| Shelf Drilling Resources Limited Nuf | Ky1-1110 George Town | 2024 |
| Shell Australia Pty Ltd | Au-Perth Wa 6000 | 2024 |
| Shell India Markets Private Limited | Tananger | 2012 |
| Shell Kazakhstan B.V. | Kz-0100000 Astana, Nura | 2026 |
| Shell Polska SP. Z.O.O. Oddzial W Krakowie | Pl-30-392 Krakow | 2023 |
| Shellinor AS | Vestre Jakobselv | 1991 |
| Shepherd Sound Systems AS | Oslo | 2025 |
| Shimmy AS | Sandefjord | 2020 |
| Shine Cleaning Service Da | Oslo | 2017 |
| Shine Nordic AS | Tromsø | 2026 |
| Shine Renhold Khan AS | Fredrikstad | 2020 |
| Shinywings AS | Bergen | 2017 |
| Ship to Shore Rigging & Lifting Services | Ts14 6Nb North Yorkshire | 2018 |
| Shipcon Limited | Pl-80-557 Gd | 2012 |
| Shipcoon SP Z.O.O. | 80557 Gdansk | 2018 |
| Shipkon Nuf | Skudeneshavn | 2009 |
| Shipnor Maskinpark AS | Angvik | 2018 |
| Shipyard Services Ltd | Sc- Mahe | 2007 |
| Shire Marine Limited | Gb-Warwickshire Cv37 6Lf | 2015 |
| Sho Entertainment AS | Oslo | 2024 |
| Shoe-D-Vision Norge AS | Oslo | 1976 |
| Show-Teknikk Event AS | Lierstranda | 2013 |
| Showbizz Norge | Dk-2920 Charlottenlund | 2022 |
| Showfactory Da | Lørenskog | 2023 |
| Showhouse AS | Oslo | 2024 |
| Showweb AS | Oslo | 2022 |
| SHS Tech AS | Sandnes | 2024 |
| Si Drift AS | Revetal | 2026 |
| Si-Fra Da | Senjahopen | 2009 |
| Sia "Ultramarin Services" Nuf | Lv-1005 Riga | 2026 |
| Sia Brigg Resources | Lv-1013 Riga | 2020 |
| Sia Eddi Group | Lv-5052 Ogres | 2022 |
| Sia Gokstad Hus Nuf | Lv-2114 Olaines | 2013 |
| Sia Labie Koki | Åkrehamn | 2011 |
| Sia Ramaijs | Lv1082 Riga | 2012 |
| Sia RSK Nord Nuf | Lv-1046 Riga | 2026 |
| Siauciukenas Alvydas | Ateities G. 24 Vilnius | 2010 |
| Sibilla AS | Haslum | 2019 |
| Sic Processing GmbH | Oslo | 2006 |
| Sicaro AS | Hamar | 2023 |
| Sicilyexplorer | 93100 Caltanissetta | 2013 |
| Sicubi AS | Hvalstad | 1996 |
| Sicurity AS | Oslo | 2019 |
| Sidc LT Uab Nuf | Skjervøy | 2014 |
| Siddis AS | Stavanger | 2018 |
| Siddis Bemanning AS | Kleppe | 2014 |
| Sidestilt 1905 AS | Stabekk | 2025 |
| Sidestilt AS | Løten | 2023 |
| Sido Facilities AS | Kristiansund N | 2025 |
| Sieco Ans | Oslo | 1997 |
| Siekacz Vaktmester Service AS | Larvik | 2012 |
| Siemens Energy Austria GmbH | At-1210 Vienna | 2021 |
| Siemens Energy B.V. | 2382Bl Zoeterwoude | 2020 |
| Siemens Energy D.O.O. | Hr-10000 Zagreb | 2025 |
| Siemens Energy KFT | Hu - 1158 Budapest | 2020 |
| Siemens Energy Limited | Frimley Surrey Gu16 8Qd | 2021 |
| Siemens Energy OY | Fi-02600 Espoo | 2023 |
| Siemens Energy S.R.L. | Ro-050762 Bucharest | 2024 |
| Siemens Energy Sp.Z.O.O. | Pl-03-821 Warszawa | 2020 |
| Siemens Eood | Bg-Sofia 1309 Ilinden | 2017 |
| Siemens Gamesa Renewable Energy KFT | Hu-1143 Budapest | 2017 |
| Siemens Gamesa Renewable Energy Limited | Oslo | 2022 |
| Siemens Limited | In-400018 Mumbai | 2021 |
| Siemens Mobility Limited | London Nw1 1Ad England | 2021 |
| Siemens Mobility S.R.O. | Sk-984104 Bratislava | 2022 |
| Siemens Rail Automation S.A.U. | Es-28760 Tres Cantos (Madrid) | 2016 |
| Siemens S.A. | Es-28760 Tres Cantos (Madrid) | 2015 |
| Siemens S.P.A. | I-20126 Milano | 2010 |
| Siemens Schweiz AG | 8047 Zuerich | 2010 |
| Siemens Technology and Services Private Limited | In-Mumbai 400018 Maharashtra | 2017 |
| Siemens WLL | Qa-21757 Doha | 2020 |
| Sierra Leone People's Party Norway Branch | Sl-Freetown Western Area | 2003 |
| Siesta Utleie AS | Kongsvinger | 2026 |
| Sifanor AS | Etne | 1997 |
| Sifo AS | Sola | 2022 |
| Sig Holdings AS | Skudeneshavn | 2017 |
| Sig Industrirør Aps | 6800 Varde | 2000 |
| Sig Record 43 Ltd Nuf | N146Qh, London, Southgate | 2010 |
| Sigdal Renhold AS | Tyristrand | 2012 |
| Sigdal Utleiesenter Da | Prestfoss | 2006 |
| Sigdal Utvikling AS | Eggedal | 2001 |
| Siggerud Video Og Kiosk Hollevik Ans | Siggerud | 1993 |
| Siggis Travel and F&B Service AS | Larvik | 2022 |
| Sigma Energy & Marine AB Nuf | Se-411 18 Göteborg | 2013 |
| Sigmundsen Holding AS | Ålgård | 2016 |
| Signal Partners AS | Oslo | 2026 |
| Signaturreise AS | Trondheim | 2014 |
| Signorelli AS | Lysaker | 2013 |
| Sigridnes Aktivitet AS | Åmli | 2014 |
| Sigrids Renhold AS | Tyristrand | 1989 |
| Sigurdsgate 7 AS | Larvik | 1991 |
| Sigurdson AS | Bergen | 2016 |
| Sigurdur Guttormsson Transport AS | Jessheim | 2017 |
| Sigval Bergesen | Stavanger | 1887 |
| Sigvalley SA | Ski | 2025 |
| Sigvefiks AS | Stavanger | 2017 |
| Sihmore AS | Horten | 2023 |
| Sija Service AS | Smøla | 2025 |
| Sikker Bemanning AS | Oslo | 2009 |
| Sikker Jobb Service AS | Bjørkelangen | 2021 |