| Abbreviation | Definition |
|---|---|
| MERX | Merix Corporation |
| MESA | Mesa Air Group, Inc. |
| MESG | Messagemedia, Inc. |
| MESH | Media Source, Inc. |
| META | Metalec International, Inc. |
| METF | Metropolitan Financial Corporation |
| METFO | Metropolitan Financial Corporation |
| METFP | Metropolitan Financial Corporation Preferred |
| METFV | Metronet Communications Class B Non-Voting |
| METG | M E T A Group, Inc. |
| METHA | Methode Electronics, Inc Class A |
| METHB | Methode Electronics, Inc Class B |
| METLF | Metallica Resources, Inc. |
| METR | Meteor Industries, Inc. |
| METRW | Meteor Industries, Inc. Warrants |
| METS | Met Coil Systems Corporation (de-listed) |
| MEXP | Miller Exploration Company |
| MFBC | M F B Corporation |
| MFBP | M And F Bancorp |
| MFCB | Michigan Financial Corporation (delisted) |