| Argus Film Produktie | Netherlands | — | — | 1 |
| Ark Resources Entertainment | Nigeria | 2002 | — | 1 |
| Armadillo Film | Netherlands | 2001 | — | 1 |
| Armenia 1 | Armenia | November 29, 1956 | — | 1 |
| Army Pictorial Service | United States | — | — | 1 |
| Arpa Films | Spain | — | — | 1 |
| ARRAY | — | 2010 | — | 1 |
| Arrow Films | — | — | — | 1 |
| Arrow-Film | Norway | 1964 | — | 1 |
| Ars Media | Slovakia | — | — | 1 |
| Arsmedia | Slovenia | — | — | 1 |
| Art Aia - La Dolce Berlin | Germany | — | — | 1 |
| Art Aia-Creatives / In / Residence | Italy | — | — | 1 |
| Art for The World | — | 1995 | — | 1 |
| Art Institute of Chicago | United States | 1879 | — | 1 |
| Art-O-Graf | United States | 1919 | — | 1 |
| Artbox | Iceland | — | — | 1 |
| Artemis Films | Canada | — | — | 1 |
| Artis Film | Romania | — | — | 1 |
| Artist Studio | South Korea | — | — | 1 |
| Artistfilm | Sweden | — | — | 1 |
| Artland | Japan | September 14, 1978 | 2015 | 1 |
| Arts Council of Wales | United Kingdom | 1946 | — | 1 |
| Artza Productions | Israel | 2006 | — | 1 |
| Artédis | France | 1983 | — | 1 |
| As Films Producción | Spain | — | — | 1 |
| ASA Film | Denmark | 1936 | — | 1 |
| Asahi Broadcasting Group Holdings | Japan | March 15, 1951 | — | 1 |
| Ascot Elite Entertainment Group | Germany | 1928 | — | 1 |
| Askania Media | Germany | 1997 | — | 1 |
| Aspartame Jack | Canada | — | — | 1 |
| Aspekt Telefilm | Germany | 1974 | — | 1 |
| Aspide 1 UG | Germany | — | — | 1 |
| Associated-Rediffusion | United Kingdom | September 22, 1955 | — | 1 |
| Association of Malayalam Movie Artists | India | — | — | 1 |
| AST Studio | Japan | — | — | 1 |
| Astor Pictures | United States | 1930 | 1963 | 1 |
| Asymmetrical Productions | United States | 1993 | — | 1 |
| AT-Prod | Belgium | 1994 | — | 1 |
| Atlas Film Company | United States | — | — | 1 |
| Atlântida Cinematográfica | Brazil | September 18, 1941 | — | 1 |
| ATO Records | United States | 2000 | — | 1 |
| Atomfilm | Norway | — | August 4, 2025 | 1 |
| ATR | Ukraine | 2015 | — | 1 |
| Atria | — | 1953 | 1998 | 1 |
| Attackers | Japan | 1996 | — | 1 |
| Attica Art Productions | Greece | — | — | 1 |
| Audax Films | — | 2013 | — | 1 |
| Audiovisual Archive of the Democratic and Labour Movement | Italy | — | — | 1 |
| August Entertainment | United States | 1988 | — | 1 |
| Augustus Film | Netherlands | — | — | 1 |
| Australian Children's Television Foundation | Australia | 1982 | — | 1 |
| Australian Film Institute | Australia | November 1958 | — | 1 |
| Australian Life Biograph Company | Australia | 1911 | — | 1 |
| Australian Union Conference of Seventh-day Adventists | Australia | 2001 | — | 1 |
| Avalon Produkcija | North Macedonia | — | — | 1 |
| Avant-Film | Norway | April 28, 1959 | — | 1 |
| Avatar Studios | — | 2021 | — | 1 |
| Avaton Films | Greece | 2017 | — | 1 |
| Avex Entertainment | Japan | April 2007 | 2014 | 1 |
| Avex Music Creative | Japan | October 1997 | — | 1 |
| AXS TV | United States | 2001 | — | 1 |
| Aywon Film Corporation | United States | — | — | 1 |
| Azad Azerbaijan TV | Azerbaijan | 2000 | — | 1 |
| Azalea Producciones | Spain | — | — | 1 |
| Azar Film | Pahlavi Iran | — | — | 1 |
| Aziani | United States | 2005 | — | 1 |
| B Production | Slovakia | May 18, 2019 | — | 1 |
| B's International | Japan | 1990 | — | 1 |
| B. A. Entertainment | South Korea | — | — | 1 |
| B62 Studios | India | 2021 | — | 1 |
| B92 | Serbia | 1989 | — | 1 |
| Babel Label | Japan | 2010 | — | 1 |
| Baby Einstein | — | 1996 | — | 1 |
| Babyjane Productions | Ireland | — | — | 1 |
| Babylon'13 | Ukraine | 2013 | — | 1 |
| Backmann & Hoderoff | Finland | — | — | 1 |
| Bad Monkey | India | 2005 | — | 1 |
| Baku Media Center | Azerbaijan | 2013 | — | 1 |
| Balance Media Entertainment | Spain | — | — | 1 |
| Balboa 2 | Denmark | 1997 | January 24, 2008 | 1 |
| Baldur Film | Iceland | — | — | 1 |
| Balti Video | Estonia | February 3, 1995 | — | 1 |
| Bandai Namco Entertainment | Japan | March 31, 2006 | — | 1 |
| BandLab Technologies | Singapore | — | — | 1 |
| Bang Bros | United States | 2004 | — | 1 |
| Bang Zoom! Entertainment | United States | 1993 | — | 1 |
| Bang! | United States | — | — | 1 |
| Banijay Nordics | — | — | — | 1 |
| Bankable Productions | United States | — | — | 1 |
| Baozou | People's Republic of China | 2008 | — | 1 |
| Baram Pictures | South Korea | — | — | 1 |
| Barber-Birnbaum | United States | — | — | 1 |
| Barcinógrafo | Spain | 1913 | 1918 | 1 |
| Barefoot Films | Germany | 2004 | — | 1 |
| Barret Cooperativa | Spain | 2008 | — | 1 |
| Barré Studio | United States | 1914 | — | 1 |
| Barunson Studio | South Korea | — | — | 1 |
| Base FX | — | 2006 | — | 1 |
| Basement Films | United Kingdom | 2022 | — | 1 |