| Abbreviation | Definition |
|---|---|
| MDS | Midas Group, Inc. |
| MDT | Medtronic, Inc. |
| MDU | M D U Resources Group, Inc. |
| MDU | MDU Resources Group, Inc. |
| MDX | MedPartners, Inc. |
| MDZ | MDS Inc. |
| MEA | Mead Corporation |
| MEC | Midamerican Energy Holdings Company |
| MECPA | MidAmerican Energy Financing I |
| MEE | Massey Energy Company |
| MEE | Merrill Lynch & Company, Inc. |
| MEH | My Evil Henchmen |
| MEL | Mellon Financial Corporation |
| MEN | MuniEnhanced Fund, Inc. |
| MER | Merrill Lynch & Company, Inc. |
| MERPA | Merrill Lynch & Company, Inc. Preferred A |
| MERPB | Merrill Lynch & Company, Inc. Preferred Capital Trust I |
| MERPC | Merrill Lynch & Company, Inc. Preferred Capital Trust II |
| MERPD | Merrill Lynch & Company, Inc. Preferred Capital Trust III |
| MERPE | Merrill Lynch & Company, Inc. Preferred Capital Trust IV |