That is 100% not what happened. How can a company be independent if they were forced to do pubic works and used POW's and concentration camp workers? Bayer was their major pharma company and they employed slave labor. How could any company employ slave labor and stay independent. If they were forced to slave labor by the NAZI's, then they were not independent capitalist corporations, but socialist run organizations used for the war effort.
Here is a blurb from the Bayer site:
https://www.bayer.com/en/1925-1945.aspx
World War II Approaches
In 1936 the National Socialist government began systematically preparing for war.
When the Second World War finally broke out in 1939, the locations of the Lower Rhine consortium were among the sites of German industry that were considered "vital to the war." Production requirements grew steadily, yet more and more employees were drafted into military service. For this reason, foreign and forced laborers from the occupied countries of Europe were brought to work in Leverkusen, Dormagen, Elberfeld and Uerdingen – and throughout the German industry as a whole – to maintain output levels. At times during the war, these laborers accounted for up to one third of the workforce. Concentration camp prisoners were not employed in the Lower Rhine sites.
For the Leverkusen site, the war ended on April 14, 1945, with the arrival of American troops. As Leverkusen was located in the British occupation zone, the British military government soon assumed complete control over the Lower Rhine sites.
Read this article that does a nice job of covering the NAZI and how they managed industry. They refer to it "socialist"
https://www.adl.org/news/op-ed/german-businesses-and-nazis