| Abbreviation | Definition |
|---|---|
| MRVC | M R V Communications, Inc. |
| MRVT | Miravant Medical Technologies |
| MRWY | Mid State Raceway, Inc. |
| MRXX | Marex.Com, Inc. |
| MRYP | Merry Land Properties, Inc. |
| MSAC | Maryland Student Academy |
| MSBC | Mission Bancorp |
| MSBF | M S B Financial, Inc. |
| MSBHY | Mitsubishi Corporation |
| MSBK | Mutual Savings Bank, F. S. B. |
| MSCA | M S Carriers, Inc. |
| MSCC | MicroSemi Corporation |
| MSCK.PK | Mass Clink, Inc. |
| MSCM | Madras Cements, LTD. |
| MSCP | Medscape, Inc. |
| MSCS | MSC Software Corporation |
| MSCX.PK | Members Services Corporation |
| MSDA | Masada Security Holdings, Inc. |
| MSDXO | Mason Dixon Capital Trust II |
| MSDXP | Mason Dixon Capital Trust |