | 1996 |
| Compass Human Resources AS | Oslo | 1995 |
| Compax Next AS | Oslo | 2021 |
| Competec UK Ltd | Sunderland Sr6 7Ql | 2018 |
| Competence Hunting AS | Stavanger | 2012 |
| Complete Cleaning AS | Oslo | 2018 |
| Complete Partner Grenland AS | Langesund | 2009 |
| Complete Renhold AS | Oslo | 2021 |
| Complete Security AS | Oslo | 2013 |
| Complete Travels AS | Husøysund | 2018 |
| Complett Vask AS | Tromsdalen | 2021 |
| Compricer AB | 11359 Stockholm | 2005 |
| Concentrix Norway AS | Kråkerøy | 2003 |
| Concentrix Norway Consulting AS | Kråkerøy | 2014 |
| Concept Audio Da | Bærums Verk | 2002 |
| Concept Service AS | Oslo | 2024 |
| Concept Tech AS | Kapp | 2006 |
| Conceptum Conferences & Events | Be-1473 Genappe | 2016 |
| Conco AS | Hagan | 2014 |
| Concord Capital AS | Tiller | 2025 |
| Condor Inspection Limited | North Yorkshire Yo17 8Hx | 2019 |
| Coneco AS | Harstad | 2014 |
| Conecton Da | Oslo | 2010 |
| Coneqt AS | Stavanger | 2019 |
| Conexa AS | Stavanger | 2025 |
| Congress Conference AS | Oslo | 1987 |
| Connect Energy Services Pte Ltd | Singapore 189702 | 2013 |
| Connect Point Limited | Cy-1101 Nicosia | 2013 |
| Connectin AS | Oslo | 2020 |
| Connections AS | Sandefjord | 2007 |
| Connell Finance Company Inc | Berkeley Heights Nj 07922 | 2012 |
| Conoce Noruega AS | Stavanger | 2020 |
| Conocophillips Expatriate Services Company | Stavanger | 2011 |
| Consentra Bygg & Industri AS | Trondheim | 2009 |
| Consentra Helse AS | Trondheim | 2014 |
| Consort Invest AS | Trondheim | 2024 |
| Constellation Global Limited | Wc2H 9Jq London | 2011 |
| Construction and Piling Equipment Holland B.V. | 9411Sb Beilen | 2018 |
| Consub Nuf | Surrey Kt8 9Hf | 2014 |
| Consultant Bemanningsbyrå Og Rekruttering AS | Rykkinn | 2019 |
| Consulting & Bilutleie AS | Hakadal | 2018 |
| Container 1 AS | Skien | 2023 |
| Container Centralen Aps | Dk- 5250 Odense Sv | 2023 |
| Container Norway Utleie AS | Fjellstrand | 1994 |
| Container Solutions AS | Jaren | 2020 |
| Containergruppen Utleie AS | Gjøvik | 2020 |
| Containerlager AS | Råde | 2013 |
| Containerservice AS | Larvik | 1992 |
| Containerservice Ringerike AS | Hønefoss | 2010 |