Aidan O'Leary

When WannaCry overwhelmed more than 200,000 computers in 150 countries last Friday, global businesses stalled. Companies from PetroChina Company Limited (ADR) (NYSE: PTR) and FedEx Corporation (NYSE: FDX) to Nissan Motor Co Ltd (ADR) (OTC: NSANY) and Telefonica S.A. (ADR) (NYSE: TEF) suffered...