| MS-O | Morgan Stanley Depositary Shares, each representing 1/1,000th of a share of 4.250% Non-Cumulative Preferred Stock, Series O | | |
| MS-P | Morgan Stanley Depositary Shares, each representing 1/1,000th of a share of 6.500% Non-Cumulative Preferred Stock, Series P | | |
| MS-Q | Morgan Stanley Depositary Shares, each representing 1/1,000th of a share of 6.625% Non-Cumulative Preferred Stock, Series Q | | |
| MSA | MSA Safety Incorporated Common Stock | | |
| MSB | Mesabi Trust Common Stock | | |
| MSC | Studio City International Holdings Limited American depositary shares, each representing four Class A ordinary shares | | |
| MSCI | MSCI Inc. Common Stock | | SP500 |
| MSD | Morgan Stanley Emerging Markets Debt Fund, Inc. Common Stock | | |
| MSDL | Morgan Stanley Direct Lending Fund Common Stock | | |
| MSGE | Madison Square Garden Entertainment Corp. Class A Common Stock | | |
| MSGK# | Madison Square Garden Sports Corp. Class A Common Stock When-Issued | | |
| MSGR# | MSG Rangers Corp. Class A Common Stock When-Issued | | |
| MSGS | Madison Square Garden Sports Corp. Class A Common Stock (New) | | |
| MSI | Motorola Solutions, Inc. Common Stock | | SP500 |
| MSIF | MSC Income Fund, Inc. Common Stock | | |
| MSM | MSC Industrial Direct Company, Inc. Common Stock | | |
| MT | Arcelor Mittal NY Registry Shares NEW | | |
| MTAL | Metals Acquisition Corp. II Class A Ordinary Shares | | |
| MTAL+ | Metals Acquisition Corp. II Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share | | |
| MTAL= | Metals Acquisition Corp. II Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant | | |
| MTB | M&T Bank Corporation Common Stock | | SP500 |
| MTB-H | M&T Bank Corporation Perpetual Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series H | | |
| MTB-J | M&T Bank Corporation Depositary Shares each representing a 1/400th ownership interest in a share of Perpetual 7.500% Non-Cumulative Preferred Stock, Series J | | |
| MTB-K | M&T Bank Corporation Depositary Shares each representing a 1/400th interest in a share of Perpetual 6.350% Non-Cumulative Preferred Stock, Series K | | |
| MTB-L | M&T Bank Corporation Depositary Shares each representing a 1/400th ownership interest in a share of Perpetual 6.625% Non-Cumulative Preferred Stock, Series L | | |
| MTD | Mettler-Toledo International, Inc. Common Stock | | SP500 |
| MTDR | Matador Resources Company Common Stock | | |
| MTG | MGIC Investment Corporation Common Stock | | |
| MTH | Meritage Homes Corporation Common Stock | | |
| MTN | Vail Resorts, Inc. Common Stock | | |
| MTNE | CH4 Natural Solutions Corporation Class A Ordinary Shares | | |
| MTNE+ | CH4 Natural Solutions Corporation Warrants, each whole warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50 per share | | |
| MTNE= | CH4 Natural Solutions Corporation Units, each consisting of one Class A ordinary share and one-half of one Warrant | | |
| MTR | Mesa Royalty Trust Common Stock | | |
| MTRN | Materion Corporation | | |
| MTUS | Metallus Inc. Common Shares | | |
| MTW | Manitowoc Company, Inc. (The) Common Stock | | |
| MTX | Minerals Technologies Inc. Common Stock | | |
| MTZ | MasTec, Inc. Common Stock | | |
| MUA | Blackrock MuniAssets Fund, Inc Common Stock | | |
| MUC | Blackrock MuniHoldings California Quality Fund, Inc. Common Stock | | |
| MUFG | Mitsubishi UFJ Financial Group, Inc. Common Stock | | |
| MUJ | Blackrock MuniHoldings New Jersey Quality Fund, Inc. Common Stock | | |
| MUR | Murphy Oil Corporation Common Stock | | |
| MUSA | Murphy USA Inc. Common Stock | | |
| MUX | McEwen Inc. Common Stock | | |
| MWA | MUELLER WATER PRODUCTS Common Stock | | |
| MX | Magnachip Semiconductor Corporation Common Stock | | |
| MXE | Mexico Equity and Income Fund, Inc. (The) Common Stock | | |
| MXF | Mexico Fund, Inc. (The) Common Stock | | |