| NetSuite | Austin | 1998 |
| New Holland | Itália | 1891 |
| Newmont Mining Corporation | Denver | 1916 |
| News Corp | Nova Iorque | 28 de junho de 2013 |
| NeXT | Palo Alto, Redwood City | 20 de junho de 1985 |
| Nomura Securities Co Ltd | Nihonbashi, Tóquio | 7 de maio de 2001 |
| Norfolk Southern | Norfolk | 1894 |
| Northrop Corporation | Hawthorne | 1939 |
| Nucor | Charlotte | setembro 1955 |
| Nvidia | Santa Clara | 5 de abril de 1993 |
| NYSE Euronext | New York Stock Exchange Building, Londres | 4 de abril de 2007 |
| O.F. Mossberg & Sons | North Haven | 1919 |
| Ohio Valley Wrestling | Louisville | 1997 |
| Old Navy | São Francisco | 1994 |
| On2 Technologies | Nova Iorque | 1999 |
| Onsemi | Scottsdale | 18 de junho de 1992 |
| OpenDNS | São Francisco | julho 2006 |
| Oracle Corporation | Austin | 16 de junho de 1977 |
| Orbcomm | Fort Lee | 1993 |
| Organon & Co. | Oss | 1923 |
| Orion Pictures | Los Angeles | janeiro 1978 |
| Osborne Computer Corporation | Hayward | 27 de setembro de 1979 |
| Oscar Mayer | Chicago | 1883 |
| Oshkosh Corporation | Oshkosh | 1917 |
| OTCBB | Washington, D.C. | — |
| Otis Elevator Company | Farmington | 1853 |
| Overbrook Entertainment | Beverly Hills, Los Angeles | 1998 |
| Owens-Illinois | Toledo, Perrysburg | 1903 |
| Pacific Data Images | Redwood City | 1980 |
| Palantir Technologies | Miami | 2003 |
| Pan American World Airways | Nova Iorque | 14 de março de 1927 |
| Panavision | Woodland Hills | 1953 |
| Panoz | Hoschton | 1989 |
| Paramount Global Content Distribution | Santa Mônica, Nova Iorque | 1962 |
| Parker Brothers | Beverly, Salém | 1883 |
| Parker Guitars | Buffalo Grove | 1993 |
| Parkwood Entertainment | Los Angeles | 2008 |
| Patagonia (marca de roupa) | Ventura | 1973 |
| Payoneer | Nova Iorque | 2005 |
| Peabody Energy | St. Louis | 1883 |
| Peavey | Meridian | 1965 |
| Peerless | Cleveland | 1900 |
| Pennsylvania Railroad | Filadélfia | 13 de abril de 1846 |
| PeopleSoft | Pleasanton, Califórnia | 1987 |
| Philip Morris International | Stamford, Lausana | 1987 |
| Pierce-Arrow | Buffalo | 1870 |
| Pillsbury Company | Minneapolis | 1872 |
| Pitney Bowes | Stamford | 1920 |