| Abbreviation | Definition |
|---|---|
| MATT | Matthews Studio Equipment Group |
| MATVY | Matav Cable Systems Media |
| MATW | Matthews International Corporation |
| MATX | Matrix Pharmaceutical, Inc. |
| MAUI | Hawaiilove.Com, Inc. |
| MAVEE | Michigan Avenue Financial Group, Inc. (delisted) |
| MAVK | Maverick Tube Corporation |
| MAWI | M and A West, Inc. |
| MAXC | Maxco, Inc. |
| MAXE | Max & Ermas Restaurants, Inc. |
| MAXE | Max & Erma's Restaurants, Incorporated |
| MAXF | Maxcor Financial Group, Inc. |
| MAXI | Maxicare Health Plans, Inc. |
| MAXM | Maxim Pharmaceuticals, Inc. |
| MAXS | Maxwell Shoe Company, Inc. |
| MAXY | Maxygen, Inc. |
| MAYS | J W Mays, Inc. |
| MAZL | Mazel Stores, Inc. |
| MBAH | MBA (Mechanical Breakdown Administrators) Holdings, Inc. |
| MBAY | Mediabay, Inc. |