| Abbreviation | Definition |
|---|---|
| MTOR | Meritor Savings Bank of Pennsylvania |
| MTPPQ | Montana Power Capital I (in default) |
| MTPWN | Montana Power Company |
| MTPWP | Montana Power Company Preferred |
| MTRNE | MetroTrans Corporation |
| MTRX | Matrix Service Company |
| MTSC | M T S Systems Corporation |
| MTSI | Micro Touch Systems, Inc. |
| MTSL | M E R Telemanagement Solutions, LTD. |
| MTSN | Mattson Technology, Inc. |
| MTST | Microtest, Inc. |
| MTTL | Monroe Title Insurance Corporation |
| MTUC | Mutual Community Savings Bank, Inc. |
| MTXC | Matrix Bancorp, Inc. |
| MTXCP | Matrix Bancorp, Inc. |
| MUCP | M S U Corporation |
| MUEI | Micron Electronics, Inc. |
| MUEL | Paul Mueller Company |
| MULT | Multi Solutions, Inc. |
| MURC | Murdock Communications Corporation |