| Humana | Louisville | 1961 |
| IBM | Armonk | June 16, 1911 |
| Illumina | San Diego | 1998 |
| Indian Motorcycle | Kings Mountain, Medina | 1901 |
| Invicta Fighting Championships | Enka | 2012 |
| Invitrogen | Carlsbad | 1987 |
| Iridium Communications | McLean | 2001 |
| IRobot | Bedford | 1990 |
| ITT Corporation | Stamford | 1920 |
| Jabil | St. Petersburg | 1966 |
| Jeep | Toledo | 1941 |
| JPMorgan Chase | New York City | 1968 |
| Juniper Networks | Sunnyvale | February 6, 1996 |
| Kaplan International Languages | London | 1967 |
| Kellanova | Chicago | February 19, 1906 |
| KeyBank | Cleveland | 1825 |
| Kingston Technology | Fountain Valley | 1987 |
| Knight's Armament Company | Titusville | 1983 |
| Knoll | East Greenville | 1938 |
| Koch, Inc. | Wichita | 1940 |
| Kodak | Rochester, New York City | 1882 |
| Kraft Heinz | Pittsburgh | 2015 |
| Kumon | Osaka | 1958 |
| Las Vegas Sands | Las Vegas, Paradise | 1937 |
| Levi Strauss & Co. | San Francisco, Levi's Plaza | 1853 |
| Liberty Mutual Insurance | Boston | 1912 |
| Lionel Corporation | New York City | 1900 |
| Lucasfilm Animation | San Francisco | May 12, 2003 |
| Lycos | Waltham | 1994 |
| Mack Trucks | Allentown, Greensboro | 1900 |
| MakerBot Industries | New York City | January 20, 2009 |
| Marmot | Santa Rosa | 1974 |
| Marriott International | Bethesda | October 8, 1993 |
| Martin Marietta | Bethesda | 1961 |
| Mastercard | Purchase | 1966 |
| McIntosh Laboratory | Binghamton, New York City | 1949 |
| Mead Johnson | Glenview | 1905 |
| Mentor Graphics | Wilsonville | 1981 |
| Merck & Co. | Rahway | 1891 |
| Merrill | New York City | January 6, 1914 |
| Mobil | Fairfax | 1966 |
| Modulus Graphite | Richmond | 1978 |
| Morgan Stanley | New York City | 1931 |
| MOS Technology | Norristown | 1969 |
| Motorola Solutions | Chicago | January 4, 2011 |
| National Geographic Partners | New York City | September 9, 2015 |
| National Instruments | Austin | 1976 |
| National Wrestling Alliance | Houston | 1948 |