| Kearney | Chicago | 1926 |
| Keurig Dr Pepper | Burlington | 2018 |
| KeyBank | Cleveland | 1825 |
| Kmart | Detroit | 1962 |
| Knoll | East Greenville | 1938 |
| Koch, Inc. | Wichita | 1940 |
| Kodak | Rochester, New York City | 1882 |
| Kohler Company | Kohler | December 6, 1873 |
| Kroger | Cincinnati | 1882 |
| Landmark Worldwide | San Francisco | 1991 |
| Las Vegas Sands | Las Vegas, Paradise | 1937 |
| LeCroy Corporation | Chestnut Ridge | 1964 |
| LenovoEMC | San Diego | 1980 |
| Level 3 Communications | Frankfurt | 1985 |
| Levi Strauss & Co. | San Francisco, Levi's Plaza | 1853 |
| Lexmark | Lexington | March 27, 1991 |
| Lionbridge | Waltham | 1996 |
| Litton Industries | Milwaukee | 1953 |
| Mack Trucks | Allentown, Greensboro | 1900 |
| Macromedia | San Francisco | February 25, 1992 |
| MakerBot Industries | New York City | January 20, 2009 |
| Marathon Oil | Houston | 1887 |
| Marmot | Santa Rosa | 1974 |
| McGraw-Hill Education | New York City | 1888 |
| McIntosh Laboratory | Binghamton, New York City | 1949 |
| McKesson Corporation | Irving | 1994 |
| Microchip Technology | Chandler | 1989 |
| Midway Games | Chicago | 1988 |
| Monster Inc. | Brisbane | 1978 |
| Morgan Stanley | New York City | 1931 |
| MOS Technology | Norristown | 1969 |
| Motorola Solutions | Chicago | January 4, 2011 |
| MPEG LA | Denver | 1996 |
| National Oilwell Varco | Houston | 1862 |
| National Wrestling Alliance | Houston | 1948 |
| NBCUniversal | 30 Rockefeller Plaza | 1926 |
| NCR Corporation | Atlanta, Augsburg | 1884 |
| Netflix, Inc. | Los Gatos | August 29, 1997 |
| NetSuite | Austin | 1998 |
| Network Solutions | Herndon | 1979 |
| News Corp | New York City | June 28, 2013 |
| NexGen | Milpitas | 1986 |
| NeXT | Palo Alto, Redwood City | June 20, 1985 |
| Nike | Beaverton | January 25, 1964 |
| Noble Energy | Houston | 1932 |
| Oakley, Inc. | Foothill Ranch | 1975 |
| Office Depot | Boca Raton | 1986 |
| Ohio Valley Wrestling | Louisville | 1997 |