| MBGL | Mobility Global Inc. Common Stock | | |
| MBI | MBIA Inc. Common Stock | | |
| MC | Moelis & Company Class A Common Stock | | |
| MCB | Metropolitan Bank Holding Corp. Common Stock | | |
| MCD | McDonald's Corporation Common Stock | | SP500 |
| MCI | Barings Corporate Investors Common Stock | | |
| MCK | McKesson Corporation Common Stock | | SP500 |
| MCN | XAI Madison Equity Premium Income Fund Common Shares | | |
| MCO | Moody's Corporation Common Stock | | SP500 |
| MCS | Marcus Corporation (The) Common Stock | | |
| MCY | Mercury General Corporation Common Stock | | |
| MD | Pediatrix Medical Group, Inc. Common Stock | | |
| MDA | MDA Space Ltd. Common Shares | | |
| MDT | Medtronic plc. Ordinary Shares | | SP500 |
| MDU | MDU Resources Group, Inc. Common Stock (Holding Company) | | |
| MEC | Mayville Engineering Company, Inc. Common Stock | | |
| MED | MEDIFAST INC Common Stock | | |
| MEGI | NYLIM CBRE Global Infrastructure Megatrends Term Fund Common Shares | | |
| MEI | Methode Electronics, Inc. Common Stock | | |
| MER-K | Bank of America Corporation Income Capital Obligation Notes initially due December 15, 2066 | | |
| MET | MetLife, Inc. Common Stock | | SP500 |
| MET-A | MetLife, Inc. Preferred Series A Floating Rate | | |
| MET-E | MetLife, Inc. Depositary Shares | | |
| MET-F | MetLife, Inc. Depositary Shares, each representing a 1/1,000th interest in a share of 4.75% Non-Cumulative Preferred Stock, Series F | | |
| MFA | MFA Financial, Inc. | | |
| MFA-B | MFA Financial, Inc. Preferred Series B | | |
| MFA-C | MFA Financial, Inc. 6.50% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock | | |
| MFAN | MFA Financial, Inc. 8.875% Senior Notes due 2029 | | |
| MFAO | MFA Financial, Inc. 9.000% Senior Notes due 2029 | | |
| MFC | Manulife Financial Corporation Common Stock | | |
| MFG | Mizuho Financial Group, Inc. Sponosred ADR (Japan) | | |
| MFM | Aberdeen Municipal Income Fund Common Shares of Beneficial Interest | | |
| MG | Mistras Group Inc Common Stock | | |
| MGA | Magna International, Inc. Common Stock | | |
| MGF | Aberdeen Government Markets Income Fund Common Shares of Beneficial Interest | | |
| MGM | MGM Resorts International Common Stock | | SP500 |
| MGR | Affiliated Managers Group, Inc. 5.875% Junior Subordinated Notes due 2059 | | |
| MGRB | Affiliated Managers Group, Inc. 4.750% Junior Subordinated Notes due 2060 | | |
| MGRD | Affiliated Managers Group, Inc. 4.200% Junior Subordinated Notes due 2061 | | |
| MGRE | Affiliated Managers Group, Inc. 6.750% Junior Subordinated Notes due 2064 | | |
| MGY | Magnolia Oil & Gas Corporation Class A Common Stock | | |
| MH | McGraw Hill, Inc. Common Stock | | |
| MHD | Blackrock MuniHoldings Fund, Inc. Common Stock | | |
| MHF | Western Asset Municipal High Income Fund, Inc. Common Stock | | |
| MHK | Mohawk Industries, Inc. Common Stock | | |
| MHLA | Maiden Holdings, Ltd. 6.625% Notes due 2046 | | |
| MHNC | Maiden Holdings North America, Ltd. 7.75% Notes due 2043 | | |
| MHO | M/I Homes, Inc. Common Stock | | |
| MIAX | Miami International Holdings, Inc. Common Stock | | |
| MICC | The Magnum Ice Cream Company N.V. Ordinary Shares | | |