| Lucasfilm Animation | São Francisco | 12 de maio de 2003 |
| M&T Bank | Buffalo | 1856 |
| Mad Catz | San Diego | 1989 |
| Mailchimp | Ponce City Market | 2001 |
| Major League Soccer | Pennsylvania Plaza | 17 de dezembro de 1993 |
| Malpaso Productions | Burbank | 1967 |
| Mark Levinson | Estados Unidos | 1972 |
| Marmot | Santa Rosa | 1974 |
| Marriott Internacional | Bethesda | 8 de outubro de 1993 |
| Martin Marietta | Bethesda | 1961 |
| Marvell Technology | Santa Clara | 1995 |
| Massey Ferguson | Duluth | 1953 |
| MasterClass | São Francisco | 2015 |
| Maybelline | Nova Iorque | 1915 |
| McAfee | Santa Clara, São José | 1987 |
| McGraw-Hill Education | Nova Iorque | 1888 |
| McIntosh Laboratory | Binghamton, Nova Iorque | 1949 |
| McKesson Corporation | Irving | 1994 |
| Meade Instruments | Irvine | 1972 |
| Memorex | Cerritos | 1961 |
| Mentholatum | Orchard Park | 1889 |
| Mentor Graphics | Wilsonville | 1981 |
| Merrill Lynch | Nova Iorque | 6 de janeiro de 1914 |
| Metro Pictures Corporation | Los Angeles | 1915 |
| Metro-Goldwyn-Mayer | Los Angeles | 17 de abril de 1924 |
| MGM Holdings | Beverly Hills | 11 de fevereiro de 2005 |
| MGM Television | Beverly Hills | 1956 |
| Middle-earth Enterprises | Berkeley | 2022 |
| Midway Games | Chicago | 1988 |
| Milton Bradley Company | East Longmeadow | 1860 |
| Milwaukee Electric Tool Corporation | Brookfield | 1924 |
| Modulus Graphite | Richmond | 1978 |
| Molex | Lisle | 1938 |
| Mondo Mini Shows | São Francisco | 1988 |
| Monster Beverage | Minnesota | 1935 |
| Morgan Stanley | Nova Iorque | 1931 |
| Morningstar, Inc. | Chicago | 1984 |
| Mosrite | Arizona | 1956 |
| MSA Safety | Pittsburgh, Cranberry Township | 1914 |
| MSCI | Nova Iorque | 1969 |
| MUFG Union Bank | São Francisco | 1864 |
| Narus | Sunnyvale | 1997 |
| National Geographic Partners | Nova Iorque | 9 de setembro de 2015 |
| National Wrestling Alliance | Houston | 1948 |
| Navteq | Chicago | 1985 |
| Neon | Nova Iorque | 2017 |
| Netgear | São José, Dover | 1996 |
| Netlify | São Francisco | 27 de janeiro de 2014 |