| Songa Offshore Rig 2 AS | Stavanger | 2014 |
| Songa Offshore Rig 3 AS | Stavanger | 2014 |
| Sound Oceanic LLC | 77002 Houston Texas | 2017 |
| Source Energy AS | Oslo | 2017 |
| South East Marine AS | Herføl | 2004 |
| Spec Ltd | Birmingham B17 0Dr England | 1995 |
| Specialist Maintenance Service | Aberdeen Ab21 0Gc Scotland | 1999 |
| Spirit Energy Norway AS | Stavanger | 2017 |
| Spirit Energy Resources Limited | Birkshire Sl4 5Gd | 2004 |
| Spirit Norway Holding AS | Stavanger | 2006 |
| Sprova Pukk AS | Steinkjer | 1999 |
| Spydeberg Miljødeponi AS | Spydeberg | 2012 |
| SQL Systems Europe BV | 3029 Ak Rotterdam | 1995 |
| SRK Exploration Services Limited | Oslo | 2020 |
| SRS Holding AS | Skei I Jølster | 2005 |
| Stalbud Tarnow Sp.Z.O.O. | Pl-33-121 Bogumilowice | 2013 |
| Standal Knuseverk AS | Storestandal | 2000 |
| Stange Gruppen AS | Drammen | 1985 |
| Stange Industri AS | Hønefoss | 2009 |
| Stange Pukk AS | Stange | 2016 |
| Stat Marine S.A.S | Stavanger | 2005 |
| Statholding AS | Stavanger | 1999 |
| Statoil Iran AS | Stavanger | 2001 |
| Statoil SP Gas AS | Stavanger | 2002 |
| Statoil Zagros Oil and Gas AS | Stavanger | 1998 |
| Staven Grus AS | Myre | 2020 |
| Stavtinden Holding AS | Myre | 2018 |
| Steindalen AS | Stjørdal | 2014 |
| Steinkjerstein AS | Steinkjer | 2017 |
| Steinli Grus AS | Fannrem | 2018 |
| Steinsvik Olivine AS | Lauvstad | 2010 |
| Stena Don Drilling Limited | London Sw1A 1Re England | 2024 |
| Stena Drilling Limited | Aberdeen Ab12 3Bg Scotland | 1995 |
| Stenberg Oil & Gas Technologi AB | Se-302 73 Halmstad | 1998 |
| Stenproduksjon AS | Eiksmarka | 2023 |
| Stewart & Stevenson Ltd | Stavanger | 1998 |
| Stikla Pukkverk Og Entreprenør AS | Båstad | 2006 |
| Still Shining Distillers Ltd | Ab51 5Jn Inverurie, Aberdeenshire | 2019 |
| Stimwell Services Limited Nuf | Nr31 7Ra Great Yarmouth | 2009 |
| Stokkan Stein Og Pukk AS | Inderøy | 2012 |
| Stokkan Stein Og Pukk Da | Inderøy | 2011 |
| Stolt-Nielsen Holding AS | Oslo | 2016 |
| Stonetech AS | Oslo | 2018 |
| Store Norske Gruvedrift AS | Longyearbyen | 2016 |
| Stranddalen Sand AS | Alta | 2006 |
| Strathdell Ltd | Ab56 4Nq Buckie | 2018 |
| Strindfjorden AS | Frosta | 2018 |
| Strisland Grus AS | Konsmo | 2016 |
| Stryn Pukk AS | Stryn | 1991 |
| Studedalen Deponi AS | Kristiansand S | 2015 |
| Ståle Holdahl Maskin & Transport AS | Gravdal | 2012 |
| Støleheia Pukkverk AS | Vennesla | 2006 |
| Sub Aqua Technology Sat AS | Bergen | 1985 |
| Sub Sea Services AS | Stavanger | 2000 |
| Subcap AS | Loddefjord | 2019 |
| Subsea 7 (UK Service Company) Limited | Aberdeenshire Ab32 6Jl Scotland | 2002 |
| Subsea 7 Holding Norway AS | Stavanger | 2001 |
| Subsea 7 Norway AS | Stavanger | 1985 |
| Subsea Insulation AS | Sæbøvågen | 2014 |
| Subseapartner AS | Haugesund | 2013 |
| Subseasteve Limited Nuf | Ab21 0Jh, Aberdeen, Scotland | 2026 |
| Suleskard Masseuttak AS | Mandal | 2007 |
| Sulzer Pumps (UK) Limited | Leeds Ls11 8Br England | 1995 |
| Suncor Energy Services Inc | Calgary Alberta T2P 3E3 | 2017 |
| Sundland Torv Og Jord AS | Stokke | 1978 |
| Sundown Invest AS | Kongsberg | 2018 |
| Superior Energy Services (Norway) AS | Sandnes | 2012 |
| Supply Chain Management Services AS | Florø | 2012 |
| Sveggen NP Drift AS | Eide | 2021 |
| Svelviksand AS | Klokkarstua | 1915 |
| Svene Pukkverk AS | Svene | 2020 |
| Swerock AS | Verdal | 2001 |
| Sxsubsea Limited | Rg5 3Bl Woodley | 2010 |
| Sydvaranger Drift AS | Kirkenes | 2016 |
| Sydvaranger Eiendom AS | Kirkenes | 2016 |
| Sydvaranger Mining AS | Kirkenes | 2020 |
| Sylte Eiendom Ans | Norddal | 1992 |
| Syltemoa Sandtak AS | Valldal | 1996 |
| Synnfjell Grustak AS | Dokka | 2016 |
| Synnfjell Massetak AS | Dokka | 2019 |
| Store Norske Spitsbergen Kulkompani AS | Longyearbyen | 1916 |
| Sætermyrberget Massetak AS | Stange | 2016 |
| Sætnan Miljødeponi AS | Stjørdal | 2026 |
| Sørlandspukk AS | Lindesnes | 2007 |
| Sørlie Mining Invest AS | Lørenskog | 2015 |
| Sørlie Pukk AS | Spydeberg | 2021 |
| Sørungen Pukk Og Grus AS | Selbu | 2012 |
| T&T Sistemi SRL | It-52021 Bucine | 2017 |
| Tactical Adjustment Systems Ltd | Ll53 8Ye Gwynedd | 2018 |
| Targs AS | Sandnes | 2017 |
| Tasik Toba Subsea AS | Oslo | 2014 |
| Tasta Drilling AS | Stavanger | 2017 |
| Tco Group AS | Indre Arna | 2001 |
| Tco Norway AS | Indre Arna | 2023 |
| TDC Underwater Inspection Ltd | Lancashire Pr3 0Jj | 2021 |
| TDW Offshore Services AS | Stavanger | 1998 |
| Te Aktiva AS | Bergen | 2013 |
| Teako Minerals Norway AS | Eide | 2023 |
| Techdof Brasil AS | Bergen | 2013 |
| Technip Canada Ltd | Lysaker | 2006 |