| Columbia Shipmanagement Norway AS | Lysaker | 2023 |
| Come on Travel AS | Sandvika | 2001 |
| Comfort Drive AS | Oslo | 2023 |
| Comfort Turbuss Berisha AS | Valestrandsfossen | 2015 |
| Comfy Hus AS | Straume | 2022 |
| Commet Trans Karol Janiszewski | Pl-80298 Gdansk | 2013 |
| Comodality Norway AS | Oslo | 2018 |
| Compactstudio AS | Hosle | 2000 |
| Compcar AS | Sagstua | 2026 |
| Complete AS | Flaktveit | 2024 |
| Complete- Transport AS | Flaktveit | 2024 |
| Complex-Tsl Group Spolka Z Ograniczona Odpowiedzialnoscia Nuf | 83-400 Koscierzyna | 2023 |
| Complexsad Norway AS | Borgenhaugen | 2016 |
| Concorde Holding AS | Siggerud | 2008 |
| Concorde Transport Service AS | Skjeberg | 2025 |
| Concordia Capo AS | Haugesund | 1996 |
| Concordia Foss AS | Haugesund | 1996 |
| Concordia Maritime AG | Oslo | 2004 |
| Concordia Star AS | Haugesund | 1996 |
| Concordia Viking AS | Kristiansand S | 1990 |
| Concreto Transport AS | Årnes | 2025 |
| Connect Bus AS | Trollåsen | 2021 |
| Connect Bus Ekspress AS | Trollåsen | 1996 |
| Connect Bus Norge AS | Trollåsen | 1995 |
| Connexus AS | Askim | 2024 |
| Conoco Jet Nordic AB | Se-164 86 Stockholm | 2000 |
| Constellation Cold Logistics Norway AS | Gamle Fredrikstad | 2003 |
| Constellation Cold Logistics Tønsberg AS | Sem | 2022 |
| Constellation Holding Norway AS | Gamle Fredrikstad | 2019 |
| Constellation Transport Norway AS | Gamle Fredrikstad | 1991 |
| Container Consult AS | Ålesund | 1990 |
| Container Transport AS | Skotterud | 1990 |
| Containercarrier I AS | Haugesund | 2005 |
| Containerservice AS | Alta | 2001 |
| Containerservice Ottersøy AS | Ottersøy | 2024 |
| Conveeni Group AS | Bekkestua | 2018 |
| Conway Transport | Dk-8940 Randers Sv | 2001 |
| Conwell AS | Holmestrand | 2011 |
| Cool Cargo AS | Dilling | 2012 |
| Cool Cargo Varanger AS | Vadsø | 2018 |
| Cool Company Management AS | Oslo | 2010 |
| Cool Frakt AS | Mo I Rana | 2020 |
| Cool Trans AS | Krokelvdalen | 2013 |
| Coolrunner Aps | Dk-9400 Nørresundby | 2019 |
| Coop Norge Transport AS | Jessheim | 2015 |
| Copilot AS | Vågstranda | 2018 |
| Coral Tankers GmbH Nuf | Haugesund | 2020 |
| Cordoba Transport AS | Husnes | 2019 |
| Cormorant AS | Skjervøy | 2023 |
| Coronado AS | Mosterhamn | 2017 |
| Coronet Norge AS | Oslo | 1969 |
| Cortén AS | Langhus | 2005 |
| Cosco Shipping Lines Nordic A/S Nuf | Oslo | 2003 |
| Costo Nuf | Lt-76197 Siauliai | 2022 |
| Cotrack Crane AS | Fjellhamar | 2020 |
| Cotrack Transportsentralen AS | Fjellhamar | 2022 |
| Cour Rent Services AS | Oslo | 2025 |
| CR Eiendom AS | Storebø | 2011 |
| CR Transport AS | Heimdal | 2021 |
| Crane Norway Nord AS | Tromsø | 1978 |
| Crane Worldwide Logistics Norway AS | Sandnes | 2026 |
| Crazytrans Spolka Z Ograniczona Odpowiedzialnoscia Nuf | 74-200 Pyrzyce | 2026 |
| Creative Freight Norway AS | Oslo | 2025 |
| Creo Logistikk AS | Sandnes | 2025 |
| Crested Enterprises Limited | Road Town Tortola | 2020 |
| Crewtaxi AS | Kristiansund N | 2013 |
| Crossocean AS | Bergen | 2007 |
| Crown Hill Chartering AS | Kokstad | 1983 |
| Crown Hill Shipping AS | Kokstad | 1993 |
| Crown Venture AS | Rud | 2010 |
| Crown Worldwide Movers AS | Oslo | 2000 |
| Crude Tankers III AS | Oslo | 2014 |
| Crude Trans AS | Oslo | 2025 |
| Cruise Lofoten AS | Kabelvåg | 2019 |
| Cruise Service AS | Langevåg | 2018 |
| Cruisepersille AS | Sætre | 2026 |
| CS Norway AS | Oslo | 2024 |
| CS Transport AS | Oslo | 2022 |
| CSL Europe Limited Nuf | Berkshire Sl4 1Ld | 2011 |
| CSL Holding AS | Oslo | 2021 |
| CSL Norse Holdings AS | Bergen | 2018 |
| CSL Norway AS | Bergen | 2010 |
| Cssa Chartering and Shipping Services S.A. | 1215 Geneve 15 | 2015 |
| Cura AS | Trondheim | 2025 |
| Current Spirit AS | Stavanger | 2017 |
| Custom & Cargo AS | Klepp Stasjon | 2006 |
| Customs Support Norway AS | Oslo | 2012 |
| Cuveco AS | Lysaker | 2001 |
| CW Spedition Aps | Dk-9850 Hirtshals | 2022 |
| D H a Bemanning AS | Oslo | 2021 |
| D&A Transport AS | Drammen | 2021 |
| D&R Transport Da | Oslo | 2021 |
| D. Sætre Transport AS | Halsnøy Kloster | 2012 |
| D.A.F Spedition Norge AS | Skedsmokorset | 2008 |
| D.K.T AS | Solbergmoen | 2017 |
| D10 Grønlikaia Sjø AS | Oslo | 2012 |
| D4DILEVERY AS | Oslo | 2025 |
| D4DXPRESS | Lt-02300 Vilnius | 2020 |
| D6 Loengkaia AS | Oslo | 2012 |
| D7 Grønlia AS | Oslo | 2012 |