After World War II, the automobile factory of Saxony Automobile Union was confiscated and demolished by the former Soviet occupation forces. Since then, many senior executives of the company have gone to Bavaria, and in 1949, auto union gmbh was established in ingolstadt, Ingall. This company inherited the tradition of the old automobile alliance and is still marked by four chain stores.

Automobile Union Co., Ltd. and nsu GmbH merged in 1969 to form Audi NSU Auto Union AG 1985. The company was renamed Audi AG and its headquarters moved to Ingolstadt. The logo of the Fourth Ring Road has been in use ever since.

It can be seen that Audi's history was divided into two parts by World War II. The first part is the automobile alliance before World War II, and the second part is the development of Audi after World War II.