Vi har så langt registrert 19 632 rederier
| Navn | Grunnlagt | | O. Wathnes Arvinger, Stavanger | |
| O. Wettre, Kristiania | |
| O. Wikborg, Drammen | |
| O. Wirum & A. Johannesen, Kristiansund | |
| O. Wirum, Kristiansund | |
| O. W. Normann Nilsen, Straume | |
| O. W. Ring, Fredrikstad | |
| O/Y Ernst Sohn, Helsingford, Finland | |
| Paal Aarseth, Ålesund | |
| Paal Harald Leinebø, Leinøy, Ålesund | |
| Paal Wilson, & Co. Hop, Bergen | |
| Paal Wilson Management A/S, Bergen | |
| Paal Wilson, Minde, Bergen | |
| Paal Wilson Shipping A/S, Bergen | |
| P. A. Andreassen, Farsund | |
| P. A. Bakken, Svellingen, Trondheim | |
| P. & A. Campbell Ltd. | |
| P. A. Christensen,( Barfod ), Langesund | |
| P. A. Christensen, Langesund | |
| Pacific - Atlantic Steam Ship Co. v/ States Steam Ship Co. | |
| Pacific Lighterage Corp., San Francisco, California, USA | |
| Pacific Steam Nav.Co., Liverpool,U.K. | |
| P. A. & C. M. Grøn, Sandefjord | |
| Paco Tankers Inc., Pennsylvania | |
| P. A. D. Nielsen, Kragerø | |
