| Abbreviation | Definition |
|---|---|
| MAGI | cNaughton Apparel Group |
| MAGI | McNaughton Apparel Group |
| MAGN | Magainin Pharmaceuticals, Inc. |
| MAGS | Magal Security Systems, LTD. |
| MAGV | Magnavision Corporation |
| MAGZ | Magnum Sports & Entertainment, Inc. (delisted) |
| MAHI | Monarch Services, Inc. |
| MAHN | Mid-Atlantic Home Health Network |
| MAII | Medical Alliance, Inc. |
| Mail.Com, Inc. | |
| MAIN | Main Street & Main, Inc. |
| MAIR | Mesaba Holdings, Inc. |
| MAKR | Maker Communications, Inc. |
| MALL | Creative Computers, Inc. |
| MAME | Mobile America Corporation of Florida |
| MAMH | Mammatech Corporation |
| MANA | Manatron, Inc. |
| MANC | Manchester Equipment Company, Inc. |
| MANH | Manhattan Associates, Inc. |
| MANS | Mansur Industries, Inc. |