| SSL Rør Sandvik Sætre & Leikanger Da | Gursken | 1997 |
| SSM Invest AS | Kristiansand S | 2017 |
| SSM Marine AS | Ågotnes | 2025 |
| SSP Holding AS | Rolvsøy | 2021 |
| SST Slitskyddesteknik AB | Se-653 50 Karlstad | 2017 |
| SSV Holding AS | Straume | 2020 |
| SSV Kranteknikk AS | Straume | 2020 |
| ST Olavs Eiendom AS | Trondheim | 1987 |
| Staak AS | Misje | 2015 |
| Staal & Svejse-Service V/Per Madsen | Dk-5762 Vester Skerninge | 2024 |
| Staal & Sønn AS | Tistedal | 1979 |
| Staaldesigner AS | Ask | 2012 |
| Staale Lie AS | Sandnes | 2010 |
| Staas AS | Melhus | 2005 |
| Stabbursbakeriet Da | Jaren | 1998 |
| Stabbursdalen Vilt AS | Indre Billefjord | 2012 |
| Stabil NDT AS | Fiskum | 2018 |
| Stabinor AS | Nannestad | 1979 |
| Stad Betong AS | Stadlandet | 2012 |
| Stad Industrier AS | Stadlandet | 2020 |
| Stad Kystbygg AS | Stadlandet | 2016 |
| Stadhav AS | Selje | 1984 |
| Stadler Deutschland GmbH | De-13158 Berlin | 2009 |
| Stadler Rail Schweiz AG Nuf | 9565 Bussnang | 2010 |
| Stadler Rail Service UK Limited | Liverpool Merseyside L3 1Bp England | 2024 |
| Stadler Service Nederland B.V. Nuf | 7323Am Apeldoorm | 2026 |
| Stadler Service Norway AS | Oslo | 2017 |
| Stadservice AS | Raudeberg | 1998 |
| Stadt AS | Gjerdsvika | 2001 |
| Stadt Holding AS | Gjerdsvika | 2009 |
| Stadt Naval AS | Gjerdsvika | 2022 |
| Stadyard AS | Raudeberg | 2012 |
| Stafimo AS | Ålesund | 2022 |
| Stahl Cranesystems GmbH Nuf | De-74653 Künzelsau | 2026 |
| Stahl-Mont SP Zoo SP. K. | Pl-66-436 Slonsk | 2017 |
| Stal Complex - Dariusz Tiszer | 84217 Szemud | 2014 |
| Stalman Montasje Limited Nuf | Se-444 55 Stenungsund | 2024 |
| Stalprodukt-Wamech Spolka Z Ograniczona Odpowiedzialnoscia Nuf | Pl-32-700 Bochnia | 2021 |
| Stam S.P.A. | 31050 Ponzano Veneto (Tv) | 2023 |
| Stamas Solutions AS | Stavanger | 2001 |
| Stamfoot AS | Os | 2023 |
| Stamol S.R.O. Nuf | 934 03 Levice | 2015 |
| Standard Measuring Equipment AS | Kurland | 2020 |
| Stang Maskin AS | Blomsterdalen | 1986 |
| Stange Auto AS | Stange | 2016 |
| Stange Jernstøperi AS | Stange | 1997 |
| Stange Kjøkken Og Bad Interiør Ans | Ådalsbruk | 2003 |
| Stangeland Mølle AS | Ålgård | 1989 |
| Stangeland Mølle Holding AS | Ålgård | 2021 |
| Stanges Gårdsprodukter AS | Tønsberg | 1994 |
| Stangeskovene Bjørnstad Bruk AS | Tistedal | 2018 |
| Stangeskovene Industri AS | Aurskog | 2016 |
| Stangnes Marineservice AS | Vestby | 2012 |
| Stangvik Mek Og Maskinservice AS | Stangvik | 2018 |
| Stansefabrikken Solutions AS | Grålum | 1979 |
| Stanseformfabrikken AS | Halden | 1994 |
| Stansemakeren AS | Borgenhaugen | 1984 |
| Stantek AS | Kongsvinger | 1978 |
| Stantek Eiendom AS | Kongsvinger | 2004 |
| Stantek Holding AS | Kongsvinger | 2005 |
| Stappan Sjøprodukter AS | Gjesvær | 2000 |
| Stapu Sveisekonstruksjoner AS | Trondheim | 1999 |
| Star Boats Norway AS | Nesbru | 2010 |
| Star Solutions AS | Tjøme | 2021 |
| Stari AS | Stranda | 2023 |
| Stark Electric AS | Lørenskog | 2018 |
| Stark Fish Oü | Ee-10133 Tallinn Harju Country | 2017 |
| Stark Future S.L. | Es-08830 Barcelona | 2023 |
| Stark Power Oü Nuf | Ee-10133 Tallinn | 2025 |
| Starlinger & Co GmbH | At-1060 Vienna | 2020 |
| Staro Tech AS | Florø | 2010 |
| Stas Ølsafteri AS | Dovre | 2026 |
| Stasjonsstua Da | Drangedal | 1999 |
| Staslin Kjøtt AS | Hamar | 2019 |
| Stateofmind AS | Oslo | 2017 |
| Static Seals AS | Kongsberg | 2023 |
| Statkraft Hydrogen Mo AS | Oslo | 2022 |
| Statkraft Tofte AS | Tofte | 2000 |
| Statland Mek. & Marine AS | Nord-Statland | 2011 |
| Staur Aqua AS | Trondheim | 2007 |
| Staur Fjellbakeri AS | Tolga | 2005 |
| Staur Holding AS | Soknedal | 2006 |
| Staur LS SPV 2 AS | Trondheim | 2020 |
| Staur LS SPV III AS | Trondheim | 2022 |
| Staur LS SPV1 AS | Trondheim | 2015 |
| Stav Mat AS | Fredrikstad | 2024 |
| Stava Mekaniske Verksted AS | Veavågen | 1997 |
| Stavagarden AS | Stol | 2018 |
| Stavanger Automatservice Da | Stavanger | 1999 |
| Stavanger Blikk AS | Stavanger | 2012 |
| Stavanger Båtverksted AS | Hundvåg | 2014 |
| Stavanger Conditori - Avd. Godesetdalen AS | Stavanger | 2024 |
| Stavanger Conditori - Avd. Tananger AS | Tananger | 2024 |
| Stavanger Kaffebrenneri AS | Stavanger | 2007 |
| Stavanger Markise Og Persienne Fabrikk AS | Stavanger | 2000 |
| Stavanger Mekaniske AS | Stavanger | 2006 |
| Stavanger Mikrobryggeri AS | Stavanger | 2017 |
| Stavanger Plast Og Lakk AS | Hundvåg | 2022 |
| Stavanger Seilmaker AS | Hundvåg | 2018 |
| Stavanger Steel AS | Jørpeland | 2016 |