| MRK | Merck & Co. Inc. | 45.47 | Stock | Drug Manufacturers - Major | NYQ |
| MELI | Mercadolibre, Inc. | 125.37 | Stock | Internet Software & Services | NMS |
| MDP | Meredith Corporation | 42.78 | Stock | Publishing - Periodicals | NYQ |
| MTH | Meritage Homes Corporation | 51.16 | Stock | Residential Construction | NYQ |
| MERU | Meru Networks, Inc. | 3.64 | Stock | Wireless Communications | NGM |
| MCY | Mercury General Corporation | 45.56 | Stock | Property & Casualty Insurance | NYQ |
| MTOR | Meritor, Inc. | 6.98 | Stock | Auto Parts | NYQ |
| MRGE | Merge Healthcare Incorporated | 3.30 | Stock | Healthcare Information Services | NMS |
| ^MERV | MERVAL BUENOS AIRES | 3,694.74 | Index | | BUE |
| MRCY | Mercury Systems, Inc. | 9.20 | Stock | Computer Peripherals | NMS |
| MACK | Merrimack Pharmaceuticals, Inc. | 5.66 | Stock | Biotechnology | NGM |
| VIVO | Meridian Bioscience, Inc. | 21.76 | Stock | Diagnostic Substances | NMS |
| MERC | Mercer International Inc. | 6.53 | Stock | Paper & Paper Products | NMS |
| MBWM | Mercantile Bank Corp. | 16.97 | Stock | Regional - Midwest Banks | NMS |
| FRME | First Merchants Corporation | 16.52 | Stock | Regional - Midwest Banks | NMS |
| MMSI | Merit Medical Systems, Inc. | 10.13 | Stock | Medical Instruments & Supplies | NMS |
| MBVT | Merchants Bancshares Inc. | 29.00 | Stock | Regional - Northeast Banks | NMS |
| MRK.DE | Merck KGaA | 119.40 | Stock | Drugs - Generic | GER |
| MERFX | Merger | 15.97 | Mutual Fund | | NAS |
| TUNG | Tungsten Corp., Prior to Reverse merger with Nevada Tungsten Holdings Ltd. | 0.90 | Stock | | PNK |