| 1 | OBC | Olympic Broadcasting Services | | GB | AVCODES |
| 2 | OBCC | OLENICK BROS COAL CO | | | SCAC3 |
| 3 | OBCC | O B C NORTHWEST INC | | | SCAC4 |
| 4 | OBCG | O'BRIEN CARTAGE CO | | | SCAC3 |
| 5 | OBCG | OBRIEN CARTAGE CO | | | SCAC4 |
| 6 | OBCI | OCEAN BULK CARRIERS INC, | | | SCAC3 |
| 7 | OBCI | OCEANIC BULK CARRIERS LTD | | | SCAC4 |
| 8 | OBCU | N.V. COBO CONSTRUCTION | | SME | BIC |
| 9 | OBCU | ORBICON | | | SCAC3 |
| 10 | OBCU | ORBICON | | | SCAC4 |
| 11 | OBCX | The Neatsfoot Oil Refineries Corp. | 7/1935-4/1938 | | NAKINA |
| 12 | OBCX | The Neatsfoot Oil Refineries Corp. | Apr-38 | | NRHS |
| 13 | OBCX | NEATSFOOT OIL REFINERIES CORP. | | | PWRC |
