| BTL Holding AS | | 2025 |
| Budbilen AS | Transport & logistics | 2021 |
| Buerhaven Trinn 4 AS | Real estate | 2011 |
| Bugten Marina AS | Transport & logistics | 2022 |
| Bugten Yacht Club AS | Arts & recreation | 1968 |
| Builder AS | Information & communication | 2022 |
| Bukkespranget Vann Og Avløp SA | Water & waste | 2018 |
| Butterfly`S AS | Professional & scientific | 2017 |
| BVH Eiendom AS | Real estate | 2005 |
| BVN 4 Holding AS | Real estate | 2016 |
| Byens Hjerte AS | Hospitality | 2022 |
| Bygg Og Renovering Grenland AS | Construction | 2026 |
| Bygg Og Renovering Telemark AS | Construction | 2022 |
| Bygge Beat AS | Construction | 2022 |
| Byggmester Arild Høgseth AS | Construction | 2018 |
| Byggmester Arnfin Ramsåsen AS | Construction | 2006 |
| Byggmester Eivind Larsen AS | Construction | 2013 |
| Byggmester Pål J. Berg AS | Construction | 2007 |
| Bygjordet Bygg AS | Construction | 2025 |
| Byglands Begravelsesbyråer AS | Other services | 2017 |
| Bygolf AS | Administrative & support | 2026 |
| Byström Steinlegging & Hagearbeid AS | Construction | 2020 |
| Bærø Holding AS | | 2023 |
| Bølevegen Utbygging AS | Real estate | 2019 |
| Børres Holding AS | Financial services | 2018 |
| Børve Borchsenius Arkitekter AS | Professional & scientific | 1978 |
| C. Riise Invest AS | | 2025 |
| C.M. Invest AS | | 2021 |
| Cab 1729 AS | | 2017 |
| Cafe Ak AS | Hospitality | 2020 |
| Cafe Kopp Catering AS | Hospitality | 2000 |
| Cafe Lea AS | Hospitality | 2025 |
| Cafe Osebro AS | Hospitality | 1995 |
| Cafe Sjøbris AS | Hospitality | 2017 |
| Calderys Norway AS | Administrative & support | 2022 |
| Camp Abby Da | Arts & recreation | 2006 |
| Campini Da | Wholesale & retail | 2016 |
| Campino Porsgrunn AS | Hospitality | 2023 |
| Canal Boats Telemark AS | Administrative & support | 2020 |
| Candeo Invest AS | | 2005 |
| Canina Rosa AS | Real estate | 2011 |
| Capital Holding AS | | 2025 |
| Capital Property AS | Real estate | 2025 |
| Capitalia AS | Professional & scientific | 2011 |
| Capitane Hotels AS | Hospitality | 2019 |
| Card Kings AS | Wholesale & retail | 2026 |
| Carla Studio AS | Wholesale & retail | 1956 |
| Carlo Gavazzi AS | Wholesale & retail | 1984 |
| Carlstad AS | Administrative & support | 2022 |
| Carnel Vanden Bussche AS | Professional & scientific | 2016 |
| Carpe Diem AS | Real estate | 2003 |
| Cartivise AS | | 2025 |
| Cathodic AS | Wholesale & retail | 2004 |
| Centriair AS | Wholesale & retail | 2020 |
| CGV Holding AS | Professional & scientific | 2010 |
| Cham Holding AS | Construction | 2022 |
| Chamberlain Holding AS | | 2026 |
| Chanette AS | Professional & scientific | 1987 |
| China Palace Ans | Hospitality | 1990 |
| China Palace Restaurant Ans | Hospitality | 1996 |
| Choice AS | Wholesale & retail | 1988 |
| Christian Invest AS | Real estate | 2005 |
| Christiania Deco AS | Wholesale & retail | 2006 |
| Cim Consult Scandinavia AS | Wholesale & retail | 2002 |
| Cim Consult Solution AS | Wholesale & retail | 2002 |
| Cinco Eiendom AS | Real estate | 2022 |
| Circumflex AS | Information & communication | 2022 |
| Cirkus AS | Professional & scientific | 2004 |
| Citereja AS | Other services | 2022 |
| Citereja Holding AS | Construction | 2021 |
| City Garn AS | Wholesale & retail | 2024 |
| CK Dermatological Solutions and Services AS | Health & social care | 2019 |
| Class-A Entertainment AS | Arts & recreation | 2013 |
| Clemmetsen Holding AS | Professional & scientific | 2022 |
| CLH Holding AS | Health & social care | 2018 |
| CLH Village AS | Real estate | 2025 |
| CLK Utleieservice AS | Real estate | 2022 |
| CLS Investments AS | | 2022 |
| CMC Holding AS | | 2024 |
| Cochise Holding AS | | 2010 |
| Cocox Holding AS | | 2024 |
| Coded AS | Information & communication | 2021 |
| Comfort Hotel Grimstad AS | Hospitality | 2024 |
| Comfort Hotel Horten Brygge AS | Hospitality | 2020 |
| Comfort Hotel Moss AS | Hospitality | 2021 |
| Comfort Hotel Porsgrunn AS | Hospitality | 2016 |
| Comfort Hotel Skien Brygge AS | Hospitality | 2020 |
| Comfort Hotel Xpress Tønsberg AS | Hospitality | 2026 |
| Commerce & Consulting Services AS | Real estate | 1998 |
| Condrups Colonial AS | Wholesale & retail | 2026 |
| Construction Safety and Supply AS | Wholesale & retail | 2019 |
| Contentcloud AS | Professional & scientific | 2023 |
| Contrago AS | Information & communication | 2026 |
| Control Invest AS | Real estate | 2015 |
| Controlpartner AS | Information & communication | 2015 |
| Convex Compounding AS | Information & communication | 2020 |
| Conzo AS | Professional & scientific | 2015 |
| Copia Cap AS | Professional & scientific | 2026 |
| Cor Norge AS | Professional & scientific | 2025 |
| Corn AS | Real estate | 2018 |