| Ajiado | Japan | 1978 | — | 1 |
| Akanga Film Asia | Singapore | — | — | 1 |
| Akis Bado | Lithuania | 2019 | — | 1 |
| AKOM | South Korea | 1985 | — | 1 |
| Akufen | Canada | — | — | 1 |
| Al Jazeera Balkans | Bosnia and Herzegovina | 2011 | 2025 | 1 |
| Al Jazeera Documentary Channel | Qatar | 2007 | — | 1 |
| Ala Bianca Group S.r.l. | Italy | 1990 | — | 1 |
| Alan Landsburg Productions | United States | 1971 | 1994 | 1 |
| Alatas Films | Greece | — | — | 1 |
| Albanian General Vision | Albania | — | — | 1 |
| Albanian National Center of Cinematography | Albania | — | — | 1 |
| Albena Produccions | — | — | — | 1 |
| Albert Bonniers Förlag | Sweden | 1837 | — | 1 |
| Aldo, Giovanni & Giacomo | Italy | — | — | 1 |
| ALEF Film & Media Group | Slovakia | 1997 | — | 1 |
| Alert film | Norway | — | — | 1 |
| Alexander Nanau Production | Romania | — | — | 1 |
| Alexandros Film | Greece | — | — | 1 |
| Alfa Pictures | Spain | — | — | 1 |
| Algefa | Germany | 1936 | 1955 | 1 |
| Alice Films | — | — | — | 1 |
| Alien Films Entertainment | Romania | — | — | 1 |
| Alien Internet Services | Belgium | 2012 | — | 1 |
| Align | United States | — | — | 1 |
| All Things Comedy | United States | October 2012 | — | 1 |
| All Yours Film | Netherlands | — | — | 1 |
| Allarts | Netherlands | — | — | 1 |
| Allary Film | Germany | 1984 | — | 1 |
| Allians Film | Sweden | — | — | 1 |
| Alligator Film | Norway | — | — | 1 |
| AllMusic | United States | 1991 | — | 1 |
| Allspark Pictures | — | May 2008 | 2020 | 1 |
| Alpha Films | France | — | — | 1 |
| Alpha TV | Greece | January 26, 1996 | — | 1 |
| Alpha-i | Bangladesh | — | — | 1 |
| Alquimia Cinema | Spain | — | — | 1 |
| Alta Loma Films | France | December 1999 | — | 1 |
| Alta Vista | Italy | — | — | 1 |
| Altamira Pictures | Japan | 1993 | — | 1 |
| Altice Studio | — | — | — | 1 |
| Alvernia Studios | Poland | — | — | 1 |
| AM Television | India | 2012 | — | 1 |
| Amaco Investments | Nigeria | — | — | 1 |
| Amaru Entertainment | United States | 1997 | — | 1 |
| Amateru | Italy | 2018 | — | 1 |
| Amazon | United States | July 5, 1994 | — | 1 |
| Ambassador Theatres | Taiwan | 2001 | — | 1 |
| Amber Films | — | 1968 | — | 1 |
| Ambient Entertainment | Germany | October 11, 1999 | — | 1 |
| Amblin Television | United States | July 31, 1984 | — | 1 |
| AMC Networks International Southern Europe | Spain | July 8, 2014 | — | 1 |
| American Broadcasting-Paramount Theatres, Inc. | — | November 15, 1949 | July 24, 1989 | 1 |
| American Society of Civil Engineers | United States | 1852 | — | 1 |
| AMOS Pictures | United Kingdom | — | — | 1 |
| Anatman Films | Indonesia | — | — | 1 |
| Andell Holdings | — | — | — | 1 |
| Andscape | United States | — | — | 1 |
| Angel Digital Pvt Ltd | India | — | — | 1 |
| Angel Films | Denmark | 1988 | — | 1 |
| Angel Films | Finland | August 11, 2009 | — | 1 |
| Anhui Television | People's Republic of China | September 30, 1960 | — | 1 |
| Animafilm | Romania | 1964 | — | 1 |
| Animal Planet | United States | October 1996 | — | 1 |
| Animation Digital Network | France | September 2013 | — | 1 |
| Animax Entertainment | United States | October 26, 2001 | — | 1 |
| Animoon | Poland | — | — | 1 |
| Aniplex | Japan | September 1995 | — | 1 |
| Anita Stewart Productions | United States | 1917 | 1922 | 1 |
| Anka Film | Turkey | — | — | 1 |
| Annapurna Animation | — | December 2022 | — | 1 |
| Anosi | Greece | October 1987 | — | 1 |
| ANS TV | Azerbaijan | 1991 | July 18, 2016 | 1 |
| Antelope | United Kingdom | — | — | 1 |
| Anthology Studios | South Korea | November 17, 2020 | — | 1 |
| Antidote Films | — | — | — | 1 |
| AP Films | United Kingdom | 1957 | 1966 | 1 |
| Apocalypso Pictures | Poland | — | — | 1 |
| Apologetics Press | United States | 1979 | — | 1 |
| Appian Way | Italy | 311 BC | — | 1 |
| Apple Film Production | Poland | 1990 | — | 1 |
| Apple TV | United States | November 2019 | — | 1 |
| Applecross peninsula | United Kingdom | — | — | 1 |
| AQS | Czech Republic | March 27, 1998 | — | 1 |
| Aquarius Films | Australia | — | — | 1 |
| Arad Productions Inc. | United States | — | — | 1 |
| Aragón TV | Spain | 2006 | — | 1 |
| Arc Media | South Korea | — | — | 1 |
| Arca-Winston Films Corp. | Germany | — | — | 1 |
| Arcadia | Estonia | — | — | 1 |
| Arcana Studio | Canada | 2004 | — | 1 |
| Arcapix | France | — | — | 1 |
| Archaia Entertainment | United States | 2002 | — | 1 |
| Archant | — | 1845 | — | 1 |
| Archdiocese of Caceres | Philippines | June 29, 1951 | — | 1 |
| Archer Street | United Kingdom | — | — | 1 |
| Archie Comics | United States | 1939 | — | 1 |
| Arclight Films | Australia | 2002 | — | 1 |
| Arctandriafilm | Norway | — | — | 1 |
| Argo Pictures | Japan | February 14, 1990 | — | 1 |