| Byggtorget Kristiansund AS | Wholesale & retail | 2015 |
| Bymann Ans | Real estate | 2024 |
| Byskogen Invest Ans | Hospitality | 1994 |
| Bøifot Elektro Ansatte AS | Administrative & support | 2011 |
| Bøifot Elektro AS | Construction | 1998 |
| Bølgebakken Invest AS | Real estate | 2020 |
| Bølgen Invest AS | Financial services | 2004 |
| C Robotics AS | Manufacturing | 2017 |
| C.Grøntvedt Management AS | Administrative & support | 2023 |
| Cabin Rent AS | Real estate | 2023 |
| Cafe Og Bar AS | Hospitality | 2021 |
| Calipo AS | Wholesale & retail | 1995 |
| Campus Private Klinikk AS | Health & social care | 2022 |
| Campus Utvikling AS | Other services | 2022 |
| Camview Da | Information & communication | 2024 |
| Caos AS | Wholesale & retail | 2024 |
| Cardly AS | Information & communication | 2021 |
| Carlsen Ur AS | Wholesale & retail | 2015 |
| Castillo Fried Chicken AS | Hospitality | 2025 |
| Castra Eiendom AS | Real estate | 2023 |
| CC Norway AS | Transport & logistics | 2015 |
| Cebo AS | Administrative & support | 2013 |
| Cecilie Ohr Holding AS | | 2024 |
| Cenbry Holding AS | Transport & logistics | 2024 |
| Center Eiendomsutvikling AS | Real estate | 2005 |
| Centrum Økonomiservice AS | Professional & scientific | 1983 |
| Ceylonia AS | Wholesale & retail | 2026 |
| Cguard AS | Professional & scientific | 2018 |
| China House 68 AS | Hospitality | 2009 |
| City Trafikkskole AS | Education | 1978 |
| Climb Consulting AS | Professional & scientific | 2011 |
| Cloud Innovation AS | Information & communication | 2020 |
| Cmud AS | Health & social care | 2009 |
| CN Holding AS | Real estate | 2015 |
| Commeo AS | Professional & scientific | 2012 |
| Coolcation Norway AS | Hospitality | 2025 |
| Corevo Holding AS | | 2025 |
| Corner Eiendom AS | Real estate | 2023 |
| Corner Nanobryggeri AS | Manufacturing | 2024 |
| Cow Hills Nordics AS | Information & communication | 2022 |
| Creative House Kristiansund AS | Arts & recreation | 2022 |
| Crewtaxi AS | Transport & logistics | 2013 |
| Crossfit Kristiansund AS | Arts & recreation | 2015 |
| Crusher Nordic Co AS | Wholesale & retail | 2012 |
| Cvi Holding AS | | 2025 |
| CXP Midt-Norge AS | Construction | 2022 |
| Cygreen AS | Professional & scientific | 2026 |
| D & D Drift & Design Da | Information & communication | 2003 |
| Dacha Da | Real estate | 2001 |
| Dagognatt AS | Information & communication | 2020 |
| Dahle Holding AS | Real estate | 1985 |
| Dahle Jenssen Eiendom AS | Real estate | 2000 |
| Dahlehallen AS | Real estate | 1990 |
| Dalabukta Utbygging AS | Real estate | 2010 |
| Damsgårdsveien 70 AS | Real estate | 2009 |
| Dan Holding AS | Education | 2005 |
| Danholmengen AS | Professional & scientific | 2021 |
| Dansekraft AS | Education | 2024 |
| Dantek AS | Manufacturing | 2025 |
| Deep C Equipment AS | Administrative & support | 2021 |
| Deep C Finans 2 AS | Administrative & support | 2012 |
| Deep C Holding AS | Mining & quarrying | 2021 |
| Deep C Invest AS | Real estate | 2012 |
| Deep C Solutions AS | Mining & quarrying | 2021 |
| Dei Invest AS | | 2022 |
| Dekkteam Kristiansund AS | Wholesale & retail | 2007 |
| Demari AS | Wholesale & retail | 2018 |
| Dental Service Scarbarth AS | Manufacturing | 2021 |
| Des Consult AS | Professional & scientific | 2019 |
| Des Holding AS | Professional & scientific | 2018 |
| Diallo Holding AS | | 2022 |
| Din Frisør Kristiansund AS | Other services | 2014 |
| Din Partner Midt-Norge AS | Wholesale & retail | 2007 |
| Diner Thai & Thai AS | Hospitality | 2025 |
| Diner Thai & Thai Da | Hospitality | 2010 |
| Drømmestrikk AS | Wholesale & retail | 2018 |
| DS Nor AS | Wholesale & retail | 2011 |
| DTS Holding AS | Real estate | 2015 |
| Duaa AS | Real estate | 2005 |
| Dyrnesenga AS | Real estate | 2016 |
| Dødeladen Cafe Og Restaurant AS | Hospitality | 2025 |
| E R H Holding AS | Manufacturing | 2005 |
| E-L Eiendom AS | Real estate | 2019 |
| E. Hoff Holding AS | Real estate | 2020 |
| Eb Bygg AS | Construction | 2001 |
| Ebsa AS | Information & communication | 2019 |
| Ed Trading AS | Wholesale & retail | 2001 |
| Edith Winje Frisørsalong AS | Other services | 2023 |
| Eff Næring AS | Real estate | 2018 |
| Eff Utvikling AS | Real estate | 2014 |
| Eggedosis AS | Professional & scientific | 2009 |
| Ehb Invest AS | | 2021 |
| Ehf Holding AS | Financial services | 2013 |
| Eide Panorama AS | Real estate | 2017 |
| Eidsvaag Berg-Mølgaard Begravelsesbyrå AS | Other services | 1987 |
| Eiendom I Fokus AS | Real estate | 2013 |
| Eiendom Nordvest AS | Real estate | 2007 |
| Eiendom Nordvest I AS | Real estate | 2007 |
| Eiendoms Selskapet Nergt 8 AS | Real estate | 1993 |
| Eilis Holding AS | | 2025 |