| Lonely Planet | Melbourne | 1972 |
| LSI Logic | Milpitas | 1981 |
| Lycoming | Williamsport | 1845 |
| Lytro | Mountain View | 2006 |
| M-Audio | Cumberland | 1998 |
| Macy's, Inc. | Cincinnati, Macy's Herald Square | 1929 |
| Mad Catz | San Diego | 1989 |
| Mailchimp | Ponce City Market | 2001 |
| Major League Soccer | Pennsylvania Plaza | 17 de dezembro de 1993 |
| Malwarebytes | Santa Clara | 21 de janeiro de 2008 |
| Marathon Petroleum | Findlay | 2009 |
| Mark Levinson | Estados Unidos | 1972 |
| Marmot | Santa Rosa | 1974 |
| Marvell Technology | Santa Clara | 1995 |
| Masdar | Abu Dhabi | abril 2006 |
| Masten Space Systems | Mojave | 2004 |
| Mastercard | Purchase | 1966 |
| Match Group | Kerrville | 2009 |
| Maxwell Technologies | San Diego | 1965 |
| McIntosh Laboratory | Binghamton, Nova Iorque | 1949 |
| McKesson Corporation | Irving | 1994 |
| Meraki | São Francisco | 2006 |
| Mercury Marine | Fond du Lac | 1939 |
| Meredith Corporation | Des Moines | 1902 |
| Merrell | Rockford | 1981 |
| MetLife | Nova Iorque | 24 de março de 1868 |
| Metro Pictures Corporation | Los Angeles | 1915 |
| MGA Entertainment | Los Angeles | 1979 |
| MGM Television | Beverly Hills | 1956 |
| Micro Instrumentation and Telemetry Systems | Albuquerque | 1970 |
| Microchip Technology | Chandler | 1989 |
| Milwaukee Electric Tool Corporation | Brookfield | 1924 |
| MIPS Technologies | Sunnyvale | 1984 |
| Missouri Pacific Railroad | St. Louis | 1917 |
| Mistwalker | Tóquio, Japão, Honolulu | 2004 |
| Mondelēz International | Chicago | 2012 |
| Monster | Guaynabo | 1999 |
| Morgan Stanley | Nova Iorque | 1931 |
| Morningstar, Inc. | Chicago | 1984 |
| MOS Technology | Norristown | 1969 |
| Mosrite | Arizona | 1956 |
| Motorola | Schaumburg | 25 de setembro de 1928 |
| MSA Safety | Pittsburgh, Cranberry Township | 1914 |
| MUFG Union Bank | São Francisco | 1864 |
| Mutual Film Corporation | Edendale | julho 1906 |
| Namesys | Oakland | 2004 |
| Narus | Sunnyvale | 1997 |
| Nash Motors | Kenosha | 1914 |