Vi har så langt registrert 19 632 rederier
| Navn | Grunnlagt | | P. A. Falchenberg, Kragerø | |
| P. A. Grenager & C. Mostue, Fredrikshald | |
| P. A. Grønn & H. C. Michelsen, Sandefjord | |
| P. A. Grøn, Sandefjord | |
| P. A. Grøn, Tønsberg | |
| P. A. Heuch, Kragerø | |
| P. A. H. Rømer, Kragerø | |
| P. A. Jensen & L. Bøgh Henriksen, Kristiania | |
| P. A. Johannessens Eftf, Larvik | |
| Palestine Maritime Lloyd Ltd., London | |
| Palm Beach Cruises,Panama | |
| Palm Star Lines Pte. Ltd., Singapore | |
| P. A. & L. P. Grenager, Fredrikshald | |
| P. Alvær, B. Rein, J. Mathiesen, H. & Chr. Eriksen, Bergen | |
| P. Amlie, Haugesund | |
| P. A. Musæus, Kristiania / Oslo | |
| P. A. Musæus, Ålesund | |
| Pan-Alantic S.S. Corp, Wilmington, Delaware | |
| Panama Mail Steam Ship Co. | |
| Panamanian Freighters ( Wallem & Co.mngrs) | |
| Panama Railroad Co. Inc | |
| Panama Shipping Co. Ltd. v/ Booth American Shipping Corp. 17 Battery Place, New York 4, NY. USA | |
| Panama Transport Co. (Standard Oil Co.) Panama | |
| Pan American Petroleum & Transport Co., Wilmington, Del | |
| Pan-Atlantic S.S. Corp, Wilmington, Delaware | |
