| Macquarie Bank Ltd. | Australien | | 7 |
| Macquarie Group Ltd. | Australien | | 2 |
| Macy's Retail Holdings Inc. | USA | | 2 |
| Madrileña Red de Gas Finance B.V. | Niederlande | | 2 |
| Magna International Inc. | Kanada | | 2 |
| MAHLE GmbH | Deutschland | | 2 |
| Main Capital Funding II L.P. | | | 1 |
| Main Capital Funding L.P. | | | 1 |
| Manitoba, Provinz | Kanada | | 1 |
| ManpowerGroup Inc. | USA | | 1 |
| Mapfre S.A. | Spanien | | 1 |
| Marathon Oil Corp. | USA | | 4 |
| Marathon Petroleum Corp. | USA | | 1 |
| Marfrig Holding Europe B.V. | Niederlande | | 1 |
| Marinomed Biotech AG | Österreich | | 1 |
| Marokko, Königreich | Marokko | | 2 |
| Marriott International Inc. | USA | | 1 |
| Marsh & McLennan Cos. Inc. | USA | | 1 |
| Masco Corp. | USA | | 1 |
| Mastercard Inc. | USA | | 5 |
| Mattel Inc. | USA | | 1 |
| Matterhorn Telecom S.A. | Luxemburg | | 1 |
| Mazedonien, Republik | Nordmazedonien | | 1 |
| McDonald's Corp. | USA | | 25 |
| McKesson Corp. | USA | | 1 |
| MDC - GMTN B.V. | Niederlande | | 4 |
| Mecklenburg-Vorpommern, Land | Deutschland | | 3 |
| Mercedes-Benz Australia/Pacific Pty. Ltd. | Australien | | 7 |
| Mercialys | Frankreich | | 1 |
| Merck & Co. Inc. | USA | | 13 |
| Merck Financial Services GmbH | Deutschland | | 3 |
| Merck KGaA | Deutschland | | 2 |
| Merlin Properties SOCIMI S.A. | Spanien | | 5 |
| Metalcorp Group B.V. | Niederlande | | 1 |
| Metinvest B.V. | Niederlande | | 1 |
| MetLife Inc. | USA | | 1 |
| METRO AG | Deutschland | | 4 |
| Metropolitan Life Global Funding I | USA | | 9 |
| Metsä Board Oyj | Finnland | | 1 |
| MFB Magyar Fejlesztesi Bank Zrt. | Ungarn | | 1 |
| mFinance France S.A. | Frankreich | | 3 |
| Michael Kors [USA] Inc. | USA | | 1 |
| Michelin Luxembourg SCS | Luxemburg | | 3 |
| Microchip Technology Inc. | USA | | 1 |
| Micron Technology Inc. | USA | | 3 |
| Microsoft Corp. | USA | | 31 |
| Millicom International Cellular S.A. | Luxemburg | | 1 |
| Mitsubishi UFJ Investor Services & Banking [Luxembourg] S.A. | Luxemburg | | 1 |
| Mitsubishi UFJ Financial Group Inc. | Japan | | 5 |
| Mizuho Bank Ltd. | Japan | | 2 |
| Mizuho Financial Group Inc. | Japan | | 5 |
| Mobilux Finance S.A.S. | Frankreich | | 1 |
| Mogo A.S. | Lettland | | 1 |
| Mogo Finance S.A. | Luxemburg | | 1 |
| Mohawk Industries Inc. | USA | | 1 |
| MOL Group Finance S.A. | Luxemburg | | 1 |
| MOL Magyar Olaj- és Gázipari Nyilvánosan muködo Részvénytársaság[Nyrt.] | Ungarn | | 1 |
| Mölnlycke Holding AB | Schweden | | 1 |
| Molson Coors Brewing Co. | USA | | 1 |
| Mondelez International Inc. | USA | | 9 |
| Mondi Finance PLC | | | 2 |
| Monitchem Holdco 2 S.A. | Luxemburg | | 1 |
| Monsanto Co. | USA | | 7 |
| Montenegro, Republik | | | 2 |
| Morgan Stanley | USA | | 42 |
| Motability Operations Group PLC | | | 3 |
| Motor Oil Finance PLC | | | 1 |
| Motorola Solutions Inc. | USA | | 1 |
| MPLX L.P. | USA | | 5 |
| MPT Operating Partnership L.P./MPT Finance Corp. | USA | | 1 |
| MSC Cruises S.A. | Schweiz | | 1 |
| MTU Aero Engines AG | Deutschland | | 1 |
| Mueller Water Products Inc. | USA | | 1 |
| Mumtalakat Sukuk Holding Co. | Kaimaninseln | | 1 |
| Münchener Hypothekenbank eG | Deutschland | | 9 |
| Münchener Rückversicherungs-Gesellschaft AG in München | Deutschland | | 4 |
| Municipality Finance PLC | Finnland | | 3 |
| Murphy & Spitz Green Energy AG | Deutschland | | 1 |
| Mylan N.V. | Niederlande | | 3 |
