| International Swaps and Derivatives Association | Nova Iorque | — |
| Interpublic Group of Companies | Nova Iorque | 1961 |
| Intuit | Mountain View | 1983 |
| Intuitive Machines | Houston | 2013 |
| Intuitive Surgical | Sunnyvale | 1995 |
| Ion Storm | Austin | 1996 |
| IQVIA Holdings, Inc. | Danbury, Durham | 2016 |
| Iridium | McLean | 2001 |
| Iron Crown Enterprises | Virgínia | 1980 |
| Issuu | Palo Alto | 2007 |
| Ithaca Gun Company | Upper Sandusky | 1880 |
| ITT Corporation | Stamford | 1920 |
| J. C. Penney | Plano | 1902 |
| J.Crew | 225 Liberty Street | 1983 |
| Jack Daniel's | Jack Daniel's Distillery | 1866 |
| Jakks Pacific | Malibu | 1995 |
| Jasc Software | Eden Prairie | 1990 |
| JBL | Northridge | 1946 |
| Jeep | Toledo | 1941 |
| Jim Crockett Promotions | Charlotte | 1931 |
| John Hancock Insurance | Boston | 1862 |
| Johns-Manville | Denver | 1858 |
| Johnson & Johnson | New Brunswick | 1886 |
| JPMorgan Chase | Nova Iorque | 1968 |
| K-Swiss | Westlake Village | 1966 |
| Kaggle | São Francisco | abril 2010 |
| Keds | Rockford | 1916 |
| Kellanova | Chicago | 19 de fevereiro de 1906 |
| Kelvinator | — | 1914 |
| KeyBank | Cleveland | 1825 |
| Keysight | Santa Rosa | 2014 |
| Kimberly-Clark | Irving | 1928 |
| King of the Cage | Rancho Cucamonga | 1998 |
| Kleiner Perkins | Menlo Park | 1972 |
| Kmart | Detroit | 1962 |
| Kohler Company | Kohler | 6 de dezembro de 1873 |
| Konecranes | Hyvinkää | 1994 |
| Kraft Heinz Company | Pittsburgh | 2015 |
| L3Harris Technologies | Melbourne | 29 de junho de 2019 |
| La-Z-Boy | Monroe | 1927 |
| Lab126 | Cupertino | 2004 |
| Lam Research | Fremont | 1980 |
| Las Vegas Sands | Las Vegas, Paradise | 1937 |
| Lattice Semiconductor | Portland, Hillsboro | 1983 |
| LeCroy Corporation | Chestnut Ridge | 1964 |
| Legg Mason Tennis Classic | — | 1969 |
| Levi Strauss & Co. | São Francisco, Levi's Plaza | 1853 |
| Lexicon | Woodbury | 1971 |