| Abbreviation | Definition |
|---|---|
| IPX | Interpool, Inc. |
| IPX | Interpool, Incorporated (de-listed) |
| IQC | Morgan Stanley Dean Witter |
| IQI | Morgan Stanley Dean Witter |
| IQM | Morgan Stanley Dean Witter |
| IQN | Morgan Stanley Dean Witter |
| IQT | Morgan Stanley Dean Witter |
| IR | Ingersoll Rand Company |
| IRE | Ireland Bank |
| IRF | International Rectifier Corporation |
| IRL | Irish Investment Fund, Inc. |
| IRM | Iron Mountain, Inc., of Pennsylvania |
| IRPI | Ingersoll Rand Company Financing II |
| IRS | Irsa Inversiones y Represent |
| IRT | I R T Property Company |
| IRT | IRT Property Company |
| IS | Interim Services, Inc. |
| ISA | Santa Isabel, S. A. |
| ISH | International Shipholding Company |
| ISL | First Israel Fund, Inc. |