During the period that FZ was owned by the Imprimatur, the prestigious newspaper was in financial distress situations and brought the company heavy losses.
Six years later, Bosch sold his shares, leaving Hummel as the sole shareholder of the Imprimatur.
The company was later sold to the prominent banking family of Leopold Sonnemann.
Although the paper was initially protected by the Nazis, as it provided a convenient medium for propaganda, it was shut down by Adolf Hitler in 1943.
In 1930, Hermann Hummel took over all the shares in Imprimatur GmbH and Carl Bosch was thus able to support the Frankfurter Zeitung with financial resources without being directly involved.