| Cetex AS | Trøgstad | 2017 |
| Ceva Logistics Ltd | Leichestershire Le65 1Nu | 2015 |
| Ceylon Travel AS | Oslo | 2012 |
| CFC Pyrotechnics AS | Oslo | 2014 |
| CFS Consulting AS | Oslo | 2024 |
| CFS Service Da | Oslo | 2025 |
| CG Drift AS | Bodø | 2007 |
| Cgi Sverige AB | 164 40 Kistad | 2013 |
| CGT Service AS | Sandnes | 2026 |
| CH Shipping HB | Hjellestad | 2000 |
| CH Stadler KFT | Hu-7400 Kaposvar | 2006 |
| CH Utleie AS | Åros | 2026 |
| Chaama AS | Tromsø | 2005 |
| Chaama Maskin AS | Tromsø | 2016 |
| Chainbrium AS | Haugesund | 2023 |
| Chaken AS | Mosterøy | 2018 |
| Chalk Renhold AS | Vinterbro | 2012 |
| Chama Amarela | 2950 255 Pamela | 2015 |
| Chamonix Adventures AS | Oslo | 2017 |
| Champaqui AS | Hjellestad | 2022 |
| Champion Technonogies Europe BV | Aberdeen A815 4Yl | 2010 |
| Champions Travel AS | Kragerø | 2025 |
| Charter Yachts AS | Molde | 2020 |
| Charter-Tur AS | Moss | 2002 |
| Chas.A.Blathchford & Son Ltd | Hants Rg22 4Ah | 2017 |
| Chasing Lights AS | Tromsø | 2015 |
| Chatarina Holmsten Consultancy AB | Se-115 53 Stockholm | 2020 |
| CHC Helicopter Holding (Cayman) Limited | Sola | 2015 |
| CHC Helicopters (Barbados) SRL | Sola | 2015 |
| CHC Leasing S.À.R.L | Lu-1610 Luxembourg | 2019 |
| Cheat Code AS | Kristiansand S | 2025 |
| Check Please AS | Kristiansand S | 2014 |
| CHECK-6 Solutions Limited | London E1W 1Yw England | 2019 |
| Cheeky Studios AS | Oslo | 2017 |
| Cheetah Web Services Ltd | Lillestrøm | 2015 |
| Cheltenham Trading Limited | Essex Rm17 6Bu | 2019 |
| Chem-Dry Norge AS | Straumsgrend | 2015 |
| Chemviron | Be-7181 Seneffe | 2024 |
| Chep Equipment Pooling BV | Be-2800 Mechelen | 2011 |
| CHEP NORWAY Norsk avdeling av utenlandsk foretak NUF | Vestby | 1997 |
| Chepevim SL | Es-46005 Valencia | 2017 |
| Cherry Bay AS | Oslo | 2025 |
| Chestdrop AS | Oslo | 2025 |
| Chevron Australia Pty Ltd | Au-Perth Wa 6000 | 2019 |
| Chevron Global Technology Services Company | San Ramon Ca 94583-2324 | 2019 |
| Chg-Meridian AG | De - 88250 Weingarten | 2010 |
| Chg-Meridian Norway AS | Oslo | 2004 |
| Chill Emotions AS | Lysaker | 2022 |
| Chilly Golf AS | Oslo | 2024 |
| Chitra Nordic AS | Fornebu | 2009 |
| Choi Choi AS | Nord-Lenangen | 2018 |
| Choice-Recruitment AS | Larvik | 2023 |
| Chooose AS | Oslo | 1997 |
| Chop Chop AS | Sandnes | 2025 |
| CHR AS | Oppegård | 1998 |
| CHR. Quartz Lighting AS | Oslo | 2009 |
| Chrinik AS | Nesøya | 2022 |
| Chris Travel Aps | 3500 Værløse | 2003 |
| Chrishann AS | Dalsøyra | 2018 |
| Christensen Maskin & Utleie AS | Manger | 2025 |
| Christian H. Juul Nuf | Lyngdal | 2005 |
| Christian Walan Da | Jessheim | 2010 |
| Christiania Ferjedrift AS | Oslo | 1996 |
| Christiania Flytt & Vask AS | Oslo | 2022 |
| Christiania Forvaltning & Eiendom AS | Oslo | 2018 |
| Christiania Medisinske Senter AS | Oslo | 2009 |
| Christiania Personell AS | Hvalstad | 1998 |
| Christiania Security Da | Oslo | 1999 |
| Christiania Vaktmesterselskab AS | Lillestrøm | 1999 |
| Christiania Vekterselskap Da | Oslo | 1999 |
| Christianssand Marina AS | Kristiansand S | 2019 |
| Christmas Consulting AS | Nesbru | 1980 |
| Christopher W Dodds Landscape AS | Hafrsfjord | 2026 |
| Chrr AS | Lørenskog | 2018 |
| Chrysalis Assets AS | Oslo | 2023 |
| Ci Eiendomsservice AS | Grimstad | 2006 |
| Cibaria AS | Oslo | 2004 |
| CIC Event Congress AS | Oslo | 1995 |
| Ciens Eiendom Hjemmelselskap AS | Oslo | 2005 |
| Cimc Beacon Holding Ltd | Asker | 2022 |
| Cinderella Renhold AS | Oslo | 2020 |
| Cinefile AS | Bergen | 2026 |
| Ciprian Geoconsulting S.R.L. | Ro-700442 Judet Lasi | 2020 |
| Circa Group (Australia) | Au-Victoria 3000 | 2022 |
| Circle K Business Centre | Riga Lv-1013 | 2015 |
| Circle K Business Centre Poland | Pl-02-715 Warszawa | 2018 |
| Circle K Danmark | 0900 København C | 2012 |
| Circle K Estland | Tallinn, Harjumaa 11316 | 2015 |
| Circle K Litauen | Oslo | 2012 |
| Circular-Services AS | Sandnes | 2019 |
| Cirkus Arnardo Eiendomsselskap AS | Brekkestø | 1982 |
| Cit Holding AS | Fedje | 1998 |
| Cit Investment AS | Fedje | 2023 |
| Citadel Americas LLC | 60603 Illinois | 2020 |
| Citero AS | Trondheim | 2016 |
| Citibank N.V. | New York 10043 | 2015 |
| City Bemanning AS | Strømmen | 2016 |
| City Renhold AS | Oslo | 1978 |
| City Security AS | Oslo | 2010 |
| City Security Group AS | Kokstad | 2013 |