A member of the NSDAP (National Socialist German Workers' Party) since 1933, Stock was anti-Semitic. From February 6, 1936, to May 7, 1938 Stock was the president of the German Chemical Society. Bombs in the Second World War damaged the house of Stock. In September 1943 he and his wife moved to Bad Warmbrunn in Silesia, but the flow of refugees forced them to move again towards west in February 1945. They found accommodation in Aken (near Dessau). After the war in 1946, Stock endeavoured to revitalize the German chemistry by lectures and memoirs. He was renowned for his pioneering research on boron hydrides.