| Abbreviation | Definition |
|---|---|
| IMAHF | International Mahogany |
| IMAN | IManage, Inc. |
| IMAT | Imatron, Inc. |
| IMAX | IMax Corporation |
| IMBR | IM, Inc. |
| IMCC | I M C Mortgage Company |
| IMCI | Infinite Group, Inc. |
| IMCL | Imclone Systems Corporation (delisted) |
| IMCO | I M P C O Technologies, Inc. |
| IMCO | International Midget Class Organization |
| IMCX | ImageMatrix Corporation |
| IMDC | Inamed Corporation |
| IMDD | Inmedica Development Corporation |
| IMDS | Imaging Diagnostic Systems |
| IMEC | Imatec, LTD. |
| IMGN | Immunogen, Inc. |
| IMGX | ImageX.com, Inc. |
| IMIC | Industrial Matematik International |
| IMIGP | Indiana Michigan Power Company |
| IMIIQ | Intelligent Medical Imaging, Inc. (in bankruptcy) |