| 23andMe | South San Francisco | abril 2006 |
| 2540p | Lake Forest | 2005 |
| 7-Eleven | Dallas, Irving | 1927 |
| A. O. Smith | Milwaukee | 1889 |
| A.T. Kearney | Chicago | 1926 |
| ABC Family Worldwide | Burbank | 1990 |
| AbioMed | Danvers | 1981 |
| Adafruit Industries | Nova Iorque | 2005 |
| Adient | Dublin | 31 de outubro de 2016 |
| Advent International | Boston | 1984 |
| Aeria Games | Berlim | 2006 |
| Aerojet Rocketdyne | Palm Bay | junho 2013 |
| AeroVironment | Simi Valley | 1971 |
| Aetna | Hartford | 1853 |
| Affirm Films | Culver City | 2008 |
| Aflac | Columbus | 1955 |
| Ageia | Santa Clara | 2002 |
| Agilent Technologies | Santa Clara | 1999 |
| Agência Nacional de Detetives Pinkerton | Ann Arbor | fevereiro 1855 |
| Air Products & Chemicals | Detroit | 1940 |
| Air Tractor | Olney | 1973 |
| Airbnb | São Francisco | 2008 |
| Airstream | Jackson Center | 1931 |
| Airtable | São Francisco | 2012 |
| Aksys Games | Torrance | 14 de julho de 2006 |
| Albemarle Corporation | Baton Rouge | 1994 |
| Albertsons | Boise | 1939 |
| Alcon Entertainment | Los Angeles | 1997 |
| Aldus | Seattle | 1 de fevereiro de 1984 |
| Alexa Internet | São Francisco, Califórnia | abril 1996 |
| Aliança das Indústrias Eletrônicas | condado de Arlington | 1924 |
| Allen-Bradley | Milwaukee | 1903 |
| Allison Engine Company | Indianápolis | 1915 |
| Allison Transmission | Indianápolis | 1916 |
| Allstate | Northbrook | 17 de abril de 1931 |
| Alltel | Little Rock | 1943 |
| Altair Engineering | Troy | 1985 |
| AMC Theatres | Kansas City | 1920 |
| AMD | Santa Clara | 1 de maio de 1969 |
| Amdahl Corporation | Sunnyvale | 19 de outubro de 1970 |
| American Axle | Detroit | 1994 |
| American Bantam | Butler | 1935 |
| American Eagle Outfitters | Pittsburgh | 1977 |
| American Express | Nova Iorque | 1850 |
| American Tourister | Rhode Island | 1933 |
| American Type Founders | Elizabeth | 1892 |
| American Wrestling Association | Minneapolis | 1960 |
| Ameriprise Financial | Minneapolis | 1894 |