| Abbreviation | Definition |
|---|---|
| MRO | Marathon Oil Corporation |
| MRO | USX- Marathon Group |
| MRR | Mid- Atlantic Realty Trust |
| MRX | Medicis Pharmaceutical Corporation |
| MSB | Mesabi Trust |
| MSC | Material Sciences Corporation |
| MSD | M S D W Emerging Market Debt Fund, Inc. |
| MSE | Morgan Stanley Finance, P. L. C. |
| MSF | Morgan Stanley Dean Witter Emerging Markets Fund, Inc. |
| MSK | Grupo Industrial Maseca S. A. de C. V. |
| MSM | M S C Industrial Direct, Inc. |
| MSO | Martha Stewart Living Omnimedia, Inc. |
| MSP | Morgan Stanley Finance, P. L. C. |
| MSR | Muniholdings Insured Fund III, Inc. |
| MST | Mercantile Stores, Inc. (de-listed) |
| MSV | Manufacturers' Services Limited |
| MSV | Morgan Stanley Finance, P. L. C. |
| MSX | MascoTech, Inc. |
| MSY | Morgan Stanley Dean Witter High Yield Fund, Inc. |
| MT | MediTrust |