| Capital Group Companies | Los Angeles | 1931 |
| Capital One | McLean | 1994 |
| Captain D's | Nashville | 15 de agosto de 1969 |
| Carfax | Centreville | 1984 |
| Cargill | Minnetonka | 1865 |
| Carrier Global | Farmington | 26 de junho de 1915 |
| Cash App | — | 15 de outubro de 2013 |
| Caterpillar Inc. | Irving | 1925 |
| CBRE, Inc. | Dallas, Los Angeles | 1906 |
| CBS Corporation | CBS Building | 30 de novembro de 1997 |
| Cedar Fair | Sandusky | 1983 |
| Celanese Corporation | Irving | 1999 |
| Celera Corporation | Rockville, Alameda | maio 1998 |
| Celestron | Torrance | 1960 |
| Celgene | Summit | 1986 |
| Cengage Learning | Stamford | 2000 |
| Cerberus Capital Management | Nova Iorque | 1992 |
| CF Industries | Deerfield, Deerfield | 1946 |
| Champ Car | — | 1979 |
| Charlton Comics | Derby | 1945 |
| Chicago Mercantile Exchange | Chicago | 1898 |
| Chicago, Rock Island and Pacific Railroad | Chicago | 1866 |
| Chikara | Filadélfia | 2002 |
| Chipotle Mexican Grill | Denver, Newport Beach | 13 de julho de 1993 |
| Chips and Technologies | Milpitas | 1985 |
| Chobani | Norwich | 2005 |
| Church & Dwight | Ewing | 1846 |
| Cirrus Logic | Austin | 1984 |
| Cisco Systems | São José | 1984 |
| CIT Group Incorporated | Nova Iorque | 1908 |
| Citgo | Houston | 1910 |
| Citizens Financial Group | Providence | 1954 |
| Citrix Systems | Fort Lauderdale | 1989 |
| Claris | Cupertino | 1987 |
| Coach New York | Nova Iorque | 1941 |
| Coda Automotive | Los Angeles | 2009 |
| Codecademy | Nova Iorque | 2011 |
| Cole Haan | Greenland | 1928 |
| Coleco | West Hartford | 1932 |
| Coleman (marca) | Wichita | 1900 |
| Colt's Manufacturing Company | West Hartford | 1855 |
| Comcast | Filadélfia | 28 de junho de 1963 |
| Comerica | Dallas | 1849 |
| Commodore International | West Chester | 10 de outubro de 1958 |
| CommScope | Claremont | 1976 |
| Compaq | Houston | 16 de fevereiro de 1982 |
| ComScore | Reston | 1999 |
| ConocoPhillips | Houston | 1875 |