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| Donachie Design and Technical Services Limited | Middelsbrough Ts8 0Rz | 2015 |
| Donald Mitchell Engineering Solutions Ltd | Liff Dd2 5Pf Dundee | 2023 |
| Done Marketing Norway | Sunnyvale Ca 94089 | 2019 |
| Donetek AS | Ålgård | 2022 |
| Donibristle Engineering Ltd | Glasgow G2 4Bg Scotland | 2023 |
| Donira AS | Skedsmokorset | 2015 |
| Donnattiva AS | Kristiansand S | 2014 |
| Donnelly Structural Design Ltd | Lanarkshire Ml1 1Pj Scotland | 2016 |
| Donny G Design AS | Stavanger | 2023 |
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| Dorah AS | Jar | 2013 |
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| Dornier Construction and Service GmbH | De-17033 Neubrandenburg | 2022 |
| Dornier Construction and Services S.R.L. | Ro-900527 Constanta | 2022 |
| Doro AB | Kråkerøy | 2008 |
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| Dosetec Exact OY | Oslo | 2016 |
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| Dosina Translations AS | Oslo | 2019 |
| Dotcode AS | Oslo | 2017 |
| Dotm Holding AS | Oslo | 2020 |
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| Double Happiness AS | Oslo | 2016 |
| Double Income AS | Saksvik | 2015 |
| Double Think AS | Randaberg | 2017 |
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| DPK Consultants AS | Oslo | 2013 |
| Dplan AS | Namsos | 2008 |
| Dpoint AS | Rasta | 2021 |
| DPP Holding AS | Mo I Rana | 2016 |
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| Dptech AS | Sandnes | 2013 |
| DQ Oil and Gas Limited | Prescot L35 0Ny | 2020 |
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| DR. Kugod AS | Rennebu | 2012 |
| DR. Wolfgang Schwarz | 63589 Linengericht | 2009 |
| Dr.Ing Bergan AS | Oslo | 2022 |
| Dr.Ing Knut Wiik AS | Langesund | 2017 |
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| Dr.Ing. Jan Ove Holmen AS | Oslo | 2017 |
| Dr.Ing. Kjell Øren AS | Oslo | 2008 |
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| Dr.Ing. Torbjørn Kjoberg AS | Oslo | 2019 |
| Draape Holding AS | Oslo | 2023 |
| Drabeng AS | Straumsgrend | 2026 |
| Draco Enterprise AS | Hvalstad | 2019 |
| Dracon AS | Fredrikstad | 1994 |
| Dradit AS | Oslo | 2025 |
| Dragados SA Nuf | Oslo | 2024 |
| Dragdemand AS | Oslo | 2025 |
| Drage, Blanco & Wedler Da | Stavanger | 2005 |
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| Drageland AS | Hauge I Dalane | 2018 |
| Drageland Holding AS | Hauge I Dalane | 2013 |
| Dragonhead AS | Oslo | 2000 |
| Draja AS | Trondheim | 2021 |
| Draka U.K. Limited | De21 4Zh | 2010 |
| Drake Street AS | Oslo | 2020 |
| Draki AS | Kongsberg | 2025 |
| Drakkar AS | Stavanger | 2026 |
| Drakkar Innsikt AS | Alta | 2025 |
| Drakkar Solutions AS | Stavanger | 2026 |