A U.S. Department of Homeland Security official, who spoke on condition of anonymity, said there was no indication so far that the NYSE had been hacked.
While the halt recalled the August 2013 outage in Nasdaq- listed securities, when a broken price feed forced the exchange to stop trading in more than 2,000 listings for several hours, its immediate impact was not as great because trading continues today on other venues. That event caused SEC Chair Mary Jo White to call the heads of all the public equities exchanges to stress the importance of stability in U.S. markets.