| Panoz | Hoschton | 1989 |
| Parallels | Renton | 1999 |
| Parametric Technology Corporation | Boston | maio 1985 |
| Paramount Global | Nova Iorque, One Astor Plaza | 4 de dezembro de 2019 |
| Parker Brothers | Beverly, Salém | 1883 |
| Patagonia (marca de roupa) | Ventura | 1973 |
| Peavey | Meridian | 1965 |
| Peerless | Cleveland | 1900 |
| Peet's Coffee | Emeryville | 1966 |
| Penguin Random House | Nova Iorque | 1 de julho de 2013 |
| Pennsylvania Railroad | Filadélfia | 13 de abril de 1846 |
| Pentaho | Orlando | 2004 |
| Phillips 66 | Westchase | 1 de maio de 2012 |
| PhoenixEV | Ontario | 2002 |
| Pierce-Arrow | Buffalo | 1870 |
| PIMCO | Newport Beach | 1971 |
| Pinkberry | Los Angeles | 2005 |
| Pinnacle Systems | Mountain View | 1986 |
| Plaxo | Sunnyvale | julho 2001 |
| Plug Power | Latham, Slingerlands | 1997 |
| PNC Financial Services | One PNC Plaza | 1982 |
| Precision Manuals Development Group | Alexandria | 1997 |
| Pro Wrestling Guerrilla | Sul da Califórnia | 2003 |
| Procter & Gamble | Ohio, Cincinnati | 31 de outubro de 1837 |
| Progressive Corporation | Mayfield | 10 de março de 1937 |
| Prometheus Global Media | Nova Iorque | 2009 |
| Providence Equity Partners | 50 Kennedy Plaza | 1989 |
| PRS Guitars | Stevensville | 1985 |
| Prudential Financial | Prudential Headquarters | 1875 |
| Pyra Labs | São Francisco | 1999 |
| Qlik | King of Prussia | 1993 |
| Qorvo | Greensboro | 2015 |
| Quaker Oats | Chicago | 1877 |
| Qualcomm | San Diego | julho 1985 |
| Quiksilver | Huntington Beach | 1969 |
| R. J. Reynolds Tobacco Company | Winston-Salem | 1874 |
| Raising Cane's Chicken Fingers | Baton Rouge | 1996 |
| Ralph Lauren (marca) | Nova Iorque | 1967 |
| Ralston Purina | St. Louis | 1894 |
| Rambus | Sunnyvale | 1990 |
| Rasmussen Reports | Asbury Park | 2003 |
| Rayovac | Middleton | 1906 |
| RCA Corporation | Rockefeller Center, Nova Iorque | 1919 |
| Red Orb Entertainment | Novato | 1997 |
| Red Ventures | Charlotte, Fort Mill, Indian Land | 2000 |
| Red Wing Shoes | Red Wing | 1905 |
| Redback Networks | São José | 1996 |
| Redfin | Seattle | 2004 |