Porsche heaquarters was raided by German investigators Thursday due to suspicions of insider trading by former CEO Wendelin Wiedeking, who was ousted last month following an epic takeover battle in which the luxury carmaker almost swallowed Volkswagen─Europe's largest carmaker, which is more than 10 times Porsche's size─before VW turned the tables. It is now set to gobble up Porsche instead. In trying to buy up Volkswagen, Wiedeking had accumulated 43 percent of VW's shares but secretly held options on another 32 percent. Porsche did not disclose the options until October 2008, roiling the markets. The company said yesterday that the...