| MRCOW | Mercator Acquisition Corp. - Warrant | | |
| MRCY | Mercury Systems Inc - Common Stock | | |
| MRDN | Meridian Holdings Inc. - Common Stock | | |
| MREO | Mereo BioPharma Group plc - American Depositary Shares | D | |
| MRKR | Marker Therapeutics, Inc. - Common Stock | | |
| MRLN | Merlin, Inc. - Common Stock | | |
| MRM | MEDIROM Healthcare Technologies Inc. - American Depositary Share | H | |
| MRNA | Moderna, Inc. - Common Stock | | SP500 |
| MRNO | Murano Global Investments PLC - Ordinary Shares | D | |
| MRNOW | Murano Global Investments PLC - Warrants | | |
| MRTN | Marten Transport, Ltd. - Common Stock | | |
| MRVI | Maravai LifeSciences Holdings, Inc. - Class A common stock | | |
| MRVL | Marvell Technology, Inc. - Common Stock | | SP500 |
| MRX | Marex Group Limited - Ordinary Shares | | |
| MSAI | MultiSensor AI Holdings, Inc. - Common Stock | | |
| MSAIW | MultiSensor AI Holdings, Inc. - Warrants | | |
| MSBI | Midland States Bancorp, Inc. - Common Stock | | |
| MSBIP | Midland States Bancorp, Inc. - Depositary Shares Each Representing a 1/40th Interest in a Share of 7.750% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series A | | |
| MSEX | Middlesex Water Company - Common Stock | | |
| MSFT | Microsoft Corporation - Common Stock | | SP500 |
| MSGM | Motorsport Games Inc. - Class A Common Stock | | |
| MSGY | Masonglory Limited - Class A Ordinary Shares | | |
| MSLE | Satellos Bioscience Inc. - Common Stock | | |
| MSS | Maison Solutions Inc. - Class A Common Stock | E | |
| MSTR | Strategy Inc - Class A Common Stock | | |
| MTAK | Market Technology Acquisition Corp - Class A Ordinary Shares | | |
| MTAKU | Market Technology Acquisition Corp - Unit | | |
| MTAKW | Market Technology Acquisition Corp - Warrants | | |
| MTC | MMTec, Inc. - Common Shares | | |
| MTCH | Match Group, Inc. - Common Stock | | |
| MTEK | Maris-Tech Ltd. - ordinary shares | | |
| MTEKW | Maris-Tech Ltd. - Warrants | | |
| MTEN | Mingteng International Corporation Inc. - Class A Ordinary Shares | | |
| MTEX | Mannatech, Incorporated - Common Stock | | |
| MTLS | Materialise NV - American Depositary Shares | | |
| MTRX | Matrix Service Company - Common Stock | | |
| MTSI | MACOM Technology Solutions Holdings, Inc. - Common Stock | | |
| MTVA | MetaVia Inc. - Common Stock | | |
| MU | Micron Technology, Inc. - Common Stock | | SP500 |
| MUZE | Muzero Acquisition Corp - Class A Ordinary Shares | | |
| MUZEU | Muzero Acquisition Corp - Unit | | |
| MUZEW | Muzero Acquisition Corp - Warrant | | |
| MVBF | MVB Financial Corp. - Common Stock | | |
| MVIS | MicroVision, Inc. - Common Stock | | |
| MVST | Microvast Holdings, Inc. - Common Stock | D | |
| MWC | Micware Co., Ltd. - American Depositary Shares | | |
| MWH | SOLV Energy, Inc. - Class A common stock | | |
| MWYN | Marwynn Holdings, Inc. - Common stock | | |
| MXCT | MaxCyte, Inc. - Common Stock | | |
| MXL | MaxLinear, Inc - Common Stock | | |