| Charles's Wain AS | | 2026 |
| Charlies Sushi AS | Hospitality | 2024 |
| Chiasma AS | Health & social care | 2013 |
| Christian Hartz AS | Wholesale & retail | 2023 |
| Christiansen Urologi AS | Health & social care | 2017 |
| Cicero Invest AS | Real estate | 2008 |
| Cirka Holding AS | Financial services | 2005 |
| City Market AS | Hospitality | 2015 |
| Claus Morten Pedersen Holding AS | | 2017 |
| Clinic Barbora AS | Other services | 2013 |
| Club Forza AS | Wholesale & retail | 2023 |
| Clutch Media AS | Information & communication | 2005 |
| Coba-Eiendom AS | Real estate | 2015 |
| Compend AS | Information & communication | 2023 |
| Condico Invest AS | | 2008 |
| Consensus Eiendomsutvikling AS | Real estate | 2010 |
| Contra Invest AS | Real estate | 2005 |
| Contribo AS | Manufacturing | 1994 |
| Cora Service Og Megling AS | Administrative & support | 2018 |
| Core Facts Construction AS | Professional & scientific | 2025 |
| Core Facts Holding AS | Professional & scientific | 2025 |
| Core-Tech AS | Professional & scientific | 2013 |
| Corebar AS | Education | 2020 |
| Corecom Digitalbyrå AS | Professional & scientific | 2011 |
| Corotek Nordic AS | Construction | 2015 |
| Covision Technology AS | Information & communication | 2007 |
| CPS Invest AS | | 2020 |
| Credo Bolig AS | Construction | 2007 |
| Credo Boligutvikling AS | Real estate | 2007 |
| Credo Gruppen AS | Construction | 1991 |
| Credo Vest AS | Real estate | 2019 |
| Cremone AS | | 2025 |
| Critter Software AS | Information & communication | 2026 |
| Crossroads Tattooing AS | Real estate | 2021 |
| Cryd AS | Professional & scientific | 2024 |
| Cryo Invest AS | | 2008 |
| Cryogenetics AS | Professional & scientific | 2002 |
| Cumulus Hamar AS | Wholesale & retail | 2012 |
| Curotek Consulting AS | | 2019 |
| Cut Throat Barbershop AS | Other services | 2015 |
| Cut'N Go Hamar AS | Other services | 2019 |
| Cxflow AS | Professional & scientific | 2023 |
| D Invest AS | Real estate | 2021 |
| D. City Holding AS | Real estate | 2017 |
| D.J Invest AS | | 2022 |
| Dalom AS | Information & communication | 2013 |
| Damhaug Consulting AS | Professional & scientific | 2018 |
| Danneskjold AS | Wholesale & retail | 2013 |
| Das Kapital AS | Professional & scientific | 2007 |
| Data Center Resource Group AS | Professional & scientific | 2006 |
| Databygg Nuf | Professional & scientific | 2008 |
| Daya AS | Information & communication | 2020 |
| DCK AS | Real estate | 2005 |
| DCK Holding AS | | 2018 |
| Dekketøyet AS | Wholesale & retail | 2016 |
| Delesalg AS | Wholesale & retail | 2003 |
| Delivia AS | Transport & logistics | 2017 |
| Delphi Holding AS | Health & social care | 2023 |
| Deltaquack AS | Information & communication | 2017 |
| Demeter Holding AS | Real estate | 2019 |
| Dental Bona Fide AS | Health & social care | 2013 |
| Dentatus Eiendom AS | Real estate | 2021 |
| Designer Bolig AS | Construction | 2013 |
| Det Hele Mennesket AS | Health & social care | 2022 |
| Dettvardett Ans | Wholesale & retail | 2009 |
| Didrik Holding AS | Information & communication | 2021 |
| Digifarm AS | Information & communication | 2020 |
| Digili AS | Information & communication | 2020 |
| Digital Team Solutions AS | Information & communication | 2023 |
| Digitaliseringsfabrikken AS | Information & communication | 2006 |
| Din Holding AS | Health & social care | 2022 |
| Din Investment AS | Health & social care | 2023 |
| Din Vei AS | Other services | 2026 |
| Dino Holding AS | | 1998 |
| Disen Legesenter AS | Health & social care | 2013 |
| Distrikt 23 AS | Hospitality | 2016 |
| Ditt Apotek Grandsenteret AS | Wholesale & retail | 2017 |
| Ditt Apotek Storhamarsenteret AS | Wholesale & retail | 2013 |
| Dividendo AS | | 2023 |
| Dm-Auto AS | Wholesale & retail | 2021 |
| Dobra Invest AS | | 2024 |
| Domus Nostrum AS | Real estate | 2021 |
| Dormilona AS | | 2021 |
| Dorthe Jensen Legetjenester AS | Health & social care | 2011 |
| DR. Celinda Almaas AS | Health & social care | 2021 |
| Drag AS | Real estate | 2018 |
| Drim AS | Information & communication | 2000 |
| Driv Prosjektstyring AS | Professional & scientific | 2015 |
| Drive Trafikkskole AS | Education | 2013 |
| Drosch Dental AS | Health & social care | 2025 |
| Drømmehuset Hamar AS | Real estate | 2020 |
| Drømmekjøkkenet Hamar AS | Wholesale & retail | 2012 |
| DS Bygg & Eiendom AS | | 2022 |
| Dyplink AS | Information & communication | 2021 |
| Dyre Østby Advokatfirma AS | Professional & scientific | 1991 |
| Dyre Østby Invest AS | Real estate | 2008 |
| E-Torget AS | Wholesale & retail | 2021 |
| E.S Eiendom AS | Real estate | 2025 |
| East Africa Invest AS | Wholesale & retail | 2012 |
| Eazy-E AS | | 2025 |