Greenwich Litho Company was started in the early 20th century.

Tooker Litho Co. produced movie posters in New York City. They were bought by Morgan Litho in the 1930s, but were eventually able to break away and run as a seperate company again.

Ritchey Litho Co. produced movie posters from the early teens to 1920s. They were based in New York and made posters for some of the smaller movie studios.

H. C. Miner Litho Company started in New York in 1896. The company lasted until 1935.

Otis Litho Company operated in Cleveland, Ohio in the early 20th century.

Morgan Litho Company was started by William J. Morgan and George William Morgan in 1886 and was one of the largest movie poster distributors until the NSS came along.

Metro Litho was started in the early 1900s and primarily produced posters for All Star Feature Corp.

Acme Litho operated in the early 20th century, printing movie posters for primarily Pathe Company.

Lithographers are the people who actually make the plates that are used to print movie posters.