NEW YORK--(BUSINESS WIRE)--TheGrantLawFirm, PLLC (the “GrantFirm”) has commenced an investigation into a potential Federal securities class action against Volkswagen AG (“Volkswagen” or the “Company”) on behalf of purchasers of Volkswagen U.S. traded ADRs (OTC: VLKAY) and preferred ADRs (VLKPY). The securities plunged by almost 20% after it was announced that Volkswagen had installed "defeat devices" on many of its most recent diesel car models. According to the EPA, Volkswagen used a device pr