| Abbreviation | Definition |
|---|---|
| MKAU | MK Automotive, Inc. |
| MKFCF | Mackenzie Financial Corporation |
| MKIE | Mackie Designs, Inc. |
| MKRS | Mikros Systems Corporation |
| MKSI | M K S Instruments, Inc. |
| MKSP | Marketing Specialists Corporation |
| MKTAY | Makita Corporation |
| MKTS | MarketCentral.Net Corporation |
| MKTW | Marketwatch.Com, Inc. |
| MKTY | Mechanical Technology, Inc. |
| MKYMF | Mount Kersey Mining, N. L. |
| MLAB | Mesa Laboratories, Inc. |
| MLAN | Midland Company |
| MLAR | Micro Laboratories, Inc. |
| MLBAY | Malbak, LTD. |
| MLCC | M L C Corporation (de-listed) |
| MLCC | MLC Corporation |
| MLDS | Million Dollar Saloon, Inc. |
| MLHR | Herman Miller Furniture, Inc. |
| MLIN | Micro Linear Corporation |