| Maecenas Film- und Fernsehproduktion | Germany | — | — | 1 |
| Maeda Corporation | Japan | 1919 | — | 1 |
| MAG Yapım | Turkey | 2023 | — | 1 |
| Magellan Films | Belgium | — | — | 1 |
| Magenta Light Studios | United States | March 8, 2024 | — | 1 |
| Magic | Germany | — | — | 1 |
| Magnéto Presse | France | July 24, 2008 | — | 1 |
| Mahaka Media | Indonesia | 1992 | — | 1 |
| Mahakarya Pictures | Indonesia | 2009 | — | 1 |
| Mainframe Films and Television Productions | — | 1991 | — | 1 |
| Mainz University of Applied Sciences | Germany | 1971 | — | 1 |
| Maison 4:3 | Canada | July 16, 2014 | — | 1 |
| Majestic Motion Picture Company | United States | — | — | 1 |
| Makino Film Productions | Japan | 1923 | — | 1 |
| Maljack Productions | United States | — | — | 1 |
| Malva | Ukraine | 1993 | — | 1 |
| Manchu Entertainment | — | — | — | 1 |
| Manderlay | United Kingdom | — | — | 1 |
| Mandragora Movies | Romania | — | — | 1 |
| Manex Visual Effects | United States | — | — | 1 |
| Manfred Durniok Produktion | Germany | — | — | 1 |
| Manga Entertainment | United Kingdom | 1987 | — | 1 |
| Manglobe | Japan | 2002 | September 30, 2015 | 1 |
| Manifold Productions | United States | 1977 | — | 1 |
| Manigolda Film | France | — | — | 1 |
| Mano Film | Switzerland | 2001 | — | 1 |
| Manoli Films | — | 2000 | 2002 | 1 |
| Manslaughter | United Kingdom | — | — | 1 |
| ManyVids | Canada | 2014 | — | 1 |
| Marea Films S.A. | Spain | — | — | 1 |
| Marfa Peach Company | United States | — | — | 1 |
| Marmalade Films | Belgium | November 29, 2013 | — | 1 |
| Mars Entertainment | Belgium | — | — | 1 |
| Mars-Film | Germany | — | — | 1 |
| Massa d’Or Produccions | Spain | 1992 | — | 1 |
| Matador Pictures | United Kingdom | — | — | 1 |
| Mate Production | Spain | — | — | 1 |
| Matt Tolmach Productions | United States | — | — | 1 |
| Mattel Television | United States | March 30, 2016 | — | 1 |
| Maurice Tourneur Productions | United States | 1918 | — | 1 |
| Maverick | — | 1992 | — | 1 |
| Max Productions | Greece | — | — | 1 |
| Maxam | Japan | June 24, 1991 | — | 1 |
| Maxim | United States | May 1995 | — | 1 |
| Maxlab Cinemas and Entertainments | India | 2009 | — | 1 |
| MAXstream | Indonesia | June 2018 | — | 1 |
| Maïa Films | France | — | — | 1 |
| MBC Group | Saudi Arabia | September 18, 1991 | — | 1 |
| MBK Entertainment | South Korea | 2006 | — | 1 |
| MBP | Germany | — | — | 1 |
| MCA Television | United States | 1951 | — | 1 |
| McGraw-Hill Education | United States | 1888 | — | 1 |
| Mechanix Film | Norway | August 15, 2009 | — | 1 |
| Media Asia Film Distribution Company | — | October 5, 1993 | — | 1 |
| Media Cooperation One | Germany | — | — | 1 |
| Media Development Authority | Singapore | 2003 | — | 1 |
| Media Factory | Japan | December 1986 | — | 1 |
| Media Mix Japan | Japan | April 2, 1993 | — | 1 |
| Mediagjøglerne | Norway | — | — | 1 |
| MediaNews Group | United States | 1983 | — | 1 |
| Mediaset Premium | Italy | January 20, 2005 | June 2019 | 1 |
| Mediawan Finland | Finland | 2003 | — | 1 |
| Medienprojekt Wuppertal | Germany | — | — | 1 |
| Medset Film | France | 2016 | — | 1 |
| Mega Kreasi Films | Indonesia | — | — | 1 |
| Memento Distribution | France | March 4, 2003 | — | 1 |
| Memfis Film Rights5 | Sweden | March 4, 2004 | May 4, 2021 | 1 |
| Men.com | United States | 2003 | — | 1 |
| Merkur Produksjon | Norway | 1939 | — | 1 |
| Merseyside Film Production Fund | United Kingdom | — | — | 1 |
| Merv Griffin Entertainment | United States | 1996 | — | 1 |
| Met Film Production | — | — | — | 1 |
| Meta Film | Denmark | December 27, 2012 | — | 1 |
| Metahaven | Netherlands | — | — | 1 |
| Metro | United States | 1987 | — | 1 |
| Metro International | — | 1995 | — | 1 |
| Metro-Goldwyn-Mayer cartoon department | United States | 1937 | 1957 | 1 |
| Metromedia | United States | 1956 | 1997 | 1 |
| Metromuster | Spain | 2010 | June 26, 2020 | 1 |
| Metronom Studio | Russia | — | — | 1 |
| Metropolitan Opera House | United States | — | — | 1 |
| Mexican Association of Independent Filmmakers | Mexico | 1993 | — | 1 |
| MGM Television | United States | 1956 | — | 1 |
| MHD Concern Film | Netherlands | 1934 | 1934 | 1 |
| MIA FILM | Czech Republic | February 25, 2010 | — | 1 |
| Micha's Films | Israel | 2009 | — | 1 |
| MICHAEL - Střední škola, Gymnázium a Vyšší odborná škola | Czech Republic | September 10, 1997 | — | 1 |
| Midway Games | United States | 1988 | 2009 | 1 |
| Mifal HaPayis | Israel | 1951 | — | 1 |
| Mike Adriano Media | United States | — | — | 1 |
| Miko Lee Productions | United States | — | — | 1 |
| Mikrofilm | Norway | October 16, 1996 | — | 1 |
| Milestone Production | Canada | — | — | 1 |
| Milfy | United States | 2023 | — | 1 |
| Milk and Honey Pictures | Czech Republic | February 29, 2000 | — | 1 |
| Milk Pictures | South Korea | — | — | 1 |
| Mill Film | — | — | — | 1 |
| Millar/Gough Ink | United States | 1995 | — | 1 |
| Millennium Film Oy | Finland | — | — | 1 |
| Mills James | United States | 1984 | — | 1 |