| Mondo Mini Shows | São Francisco | 1988 |
| Monster | Guaynabo | 1999 |
| Monster Beverage | Minnesota | 1935 |
| Moog Music | Asheville | 1953 |
| Mopar | Chrysler Headquarters and Technology Center | 1933 |
| Morgan Stanley | Nova Iorque | 1931 |
| Mosrite | Arizona | 1956 |
| Motorola Solutions | Chicago | 4 de janeiro de 2011 |
| MSA Safety | Pittsburgh, Cranberry Township | 1914 |
| National Association for Stock Car Auto Racing | Charlotte | 1948 |
| National Association of Underwater Instructors | Flórida | 1959 |
| National Semiconductor | Santa Clara | 1959 |
| National Wrestling Alliance | Houston | 1948 |
| Nautica | Nova Iorque | 1983 |
| Navteq | Chicago | 1985 |
| NCR | Atlanta, Augsburgo | 1884 |
| Neon | Nova Iorque | 2017 |
| Netgear | São José, Dover | 1996 |
| NetJets | Columbus | 1964 |
| Netlify | São Francisco | 27 de janeiro de 2014 |
| NetSuite | Austin | 1998 |
| Neuberger Berman | Nova Iorque | 1939 |
| New York Life Insurance Company | Nova Iorque | 1845 |
| NexGen | Milpitas | 1986 |
| Nexstar Media Group | Irving | 17 de junho de 1996 |
| NeXT | Palo Alto, Redwood City | 20 de junho de 1985 |
| Noble Energy | Houston | 1932 |
| North American Arms | Provo | 1972 |
| Northern Pacific Railway | Saint Paul | 2 de julho de 1864 |
| Northern Trust | Illinois, Chicago | 1889 |
| Northrop Corporation | Hawthorne | 1939 |
| Nuance | Burlington | 1992 |
| NullSoft | Phoenix | 1997 |
| Nvidia | Santa Clara | 5 de abril de 1993 |
| Oakley, Inc. | Foothill Ranch | 1975 |
| Occidental Petroleum | Houston | 1920 |
| Office Depot | Boca Raton | 1986 |
| OfficeMax | — | 1988 |
| Ohio Valley Wrestling | Louisville | 1997 |
| ONErpm | Brooklyn | 2010 |
| Oneworld | Fort Worth | 1999 |
| Onsemi | Scottsdale | 18 de junho de 1992 |
| Open Invention Network | Durham, Nova Iorque | 10 de novembro de 2005 |
| OpenDNS | São Francisco | julho 2006 |
| OQO | São Francisco | 2000 |
| Oracle Corporation | Austin | 16 de junho de 1977 |
| Orbcomm | Fort Lee | 1993 |
| Oshkosh Corporation | Oshkosh | 1917 |