| Anadarko Petroleum | The Woodlands | 1959 |
| Anchor Brewing Company | São Francisco | 1896 |
| Anduril Industries | Califórnia | 2017 |
| Anschutz Entertainment Group | Los Angeles | — |
| Apollo Computer | Chelmsford | 1980 |
| Apollo Global Management | Solow Building | 1990 |
| Apollo Group | Phoenix | 1973 |
| Apple Inc. | Cupertino | 1 de abril de 1976 |
| Aramark | Filadélfia | 1959 |
| Arby's | Sandy Springs | 1964 |
| Archegos Capital Management | Manhattan | 9 de outubro de 2001 |
| Archie Comics | Nova Iorque, Pelham | 1939 |
| ARCO | Los Angeles | 1966 |
| ARP Instruments, Inc. | Estados Unidos | 1969 |
| Arris Group | Suwanee | 1995 |
| Arthur Andersen | Chicago | 1913 |
| Arthur J. Gallagher & Co. | Itasca | 1927 |
| Ashland Inc. | Covington | 1924 |
| Ashton-Tate | Torrance | agosto 1980 |
| ASTM | West Conshohocken | 1961 |
| AstraZeneca (United States) | Gaithersburg | 1988 |
| Astrobotic Technology | Pittsburgh | novembro 2007 |
| Atari Corporation | Sunnyvale | 2 de julho de 1984 |
| Au Bon Pain | Boston | 1978 |
| Auburn Automobile | Auburn | 1900 |
| Augusta National Golf Club | — | 1930 |
| Autocar Company | Hagerstown | 1897 |
| AutoNation | Fort Lauderdale | 1996 |
| Avatar Press | Rantoul | 1996 |
| Avnet | Phoenix | 1921 |
| Axios | condado de Arlington | 2017 |
| Bad Dragon | Phoenix | junho 2008 |
| Baker Hughes | Houston | 1987 |
| Baker Motor Vehicle | Cleveland | 1899 |
| Baldwin Piano Company | Trumann | 1862 |
| Baltimore and Ohio Railroad | Baltimore | 1827 |
| Bank of America | Charlotte | 1784 |
| Bank of America Merrill Lynch | Bank of America Tower | 2009 |
| Bank of North Dakota | Bismarck | 1919 |
| Bankers Trust | Nova Iorque | 1903 |
| Bare Knuckle Fighting Championship | Filadélfia | 2018 |
| Barnes & Noble | Nova Iorque | 1873 |
| Barrett Firearms Manufacturing | Christiana | 1982 |
| Basecamp | Chicago | 2004 |
| Baskin-Robbins | Canton | 1945 |
| Bath & Body Works, Inc. | Columbus | 1963 |
| Bauer Hockey | Exeter | 1927 |
| Bausch Health | Laval, Wilmington | 1960 |