| Abbreviation | Definition |
|---|---|
| MLG | MetLife, Inc. |
| MLG | Musicland Stores Corporation (delisted) |
| MLI | Mueller Industries, Inc. |
| MLK | Matlack Systems, Inc. |
| MLM | Martin Marietta Materials, Incorporated |
| MLM | Martin Marietta Mtls Inc |
| MLR | Miller Industries, Inc., of Tennessee |
| MLS | Mills Corporation |
| MLT | Mitel Corporation |
| MM | Mutual Risk Management, LTD. |
| MMA | Municipal Mortgage & Equity, LLC |
| MMC | Marsh & McLennan Companies, Inc. |
| MMC | Marsh & McLennan Companies, Incorporated |
| MMH | Meristar Hotels & Resorts, Inc. (now MHX) |
| MMI | MMI Companies, Inc. |
| MMM | Minnesota Mining and Manufacturing Company |
| MMR | McMoran Exploration Company |
| MMS | Maximus, Inc. |
| MMT | M F S Multimarketing Income Trust |
| MMU | Managed Municipals Portfolio, Inc. |