| 3D Systems | Rock Hill | 1986 |
| 3M | Maplewood | 1902 |
| 4Licensing Corporation | New York City | 1970 |
| A. O. Smith | Milwaukee | 1889 |
| A. T. Cross Company | Lincoln | 1846 |
| Abercrombie & Fitch | New Albany | 1892 |
| ACCO Brands | Lake Zurich | 1903 |
| Aflac | Columbus | 1955 |
| Akamai Technologies | Cambridge, Massachusetts | 1998 |
| Albemarle Corporation | Baton Rouge | 1994 |
| Alexion Pharmaceuticals | Cheshire | 1992 |
| Allen-Bradley | Milwaukee | 1903 |
| Alliant Techsystems | Arlington County | 1990 |
| Allison Transmission | Indianapolis | 1916 |
| Allstate | Northbrook | April 17, 1931 |
| Altair Engineering | Troy | 1985 |
| AMC Global Media | New York City | 1980 |
| AMC Theatres | Kansas City | 1920 |
| American Airlines | Fort Worth | April 15, 1926 |
| American Axle | Detroit | 1994 |
| American Express | New York City | 1850 |
| American International Group | New York City | 1919 |
| American Tower Corporation | Boston | 1995 |
| Ameriprise Financial | Minneapolis | 1894 |
| Ametek | Berwyn | 1930 |
| Amkor Technology | Tempe | 1968 |
| Anheuser-Busch | St. Louis | 1852 |
| Apollo Global Management | Solow Building | 1990 |
| Apollo Group | Phoenix | 1973 |
| Apple Inc. | Cupertino | April 1, 1976 |
| Arctic Cat | Plymouth | June 1960 |
| Arista Networks | Santa Clara | October 2004 |
| Arris Group | Suwanee | 1995 |
| Arrow Electronics | Englewood | 1935 |
| Arthur J. Gallagher & Co. | Itasca | 1927 |
| Ashland Inc. | Covington | 1924 |
| AT&T | Dallas | October 5, 1983 |
| Automatic Data Processing | Roseland | 1949 |
| Avid Technology | Burlington | 1987 |
| Avnet | Phoenix | 1921 |
| Aéropostale | New York City | 1973 |
| Bauer Hockey | Exeter | 1927 |
| Bausch Health | Laval, Wilmington | 1960 |
| BellSouth | Atlanta | 1984 |
| Bentley Systems | Exton | 1984 |
| Berkshire Hathaway | Omaha | 1839 |
| Best Buy | Richfield | August 22, 1966 |
| Bio-Rad Laboratories | Hercules | 1952 |