| Jelly Belly Candy Company | Fairfield | 1898 |
| Jeppesen | Inverness | 1934 |
| Johns-Manville | Denver | 1858 |
| Johnson & Johnson | New Brunswick | 1886 |
| Juniper Networks | Sunnyvale | 6 de fevereiro de 1996 |
| K-Swiss | Westlake Village | 1966 |
| Kahr Arms | condado de Pike | 1995 |
| Kaiser Jeep | Toledo | 1953 |
| Kate Spade New York | Nova Iorque | 1993 |
| Kaypro | San Diego | 1981 |
| Keds | Rockford | 1916 |
| Kellanova | Chicago | 19 de fevereiro de 1906 |
| Kenner Products | Cincinnati | 1946 |
| KeyBank | Cleveland | 1825 |
| Kleiner Perkins | Menlo Park | 1972 |
| Kmart | Detroit | 1962 |
| Knoll | East Greenville | 1938 |
| Kohler Company | Kohler | 6 de dezembro de 1873 |
| Kohl´s | Menomonee Falls | 1962 |
| Konecranes | Hyvinkää | 1994 |
| Kumon | Osaka | 1958 |
| La Senza | Montreal | 1990 |
| La-Z-Boy | Monroe | 1927 |
| Las Vegas Sands | Las Vegas, Paradise | 1937 |
| Lay's | — | 1934 |
| Lazard | Nova Iorque | 12 de julho de 1848 |
| Learjet | Wichita | 1962 |
| Leatherman | Portland | 1983 |
| LeCroy Corporation | Chestnut Ridge | 1964 |
| Legacy Fighting Championship | Texas, Estados Unidos | 2016 |
| Legg Mason Tennis Classic | — | 1969 |
| Leidos | Reston | 1969 |
| Lennox International | Richardson | 1999 |
| Lexar | Milpitas | 1996 |
| Lexmark | Lexington | 27 de março de 1991 |
| Liberty Mutual Group | Boston | 1912 |
| Lime | San Mateo | janeiro 2017 |
| Linden Lab | São Francisco | 1999 |
| Line 6 | Calabasas | 1996 |
| Litton Industries | Milwaukee | 1953 |
| LJN Toys | Nova Iorque | 1967 |
| Lollapalooza | — | 1991 |
| Long Island Rail Road | Jamaica | 1834 |
| Lord & Taylor | Nova Iorque | 1826 |
| Lowepro | Petaluma | 1967 |
| Lucasfilm Animation | São Francisco | 12 de maio de 2003 |
| Lytro | Mountain View | 2006 |
| M&T Bank | Buffalo | 1856 |