| Che Invest AS | Flekkefjord | 2014 |
| Check Accounting AS | Grålum | 2020 |
| Checkmate Industrial Inspections Limited | Middlesbrough Ts5 6Ha England | 2020 |
| Cheerchoice AS | Oslo | 2025 |
| Chef Digital Markedsføring AS | Farsund | 2024 |
| Chemet Spolka Akcyjna | Pl-42600 Tarnowskie Góry | 2021 |
| Chemical Compass AS | Larvik | 2025 |
| Chemieanlagenbau Chemnitz GmbH | De-09111 Chemnitz | 2019 |
| Chemin GmbH | De-86167 Augsburg | 2024 |
| Chemitech Consulting AS | Mosjøen | 2014 |
| Chemsafe AS | Bønes | 2018 |
| Chemwise AS | Oslo | 2025 |
| Chen Media AS | Oslo | 2022 |
| Cheraton AS | Hommersåk | 2019 |
| Cherry Agency AS | Oslo | 2024 |
| Cherry Fjord AS | Hundvåg | 2025 |
| Cherry Management AS | Oslo | 2023 |
| Chess AS | Rolvsøy | 2015 |
| Chess Invest AS | Jar | 2019 |
| Chevere AS | Nesbru | 2020 |
| Cheviot Associates Ltd | Northumberland Ne66 3Tp | 2005 |
| Chevni AS | Asker | 2002 |
| Chevron Energy Ltd | London E14 4Ha England | 2020 |
| Chevron Services Norway AS | Lysaker | 2018 |
| CHG AS | Oslo | 2009 |
| Chibit Holding AS | Ranheim | 2005 |
| Chic Agency AS | Oslo | 2026 |
| Chiesi Pharma AB Filial Norge Nuf | Se-111 22 Stockholm | 2019 |
| Chiffer Advokatfirma & Finans AS | Oslo | 2021 |
| Chili Harstad AS | Harstad | 1998 |
| Chili Holding AS | Harstad | 2004 |
| Chili Publications AS | Oslo | 2006 |
| Chill Engineering Ltd | Tananger | 2020 |
| Chillbiz AS | Oslo | 2020 |
| Chilthorne Limited | Essex Ss1 1Bn | 2018 |
| Chimaera AS | Rådal | 2006 |
| Chimborazo AS | Tromsø | 2012 |
| Chimborazo Holding AS | Oslo | 2024 |
| Chimec S.P.A. | Roma 00144 | 2016 |
| Chimeras AS | Bergen | 2024 |
| China Classification Society Nuf | Bergen | 2014 |
| China Oilfield Services Limited | Cn-Tanggu Tianjin | 2009 |
| Chincha Consulting AS | Trondheim | 2020 |
| Chinma Holding AS | Oslo | 2005 |
| Chinook AS | Ålesund | 2019 |
| Chinook Service AS | Ålesund | 2010 |
| Chinordic AS | Oslo | 2018 |
| Chip Nanoimaging AS | Tromsø | 2019 |
| Chip Teknikk AS | Lampeland | 1988 |
| Chiquita Banana Company BV | Oslo | 1995 |
| Chiron AS | Trondheim | 2019 |
| Chishti Capital Investment AS | Oslo | 2017 |
| Chiso Holding AS | Søvik | 2021 |
| Chitofun Biotech AS | Ås | 2023 |
| Chiyo Agency AS | Fredrikstad | 2025 |
| CHK AS | Hosle | 2022 |
| Chkle AS | Sandefjord | 2018 |
| Cho Consulting AS | Skedsmokorset | 2025 |
| Choice Consult AS | Stadsbygd | 2005 |
| Chol AS | Høvik | 2021 |
| Chondro Engineering AS | Tromsø | 2012 |
| Chonica Butikkutvikling AS | Dokka | 2006 |
| Chonica Capital AS | Dokka | 2006 |
| Choose Design & Interiør AS | Kristiansand S | 2020 |
| Chopshopagency AS | Oslo | 2021 |
| Chord Consulting AS | Fetsund | 2019 |
| Choreobase AS | Oslo | 2023 |
| Chorley Designs Limited | Somerset Bath Ba1 7Ah England | 2007 |
| Chpasvd AS | Kolbotn | 2024 |
| CHR. Olsen Consulting Aps | Dk-2830 Virum | 2022 |
| CHR. Reme AS | Lindesnes | 2011 |
| Chrami AS | Oslo | 2022 |
| Chris Eaton Consultants Limited | Billingham Ts22 5Ez | 2022 |
| Chris Enterprise AS | Oslo | 2011 |
| Chris Kerr Services Ltd | Westhill Ab32 6Az, Aberdeenshire | 2019 |
| Chris Petro AS | Sola | 1996 |
| Chris Wilson Diving Ltd | Barrow-In-Furness La144Hh | 2023 |
| Chris's Corporation AS | Oslo | 2015 |
| Chrisanic II AS | Oslo | 2016 |
| Chrisanic Invest AS | Oslo | 2016 |
| Chrissy Lee Productions AS | Tromsø | 2020 |
| Christ Innovation AS | Vollen | 2020 |
| Christen Bruno AS | Oslo | 2024 |
| Christen Magne Landbø AS | Arendal | 1986 |
| Christensen & Co Arkitekter Nuf | 2200 København N | 2015 |
| Christensen & Co AS | Vikersund | 2024 |
| Christensen & Partners AS | Lier | 2019 |
| Christho AS | Bodø | 2005 |
| Christian Brødreskift Prosjekt- Og Byggeledelse AS | Tiller | 1995 |
| Christian Michelsen Energy Advisors AS | Nesttun | 2024 |
| Christian Oskarsson AS | Alta | 2015 |
| Christian Pagh AS | Oslo | 2021 |
| Christian Schnitler AS | Oslo | 2015 |
| Christian Sundby Arkitekter AS | Stabekk | 2016 |
| Christian Thorsbye AS | Skien | 2012 |
| Christian Wightwick Alfsen AS | Oslo | 2026 |
| Christiane Consulting AS | Slependen | 2006 |
| Christianfjeld AS | Elverum | 2023 |
| Christiania Partners AS | Oslo | 2019 |
| Christiania Regnskap AS | Oslo | 2017 |