| Clarion Hotel Tyholmen AS | Arendal | 1988 |
| Class Restaurant AS | Randaberg | 2024 |
| Classic Bar & Lounge AS | Oslo | 2018 |
| Classic Bar AS | Mo I Rana | 2012 |
| Classic Norway Drift AS | Molde | 2013 |
| Classic Norway Holding AS | Molde | 2021 |
| Classic Pizza AS | Røyken | 1999 |
| Cleo-Lunchbar Ans | Fosnavåg | 2008 |
| Cleopatra's House AS | Oslo | 2023 |
| Click and Stay AS | Kristiansand S | 2026 |
| Clint AS | Hønefoss | 2024 |
| CLP Restaurant Og Bardrift AS | Oslo | 2026 |
| Club Holiday AS | Oslo | 2020 |
| Club Håkon AS | Bergen | 2024 |
| Club Paparazzi Da | Bergen | 1999 |
| Club Partner AS | Haugesund | 2004 |
| Cma Eiendom AS | Vinterbro | 2008 |
| Cma Invest AS | Vinterbro | 2005 |
| Co Co AS | Frogner | 2025 |
| Co Drift AS | Nedgården | 2017 |
| Coastline Rentals AS | Hosle | 2022 |
| Coban AS | Arendal | 2024 |
| Cobee Brumunddal AS | Brumunddal | 2023 |
| Cobee Restaurant & Bar AS | Moelv | 2020 |
| Cobra Låven AS | Oppdal | 2012 |
| Cochs Pensjonat AS | Oslo | 1985 |
| Cockney AS | Oslo | 2001 |
| Cockpiten Cafe AS | Florø | 2014 |
| Cocktail Brasseri Og Bar AS | Kragerø | 2025 |
| Coco Bar AS | Kleppe | 2022 |
| Coco Cafe AS | Tromsø | 2025 |
| Coco Grüner Ans | Oslo | 2005 |
| Cocoa Café and Eatery AS | Oslo | 2021 |
| Cocobolo AS | Drammen | 2017 |
| Cocobongo AS | Nordfjordeid | 2024 |
| Cocorico Holding AS | Ramfjordbotn | 2023 |
| Coffee 2GO Bar AS | Flå | 2025 |
| Coffee Corner AS | Kleppe | 2020 |
| Coffee Too Catering Og Arrangementer AS | Eidsvoll Verk | 2020 |
| Coffeeberry Sandnes AS | Sandnes | 2011 |
| Coffeedeli Ans | Oslo | 2002 |
| Cohiba Invest AS | Kinsarvik | 2013 |
| Cohost AS | Stavanger | 2023 |
| Colbjørnsens Gate 3 AS | Oslo | 1913 |
| Colin Holding AS | Oslo | 2015 |
| Colletts Parkservering AS | Oslo | 2026 |
| Colonialen 44 AS | Bergen | 2012 |
| Colonialen AS | Bergen | 2005 |
| Colonialen Jest AS | Bergen | 2024 |
| Colonialen Litteraturhuset AS | Bergen | 2012 |
| Colonialen Sundt AS | Bergen | 2024 |
| Color Hotels AS | Oslo | 1998 |
| Com Con AS | Skien | 1996 |
| Comedor Ltd Nuf | Oslo | 2011 |
| Comer AS | Kristiansand S | 2007 |
| Comfort Hotel Børsparken AS | Oslo | 1995 |
| Comfort Hotel Grenlandsporten AS | Langangen | 2024 |
| Comfort Hotel Grimstad AS | Porsgrunn | 2024 |
| Comfort Hotel Holberg AS | Bergen | 1991 |
| Comfort Hotel Horten Brygge AS | Porsgrunn | 2020 |
| Comfort Hotel Kristiansand AS | Kristiansand S | 1986 |
| Comfort Hotel Moss AS | Porsgrunn | 2021 |
| Comfort Hotel Park AS | Trondheim | 2005 |
| Comfort Hotel Porsgrunn AS | Porsgrunn | 2016 |
| Comfort Hotel Skien Brygge AS | Porsgrunn | 2020 |
| Comfort Hotel Trondheim AS | Trondheim | 2000 |
| Comfort Hotel Xpress Tønsberg AS | Porsgrunn | 2026 |
| Comida De Mar AS | Henningsvær | 2024 |
| Compa Holding AS | Sandnes | 2005 |
| Compagnie AS | Levanger | 2022 |
| Compass Group Norge AS | Oslo | 1989 |
| Compass Holding Norge AS | Oslo | 1997 |
| Compho AS | Oslo | 2023 |
| Concept Consulting & Catering AS | Oslo | 2019 |
| Concepts Club AS | Haslum | 2021 |
| Concord Invest AS | Havøysund | 2005 |
| Concrete Head AS | Oslo | 2022 |
| Confused Baked Potato AS | Lørenskog | 2025 |
| Conntrak Catering Limited Nuf | Aberdeenshire Ab32 6Fj Scotland | 2026 |
| Conntrak Catering Services LLC Nuf | Ae-Al Danah, East 3 | 2026 |
| Continental Holding AS | Oslo | 2020 |
| Convector Group AS | Bekkestua | 2024 |
| Convector Management Sentrum AS | Bekkestua | 2009 |
| Cool Cabins AS | Sandhornøy | 2025 |
| Coolcation Norway AS | Kristiansund N | 2025 |
| Cooly AS | Oslo | 1996 |
| Coostina AS | Oslo | 2019 |
| Copper Creek Lodge AS | Meråker | 2024 |
| Cora Aker Brygge AS | Oslo | 2023 |
| Corcovado AS | Oslo | 2023 |
| Cordial AS | Oslo | 2023 |
| Core Hotel Bergen AS | Bergen | 2018 |
| Core Hotel Tromsø AS | Tromsø | 2018 |
| Cork AS | Oslo | 2025 |
| Cornelius AS | Bjørøyhamn | 1999 |
| Cornelius Invest AS | Oslo | 2021 |
| Cornelius Kaffebrenderi Ans | Hundvåg | 1999 |
| Corner AS | Honningsvåg | 1996 |
| Corner Hotell AS | Brønnøysund | 1964 |
| Corner Pizza Og Grill AS | Eidsdal | 2017 |