| Mosrite | Arizona | 1956 |
| MSA Safety | Pittsburgh, Cranberry Township | 1914 |
| Namesys | Oakland | 2004 |
| Nash Motors | Kenosha | 1914 |
| National Association for Stock Car Auto Racing | Charlotte | 1948 |
| National Geographic Partners | Nova Iorque | 9 de setembro de 2015 |
| National Instruments | Austin | 1976 |
| National Semiconductor | Santa Clara | 1959 |
| Nautica | Nova Iorque | 1983 |
| Navteq | Chicago | 1985 |
| NCR | Atlanta, Augsburgo | 1884 |
| NetApp | Sunnyvale | 1992 |
| Netlify | São Francisco | 27 de janeiro de 2014 |
| New Holland | Itália | 1891 |
| New York Life Insurance Company | Nova Iorque | 1845 |
| New York Mercantile Exchange | Nova Iorque | 1872 |
| Newegg | Industry | 2001 |
| News Corp | Nova Iorque | 28 de junho de 2013 |
| NexGen | Milpitas | 1986 |
| NeXT | Palo Alto, Redwood City | 20 de junho de 1985 |
| Nik Software | San Diego | 1995 |
| Nike | Beaverton | 25 de janeiro de 1964 |
| Noble Energy | Houston | 1932 |
| North American Arms | Provo | 1972 |
| Norwegian Cruise Line | Condado de Miami-Dade | 1966 |
| Nucor | Charlotte | setembro 1955 |
| NullSoft | Phoenix | 1997 |
| Obsidian Entertainment | Irvine | 12 de junho de 2003 |
| Occidental Petroleum | Houston | 1920 |
| Ocean Spray | Lakeville | 1930 |
| OceanGate | Everett | 2009 |
| Odyssey Marine Exploration | Tampa | 1994 |
| Office Depot | Boca Raton | 1986 |
| OfficeMax | — | 1988 |
| ONErpm | Brooklyn | 2010 |
| OpenDNS | São Francisco | julho 2006 |
| Osborne Computer Corporation | Hayward | 27 de setembro de 1979 |
| Oscar Mayer | Chicago | 1883 |
| OTCBB | Washington, D.C. | — |
| Overbrook Entertainment | Beverly Hills, Los Angeles | 1998 |
| Overland Automobile | Indianápolis | 1903 |
| Owens-Illinois | Toledo, Perrysburg | 1903 |
| Pacific Data Images | Redwood City | 1980 |
| Palm | Sunnyvale | 1992 |
| PalmSource | Reston | — |
| Panavision | Woodland Hills | 1953 |
| Panoz | Hoschton | 1989 |
| Pantone | Carlstadt | 1962 |