| Abbreviation | Definition |
|---|---|
| MRO | Melrose |
| MRS | Melrose Resources, PLC. |
| MRW | Morrison (Wm) |
| MRX | Metalrax Group |
| MSD | Musedia Corp |
| MSD | Musedia Corporation |
| MSG | Milestone Group |
| MSG | Milestone Grp |
| MSI | Ms Intl. |
| MSLH | Marshalls |
| MSQ | Media Square |
| MSS | Managed Support |
| MST | Mid-States (de-listed) |
| MSY | Misys |
| MSYS | Microsaic |
| MTA | Matra Petroleum, P.L.C. |
| MTC | Mothercare |
| MTCA | Motech 144A |
| MTCH | Motech |
| MTE | Montanaro |