| Abbreviation | Definition |
|---|---|
| INR | INSILCO Corporation |
| INT | World Fuels Services Corporation |
| INV | American Residential Investment Trust |
| IO | Input/ Output, Inc. |
| IOCR.PRA | Omnicare Capital Trust Preferred A |
| IOF | Income Opportunities Fund 1999 |
| IOM | Iomega Corporation |
| ION | Ionics, Inc. |
| IP | International Paper Company |
| IPCPA | Illinois Power Company Preferred A |
| IPCPB | Illinois Power Company Preferred B |
| IPCPC | Illinois Power Company Preferred C |
| IPCPD | Illinoin Power Company Preferred D |
| IPCPM | Illinois Power Company Preferred M Capital, L. P. |
| IPCPT | Illinois Power Company Preferred T Financing I |
| IPG | InterPublic Group Companies, Inc. |
| IPL | Ipalco Enterprises, Inc. |
| IPP | International Paper Capital Trust I |
| IPS | Ipsco, Inc. |
| IPS | Ipsco, Incorporated |