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| Cruise Sørlandet AS | Kristiansand S | 2026 |
| Cruise Varanger AS | Vardø | 2025 |
| Cruise Yacht Opco Ltd | Mt-Floriana Frn 1914 | 2026 |
| Cruisecompagniet AS | Slemmestad | 2021 |
| Cruisespesialisten AS | Bergen | 1992 |
| Cruit AS | Oslo | 2007 |
| Cruit Rekruttering AS | Oslo | 2019 |
| CRV Services AS | Oslo | 2019 |
| Cryogenic Container Solutions B.V | 3072Ap Rotterdam | 2017 |
| Crystal Lifestyle Tours AS | Mogreina | 2025 |
| Crystal River Cruises Manning Limited | Mt-Frn1400 Floriana | 2021 |
| Crystal Service AS | Trondheim | 2013 |
| CS Services AS | Espeland | 2018 |
| CS Team AS | Rådal | 2023 |
| CSC Corporation Hong Kong Ltd | Kwun Tong, Kowloon | 2015 |
| CSC Leasing Company | Richmond, Va 23230 | 2025 |
| CSH Service AS | Steinsdalen | 2025 |
| Csi Leasing UK Limited | Chapletown S Yorkshire S35 2Ph | 2008 |
| Csi Marine Cleaning AS | Stavanger | 2016 |
| CSJ Alusteel Aps | Dk-5330 Munkebro | 2018 |
| CSP Utleie AS | Alta | 2026 |
| Csr-Norge Nuf | Oslo | 2006 |
| Csss AS | Trysil | 2026 |
| CSV Shipping AS | Stavanger | 2012 |
| CT Industrier AS | Tyssedal | 2014 |
| CT Maskin AS | Silsand | 2026 |
| CTC Bilpartner AS | Jessheim | 1989 |
| Cti AS | Trondheim | 1990 |
| Cti Systems SA | Oslo | 1999 |
| CTM Computer Technik Marketing GmbH Nuf | De-28816 Stuhr | 2026 |
| Ctrl Renhold AS | Os | 2020 |
| Cuba for Helsen Nuf | Tårnåsen | 2009 |
| Cuba Varebilutleie AS | Lierstranda | 2009 |
| Cuba-Norge Dans AS | Bergen | 2016 |
| Cudo Ventures Ltd | London Ec1V 2Nx | 2024 |
| Cue Event AS | Oslo | 2024 |
| Cue Event Management AS | Fenstad | 2013 |
| Cura Bemanning AS | Krokkleiva | 2024 |
| Curaliv Norge Nuf | Se-170 62 Solna | 2022 |
| Curio Bemanning AS | Oslo | 2024 |
| Curves International Inc. | Oslo | 2010 |
| Cusso AS | Haugesund | 2016 |
| Custom Arctic Adventure Lofoten AS | Gravdal | 2024 |
| Customer Connecting AS | Oslo | 2019 |
| Customer Link AS | Kristiansand S | 2009 |
| Customs Support Sweden AB | Oslo | 2014 |
| Cva International SA | Ch-1227 Carouge | 2019 |
| Cws-Holding AS | Drangedal | 2014 |
| CXC Consultants Exchange Ltd | Cork | 2009 |
| CXC Global Sweden AB | Se-113 56 Stockholm | 2024 |
| Cyberwash Systemer AS | Geilo | 2004 |
| Cybret AI AS | Hægeland | 2025 |
| Cynk Norge | Se-131 54 Sverige | 2025 |
| Cyprus Home & Tourist Agency AS | Oslo | 2023 |
| Cyviz Ltd Norway | Dalkeith, Midlothian Eh22 3Nu | 2024 |
| CZ Vaktmestertjenester AS | Vollen | 2024 |
| D IT Solutions Ltd | Sandefjord | 2014 |
| D Lux AS | Sandefjord | 2019 |
| D&I Investment AS | Steinberg | 2024 |
| D'Fous Lunix AS | Tomrefjord | 2009 |
| D.H Eiendom AS | Inndyr | 2016 |
| D.H. Sandvik Tjenester AS | Hunndalen | 2025 |
| D.W.C Engineering Limited | Nottinghamshire Dn22 7Xh | 2020 |
| D1AMONDVFITNESS AB Nuf | Se-25451, Helsingborg | 2026 |
| D3 Dynamic Delicate Details AS | Kolbjørnsvik | 2018 |
| Da Kaasa & Jacobsen | Tolvsrød | 1988 |
| Da Søco Jonny Sørensen & Co | Tromsdalen | 1987 |
| Da Vinci Associates Ltd | Hampshire Po17 6Dg | 2016 |
| Da-Service Da | Sem | 2007 |
| Daa Holding AS | Sandefjord | 2020 |
| Daas Bygg & Montage AB Nuf | Se-174 43 Sundbyberg | 2025 |
| Dab Technical Services Ltd | Ca14 1Bf Workington, Cumria | 2020 |
| Dab Utleie AS | Helgeroa | 2017 |
| Dade Beharing Systems GmbH | Oslo | 2000 |
| Daedalus Projects En Trade B.V. | 5026Sr Tilburg | 2021 |
| Dag & Bjørn Maskinutleie Da | Porsgrunn | 2000 |
| Dag Aasbø Travel AS | Sandefjord | 2005 |
| Dag Renholdservice AS | Lørenskog | 2023 |
| Daglig Vedlikehold Ans | Hakadal | 1979 |
| Dagmamma AS | Oslo | 2017 |
| Dagny Møllerplass AS | Gol | 2024 |
| Dags Vaktmesterservice AS | Frolands Verk | 2010 |
| Dagslys AS | Oslo | 1997 |
| Dagslys Innlandet AS | Furnes | 2020 |
| Dagslys Vest AS | Bergen | 2020 |
| Dahl Rekruttering AS | Jar | 2024 |
| Dahl Ventures AS | Lillestrøm | 2024 |
| Dahlberg Årstad AS | Oslo | 2013 |
| Dahles Bilutleie AS | Sarpsborg | 2003 |
| Dahlgrens Kranuthyrning AB Nuf | 641 39 Katrineholm | 2022 |
| Daikatana Malta Ltd | Mt-Hmr 2030 Hamrun | 2025 |
| Daikatana S.R.O. Nuf | Oslo | 2010 |
| Daily Employment Services Ltd | Gb-Cheshire Cw9 7Ra | 2017 |
| Dal Maskinutleie AS | Dal | 2022 |
| Dal Sterling (Hong Kong) Ltd | Central Hong Kong | 2010 |
| Dal Sterling International Inc | Houston Texas 77074 | 2008 |