Eight Hollywood studios in their studio era in their "golden ages" from the late 1920s to 1949 (although the Little Three flourished after this supposed golden age), the latter chosen as one year after the Supreme Court ruled against studios and their practices in US v Paramount Pictures, LLC. To see more of the films as part of the decline of the Studio Era, check out the individual lists below.
The Big Five : Fox Film Corporation / 20th Century Fox | Metro-Goldwyn-Mayer | Paramount Pictures | RKO (Radio) Pictures | Warner Bros
The Little Three : Columbia Pictures | United Artists | Universal Pictures
& don't forget Poverty Row Studios