A few weeks after August Thyssen's death on April 4, 1926, large parts of the Thyssen group are transferred to Vereinigte Stahlwerke AG. His son Fritz Thyssen is appointed supervisory board chairman of the new group. Thyssen's share of the newly established Vereinigte Stahlwerke AG is valued at 26% of the nominal share capital of 800 million reichsmarks.
August Thyssen-Hütte AG is founded in 1934 as an operating company of Vereinigte Stahlwerke AG. It is a horizontally integrated enterprise comprising the five iron and steelworks of Vereinigte Stahlwerke AG in the Duisburg area and focuses on the production of sectional steel and semi-finished products. Under the National Socialist rearmament policy, these plants are an important supplier of preliminary products for the subsequent war economy. On allied orders, the company is liquidated after the war, and in 1953 a new August Thyssen-Hütte AG is established in Duisburg with the sole purpose of putting the largely dismantled Thyssen iron and steelworks back into operation. The other Duisburg-based iron and steel mills of Vereinigte Stahlwerke AG initially go it alone as legally independent companies before returning to the Thyssen group in the 1950s and 1960s. Only the Thyssen mining company transferred to Vereinigte Stahlwerke AG in 1926 does not return to the old group.