| Rognan Rørservice Holding AS | Rognan | 2016 |
| Rogne Bygg AS | Beitostølen | 1996 |
| Rogne Utvikling AS | Beitostølen | 2005 |
| Rognerud Bygg & Takst AS | Harstad | 2008 |
| Rognli Bygg AS | Vesterøy | 2017 |
| Rognmo AS | Tranby | 1990 |
| Rognmo Automasjon AS | Bjørnevatn | 2000 |
| Rognmo Graveservice AS | Moen | 2023 |
| Rognstad Byggteknikk AS | Jessheim | 2014 |
| Rognstad Eiendom AS | Hurdal | 2005 |
| Rognstad VVS AS | Hurdal | 1998 |
| Rognså Skogsbilveglag SA | Sjøvegan | 2011 |
| Rognsåsen Va-Utbygging SA | Skien | 2025 |
| Rogstad & Odden AS | Folldal | 2017 |
| Rogstad Montasje AS | Egersund | 2016 |
| Roha Maskin AS | Vettre | 2026 |
| Rohms AS | Oslo | 2012 |
| Roho Bygg-Holding AS | Oslo | 2019 |
| Rok Bygg AS | Skotselv | 2021 |
| Rok Holding AS | Øvre Årdal | 2005 |
| Rok Zbigniew | Oslo | 2009 |
| Rokade Industrier Da | Arendal | 2003 |
| Rokko AS | Herdla | 2022 |
| Rokne Elektro AS | Os | 2019 |
| Rokne Maskin AS | Voss | 2008 |
| Rokseth Holding AS | Rissa | 2021 |
| Rokstad Rør & Klima AS | Rossfjordstraumen | 2003 |
| Rolan Bygg Og Anlegg AS | Skien | 2016 |
| Roland B AS | Holmestrand | 2022 |
| Roland Fjellsprengning AS | Finsland | 2023 |
| Roland Gullberg | 830 76 Stugun | 2016 |
| Rolands Bygg AS | Kristiansand S | 2011 |
| Rolands Holding AS | Skjervøy | 2020 |
| Rolf Andreassen AS | Rolvsøy | 1992 |
| Rolf Andreassen Eiendom AS | Rolvsøy | 2011 |
| Rolf Andreassen Holding AS | Rolvsøy | 2005 |
| Rolf Arne Nummedal AS | Vik I Sogn | 2021 |
| Rolf Borge Skorsteinsrehabilitering AS | Skien | 1998 |
| Rolf Døli Holding AS | Skarnes | 2005 |
| Rolf Edvardsen Maskinentreprenør AS | Herøy | 2007 |
| Rolf Eide Jensen Sanitær AS | Nesodden | 2012 |
| Rolf Erik Nilsen Murerforretning AS | Drammen | 2014 |
| Rolf Flekkerud AS | Hallingby | 2014 |
| Rolf Grohs AS | Skien | 2015 |
| Rolf H Hansen AS | Kristiansand S | 2003 |
| Rolf Levorsen AS | Tunhovd | 1998 |
| Rolf Og Ronny Maskin AS | Ljørdalen | 2000 |
| Rolf Skarpnord AS | Varteig | 1992 |
| Rolf Storbråten & Sønn AS | Siggerud | 1973 |
| Rolf Thomsen AS | Holum | 2004 |
| Rolf-Tore Albrigtsen AS | Kvaløya | 2007 |
| Rolfs Graving Og Planering AS | Skien | 2021 |
| Rolfsen Eiendomservice AS | Larvik | 2019 |
| Rolfstad AS | Stokke | 2024 |
| Roll Bygg Ou | Ee-93818 Kuressaare, Saaremaa | 2017 |
| Rolland Vedlikehold AS | Kalandseidet | 2015 |
| Rolland VVS AS | Indre Arna | 2024 |
| Rolls-Royce Solutions Ruhstorf GmbH Nuf | De-94099 Ruhstorf A.D. Rott | 2025 |
| Rolo Holding AS | Rindal | 2018 |
| Rolstad Miljø AS | Vinstra | 2023 |
| Rolv Snare AS | Kongsvinger | 1982 |
| Rolvsøy Bygde Service Da | Rolvsøy | 2008 |
| Rolvsøy Bygg AS | Sarpsborg | 2010 |
| Rolvsøy Elektriske AS | Rolvsøy | 2026 |
| Rolvsøy Rør AS | Rolvsøy | 2025 |
| Rolvsøy Veiservice AS | Tufjord | 2021 |
| Rom & Kulde AS | Rælingen | 2019 |
| Rom Bygg Og Farge AS | Ridabu | 2024 |
| Roman Cladding Nuf | Milton Keynes Mk10 9Sg | 2026 |
| Roman Falkowski Roman | 78-600 Walcz | 2007 |
| Roman Ideal Concept AS | Søfteland | 2022 |
| Roman Mrzyglocki | 84-200 Wejherowo | 2006 |
| Roman Paszkiewicz Neoprbygg AS | Namsos | 2024 |
| Roman Sojka | 43-608 Jaworzno | 2007 |
| Roman Szymaniak - Usl. Stolarskie | 80-126 Gdansk | 2006 |
| Romaness AS | Oslo | 2006 |
| Romarheim & Rivenes AS | Alversund | 2023 |
| Romarheim AS | Alversund | 2018 |
| Romarheim Entreprenør AS | Alversund | 2011 |
| Romarheim Tunnel AS | Alversund | 2025 |
| Romasbygg AS | Hønefoss | 2017 |
| Romec Elektro AS | Eggedal | 1993 |
| Romerike & Hadeland Blåseisolering AS | Dal | 2025 |
| Romerike Anleggsdrift AS | Kløfta | 1992 |
| Romerike Anleggsservice AS | Årnes | 2020 |
| Romerike Armering AS | Trøgstad | 2009 |
| Romerike Armering Invest AS | Kongsvinger | 2022 |
| Romerike Bad & Snekkerservice AS | Fjerdingby | 2025 |
| Romerike Bad AS | Jessheim | 2012 |
| Romerike Balkongmontasje AS | Jessheim | 2004 |
| Romerike Betonggulv AS | Jessheim | 2024 |
| Romerike Betongsaging AS | Hurdal | 1998 |
| Romerike Bygg & Bolig AS | Harestua | 2009 |
| Romerike Bygg & Vedlikehold AS | Kløfta | 2019 |
| Romerike Bygg AS | Rælingen | 2024 |
| Romerike Bygg Og Anlegg AS | Vormsund | 2026 |
| Romerike Bygg Og Eiendom AS | Eidsvoll | 2026 |
| Romerike Bygg Og Ventilasjon AS | Hvam | 2017 |
| Romerike Byggmesterforretning AS | Gardermoen | 2020 |
| Romerike Byggteknikk AS | Jessheim | 2025 |