| IQVIA Holdings, Inc. | Danbury, Durham | 2016 |
| Iridium | McLean | 2001 |
| Iron Crown Enterprises | Virgínia | 1980 |
| ITT Corporation | Stamford | 1920 |
| Jabil | São Petersburgo | 1966 |
| Jack Daniel's | Jack Daniel's Distillery | 1866 |
| Jacobs Solutions | Harwood Center | 1947 |
| Jacuzzi | Chino Hills | 1917 |
| JBL | Northridge | 1946 |
| Jelly Belly Candy Company | Fairfield | 1898 |
| John Broadwood and Sons Limited | Nova Iorque, Londres | 1732 |
| John Hancock Insurance | Boston | 1862 |
| Johnson & Johnson | New Brunswick | 1886 |
| Jones Lang LaSalle | Chicago, Aon Center | 1783 |
| JPMorgan Chase | Nova Iorque | 1968 |
| Juul | São Francisco | julho 2017 |
| K-R-I-T Motor Car Company | Detroit | 1909 |
| Kaggle | São Francisco | abril 2010 |
| Kaiser Jeep | Toledo | 1953 |
| Kaiser Permanente | Oakland | 1945 |
| Kaplan International Languages | Londres | 1967 |
| Kate Spade New York | Nova Iorque | 1993 |
| KAYAK | Stamford | 2004 |
| Kaypro | San Diego | 1981 |
| Kel-Tec | Cocoa | 1991 |
| Kimberly-Clark | Irving | 1928 |
| Kirby Company | Cleveland | 1914 |
| KLA Tencor | Milpitas | 1997 |
| Kleiner Perkins | Menlo Park | 1972 |
| Kmart | Detroit | 1962 |
| Kohl´s | Menomonee Falls | 1962 |
| Lab126 | Cupertino | 2004 |
| Lam Research | Fremont | 1980 |
| Landmark Worldwide | São Francisco | 1991 |
| Las Vegas Sands | Las Vegas, Paradise | 1937 |
| Lattice Semiconductor | Portland, Hillsboro | 1983 |
| Lay's | — | 1934 |
| Lazard | Nova Iorque | 12 de julho de 1848 |
| LeCroy Corporation | Chestnut Ridge | 1964 |
| Lee | Kansas, Merriam | 1889 |
| Legacy Fighting Championship | Texas, Estados Unidos | 2016 |
| Lime | San Mateo | janeiro 2017 |
| Linden Lab | São Francisco | 1999 |
| Lionel Corporation | Nova Iorque | 1900 |
| Loews Cineplex Entertainment | Nova Iorque | 1910 |
| Logitech | Lausana, Newark | 2 de outubro de 1981 |
| Lonely Planet | Melbourne | 1972 |
| Lowepro | Petaluma | 1967 |