| Abbreviation | Definition |
|---|---|
| MCSI | MCSi, Inc. (formerly Miami Computing Supply Corporation) |
| MCSW | Mission Critical Software |
| MCTI | Micro Component Technologies, Inc. |
| MCTL | Microtel International |
| MCTR | T S I International Software |
| MCYC | MCY.Com, Inc. |
| MDBK | Medford Bancorp, Inc. |
| MDBRF | edbroadcast Corporation |
| MDBRF | Medbroadcast Corporation |
| MDCA | M D C Corporation, Inc. |
| MDCC | Molecular Devices Corporation |
| MDCH | Meditech Pharmaceuticals |
| MDCI | Medical Action Industries, Inc. |
| MDCL | Medical Control, Inc. |
| MDCLW | Medical Control, Inc. Warrants |
| MDCM | Mortgage.Com, Inc. |
| MDDCE | MonsterData.Com, Inc. |
| MDDS | Monarch Dental Corporation |
| MDEA | Media 100, Inc. |
| MDER | Med- Emerg International, Inc. |