Vi har så langt registrert 19 632 rederier
| Navn | Grunnlagt | | Simonsen & Slang A/S,Oslo | |
| Simonsen,Søren & Salve,Snig,Mandal | |
| Simonsen,Th.,Odda | |
| Simon & Theodor Briseid, Feda | |
| Simon W. Marcussen, Lyngør | |
| Simrad A/S, Horten | |
| Simrad Norge A/S, Horten | |
| Simrad Sub Sea A/S, Horten | |
| Sinclair Refining Co, Inc. New York/Wilmington | |
| Singapore Straits Steam Ship, Co. Ltd, Singapore | |
| Singa Ship Management, Grimstad | Siste halvdel 1900 tallet |
| Singa Ship Managment A/S, Bergen / Oslo | |
| Singel & Grus A/S, Sandnes | |
| Sinus Bulk Shipping A/S, Sandnes | |
| Sir Edward Wilshaw K.C.M.G., London | |
| Sir Eric Ohlson, UK | |
| Sissel Aune, Melandsjø, Svolvær | |
| Sivert Abrahamsen, Brevik | |
| Sivert Bakke, Bergen | |
| Sivert Bjørnereim, Sandøy, Molde | |
| Sivert Fjørtoft, Ålesund | |
| Sivert Gjerde, Kopervik / Stavanger | |
| Sivert & Gudmund Fjørtoft , Fjørtoft, Ålesund | |
| Sivert Julshavn, Molde | |
| Sivert Jystad, Namsos | |
