According to The Wall Street Journal, U.S. stock exchanges on Thursday just halted trading in all securities listed on NASDAQ because of a technical issue, exchange officials said.
NASDAQ announced the halt at 12:15 p.m. ET Thursday, and other exchanges followed suit. Nasdaq also said it was halting trade in its options markets. Notices of halts in individual securities started to cross the wire at about 12:18 p.m.
The issue stemmed from a data feed that provides market data for Nasdaq-listed securities, the exchanges said in notices sent to traders. According to Edgar Perez, author, Knightmare on Wall Street, if there are no data feeds available for market participants, trading can’t happen.