Winterkorn steps down as CEO of Porsche Holding, VW's biggest shareholder

#hashtags: #Volkswagen AG #Martin Winterkorn #Porsche Automobil Holding

Volkswagen AG's former CEO, Martin Winterkorn, will step down from his post running Porsche Automobil Holding, VW's biggest shareholder, succumbing to pressure to cut his ties amid an investigation into cheating on emissions tests.