| 23andMe | South San Francisco | abril 2006 |
| 3dfx | San José | 1994 |
| 7-Eleven | Dallas, Irving | 1927 |
| A. O. Smith | Milwaukee | 1889 |
| Abercrombie & Fitch | New Albany | 1892 |
| Abiomed | Danvers | 1981 |
| Ace Hardware | Oak Brook | 1924 |
| ACNielsen | Chicago | 1923 |
| Activision Blizzard | Santa Mónica | 10 de julio de 2008 |
| Adafruit Industries | Nueva York | 2005 |
| Adient | Dublín | 31 de octubre de 2016 |
| AdMob | Mountain View | 2006 |
| Adobe Inc. | San José | 28 de febrero de 1982 |
| Adscape | San Francisco | 2006 |
| Advance Auto Parts | Roanoke | 1932 |
| Aeria Games | Berlín | 2006 |
| Aero Commander | Culver City | 1944 |
| Aetna | Hartford | 1853 |
| Affirm Films | Culver City | 2008 |
| Aflac | Columbus | 1955 |
| Agencia Nacional de Detectives Pinkerton | Ann Arbor | febrero 1855 |
| Airtable | San Francisco | 2012 |
| Alexa Internet | San Francisco, California | abril 1996 |
| Alfred Music Publishing | Los Ángeles | 1922 |
| Alienware | Miami | 1996 |
| Allen-Bradley | Milwaukee | 1903 |
| AllianceBernstein | Nashville | 1967 |
| Allstate | Northbrook | 17 de abril de 1931 |
| Ally Financial | Detroit, Nueva York | 1919 |
| Altair Engineering | Troy | 1985 |
| Amaze Entertainment | Kirkland | 1997 |
| Amazon Lab126 | Cupertino | 2004 |
| American Axle | Detroit | 1994 |
| American Bantam Company | Butler | 1935 |
| American Cyanamid | Wayne | 1907 |
| American Eagle Outfitters | Pittsburgh | 1977 |
| American Girl | — | 1986 |
| American International Group | Nueva York | 1919 |
| American LaFrance | Summerville | 1873 |
| American Megatrends | Norcross | 1985 |
| American Power Conversion | West Kingston | 1981 |
| American Society of Composers, Authors and Publishers | Estados Unidos, Nueva York | 1914 |
| American Tourister | Rhode Island | 1933 |
| American Wrestling Association | Minneapolis | 1960 |
| Amgen | Thousand Oaks | 1980 |
| Amlogic | Santa Clara | 1995 |
| Ampex | Redwood City | 1944 |
| Amphenol | Wallingford | 1932 |