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| Ramsland Pukk AS | Bjerkreim | 1999 |
| Ramsrud AS | Svene | 2016 |
| Rana Gruber AS | Mo I Rana | 1989 |
| Rana Nickel AS | Lakselv | 2022 |
| Randøy Stein AS | Hjelmeland | 1997 |
| Ranes Pukk AS | Surnadal | 1986 |
| Rapbjørg Pukkverk AS | Melhus | 2018 |
| Rare Earths Norway AS | Ulefoss | 2017 |
| Raumagrus AS | Åndalsnes | 2020 |
| Raven Invest AS | Bekkestua | 2007 |
| Raymond Resources Ltd | Ab15 4Yl Aberdeen | 2009 |
| RB Invest AS | Stamsund | 2000 |
| RDS Holding AS | Lyngdal | 2013 |
| Reach Subsea Shipping AS | Haugesund | 2024 |
| Red Spider Technology Ltd | Sandnes | 2006 |
| Reddal AS | Grimstad | 1989 |
| Reel Group Limited | Dyce, Aberdeen Ab21 0Bg | 2011 |
| Reipå Holding AS | Reipå | 2023 |
| Reipå Knuseri AS | Reipå | 2023 |
| Reisa Grus AS | Birtavarre | 2001 |
| Rekefjord Stone AS | Hauge I Dalane | 2006 |
| Rem Saltire AS | Fosnavåg | 2011 |
| Rem Saltire Holding AS | Fosnavåg | 2021 |
| Rem Saltire International AS | Fosnavåg | 2021 |
| Rem Subsea AS | Fosnavåg | 2012 |
| Remotely Operated Systems Engeneering Ltd | Kw 16 3Dp Scotland | 2011 |
| Remotion AS | Sandnes | 2015 |
| Rena Pukk Og Grus AS | Rena | 2012 |
| Rennebu Granitt AS | Rennebu | 1991 |
| Repparfjord Sand AS | Kvalsund | 1985 |
| Repsol Exploracion S.A. | 28045 Madrid | 2015 |
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| Repsol Perpetual Norge AS | Stavanger | 2002 |
| Resitec AS | Kristiansand S | 1999 |
| Reutz Consulting AS | Stavanger | 2014 |
| Rex Geo Solution AS | Oslo | 2018 |
| Rieber & Søn AS | Bergen | 1918 |
| Rig Hercules Contractor AS | Oslo | 2024 |
| Rig Linus Contractor AS | Oslo | 2022 |
| Rig Partner Project AS | Tananger | 2018 |
| Right Viking AS | Oslo | 1989 |
| Rigmar Services Norwegian Branch | Aberdeen Ab10 1Dq | 2018 |
| Ringerike Pukk Og Sand AS | Hønefoss | 2010 |
| Ringknuten Pukkverk AS | Kristiansand S | 1999 |
| Ringsaker Pukk AS | Gaupen | 2011 |
| Risør Pukkservice AS | Risør | 2022 |
| RM Consultants AS | Sandnes | 2014 |
| Rm-Lh Izola Proizvodnja Promet in Storitve Doo | 6320 Portoroz - Portorose | 2011 |
| RN - Holding AS | Bryne | 2020 |
| Robusto Agder AS | Birkeland | 2005 |
| Robusto Holding AS | Birkeland | 2013 |
| Rockwell Automation Ltd | Essex Cm9 4La | 1995 |
| Rockwood Consulting AS | Stavanger | 2022 |
| Roe Investeringslag Ans | Akkerhaugen | 2016 |
| Roemex Ltd | Aberdeen Ab1 4Yd Scotland | 1995 |
| Rombak Miljøpark AS | Narvik | 2025 |
| Rombak Pukkverk Narvik AS | Narvik | 1993 |
| Rosanes Gass AS | Nøtterøy | 2017 |
| Ross Murray Consultancy Ltd | Glasgow G12 9Ll Scotland | 2005 |
| Roste Invest AS | Steinsholt | 2019 |
| Rov & Dykker Service AS | Lyngdal | 2002 |
| Rowan Norway Limited Nuf | Ab12 3Ga Aberdeen | 2010 |
| Roxar Ltd | Aberdeen Ab12 3Bg Scotland | 1995 |
| Roy Champion | Norfolk Nr13 6Hz England | 1995 |
| RPG Norge AS | Stavanger | 2019 |
| RPS Australia West Pty Ltd | Au-Qld 4006 Fortiude Valley | 2019 |
| Rudsbygd Steinbrudd AS | Fåberg | 2014 |
| Rudshøgda Pukkverk AS | Kongsvinger | 2012 |
| Rugsland Sandtak AS | Birkeland | 1999 |
| Rutine Invest AS | Godvik | 2005 |
| Ryfylke Stein AS | Hjelmeland | 1989 |
| Ryntveit Eiendom AS | Akkerhaugen | 2008 |
| Røkenes Maskin AS | Sortland | 2002 |
| Røyken Granitt AS | Krøderen | 1992 |
| Røyrvikkalk AS | Limingen | 1993 |
| Røyseth Maskin AS | Naustdal | 2013 |
| S&L Consulting | Ch-1752 Villars-Sur-Glane | 2009 |
| S-Energy AS | Oslo | 2022 |
| S-N Terminal AS | Oslo | 2012 |
| S. Lillestrøm AS | Alvdal | 2007 |
| Safekick Americas LLC | Texas 77449 | 2017 |
| Safety Leaders AS | Melhus | 2023 |
| Saga Offshore Partners AS | Stavanger | 2013 |
| Sagemines SAS | Fr - 42120 Parigny | 2015 |
| Sagli Grus AS | Roverud | 1990 |
| Saipem Drilling Norway AS | Stavanger | 2012 |
| Saipem Limited Norway Branch Nuf | Stavanger | 2011 |
| Saipem Norge AS | Stavanger | 2010 |
| SAIPEM S P A filial av utenlandsk foretak NUF | Stavanger | 1995 |
| Sajas Invest AS | Oslo | 2002 |
| Samland & Skarstein Holding AS | Herand | 2023 |
| Sand & Debri Cleanup AS | Straume | 2023 |
| Sandex AS | Sandnes | 2020 |
| Sandtransport AS | Hommersåk | 1994 |
| Sandvik Mining and Construction Sverige AB | Se-811 33 Sandviken | 2015 |
| Sapu AS | Hønefoss | 2005 |
| Sarens AS | Steinkjer | 2007 |
| Sarens Steel Erectors BV | 3316 Bt Dordrecht | 2015 |
| Sarepta Oil AS | Stavanger | 2016 |