| Børnes Og Fosse Snekkerverksted AS | Kleppestø | 1997 |
| Børnich AS | Oslo | 2026 |
| Børsa Båtløft AS | Børsa | 2024 |
| Børsebakke Maskin AS | Dilling | 2024 |
| Børsemaker Anton Barsch AS | Leinesfjord | 2024 |
| Børsemaker Svartvatn AS | Finneidfjord | 2014 |
| Børsemaker Tor Solberg AS | Askim | 2021 |
| Børsemaker Wear AS | Steinsholt | 2014 |
| Børøya Industri AS | Stokmarknes | 2026 |
| Bøteservice AS | Båtsfjord | 2021 |
| Bøvågen Holding AS | Bøvågen | 2021 |
| Bühler Almere B.V. Nuf | 1332 Ea Almere | 2026 |
| Bühler Denmark A/S Nuf | Dk-2740 Skovlunde | 2025 |
| Bühler GmbH Nuf | De-38114 Braunschweig | 2025 |
| Båt og Motorservice AS | Austafjord | 1988 |
| C a Johansson Snekkerifabrikk AS | Oslo | 2024 |
| C Food Norway AS | Ålesund | 2016 |
| C H Evensen Industriovner AS | Fredrikstad | 2010 |
| C Robotics AS | Kristiansund N | 2017 |
| C Stjernstrøm AS | Tromsø | 2026 |
| C&C Shipping Solutions Norway | It-16153 Genova | 2018 |
| C-Works AS | Oslo | 2013 |
| C-You AS | Stokke | 2017 |
| C. Lund Holding AS | Ski | 2018 |
| C.G. Costruzioni Generali S.R.L | It-20015 Parabiago, Milano | 2016 |
| C.G. Holding AS | Skoppum | 2019 |
| C.H. Rustfri Norge AS | Nesøya | 2019 |
| C.Nilsen AS | Oslo | 2023 |
| C.S.W. Machinery B.V. | Nl-7418 Ew Deventer | 2022 |
| C.Valstad & Co. Båtbyggeri AS | Rognan | 2014 |
| C.Øverland AS | Elnesvågen | 2025 |
| C2E Sportswear AS | Åros | 2024 |
| Ca Group AS | Oslo | 2010 |
| Ca Spec Sveising AS | Oslo | 2023 |
| Cablemec AS | Hønefoss | 2024 |
| Cacaoisme AS | Rollag | 2021 |
| Caccer AS | Slattum | 2008 |
| Cadio AS | Heimdal | 2011 |
| Cadtec AS | Trondheim | 1990 |
| Caerus Capital AS | Oslo | 2001 |
| Caf Rail UK Limited | Belfast Bt1 3Bh | 2026 |
| Cafe Ambrosia AS | Bergen | 2017 |
| Caflo Salmon AS | Oslo | 2020 |
| Cairn Holding AS | Ål | 2025 |
| Caka AS | Snarøya | 2005 |
| Cal Trykk AS | Sellebakk | 1986 |
| Calanda Eiendom AS | Oppaker | 1986 |
| Calanus AS | Tromsø | 2002 |
| Caldan Conveyor | Dk-8464 Galten | 2015 |
| Calida AG | Ch-6210 Susee | 1997 |
| Callenberg | 5220 Odense Sø | 2013 |
| Calora Mooring Systems AS | Sandefjord | 2016 |
| Calvia On/Offshore Service | Es-07160 Peguera | 2018 |
| Cama 1 Spa | It-Cap 20124 Milano | 2020 |
| Cama-Nikri AS | Fornebu | 2006 |
| Camaco Card Consulting Aktiebolag | Se-115 20 Stockholm | 2015 |
| Camina AS | Bekkestua | 2021 |
| Camisa AS | Tiller | 1996 |
| Campuspharma AB | Se-411 25 Gothenburg | 2016 |
| Candis AS | Skien | 2020 |
| Candles Cake KRS AS | Kristiansand S | 2025 |
| Candy AS | Vinterbro | 1995 |
| Canion AS | Meistervik | 2020 |
| Cannac Holding AS | Drammen | 2021 |
| Cannelle Bakeri AS | Saura | 2023 |
| Capadyne Systems AS | Oppegård | 2026 |
| Capipro AS | Bodø | 2024 |
| Cappelen Holding AS | Ulefoss | 2021 |
| Capro Cases AS | Støren | 2013 |
| Carat Norge AS | Namsskogan | 2000 |
| Caraway A/S | Sandvika | 2019 |
| Carba AS | Laksevåg | 2011 |
| Carboline Norge AS | Lierstranda | 1999 |
| Carbon Centric AS | Grålum | 2021 |
| Carbon Dynamics AS | Oslo | 2024 |
| Cardan Service Norway AS | Oslo | 2023 |
| Cardiomech AS | Oslo | 2015 |
| Carenero AS | Oslo | 2015 |
| Caresafe AS | Asker | 2023 |
| Cargill Foods France SAS | Bergen | 2016 |
| Cargill Inc | Bergen | 2016 |
| Cargill Norway AS | Bergen | 2015 |
| Cargill Norway Holding AS | Bergen | 2015 |
| Cargotec Sweden Aktiebolag | Se-164 22 Kista | 2009 |
| Carlsberg Accounting Service Centre SP. Z.O.O. | Pl-61-756 Poznan | 2012 |
| Carlsberg Breweries AS | Dk-1760 København V | 2002 |
| Carlson Healthy Oils AS | Søvik | 2008 |
| Carma Lysreklame AS | Ingeberg | 2007 |
| Carner AS | Sande I Vestfold | 2023 |
| Carnis AS | Hunndalen | 2023 |
| Carpenter AS | Åndalsnes | 1967 |
| Carsoe Norge AS | Tromsø | 2006 |
| Carsoe Seafood | Dk-9220 Aalborg Øst | 2022 |
| Carter Invest AS | Hvasser | 2011 |
| Carter Service AS | Flekkefjord | 2025 |
| Cartixas & Larssen Lda | Pt-2655 461 Ericeira | 2019 |
| Cas Eg AS | Oslo | 1997 |
| Casa Carolina AS | Rakkestad | 2008 |
| Casa Clave AS | Drammen | 2023 |
| Cascade Scandinavia Hydraulik AB | Oslo | 1995 |