FedEx joined snack-maker Mondelez among firms warning that the late-June hacks will affect their numbers.
Risk-off trading prevails.
Reckitt Benckiser said Wednesday it had fallen victim to the Petya ransomware virus, adding its name to a list of companies including AP Moerller-Maersk and advertising agency WPP.
Maersk said Wednesday that it has contained the Petya ransomware virus that shut down some of its systems in an ongoing global cyber attack.
A computer virus that locks up computers and seeks ransom payments has spread to the U.S.