Auto Union
After being merged with Neckarsulm car maker NSU, the official name became Audi NSU Auto Union AG, which was simply shortened to Audi AG in 1985, ending both the Auto Union and NSU brands. The company's headquarters returned to Ingolstadt; at the same time Audi formed the new companies Auto Union GmbH, and NSU GmbH as wholly owned subsidiaries whose function was to own and protect the historical trademarks and intellectual property of both Auto Union and NSU.