| Cilag GmbH International | 6300 Zug | 2013 |
| Cili by Design Europe Ltd B.V. | 2289Da Rijswijk | 2025 |
| Cim Consult Scandinavia AS | Porsgrunn | 2002 |
| Cim Consult Solution AS | Porsgrunn | 2002 |
| Cimberio AS | Hagan | 1991 |
| Cimberio Eiendom AS | Hagan | 2024 |
| Cimpress Schweiz GmbH | Ch-8001 Zurich | 2025 |
| Cimri AS | Oslo | 2025 |
| Cinderella Baby Ans | Åkrehamn | 1995 |
| Cinderella Capital AS | Oslo | 2020 |
| Cinema-Shop.No | Dk-4180 Sorø | 2013 |
| Cinesuit AS | Oslo | 2023 |
| Cinetek.No AS | Oslo | 2020 |
| Cinett AS | Sandnessjøen | 2005 |
| Cingulum AS | Stordal | 2020 |
| Cinto AS | Oslo | 2020 |
| Cinéography AS | Stavanger | 2026 |
| Ciol AS | Ås | 2022 |
| Cirak Demirel AS | Solbergelva | 2026 |
| Ciratech AS | Ålesund | 2016 |
| Circius Pharma AS | Askim | 2021 |
| Circle K AS | Oslo | 2010 |
| Circle K Bølerlia AS | Oslo | 2022 |
| Circle K Detaljist AS | Oslo | 1994 |
| Circle K Energy Trading SA | Ch-1201 Geneve | 2022 |
| Circle K Icc AB | Oslo | 2000 |
| Circle K Norge AS | Oslo | 1920 |
| Circle Trading Import-Export Da | Oslo | 1990 |
| Circular Boating AS | Heggedal | 2023 |
| Circularnow Limited | Ie-Limerick V94 Fd80 | 2025 |
| Circum AS | Verdal | 2016 |
| Circumpoint AS | Oslo | 2012 |
| Circus Rasmussen Holding AS | Fitjar | 2023 |
| Cirkle a AS | Ski | 2017 |
| Cirkulær AS | Oslo | 2023 |
| Cirkulær Holding AS | Oslo | 2023 |
| Cirkum AS | Skotterud | 2020 |
| Ciro Namsos AS | Namsos | 2009 |
| Cisa Nordic AS | Gjerdrum | 2025 |
| Cisco Systems (Sweden) AB | 10074 Stockholm | 2010 |
| Cisi Systems Nuf | Rælingen | 2025 |
| Ciska AS | Oslo | 2005 |
| Ciszere AB | Se-504 33 Borås | 2023 |
| Citec AB | Oslo | 2011 |
| Citius Data AS | Søreidgrend | 2007 |
| Citius Kayaks AS | Staubø | 2018 |
| Citnow Group Norway | Wokingham Berkshire Rg41 2Ad | 2025 |
| Citra Invest AS | Arendal | 2017 |
| City Asiamat AS | Skien | 2020 |
| City Bil Skien AS | Skien | 2016 |
| City Clothing Ans | Oslo | 1996 |
| City Farger AS | Drøbak | 1988 |
| City Food AS | Oslo | 2008 |
| City Fresh AS | Askim | 2025 |
| City Garn AS | Porsgrunn | 2024 |
| City Import AS | Oslo | 2014 |
| City Lager Og Parkering AS | Ålesund | 1988 |
| City Market Central AS | Trondheim | 2026 |
| City Mart AS | Oslo | 2026 |
| City Mote AS | Lillestrøm | 1996 |
| City Møbler AS | Drøbak | 1998 |
| City Møbler Moss AS | Moss | 2025 |
| City Outlet AS | Kleppe | 2018 |
| City Parfymeri & Hudpleieklinikk AS | Levanger | 2015 |
| City Partners AS | Ranheim | 2012 |
| City Sales Ans | Oslo | 1995 |
| City Veiservice V2 AS | Kautokeino | 2025 |
| Cityboii AS | Eidsvåg I Åsane | 2023 |
| Cityswip AS | Oslo | 2014 |
| Civ. Ing. Helge Ingeberg AS | Lierskogen | 1996 |
| Civa AS | Eidsvåg I Romsdal | 2004 |
| CJ Equestrian AS | Nittedal | 2023 |
| CJ Wildbird Foods Europe B.V | 5821Ee Vierlingsbeek | 2021 |
| Cjls AS | Bergen | 2015 |
| CK Auto AS | Drammen | 2024 |
| CK Gruppen AS | Son | 2014 |
| CK Interiør AS | Drammen | 2001 |
| CK Produkter AS | Ørskog | 2019 |
| CK Trading AS | Setskog | 2019 |
| Ck-Teknikk Norway | 7200 Grindsted | 2015 |
| CKT Elektro AS | Vadsø | 2021 |
| Cku Byporten AS | Oslo | 2023 |
| Claire by Fjand-Tex Norge AS | Fornebu | 1984 |
| Claire Kids AS | Karmsund | 2022 |
| Claj Holding AS | Skien | 2018 |
| Clan AS | Lillehammer | 2017 |
| Clano AS | Manstad | 2019 |
| Clanor AS | Drammen | 2006 |
| Clar Wine | Se-22468 Lund | 2023 |
| Clara AS | Oslo | 2021 |
| Clara Lumiere AS | Hommelvik | 2025 |
| Claras AS | Hokksund | 2018 |
| Clariant Distribution UK Ltd | Ls19 7Ba Yeadon Leeds Emgland | 2010 |
| Clariant International AG | Bergen | 2007 |
| Clariant Nordic Countries AB | 431 37 Mølndal | 1995 |
| Clariant Oil Services Scandinavia AS | Bergen | 1957 |
| Clariant Production Sweden AB Nuf | Se-431 35 Mølndal | 2019 |
| Clariant Produkte (Deutschland) GmbH | 65929 Frankfurt Em Main | 2010 |
| Clariant SE | De-65929 Frankfurt Am Main | 2010 |
| Clarios Germany GmbH & Co KG | De-30419 Hannover | 2007 |