| Strand Guitars AS | Stavanger | 2020 |
| Strand Holding AS | Trondheim | 1989 |
| Strand Stillas AS | Fiskå | 2006 |
| Strand Unikorn AS | Moelv | 1974 |
| Strand Unikorn Eiendom AS | Moelv | 1999 |
| Stranda Bakeri Holding AS | Stranda | 2013 |
| Stranda Stålindustri AS | Stranda | 1997 |
| Strandberg Stein AS | Tjodalyng | 1991 |
| Strandberg Utemiljø AS | Tjodalyng | 2021 |
| Strandbergs Stanseknivfabrikk A/S | Halden | 1970 |
| Strandli AS | Lonevåg | 2008 |
| Strandman Holding AS | Ålesund | 2014 |
| Strandplast AS | Trondheim | 2008 |
| Strandval Pottemakeri AS | Kolvereid | 2006 |
| Strandvik Invest AS | Tjodalyng | 2005 |
| Strandvik Transportservice AS | Furnes | 2021 |
| Strange Music Ans | Oslo | 1984 |
| Strategy Mill Norway AS | Oslo | 2021 |
| Straume Handlaft AS | Rysstad | 2004 |
| Straumen Bil AS | Vestnes | 1989 |
| Straumsalt AS | Inderøy | 2024 |
| Straumsheim Glass Og Fasade AS | Straumgjerde | 2023 |
| Streamlines AS | Eiksmarka | 2020 |
| Strendo Maskinteknikk AS | Nesbyen | 2022 |
| Strendo Trevare AS | Ål | 2005 |
| String Furniture AB Nuf | Se-21613 Limhamn | 2020 |
| Stromek AS | Askvoll | 2026 |
| Struct Steel Engineering Limited | Fermanagh Bt94 5Ft Northern Ireland | 2023 |
| Strukturplast Holding AS | Sandane | 2023 |
| Stryn Betong AS | Loen | 1976 |
| Strysse Mek AS | Veggli | 2013 |
| Stryvo - Bismo AS | Skjåk | 2013 |
| Stryvo AS | Stryn | 2008 |
| Stryvo Invest AS | Stryn | 2014 |
| Stryvo Oslo AS | Oslo | 1979 |
| Stråndbygg Sag Og Høvleri AS | Selbustrand | 2022 |
| Strængbetong AB | 120 08 Stockholm | 1995 |
| Strætåsen Akevittlag AS | Braskereidfoss | 2023 |
| Strømmen Bakeri AS | Strømmen | 2019 |
| Strømmen Dentallab AS | Strømmen | 1994 |
| Strømmen Dreieverksted AS | Skedsmokorset | 2010 |
| Strømseng & Sagvang Drift Ans | Tynset | 2024 |
| Strømsholm Fiskeindustri AS | Tustna | 1981 |
| Strønes Snekkerverksted AS | Trøgstad | 2015 |
| STS Services AS | Rørvik | 2015 |
| Stuart Dalrymple CNC Engineering Limited | Kilmarnock Ka3 7Ds Scotland | 2019 |
| Studio 5 Grafisk AS | Slependen | 2003 |
| Studio AS | Flateby | 1924 |
| Studio Dugleik AS | Holmsbu | 2018 |
| Studio Einang AS | Nøtterøy | 2023 |
| Studio Kalit AS | Oslo | 2021 |
| Studio Mudder AS | Horten | 2023 |
| Studio Oak AS | Mjøndalen | 2025 |
| Studio Sati AS | Oslo | 2020 |
| Studio Sæbø AS | Kristiansand S | 2024 |
| Studio Verkstedet Da | Kristiansand S | 2017 |
| Studiotre AS | Hemsedal | 2025 |
| Stulen Holding AS | Langesund | 2009 |
| Stur Services AS | Vennesla | 2024 |
| Sturdy AS | Oslo | 2018 |
| Sture Mekaniske AS | Bodø | 2020 |
| Stusselig AS | Flekkefjord | 2020 |
| Styreg Norge AS | Holmestrand | 2018 |
| Styro Nor AS | Tana | 2023 |
| Styvan Drift AS | Lovund | 2026 |
| Styve Maskinistservice AS | Svelgen | 2016 |
| Stål Betong & Rør AS | Hammerfest | 2012 |
| Ståland Landbruk Og Maskin AS | Dalholen | 2024 |
| Stålbygg AS | Kråkerøy | 2014 |
| Stålbyggeren AS | Åkrehamn | 1997 |
| Ståleriet AS | Sandefjord | 2020 |
| Stålesen Mek Verksted AS | Vanse | 1991 |
| Stålfantomet Erlingsmed AS | Eidsnes | 2026 |
| Stålkonstruksjon AS | Hakadal | 2007 |
| Stålkontroll Norge AS | Bergen | 2023 |
| Stålmannen AS | Nybergsund | 2017 |
| Stålprodukter AS | Langevåg | 2025 |
| Stålprosjekt AS | Andebu | 2009 |
| Stålsenteret AS | Torvastad | 2008 |
| Stålshop AS | Avaldsnes | 2011 |
| Stålteknikk AS | Bryne | 1987 |
| Ståltjenester Ans | Spillum | 2003 |
| Stålvarer AS | Stranda | 1998 |
| Står Støtt AS | Kongsberg | 2022 |
| Stølen Kjøttforedling AS | Tjørhom | 2023 |
| Støren Betong AS | Støren | 2015 |
| Støren Granitt AS | Støren | 2020 |
| Støren Treindustri AS | Støren | 1992 |
| Størksen Rustfri Industri AS | Godvik | 2006 |
| Størseth Holding AS | Hegra | 2005 |
| Støtek | Dk-6500 Vojens | 2019 |
| Støv Keramikk AS | Sandnes | 2021 |
| Su Casa Coffee Roasters AS | Fagerstrand | 2018 |
| Su Service AS | Kolltveit | 2021 |
| Sub Optimal AS | Skedsmokorset | 2025 |
| Subfarm AS | Måløy | 2021 |
| Subsea Composite Solutions AS | Sæbøvågen | 2005 |
| Subsea Maskinering AS | Hokksund | 2008 |
| Subshore.No AS | Stord | 2013 |
| Subwing AS | Kristiansand S | 2011 |