| Abbreviation | Definition |
|---|---|
| IVLU | Ivarans Rederei A/S |
| IVRR | Indian Valley RailRoad |
| IWPZ | Iowa Power Service |
| IXEU | Interox Quimica |
| IXEU | Interox Quimica SA |
| IXWU | Interox Chemicals |
| IXWU | Interox Chemicals Limited |
| JAAU | Jordan Bromine |
| JACX | Johnstown America Corporation |
| JAIX | JAIX Leasing Corporation |
| JALX | JAIX Leasing Corporation |
| JANX | JAN Inc. |
| JANX | JAN Incorporated |
| JAX | Jacksonville Amtrak Station |
| JB | Jungfrau Bahnen |
| JBCX | James B. Clow & Sons |
| JBHU | J. B. Hunt Transport |
| JBHU | J. B. Hunt Transport, Incorporated |
| JBHZ | J. B. Hunt Transport |
| JBHZ | J. B. Hunt Transport Incorporated |