We have so far registered 19,743 shipping companies
| Name | Founded | | Swayne & Hoyt Ltd., San Francisco, California, USA | |
| S. Wesmann, Kristiania | |
| S. Wesseltoft. Jørgensen, Skien | |
| S. Westmann, Kristiania | |
| S. Wiborg jr., Kragerø | |
| Swiftlight Steam Ship Corp., Wilmington | |
| Swiftscout Steam Ship Co.v/(Marine Transport Lines) | |
| Swire Seabed A/S, Bergen | |
| Swire Seabed Shipping A/S, Bergen | |
| Swiss Shipping Co. Ltd., Basel, Sveits | |
| Swiss War Transport Office, Basel | |
| S. W. Marcussen, Arendal | |
| Sword S.S. Line Inc., New York, USA | |
| Sydvestor A/S, Alta | |
| Syltøy, Jakob M., Fjell | |
| Synnøve & Terje Bøe, Åkrehamn | |
| Syrena K/S, Kokstad, Bergen | |
| Syver Blindheim, Åsestranda | |
| Syver Jensen, Fredrikstad | |
| Syvert Andreassen Wathne, Brekne | |
| Syvert A. Watne, Brekne | |
| Syvert Jansen, Farsund | |
| Syvert Knutsen, Sælør | |
| Syvertsen & Co.,Farsund | |
| Syvertsen, Einar & A. Abrahamsen, Farsund | |
