| Guggenheim Partners | Chicago | 1999 |
| Guild | Oxnard | 1952 |
| Hamilton Watch Company | Bienna, Lancaster | 1892 |
| Handspring | Mountain View | junho 1998 |
| Hanna-Barbera | Los Angeles, Sherman Oaks Galleria | 1957 |
| Harman International | Stamford | 1980 |
| Harman Kardon | Stamford | 1953 |
| Harrah's Entertainment | Las Vegas, Paradise | 1937 |
| Hartzell Propeller | Piqua | 1917 |
| Hasbro | Pawtucket | 1923 |
| HCA Healthcare | Nashville | 1968 |
| Hearst Corporation | Torre Hearst | 13 de julho de 1920 |
| Heinemann | Londres | 1890 |
| Hercules Inc. | Wilmington | 1912 |
| Heroku | São Francisco, Califórnia | 2007 |
| Hewlett Packard Enterprise | Spring | 1 de novembro de 2015 |
| Hill & Knowlton | Nova Iorque | 1927 |
| Holiday Inn | Denham | 1952 |
| Honeywell | Charlotte | 23 de abril de 1885 |
| Hormel | Austin | 1891 |
| House of Blues | Los Angeles | 26 de novembro de 1992 |
| HRG Group | Rochester | 1953 |
| HubSpot | Cambridge | 2006 |
| Huntington Bancshares | Columbus | 1866 |
| Huntsman Corporation | Salt Lake City | 1982 |
| Hupmobile | Detroit | 1909 |
| IBM | Armonk | 16 de junho de 1911 |
| IBM Cloud Video | São Francisco | 2007 |
| IBM Research | — | 1945 |
| Id Software | Richardson | 1 de fevereiro de 1991 |
| Illinois Tool Works | Glenview | 1912 |
| ImageShack | Los Gatos | novembro 2003 |
| IMG | Nova Iorque | 1960 |
| Immediate Music | Santa Mônica | 1993 |
| Indeed.com | Austin | novembro 2004 |
| Industrial Light & Magic | São Francisco, Letterman Digital Arts Center | maio 1975 |
| Infocom | Cambridge | 22 de junho de 1979 |
| Informática | Redwood City | fevereiro 1993 |
| Ingram Micro | Irvine | 1979 |
| Instacart | São Francisco | 2012 |
| Institute for Scientific Information | Filadélfia | 1960 |
| Intel | Santa Clara | 18 de julho de 1968 |
| International Flavors & Fragrances | Nova Iorque | 1958 |
| International Harvester | Chicago | 1902 |
| International Swaps and Derivatives Association | Nova Iorque | — |
| Interpublic Group of Companies | Nova Iorque | 1961 |
| Intuit | Mountain View | 1983 |
| Intuitive Surgical | Sunnyvale | 1995 |