| Aetios Productions | Saint-Sauveur | — | 1 |
| AFI Conservatory | — | 1969 | 1 |
| After the Wedding | — | — | 1 |
| Agitator | — | — | 1 |
| Ahotsa.info | — | 2014 | 1 |
| Aim Rain Limited | Middlesex | May 21, 1993 | 1 |
| AKOM | Seoul | 1985 | 1 |
| Al Jazeera Balkans | Sarajevo | 2011 | 1 |
| Al Jazeera Documentary Channel | — | 2007 | 1 |
| Ala Bianca Group S.r.l. | Modena | 1990 | 1 |
| Alan Landsburg Productions | — | 1971 | 1 |
| Alatas Films | — | — | 1 |
| Albanian General Vision | — | — | 1 |
| Albert Bonniers Förlag | Stockholm | 1837 | 1 |
| Aldo, Giovanni & Giacomo | — | — | 1 |
| ALEF Film & Media Group | Bratislava | 1997 | 1 |
| Alert film | Oslo Municipality | — | 1 |
| Alexander Nanau Production | — | — | 1 |
| Alfa Pictures | Barcelona | — | 1 |
| Algefa | Berlin | 1936 | 1 |
| Alien Films Entertainment | — | — | 1 |
| All Things Comedy | Los Angeles | October 2012 | 1 |
| All Yours Film | — | — | 1 |
| Allarts | — | — | 1 |
| AllMusic | — | 1991 | 1 |
| Allspark Pictures | Burbank | May 2008 | 1 |
| Alpha Films | — | — | 1 |
| Alpha-i | Banani (neighbourhood) | — | 1 |
| Alquimia Cinema | Madrid | — | 1 |
| Alta Vista | — | — | 1 |
| Alvernia Studios | — | — | 1 |
| AM Television | — | 2012 | 1 |
| Amaco Investments | — | — | 1 |
| Amaru Entertainment | Atlanta | 1997 | 1 |
| Amazon | Seattle | July 5, 1994 | 1 |
| Amber Films | — | 1968 | 1 |
| Ambient Entertainment | Hanover | October 11, 1999 | 1 |
| American Broadcasting-Paramount Theatres, Inc. | 1501 Broadway | November 15, 1949 | 1 |
| American Society of Civil Engineers | Reston | 1852 | 1 |
| AMOS Pictures | — | — | 1 |
| Anatman Films | — | — | 1 |
| Andscape | — | — | 1 |
| Angel Digital Pvt Ltd | — | — | 1 |
| Animafilm | Sector 3 | 1964 | 1 |
| Animal Planet | Silver Spring | October 1996 | 1 |
| Animoon | — | — | 1 |
| Aniplex | Rokubanchō | September 1995 | 1 |
| Antidote Films | New York City | — | 1 |