The New York Stock Exchange said an outage of more than three hours was caused by problems associated with a software upgrade on the exchange's computers.
The problem became severe enough by late morning Wednesday that the exchange decided to suspend trading at 11:32 a.m. Eastern time so the problem could be addressed. Orders were cancelled, trading software was restarted and backup units were brought online, the exchange said.
The exchange restarted trading at 3:10 p.m. Eastern.
Wednesday's shutdown was a black eye for the NYSE, but ultimately it did not broadly impact Wednesday's trading. The