| Period | Extant adverts with studio plug | |
| Major studios: | ||
| Paramount | 1931–1951 | 53 |
| Warner Bros | 1928–1950 | 34 |
| Fox | 1931–1951 | 29 |
| MGM | 1930–1951 | 28 |
| RKO | 1931–1937 | 21 |
| Columbia | 1931–1951 | 19 |
| United Artists | 1931–1949 | 18 |
| Universal | 1931–1951 | 13 |
| Major studios total | 215 | |
| Smaller studios | 19 | |
| Hollywood testimonial adverts without explicit studio plugs | 64 |
Smaller studios include David O Selznick, Enterprise, Eagle-Lion, First National, Pathé, Samuel Goldwyn, Santana and Radio Pictures. Total number of adverts containing studio plugs is a conservative estimate based on surviving records. An advertisement was counted if the studio name appeared in print or was mentioned on a tobacco company-sponsored radio program during the guest appearance of the Hollywood endorser.