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| Dalo-Service GmbH Nuf | De-79418 Schliengen | 2025 |
| Dalriada Consulting Ltd | Ab517Pb Sauchen | 2009 |
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| Dalsnø AS | Stavanger | 2020 |
| Dalu AS | Hyggen | 2024 |
| Dalveien Invest AS | Mysen | 2005 |
| Daløy/Raadvill AS | Finnøy | 1996 |
| Dam, Vann Og Veg AS | Brumunddal | 2022 |
| Damasol AS | Oslo | 1993 |
| Damby AS | Varhaug | 2010 |
| Dame Og Herre Polet Da | Stabekk | 2000 |
| Damen Offshore & Specialized Vessels B.V. Nuf | 4202 Ms, Gorinchem | 2024 |
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| Damgaard Automatik | Dk-9490 Pandrup | 2023 |
| Damgård AS | Oslo | 2008 |
| Damgård Invest AS | Oslo | 2021 |
| Damhaug Consulting AS | Hamar | 2018 |
| Damia AS | Os | 2018 |
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| Dammann AS | Nesodden | 2022 |
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| Damodden AS | Vear | 2025 |
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| Dandelions AS | Oslo | 2021 |
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| Danes Mekaniska AB Nuf | 841 32 Ånge | 2020 |
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| Danica Capital AS | Langhus | 2021 |
| Daniel Gangsø AS | Oslo | 2018 |
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| Daniela Filipp Interiørarkitektur AS | Hafrsfjord | 2021 |
| Danielk Consultancy AS | Tananger | 2023 |
| Daniels Gaards-Service AS | Gamle Fredrikstad | 2023 |
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| Danielsen Photography AS | Saupstad | 2008 |
| Danish Technological Institute in Norway | Dk-2300 Taastrup | 2018 |
| Danlauren Projects Limited | Ab12 4Lw Aberdeenshire | 2014 |
| Danmac Aps | 3460 Birkerød | 2012 |
| Danmag Entreprenad AB | Se - 791 77 Falun | 2020 |
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| Dannevig Invest AS | Oslo | 2024 |
| Danny Buoy Ltd | Middlebrough Clevland Ts5 5Qa | 2019 |
| Danobat S. Coop Ltda | Es-Elgoibar 20870 | 2017 |
| Danoco AS | Drammen | 1991 |
| Danol Holding AS | Oslo | 2021 |
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| Danser Videre AS | Oslo | 2020 |
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| Dansk Ingeniør Teknik Aps | 5250 Odense Sv | 2009 |
| Dansk Miljørådgivning | 8680 Ry | 2012 |
| Dansk Trykinspektion Aps | Dk-8300 Odder | 2017 |
| Dantakst AS | Sørvik | 2022 |
| Dante AS | Stavanger | 2012 |
| Dante Invest AS | Asker | 2011 |
| Danu Engineering Limited Nuf | Ab10 1Ut Aberdeen | 2023 |
| Danube HRT AS | Slemmestad | 2024 |
| Danwadaag Invest AS | Søreidgrend | 2020 |
| Dapa AS | Svolvær | 2009 |
| Dapen AS | Høvik | 2021 |
| Dapes AS | Billingstad | 2013 |
| Darabi AS | Oslo | 2022 |
| Daracom AS | Frei | 2019 |
| Darelogic AS | Oslo | 2025 |
| Dark Angel Holding AS | Hølen | 2014 |
| Dark Arkitekter AS | Oslo | 2014 |
| Dark Bergen AS | Bergen | 2020 |
| Dark Blue Umbrella Ltd | Canterbury Ct2 7Pg, Kent | 2019 |
| Dark Chamber AS | Oslo | 2020 |
| Dark Design Group AS | Oslo | 1988 |
| Dark Fredrikstad AS | Fredrikstad | 2015 |
| Dark Holding AS | Alta | 2023 |
| Dark Horse AS | Steinsland | 2005 |
| Dark Nordfjord AS | Nordfjordeid | 2020 |
| Dark Prosjekt AS | Oslo | 2009 |
| Dark Stavanger AS | Stavanger | 2018 |
| Darka AS | Oslo | 2025 |