| MRK | Merck & Co. Inc. | 37.55 | Stock | Drug Manufacturers - Major | NYQ |
| MRGE | Merge Healthcare Incorporated | 2.63 | Stock | Healthcare Information Services | NMS |
| MELI | Mercadolibre, Inc. | 74.73 | Stock | Business Services | NMS |
| MTH | Meritage Homes Corporation | 29.97 | Stock | Residential Construction | NYQ |
| MDP | Meredith Corp. | 30.38 | Stock | Publishing - Periodicals | NYQ |
| MTOR | Meritor, Inc. | 5.43 | Stock | Auto Parts | NYQ |
| ^MERV | MERVAL BUENOS AIRES | 2,340.26 | Index | | BUE |
| VIVO | Meridian Bioscience Inc. | 19.18 | Stock | Diagnostic Substances | NMS |
| MERU | Meru Networks, Inc. | 1.68 | Stock | Wireless Communications | NGM |
| MERC | Mercer International Inc. | 6.35 | Stock | Paper & Paper Products | NMS |
| MCY | Mercury General Corporation | 43.67 | Stock | Property & Casualty Insurance | NYQ |
| MRCY | Mercury Computer Systems, Inc. | 11.76 | Stock | Computer Peripherals | NMS |
| FRME | First Merchants Corp. | 11.79 | Stock | Regional - Midwest Banks | NMS |
| ML.TO | Mercator Minerals Limited | 0.65 | Stock | Industrial Metals & Minerals | TOR |
| MMSI | Merit Medical Systems, Inc. | 13.25 | Stock | Medical Instruments & Supplies | NMS |
| EBSB | Meridian Interstate Bancorp, Inc. | 13.13 | Stock | Savings & Loans | NMS |
| PMBC | Pacific Mercantile Bancorp | 6.15 | Stock | Regional - Pacific Banks | NMS |
| MERDX | Meridian Growth | 44.61 | Mutual Fund | | NAS |
| MBWM | Mercantile Bank Corp. | 14.82 | Stock | Regional - Midwest Banks | NMS |
| MBVT | Merchants Bancshares Inc. | 26.24 | Stock | Regional - Northeast Banks | NMS |