| GE Transportation | Chicago, Heller International Building | 1907 |
| General American Transportation Corporation | Chicago | 1933 |
| General Atomics | San Diego | 1955 |
| General Dynamics | Reston | February 21, 1952 |
| General Dynamics Electric Boat | Groton | 1899 |
| General Tire | Fort Mill | 1915 |
| Gensler | San Francisco | 1965 |
| Genzyme | Cambridge | 1981 |
| GeoEye | Herndon | 1992 |
| Gerber Legendary Blades | Tigard | 1939 |
| Getty Oil | East Meadow | 1964 |
| Giant Sparrow | Santa Monica | March 22, 2009 |
| Gibson Brands | Tennessee, Nashville | 1902 |
| GlassBridge Enterprises | Oakdale | 1996 |
| Glassdoor | Austin, San Francisco, Mill Valley | June 2007 |
| Global Electric Motorcars | Fargo | 1992 |
| Global Infrastructure Partners | New York City | May 2006 |
| Gloria Jean's Coffees | Castle Hill | 1979 |
| Glu Mobile | San Francisco | 2005 |
| GoDaddy | Tempe | 1997 |
| Golden Boy Promotions | Los Angeles | 2002 |
| Goodrich Corporation | Charlotte | 1870 |
| Goodyear Tire and Rubber Company | Akron | August 29, 1898 |
| Graflex | Rochester | 1889 |
| Gremlin Industries | San Diego | 1973 |
| Greyhound Lines | One Dallas Center | 1914 |
| Guardian Industries | Auburn Hills | 1932 |
| Guggenheim Partners | Chicago | 1999 |
| Hanesbrands | Winston-Salem | January 1, 2000 |
| Hasbro | Pawtucket | 1923 |
| Henry Ford Company | Detroit | 1901 |
| Herman Miller | Zeeland | 1923 |
| Hess Corporation | New York City | 1919 |
| Hewlett Packard Enterprise | Spring | November 1, 2015 |
| Hewlett Packard Enterprise Services | Plano | June 27, 1962 |
| Hewlett-Packard | Palo Alto | July 2, 1939 |
| HGST | San Jose | 2003 |
| Holland America Line | Seattle | 1873 |
| Honeywell Aerospace | Phoenix | 1936 |
| House of Blues | Los Angeles | November 26, 1992 |
| HowStuffWorks | Atlanta | July 11, 1998 |
| HubSpot | Cambridge | 2006 |
| Hudson Motor Car Company | Detroit | 1909 |
| Hughes Helicopters | Mesa, Culver City | 1947 |
| Humana | Louisville | 1961 |
| Huntington Bancshares | Columbus | 1866 |
| Huntsman Corporation | Salt Lake City | 1982 |
| Hupmobile | Detroit | 1909 |