| Abbreviation | Definition |
|---|---|
| MPA | Muniyield Pennsylvania Fund |
| MPH | Championship Auto Racing Team |
| MPL | Minnesota Power, Inc. |
| MPO | Motivepower Industries, Inc. |
| MPP | General Cigar Holdings, Inc. |
| MPR | Met Pro Corporation |
| MPS | Modis Professional Services, Inc. |
| MPT | Municipal Partners Fund II, Inc. |
| MPV | MassMutual Participation Investors |
| MPY | Maytag Corporation |
| MQT | MuniYield Quality Fund II, Inc. |
| MQY | MuniYield Quality Fund, Inc. |
| MRA | Meritor Automotive, Inc. |
| MRD | MacDermid, Inc. |
| MRE | Medco Research, Inc. |
| MRF | Mentor Income Fund, Inc. |
| MRG | Mortons Restaurant Group, Inc. |
| MRK | Merck & Company, Inc. |
| MRL | Marine Drilling Company, Inc. |
| MRN | Medical Staffing Network |