| Knoll | East Greenville | 1938 |
| Koch Industries | Wichita | 1940 |
| Kohler Company | Kohler | 6 de dezembro de 1873 |
| Kroger | Cincinnati | 1882 |
| Kyndryl | Nova Iorque | — |
| Leidos | Reston | 1969 |
| Lennox International | Richardson | 1999 |
| Levi Strauss & Co. | São Francisco, Levi's Plaza | 1853 |
| Lionel Corporation | Nova Iorque | 1900 |
| LJN Toys | Nova Iorque | 1967 |
| Lucasfilm Animation | São Francisco | 12 de maio de 2003 |
| Lycos | Waltham | 1994 |
| Mack Trucks | Allentown, Greensboro | 1900 |
| Manpower | Milwaukee | 1948 |
| Marathon Oil | Houston | 1887 |
| Martin Marietta | Bethesda | 1961 |
| Massachusetts Mutual Life Insurance Company | Springfield | 1851 |
| Massey Ferguson | Duluth | 1953 |
| McAfee | Santa Clara, São José | 1987 |
| Mead Johnson | Glenview | 1905 |
| Mentor Graphics | Wilsonville | 1981 |
| MGA Entertainment | Los Angeles | 1979 |
| Milwaukee Electric Tool Corporation | Brookfield | 1924 |
| Mistwalker | Tóquio, Japão, Honolulu | 2004 |
| Mobil Oil | Fairfax | 1966 |
| Modulus Graphite | Richmond | 1978 |
| Molson Coors Brewing Company | Chicago, Montreal | 2005 |
| MoneyGram | Dallas | 1940 |
| Monster Beverage | Minnesota | 1935 |
| MOS Technology | Norristown | 1969 |
| Music Man | San Luis Obispo | 1971 |
| National Geographic Partners | Nova Iorque | 9 de setembro de 2015 |
| NBCUniversal | GE Building | 1926 |
| Netgear | São José, Dover | 1996 |
| Netscape | Mountain View | 4 de abril de 1994 |
| Neuberger Berman | Nova Iorque | 1939 |
| News Corp | Nova Iorque | 28 de junho de 2013 |
| NeXT | Palo Alto, Redwood City | 20 de junho de 1985 |
| Nike | Beaverton | 25 de janeiro de 1964 |
| Norwegian Cruise Line | Condado de Miami-Dade | 1966 |
| Nuance | Burlington | 1992 |
| Nutanix | São José | 2009 |
| O Principal Financial Group | Des Moines | 1879 |
| O.F. Mossberg & Sons | North Haven | 1919 |
| Oakley, Inc. | Foothill Ranch | 1975 |
| Ohio Valley Wrestling | Louisville | 1997 |
| Olin Corporation | Clayton | 1892 |
| Onsemi | Scottsdale | 18 de junho de 1992 |