| Ion Storm | Austin | 1996 |
| Iridium | McLean | 2001 |
| Iron Crown Enterprises | Virgínia | 1980 |
| IShares | São Francisco | 2000 |
| Issuu | Palo Alto | 2007 |
| Ithaca Gun Company | Upper Sandusky | 1880 |
| J. G. Brill Company | Filadélfia | 1868 |
| J.Crew | 225 Liberty Street | 1983 |
| Jack Daniel's | Jack Daniel's Distillery | 1866 |
| Jacobs Solutions | Harwood Center | 1947 |
| Jacuzzi | Chino Hills | 1917 |
| Jamba Juice | Frisco | 1990 |
| Jeep | Toledo | 1941 |
| Jet | — | — |
| Jimmy John's | Champaign | 1983 |
| Johns-Manville | Denver | 1858 |
| Johnson & Johnson | New Brunswick | 1886 |
| JPMorgan Chase | Nova Iorque | 1968 |
| Juniper Networks | Sunnyvale | 6 de fevereiro de 1996 |
| Kaggle | São Francisco | abril 2010 |
| Kahr Arms | condado de Pike | 1995 |
| Kaiser Jeep | Toledo | 1953 |
| Kaiser Permanente | Oakland | 1945 |
| Kaltura | Nova Iorque, Nova Iorque | 2006 |
| Kaplan International Languages | Londres | 1967 |
| KAYAK | Stamford | 2004 |
| Kaypro | San Diego | 1981 |
| Kel-Tec | Cocoa | 1991 |
| Kellanova | Chicago | 19 de fevereiro de 1906 |
| Kenner Products | Cincinnati | 1946 |
| Keysight | Santa Rosa | 2014 |
| King of the Cage | Rancho Cucamonga | 1998 |
| KLA Tencor | Milpitas | 1997 |
| Kohlberg Kravis Roberts | Nova Iorque | 1976 |
| Kohl´s | Menomonee Falls | 1962 |
| Koss Corporation | Milwaukee | 1953 |
| Kroger | Cincinnati | 1882 |
| Kumon | Osaka | 1958 |
| L3Harris Technologies | Melbourne | 29 de junho de 2019 |
| La-Z-Boy | Monroe | 1927 |
| Las Vegas Sands | Las Vegas, Paradise | 1937 |
| Lattice Semiconductor | Portland, Hillsboro | 1983 |
| Lazard | Nova Iorque | 12 de julho de 1848 |
| Lear Corporation | Southfield | 1917 |
| Learjet | Wichita | 1962 |
| Leatherman | Portland | 1983 |
| Lee | Kansas, Merriam | 1889 |
| Legacy Fighting Championship | Texas, Estados Unidos | 2016 |