| Jcroductions | 2020 | — | 1 |
| Jean Doumanian Productions | — | — | 1 |
| Jim Henson Home Entertainment | 1981 | — | 1 |
| Jim Henson Television | 1997 | — | 1 |
| Joseph M. Schenck Productions | — | — | 1 |
| Jules Jordan Productions | — | — | 1 |
| Julian Blaustein productions | — | — | 1 |
| Just Vision | 2003 | — | 1 |
| Kanbar Entertainment | 2002 | — | 1 |
| Katalyst Films | — | — | 1 |
| Katalyst Media | 2000 | — | 1 |
| Kay-Bee Pictures | 1912 | — | 1 |
| Kenner Products | 1946 | 2000 | 1 |
| Kimco | — | — | 1 |
| King World Productions | 1964 | 2007 | 1 |
| Kings Road Entertainment | — | — | 1 |
| Kintop Pictures | — | — | 1 |
| KnowWonder | 1996 | — | 1 |
| Kopelson Entertainment | — | — | 1 |
| KQED | June 1953 | — | 1 |
| Ladies' Home Journal | 1883 | April 24, 2014 | 1 |
| Lat-Lon, LLC | 1999 | — | 1 |
| Left/Right Productions | 2006 | — | 1 |
| Legend Films | August 2001 | — | 1 |
| Limelight | 1962 | — | 1 |
| Little Stranger | January 5, 2001 | — | 1 |
| Lockheed Corporation | 1970 | 1995 | 1 |
| Logo TV | June 30, 2005 | — | 1 |
| Loma Vista Recordings | 2012 | — | 1 |
| London Gunn | — | — | 1 |
| Lone Star Funds | 1995 | — | 1 |
| Lonely Cat Productions | — | — | 1 |
| Los Angeles Daily News | 1911 | — | 1 |
| Louisville and Nashville Railroad | 1850 | 1982 | 1 |
| Lutheran Hour Ministries | 1917 | — | 1 |
| Magenta Light Studios | March 8, 2024 | — | 1 |
| Majestic Motion Picture Company | — | — | 1 |
| Maljack Productions | — | — | 1 |
| Manex Visual Effects | — | — | 1 |
| Manifold Productions | 1977 | — | 1 |
| Marfa Peach Company | — | — | 1 |
| Matt Tolmach Productions | — | — | 1 |
| Mattel Television | March 30, 2016 | — | 1 |
| Maurice Tourneur Productions | 1918 | — | 1 |
| Maxim | May 1995 | — | 1 |
| MCA Television | 1951 | — | 1 |
| McGraw-Hill Education | 1888 | — | 1 |
| MediaNews Group | 1983 | — | 1 |
| Men.com | 2003 | — | 1 |
| Merv Griffin Entertainment | 1996 | — | 1 |
| Metro | 1987 | — | 1 |
| Metro-Goldwyn-Mayer cartoon department | 1937 | 1957 | 1 |
| Metromedia | 1956 | 1997 | 1 |
| Metropolitan Opera House | — | — | 1 |
| MGM Television | 1956 | — | 1 |
| Midway Games | 1988 | 2009 | 1 |
| Mike Adriano Media | — | — | 1 |
| Miko Lee Productions | — | — | 1 |
| Milfy | 2023 | — | 1 |
| Millar/Gough Ink | 1995 | — | 1 |
| Mills James | 1984 | — | 1 |
| Minnow Mountain | — | — | 1 |
| Miracle Pictures | — | — | 1 |
| Mojave Desert | — | — | 1 |
| Monarch Media (United States) | — | — | 1 |
| Moonbow Pictures | November 19, 2018 | — | 1 |
| MS NOW | July 15, 1996 | — | 1 |
| MTM Enterprises | 1969 | 1998 | 1 |
| MTV Entertainment Studios | 1991 | August 7, 2025 | 1 |
| Myriapod Productions | — | — | 1 |
| Naptown Productions | — | — | 1 |
| National Endowment for the Humanities | September 29, 1965 | — | 1 |
| National Film Corporation of America | 1915 | — | 1 |
| NBA Entertainment | — | — | 1 |
| NBC News Studios | — | — | 1 |
| New Tang Dynasty Television | 2001 | — | 1 |
| New York University | 1831 | — | 1 |
| New York University Tisch School of the Arts | 1965 | — | 1 |
| New Yorker Films | 1965 | — | 1 |
| Oceanic Preservation Society | 2005 | — | 1 |
| OddLot Entertainment | 2001 | 2015 | 1 |
| One Astor Plaza | 1972 | — | 1 |
| Orion Classics | 1982 | — | 1 |
| Orlando Film Festival | 2005 | — | 1 |
| Orona/Stevens | — | — | 1 |
| Pacific Research Institute | 1979 | — | 1 |
| Pacific Street Films | 1969 | — | 1 |
| Pantheon Books | 1942 | — | 1 |
| Paramount Television Studios | August 8, 2025 | August 18, 2024 | 1 |
| Penguin Productions | — | — | 1 |
| Penn/Bright Entertainment | — | — | 1 |
| PepFilmStudios | — | — | 1 |
| Pilgrim Media Group | 1997 | — | 1 |
| Pinnacle Entertainment | 1938 | — | 1 |
| Playhouse Disney | February 1999 | — | 1 |
| Preferred Pictures | 1920 | 1926 | 1 |
| Prospect Park | 2008 | — | 1 |
| Protestant Film Commission | — | — | 1 |
| Provident Films | — | — | 1 |
| Psychological Warfare Division | November 1942 | — | 1 |