| Coates Eiendom AS | Real estate | 2005 |
| Coates Invest AS | Real estate | 1945 |
| Coates Kvartalet Parkering AS | Real estate | 2015 |
| Code Zero AS | Professional & scientific | 2015 |
| Coleoptera AS | Construction | 2019 |
| Colombo Invest AS | | 2025 |
| Colosseum Faust AS | Health & social care | 2019 |
| Columbi Micro AS | Information & communication | 1986 |
| Columbi Services AS | Professional & scientific | 2014 |
| Com Islands Invest AS | Financial services | 1998 |
| Communit AS | Professional & scientific | 2024 |
| Compagnie De Transporters De Cereales | Administrative & support | 1999 |
| Compartner Teleteknikk AS | Wholesale & retail | 2001 |
| Computer Accessories Scandinavia AS | Wholesale & retail | 2005 |
| Comstedt Norge AS | Wholesale & retail | 2021 |
| Conta Eiendom AS | Real estate | 1984 |
| Corazón Latino AS | Education | 2024 |
| Cordisi AS | Information & communication | 2000 |
| Corespace AS | Education | 2025 |
| Cort Adelers Gate 8 AS | Real estate | 2023 |
| Cosmediderm AS | Wholesale & retail | 2015 |
| Cottonwood Advisory AS | Professional & scientific | 2023 |
| Cottonwood Capital Management AS | Wholesale & retail | 2023 |
| Cottonwood Holding AS | Professional & scientific | 2023 |
| Creo Utvikling AS | Real estate | 2017 |
| Crescendo Musikk Nuf | Education | 2013 |
| Crossfit Moss AS | Arts & recreation | 2018 |
| Crowd Professional Technologies AS | Information & communication | 2012 |
| CRP Consulting AS | Professional & scientific | 2018 |
| Cryptounion AS | | 2024 |
| Ctelo AS | Information & communication | 2014 |
| Ctph Holding AS | Professional & scientific | 2012 |
| Cultro AS | Wholesale & retail | 2022 |
| Cyberservices AS | Information & communication | 2017 |
| Cycleqa AS | Information & communication | 2026 |
| D G Teknik Norge | Professional & scientific | 2013 |
| D3 System A/S | Wholesale & retail | 2005 |
| Dagligvare Råde Eiendom Ans | Real estate | 2002 |
| Dahles Auto Moss AS | Wholesale & retail | 2023 |
| Dakirk AS | Information & communication | 2021 |
| Damhauggata 7 AS | Real estate | 2011 |
| Damvokteren AS | Real estate | 2015 |
| Dano Prosjekt AS | Real estate | 2020 |
| Dansken Vertshus AS | Hospitality | 2020 |
| Datalec Precision Installations AS | Construction | 2018 |
| Datatilbehør Norge AS | Wholesale & retail | 1998 |
| Dean Førstehjelp AS | Professional & scientific | 2017 |
| Decidetowin AS | Education | 1974 |
| Deka Bygg AS | Construction | 2020 |
| DEKK24 AS | Wholesale & retail | 2012 |
| Del Valle Holding AS | | 2026 |
| Deli-Eiendom AS | Real estate | 2022 |
| Delicato AS | Wholesale & retail | 2018 |
| Demirbas Investment Group AS | | 2026 |
| Demopartner Eiendom AS | Real estate | 2024 |
| Den Gylne Bie AS | Agriculture & fishing | 2021 |
| Den Lille Hjelperen AS | Health & social care | 2003 |
| Designa Norge AS | Professional & scientific | 2004 |
| Designavkris AS | Manufacturing | 2025 |
| Det Gule Huset Moss Da | Health & social care | 2019 |
| Detsika AS | Professional & scientific | 2005 |
| Devig Invest AS | | 2023 |
| Devtec Norway AS | Information & communication | 2017 |
| Different Days AS | Wholesale & retail | 2021 |
| Digit Regnskap AS | Professional & scientific | 2016 |
| Digital Dynamics AS | | 2023 |
| Digital Media AS | Information & communication | 2015 |
| Digital Workforce AS | Information & communication | 2017 |
| Digitalkollektivet AS | Information & communication | 2023 |
| Digitive AS | Information & communication | 2021 |
| Dilling Invest AS | | 2024 |
| Dilling Vanningslag SA | Agriculture & fishing | 1976 |
| Dimi AS | Wholesale & retail | 2019 |
| Din Drivkraft AS | Health & social care | 2018 |
| Din Estetiske Klinikk AS | Health & social care | 2025 |
| Din Løpetrener AS | Education | 2022 |
| Din Maler AS | Construction | 2020 |
| Din Montasjepartner AS | Construction | 2024 |
| Din Veske AS | Wholesale & retail | 1999 |
| Din-Elektriker AS | Construction | 2006 |
| Dirks Transport AS | Transport & logistics | 2020 |
| Discens Consulting AS | | 2017 |
| Ditt Servicesenter AS | Other services | 2017 |
| Dixi Holding AS | Wholesale & retail | 2005 |
| DJ Eiendom Alpha AS | | 2025 |
| DJ Eiendom Beta AS | | 2025 |
| DJ Eiendom Gamma AS | | 2025 |
| DJ International Invest AS | Real estate | 2022 |
| DK Holding 1 AS | Professional & scientific | 2014 |
| DKM Group AS | Information & communication | 2023 |
| DM Rør Og Bygg AS | Construction | 2026 |
| DMG Invest AS | | 2021 |
| Dolan AS | Hospitality | 2022 |
| Domi AS | Administrative & support | 2021 |
| Donaldson Filtration Norway AS | Wholesale & retail | 1988 |
| Dorothea AS | Wholesale & retail | 1991 |
| Dovetail Consulting AS | Professional & scientific | 2025 |
| Dovetail Holding AS | | 2025 |
| Dra Te Moss AS | Real estate | 2021 |
| Dragefrukt AS | | 2025 |