| Serigrafiservice AS | Trøgstad | 1999 |
| Serigstad AS | Bryne | 2000 |
| Serimax Limited Nuf | Stavanger | 1996 |
| Serimax Welding Services Malaysia SDN BHD Nuf | My-81700 Pasir Gdang Johor | 2024 |
| Seriprint AS | Torød | 1986 |
| Sero AS | Billingstad | 1963 |
| Serodus DKD AS | Oslo | 2025 |
| Servetek Møre Og Romsdal AS | Molde | 2025 |
| Servi-Pack AS | Vikersund | 2024 |
| Servi-Pack Holding AS | Vikersund | 2024 |
| Service AS | Vennesla | 1954 |
| Service Montasje Sveis AS | Oslo | 1999 |
| Service Partner Kopstad AS | Nykirke | 2018 |
| Service Partnerene AS | Os | 2021 |
| Service Solutions AS | Sykkylven | 2023 |
| Service Teknikk AS | Rådal | 2024 |
| Servicegruppen AS | Oslo | 2003 |
| Servicegruppen Da | Oslo | 2003 |
| SERVICES4HIRE AS | Lillestrøm | 2014 |
| Serviceteam AS | Ikornnes | 2017 |
| Serviceteknikk Innlandet AS | Elverum | 2025 |
| Servicon Group AS | Kongsvinger | 2013 |
| Servizi Energia Italia S.P.A. | It-20097 San Donato Milanese Milano | 2022 |
| Servogear AS | Rubbestadneset | 1998 |
| Sescom S.A. Nuf | 80-244 Gdansk | 2017 |
| Setech AS | Loddefjord | 1986 |
| Setera AS | Mo I Rana | 2022 |
| Setesdal Husflid SA | Valle | 1966 |
| Setesdal Laser AS | Byglandsfjord | 2017 |
| Setesdalsylv Eigedom AS | Valle | 1989 |
| Setmek AS | Fauske | 2021 |
| Setred AB | Se-647 30 Mariefred | 2009 |
| Setred Limited | London Ec3V 9Du | 2024 |
| Setred Medical Technology AS | Oslo | 2006 |
| Setskog Trelast AS | Setskog | 2017 |
| Settem Monumentforretning Og Steinindustri AS | Lommedalen | 1987 |
| Seut Maritime AS | Gressvik | 2019 |
| Seven Sea Service AS | Florvåg | 2020 |
| Sevland Holding AS | Sævelandsvik | 2005 |
| Sevland Maritime AS | Sævelandsvik | 2023 |
| Sevlandsvik Slip & Mekaniske Verksted AS | Sævelandsvik | 1973 |
| Sevlandvegen 9 AS | Sævelandsvik | 2023 |
| Sew-Eurodrive AS | Moss | 1977 |
| Sew-Eurodrive GmbH & Co KG | De-76646 Bruchsal | 2021 |
| Seweryn Mucha Sev-Mont | Pl-28100 Owczary | 2022 |
| Sezar Bakeri & Grossist AS | Råde | 2013 |
| Sfera AS | Fiskarstrand | 2019 |
| SG Armaturen AS | Lillesand | 1990 |
| SG Metallteknikk AS | Averøy | 2008 |
| SGC Coating AS | Spydeberg | 2022 |
| SGM Technology AS | Lysaker | 2014 |
| SGN Skis AS | Sogndal | 2012 |
| Sgnskis AS | Fornebu | 2026 |
| SH Mek AS | Hof | 2026 |
| SH Overflate AS | Nesttun | 2022 |
| SH Sveis AS | Grimstad | 2015 |
| Sha Prosjekt AS | Hamar | 1997 |
| Shandon Productions AS | Vettre | 2024 |
| Shanti Doot AS | Oslo | 1988 |
| Sharp Consumer Electronics Poland SP. Z O.O. Nuf | 87-148 Lysomice | 2026 |
| Sharps AS | Jørpeland | 2023 |
| Shawcor Norway AS | Orkanger | 1992 |
| Shell Chemicals UK Ltd | Tananger | 1998 |
| Shellfish Norway AS | Oslo | 1970 |
| Shenger Lastebil Verksted AS | Drammen | 2025 |
| Sherwani Gull Og Sølv AS | Ski | 2025 |
| Sherwin-Williams Norway AS | Skedsmokorset | 1975 |
| Shha Holding AS | Brønnøysund | 2018 |
| Shift Energy Group AS | Stavanger | 2024 |
| Shift Energy Group Holding AS | Stavanger | 2024 |
| Shift Materials AS | Oslo | 2023 |
| Ship & Rig Service AS | Randaberg | 2018 |
| Ship & Rig Service Egersund AS | Randaberg | 2022 |
| Ship Marine Service | Dk-9870 Sindal | 2018 |
| Ship Owner AS | Oslo | 2018 |
| Ship Repair Company Oü | Ee-10113 Tallinn | 2024 |
| Shipnor AS | Angvik | 2013 |
| Shipshape Services AS | Oslo | 1998 |
| Sho AS | Oslo | 2016 |
| Shoe.Com GmbH & Co. GH | 32758 Detmold | 2005 |
| Shoreconnection International AS | Bekkjarvik | 2004 |
| Shortcar AS | Gjerdrum | 2011 |
| Si Motor AS | Harstad | 2014 |
| Si-Glass AS | Saudasjøen | 2020 |
| Sia Ars Magna | Lv-3001 Jelgava | 2015 |
| Sia GK Holding | Oslo | 2011 |
| Sia Norcon Nuf | 3457 Kazdanga | 2011 |
| Sia Olrait Nuf | Lv-5404 Daugavpils | 2025 |
| Sia Reserv | Lv-3851 Broceni | 2010 |
| Sia Vianzhurd Nuf | Lv-5410 Daugavpils | 2025 |
| Siad Macchine Impianti S.P.A. Nuf | It-24126 Bergamo | 2020 |
| Sias AS | Barkåker | 1996 |
| Sibelia Invest AS | Ålesund | 2005 |
| Sibi AS | Os | 1999 |
| Sick AG | De-79183 Waldkirch | 2016 |
| Siddis Cola AS | Stavanger | 2022 |
| Siddis Gelato AS | Stavanger | 2020 |
| Siddis Motor AS | Stavanger | 1990 |
| Siddis Plast AS | Stavanger | 2002 |
| Sider AS | Aure | 2018 |