| Strev AS | Valestrandsfossen | 2007 |
| Stricct Travel AS | Blomsterdalen | 2019 |
| Stride Norge AS | Fredrikstad | 2018 |
| Strings and Skins AS | Kragerø | 2024 |
| Stroll AS | Ålesund | 2024 |
| Stromma Tourism AS | Oslo | 2017 |
| Strongerpeople AS | Sarpsborg | 2019 |
| Structured Business and Management AS | Larvik | 2023 |
| Struktur Messer & Display AS | Stavanger | 2001 |
| Strukturas Equipment AS | Porsgrunn | 2025 |
| Struprog AB | Se-183 63 Täby | 2018 |
| Struts Consult AS | Lier | 2024 |
| Stryn Aktivitetslodge AS | Stryn | 2021 |
| Stryn Arrangement AS | Stryn | 2005 |
| Stryn Endorfin AS | Stryn | 2021 |
| Stryn Vaktmester Service AS | Stryn | 2002 |
| Strålfors PLC | Cornwell Tr15 1Sh | 2013 |
| Stråtveitvegen SA | Nedre Vats | 1973 |
| Strøjobber AS | Strømmen | 2024 |
| Strøm Drift AS | Hønefoss | 2025 |
| Strøm Maskin & Utstyr AS | Hitra | 2026 |
| Strømberg Drift AS | Oslo | 2026 |
| Strømmen Drift Og Utleie AS | Nes I Ådal | 2008 |
| Strømsnes Utleieservice AS | Søreidgrend | 2025 |
| STS Alpereiser | Se 411 08 Göteborg | 2016 |
| STS Miljøvask AS | Stavanger | 2024 |
| STS Vaktmestertjenester AS | Sistranda | 2021 |
| Sts-Consulting | Dk-7200 Grindsted | 2005 |
| Stsa Holding AS | Vikhammer | 2017 |
| Stsselnes AS | Åfjord | 2025 |
| Stubbefreserne.No Da | Rykkinn | 2010 |
| Stubbeng Consulting AS | Tromsø | 2020 |
| Studentconsulting Norge AS | Oslo | 2006 |
| Studentconsulting Norge Bemanning AS | Oslo | 2013 |
| Studio Pryd AS | Tolvsrød | 2024 |
| Studio Spornes AS | Færvik | 2014 |
| Studio Spornes Kultur AS | Færvik | 2022 |
| STUDIO360 AS | Fyllingsdalen | 2021 |
| Studmatch AS | Ranheim | 2020 |
| Stuedal Holding AS | Slemmestad | 2023 |
| Stuenes AS | Lakselv | 2013 |
| Stuerent AS | Sandnes | 2015 |
| Stunt Da | Tiller | 2000 |
| Stupetårnet Utvikling AS | Hamar | 2019 |
| Stuvodden AS | Bekkestua | 2005 |
| Styrebistand AS | Oslo | 2009 |
| Styreinformasjon AS | Oslo | 1985 |
| Ståle Hestad AS | Aureosen | 2014 |
| Ståle Og Svein Konsulenten Da | Båstad | 1990 |
| Stödig Bemanning AS | Paradis | 2006 |
| Stödig Crewing I AS | Paradis | 1997 |
| Stødig Stillas AS | Stavanger | 2025 |
| Støen Service AS | Gjerdrum | 2026 |
| Støen Service Og Utleie AS | Gvarv | 2025 |
| Stønt AS | Bøfjorden | 2024 |
| Støt AS | Bergen | 2023 |
| Støtengruppen AS | Askim | 2006 |
| Støttespilleren AS | Grålum | 2015 |
| Su Renhold AS | Sola | 2018 |
| Sub Farmandstredet AS | Arendal | 2011 |
| Sub Norge AS | Arendal | 2011 |
| Subc Engineering Limited | Aberdeen Ab12 3Ax Scotland | 2011 |
| Subkultur AS | Mo I Rana | 2021 |
| Subsea 7 Crewing Limited | Sm2 5Bn Surrey | 1995 |
| Subsea 7 Crewing Services Pte. Ltd. | Singapore 059608 | 2010 |
| Subsea 7 International Contracting Limited Nuf | London W6 7Dl | 2014 |
| Subsea 7 Navica AS | Stavanger | 2012 |
| Subsea 7 Offshore Resources (UK) Limited | Gb-Aberdeenshire Ab32 6Fe, Scotland | 2016 |
| Subsea 7 Pipeline Production Ltd Nuf | Stavanger | 1995 |
| Subsea 7 Shipping Limited | Stavanger | 2012 |
| Subsea 7 Vessel Owner AS | Stavanger | 2012 |
| Subsea Engineering & Technical Services Ltd | Aberdeenshire Ab23 8Xv | 2013 |
| Subsea Nor AS | Stokmarknes | 2001 |
| Subsea Personnel Support Limited | Suite 31, Don House, 30-38 Main Str | 2013 |
| Subsea Services AS | Tinn Austbygd | 1998 |
| Subsea Tooling AS | Haugesund | 2014 |
| Subsea Toolpool Nord AS | Tromsø | 2012 |
| Subsea Wellpartner Limited | Stavanger | 2014 |
| Subseapeople AS | Haugesund | 2022 |
| Subtec Pro Ltd | Glasgow G2 1Bp Scotland | 2018 |
| Succedo AS | Oslo | 2014 |
| Sucon AS | Nyborg | 2007 |
| Sula Cageball AS | Langevåg | 2025 |
| Sula Touring AS | Mauseidvåg | 2025 |
| Suldal Hagepartner AS | Sand | 2017 |
| Suldal Service AS | Suldalsosen | 2018 |
| Suldalsbussen AS | Suldalsosen | 2017 |
| Sulerud AS | Sørum | 2013 |
| Sullestad Holding AS | Skreia | 2005 |
| Sullestad Support AS | Skreia | 2007 |
| Sulzer (Aberdeen) Limited | Ellon Ab41 9Rf | 2022 |
| Sumitomo Corporation of Americas | Ny 10172 New York | 2023 |
| Summit 365 AS | Oslo | 2024 |
| Summit&Ride Adventures AS | Sandnes | 2026 |
| Sun and Smile Journeys AS | Brumunddal | 2026 |
| Sun Autopack & Production AS | Oslo | 2003 |
| Sun-Maid Growers of California | Oslo | 2000 |
| Sunbæk Invest | Dk-5000 Odense | 2010 |
| Sunde Drift AS | Skei I Jølster | 2007 |
| Sunde Hageservice AS | Sola | 1986 |